* [BUG] local_softirq_pending storm
@ 2007-05-09 14:12 Anant Nitya
2007-05-09 16:31 ` Thomas Gleixner
0 siblings, 1 reply; 27+ messages in thread
From: Anant Nitya @ 2007-05-09 14:12 UTC (permalink / raw)
To: linux-kernel
Hi,
Ever since I upgrade to 2.6.21/.1, system log is filled with following
messages if I enable CONFIG_NO_HZ=y, going through archives it seems ingo
sometime back posted some patch and now it is upstream, but its not helping
here. If I disable NOHZ by kernel command line nohz=off this problem
disappears. This system is P4/2.40GHz/HT with SMP/SMT on in kernel config.
One more thing that I noticed is this problem only arises while using X or
network otherwise plain command line with no network access don't trigger
this with nohz=on.
Please ask if more information is required regarding this setup.
dumdum@hahakaar [~]$ >> grep NOHZ /var/log/messages
May 8 03:38:14 rudra kernel: [ 419.271195] NOHZ: local_softirq_pending 02
May 8 03:38:14 rudra kernel: [ 419.271663] NOHZ: local_softirq_pending 02
May 8 03:38:14 rudra kernel: [ 419.343948] NOHZ: local_softirq_pending 22
May 8 03:38:14 rudra kernel: [ 419.344236] NOHZ: local_softirq_pending 22
May 8 03:38:14 rudra kernel: [ 419.344397] NOHZ: local_softirq_pending 22
May 8 03:38:14 rudra kernel: [ 419.344545] NOHZ: local_softirq_pending 22
May 8 03:38:14 rudra kernel: [ 419.344691] NOHZ: local_softirq_pending 22
May 8 03:38:14 rudra kernel: [ 419.344842] NOHZ: local_softirq_pending 22
May 8 03:38:14 rudra kernel: [ 419.344991] NOHZ: local_softirq_pending 22
May 8 03:38:14 rudra kernel: [ 419.345137] NOHZ: local_softirq_pending 22
May 8 03:38:18 rudra kernel: [ 423.065780] NOHZ: local_softirq_pending 22
May 8 03:38:18 rudra kernel: [ 423.066206] NOHZ: local_softirq_pending 22
May 8 03:38:18 rudra kernel: [ 423.066509] NOHZ: local_softirq_pending 22
May 8 03:38:19 rudra kernel: [ 424.006549] NOHZ: local_softirq_pending 22
May 8 03:38:19 rudra kernel: [ 424.006983] NOHZ: local_softirq_pending 22
May 8 03:38:19 rudra kernel: [ 424.007239] NOHZ: local_softirq_pending 22
May 8 03:38:19 rudra kernel: [ 424.007473] NOHZ: local_softirq_pending 22
May 8 03:38:19 rudra kernel: [ 424.007706] NOHZ: local_softirq_pending 22
May 8 03:38:19 rudra kernel: [ 424.007941] NOHZ: local_softirq_pending 22
May 8 03:38:22 rudra kernel: [ 426.862456] NOHZ: local_softirq_pending 22
May 8 03:38:23 rudra kernel: [ 428.331619] NOHZ: local_softirq_pending 22
May 8 03:38:23 rudra kernel: [ 428.331991] NOHZ: local_softirq_pending 22
May 8 03:38:23 rudra kernel: [ 428.332192] NOHZ: local_softirq_pending 22
May 8 03:38:23 rudra kernel: [ 428.332378] NOHZ: local_softirq_pending 22
May 8 03:38:23 rudra kernel: [ 428.332553] NOHZ: local_softirq_pending 22
May 8 03:38:23 rudra kernel: [ 428.332740] NOHZ: local_softirq_pending 22
May 8 03:38:23 rudra kernel: [ 428.332914] NOHZ: local_softirq_pending 22
May 8 03:38:23 rudra kernel: [ 428.333097] NOHZ: local_softirq_pending 22
May 8 03:38:23 rudra kernel: [ 428.333271] NOHZ: local_softirq_pending 22
May 8 03:38:23 rudra kernel: [ 428.333443] NOHZ: local_softirq_pending 22
May 8 03:38:23 rudra kernel: [ 428.333619] NOHZ: local_softirq_pending 22
May 8 03:38:24 rudra kernel: [ 429.261574] NOHZ: local_softirq_pending 22
May 8 03:38:24 rudra kernel: [ 429.262024] NOHZ: local_softirq_pending 22
May 8 03:38:24 rudra kernel: [ 429.262339] NOHZ: local_softirq_pending 22
May 8 03:38:24 rudra kernel: [ 429.262610] NOHZ: local_softirq_pending 22
May 8 03:38:24 rudra kernel: [ 429.262847] NOHZ: local_softirq_pending 22
May 8 03:38:24 rudra kernel: [ 429.263081] NOHZ: local_softirq_pending 22
May 8 03:38:35 rudra kernel: [ 440.182998] NOHZ: local_softirq_pending 22
May 8 03:38:35 rudra kernel: [ 440.183408] NOHZ: local_softirq_pending 22
May 8 03:38:35 rudra kernel: [ 440.183661] NOHZ: local_softirq_pending 22
May 8 03:38:43 rudra kernel: [ 448.272087] NOHZ: local_softirq_pending 22
May 8 03:38:43 rudra kernel: [ 448.272529] NOHZ: local_softirq_pending 22
May 8 03:38:44 rudra kernel: [ 449.223360] NOHZ: local_softirq_pending 22
May 8 03:38:44 rudra kernel: [ 449.223887] NOHZ: local_softirq_pending 22
May 8 03:38:44 rudra kernel: [ 449.224570] NOHZ: local_softirq_pending 22
May 8 03:38:44 rudra kernel: [ 449.225066] NOHZ: local_softirq_pending 22
May 8 03:38:44 rudra kernel: [ 449.232989] NOHZ: local_softirq_pending 22
May 8 03:38:47 rudra kernel: [ 452.178583] NOHZ: local_softirq_pending a2
May 8 03:38:47 rudra kernel: [ 452.179017] NOHZ: local_softirq_pending a2
May 8 03:38:47 rudra kernel: [ 452.179257] NOHZ: local_softirq_pending a2
May 8 03:38:51 rudra kernel: [ 455.957968] NOHZ: local_softirq_pending 22
May 8 03:38:51 rudra kernel: [ 455.958462] NOHZ: local_softirq_pending 22
May 8 03:38:51 rudra kernel: [ 455.958741] NOHZ: local_softirq_pending 22
May 8 03:38:51 rudra kernel: [ 455.958984] NOHZ: local_softirq_pending 22
May 8 03:38:51 rudra kernel: [ 455.959292] NOHZ: local_softirq_pending 22
May 8 03:38:51 rudra kernel: [ 455.959540] NOHZ: local_softirq_pending 22
May 8 03:38:51 rudra kernel: [ 455.959774] NOHZ: local_softirq_pending 22
May 8 03:38:51 rudra kernel: [ 455.960005] NOHZ: local_softirq_pending 22
May 8 03:38:51 rudra kernel: [ 455.972368] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.972681] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.972884] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.973069] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.973251] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.973433] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.973631] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.973832] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.974018] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.974234] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.974422] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.974610] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.974791] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.974981] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.975194] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.975390] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.975570] NOHZ: local_softirq_pending 10
May 8 03:38:51 rudra kernel: [ 455.976091] NOHZ: local_softirq_pending 22
May 8 03:38:51 rudra kernel: [ 455.976376] NOHZ: local_softirq_pending 22
May 8 03:38:51 rudra kernel: [ 455.976622] NOHZ: local_softirq_pending 22
May 8 03:38:51 rudra kernel: [ 455.976862] NOHZ: local_softirq_pending 22
May 8 03:38:51 rudra kernel: [ 455.977099] NOHZ: local_softirq_pending 22
May 8 03:38:51 rudra kernel: [ 455.977337] NOHZ: local_softirq_pending 22
May 8 03:38:51 rudra kernel: [ 455.977577] NOHZ: local_softirq_pending 22
May 8 03:38:51 rudra kernel: [ 455.977815] NOHZ: local_softirq_pending 22
May 8 03:38:52 rudra kernel: [ 456.848267] NOHZ: local_softirq_pending 22
May 8 03:38:52 rudra kernel: [ 456.848726] NOHZ: local_softirq_pending 22
May 8 03:38:52 rudra kernel: [ 456.848982] NOHZ: local_softirq_pending 22
May 8 03:38:52 rudra kernel: [ 456.849223] NOHZ: local_softirq_pending 22
May 8 03:38:52 rudra kernel: [ 456.849459] NOHZ: local_softirq_pending 22
May 8 03:38:54 rudra kernel: [ 459.279942] NOHZ: local_softirq_pending 02
May 8 03:38:54 rudra kernel: [ 459.280267] NOHZ: local_softirq_pending 02
May 8 03:38:54 rudra kernel: [ 459.280477] NOHZ: local_softirq_pending 02
May 8 03:38:54 rudra kernel: [ 459.280667] NOHZ: local_softirq_pending 02
May 8 03:38:54 rudra kernel: [ 459.280865] NOHZ: local_softirq_pending 02
May 8 03:38:59 rudra kernel: [ 464.046556] NOHZ: local_softirq_pending 22
May 8 03:38:59 rudra kernel: [ 464.046999] NOHZ: local_softirq_pending 22
May 8 03:38:59 rudra kernel: [ 464.047315] NOHZ: local_softirq_pending 22
May 8 03:38:59 rudra kernel: [ 464.047554] NOHZ: local_softirq_pending 22
May 8 03:38:59 rudra kernel: [ 464.047790] NOHZ: local_softirq_pending 22
May 8 03:39:08 rudra kernel: [ 473.019484] NOHZ: local_softirq_pending a2
May 8 03:39:08 rudra kernel: [ 473.019954] NOHZ: local_softirq_pending a2
May 8 03:39:08 rudra kernel: [ 473.020215] NOHZ: local_softirq_pending a2
May 8 03:39:08 rudra kernel: [ 473.020455] NOHZ: local_softirq_pending a2
May 8 03:39:08 rudra kernel: [ 473.020692] NOHZ: local_softirq_pending a2
May 8 03:39:08 rudra kernel: [ 473.020925] NOHZ: local_softirq_pending a2
May 8 03:39:11 rudra kernel: [ 475.876271] NOHZ: local_softirq_pending 22
May 8 03:39:11 rudra kernel: [ 475.876697] NOHZ: local_softirq_pending 22
May 8 03:39:11 rudra kernel: [ 475.876947] NOHZ: local_softirq_pending 22
May 8 03:39:11 rudra kernel: [ 475.877183] NOHZ: local_softirq_pending 22
May 8 03:39:11 rudra kernel: [ 475.877490] NOHZ: local_softirq_pending 22
May 8 03:39:11 rudra kernel: [ 475.877736] NOHZ: local_softirq_pending 22
May 8 03:39:11 rudra kernel: [ 475.877964] NOHZ: local_softirq_pending 22
May 8 03:39:31 rudra kernel: [ 495.878914] NOHZ: local_softirq_pending 22
May 8 03:39:31 rudra kernel: [ 495.879262] NOHZ: local_softirq_pending 22
May 8 03:39:31 rudra kernel: [ 495.879473] NOHZ: local_softirq_pending 22
May 8 03:39:31 rudra kernel: [ 495.879674] NOHZ: local_softirq_pending 22
May 8 03:39:31 rudra kernel: [ 495.879849] NOHZ: local_softirq_pending 22
May 8 03:39:31 rudra kernel: [ 495.880031] NOHZ: local_softirq_pending 22
May 8 03:39:31 rudra kernel: [ 495.880206] NOHZ: local_softirq_pending 22
May 8 03:39:53 rudra kernel: [ 517.755212] NOHZ: local_softirq_pending 22
May 8 03:39:53 rudra kernel: [ 517.755863] NOHZ: local_softirq_pending 22
May 8 03:39:53 rudra kernel: [ 517.756181] NOHZ: local_softirq_pending 22
May 8 03:39:53 rudra kernel: [ 517.756434] NOHZ: local_softirq_pending 22
May 8 03:39:53 rudra kernel: [ 517.756667] NOHZ: local_softirq_pending 22
May 8 03:39:53 rudra kernel: [ 517.756900] NOHZ: local_softirq_pending 22
May 8 03:39:54 rudra kernel: [ 518.718220] NOHZ: local_softirq_pending 22
May 8 03:39:54 rudra kernel: [ 518.718540] NOHZ: local_softirq_pending 22
May 8 03:39:54 rudra kernel: [ 518.718756] NOHZ: local_softirq_pending 22
May 8 03:39:54 rudra kernel: [ 518.718944] NOHZ: local_softirq_pending 22
May 8 03:39:54 rudra kernel: [ 518.719121] NOHZ: local_softirq_pending 22
May 8 03:39:54 rudra kernel: [ 518.719298] NOHZ: local_softirq_pending 22
May 8 03:39:54 rudra kernel: [ 518.719484] NOHZ: local_softirq_pending 22
May 8 03:39:54 rudra kernel: [ 518.719672] NOHZ: local_softirq_pending 22
May 8 03:40:02 rudra kernel: [ 526.814840] NOHZ: local_softirq_pending 22
May 8 03:40:02 rudra kernel: [ 526.815354] NOHZ: local_softirq_pending 22
May 8 03:40:02 rudra kernel: [ 526.815703] NOHZ: local_softirq_pending 22
May 8 03:40:02 rudra kernel: [ 526.816015] NOHZ: local_softirq_pending 22
May 8 03:40:02 rudra kernel: [ 526.816255] NOHZ: local_softirq_pending 22
May 8 03:40:11 rudra kernel: [ 535.847890] NOHZ: local_softirq_pending a2
May 8 03:40:11 rudra kernel: [ 535.848360] NOHZ: local_softirq_pending a2
May 8 03:40:11 rudra kernel: [ 535.848618] NOHZ: local_softirq_pending a2
May 8 03:40:11 rudra kernel: [ 535.848857] NOHZ: local_softirq_pending a2
May 8 03:40:11 rudra kernel: [ 535.849095] NOHZ: local_softirq_pending a2
May 8 03:40:12 rudra kernel: [ 536.788182] NOHZ: local_softirq_pending 22
May 8 03:40:12 rudra kernel: [ 536.788630] NOHZ: local_softirq_pending 22
May 8 03:40:12 rudra kernel: [ 536.788939] NOHZ: local_softirq_pending 22
May 8 03:40:12 rudra kernel: [ 536.789240] NOHZ: local_softirq_pending 22
May 8 03:40:12 rudra kernel: [ 536.789484] NOHZ: local_softirq_pending 22
May 8 03:40:12 rudra kernel: [ 536.789718] NOHZ: local_softirq_pending 22
May 8 03:40:16 rudra kernel: [ 541.078474] NOHZ: local_softirq_pending a2
May 8 03:40:16 rudra kernel: [ 541.078933] NOHZ: local_softirq_pending a2
May 8 03:40:16 rudra kernel: [ 541.079186] NOHZ: local_softirq_pending a2
May 8 03:40:16 rudra kernel: [ 541.079425] NOHZ: local_softirq_pending a2
May 8 03:40:16 rudra kernel: [ 541.079657] NOHZ: local_softirq_pending a2
May 8 03:40:16 rudra kernel: [ 541.079893] NOHZ: local_softirq_pending a2
May 8 03:40:18 rudra kernel: [ 542.974969] NOHZ: local_softirq_pending 22
May 8 03:40:18 rudra kernel: [ 542.975419] NOHZ: local_softirq_pending 22
May 8 03:40:18 rudra kernel: [ 542.975754] NOHZ: local_softirq_pending 22
May 8 03:40:18 rudra kernel: [ 542.976018] NOHZ: local_softirq_pending 22
May 8 03:40:18 rudra kernel: [ 542.976253] NOHZ: local_softirq_pending 22
May 8 03:40:18 rudra kernel: [ 542.976484] NOHZ: local_softirq_pending 22
May 8 03:40:24 rudra kernel: [ 548.687200] NOHZ: local_softirq_pending a2
May 8 03:40:24 rudra kernel: [ 548.687691] NOHZ: local_softirq_pending a2
May 8 03:40:28 rudra kernel: [ 552.977399] NOHZ: local_softirq_pending a2
May 8 03:40:28 rudra kernel: [ 552.977730] NOHZ: local_softirq_pending a2
