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Date: Wed, 11 Jan 2006 12:46:17 -0800
From: Andrew Morton <akpm@osdl.org>
To: Andi Kleen <ak@suse.de>
Cc: linux-kernel@vger.kernel.org, sct@redhat.com, Ingo Molnar <mingo@elte.hu>
Subject: Re: 2.6.15-git7 oopses in ext3 during LTP runs
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Andi Kleen <ak@suse.de> wrote:
>
> 
> Running LTP with the default runfile on a 4 virtual CPU x86-64 
> system gives
> 
> To reproduce: run ltp 20040908 (newer one will probably work
> too) with runltp -p -q -l `uname -r` on a ext3 file system
> 
> config is x86-64 defconfig.
> 

mutex_trylock() is returning the wrong value.  fs/super.c:write_super()
clearly took the lock.

Ingo, weren't you hitting this occasionally?

> 
> ----------- [cut here ] --------- [please bite here ] ---------
> Kernel BUG at /home/lsrc/quilt/linux/fs/ext3/super.c:2154
> invalid opcode: 0000 [1] SMP 
> CPU 0 
> Modules linked in:
> Pid: 14055, comm: pdflush Not tainted 2.6.15-git7 #90
> RIP: 0010:[<ffffffff801d998e>] <ffffffff801d998e>{ext3_write_super+20}
> RSP: 0018:ffff810117fb1e08  EFLAGS: 00010202
> RAX: 0000000000000001 RBX: ffff81011f9ae800 RCX: ffffffff80492060
> RDX: 0000000000000000 RSI: ffff810117fb0000 RDI: ffff81011f9ae888
> RBP: ffff81011f9ae888 R08: ffff810117fb0000 R09: ffff810004f219e0
> R10: 0000000000000000 R11: 0000000000000002 R12: ffff81011f9ae870
> R13: ffffffff80159aee R14: ffff8100cdce1d68 R15: ffffffff80146b14
> FS:  0000000000000000(0000) GS:ffffffff8060d000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
> CR2: 00002aaaaab61000 CR3: 000000011baf3000 CR4: 00000000000006e0
> Process pdflush (pid: 14055, threadinfo ffff810117fb0000, task ffff81011fe5c400)
> Stack: ffff81011f9ae800 ffffffff8017aa43 0000000000000064 0000000000000000 
>        ffff8100cdce1d78 ffffffff801592f9 ffff81011fe5c400 ffffffff80494000 
>        0000000000000000 0000000000000000 
> Call Trace: <ffffffff8017aa43>{sync_supers+133} <ffffffff801592f9>{wb_kupdate+49}
>        <ffffffff80159aee>{pdflush+0} <ffffffff80159c40>{pdflush+338}
>        <ffffffff801592c8>{wb_kupdate+0} <ffffffff80146c7f>{kthread+203}
>        <ffffffff801107ca>{child_rip+8} <ffffffff80146b14>{keventd_create_kthread+0}
>        <ffffffff80146bb4>{kthread+0} <ffffffff801107c2>{child_rip+0}
> 
> Code: 0f 0b 68 e9 0d 43 80 c2 6a 08 c6 43 21 00 5b c3 49 c7 c0 ca 
> RIP <ffffffff801d998e>{ext3_write_super+20} RSP <ffff810117fb1e08>
>  Badness in do_exit at /home/lsrc/quilt/linux/kernel/exit.c:796
> 
> Call Trace: <ffffffff80136800>{do_exit+84} <ffffffff804024dd>{_spin_unlock_irqrestore+8}
>        <ffffffff80146b14>{keventd_create_kthread+0} <ffffffff801114ef>{kernel_math_error+0}
>        <ffffffff80159aee>{pdflush+0} <ffffffff80111c61>{do_invalid_op+163}
>        <ffffffff801d998e>{ext3_write_super+20} <ffffffff8040116a>{thread_return+0}
>        <ffffffff80110611>{error_exit+0} <ffffffff80146b14>{keventd_create_kthread+0}
>        <ffffffff80159aee>{pdflush+0} <ffffffff801d998e>{ext3_write_super+20}
>        <ffffffff801d998a>{ext3_write_super+16} <ffffffff8017aa43>{sync_supers+133}
>        <ffffffff801592f9>{wb_kupdate+49} <ffffffff80159aee>{pdflush+0}
>        <ffffffff80159c40>{pdflush+338} <ffffffff801592c8>{wb_kupdate+0}
>        <ffffffff80146c7f>{kthread+203} <ffffffff801107ca>{child_rip+8}
>        <ffffffff80146b14>{keventd_create_kthread+0} <ffffffff80146bb4>{kthread+0}
>        <ffffffff801107c2>{child_rip+0}