* NLM mutex deadlock in 2.6.22.9
@ 2007-10-02 10:31 Frank van Maarseveen
2007-10-02 15:46 ` Trond Myklebust
0 siblings, 1 reply; 2+ messages in thread
From: Frank van Maarseveen @ 2007-10-02 10:31 UTC (permalink / raw)
To: Linux NFS mailing list
nlmsvc_lock() starts out with a
mutex_lock(&file->f_mutex);
and at some point via the garbage collector it calls mutex_lock()
again. alt-sysrq-t said:
lockd D ABD55800 0 4462 2 (L-TLB)
f6849d28 00000046 000ee6b2 abd55800 00000000 c0141ed3 c070daac 00157800
f779e900 00000000 f6f08f50 c0898154 f6f08a00 00000000 eefdb7d8 c2a21d80
f6f08a00 f6f08b0c 000186a0 3ee72980 000002ab 00000001 00000001 c0573e61
Call Trace:
[<c0573f32>] __mutex_lock_slowpath+0xb2/0x250
[<c0573e61>] mutex_lock+0x21/0x30
[<c0233ff9>] nlmsvc_traverse_blocks+0x29/0xa0
[<c0236589>] nlm_traverse_files+0x89/0x240
[<c02368eb>] nlmsvc_mark_resources+0x1b/0x30
[<c0233179>] nlm_gc_hosts+0x59/0x1a0
[<c02326f4>] nlm_lookup_host+0x44/0x350
[<c0232b3f>] nlmsvc_lookup_host+0x5f/0x70
nlmsvc_create_block() is inlined
[<c023433d>] nlmsvc_lock+0x14d/0x360
[<c023961a>] nlm4svc_proc_lock+0xea/0x140
[<c05600a0>] svc_process+0x320/0x700
[<c0233663>] lockd+0x133/0x270
[<c0105337>] kernel_thread_helper+0x7/0x10
--
Frank
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^ permalink raw reply [flat|nested] 2+ messages in thread* Re: NLM mutex deadlock in 2.6.22.9
2007-10-02 10:31 NLM mutex deadlock in 2.6.22.9 Frank van Maarseveen
@ 2007-10-02 15:46 ` Trond Myklebust
0 siblings, 0 replies; 2+ messages in thread
From: Trond Myklebust @ 2007-10-02 15:46 UTC (permalink / raw)
To: Frank van Maarseveen; +Cc: Linux NFS mailing list
On Tue, 2007-10-02 at 12:31 +0200, Frank van Maarseveen wrote:
> nlmsvc_lock() starts out with a
>
> mutex_lock(&file->f_mutex);
>
> and at some point via the garbage collector it calls mutex_lock()
> again. alt-sysrq-t said:
>
> lockd D ABD55800 0 4462 2 (L-TLB)
> f6849d28 00000046 000ee6b2 abd55800 00000000 c0141ed3 c070daac 00157800
> f779e900 00000000 f6f08f50 c0898154 f6f08a00 00000000 eefdb7d8 c2a21d80
> f6f08a00 f6f08b0c 000186a0 3ee72980 000002ab 00000001 00000001 c0573e61
> Call Trace:
> [<c0573f32>] __mutex_lock_slowpath+0xb2/0x250
> [<c0573e61>] mutex_lock+0x21/0x30
> [<c0233ff9>] nlmsvc_traverse_blocks+0x29/0xa0
> [<c0236589>] nlm_traverse_files+0x89/0x240
> [<c02368eb>] nlmsvc_mark_resources+0x1b/0x30
> [<c0233179>] nlm_gc_hosts+0x59/0x1a0
> [<c02326f4>] nlm_lookup_host+0x44/0x350
> [<c0232b3f>] nlmsvc_lookup_host+0x5f/0x70
> nlmsvc_create_block() is inlined
> [<c023433d>] nlmsvc_lock+0x14d/0x360
> [<c023961a>] nlm4svc_proc_lock+0xea/0x140
> [<c05600a0>] svc_process+0x320/0x700
> [<c0233663>] lockd+0x133/0x270
> [<c0105337>] kernel_thread_helper+0x7/0x10
The following fix has already been sent to stable@kernel.org...
http://client.linux-nfs.org/Linux-2.6.x/2.6.23-rc8/linux-2.6.23-001-fix_lockd_circular_dependency.dif
Trond
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2007-10-02 10:31 NLM mutex deadlock in 2.6.22.9 Frank van Maarseveen
2007-10-02 15:46 ` Trond Myklebust
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