May 8 03:40:28 rudra kernel: [ 552.977946] NOHZ: local_softirq_pending a2
May 8 03:40:28 rudra kernel: [ 552.978135] NOHZ: local_softirq_pending a2
May 8 03:40:28 rudra kernel: [ 552.978318] NOHZ: local_softirq_pending a2
May 8 03:40:28 rudra kernel: [ 552.978499] NOHZ: local_softirq_pending a2
May 8 03:40:28 rudra kernel: [ 552.978708] NOHZ: local_softirq_pending a2
May 8 03:40:33 rudra kernel: [ 557.728762] NOHZ: local_softirq_pending 22
May 8 03:40:33 rudra kernel: [ 557.729230] NOHZ: local_softirq_pending 22
May 8 03:40:33 rudra kernel: [ 557.729539] NOHZ: local_softirq_pending 22
May 8 03:40:33 rudra kernel: [ 557.729821] NOHZ: local_softirq_pending 22
May 8 03:40:33 rudra kernel: [ 557.730060] NOHZ: local_softirq_pending 22
May 8 03:40:33 rudra kernel: [ 557.730297] NOHZ: local_softirq_pending 22
May 8 03:40:36 rudra kernel: [ 561.065192] NOHZ: local_softirq_pending e2
May 8 03:40:36 rudra kernel: [ 561.065539] NOHZ: local_softirq_pending e2
May 8 03:40:36 rudra kernel: [ 561.065750] NOHZ: local_softirq_pending e2
May 8 03:40:36 rudra kernel: [ 561.065942] NOHZ: local_softirq_pending e2
May 8 03:40:36 rudra kernel: [ 561.066139] NOHZ: local_softirq_pending e2
May 8 03:40:36 rudra kernel: [ 561.066339] NOHZ: local_softirq_pending e2
May 8 03:40:36 rudra kernel: [ 561.066515] NOHZ: local_softirq_pending e2
May 8 03:40:42 rudra kernel: [ 566.772651] NOHZ: local_softirq_pending 22
May 8 03:40:42 rudra kernel: [ 566.773108] NOHZ: local_softirq_pending 22
May 8 03:40:42 rudra kernel: [ 566.773314] NOHZ: local_softirq_pending 22
May 8 03:40:42 rudra kernel: [ 566.773359] NOHZ: local_softirq_pending 22
May 8 03:40:42 rudra kernel: [ 566.787249] NOHZ: local_softirq_pending 62
May 8 03:40:42 rudra kernel: [ 566.787536] NOHZ: local_softirq_pending 62
May 8 03:40:51 rudra kernel: [ 575.816602] NOHZ: local_softirq_pending 22
May 8 03:40:51 rudra kernel: [ 575.817065] NOHZ: local_softirq_pending 22
May 8 03:41:03 rudra kernel: [ 587.715470] NOHZ: local_softirq_pending 22
May 8 03:41:03 rudra kernel: [ 587.715920] NOHZ: local_softirq_pending 22
May 8 03:41:03 rudra kernel: [ 587.716259] NOHZ: local_softirq_pending 22
May 8 03:41:03 rudra kernel: [ 587.716528] NOHZ: local_softirq_pending 22
May 8 03:41:03 rudra kernel: [ 587.716764] NOHZ: local_softirq_pending 22
May 8 03:41:03 rudra kernel: [ 587.717001] NOHZ: local_softirq_pending 22
May 8 03:41:12 rudra kernel: [ 596.805445] NOHZ: local_softirq_pending 22
May 8 03:41:12 rudra kernel: [ 596.805945] NOHZ: local_softirq_pending 22
May 8 03:41:12 rudra kernel: [ 596.806196] NOHZ: local_softirq_pending 22
May 8 03:41:12 rudra kernel: [ 596.806430] NOHZ: local_softirq_pending 22
May 8 03:41:12 rudra kernel: [ 596.806659] NOHZ: local_softirq_pending 22
May 8 03:41:12 rudra kernel: [ 596.806888] NOHZ: local_softirq_pending 22
May 8 03:41:12 rudra kernel: [ 596.807116] NOHZ: local_softirq_pending 22
May 8 03:41:12 rudra kernel: [ 596.807341] NOHZ: local_softirq_pending 22
May 8 03:41:12 rudra kernel: [ 596.807570] NOHZ: local_softirq_pending 22
May 8 03:41:20 rudra kernel: [ 604.847182] NOHZ: local_softirq_pending 22
May 8 03:41:20 rudra kernel: [ 604.847637] NOHZ: local_softirq_pending 22
May 8 03:41:20 rudra kernel: [ 604.847941] NOHZ: local_softirq_pending 22
May 8 03:41:20 rudra kernel: [ 604.848225] NOHZ: local_softirq_pending 22
May 8 03:41:20 rudra kernel: [ 604.848463] NOHZ: local_softirq_pending 22
May 8 03:41:20 rudra kernel: [ 604.848700] NOHZ: local_softirq_pending 22
May 8 03:41:23 rudra kernel: [ 607.702270] NOHZ: local_softirq_pending 22
May 8 03:41:23 rudra kernel: [ 607.702604] NOHZ: local_softirq_pending 22
May 8 03:41:23 rudra kernel: [ 607.702804] NOHZ: local_softirq_pending 22
May 8 03:41:23 rudra kernel: [ 607.702982] NOHZ: local_softirq_pending 22
May 8 03:41:23 rudra kernel: [ 607.703181] NOHZ: local_softirq_pending 22
May 8 03:41:23 rudra kernel: [ 607.703431] NOHZ: local_softirq_pending 22
May 8 03:41:23 rudra kernel: [ 607.703621] NOHZ: local_softirq_pending 22
May 8 03:41:29 rudra kernel: [ 613.888941] NOHZ: local_softirq_pending 22
May 8 03:41:29 rudra kernel: [ 613.889415] NOHZ: local_softirq_pending 22
May 8 03:41:29 rudra kernel: [ 613.889712] NOHZ: local_softirq_pending 22
May 8 03:41:29 rudra kernel: [ 613.890009] NOHZ: local_softirq_pending 22
May 8 03:41:29 rudra kernel: [ 613.890251] NOHZ: local_softirq_pending 22
May 8 03:41:29 rudra kernel: [ 613.890487] NOHZ: local_softirq_pending 22
May 8 03:41:32 rudra kernel: [ 616.743862] NOHZ: local_softirq_pending 22
May 8 03:41:32 rudra kernel: [ 616.744331] NOHZ: local_softirq_pending 22
May 8 03:41:32 rudra kernel: [ 616.744640] NOHZ: local_softirq_pending 22
May 8 03:41:32 rudra kernel: [ 616.744929] NOHZ: local_softirq_pending 22
May 8 03:41:32 rudra kernel: [ 616.745175] NOHZ: local_softirq_pending 22
May 8 03:41:32 rudra kernel: [ 616.745409] NOHZ: local_softirq_pending 22
May 8 03:41:34 rudra kernel: [ 618.660611] NOHZ: local_softirq_pending a2
May 8 03:41:34 rudra kernel: [ 618.660958] NOHZ: local_softirq_pending a2
May 8 03:41:34 rudra kernel: [ 618.661166] NOHZ: local_softirq_pending a2
May 8 03:41:34 rudra kernel: [ 618.661349] NOHZ: local_softirq_pending a2
May 8 03:41:34 rudra kernel: [ 618.661541] NOHZ: local_softirq_pending a2
May 8 03:41:34 rudra kernel: [ 618.661729] NOHZ: local_softirq_pending a2
May 8 03:41:34 rudra kernel: [ 618.661911] NOHZ: local_softirq_pending a2
May 8 03:41:34 rudra kernel: [ 618.662089] NOHZ: local_softirq_pending a2
May 8 03:41:37 rudra kernel: [ 621.996786] NOHZ: local_softirq_pending 22
May 8 03:41:50 rudra kernel: [ 634.831692] NOHZ: local_softirq_pending 22
May 8 03:41:50 rudra kernel: [ 634.832143] NOHZ: local_softirq_pending 22
May 8 03:41:50 rudra kernel: [ 634.832453] NOHZ: local_softirq_pending 22
May 8 03:41:50 rudra kernel: [ 634.832765] NOHZ: local_softirq_pending 22
May 8 03:41:50 rudra kernel: [ 634.833011] NOHZ: local_softirq_pending 22
May 8 03:41:50 rudra kernel: [ 634.833241] NOHZ: local_softirq_pending 22
May 8 03:41:51 rudra kernel: [ 635.790271] NOHZ: local_softirq_pending a2
May 8 03:41:51 rudra kernel: [ 635.790608] NOHZ: local_softirq_pending a2
May 8 03:41:51 rudra kernel: [ 635.790823] NOHZ: local_softirq_pending a2
May 8 03:41:51 rudra kernel: [ 635.791001] NOHZ: local_softirq_pending a2
May 8 03:41:51 rudra kernel: [ 635.791179] NOHZ: local_softirq_pending a2
May 8 03:41:51 rudra kernel: [ 635.791354] NOHZ: local_softirq_pending a2
May 8 03:41:51 rudra kernel: [ 635.791537] NOHZ: local_softirq_pending a2
May 8 03:41:53 rudra kernel: [ 637.686505] NOHZ: local_softirq_pending 22
May 8 03:41:53 rudra kernel: [ 637.686981] NOHZ: local_softirq_pending 22
May 8 03:41:53 rudra kernel: [ 637.687428] NOHZ: local_softirq_pending 22
May 8 03:42:08 rudra kernel: [ 652.941445] NOHZ: local_softirq_pending 22
May 8 03:42:08 rudra kernel: [ 652.941976] NOHZ: local_softirq_pending 22
May 8 03:42:08 rudra kernel: [ 652.942243] NOHZ: local_softirq_pending 22
May 8 03:42:08 rudra kernel: [ 652.942485] NOHZ: local_softirq_pending 22
May 8 03:42:08 rudra kernel: [ 652.942717] NOHZ: local_softirq_pending 22
May 8 03:42:08 rudra kernel: [ 652.942953] NOHZ: local_softirq_pending 22
May 8 03:42:08 rudra kernel: [ 652.943188] NOHZ: local_softirq_pending 22
May 8 03:42:09 rudra kernel: [ 653.862586] NOHZ: local_softirq_pending 22
May 8 03:42:09 rudra kernel: [ 653.862918] NOHZ: local_softirq_pending 22
May 8 03:42:09 rudra kernel: [ 653.863124] NOHZ: local_softirq_pending 22
May 8 03:42:09 rudra kernel: [ 653.863316] NOHZ: local_softirq_pending 22
May 8 03:42:09 rudra kernel: [ 653.863501] NOHZ: local_softirq_pending 22
May 8 03:42:09 rudra kernel: [ 653.863687] NOHZ: local_softirq_pending 22
May 8 03:42:09 rudra kernel: [ 653.863863] NOHZ: local_softirq_pending 22
May 8 03:42:12 rudra kernel: [ 656.714675] NOHZ: local_softirq_pending 22
May 8 03:42:12 rudra kernel: [ 656.715163] NOHZ: local_softirq_pending 22
May 8 03:42:12 rudra kernel: [ 656.715423] NOHZ: local_softirq_pending 22
May 8 03:42:12 rudra kernel: [ 656.715665] NOHZ: local_softirq_pending 22
May 8 03:42:12 rudra kernel: [ 656.715904] NOHZ: local_softirq_pending 22
May 8 03:42:12 rudra kernel: [ 656.716140] NOHZ: local_softirq_pending 22
May 8 03:42:12 rudra kernel: [ 656.716378] NOHZ: local_softirq_pending 22
May 8 03:42:12 rudra kernel: [ 656.716611] NOHZ: local_softirq_pending 22
May 8 03:42:14 rudra kernel: [ 658.622576] NOHZ: local_softirq_pending 22
May 8 03:42:15 rudra kernel: [ 659.569910] NOHZ: local_softirq_pending 22
May 8 03:42:15 rudra kernel: [ 659.570340] NOHZ: local_softirq_pending 22
May 8 03:42:15 rudra kernel: [ 659.570650] NOHZ: local_softirq_pending 22
May 8 03:42:15 rudra kernel: [ 659.570924] NOHZ: local_softirq_pending 22
May 8 03:42:15 rudra kernel: [ 659.571159] NOHZ: local_softirq_pending 22
May 8 03:42:15 rudra kernel: [ 659.571393] NOHZ: local_softirq_pending 22
May 9 01:10:43 rudra kernel: [ 4472.241952] NOHZ: local_softirq_pending 22
May 9 01:10:43 rudra kernel: [ 4472.243018] NOHZ: local_softirq_pending 22
May 9 01:10:43 rudra kernel: [ 4472.243383] NOHZ: local_softirq_pending 22
May 9 01:11:15 rudra kernel: [ 4504.194191] NOHZ: local_softirq_pending 22
May 9 01:11:15 rudra kernel: [ 4504.194815] NOHZ: local_softirq_pending 22
May 9 01:11:15 rudra kernel: [ 4504.195140] NOHZ: local_softirq_pending 22
May 9 01:11:35 rudra kernel: [ 4524.158524] NOHZ: local_softirq_pending 22
May 9 01:11:35 rudra kernel: [ 4524.159118] NOHZ: local_softirq_pending 22
May 9 01:11:35 rudra kernel: [ 4524.159439] NOHZ: local_softirq_pending 22
May 9 01:11:45 rudra kernel: [ 4534.140638] NOHZ: local_softirq_pending 22
May 9 01:11:45 rudra kernel: [ 4534.141046] NOHZ: local_softirq_pending 22
May 9 01:11:45 rudra kernel: [ 4534.141456] NOHZ: local_softirq_pending 22
May 9 01:11:45 rudra kernel: [ 4534.141738] NOHZ: local_softirq_pending 22
May 9 01:12:32 rudra kernel: [ 4580.718873] NOHZ: local_softirq_pending 22
May 9 01:12:32 rudra kernel: [ 4580.719297] NOHZ: local_softirq_pending 22
May 9 01:12:32 rudra kernel: [ 4580.719557] NOHZ: local_softirq_pending 22
May 9 01:12:32 rudra kernel: [ 4580.719808] NOHZ: local_softirq_pending 22
May 9 01:12:32 rudra kernel: [ 4580.720047] NOHZ: local_softirq_pending 22
May 9 01:12:32 rudra kernel: [ 4580.720295] NOHZ: local_softirq_pending 22
May 9 01:12:32 rudra kernel: [ 4580.720534] NOHZ: local_softirq_pending 22
May 9 01:12:36 rudra kernel: [ 4585.053403] NOHZ: local_softirq_pending 22
May 9 01:12:36 rudra kernel: [ 4585.054308] NOHZ: local_softirq_pending 22
May 9 01:12:36 rudra kernel: [ 4585.054588] NOHZ: local_softirq_pending 22
May 9 01:12:36 rudra kernel: [ 4585.054796] NOHZ: local_softirq_pending 22
May 9 01:12:36 rudra kernel: [ 4585.054981] NOHZ: local_softirq_pending 22
May 9 01:12:36 rudra kernel: [ 4585.055163] NOHZ: local_softirq_pending 22
May 9 01:12:38 rudra kernel: [ 4586.927035] NOHZ: local_softirq_pending 22
May 9 01:12:51 rudra kernel: [ 4599.749155] NOHZ: local_softirq_pending 22
May 9 01:12:51 rudra kernel: [ 4599.750614] NOHZ: local_softirq_pending 22
May 9 01:12:53 rudra kernel: [ 4601.648012] NOHZ: local_softirq_pending 22
May 9 01:12:53 rudra kernel: [ 4601.648457] NOHZ: local_softirq_pending 22
May 9 01:12:53 rudra kernel: [ 4601.648722] NOHZ: local_softirq_pending 22
May 9 01:12:53 rudra kernel: [ 4601.648971] NOHZ: local_softirq_pending 22
May 9 01:12:53 rudra kernel: [ 4601.649217] NOHZ: local_softirq_pending 22
May 9 01:12:53 rudra kernel: [ 4601.649463] NOHZ: local_softirq_pending 22
May 9 01:12:53 rudra kernel: [ 4601.649705] NOHZ: local_softirq_pending 22
May 9 01:12:53 rudra kernel: [ 4601.649951] NOHZ: local_softirq_pending 22
May 9 01:19:16 rudra kernel: [ 325.029390] NOHZ: local_softirq_pending 22
TIA
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-09 14:12 [BUG] local_softirq_pending storm Anant Nitya
@ 2007-05-09 16:31 ` Thomas Gleixner
2007-05-10 11:53 ` Anant Nitya
0 siblings, 1 reply; 27+ messages in thread
From: Thomas Gleixner @ 2007-05-09 16:31 UTC (permalink / raw)
To: Anant Nitya; +Cc: linux-kernel
On Wed, 2007-05-09 at 19:42 +0530, Anant Nitya wrote:
> Hi,
> Ever since I upgrade to 2.6.21/.1, system log is filled with following
> messages if I enable CONFIG_NO_HZ=y, going through archives it seems ingo
> sometime back posted some patch and now it is upstream, but its not helping
> here. If I disable NOHZ by kernel command line nohz=off this problem
> disappears. This system is P4/2.40GHz/HT with SMP/SMT on in kernel config.
> One more thing that I noticed is this problem only arises while using X or
> network otherwise plain command line with no network access don't trigger
> this with nohz=on.
Is this independent of the load on the system ? i.e. : What happens if
you only use the console and run a kernel compile with -j4 ?
