At Mon, 22 Jun 2009 16:54:39 +0200,
I wrote:
>
> At Mon, 22 Jun 2009 09:58:18 +0100,
> David Howells wrote:
> >
> > Christian Kujau <lists@xxxxxxxxxxxxxxx> wrote:
> >
> > > [ 399.332346] [<ffffffff810da03a>] ? ext3_truncate+0x26a/0x9e0
> >
> > Can you try the attached patch, please?
>
> I've got similar messages with the very latest Linus git tree,
> and tried you patch, but still gives the same error.
>
> The log is below. FWIW, it's on ext3.
The bug is still present on 2.6.31-rc2.
Takashi
>
>
> thanks,
>
> Takashi
>
> ===
>
> FS-Cache: Netfs 'nfs' registered for caching
>
> =======================================================
> [ INFO: possible circular locking dependency detected ]
> 2.6.30-test #7
> -------------------------------------------------------
> swapper/0 is trying to acquire lock:
> (&cwq->lock){-.-...}, at: [<c01519f3>] __queue_work+0x1f/0x4e
>
> but task is already holding lock:
> (&q->lock){-.-.-.}, at: [<c012cc9c>] __wake_up+0x26/0x5c
>
> which lock already depends on the new lock.
>
>
> the existing dependency chain (in reverse order) is:
>
> -> #1 (&q->lock){-.-.-.}:
> [<c0168746>] __lock_acquire+0xfd6/0x12d5
> [<c0168afc>] lock_acquire+0xb7/0xeb
> [<c03d1249>] _spin_lock_irqsave+0x3d/0x5e
> [<c012cc9c>] __wake_up+0x26/0x5c
> [<c0151053>] insert_work+0x7b/0x95
> [<c0151a02>] __queue_work+0x2e/0x4e
> [<c0151a5e>] delayed_work_timer_fn+0x3c/0x4f
> [<c014925b>] run_timer_softirq+0x180/0x206
> [<c01445cb>] __do_softirq+0xc3/0x18d
> [<c01446d9>] do_softirq+0x44/0x7a
> [<c0144823>] irq_exit+0x43/0x87
> [<c0117cbd>] smp_apic_timer_interrupt+0x7c/0x9b
> [<c0103956>] apic_timer_interrupt+0x36/0x40
> [<c0101ed0>] cpu_idle+0xa2/0xbe
> [<c03bcef6>] rest_init+0x66/0x79
> [<c0537a98>] start_kernel+0x396/0x3ae
> [<c053707f>] __init_begin+0x7f/0x98
> [<ffffffff>] 0xffffffff
>
> -> #0 (&cwq->lock){-.-...}:
> [<c0168496>] __lock_acquire+0xd26/0x12d5
> [<c0168afc>] lock_acquire+0xb7/0xeb
> [<c03d1249>] _spin_lock_irqsave+0x3d/0x5e
> [<c01519f3>] __queue_work+0x1f/0x4e
> [<c0151ab9>] queue_work_on+0x48/0x63
> [<c0151c1d>] queue_work+0x23/0x38
> [<c0151c50>] schedule_work+0x1e/0x31
> [<f7f9ed69>] fscache_enqueue_operation+0xc5/0x102 [fscache]
> [<f80b6142>] cachefiles_read_waiter+0xb3/0xcd [cachefiles]
> [<c01292ae>] __wake_up_common+0x4c/0x85
> [<c012ccae>] __wake_up+0x38/0x5c
> [<c015568f>] __wake_up_bit+0x34/0x4b
> [<c01ad459>] unlock_page+0x55/0x6a
> [<c020fb6b>] mpage_end_io_read+0x4e/0x71
> [<c020a4da>] bio_endio+0x31/0x44
> [<c027759c>] req_bio_endio+0xab/0xde
> [<c027774c>] blk_update_request+0x17d/0x321
> [<c0277912>] blk_update_bidi_request+0x22/0x62
> [<c02792c4>] blk_end_bidi_request+0x25/0x6e
> [<c0279371>] blk_end_request+0x1a/0x30
> [<f82811da>] scsi_io_completion+0x193/0x3bb [scsi_mod]
> [<f827a888>] scsi_finish_command+0xd9/0xf2 [scsi_mod]
> [<f8281522>] scsi_softirq_done+0xf4/0x10d [scsi_mod]
> [<c027fcdf>] blk_done_softirq+0x6f/0x8e
> [<c01445cb>] __do_softirq+0xc3/0x18d
> [<c01446d9>] do_softirq+0x44/0x7a
> [<c0144823>] irq_exit+0x43/0x87
> [<c01049fd>] do_IRQ+0x8d/0xb2
> [<c0103595>] common_interrupt+0x35/0x40
> [<c0101ed0>] cpu_idle+0xa2/0xbe
> [<c03bcef6>] rest_init+0x66/0x79
> [<c0537a98>] start_kernel+0x396/0x3ae
> [<c053707f>] __init_begin+0x7f/0x98
> [<ffffffff>] 0xffffffff
>
> other info that might help us debug this:
>
> 1 lock held by swapper/0:
