Re: OOM detection regressions since 4.7

[Olaf Hering <olaf@aepfle.de>]

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On Thu, Aug 25, Olaf Hering wrote:

> On Thu, Aug 25, Michal Hocko wrote:
> 
> > Any luck with the testing of this patch?

I ran rc3 for a few hours on Friday amd FireFox was not killed.
Now rc3 is running for a day with the usual workload and FireFox is
still running.

Today I noticed the nfsserver was disabled, probably since months already.
Starting it gives a OOM, not sure if this is new with 4.7+.
Full dmesg attached.


[    0.000000] Linux version 4.8.0-rc3-3.bug994066-default (geeko@buildhost) (gcc version 6.1.1 20160815 [gcc-6-branch revision 239479] (SUSE Linux) ) #1 SMP PREEMPT Mon Aug 22 14:52:18 UTC 2016 (c0d2ef5)

[64378.582489] tun: Universal TUN/TAP device driver, 1.6
[64378.582493] tun: (C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>
[93347.645123] RPC: Registered named UNIX socket transport module.
[93347.645128] RPC: Registered udp transport module.
[93347.645130] RPC: Registered tcp transport module.
[93347.645132] RPC: Registered tcp NFSv4.1 backchannel transport module.
[93348.227828] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
[93348.306369] modprobe: page allocation failure: order:4, mode:0x26040c0(GFP_KERNEL|__GFP_COMP|__GFP_NOTRACK)
[93348.306379] CPU: 2 PID: 30467 Comm: modprobe Not tainted 4.8.0-rc3-3.bug994066-default #1
[93348.306382] Hardware name: Hewlett-Packard HP ProBook 6555b/1455, BIOS 68DTM Ver. F.21 06/14/2012
[93348.306386]  0000000000000000 ffffffff813a2952 0000000000000004 ffff88003fb6ba30
[93348.306394]  ffffffff81198a4b 026040c00000000f 026040c000000001 ffff88003fb6c000
[93348.306400]  0000000000000004 ffff88003fb6baac 00000000026040c0 0000000000000040
[93348.306406] Call Trace:
[93348.306437]  [<ffffffff8102eefe>] dump_trace+0x5e/0x310
[93348.306449]  [<ffffffff8102f2cb>] show_stack_log_lvl+0x11b/0x1a0
[93348.306459]  [<ffffffff81030001>] show_stack+0x21/0x40
[93348.306468]  [<ffffffff813a2952>] dump_stack+0x5c/0x7a
[93348.306478]  [<ffffffff81198a4b>] warn_alloc_failed+0xdb/0x150
[93348.306490]  [<ffffffff81198cef>] __alloc_pages_slowpath+0x1af/0xa10
[93348.306501]  [<ffffffff811997a0>] __alloc_pages_nodemask+0x250/0x290
[93348.306511]  [<ffffffff811f1c3d>] cache_grow_begin+0x8d/0x540
[93348.306520]  [<ffffffff811f23d1>] fallback_alloc+0x161/0x200
[93348.306530]  [<ffffffff811f43f2>] __kmalloc+0x1d2/0x570
[93348.306589]  [<ffffffffa08f025a>] nfsd_reply_cache_init+0xaa/0x110 [nfsd]
[93348.306649]  [<ffffffffa093f1b6>] init_nfsd+0x56/0xea0 [nfsd]
[93348.306664]  [<ffffffff8100218b>] do_one_initcall+0x4b/0x180
[93348.306674]  [<ffffffff8118e119>] do_init_module+0x5b/0x1fe
[93348.306684]  [<ffffffff81105395>] load_module+0x1a75/0x1d00
[93348.306695]  [<ffffffff81105804>] SYSC_finit_module+0xa4/0xe0
[93348.306705]  [<ffffffff816d2cb6>] entry_SYSCALL_64_fastpath+0x1e/0xa8
[93348.313626] DWARF2 unwinder stuck at entry_SYSCALL_64_fastpath+0x1e/0xa8

[93348.313629] Leftover inexact backtrace:

[93348.313691] Mem-Info:
[93348.313704] active_anon:467209 inactive_anon:125491 isolated_anon:0
                active_file:264880 inactive_file:166389 isolated_file:0
                unevictable:8 dirty:250 writeback:0 unstable:0
                slab_reclaimable:796425 slab_unreclaimable:34803
                mapped:54783 shmem:24119 pagetables:9083 bounce:0
                free:51321 free_pcp:68 free_cma:0
[93348.313717] Node 0 active_anon:1868836kB inactive_anon:501964kB active_file:1059520kB inactive_file:665556kB unevictable:32kB isolated(anon):0kB isolated(file):0kB mapped:219132kB dirty:1000kB writeback:0kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 749568kB anon_thp: 96476kB writeback_tmp:0kB unstable:0kB pages_scanned:24 all_unreclaimable? no
[93348.313719] Node 0 DMA free:15908kB min:136kB low:168kB high:200kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[93348.313729] lowmem_reserve[]: 0 2626 7621 7621 7621
[93348.313745] Node 0 DMA32 free:133192kB min:23244kB low:29052kB high:34860kB active_anon:642152kB inactive_anon:119848kB active_file:257900kB inactive_file:116560kB unevictable:0kB writepending:292kB present:2847412kB managed:2766832kB mlocked:0kB slab_reclaimable:1418576kB slab_unreclaimable:39004kB kernel_stack:256kB pagetables:1448kB bounce:0kB free_pcp:128kB local_pcp:0kB free_cma:0kB
[93348.313755] lowmem_reserve[]: 0 0 4994 4994 4994
[93348.313762] Node 0 Normal free:56184kB min:44200kB low:55248kB high:66296kB active_anon:1226576kB inactive_anon:382200kB active_file:801508kB inactive_file:548992kB unevictable:32kB writepending:536kB present:5242880kB managed:5114880kB mlocked:32kB slab_reclaimable:1767124kB slab_unreclaimable:100208kB kernel_stack:9104kB pagetables:34884kB bounce:0kB free_pcp:144kB local_pcp:0kB free_cma:0kB
[93348.313771] lowmem_reserve[]: 0 0 0 0 0
[93348.313778] Node 0 DMA: 1*4kB (U) 0*8kB 0*16kB 1*32kB (U) 2*64kB (U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) = 15908kB
[93348.313803] Node 0 DMA32: 13633*4kB (UME) 8035*8kB (UME) 890*16kB (UME) 10*32kB (U) 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 133372kB
[93348.313822] Node 0 Normal: 14003*4kB (UME) 25*8kB (UME) 2*16kB (UM) 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 56244kB
[93348.313843] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
[93348.313846] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
[93348.313848] 457622 total pagecache pages
[93348.313850] 2194 pages in swap cache
[93348.313853] Swap cache stats: add 60025, delete 57831, find 17283/19516
[93348.313854] Free swap  = 8170356kB
[93348.313856] Total swap = 8384508kB
[93348.313858] 2026571 pages RAM
[93348.313859] 0 pages HighMem/MovableOnly
[93348.313860] 52166 pages reserved
[93348.313861] 0 pages hwpoisoned
[93348.313865] nfsd: failed to allocate reply cache

Olaf

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