> dumdum@hahakaar [~]$ >> grep NOHZ /var/log/messages
> May 8 03:38:14 rudra kernel: [ 419.271195] NOHZ: local_softirq_pending 02
> May 8 03:38:14 rudra kernel: [ 419.271663] NOHZ: local_softirq_pending 02
The patch below ratelimits the printk output, so your syslog is not
flooded anymore.
tglx
Index: linux-2.6.21/kernel/time/tick-sched.c
===================================================================
--- linux-2.6.21.orig/kernel/time/tick-sched.c
+++ linux-2.6.21/kernel/time/tick-sched.c
@@ -167,9 +167,15 @@ void tick_nohz_stop_sched_tick(void)
goto end;
cpu = smp_processor_id();
- if (unlikely(local_softirq_pending()))
- printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
- local_softirq_pending());
+ if (unlikely(local_softirq_pending())) {
+ static int ratelimit;
+
+ if (ratelimit < 10) {
+ printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
+ local_softirq_pending());
+ ratelimit++;
+ }
+ }
now = ktime_get();
/*
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-09 16:31 ` Thomas Gleixner
@ 2007-05-10 11:53 ` Anant Nitya
2007-05-10 21:58 ` Thomas Gleixner
0 siblings, 1 reply; 27+ messages in thread
From: Anant Nitya @ 2007-05-10 11:53 UTC (permalink / raw)
To: tglx; +Cc: linux-kernel
On 5/9/07, Thomas Gleixner <tglx@linutronix.de> wrote:
> On Wed, 2007-05-09 at 19:42 +0530, Anant Nitya wrote:
> > Hi,
> > Ever since I upgrade to 2.6.21/.1, system log is filled with following
> > messages if I enable CONFIG_NO_HZ=y, going through archives it seems ingo
> > sometime back posted some patch and now it is upstream, but its not helping
> > here. If I disable NOHZ by kernel command line nohz=off this problem
> > disappears. This system is P4/2.40GHz/HT with SMP/SMT on in kernel config.
> > One more thing that I noticed is this problem only arises while using X or
> > network otherwise plain command line with no network access don't trigger
> > this with nohz=on.
>
> Is this independent of the load on the system ? i.e. : What happens if
> you only use the console and run a kernel compile with -j4 ?
Yep, it seems independent of load on the system, to test I compiled
kernel with make -j8 and to throw some more load same time I also used
amavisd to clean around 2000 of spam/virus infected mails and same
time was listening to few radio stream over net in console only login
mode. Even then there was not a single NOHZ: local_softirq_pending
message in log. Once kernel got compiled and amavisd finished its job
and load drops back to around 0.5/2.0 I started X and within few secs
log starts getting filled with local_softirq_pending messages, (sorry,
I didn't applied ratelimit patch since I wanted to test is it high
load on system that causes this or something else). It seems even
network operation is not causing this. It seems either X is doing
something terribly wrong or kernel is getting hosed by X.
If some more information is needed please feel free to ask
dumdum@hahakaar [~]$ >> grep load top.log
top - 14:04:12 up 15 min, 4 users, load average: 9.42, 5.12, 2.20
top - 14:04:17 up 15 min, 4 users, load average: 9.47, 5.20, 2.24
top - 14:04:22 up 16 min, 4 users, load average: 9.35, 5.25, 2.27
top - 14:04:27 up 16 min, 4 users, load average: 9.32, 5.31, 2.31
top - 14:04:32 up 16 min, 4 users, load average: 9.22, 5.36, 2.34
top - 14:04:37 up 16 min, 4 users, load average: 9.36, 5.45, 2.38
top - 14:04:42 up 16 min, 4 users, load average: 9.33, 5.51, 2.42
top - 14:04:47 up 16 min, 4 users, load average: 9.38, 5.58, 2.46
top - 14:04:52 up 16 min, 4 users, load average: 9.35, 5.64, 2.49
top - 14:04:57 up 16 min, 4 users, load average: 9.24, 5.68, 2.52
top - 14:05:02 up 16 min, 4 users, load average: 9.14, 5.72, 2.55
top - 14:05:07 up 16 min, 4 users, load average: 9.05, 5.75, 2.58
top - 14:05:12 up 16 min, 4 users, load average: 9.13, 5.83, 2.62
top - 14:05:17 up 16 min, 4 users, load average: 9.28, 5.91, 2.66
top - 14:05:22 up 17 min, 4 users, load average: 9.34, 5.98, 2.70
top - 14:05:27 up 17 min, 4 users, load average: 9.47, 6.06, 2.75
top - 14:05:32 up 17 min, 4 users, load average: 9.43, 6.11, 2.78
top - 14:05:37 up 17 min, 4 users, load average: 9.32, 6.14, 2.81
top - 14:05:42 up 17 min, 4 users, load average: 9.37, 6.20, 2.85
top - 14:05:47 up 17 min, 4 users, load average: 9.26, 6.23, 2.87
top - 14:05:52 up 17 min, 4 users, load average: 9.16, 6.26, 2.90
top - 14:05:58 up 17 min, 4 users, load average: 9.07, 6.29, 2.93
top - 14:06:03 up 17 min, 4 users, load average: 9.14, 6.35, 2.97
top - 14:06:08 up 17 min, 4 users, load average: 9.13, 6.40, 3.00
top - 14:06:13 up 17 min, 4 users, load average: 9.28, 6.47, 3.04
top - 14:06:18 up 17 min, 4 users, load average: 9.34, 6.53, 3.08
top - 14:06:23 up 18 min, 4 users, load average: 9.31, 6.57, 3.11
top - 14:06:28 up 18 min, 4 users, load average: 9.36, 6.63, 3.15
top - 14:06:33 up 18 min, 4 users, load average: 9.25, 6.65, 3.17
top - 14:06:38 up 18 min, 4 users, load average: 9.23, 6.69, 3.20
top - 14:06:43 up 18 min, 4 users, load average: 9.38, 6.76, 3.25
top - 14:06:48 up 18 min, 4 users, load average: 9.27, 6.78, 3.27
top - 14:06:53 up 18 min, 4 users, load average: 9.32, 6.84, 3.31
top - 14:06:58 up 18 min, 4 users, load average: 9.70, 6.95, 3.36
top - 14:07:03 up 18 min, 4 users, load average: 9.72, 7.00, 3.40
top - 14:07:08 up 18 min, 4 users, load average: 9.82, 7.07, 3.44
top - 14:07:13 up 18 min, 4 users, load average: 9.84, 7.12, 3.48
top - 14:07:18 up 18 min, 4 users, load average: 9.85, 7.17, 3.51
top - 14:07:23 up 19 min, 4 users, load average: 9.78, 7.20, 3.54
top - 14:07:28 up 19 min, 4 users, load average: 9.80, 7.24, 3.57
top - 14:07:33 up 19 min, 4 users, load average: 10.14, 7.40, 3.66
top - 14:07:38 up 19 min, 4 users, load average: 10.45, 7.51, 3.72
top - 14:07:43 up 19 min, 4 users, load average: 10.33, 7.53, 3.75
top - 14:07:48 up 19 min, 4 users, load average: 9.58, 7.42, 3.73
top - 14:07:53 up 19 min, 4 users, load average: 8.97, 7.33, 3.72
top - 14:07:58 up 19 min, 4 users, load average: 8.34, 7.23, 3.71
top - 14:08:03 up 19 min, 4 users, load average: 8.31, 7.24, 3.73
top - 14:08:08 up 19 min, 4 users, load average: 8.36, 7.27, 3.76
top - 14:08:13 up 19 min, 4 users, load average: 8.89, 7.40, 3.82
top - 14:08:18 up 20 min, 4 users, load average: 8.34, 7.31, 3.81
top - 14:08:23 up 20 min, 4 users, load average: 8.47, 7.35, 3.84
top - 14:08:28 up 20 min, 4 users, load average: 8.52, 7.38, 3.87
top - 14:08:33 up 20 min, 4 users, load average: 8.56, 7.41, 3.90
top - 14:08:39 up 20 min, 4 users, load average: 8.51, 7.42, 3.92
top - 14:08:44 up 20 min, 4 users, load average: 8.63, 7.46, 3.95
top - 14:08:49 up 20 min, 4 users, load average: 8.66, 7.48, 3.98
top - 14:08:54 up 20 min, 4 users, load average: 8.85, 7.54, 4.02
top - 14:08:59 up 20 min, 4 users, load average: 8.94, 7.58, 4.05
top - 14:09:04 up 20 min, 4 users, load average: 9.02, 7.62, 4.08
top - 14:09:09 up 20 min, 4 users, load average: 9.02, 7.64, 4.10
top - 14:09:14 up 20 min, 4 users, load average: 8.94, 7.65, 4.13
top - 14:09:19 up 21 min, 4 users, load average: 9.02, 7.69, 4.16
top - 14:09:24 up 21 min, 4 users, load average: 8.94, 7.69, 4.18
top - 14:09:29 up 21 min, 4 users, load average: 8.87, 7.70, 4.20
top - 14:09:34 up 21 min, 4 users, load average: 8.88, 7.72, 4.22
top - 14:09:39 up 21 min, 4 users, load average: 8.81, 7.72, 4.24
top - 14:09:44 up 21 min, 4 users, load average: 8.82, 7.75, 4.27
top - 14:09:49 up 21 min, 4 users, load average: 8.76, 7.75, 4.29
top - 14:09:54 up 21 min, 4 users, load average: 8.85, 7.79, 4.32
top - 14:09:59 up 21 min, 4 users, load average: 8.79, 7.79, 4.34
top - 14:10:04 up 21 min, 4 users, load average: 8.88, 7.83, 4.37
top - 14:10:09 up 21 min, 4 users, load average: 8.81, 7.83, 4.39
top - 14:10:14 up 21 min, 5 users, load average: 8.75, 7.83, 4.41
top - 14:10:19 up 22 min, 5 users, load average: 8.77, 7.85, 4.43
top - 14:10:24 up 22 min, 5 users, load average: 8.79, 7.87, 4.46
top - 14:10:29 up 22 min, 5 users, load average: 8.72, 7.87, 4.47
top - 14:10:34 up 22 min, 5 users, load average: 8.74, 7.89, 4.50
top - 14:10:39 up 22 min, 5 users, load average: 8.92, 7.94, 4.53
top - 14:10:44 up 22 min, 5 users, load average: 9.17, 8.01, 4.57
top - 14:10:49 up 22 min, 5 users, load average: 9.24, 8.04, 4.60
top - 14:10:54 up 22 min, 5 users, load average: 9.14, 8.04, 4.62
top - 14:10:59 up 22 min, 5 users, load average: 9.21, 8.07, 4.65
top - 14:11:04 up 22 min, 5 users, load average: 9.27, 8.10, 4.68
top - 14:11:09 up 22 min, 5 users, load average: 9.25, 8.12, 4.70
top - 14:11:14 up 22 min, 5 users, load average: 9.15, 8.12, 4.72
top - 14:11:19 up 23 min, 5 users, load average: 9.06, 8.11, 4.73
top - 14:11:24 up 23 min, 5 users, load average: 8.97, 8.11, 4.75
top - 14:11:29 up 23 min, 5 users, load average: 9.13, 8.16, 4.79
top - 14:11:35 up 23 min, 5 users, load average: 9.04, 8.16, 4.80
top - 14:11:40 up 23 min, 5 users, load average: 9.12, 8.19, 4.83
top - 14:11:45 up 23 min, 5 users, load average: 9.27, 8.23, 4.86
top - 14:11:50 up 23 min, 5 users, load average: 9.33, 8.26, 4.89
top - 14:11:55 up 23 min, 5 users, load average: 9.22, 8.26, 4.91
top - 14:12:00 up 23 min, 5 users, load average: 9.28, 8.29, 4.93
top - 14:12:05 up 23 min, 5 users, load average: 9.34, 8.32, 4.96
top - 14:12:10 up 23 min, 5 users, load average: 9.47, 8.36, 4.99
top - 14:12:15 up 23 min, 5 users, load average: 9.51, 8.39, 5.02
top - 14:12:20 up 24 min, 5 users, load average: 9.47, 8.40, 5.04
top - 14:12:25 up 24 min, 5 users, load average: 9.52, 8.42, 5.07
top - 14:12:30 up 24 min, 5 users, load average: 9.47, 8.43, 5.09
top - 14:12:35 up 24 min, 5 users, load average: 9.36, 8.43, 5.10
top - 14:12:40 up 24 min, 5 users, load average: 9.25, 8.42, 5.12
top - 14:12:45 up 24 min, 5 users, load average: 9.39, 8.46, 5.15
top - 14:12:50 up 24 min, 5 users, load average: 9.36, 8.47, 5.17
top - 14:12:55 up 24 min, 5 users, load average: 9.41, 8.50, 5.20
top - 14:13:00 up 24 min, 5 users, load average: 9.45, 8.52, 5.22
top - 14:13:05 up 24 min, 5 users, load average: 9.34, 8.51, 5.24
top - 14:13:10 up 24 min, 5 users, load average: 9.23, 8.50, 5.25
top - 14:13:15 up 24 min, 5 users, load average: 9.29, 8.53, 5.28
top - 14:13:20 up 25 min, 5 users, load average: 9.35, 8.55, 5.30
top - 14:13:25 up 25 min, 5 users, load average: 9.32, 8.56, 5.32
top - 14:13:30 up 25 min, 5 users, load average: 9.21, 8.55, 5.34
top - 14:13:35 up 25 min, 5 users, load average: 9.20, 8.56, 5.35
top - 14:13:40 up 25 min, 5 users, load average: 9.10, 8.55, 5.37
top - 14:13:45 up 25 min, 5 users, load average: 9.17, 8.57, 5.39
top - 14:13:50 up 25 min, 5 users, load average: 9.08, 8.56, 5.41
top - 14:13:55 up 25 min, 5 users, load average: 9.07, 8.57, 5.43
top - 14:14:00 up 25 min, 5 users, load average: 8.99, 8.56, 5.44
top - 14:14:05 up 25 min, 5 users, load average: 8.91, 8.55, 5.45
top - 14:14:10 up 25 min, 5 users, load average: 8.91, 8.56, 5.47
top - 14:14:16 up 25 min, 5 users, load average: 8.92, 8.56, 5.49
top - 14:14:21 up 26 min, 5 users, load average: 8.85, 8.55, 5.50
top - 14:14:26 up 26 min, 5 users, load average: 8.86, 8.56, 5.52
top - 14:14:31 up 26 min, 5 users, load average: 9.03, 8.60, 5.55
top - 14:14:36 up 26 min, 5 users, load average: 9.19, 8.64, 5.58
top - 14:14:41 up 26 min, 5 users, load average: 9.17, 8.65, 5.60
top - 14:14:46 up 26 min, 5 users, load average: 9.24, 8.67, 5.62
top - 14:14:51 up 26 min, 5 users, load average: 9.22, 8.67, 5.64
top - 14:14:56 up 26 min, 5 users, load average: 9.28, 8.70, 5.66
top - 14:15:01 up 26 min, 5 users, load average: 9.26, 8.70, 5.68
top - 14:15:06 up 26 min, 5 users, load average: 9.16, 8.69, 5.69
top - 14:15:11 up 26 min, 5 users, load average: 9.14, 8.69, 5.71
top - 14:15:16 up 26 min, 5 users, load average: 9.05, 8.68, 5.72
top - 14:15:21 up 27 min, 5 users, load average: 9.13, 8.70, 5.75
top - 14:15:26 up 27 min, 5 users, load average: 9.04, 8.69, 5.76
top - 14:15:31 up 27 min, 5 users, load average: 9.11, 8.71, 5.78
top - 14:15:36 up 27 min, 5 users, load average: 9.19, 8.74, 5.80
top - 14:15:41 up 27 min, 5 users, load average: 9.17, 8.74, 5.82
top - 14:15:46 up 27 min, 5 users, load average: 9.08, 8.73, 5.83
top - 14:15:51 up 27 min, 5 users, load average: 8.99, 8.71, 5.84
top - 14:15:56 up 27 min, 5 users, load average: 8.99, 8.72, 5.86
top - 14:16:01 up 27 min, 5 users, load average: 8.99, 8.72, 5.88
top - 14:16:06 up 27 min, 5 users, load average: 8.91, 8.71, 5.89
top - 14:16:11 up 27 min, 5 users, load average: 8.92, 8.72, 5.90
top - 14:16:16 up 27 min, 5 users, load average: 9.00, 8.74, 5.93
top - 14:16:21 up 28 min, 5 users, load average: 9.00, 8.74, 5.94
top - 14:16:26 up 28 min, 5 users, load average: 9.00, 8.74, 5.96
top - 14:16:31 up 28 min, 5 users, load average: 9.00, 8.75, 5.97
top - 14:16:37 up 28 min, 5 users, load average: 9.08, 8.77, 6.00
top - 14:16:42 up 28 min, 5 users, load average: 9.16, 8.79, 6.02
top - 14:16:47 up 28 min, 5 users, load average: 9.06, 8.78, 6.03
top - 14:16:52 up 28 min, 5 users, load average: 8.98, 8.76, 6.04
top - 14:16:57 up 28 min, 5 users, load average: 8.90, 8.75, 6.05
top - 14:17:02 up 28 min, 5 users, load average: 9.15, 8.80, 6.08
top - 14:17:07 up 28 min, 5 users, load average: 9.14, 8.81, 6.09
top - 14:17:12 up 28 min, 5 users, load average: 9.12, 8.81, 6.11
top - 14:17:17 up 28 min, 5 users, load average: 9.11, 8.81, 6.12
top - 14:17:22 up 29 min, 5 users, load average: 9.02, 8.80, 6.13
top - 14:17:27 up 29 min, 5 users, load average: 9.02, 8.80, 6.15
top - 14:17:32 up 29 min, 5 users, load average: 9.02, 8.80, 6.16
top - 14:17:37 up 29 min, 5 users, load average: 9.18, 8.84, 6.19
top - 14:17:42 up 29 min, 5 users, load average: 9.24, 8.86, 6.21
