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Message-ID: <64bb37e0711171140w5f1451e0qea081a4fbc7a45f7@mail.gmail.com>
Date: Sat, 17 Nov 2007 20:40:22 +0100
From: "Torsten Kaiser" <just.for.lkml@...glemail.com>
To: "Andrew Morton" <akpm@...ux-foundation.org>
Cc: "Ingo Molnar" <mingo@...e.hu>,
"Kamalesh Babulal" <kamalesh@...ux.vnet.ibm.com>,
LKML <linux-kernel@...r.kernel.org>, linuxppc-dev@...abs.org,
nfs@...ts.sourceforge.net, "Andy Whitcroft" <apw@...dowen.org>,
"Balbir Singh" <balbir@...ux.vnet.ibm.com>,
"Jan Blunck" <jblunck@...e.de>,
"Trond Myklebust" <trond.myklebust@....uio.no>,
"Peter Zijlstra" <a.p.zijlstra@...llo.nl>
Subject: Re: [BUG] 2.6.24-rc2-mm1 - kernel bug on nfs v4
On Nov 17, 2007 7:19 PM, Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Sat, 17 Nov 2007 19:09:46 +0100 Ingo Molnar <mingo@...e.hu> wrote:
>
> >
> > * Torsten Kaiser <just.for.lkml@...glemail.com> wrote:
> >
> > > Sadly lockdep does not work for me, as it gets turned off early:
> > > [ 39.851594] ---------------------------------
> > > [ 39.855963] inconsistent {softirq-on-W} -> {in-softirq-W} usage.
> > > [ 39.861981] swapper/0 [HC0[0]:SC1[1]:HE0:SE0] takes:
> > > [ 39.866963] (&n->list_lock){-+..}, at: [<ffffffff802935c1>]
> >
> > hey, that means it found a bug - which is not sad at all :-)
It was sad, that it found a bug that I was not searching for. ;)
> mutter.
>
> Torsten, you could try CONFIG_SLAB=y, CONFIG_SLUB=n to see if you can make
> some progress on the NFS problem.
I should had thought of that myself... OK anyway here is the result:
The hang is reproducable, emerge froze the system again after download
the source.
Lockdep triggers immedetly before the freeze, but the result is still
not helpful:
[ 221.565011] INFO: trying to register non-static key.
[ 221.566999] the code is fine but needs lockdep annotation.
[ 221.569206] turning off the locking correctness validator.
[ 221.571404]
[ 221.571405] Call Trace:
[ 221.572996] [<ffffffff8025a1b4>] __lock_acquire+0x4c4/0x1140
[ 221.575298] [<ffffffff8025ae85>] lock_acquire+0x55/0x70
[ 221.577429] [<ffffffff8022d6fd>] __wake_up+0x2d/0x70
[ 221.579457] [<ffffffff805c5f04>] _spin_lock_irqsave+0x34/0x50
[ 221.581800] [<ffffffff805c5e45>] _spin_unlock_irqrestore+0x55/0x70
[ 221.584317] [<ffffffff8022d6fd>] __wake_up+0x2d/0x70
[ 221.586344] [<ffffffff805a88b0>] rpc_async_schedule+0x0/0x10
[ 221.588648] [<ffffffff802fface>] nfs_free_unlinkdata+0x1e/0x50
[ 221.591023] [<ffffffff805a7e96>] rpc_release_calldata+0x26/0x50
[ 221.593428] [<ffffffff8024778f>] run_workqueue+0x16f/0x210
[ 221.595662] [<ffffffff80259731>] trace_hardirqs_on+0xc1/0x160
[ 221.598004] [<ffffffff802483d0>] worker_thread+0x0/0xb0
[ 221.600130] [<ffffffff802483d0>] worker_thread+0x0/0xb0
[ 221.602265] [<ffffffff8024843d>] worker_thread+0x6d/0xb0
[ 221.604431] [<ffffffff8024bfc0>] autoremove_wake_function+0x0/0x30
[ 221.606939] [<ffffffff802483d0>] worker_thread+0x0/0xb0
[ 221.609067] [<ffffffff802483d0>] worker_thread+0x0/0xb0
[ 221.611199] [<ffffffff8024bbeb>] kthread+0x4b/0x80
[ 221.613156] [<ffffffff8020cb98>] child_rip+0xa/0x12
[ 221.615151] [<ffffffff8020c2af>] restore_args+0x0/0x30
[ 221.617247] [<ffffffff8024bba0>] kthread+0x0/0x80
[ 221.619162] [<ffffffff8020cb8e>] child_rip+0x0/0x12
[ 221.621147]
[ 221.621749] INFO: lockdep is turned off.
[ 226.369259] SysRq : Emergency Sync
[ 226.331342] Emergency Sync complete
[ 227.064545] SysRq : Emergency Remount R/O
[ 228.193491] SysRq : Emergency Sync
[ 228.155593] Emergency Sync complete
[ 228.767931] SysRq : Resetting
I also had another BUG output during system startup, but that should
be unrelated:
[ 103.254681] BUG: sleeping function called from invalid context at
kernel/rwsem.c:20
[ 103.257757] in_atomic():0, irqs_disabled():1
[ 103.259469] 1 lock held by artsd/5883:
[ 103.259470] #0: (pm_qos_lock){....}, at: [<ffffffff80250efb>]
pm_qos_add_requirement+0x6b/0xf0
[ 103.263316] irq event stamp: 49712
[ 103.263318] hardirqs last enabled at (49711): [<ffffffff802941ed>]
__kmalloc+0x10d/0x180
[ 103.263321] hardirqs last disabled at (49712): [<ffffffff805c5eea>]
_spin_lock_irqsave+0x1a/0x50
[ 103.263326] softirqs last enabled at (48820): [<ffffffff805954d9>]
unix_release_sock+0x79/0x240
[ 103.263330] softirqs last disabled at (48818): [<ffffffff805c5b89>]
_write_lock_bh+0x9/0x30
[ 103.263333]
[ 103.263333] Call Trace:
[ 103.263335] [<ffffffff8024fc25>] down_read+0x15/0x40
[ 103.263338] [<ffffffff802507e6>] __blocking_notifier_call_chain+0x46/0x90
[ 103.263341] [<ffffffff80250f23>] pm_qos_add_requirement+0x93/0xf0
[ 103.263344] [<ffffffff804fdc4a>] snd_pcm_hw_params+0x2fa/0x380
[ 103.263347] [<ffffffff804fe93c>] snd_pcm_common_ioctl1+0xb4c/0xdc0
[ 103.263350] [<ffffffff8027b167>] __do_fault+0x227/0x470
[ 103.263353] [<ffffffff8025a435>] __lock_acquire+0x745/0x1140
[ 103.263357] [<ffffffff805c5e45>] _spin_unlock_irqrestore+0x55/0x70
[ 103.263359] [<ffffffff80259731>] trace_hardirqs_on+0xc1/0x160
[ 103.263362] [<ffffffff804fee88>] snd_pcm_playback_ioctl1+0x48/0x240
[ 103.263365] [<ffffffff804ffa36>] snd_pcm_playback_ioctl+0x36/0x50
[ 103.263367] [<ffffffff802a80bf>] vfs_ioctl+0x2f/0xa0
[ 103.263369] [<ffffffff802a8390>] do_vfs_ioctl+0x260/0x2e0
[ 103.263371] [<ffffffff80259731>] trace_hardirqs_on+0xc1/0x160
[ 103.263373] [<ffffffff802a84a1>] sys_ioctl+0x91/0xb0
[ 103.263376] [<ffffffff8020bc5e>] system_call+0x7e/0x83
[ 103.263379]
Torsten
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