From: Valdis.Kletnieks@vt.edu
To: Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linux-kernel@vger.kernel.org
Subject: mmotm 2010-04-05 - another RCU whinge (not network this time)
Date: Thu, 08 Apr 2010 19:57:28 -0400 [thread overview]
Message-ID: <6417.1270771048@localhost> (raw)
In-Reply-To: Your message of "Mon, 05 Apr 2010 16:09:45 PDT." <201004052336.o35NaeSE015814@imap1.linux-foundation.org>
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On Mon, 05 Apr 2010 16:09:45 PDT, akpm@linux-foundation.org said:
> The mm-of-the-moment snapshot 2010-04-05-16-09 has been uploaded to
>
> http://userweb.kernel.org/~akpm/mmotm/
Hit another one. I seem to be on a roll...
Seen in dmesg, happened near end of the initrd..
[ 26.756864]
[ 26.756866] ===================================================
[ 26.756869] [ INFO: suspicious rcu_dereference_check() usage. ]
[ 26.756871] ---------------------------------------------------
[ 26.756874] fs/proc/array.c:241 invoked rcu_dereference_check() without protection!
[ 26.756876]
[ 26.756877] other info that might help us debug this:
[ 26.756877]
[ 26.756879]
[ 26.756880] rcu_scheduler_active = 1, debug_locks = 0
[ 26.756883] 2 locks held by pidof/2197:
[ 26.756884] #0: (&p->lock){+.+.+.}, at: [<ffffffff810f4c2a>] seq_read+0x3a/0x42d
[ 26.756894] #1: (&(&sighand->siglock)->rlock){......}, at: [<ffffffff81047eff>] lock_task_sighand+0x79/0xcf
[ 26.756903]
[ 26.756903] stack backtrace:
[ 26.756906] Pid: 2197, comm: pidof Not tainted 2.6.34-rc3-mmotm0405 #3
[ 26.756909] Call Trace:
[ 26.756914] [<ffffffff810638c5>] lockdep_rcu_dereference+0xaa/0xb2
[ 26.756919] [<ffffffff8112ed88>] collect_sigign_sigcatch+0x37/0xa0
[ 26.756923] [<ffffffff8112f066>] do_task_stat+0x275/0x837
[ 26.756927] [<ffffffff81063f83>] ? mark_held_locks+0x52/0x70
[ 26.756931] [<ffffffff810af6be>] ? get_page_from_freelist+0x390/0x5ab
[ 26.756935] [<ffffffff81062e7b>] ? register_lock_class+0x1e/0x325
[ 26.756938] [<ffffffff8106421a>] ? trace_hardirqs_on+0xd/0xf
[ 26.756942] [<ffffffff810af742>] ? get_page_from_freelist+0x414/0x5ab
[ 26.756946] [<ffffffff81063d32>] ? mark_lock+0x2d/0x22c
[ 26.756949] [<ffffffff81063d32>] ? mark_lock+0x2d/0x22c
[ 26.756953] [<ffffffff81064fe7>] ? __lock_acquire+0x391/0xcfc
[ 26.756956] [<ffffffff810b006f>] ? __alloc_pages_nodemask+0x796/0x823
[ 26.756961] [<ffffffff810d4e60>] ? ____cache_alloc+0x10a/0x5cb
[ 26.756964] [<ffffffff810d4e60>] ? ____cache_alloc+0x10a/0x5cb
[ 26.756969] [<ffffffff8159f84c>] ? sub_preempt_count+0x35/0x49
[ 26.756973] [<ffffffff8112f637>] proc_tgid_stat+0xf/0x11
[ 26.756977] [<ffffffff8112c005>] proc_single_show+0x57/0x74
[ 26.756980] [<ffffffff810f4ca1>] ? seq_read+0xb1/0x42d
[ 26.756983] [<ffffffff810f4dc3>] seq_read+0x1d3/0x42d
[ 26.756988] [<ffffffff810da357>] vfs_read+0xe0/0x140
[ 26.756991] [<ffffffff810da46d>] sys_read+0x45/0x69
[ 26.756996] [<ffffffff810026eb>] system_call_fastpath+0x16/0x1b
[ 26.788544] dracut: Switching root
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next prev parent reply other threads:[~2010-04-08 23:58 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-05 23:09 mmotm 2010-04-05-16-09 uploaded akpm
2010-04-06 5:04 ` [PATCH mmotm] hid-picolcd: depends on LCD_CLASS_DEVICE Randy Dunlap
2010-04-06 8:40 ` Jiri Kosina
2010-04-06 8:56 ` Bruno Prémont
2010-04-06 15:26 ` Randy Dunlap
2010-04-06 16:35 ` Bruno Prémont
2010-04-06 16:56 ` Randy Dunlap
2010-04-06 21:04 ` Bruno Prémont
2010-04-07 16:20 ` Randy Dunlap
2010-04-07 18:31 ` Bruno Prémont
2010-04-08 12:42 ` Jiri Kosina
2010-04-11 10:17 ` Bruno Prémont
2010-04-11 18:28 ` Jiri Kosina
2010-04-07 18:44 ` Bruno Prémont
2010-04-07 20:12 ` Randy Dunlap
2010-04-07 20:29 ` Bruno Prémont
2010-04-07 18:01 ` mmotm 2010-04-05-16-09 uploaded Valdis.Kletnieks
2010-04-08 11:41 ` Patrick McHardy
2010-04-08 15:23 ` Valdis.Kletnieks
2010-04-08 15:36 ` Patrick McHardy
2010-04-09 0:50 ` Valdis.Kletnieks
2010-04-09 14:49 ` Patrick McHardy
2010-04-08 23:57 ` Valdis.Kletnieks [this message]
2010-04-09 23:16 ` mmotm 2010-04-05 - another RCU whinge (not network this time) Paul E. McKenney
2010-04-10 3:22 ` Valdis.Kletnieks
2010-04-10 5:15 ` Paul E. McKenney
2010-04-12 18:32 ` Oleg Nesterov
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