top - 14:17:47 up 29 min, 5 users, load average: 9.22, 8.86, 6.23
top - 14:17:52 up 29 min, 5 users, load average: 9.21, 8.86, 6.24
top - 14:17:57 up 29 min, 5 users, load average: 9.19, 8.87, 6.25
top - 14:18:02 up 29 min, 5 users, load average: 9.33, 8.90, 6.28
top - 14:18:07 up 29 min, 5 users, load average: 9.47, 8.93, 6.31
top - 14:18:12 up 29 min, 5 users, load average: 9.43, 8.94, 6.32
top - 14:18:17 up 29 min, 5 users, load average: 9.47, 8.95, 6.34
top - 14:18:22 up 30 min, 5 users, load average: 9.52, 8.97, 6.36
top - 14:18:27 up 30 min, 5 users, load average: 9.64, 9.00, 6.38
top - 14:18:32 up 30 min, 5 users, load average: 9.58, 9.00, 6.40
top - 14:18:37 up 30 min, 5 users, load average: 9.62, 9.02, 6.42
top - 14:18:42 up 30 min, 5 users, load average: 9.65, 9.04, 6.43
top - 14:18:47 up 30 min, 5 users, load average: 9.68, 9.05, 6.45
top - 14:18:52 up 30 min, 5 users, load average: 9.86, 9.10, 6.48
top - 14:18:57 up 30 min, 5 users, load average: 10.03, 9.15, 6.51
top - 14:19:02 up 30 min, 5 users, load average: 10.11, 9.18, 6.54
top - 14:19:07 up 30 min, 5 users, load average: 10.18, 9.21, 6.56
top - 14:19:12 up 30 min, 6 users, load average: 10.25, 9.24, 6.58
top - 14:19:17 up 30 min, 6 users, load average: 10.47, 9.30, 6.62
top - 14:19:22 up 31 min, 6 users, load average: 10.51, 9.33, 6.64
top - 14:19:27 up 31 min, 6 users, load average: 10.47, 9.34, 6.66
top - 14:19:32 up 31 min, 6 users, load average: 10.59, 9.38, 6.69
top - 14:19:38 up 31 min, 6 users, load average: 10.46, 9.38, 6.70
top - 14:19:43 up 31 min, 6 users, load average: 10.59, 9.42, 6.73
top - 14:19:48 up 31 min, 6 users, load average: 10.46, 9.41, 6.74
top - 14:19:53 up 31 min, 6 users, load average: 10.34, 9.40, 6.75
top - 14:19:58 up 31 min, 6 users, load average: 10.23, 9.40, 6.76
top - 14:20:03 up 31 min, 6 users, load average: 10.29, 9.42, 6.79
top - 14:20:08 up 31 min, 6 users, load average: 10.19, 9.42, 6.80
top - 14:20:13 up 31 min, 6 users, load average: 10.26, 9.44, 6.82
top - 14:20:18 up 31 min, 6 users, load average: 10.23, 9.45, 6.84
top - 14:20:23 up 32 min, 6 users, load average: 10.14, 9.44, 6.85
top - 14:20:28 up 32 min, 6 users, load average: 10.04, 9.44, 6.86
top - 14:20:33 up 32 min, 6 users, load average: 9.96, 9.43, 6.87
top - 14:20:38 up 32 min, 6 users, load average: 10.12, 9.47, 6.90
top - 14:20:43 up 32 min, 6 users, load average: 10.11, 9.48, 6.91
top - 14:20:48 up 32 min, 6 users, load average: 10.10, 9.49, 6.93
top - 14:20:53 up 32 min, 6 users, load average: 10.18, 9.51, 6.95
top - 14:20:58 up 32 min, 6 users, load average: 10.08, 9.50, 6.96
top - 14:21:03 up 32 min, 6 users, load average: 9.99, 9.50, 6.97
top - 14:21:08 up 32 min, 6 users, load average: 10.07, 9.52, 7.00
top - 14:21:13 up 32 min, 6 users, load average: 9.99, 9.51, 7.01
top - 14:21:18 up 32 min, 6 users, load average: 10.23, 9.57, 7.04
top - 14:21:23 up 33 min, 6 users, load average: 10.13, 9.56, 7.05
top - 14:21:28 up 33 min, 6 users, load average: 10.19, 9.59, 7.08
top - 14:21:33 up 33 min, 6 users, load average: 10.17, 9.60, 7.10
top - 14:21:38 up 33 min, 6 users, load average: 10.40, 9.65, 7.13
top - 14:21:43 up 33 min, 6 users, load average: 10.45, 9.67, 7.15
top - 14:21:49 up 33 min, 6 users, load average: 10.65, 9.73, 7.18
top - 14:21:54 up 33 min, 6 users, load average: 10.52, 9.72, 7.19
top - 14:21:59 up 33 min, 6 users, load average: 10.64, 9.75, 7.22
top - 14:22:04 up 33 min, 6 users, load average: 10.59, 9.76, 7.23
top - 14:22:09 up 33 min, 6 users, load average: 10.54, 9.76, 7.25
top - 14:22:14 up 33 min, 6 users, load average: 11.14, 9.90, 7.30
top - 14:22:19 up 34 min, 6 users, load average: 11.21, 9.93, 7.33
top - 14:22:24 up 34 min, 6 users, load average: 11.03, 9.92, 7.34
top - 14:22:29 up 34 min, 6 users, load average: 11.11, 9.95, 7.36
top - 14:22:34 up 34 min, 6 users, load average: 10.86, 9.92, 7.37
top - 14:22:39 up 34 min, 6 users, load average: 10.79, 9.92, 7.38
top - 14:22:44 up 34 min, 6 users, load average: 10.81, 9.94, 7.40
top - 14:22:49 up 34 min, 6 users, load average: 10.82, 9.96, 7.42
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top - 14:23:04 up 34 min, 6 users, load average: 10.58, 9.94, 7.45
top - 14:23:10 up 34 min, 6 users, load average: 10.37, 9.91, 7.46
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top - 14:23:20 up 35 min, 6 users, load average: 10.39, 9.93, 7.49
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top - 14:23:40 up 35 min, 6 users, load average: 10.71, 10.03, 7.57
top - 14:23:45 up 35 min, 6 users, load average: 10.73, 10.05, 7.59
top - 14:23:50 up 35 min, 6 users, load average: 10.83, 10.08, 7.61
top - 14:23:55 up 35 min, 6 users, load average: 11.08, 10.14, 7.65
top - 14:24:00 up 35 min, 6 users, load average: 11.00, 10.14, 7.66
top - 14:24:05 up 35 min, 6 users, load average: 10.92, 10.14, 7.67
top - 14:24:10 up 35 min, 6 users, load average: 10.76, 10.12, 7.68
top - 14:24:15 up 35 min, 6 users, load average: 10.78, 10.13, 7.70
top - 14:24:20 up 36 min, 6 users, load average: 12.88, 10.58, 7.85
top - 14:24:25 up 36 min, 6 users, load average: 13.05, 10.65, 7.89
top - 14:24:30 up 36 min, 6 users, load average: 12.89, 10.66, 7.91
top - 14:24:35 up 36 min, 6 users, load average: 12.82, 10.68, 7.93
top - 14:24:40 up 36 min, 6 users, load average: 12.59, 10.67, 7.94
top - 14:24:46 up 36 min, 6 users, load average: 12.46, 10.67, 7.96
top - 14:24:51 up 36 min, 6 users, load average: 12.51, 10.71, 7.98
top - 14:24:56 up 36 min, 6 users, load average: 12.30, 10.70, 8.00
top - 14:25:01 up 36 min, 6 users, load average: 12.12, 10.69, 8.01
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top - 14:25:11 up 36 min, 6 users, load average: 12.19, 10.75, 8.05
top - 14:25:16 up 36 min, 6 users, load average: 11.93, 10.72, 8.06
top - 14:25:21 up 37 min, 6 users, load average: 11.94, 10.74, 8.08
top - 14:25:26 up 37 min, 6 users, load average: 11.62, 10.69, 8.08
top - 14:25:31 up 37 min, 6 users, load average: 11.57, 10.70, 8.09
top - 14:25:36 up 37 min, 6 users, load average: 11.45, 10.69, 8.10
top - 14:25:41 up 37 min, 6 users, load average: 11.49, 10.71, 8.12
top - 14:25:46 up 37 min, 6 users, load average: 11.69, 10.76, 8.16
top - 14:25:51 up 37 min, 6 users, load average: 11.64, 10.77, 8.17
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top - 14:26:01 up 37 min, 6 users, load average: 11.46, 10.76, 8.20
top - 14:26:06 up 37 min, 6 users, load average: 11.58, 10.79, 8.22
top - 14:26:11 up 37 min, 6 users, load average: 11.53, 10.80, 8.24
top - 14:26:16 up 37 min, 6 users, load average: 11.41, 10.78, 8.25
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top - 14:26:41 up 38 min, 6 users, load average: 10.73, 10.67, 8.28
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top - 14:26:57 up 38 min, 6 users, load average: 10.81, 10.69, 8.32
top - 14:27:02 up 38 min, 6 users, load average: 10.66, 10.66, 8.32
top - 14:27:07 up 38 min, 6 users, load average: 10.85, 10.70, 8.35
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top - 14:27:22 up 39 min, 6 users, load average: 10.91, 10.71, 8.39
top - 14:27:27 up 39 min, 6 users, load average: 10.99, 10.73, 8.41
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top - 14:28:02 up 39 min, 6 users, load average: 11.07, 10.78, 8.51
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top - 14:28:12 up 39 min, 6 users, load average: 10.99, 10.77, 8.53
top - 14:28:17 up 39 min, 6 users, load average: 10.91, 10.76, 8.54
top - 14:28:22 up 40 min, 6 users, load average: 10.76, 10.73, 8.54
top - 14:28:27 up 40 min, 6 users, load average: 10.70, 10.71, 8.55
top - 14:28:32 up 40 min, 6 users, load average: 10.72, 10.72, 8.56
top - 14:28:37 up 40 min, 6 users, load average: 10.58, 10.69, 8.56
top - 14:28:42 up 40 min, 6 users, load average: 10.61, 10.69, 8.57
top - 14:28:47 up 40 min, 6 users, load average: 10.49, 10.67, 8.58
top - 14:28:53 up 40 min, 6 users, load average: 10.45, 10.66, 8.58
top - 14:28:58 up 40 min, 6 users, load average: 10.33, 10.63, 8.58
top - 14:29:03 up 40 min, 6 users, load average: 10.46, 10.65, 8.60
top - 14:29:08 up 40 min, 6 users, load average: 10.43, 10.64, 8.61
top - 14:29:13 up 40 min, 6 users, load average: 10.39, 10.63, 8.62
top - 14:29:18 up 40 min, 6 users, load average: 10.68, 10.68, 8.65
top - 14:29:23 up 41 min, 6 users, load average: 10.79, 10.70, 8.66
top - 14:29:28 up 41 min, 6 users, load average: 10.64, 10.68, 8.66
top - 14:29:33 up 41 min, 6 users, load average: 10.75, 10.70, 8.68
top - 14:29:38 up 41 min, 6 users, load average: 10.85, 10.72, 8.70
top - 14:29:43 up 41 min, 6 users, load average: 10.78, 10.71, 8.71
top - 14:29:48 up 41 min, 6 users, load average: 10.96, 10.75, 8.73
top - 14:29:53 up 41 min, 6 users, load average: 11.12, 10.78, 8.75
top - 14:29:58 up 41 min, 6 users, load average: 11.19, 10.80, 8.77
top - 14:30:03 up 41 min, 6 users, load average: 11.55, 10.89, 8.82
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top - 14:32:05 up 43 min, 6 users, load average: 10.68, 10.74, 9.01
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top - 14:32:30 up 44 min, 6 users, load average: 10.86, 10.78, 9.06
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top - 14:33:00 up 44 min, 6 users, load average: 11.07, 10.83, 9.14
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top - 15:07:21 up 1:19, 6 users, load average: 1.29, 2.52, 5.35
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top - 15:09:22 up 1:21, 6 users, load average: 1.32, 2.14, 4.87
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top - 15:10:22 up 1:22, 6 users, load average: 1.14, 1.93, 4.62
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top - 15:12:58 up 1:24, 6 users, load average: 1.36, 1.62, 4.08
top - 15:13:03 up 1:24, 6 users, load average: 1.33, 1.61, 4.06
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top - 15:13:23 up 1:25, 6 users, load average: 1.22, 1.57, 4.00
top - 15:13:28 up 1:25, 6 users, load average: 1.12, 1.54, 3.97
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top - 15:13:38 up 1:25, 6 users, load average: 1.11, 1.52, 3.94
top - 15:13:43 up 1:25, 6 users, load average: 1.02, 1.50, 3.92
top - 15:13:48 up 1:25, 6 users, load average: 1.10, 1.51, 3.91
top - 15:13:53 up 1:25, 6 users, load average: 1.09, 1.50, 3.89
top - 15:13:58 up 1:25, 6 users, load average: 1.32, 1.54, 3.89
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top - 15:14:23 up 1:26, 6 users, load average: 3.54, 1.99, 3.98
top - 15:14:28 up 1:26, 6 users, load average: 4.99, 2.35, 4.07
top - 15:14:33 up 1:26, 6 users, load average: 5.71, 2.55, 4.13
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top - 15:15:19 up 1:27, 6 users, load average: 5.93, 3.07, 4.23
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top - 15:15:55 up 1:27, 6 users, load average: 10.19, 4.33, 4.60
top - 15:16:00 up 1:27, 6 users, load average: 10.10, 4.41, 4.62
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top - 15:16:15 up 1:27, 6 users, load average: 9.82, 4.63, 4.69
top - 15:16:20 up 1:28, 6 users, load average: 9.60, 4.67, 4.71
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top - 15:17:21 up 1:29, 6 users, load average: 7.79, 5.08, 4.85
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top - 15:23:55 up 1:35, 6 users, load average: 0.27, 2.53, 3.89
top - 15:24:00 up 1:35, 6 users, load average: 0.25, 2.49, 3.87
top - 15:24:05 up 1:35, 6 users, load average: 0.23, 2.44, 3.85
top - 15:24:10 up 1:35, 6 users, load average: 0.21, 2.40, 3.83
top - 15:24:15 up 1:35, 6 users, load average: 0.19, 2.36, 3.81
top - 15:24:20 up 1:36, 6 users, load average: 0.18, 2.32, 3.79
top - 15:24:25 up 1:36, 6 users, load average: 0.16, 2.28, 3.77
top - 15:24:30 up 1:36, 6 users, load average: 0.15, 2.25, 3.75
top - 15:24:35 up 1:36, 6 users, load average: 0.14, 2.21, 3.73
top - 15:24:40 up 1:36, 6 users, load average: 0.13, 2.17, 3.71
top - 15:24:45 up 1:36, 6 users, load average: 0.12, 2.14, 3.69
top - 15:24:50 up 1:36, 6 users, load average: 0.11, 2.10, 3.67
top - 15:24:55 up 1:36, 6 users, load average: 0.10, 2.06, 3.65
top - 15:25:00 up 1:36, 6 users, load average: 0.09, 2.03, 3.63
top - 15:25:05 up 1:36, 6 users, load average: 0.08, 2.00, 3.61
top - 15:25:11 up 1:36, 6 users, load average: 0.08, 1.96, 3.59
top - 15:25:16 up 1:36, 6 users, load average: 0.07, 1.93, 3.57
top - 15:25:21 up 1:37, 6 users, load average: 0.06, 1.90, 3.55
top - 15:25:26 up 1:37, 6 users, load average: 0.06, 1.87, 3.53
top - 15:25:31 up 1:37, 6 users, load average: 0.05, 1.83, 3.51
top - 15:25:36 up 1:37, 6 users, load average: 0.05, 1.80, 3.49
top - 15:25:41 up 1:37, 6 users, load average: 0.05, 1.77, 3.47
top - 15:25:46 up 1:37, 6 users, load average: 0.04, 1.74, 3.45
top - 15:25:51 up 1:37, 6 users, load average: 0.04, 1.71, 3.44
top - 15:25:56 up 1:37, 6 users, load average: 0.03, 1.69, 3.42
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-10 11:53 ` Anant Nitya
@ 2007-05-10 21:58 ` Thomas Gleixner
2007-05-17 6:41 ` Anant Nitya
0 siblings, 1 reply; 27+ messages in thread
From: Thomas Gleixner @ 2007-05-10 21:58 UTC (permalink / raw)
To: Anant Nitya; +Cc: linux-kernel
On Thu, 2007-05-10 at 17:23 +0530, Anant Nitya wrote:
> On 5/9/07, Thomas Gleixner <tglx@linutronix.de> wrote:
> > On Wed, 2007-05-09 at 19:42 +0530, Anant Nitya wrote:
> > > Hi,
> > > Ever since I upgrade to 2.6.21/.1, system log is filled with following
> > > messages if I enable CONFIG_NO_HZ=y, going through archives it seems ingo
> > > sometime back posted some patch and now it is upstream, but its not helping
> > > here. If I disable NOHZ by kernel command line nohz=off this problem
> > > disappears. This system is P4/2.40GHz/HT with SMP/SMT on in kernel config.