> #0: (&q->lock){-.-.-.}, at: [<c012cc9c>] __wake_up+0x26/0x5c
>
> stack backtrace:
> Pid: 0, comm: swapper Not tainted 2.6.30-test #7
> Call Trace:
> [<c03cde42>] ? printk+0x1d/0x33
> [<c0167349>] print_circular_bug_tail+0xaf/0xcb
> [<c0168496>] __lock_acquire+0xd26/0x12d5
> [<c01519f3>] ? __queue_work+0x1f/0x4e
> [<c0168afc>] lock_acquire+0xb7/0xeb
> [<c01519f3>] ? __queue_work+0x1f/0x4e
> [<c01519f3>] ? __queue_work+0x1f/0x4e
> [<c03d1249>] _spin_lock_irqsave+0x3d/0x5e
> [<c01519f3>] ? __queue_work+0x1f/0x4e
> [<c01519f3>] __queue_work+0x1f/0x4e
> [<c0151ab9>] queue_work_on+0x48/0x63
> [<c0151c1d>] queue_work+0x23/0x38
> [<c0151c50>] schedule_work+0x1e/0x31
> [<f7f9ed69>] fscache_enqueue_operation+0xc5/0x102 [fscache]
> [<f80b6142>] cachefiles_read_waiter+0xb3/0xcd [cachefiles]
> [<c01292ae>] __wake_up_common+0x4c/0x85
> [<c012ccae>] __wake_up+0x38/0x5c
> [<c015568f>] __wake_up_bit+0x34/0x4b
> [<c01ad459>] unlock_page+0x55/0x6a
> [<c020fb6b>] mpage_end_io_read+0x4e/0x71
> [<c020a4da>] bio_endio+0x31/0x44
> [<c027759c>] req_bio_endio+0xab/0xde
> [<c027774c>] blk_update_request+0x17d/0x321
> [<c0277912>] blk_update_bidi_request+0x22/0x62
> [<c02792c4>] blk_end_bidi_request+0x25/0x6e
> [<c0279371>] blk_end_request+0x1a/0x30
> [<f82811da>] scsi_io_completion+0x193/0x3bb [scsi_mod]
> [<c0166b5b>] ? trace_hardirqs_on+0x19/0x2c
> [<f8280f43>] ? scsi_device_unbusy+0x92/0xaa [scsi_mod]
> [<f827a888>] scsi_finish_command+0xd9/0xf2 [scsi_mod]
> [<f8281522>] scsi_softirq_done+0xf4/0x10d [scsi_mod]
> [<c027fcdf>] blk_done_softirq+0x6f/0x8e
> [<c01445cb>] __do_softirq+0xc3/0x18d
> [<c01446d9>] do_softirq+0x44/0x7a
> [<c0144823>] irq_exit+0x43/0x87
> [<c01049fd>] do_IRQ+0x8d/0xb2
> [<c0103595>] common_interrupt+0x35/0x40
> [<c0109860>] ? mwait_idle+0x98/0xec
> [<c0101ed0>] cpu_idle+0xa2/0xbe
> [<c03bcef6>] rest_init+0x66/0x79
> [<c0537a98>] start_kernel+0x396/0x3ae
> [<c053707f>] __init_begin+0x7f/0x98
> Pid: 2282, comm: kslowd Not tainted 2.6.30-test #7
> Call Trace:
> [<f80b60e9>] cachefiles_read_waiter+0x5a/0xcd [cachefiles]
> [<c01292ae>] __wake_up_common+0x4c/0x85
> [<c012ccae>] __wake_up+0x38/0x5c
> [<c015568f>] __wake_up_bit+0x34/0x4b
> [<c01ad459>] unlock_page+0x55/0x6a
> [<f8b3de99>] ext3_truncate+0x40f/0x79d [ext3]
> [<c0166b5b>] ? trace_hardirqs_on+0x19/0x2c
> [<c01c50d6>] ? vmtruncate+0xe3/0x12e
> [<c01c50ec>] vmtruncate+0xf9/0x12e
> [<c01fa209>] inode_setattr+0x67/0x149
> [<f8b3b719>] ext3_setattr+0x170/0x1c6 [ext3]
> [<c01fa463>] notify_change+0x178/0x2c9
> [<c03cf97e>] ? mutex_lock_nested+0x259/0x272
> [<f80b367d>] cachefiles_attr_changed+0x16f/0x1ef [cachefiles]
> [<f80b367d>] ? cachefiles_attr_changed+0x16f/0x1ef [cachefiles]
> [<f80b3cb9>] cachefiles_lookup_object+0x92/0xc1 [cachefiles]
> [<f7f9e235>] fscache_lookup_object+0xe9/0x10d [fscache]
> [<f7f9e6e4>] fscache_object_slow_work_execute+0x1b4/0x65e [fscache]
> [<c0166b5b>] ? trace_hardirqs_on+0x19/0x2c
> [<c01a64a9>] slow_work_thread+0x25a/0x435
> [<c01556e3>] ? autoremove_wake_function+0x0/0x50
> [<c01a624f>] ? slow_work_thread+0x0/0x435
> [<c01553b9>] kthread+0x71/0x76
> [<c0155348>] ? kthread+0x0/0x76
> [<c0103be7>] kernel_thread_helper+0x7/0x10
> CacheFiles: I/O Error: Readpage failed on backing file 10000810
> FS-Cache: Cache cachefiles stopped due to I/O error
> --
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