> > > One more thing that I noticed is this problem only arises while using X or
> > > network otherwise plain command line with no network access don't trigger
> > > this with nohz=on.
> >
> > Is this independent of the load on the system ? i.e. : What happens if
> > you only use the console and run a kernel compile with -j4 ?
> Yep, it seems independent of load on the system, to test I compiled
> kernel with make -j8 and to throw some more load same time I also used
> amavisd to clean around 2000 of spam/virus infected mails and same
> time was listening to few radio stream over net in console only login
> mode. Even then there was not a single NOHZ: local_softirq_pending
> message in log. Once kernel got compiled and amavisd finished its job
> and load drops back to around 0.5/2.0 I started X and within few secs
> log starts getting filled with local_softirq_pending messages, (sorry,
> I didn't applied ratelimit patch since I wanted to test is it high
> load on system that causes this or something else). It seems even
> network operation is not causing this. It seems either X is doing
> something terribly wrong or kernel is getting hosed by X.
> If some more information is needed please feel free to ask
Ok, that's consistent with earlier reports. The problem surfaces when
one of the SMT-"cpus" goes idle. The problem goes away when you disable
hyperthreading.
When you apply the ratelimit patch, does the softlockup problem
persist ?
tglx
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-10 21:58 ` Thomas Gleixner
@ 2007-05-17 6:41 ` Anant Nitya
2007-05-18 13:01 ` Thomas Gleixner
0 siblings, 1 reply; 27+ messages in thread
From: Anant Nitya @ 2007-05-17 6:41 UTC (permalink / raw)
To: tglx; +Cc: linux-kernel
On Friday 11 May 2007 03:28:46 Thomas Gleixner wrote:
> Ok, that's consistent with earlier reports. The problem surfaces when
> one of the SMT-"cpus" goes idle. The problem goes away when you disable
> hyperthreading.
Yes with HT disabled in BIOS there is no local_softirq_pending messages. BTW
why does this problem persist only with X ?
> When you apply the ratelimit patch, does the softlockup problem
> persist ?
>
Yes, though softlockup is rare and mostly hit when system is under high load.
Apart of that I am also getting following messages consistently across
multiple boot cycles with NOHZ=y and ratelimit patch applied.
May 15 11:51:22 rudra kernel: [ 2594.341068] Clocksource tsc unstable (delta =
28111260302 ns)
May 15 11:51:22 rudra kernel: [ 2594.343194] Time: acpi_pm clocksource has
been installed.
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-17 6:41 ` Anant Nitya
@ 2007-05-18 13:01 ` Thomas Gleixner
2007-05-19 4:30 ` Anant Nitya
2007-05-19 9:55 ` Anant Nitya
0 siblings, 2 replies; 27+ messages in thread
From: Thomas Gleixner @ 2007-05-18 13:01 UTC (permalink / raw)
To: Anant Nitya; +Cc: linux-kernel
On Thu, 2007-05-17 at 12:11 +0530, Anant Nitya wrote:
> On Friday 11 May 2007 03:28:46 Thomas Gleixner wrote:
>
> > Ok, that's consistent with earlier reports. The problem surfaces when
> > one of the SMT-"cpus" goes idle. The problem goes away when you disable
> > hyperthreading.
> Yes with HT disabled in BIOS there is no local_softirq_pending messages. BTW
> why does this problem persist only with X ?
No idea. I uploaded a debug patch against 2.6.22-rc1 to
http://www.tglx.de/private/tglx/2.6.22-rc1-hrt-debug.patch
Can you give it a try and report the output ?
> > When you apply the ratelimit patch, does the softlockup problem
> > persist ?
> >
> Yes, though softlockup is rare and mostly hit when system is under high load.
> Apart of that I am also getting following messages consistently across
> multiple boot cycles with NOHZ=y and ratelimit patch applied.
>
> May 15 11:51:22 rudra kernel: [ 2594.341068] Clocksource tsc unstable (delta =
> 28111260302 ns)
> May 15 11:51:22 rudra kernel: [ 2594.343194] Time: acpi_pm clocksource has
> been installed.
That's informal. The TSC is detected to be unstable and replaced by the
pm timer. Nothing to worry about. It happens with NOHZ=n as well,
right ?
tglx
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-18 13:01 ` Thomas Gleixner
@ 2007-05-19 4:30 ` Anant Nitya
2007-05-19 9:55 ` Anant Nitya
1 sibling, 0 replies; 27+ messages in thread
From: Anant Nitya @ 2007-05-19 4:30 UTC (permalink / raw)
To: linux-kernel; +Cc: Thomas Gleixner
On Friday 18 May 2007 18:31:17 Thomas Gleixner wrote:
> On Thu, 2007-05-17 at 12:11 +0530, Anant Nitya wrote:
> > On Friday 11 May 2007 03:28:46 Thomas Gleixner wrote:
> > > Ok, that's consistent with earlier reports. The problem surfaces when
> > > one of the SMT-"cpus" goes idle. The problem goes away when you disable
> > > hyperthreading.
> >
> > Yes with HT disabled in BIOS there is no local_softirq_pending messages.
> > BTW why does this problem persist only with X ?
>
> No idea. I uploaded a debug patch against 2.6.22-rc1 to
>
> http://www.tglx.de/private/tglx/2.6.22-rc1-hrt-debug.patch
>
> Can you give it a try and report the output ?
I am compiling kernel with above patch applied and will post the results.
> > > When you apply the ratelimit patch, does the softlockup problem
> > > persist ?
> >
> > Yes, though softlockup is rare and mostly hit when system is under high
> > load. Apart of that I am also getting following messages consistently
> > across multiple boot cycles with NOHZ=y and ratelimit patch applied.
> >
> > May 15 11:51:22 rudra kernel: [ 2594.341068] Clocksource tsc unstable
> > (delta = 28111260302 ns)
> > May 15 11:51:22 rudra kernel: [ 2594.343194] Time: acpi_pm clocksource
> > has been installed.
>
> That's informal. The TSC is detected to be unstable and replaced by the
> pm timer. Nothing to worry about. It happens with NOHZ=n as well,
> right ?
Nope it don't appear with nohz=no till now across so many boot cycles, it
always appears with nohz!=no.
Regards
Ananitya
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-18 13:01 ` Thomas Gleixner
2007-05-19 4:30 ` Anant Nitya
@ 2007-05-19 9:55 ` Anant Nitya
2007-05-19 19:11 ` Thomas Gleixner
1 sibling, 1 reply; 27+ messages in thread
From: Anant Nitya @ 2007-05-19 9:55 UTC (permalink / raw)
To: linux-kernel; +Cc: Thomas Gleixner
On Friday 18 May 2007 18:31:17 Thomas Gleixner wrote:
> On Thu, 2007-05-17 at 12:11 +0530, Anant Nitya wrote:
> > On Friday 11 May 2007 03:28:46 Thomas Gleixner wrote:
> > > Ok, that's consistent with earlier reports. The problem surfaces when
> > > one of the SMT-"cpus" goes idle. The problem goes away when you disable
> > > hyperthreading.
> >
> > Yes with HT disabled in BIOS there is no local_softirq_pending messages.
> > BTW why does this problem persist only with X ?
>
> No idea. I uploaded a debug patch against 2.6.22-rc1 to
>
> http://www.tglx.de/private/tglx/2.6.22-rc1-hrt-debug.patch
>
> Can you give it a try and report the output ?
Hi
Here it goes
[ 159.646196] NOHZ softirq pending 22 on CPU 0
[ 159.646207] .... task state: 1 00000000
[ 159.646217] .... last caller: __tasklet_schedule
[ 159.646997] NOHZ softirq pending 22 on CPU 0
[ 159.647006] .... task state: 1 00000000
[ 159.647013] .... last caller: __tasklet_schedule
[ 159.647398] NOHZ softirq pending 22 on CPU 0
[ 159.647405] .... task state: 1 00000000
[ 159.647412] .... last caller: __tasklet_schedule
[ 159.647768] NOHZ softirq pending 22 on CPU 0
[ 159.647775] .... task state: 1 00000000
[ 159.647781] .... last caller: __tasklet_schedule
[ 166.285664] NOHZ softirq pending 22 on CPU 0
[ 166.285675] .... task state: 1 00000000
[ 166.285687] .... last caller: raise_softirq
[ 166.286321] NOHZ softirq pending 22 on CPU 0
[ 166.286329] .... task state: 1 00000000
[ 166.286337] .... last caller: raise_softirq
[ 166.286715] NOHZ softirq pending 22 on CPU 0
[ 166.286722] .... task state: 1 00000000
[ 166.286729] .... last caller: raise_softirq
[ 166.287085] NOHZ softirq pending 22 on CPU 0
[ 166.287092] .... task state: 1 00000000
[ 166.287098] .... last caller: raise_softirq
[ 171.512134] NOHZ softirq pending 22 on CPU 0
[ 171.512144] .... task state: 1 00000000
[ 171.512154] .... last caller: __tasklet_schedule
[ 171.512712] NOHZ softirq pending 22 on CPU 0
[ 171.512720] .... task state: 1 00000000
[ 171.512727] .... last caller: __tasklet_schedule
Regards
Ananitya
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-19 9:55 ` Anant Nitya
@ 2007-05-19 19:11 ` Thomas Gleixner
2007-05-19 21:23 ` Anant Nitya
2007-05-20 10:18 ` Heiko Carstens
0 siblings, 2 replies; 27+ messages in thread
From: Thomas Gleixner @ 2007-05-19 19:11 UTC (permalink / raw)
To: Anant Nitya; +Cc: linux-kernel, Ingo Molnar
On Sat, 2007-05-19 at 15:25 +0530, Anant Nitya wrote:
> > No idea. I uploaded a debug patch against 2.6.22-rc1 to
> >
> > http://www.tglx.de/private/tglx/2.6.22-rc1-hrt-debug.patch
> >
> > Can you give it a try and report the output ?
> Hi
> Here it goes
> [ 159.646196] NOHZ softirq pending 22 on CPU 0
> [ 159.646207] .... task state: 1 00000000
1 == TASK_INTERRUPTIBLE, so we know that ksoftirqd was not woken up. At
least it is not a scheduler problem.
I work out a more complex debug patch and pester you to test once I'm
done.
tglx
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-19 19:11 ` Thomas Gleixner
@ 2007-05-19 21:23 ` Anant Nitya
2007-05-20 21:43 ` Thomas Gleixner
2007-05-20 10:18 ` Heiko Carstens
1 sibling, 1 reply; 27+ messages in thread
From: Anant Nitya @ 2007-05-19 21:23 UTC (permalink / raw)
To: linux-kernel; +Cc: Thomas Gleixner, Ingo Molnar
On Sunday 20 May 2007 00:41:08 Thomas Gleixner wrote:
> On Sat, 2007-05-19 at 15:25 +0530, Anant Nitya wrote:
> > > No idea. I uploaded a debug patch against 2.6.22-rc1 to
> > >
> > > http://www.tglx.de/private/tglx/2.6.22-rc1-hrt-debug.patch
> > >
> > > Can you give it a try and report the output ?
> >
> > Hi
> > Here it goes
> > [ 159.646196] NOHZ softirq pending 22 on CPU 0
> > [ 159.646207] .... task state: 1 00000000
>
> 1 == TASK_INTERRUPTIBLE, so we know that ksoftirqd was not woken up. At
> least it is not a scheduler problem.
>
> I work out a more complex debug patch and pester you to test once I'm
> done.
No problem :)
Regards
Ananitya
>
> tglx
--
Out of many thousands, one may endeavor for perfection, and of
those who have achieved perfection, hardly one knows Me in truth.
-- Gita Sutra Of Mysticism
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-19 19:11 ` Thomas Gleixner
2007-05-19 21:23 ` Anant Nitya
@ 2007-05-20 10:18 ` Heiko Carstens
2007-05-20 13:52 ` Thomas Gleixner
1 sibling, 1 reply; 27+ messages in thread
From: Heiko Carstens @ 2007-05-20 10:18 UTC (permalink / raw)
To: Thomas Gleixner; +Cc: Anant Nitya, linux-kernel, Ingo Molnar
On Sat, May 19, 2007 at 09:11:08PM +0200, Thomas Gleixner wrote:
> On Sat, 2007-05-19 at 15:25 +0530, Anant Nitya wrote:
> > > No idea. I uploaded a debug patch against 2.6.22-rc1 to
> > >
> > > http://www.tglx.de/private/tglx/2.6.22-rc1-hrt-debug.patch
> > >
> > > Can you give it a try and report the output ?
> > Hi
> > Here it goes
> > [ 159.646196] NOHZ softirq pending 22 on CPU 0
> > [ 159.646207] .... task state: 1 00000000
>
> 1 == TASK_INTERRUPTIBLE, so we know that ksoftirqd was not woken up. At
> least it is not a scheduler problem.
>
> I work out a more complex debug patch and pester you to test once I'm
> done.
I've also tons of 'NOHZ: local_softirq_pending 08' that disappear with
nohz=off. But I'm still running 2.6.21. Are there any patches that should
fix this?
Machine is a Lenovo T60p:
i686 Intel(R) Core(TM)2 CPU T7600 @ 2.33GHz GenuineIntel GNU/Linux
Besides that I get a lot of clock skews on 'make headers_check', but
these are unrelated to nohz:
CHECK include/asm/dasd.h
make[2]: warning: Clock skew detected. Your build may be incomplete.
make[2]: Warning: File `/dev/null' has modification time 5.1e+03 s in the future
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-20 10:18 ` Heiko Carstens
@ 2007-05-20 13:52 ` Thomas Gleixner
2007-05-20 18:36 ` Heiko Carstens
0 siblings, 1 reply; 27+ messages in thread
From: Thomas Gleixner @ 2007-05-20 13:52 UTC (permalink / raw)
To: Heiko Carstens; +Cc: Anant Nitya, linux-kernel, Ingo Molnar
On Sun, 2007-05-20 at 12:18 +0200, Heiko Carstens wrote:
> > I work out a more complex debug patch and pester you to test once I'm
> > done.
>
> I've also tons of 'NOHZ: local_softirq_pending 08' that disappear with
> nohz=off. But I'm still running 2.6.21. Are there any patches that should
> fix this?
> Machine is a Lenovo T60p:
>
> i686 Intel(R) Core(TM)2 CPU T7600 @ 2.33GHz GenuineIntel GNU/Linux
Hmm, that's a different problem than the 0x22 which shows up on
hyperthreading enabled P4 systems. Are you using plip ?
> Besides that I get a lot of clock skews on 'make headers_check', but
> these are unrelated to nohz:
>
> CHECK include/asm/dasd.h
> make[2]: warning: Clock skew detected. Your build may be incomplete.
> make[2]: Warning: File `/dev/null' has modification time 5.1e+03 s in the future
Strange.
tglx
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-20 13:52 ` Thomas Gleixner
@ 2007-05-20 18:36 ` Heiko Carstens
[not found] ` <20070520191800.GA14225@osiris.ibm.com>
0 siblings, 1 reply; 27+ messages in thread
From: Heiko Carstens @ 2007-05-20 18:36 UTC (permalink / raw)
To: Thomas Gleixner; +Cc: Anant Nitya, linux-kernel, Ingo Molnar
On Sun, May 20, 2007 at 03:52:21PM +0200, Thomas Gleixner wrote:
> On Sun, 2007-05-20 at 12:18 +0200, Heiko Carstens wrote:
> > > I work out a more complex debug patch and pester you to test once I'm
> > > done.
> >
> > I've also tons of 'NOHZ: local_softirq_pending 08' that disappear with
> > nohz=off. But I'm still running 2.6.21. Are there any patches that should
> > fix this?
> > Machine is a Lenovo T60p:
> >
> > i686 Intel(R) Core(TM)2 CPU T7600 @ 2.33GHz GenuineIntel GNU/Linux
>
> Hmm, that's a different problem than the 0x22 which shows up on
> hyperthreading enabled P4 systems. Are you using plip ?
No, after all it turned out that is caused by an IBM internal module.
Just ignore me, sorry for the noise :)
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-19 21:23 ` Anant Nitya
@ 2007-05-20 21:43 ` Thomas Gleixner
2007-05-21 6:22 ` Anant Nitya
2007-05-22 19:03 ` Michal Piotrowski
0 siblings, 2 replies; 27+ messages in thread
From: Thomas Gleixner @ 2007-05-20 21:43 UTC (permalink / raw)
To: Anant Nitya; +Cc: linux-kernel, Ingo Molnar, Michal Piotrowski
On Sun, 2007-05-20 at 02:53 +0530, Anant Nitya wrote:
> > 1 == TASK_INTERRUPTIBLE, so we know that ksoftirqd was not woken up. At
> > least it is not a scheduler problem.
> >
> > I work out a more complex debug patch and pester you to test once I'm
> > done.
> No problem :)
You asked for it :)
Please patch 2.6.22-rc2 with
http://tglx.de/projects/hrtimers/2.6.22-rc2/patch-2.6.22-rc2-hrt2.patch
and
http://www.tglx.de/private/tglx/ht-debug/tracer.diff
Compile it with the config
http://www.tglx.de/private/tglx/ht-debug/config.debug
You should find something like:
( swapper-0 |#0): new 67173 us user-latency.
along with the familiar "NOHZ ......" message in your log file.
Once that happened please do:
$ cat /proc/latency_trace >trace.txt
compress it and send it to me along with the full dmesg output or put
both up to some place, where I can download it.
Michal,
IIRC you encountered the same P4/HT related wreckage. Can you do the
same ?
Thanks,
tglx
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-20 21:43 ` Thomas Gleixner
@ 2007-05-21 6:22 ` Anant Nitya
2007-05-21 9:01 ` Thomas Gleixner
2007-05-22 19:03 ` Michal Piotrowski
1 sibling, 1 reply; 27+ messages in thread
From: Anant Nitya @ 2007-05-21 6:22 UTC (permalink / raw)
To: linux-kernel; +Cc: Thomas Gleixner, Ingo Molnar, Michal Piotrowski
On Monday 21 May 2007 03:13:08 Thomas Gleixner wrote:
> On Sun, 2007-05-20 at 02:53 +0530, Anant Nitya wrote:
> > > 1 == TASK_INTERRUPTIBLE, so we know that ksoftirqd was not woken up. At
> > > least it is not a scheduler problem.
> > >
> > > I work out a more complex debug patch and pester you to test once I'm
> > > done.
> >
> > No problem :)
>
> You asked for it :)
>
> Please patch 2.6.22-rc2 with
>
> http://tglx.de/projects/hrtimers/2.6.22-rc2/patch-2.6.22-rc2-hrt2.patch
> and
> http://www.tglx.de/private/tglx/ht-debug/tracer.diff
>
> Compile it with the config
>
> http://www.tglx.de/private/tglx/ht-debug/config.debug
>
> You should find something like:
>
> ( swapper-0 |#0): new 67173 us user-latency.
>
> along with the familiar "NOHZ ......" message in your log file.
>
> Once that happened please do:
>
> $ cat /proc/latency_trace >trace.txt
>
> compress it and send it to me along with the full dmesg output or put
> both up to some place, where I can download it.
Hi Thomas
Here are the links...
http://cybertek.info/taitai/dmesg-2.6.22.rc2.hrt2-1.SMP.DN.LINUX.txt
http://cybertek.info/taitai/trace.txt.bz2
Regards
Ananitya
>
> Michal,
>
> IIRC you encountered the same P4/HT related wreckage. Can you do the
> same ?
>
> Thanks,
>
> tglx
--
Out of many thousands, one may endeavor for perfection, and of
those who have achieved perfection, hardly one knows Me in truth.
-- Gita Sutra Of Mysticism
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-21 6:22 ` Anant Nitya
@ 2007-05-21 9:01 ` Thomas Gleixner
2007-05-21 10:02 ` Anant Nitya
2007-05-21 18:45 ` Anant Nitya
0 siblings, 2 replies; 27+ messages in thread
From: Thomas Gleixner @ 2007-05-21 9:01 UTC (permalink / raw)
To: Anant Nitya; +Cc: linux-kernel, Ingo Molnar, Michal Piotrowski
On Mon, 2007-05-21 at 11:52 +0530, Anant Nitya wrote:
> > You should find something like:
> >
> > ( swapper-0 |#0): new 67173 us user-latency.
> >
> > along with the familiar "NOHZ ......" message in your log file.
> >
> > Once that happened please do:
> >
> > $ cat /proc/latency_trace >trace.txt
> >
> > compress it and send it to me along with the full dmesg output or put
> > both up to some place, where I can download it.
> Hi Thomas
>
> Here are the links...
> http://cybertek.info/taitai/dmesg-2.6.22.rc2.hrt2-1.SMP.DN.LINUX.txt
> http://cybertek.info/taitai/trace.txt.bz2
Thanks. Sorry, I need more info. I uploaded a new tracer.diff to
http://www.tglx.de/private/tglx/ht-debug/tracer.diff
Can you please revert the first one and retest with the new one ?
Thanks,
tglx
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-21 9:01 ` Thomas Gleixner
@ 2007-05-21 10:02 ` Anant Nitya
2007-05-21 18:45 ` Anant Nitya
1 sibling, 0 replies; 27+ messages in thread
From: Anant Nitya @ 2007-05-21 10:02 UTC (permalink / raw)
To: linux-kernel; +Cc: Thomas Gleixner, Ingo Molnar, Michal Piotrowski
On Monday 21 May 2007 14:31:57 Thomas Gleixner wrote:
> On Mon, 2007-05-21 at 11:52 +0530, Anant Nitya wrote:
> > > You should find something like:
> > >
> > > ( swapper-0 |#0): new 67173 us user-latency.
> > >
> > > along with the familiar "NOHZ ......" message in your log file.
> > >
> > > Once that happened please do:
> > >
> > > $ cat /proc/latency_trace >trace.txt
> > >
> > > compress it and send it to me along with the full dmesg output or put
> > > both up to some place, where I can download it.
> >
> > Hi Thomas
> >
> > Here are the links...
> > http://cybertek.info/taitai/dmesg-2.6.22.rc2.hrt2-1.SMP.DN.LINUX.txt
> > http://cybertek.info/taitai/trace.txt.bz2
>
> Thanks. Sorry, I need more info. I uploaded a new tracer.diff to
>
> http://www.tglx.de/private/tglx/ht-debug/tracer.diff
>
> Can you please revert the first one and retest with the new one ?
Okay sure, compiling now.
Regards
Ananitya
>
> Thanks,
>
> tglx
--
Out of many thousands, one may endeavor for perfection, and of
those who have achieved perfection, hardly one knows Me in truth.
-- Gita Sutra Of Mysticism
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-21 9:01 ` Thomas Gleixner
2007-05-21 10:02 ` Anant Nitya
@ 2007-05-21 18:45 ` Anant Nitya
1 sibling, 0 replies; 27+ messages in thread
From: Anant Nitya @ 2007-05-21 18:45 UTC (permalink / raw)
To: linux-kernel; +Cc: Thomas Gleixner, Ingo Molnar, Michal Piotrowski
On Monday 21 May 2007 14:31:57 Thomas Gleixner wrote:
> On Mon, 2007-05-21 at 11:52 +0530, Anant Nitya wrote:
> > > You should find something like:
> > >
> > > ( swapper-0 |#0): new 67173 us user-latency.
> > >
> > > along with the familiar "NOHZ ......" message in your log file.
> > >
> > > Once that happened please do:
> > >
> > > $ cat /proc/latency_trace >trace.txt
> > >
> > > compress it and send it to me along with the full dmesg output or put
> > > both up to some place, where I can download it.
> >
> > Hi Thomas
> >
> > Here are the links...
> > http://cybertek.info/taitai/dmesg-2.6.22.rc2.hrt2-1.SMP.DN.LINUX.txt
> > http://cybertek.info/taitai/trace.txt.bz2
>
> Thanks. Sorry, I need more info. I uploaded a new tracer.diff to
>
> http://www.tglx.de/private/tglx/ht-debug/tracer.diff
>
> Can you please revert the first one and retest with the new one ?
>
> Thanks,
Sorry for delay, here is link for output from new tacer.
http://cybertek.info/taitai/trace-new.txt.bz2
Regards
Ananitya
>
> tglx
--
Out of many thousands, one may endeavor for perfection, and of
those who have achieved perfection, hardly one knows Me in truth.
-- Gita Sutra Of Mysticism
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-20 21:43 ` Thomas Gleixner
2007-05-21 6:22 ` Anant Nitya
@ 2007-05-22 19:03 ` Michal Piotrowski
2007-05-22 19:59 ` Michal Piotrowski
2007-05-22 20:10 ` Ingo Molnar
1 sibling, 2 replies; 27+ messages in thread
From: Michal Piotrowski @ 2007-05-22 19:03 UTC (permalink / raw)
To: Thomas Gleixner; +Cc: Anant Nitya, linux-kernel, Ingo Molnar
Hi Thomas,
On 20/05/07, Thomas Gleixner <tglx@linutronix.de> wrote:
> On Sun, 2007-05-20 at 02:53 +0530, Anant Nitya wrote:
> > > 1 == TASK_INTERRUPTIBLE, so we know that ksoftirqd was not woken up. At
> > > least it is not a scheduler problem.
> > >
> > > I work out a more complex debug patch and pester you to test once I'm
> > > done.
> > No problem :)
>
> You asked for it :)
>
> Please patch 2.6.22-rc2 with
>
> http://tglx.de/projects/hrtimers/2.6.22-rc2/patch-2.6.22-rc2-hrt2.patch
> and
> http://www.tglx.de/private/tglx/ht-debug/tracer.diff
>
> Compile it with the config
>
> http://www.tglx.de/private/tglx/ht-debug/config.debug
>
> You should find something like:
>
> ( swapper-0 |#0): new 67173 us user-latency.
>
> along with the familiar "NOHZ ......" message in your log file.
>
> Once that happened please do:
>
> $ cat /proc/latency_trace >trace.txt
>
> compress it and send it to me along with the full dmesg output or put
> both up to some place, where I can download it.
>
> Michal,
>
> IIRC you encountered the same P4/HT related wreckage. Can you do the
> same ?
Good news - I can't reproduce this bug. It's time to remove
"Subject : 2.6.21-git4 BUG: soft lockup detected on CPU#1!
References : http://lkml.org/lkml/2007/5/2/511
Submitter : Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Handled-By : Thomas Gleixner <tglx@linutronix.de>
Status : problem is being debugged"
from KR.
Bad news - I hit a bug in 2.6.22-rc2-hrt3. Bug symptoms:
- X hangs (keyboard, mouse, sound etc.)
- only Magic SysRq works
http://www.stardust.webpages.pl/files/tbf/bitis-gabonica/2.6.22-rc2-hrt3/hrt-config
http://www.stardust.webpages.pl/files/tbf/bitis-gabonica/2.6.22-rc2-hrt3/hrt-console.log
Now I'm trying to apply hrtimers debug patch ontop 2.6.22-rc2-hrt3
http://lkml.org/lkml/2007/3/23/106
Regards,
Michal
--
Michal K. K. Piotrowski
Kernel Monkeys
(http://kernel.wikidot.com/start)
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-22 19:03 ` Michal Piotrowski
@ 2007-05-22 19:59 ` Michal Piotrowski
2007-05-22 20:10 ` Ingo Molnar
1 sibling, 0 replies; 27+ messages in thread
From: Michal Piotrowski @ 2007-05-22 19:59 UTC (permalink / raw)
To: Thomas Gleixner; +Cc: Anant Nitya, linux-kernel, Ingo Molnar
Michal Piotrowski napisał(a):
> Hi Thomas,
>
> On 20/05/07, Thomas Gleixner <tglx@linutronix.de> wrote:
>> On Sun, 2007-05-20 at 02:53 +0530, Anant Nitya wrote:
>> > > 1 == TASK_INTERRUPTIBLE, so we know that ksoftirqd was not woken
>> up. At
>> > > least it is not a scheduler problem.
>> > >
>> > > I work out a more complex debug patch and pester you to test once I'm
>> > > done.
>> > No problem :)
>>
>> You asked for it :)
>>
>> Please patch 2.6.22-rc2 with
>>
>> http://tglx.de/projects/hrtimers/2.6.22-rc2/patch-2.6.22-rc2-hrt2.patch
>> and
>> http://www.tglx.de/private/tglx/ht-debug/tracer.diff
>>
>> Compile it with the config
>>
>> http://www.tglx.de/private/tglx/ht-debug/config.debug
>>
>> You should find something like:
>>
>> ( swapper-0 |#0): new 67173 us user-latency.
>>
>> along with the familiar "NOHZ ......" message in your log file.
>>
>> Once that happened please do:
>>
>> $ cat /proc/latency_trace >trace.txt
>>
>> compress it and send it to me along with the full dmesg output or put
>> both up to some place, where I can download it.
>>
>> Michal,
>>
>> IIRC you encountered the same P4/HT related wreckage. Can you do the
>> same ?
>
> Good news - I can't reproduce this bug. It's time to remove
> "Subject : 2.6.21-git4 BUG: soft lockup detected on CPU#1!
> References : http://lkml.org/lkml/2007/5/2/511
> Submitter : Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
> Handled-By : Thomas Gleixner <tglx@linutronix.de>
> Status : problem is being debugged"
> from KR.
>
> Bad news - I hit a bug in 2.6.22-rc2-hrt3. Bug symptoms:
> - X hangs (keyboard, mouse, sound etc.)
> - only Magic SysRq works
>
> http://www.stardust.webpages.pl/files/tbf/bitis-gabonica/2.6.22-rc2-hrt3/hrt-config
>
> http://www.stardust.webpages.pl/files/tbf/bitis-gabonica/2.6.22-rc2-hrt3/hrt-console.log
>
>
> Now I'm trying to apply hrtimers debug patch ontop 2.6.22-rc2-hrt3
> http://lkml.org/lkml/2007/3/23/106
>
It _almost_ works
http://www.stardust.webpages.pl/files/tbf/bitis-gabonica/2.6.22-rc2-hrt3/hrtimers_debug.patch
Hmmm..
[ 135.206505] SysRq : Show Pending Timers
[ 135.210476] Timer List Version: v0.3
[ 135.214102] HRTIMER_MAX_CLOCK_BASES: 2
[ 135.217899] now at 112955954742 nsecs
[ 135.221651]
[ 135.221662] cpu: 0
[ 135.225246] clock 0:
[ 135.227588] .index: 0
[ 135.230545] .resolution: 1 nsecs
[ 135.234010] .get_time: ktime_get_real
[ 135.238151] .offset: 1179862680097808665 nsecs
[ 135.243207] active timers:
[ 135.245992] clock 1:
[ 135.248316] .index: 1
[ 135.251246] .resolution: 1 nsecs
[ 135.254722] .get_time: ktime_get
[ 135.258473] .offset: 0 nsecs
[ 135.261923] active timers:
[ 135.264683] #0: hardirq_stack, tick_sched_timer, S:01, tick_nohz_restart_sched_tick, swapper/0
[ 135.273913] # expires at 112952000000 nsecs [in 18446744073705596874 nsecs]
[ 135.281194] #1: hardirq_stack, hrtimer_wakeup, S:01, futex_wait, automount/2293
[ 135.289057] # expires at 113902202172 nsecs [in 946247430 nsecs]
[ 135.295233] #2: hardirq_stack, hrtimer_wakeup, S:01, do_nanosleep, crond/2373
[ 135.302973] # expires at 121028637388 nsecs [in 8072682646 nsecs]
[ 135.309279] #3: hardirq_stack, it_real_fn, S:01, do_setitimer, syslogd/2171
[ 135.316701] # expires at 121465401717 nsecs [in 8509446975 nsecs]
[ 135.323035] .expires_next : 112952000000 nsecs
[ 135.327921] .exp_prev : 112951000000 nsecs
[ 135.332786] last expires_next stacktrace:
[ 135.336944] update_cpu_base_expires_next
[ 135.341188] hrtimer_interrupt
[ 135.344430] smp_apic_timer_interrupt
[ 135.348310] apic_timer_interrupt
[ 135.351845] __mcount
[ 135.354327] mcount
[ 135.356627] permission
[ 135.359298] vfs_permission
[ 135.362305] __link_path_walk
[ 135.365497] link_path_walk
[ 135.368486] path_walk
[ 135.371044] do_path_lookup
[ 135.374086] __user_walk_fd
[ 135.377122] vfs_stat_fd
[ 135.379905] vfs_stat
[ 135.382385] sys_stat64
[ 135.385065] syscall_call
[ 135.387909] <3>BUG: sleeping function called from invalid context at kernel/mutex.c:86
[ 135.396175] in_atomic():1, irqs_disabled():1
[ 135.400541] 2 locks held by readahead/2442:
[ 135.404783] #0: (&serio->lock){++..}, at: [<c02dbf17>] serio_interrupt+0x22/0x79
[ 135.412623] #1: (sysrq_key_table_lock){+...}, at: [<c027a4af>] __handle_sysrq+0x1b/0x10c
[ 135.421208] irq event stamp: 3249062
[ 135.424856] hardirqs last enabled at (3249061): [<c0181b67>] kmem_cache_free+0x97/0xa1
[ 135.433050] hardirqs last disabled at (3249062): [<c0104bd4>] common_interrupt+0x24/0x34
[ 135.441350] softirqs last enabled at (3248980): [<c012a418>] __do_softirq+0xe8/0xef
[ 135.449261] softirqs last disabled at (3248975): [<c0106df7>] do_softirq+0x69/0xd6
[ 135.457049] [<c010526c>] show_trace_log_lvl+0x35/0x54
[ 135.462312] [<c0106027>] show_trace+0x2c/0x2e
[ 135.466876] [<c01060d0>] dump_stack+0x29/0x2b
[ 135.471423] [<c011de0c>] __might_sleep+0xe0/0xe2
[ 135.476221] [<c0360257>] mutex_lock+0x22/0x2e
[ 135.480767] [<c014eb96>] lookup_module_symbol_name+0x1a/0xc4
[ 135.486739] [<c014f514>] lookup_symbol_name+0x62/0x69
[ 135.492021] [<c013eb45>] print_name_offset+0x29/0x81
[ 135.497200] [<c013f4c5>] timer_list_show+0x657/0xc55
[ 135.502368] [<c013fae2>] sysrq_timer_list_show+0x1f/0x21
[ 135.507859] [<c027a5fd>] sysrq_handle_show_timers+0xd/0xf
[ 135.513451] [<c027a525>] __handle_sysrq+0x91/0x10c
[ 135.518507] [<c027a79e>] handle_sysrq+0x37/0x39
[ 135.523296] [<c0274b00>] kbd_event+0x335/0x58d
[ 135.527921] [<c02df806>] input_event+0x43e/0x460
[ 135.532718] [<c02e3766>] atkbd_interrupt+0x467/0x58d
[ 135.537887] [<c02dbf37>] serio_interrupt+0x42/0x79
[ 135.542865] [<c02dceed>] i8042_interrupt+0x1ff/0x210
[ 135.548130] [<c0160963>] handle_IRQ_event+0x24/0x54
[ 135.553187] [<c0161b2a>] handle_edge_irq+0xd7/0x11f
[ 135.558253] [<c0106f46>] do_IRQ+0xe2/0x10c
[ 135.562544] [<c0104bde>] common_interrupt+0x2e/0x34
[ 135.567675] [<c0116134>] mcount+0x14/0x18
[ 135.571858] [<c019b9ab>] mntput_no_expire+0xd/0x89
[ 135.576845] [<c018cd6a>] path_release+0x2f/0x33
[ 135.581645] [<c01893f4>] vfs_stat_fd+0x4c/0x55
[ 135.586276] [<c01894c9>] vfs_stat+0x25/0x27
[ 135.590660] [<c01894e9>] sys_stat64+0x1e/0x37
[ 135.595215] [<c01041f5>] syscall_call+0x7/0xb
[ 135.599752] =======================
[ 135.603365] ---------------------------
[ 135.607229] | preempt count: 00010000 ]
[ 135.611146] | 0-level deep critical section nesting:
[ 135.616202] ----------------------------------------
[ 135.621258]
[ 135.795930] ( readahead-2442 |#0): new 112512428 us user-latency.
[ 135.802591] stopped custom tracer.
[ 135.806058] BUG: at kernel/mutex.c:132 __mutex_lock_common()
[ 135.811824] [<c010526c>] show_trace_log_lvl+0x35/0x54
[ 135.817035] [<c0106027>] show_trace+0x2c/0x2e
[ 135.821557] [<c01060d0>] dump_stack+0x29/0x2b
[ 135.826078] [<c035fff2>] __mutex_lock_slowpath+0x64/0x2a7
[ 135.831714] [<c036025e>] mutex_lock+0x29/0x2e
[ 135.836277] [<c014eb96>] lookup_module_symbol_name+0x1a/0xc4
[ 135.842121] [<c014f514>] lookup_symbol_name+0x62/0x69
[ 135.847342] [<c013eb45>] print_name_offset+0x29/0x81
[ 135.852478] [<c013f4c5>] timer_list_show+0x657/0xc55
[ 135.857611] [<c013fae2>] sysrq_timer_list_show+0x1f/0x21
[ 135.863128] [<c027a5fd>] sysrq_handle_show_timers+0xd/0xf
[ 135.868744] [<c027a525>] __handle_sysrq+0x91/0x10c
[ 135.873689] [<c027a79e>] handle_sysrq+0x37/0x39
[ 135.878383] [<c0274b00>] kbd_event+0x335/0x58d
[ 135.882991] [<c02df806>] input_event+0x43e/0x460
[ 135.887806] [<c02e3766>] atkbd_interrupt+0x467/0x58d
[ 135.892948] [<c02dbf37>] serio_interrupt+0x42/0x79
[ 135.897918] [<c02dceed>] i8042_interrupt+0x1ff/0x210
[ 135.903053] [<c0160963>] handle_IRQ_event+0x24/0x54
[ 135.908120] [<c0161b2a>] handle_edge_irq+0xd7/0x11f
[ 135.913176] [<c0106f46>] do_IRQ+0xe2/0x10c
[ 135.917449] [<c0104bde>] common_interrupt+0x2e/0x34
[ 135.922502] [<c0116134>] mcount+0x14/0x18
[ 135.926696] [<c019b9ab>] mntput_no_expire+0xd/0x89
[ 135.931657] [<c018cd6a>] path_release+0x2f/0x33
[ 135.936378] [<c01893f4>] vfs_stat_fd+0x4c/0x55
[ 135.941001] [<c01894c9>] vfs_stat+0x25/0x27
[ 135.945376] [<c01894e9>] sys_stat64+0x1e/0x37
[ 135.949931] [<c01041f5>] syscall_call+0x7/0xb
[ 135.954467] =======================
[ 135.958091] ---------------------------
[ 135.962015] | preempt count: 00010000 ]
[ 135.965905] | 0-level deep critical section nesting:
[ 135.970927] ----------------------------------------
[ 135.975931]
[ 135.977468] <ffffffff>
[ 135.979865]
[ 135.981396] .hres_active : 1
[ 135.984757] .nr_events : 91663
[ 135.988465] .nohz_mode : 2
[ 135.991820] .idle_tick : 112686000000 nsecs
[ 135.996651] .tick_stopped : 0
[ 136.000016] .idle_jiffies : 4294779982
[ 136.004190] .idle_calls : 30792
[ 136.007882] .idle_sleeps : 3020
[ 136.011486] .idle_entrytime : 112932690671 nsecs
[ 136.016335] .idle_sleeptime : 18007304053 nsecs
[ 136.021063] .last_jiffies : 4294780229
[ 136.025220] .next_jiffies : 4294780556
[ 136.029352] .idle_expires : 112855000000 nsecs
[ 136.034167] jiffies: 4294780248
[ 136.037331]
[ 136.037336] cpu: 1
[ 136.040884] clock 0:
[ 136.043182] .index: 0
[ 136.046087] .resolution: 1 nsecs
[ 136.049535] .get_time: ktime_get_real
[ 136.053739] .offset: 1179862680097808665 nsecs
[ 136.058751] active timers:
[ 136.061501] clock 1:
[ 136.063877] .index: 1
[ 136.066781] .resolution: 1 nsecs
[ 136.070229] .get_time: ktime_get
[ 136.073922] .offset: 0 nsecs
[ 136.077465] active timers:
[ 136.080293] #0: hardirq_stack, tick_sched_timer, S:01, tick_nohz_restart_sched_tick, swapper/0
[ 136.089309] # expires at 113828250000 nsecs [in 872295258 nsecs]
[ 136.095654] #1: hardirq_stack, hrtimer_wakeup, S:01, futex_wait, automount/2294
[ 136.103356] # expires at 113902196736 nsecs [in 946241994 nsecs]
[ 136.109485] #2: hardirq_stack, hrtimer_wakeup, S:01, do_nanosleep, smartd/2640
[ 136.117101] # expires at 1897330250564 nsecs [in 1784374295822 nsecs]
[ 136.123723] .expires_next : 113871250000 nsecs
[ 136.128726] .exp_prev : 113875250000 nsecs
[ 136.133558] last expires_next stacktrace:
[ 136.137662] update_cpu_base_expires_next
[ 136.141838] hrtimer_interrupt
[ 136.145071] smp_apic_timer_interrupt
[ 136.148935] apic_timer_interrupt
[ 136.152419] cpu_idle
[ 136.154890] start_secondary
[ 136.157967] <00000000>
[ 136.160639] <ffffffff>
[ 136.163267]
[ 136.164789] .hres_active : 1
[ 136.168143] .nr_events : 85123
[ 136.171981] .nohz_mode : 2
[ 136.175344] .idle_tick : 112682250000 nsecs
[ 136.180281] .tick_stopped : 0
[ 136.183737] .idle_jiffies : 4294779978
[ 136.187974] .idle_calls : 44643
[ 136.191708] .idle_sleeps : 1384
[ 136.195424] .idle_entrytime : 113942257992 nsecs
[ 136.200421] .idle_sleeptime : 18596870874 nsecs
[ 136.205158] .last_jiffies : 4294780248
[ 136.209316] .next_jiffies : 4294780261
[ 136.213595] .idle_expires : 112778000000 nsecs
[ 136.218451] jiffies: 4294780248
[ 136.221650]
[ 136.223163]
[ 136.223168] Tick Device: mode: 1
[ 136.228383] Clock Event Device: pit
[ 136.231928] max_delta_ns: 27461866
[ 136.235636] min_delta_ns: 12571
[ 136.239172] mult: 5124677
[ 136.242769] shift: 32
[ 136.245965] mode: 3
[ 136.249095] next_event: 9223372036854775807 nsecs
[ 136.254282] set_next_event: pit_next_event
[ 136.258613] set_mode: init_pit_timer
[ 136.262908] event_handler: tick_handle_oneshot_broadcast
[ 136.268510] tick_broadcast_mask: 00000000
[ 136.272583] tick_broadcast_oneshot_mask: 00000000
[ 136.277310]
[ 136.278840]
[ 136.278845] Tick Device: mode: 1
[ 136.284086] Clock Event Device: lapic
[ 136.287803] max_delta_ns: 671411430
[ 136.291615] min_delta_ns: 1200
[ 136.294977] mult: 53661274
[ 136.298668] shift: 32
[ 136.301902] mode: 3
[ 136.304971] next_event: 112952000000 nsecs
[ 136.309638] set_next_event: lapic_next_event
[ 136.314177] set_mode: lapic_timer_setup
[ 136.318680] event_handler: hrtimer_interrupt
[ 136.323236]
[ 136.323241] Tick Device: mode: 1
[ 136.328404] Clock Event Device: lapic
[ 136.332191] max_delta_ns: 671411430
[ 136.335977] min_delta_ns: 1200
[ 136.339367] mult: 53661274
[ 136.343075] shift: 32
[ 136.346268] mode: 3
[ 136.349375] next_event: 114098250000 nsecs
[ 136.353914] set_next_event: lapic_next_event
[ 136.358357] set_mode: lapic_timer_setup
[ 136.362973] event_handler: hrtimer_interrupt
Regards,
Michal
--
Michal K. K. Piotrowski
Kernel Monkeys
(http://kernel.wikidot.com/start)
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-22 19:03 ` Michal Piotrowski
2007-05-22 19:59 ` Michal Piotrowski
@ 2007-05-22 20:10 ` Ingo Molnar
2007-05-22 20:23 ` Michal Piotrowski
2007-05-23 17:00 ` Chuck Ebbert
1 sibling, 2 replies; 27+ messages in thread
From: Ingo Molnar @ 2007-05-22 20:10 UTC (permalink / raw)
To: Michal Piotrowski; +Cc: Thomas Gleixner, Anant Nitya, linux-kernel
* Michal Piotrowski <michal.k.k.piotrowski@gmail.com> wrote:
> Bad news - I hit a bug in 2.6.22-rc2-hrt3. Bug symptoms:
> - X hangs (keyboard, mouse, sound etc.)
> - only Magic SysRq works
please try the patch below! I think we have nailed this bug.
Ingo
Index: linux/kernel/sched.c
===================================================================
--- linux.orig/kernel/sched.c
+++ linux/kernel/sched.c
@@ -4212,9 +4212,7 @@ int __sched cond_resched_softirq(void)
BUG_ON(!in_softirq());
if (need_resched() && system_state == SYSTEM_RUNNING) {
- raw_local_irq_disable();
- _local_bh_enable();
- raw_local_irq_enable();
+ local_bh_enable();
__cond_resched();
local_bh_disable();
return 1;
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-22 20:10 ` Ingo Molnar
@ 2007-05-22 20:23 ` Michal Piotrowski
2007-05-23 17:00 ` Chuck Ebbert
1 sibling, 0 replies; 27+ messages in thread
From: Michal Piotrowski @ 2007-05-22 20:23 UTC (permalink / raw)
To: Ingo Molnar; +Cc: Thomas Gleixner, Anant Nitya, linux-kernel
On 22/05/07, Ingo Molnar <mingo@elte.hu> wrote:
>
> * Michal Piotrowski <michal.k.k.piotrowski@gmail.com> wrote:
>
> > Bad news - I hit a bug in 2.6.22-rc2-hrt3. Bug symptoms:
> > - X hangs (keyboard, mouse, sound etc.)
> > - only Magic SysRq works
>
> please try the patch below! I think we have nailed this bug.
I picked it from -hrt5 and so far so good.
Regards,
Michal
--
Michal K. K. Piotrowski
Kernel Monkeys
(http://kernel.wikidot.com/start)
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-22 20:10 ` Ingo Molnar
2007-05-22 20:23 ` Michal Piotrowski
@ 2007-05-23 17:00 ` Chuck Ebbert
2007-05-23 18:38 ` Chuck Ebbert
2007-05-24 7:45 ` Ingo Molnar
1 sibling, 2 replies; 27+ messages in thread
From: Chuck Ebbert @ 2007-05-23 17:00 UTC (permalink / raw)
To: Ingo Molnar
Cc: Michal Piotrowski, Thomas Gleixner, Anant Nitya, linux-kernel,
David Miller
Ingo Molnar wrote:
> * Michal Piotrowski <michal.k.k.piotrowski@gmail.com> wrote:
>
>> Bad news - I hit a bug in 2.6.22-rc2-hrt3. Bug symptoms:
>> - X hangs (keyboard, mouse, sound etc.)
>> - only Magic SysRq works
>
> please try the patch below! I think we have nailed this bug.
>
> Ingo
>
> Index: linux/kernel/sched.c
> ===================================================================
> --- linux.orig/kernel/sched.c
> +++ linux/kernel/sched.c
> @@ -4212,9 +4212,7 @@ int __sched cond_resched_softirq(void)
> BUG_ON(!in_softirq());
>
> if (need_resched() && system_state == SYSTEM_RUNNING) {
> - raw_local_irq_disable();
> - _local_bh_enable();
> - raw_local_irq_enable();
> + local_bh_enable();
> __cond_resched();
> local_bh_disable();
> return 1;
We may have a problem with that:
BUG: warning at kernel/softirq.c:138/local_bh_enable() (Not tainted)
[<c042b2ef>] local_bh_enable+0x45/0x92
[<c06036b7>] cond_resched_softirq+0x2c/0x42
[<c059d5d0>] release_sock+0x54/0xa3
[<c05c9428>] tcp_sendmsg+0x91b/0xa0c
[<c05e1bb9>] inet_sendmsg+0x3b/0x45
[<c059af34>] sock_aio_write+0xf9/0x105
[<c0476035>] do_sync_write+0xc7/0x10a
[<c0437265>] autoremove_wake_function+0x0/0x35
[<c047688e>] vfs_write+0xbc/0x154
[<c0476e8c>] sys_write+0x41/0x67
[<c0404f70>] syscall_call+0x7/0xb
That's:
WARN_ON_ONCE(irqs_disabled());
And another, tainted but probably valid:
BUG: warning at kernel/softirq.c:138/local_bh_enable() (Tainted: P )
[<c042b2ef>] local_bh_enable+0x45/0x92
[<c06036b7>] cond_resched_softirq+0x2c/0x42
[<c059d5d0>] release_sock+0x54/0xa3
[<c05c9428>] tcp_sendmsg+0x91b/0xa0c
[<c04e8b30>] copy_to_user+0x3c/0x50
[<c05a1b71>] memcpy_toiovec+0x27/0x4a
[<c059d58f>] release_sock+0x13/0xa3
[<c0604ad5>] _spin_unlock_bh+0x5/0xd
[<c05e1bb9>] inet_sendmsg+0x3b/0x45
[<c059af34>] sock_aio_write+0xf9/0x105
[<c0475f31>] do_sync_readv_writev+0xc1/0xfe
[<c0437265>] autoremove_wake_function+0x0/0x35
[<c04e88e0>] copy_from_user+0x3a/0x66
[<c0475dec>] rw_copy_check_uvector+0x5c/0xb0
[<c047667a>] do_readv_writev+0xbc/0x187
[<c059ae3b>] sock_aio_write+0x0/0x105
[<c0476782>] vfs_writev+0x3d/0x48
[<c0476bee>] sys_writev+0x41/0x95
[<c0404f70>] syscall_call+0x7/0xb
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=240982
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-23 17:00 ` Chuck Ebbert
@ 2007-05-23 18:38 ` Chuck Ebbert
2007-05-23 23:24 ` Anant Nitya
2007-05-24 7:45 ` Ingo Molnar
1 sibling, 1 reply; 27+ messages in thread
From: Chuck Ebbert @ 2007-05-23 18:38 UTC (permalink / raw)
To: Chuck Ebbert
Cc: Ingo Molnar, Michal Piotrowski, Thomas Gleixner, Anant Nitya,
linux-kernel, David Miller, Netdev
Chuck Ebbert wrote:
>
> https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=240982
Another; these started to appear after the below patch was merged:
> Index: linux/kernel/sched.c
> > ===================================================================
> > --- linux.orig/kernel/sched.c
> > +++ linux/kernel/sched.c
> > @@ -4212,9 +4212,7 @@ int __sched cond_resched_softirq(void)
> > BUG_ON(!in_softirq());
> >
> > if (need_resched() && system_state == SYSTEM_RUNNING) {
> > - raw_local_irq_disable();
> > - _local_bh_enable();
> > - raw_local_irq_enable();
> > + local_bh_enable();
> > __cond_resched();
> > local_bh_disable();
> > return 1;
May 23 19:26:26 localhost kernel: BUG: warning at kernel/softirq.c:138/local_bh_enable() (Not tainted)
May 23 19:26:26 localhost kernel: [<c042b2ef>] local_bh_enable+0x45/0x92
May 23 19:26:26 localhost kernel: [<c06036b7>] cond_resched_softirq+0x2c/0x42
May 23 19:26:26 localhost kernel: [<c059d5d0>] release_sock+0x54/0xa3
May 23 19:26:26 localhost kernel: [<c04373af>] prepare_to_wait+0x24/0x3f
May 23 19:26:26 localhost kernel: [<c05e267f>] inet_stream_connect+0x116/0x1ff
May 23 19:26:26 localhost kernel: [<c0437265>] autoremove_wake_function+0x0/0x35
May 23 19:26:26 localhost kernel: [<c059c339>] sys_connect+0x82/0xad
May 23 19:26:26 localhost kernel: [<c059d58f>] release_sock+0x13/0xa3
May 23 19:26:26 localhost kernel: [<c0604ad5>] _spin_unlock_bh+0x5/0xd
May 23 19:26:26 localhost kernel: [<c059e714>] sock_setsockopt+0x4a8/0x4b2
May 23 19:26:26 localhost kernel: [<c059b6b6>] sock_attach_fd+0x70/0xd2
May 23 19:26:26 localhost kernel: [<c04774a0>] get_empty_filp+0xfc/0x170
May 23 19:26:26 localhost kernel: [<c059b54f>] sys_setsockopt+0x9b/0xa7
May 23 19:26:26 localhost kernel: [<c059cb83>] sys_socketcall+0xac/0x261
May 23 19:26:26 localhost kernel: [<c0404f70>] syscall_call+0x7/0xb
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
[not found] ` <20070521200428.GA9855@osiris.ibm.com>
@ 2007-05-23 20:54 ` Mikulas Patocka
0 siblings, 0 replies; 27+ messages in thread
From: Mikulas Patocka @ 2007-05-23 20:54 UTC (permalink / raw)
To: Heiko Carstens; +Cc: Thomas Gleixner, David Miller, linux-kernel
On Mon, 21 May 2007, Heiko Carstens wrote:
> On Sun, May 20, 2007 at 09:29:49PM +0200, Thomas Gleixner wrote:
>> On Sun, 2007-05-20 at 21:18 +0200, Heiko Carstens wrote:
>>>>> Hmm, that's a different problem than the 0x22 which shows up on
>>>>> hyperthreading enabled P4 systems. Are you using plip ?
>>>>
>>>> No, after all it turned out that is caused by an IBM internal module.
>>>> Just ignore me, sorry for the noise :)
>>>
>>> Just in case you're interested: I just looked into it and it turned
>>> out that this module was calling netif_rx() from process context,
>>> just like plip. Changing it to netif_rx_ni() fixes it.
>>
>> Thanks, that's a good pointer. You should have cc'ed Dave Miller and the
>> guy who found this plip thingy. Care to resend ?
>
> No problem. Here we go, even though I doubt that netif_rx_ni() is what
> people want for plip. Dunno...
netif_rx_ni calls softirq synchronously, am I right? That would probably
hurt plip. I can try it if someone will be interested in it, but I doubt
it is good solution for any network interfaces except tun.
BTW. does in_interrupt() have high cost on some high-performance
architectures? Would it be possible to just add if (!in_interrupt())
wakeup_softirqd(); to netif_rx()?
Mikulas
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-23 18:38 ` Chuck Ebbert
@ 2007-05-23 23:24 ` Anant Nitya
0 siblings, 0 replies; 27+ messages in thread
From: Anant Nitya @ 2007-05-23 23:24 UTC (permalink / raw)
To: linux-kernel
Cc: Chuck Ebbert, Ingo Molnar, Michal Piotrowski, Thomas Gleixner,
David Miller, Netdev
On Thursday 24 May 2007 00:08:40 Chuck Ebbert wrote:
> Chuck Ebbert wrote:
> > https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=240982
>
> Another; these started to appear after the below patch was merged:
> > Index: linux/kernel/sched.c
> >
> > > ===================================================================
> > > --- linux.orig/kernel/sched.c
> > > +++ linux/kernel/sched.c
> > > @@ -4212,9 +4212,7 @@ int __sched cond_resched_softirq(void)
> > > BUG_ON(!in_softirq());
> > >
> > > if (need_resched() && system_state == SYSTEM_RUNNING) {
> > > - raw_local_irq_disable();
> > > - _local_bh_enable();
> > > - raw_local_irq_enable();
> > > + local_bh_enable();
> > > __cond_resched();
> > > local_bh_disable();
> > > return 1;
>
> May 23 19:26:26 localhost kernel: BUG: warning at
> kernel/softirq.c:138/local_bh_enable() (Not tainted) May 23 19:26:26
> localhost kernel: [<c042b2ef>] local_bh_enable+0x45/0x92 May 23 19:26:26
> localhost kernel: [<c06036b7>] cond_resched_softirq+0x2c/0x42 May 23
> 19:26:26 localhost kernel: [<c059d5d0>] release_sock+0x54/0xa3 May 23
> 19:26:26 localhost kernel: [<c04373af>] prepare_to_wait+0x24/0x3f May 23
> 19:26:26 localhost kernel: [<c05e267f>] inet_stream_connect+0x116/0x1ff
> May 23 19:26:26 localhost kernel: [<c0437265>]
> autoremove_wake_function+0x0/0x35 May 23 19:26:26 localhost kernel:
> [<c059c339>] sys_connect+0x82/0xad May 23 19:26:26 localhost kernel:
> [<c059d58f>] release_sock+0x13/0xa3 May 23 19:26:26 localhost kernel:
> [<c0604ad5>] _spin_unlock_bh+0x5/0xd May 23 19:26:26 localhost kernel:
> [<c059e714>] sock_setsockopt+0x4a8/0x4b2 May 23 19:26:26 localhost kernel:
> [<c059b6b6>] sock_attach_fd+0x70/0xd2 May 23 19:26:26 localhost kernel:
> [<c04774a0>] get_empty_filp+0xfc/0x170 May 23 19:26:26 localhost kernel:
> [<c059b54f>] sys_setsockopt+0x9b/0xa7 May 23 19:26:26 localhost kernel:
> [<c059cb83>] sys_socketcall+0xac/0x261 May 23 19:26:26 localhost kernel:
> [<c0404f70>] syscall_call+0x7/0xb
strange, while applying the concerned patch first time I was hand editing __
kernel/sched.c __ and stupidly typed _local_bh_enable() instead of
local_bh_enable() and when did a reboot, as soon as I got inside X I was
welcomed with following message in system log.
[ 152.692609] BUG: at kernel/softirq.c:122 _local_bh_enable()
[ 152.692637] [<b040624d>] show_trace_log_lvl+0x1a/0x2f
[ 152.692658] [<b0406801>] show_trace+0x12/0x14
[ 152.692668] [<b0406885>] dump_stack+0x16/0x18
[ 152.692678] [<b0428d66>] _local_bh_enable+0x8b/0xc3
[ 152.692688] [<b059e497>] cond_resched_softirq+0x2b/0x40
[ 152.692700] [<b05797b6>] established_get_first+0x19/0xad
[ 152.692712] [<b057a831>] tcp_seq_next+0x76/0x8c
[ 152.692722] [<b04875ef>] seq_read+0x17b/0x264
[ 152.692733] [<b047102a>] vfs_read+0xad/0x161
[ 152.692745] [<b04714b6>] sys_read+0x3d/0x61
[ 152.692755] [<b04050d4>] syscall_call+0x7/0xb
[ 152.692765] =======================
[ 152.692770] BUG: at kernel/lockdep.c:1937 trace_softirqs_on()
[ 152.692777] [<b040624d>] show_trace_log_lvl+0x1a/0x2f
[ 152.692789] [<b0406801>] show_trace+0x12/0x14
[ 152.692800] [<b0406885>] dump_stack+0x16/0x18
[ 152.692810] [<b043f5a5>] trace_softirqs_on+0x5f/0xa5
[ 152.692822] [<b0428d8e>] _local_bh_enable+0xb3/0xc3
[ 152.692831] [<b059e497>] cond_resched_softirq+0x2b/0x40
[ 152.692842] [<b05797b6>] established_get_first+0x19/0xad
[ 152.692852] [<b057a831>] tcp_seq_next+0x76/0x8c
[ 152.692862] [<b04875ef>] seq_read+0x17b/0x264
[ 152.692870] [<b047102a>] vfs_read+0xad/0x161
[ 152.692879] [<b04714b6>] sys_read+0x3d/0x61
[ 152.692889] [<b04050d4>] syscall_call+0x7/0xb
[ 152.692899] =======================
[ 159.257890] NOHZ: local_softirq_pending 22
[ 159.266009] NOHZ: local_softirq_pending 22
[ 159.273965] NOHZ: local_softirq_pending 22
[ 159.281884] NOHZ: local_softirq_pending 22
[ 160.712828] NOHZ: local_softirq_pending 22
[ 162.609377] NOHZ: local_softirq_pending 22
[ 162.609804] NOHZ: local_softirq_pending 22
[ 162.610054] NOHZ: local_softirq_pending 22
[ 162.610279] NOHZ: local_softirq_pending 22
[ 162.610502] NOHZ: local_softirq_pending 22
After realzing my mistake, I changed it to local_bh_enable() as was in patch
and since then not a single BUG or local_softirq_pending message occurs in
system log, maybe my system waiting for that condition to happen :).
--
Out of many thousands, one may endeavor for perfection, and of
those who have achieved perfection, hardly one knows Me in truth.
-- Gita Sutra Of Mysticism
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [BUG] local_softirq_pending storm
2007-05-23 17:00 ` Chuck Ebbert
2007-05-23 18:38 ` Chuck Ebbert
@ 2007-05-24 7:45 ` Ingo Molnar
1 sibling, 0 replies; 27+ messages in thread
From: Ingo Molnar @ 2007-05-24 7:45 UTC (permalink / raw)
To: Chuck Ebbert
Cc: Michal Piotrowski, Thomas Gleixner, Anant Nitya, linux-kernel,
David Miller, Andrew Morton
* Chuck Ebbert <cebbert@redhat.com> wrote:
> > if (need_resched() && system_state == SYSTEM_RUNNING) {
> > - raw_local_irq_disable();
> > - _local_bh_enable();
> > - raw_local_irq_enable();
> > + local_bh_enable();
> > __cond_resched();
> > local_bh_disable();
> > return 1;
>
> We may have a problem with that:
>
> BUG: warning at kernel/softirq.c:138/local_bh_enable() (Not tainted)
> [<c042b2ef>] local_bh_enable+0x45/0x92
> [<c06036b7>] cond_resched_softirq+0x2c/0x42
> [<c059d5d0>] release_sock+0x54/0xa3
> [<c05c9428>] tcp_sendmsg+0x91b/0xa0c
> [<c05e1bb9>] inet_sendmsg+0x3b/0x45
> [<c059af34>] sock_aio_write+0xf9/0x105
> [<c0476035>] do_sync_write+0xc7/0x10a
> [<c0437265>] autoremove_wake_function+0x0/0x35
> [<c047688e>] vfs_write+0xbc/0x154
> [<c0476e8c>] sys_write+0x41/0x67
> [<c0404f70>] syscall_call+0x7/0xb
hm, this place really shouldnt call cond_resched_softirq() with hardirqs
disabled.
perhaps a buggy ->sk_backlog_rcv() handler disabled interrupts without
restoring them?
could you enable CONFIG_PROVE_LOCKING and apply the patch below - which
location is printed as having last disabled hardirqs?
Ingo
--------------------->
Subject: [patch] softirqs: print out irq-trace events
From: Ingo Molnar <mingo@elte.hu>
some code is fiddling with softirqs but hardirqs are disabled, so try to
figure out who disabled hardirqs.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
kernel/softirq.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
Index: linux/kernel/softirq.c
===================================================================
--- linux.orig/kernel/softirq.c
+++ linux/kernel/softirq.c
@@ -135,7 +135,15 @@ void local_bh_enable(void)
WARN_ON_ONCE(in_irq());
#endif
- WARN_ON_ONCE(irqs_disabled());
+ if (irqs_disabled()) {
+ static int once = 1;
+
+ if (once) {
+ once = 0;
+ print_irqtrace_events(current);
+ WARN_ON(1);
+ }
+ }
#ifdef CONFIG_TRACE_IRQFLAGS
local_irq_save(flags);
^ permalink raw reply [flat|nested] 27+ messages in thread
end of thread, other threads:[~2007-05-24 7:46 UTC | newest]
Thread overview: 27+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2007-05-09 14:12 [BUG] local_softirq_pending storm Anant Nitya
2007-05-09 16:31 ` Thomas Gleixner
2007-05-10 11:53 ` Anant Nitya
2007-05-10 21:58 ` Thomas Gleixner
2007-05-17 6:41 ` Anant Nitya
2007-05-18 13:01 ` Thomas Gleixner
2007-05-19 4:30 ` Anant Nitya
2007-05-19 9:55 ` Anant Nitya
2007-05-19 19:11 ` Thomas Gleixner
2007-05-19 21:23 ` Anant Nitya
2007-05-20 21:43 ` Thomas Gleixner
2007-05-21 6:22 ` Anant Nitya
2007-05-21 9:01 ` Thomas Gleixner
2007-05-21 10:02 ` Anant Nitya
2007-05-21 18:45 ` Anant Nitya
2007-05-22 19:03 ` Michal Piotrowski
2007-05-22 19:59 ` Michal Piotrowski
2007-05-22 20:10 ` Ingo Molnar
2007-05-22 20:23 ` Michal Piotrowski
2007-05-23 17:00 ` Chuck Ebbert
2007-05-23 18:38 ` Chuck Ebbert
2007-05-23 23:24 ` Anant Nitya
2007-05-24 7:45 ` Ingo Molnar
2007-05-20 10:18 ` Heiko Carstens
2007-05-20 13:52 ` Thomas Gleixner
2007-05-20 18:36 ` Heiko Carstens
[not found] ` <20070520191800.GA14225@osiris.ibm.com>
[not found] ` <1179689389.6570.1.camel@chaos>
[not found] ` <20070521200428.GA9855@osiris.ibm.com>
2007-05-23 20:54 ` Mikulas Patocka
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