linux-ext4 - Re: Fwd: Ext4 bug with fallocate

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Date:	Tue, 20 Oct 2009 21:20:18 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Fredrik Andersson <nablaman@...il.com>
CC:	linux-ext4@...r.kernel.org
Subject: Re: Fwd: Ext4 bug with fallocate

Fredrik Andersson wrote:
> Hi, here is the data for this process:

Including all of the processes in D state (everything reported by 
sysrq-w) would probably be most helpful.

Feel free to file an ext4 bug on bugzilla.kernel.org w/ this 
information, too, so it doesn't get lost in busy schedules ...

Thanks,
-Eric

> 5958816.744013] drdbmake      D ffff88021e4c7800     0 27019  13796
> [5958816.744013]  ffff8801d1bcda88 0000000000000082 ffff8801f4ce9bf0
> ffff8801678b1380
> [5958816.744013]  0000000000010e80 000000000000c748 ffff8800404963c0
> ffffffff81526360
> [5958816.744013]  ffff880040496730 00000000f4ce9bf0 000000025819cebe
> 0000000000000282
> [5958816.744013] Call Trace:
> [5958816.744013]  [<ffffffff813a9639>] schedule+0x9/0x20
> [5958816.744013]  [<ffffffff81177ea5>] start_this_handle+0x365/0x5d0
> [5958816.744013]  [<ffffffff8105b900>] ? autoremove_wake_function+0x0/
> 0x40
> [5958816.744013]  [<ffffffff811781ce>] jbd2_journal_restart+0xbe/0x150
> [5958816.744013]  [<ffffffff8116243d>] ext4_ext_truncate+0x6dd/0xa20
> [5958816.744013]  [<ffffffff81095b3b>] ? find_get_pages+0x3b/0xf0
> [5958816.744013]  [<ffffffff81150a78>] ext4_truncate+0x198/0x680
> [5958816.744013]  [<ffffffff810ac984>] ? unmap_mapping_range+0x74/0x280
> [5958816.744013]  [<ffffffff811772c0>] ? jbd2_journal_stop+0x1e0/0x360
> [5958816.744013]  [<ffffffff810acd25>] vmtruncate+0xa5/0x110
> [5958816.744013]  [<ffffffff810dda10>] inode_setattr+0x30/0x180
> [5958816.744013]  [<ffffffff8114d073>] ext4_setattr+0x173/0x310
> [5958816.744013]  [<ffffffff810ddc79>] notify_change+0x119/0x330
> [5958816.744013]  [<ffffffff810c6df3>] do_truncate+0x63/0x90
> [5958816.744013]  [<ffffffff810d0cc3>] ? get_write_access+0x23/0x60
> [5958816.744013]  [<ffffffff810c70cb>] sys_truncate+0x17b/0x180
> [5958816.744013]  [<ffffffff8100bfab>] system_call_fastpath+0x16/0x1b
> 
> Don't know if this has anything to do with it, but  I also noticed
> that another process of mine,
> which is working just fine, is executing a suspicious looking function
> called raid0_unplug.
> It operates on the same raid0/ext4 filesystem as the hung process. I
> include the calltrace for it here too:
> 
> [5958816.744013] nodeserv      D ffff880167bd7ca8     0 17900  13796
> [5958816.744013]  ffff880167bd7bf8 0000000000000082 ffff88002800a588
> ffff88021e5b56e0
> [5958816.744013]  0000000000010e80 000000000000c748 ffff880100664020
> ffffffff81526360
> [5958816.744013]  ffff880100664390 000000008119bd17 000000026327bfa9
> 0000000000000002
> [5958816.744013] Call Trace:
> [5958816.744013]  [<ffffffffa0039291>] ? raid0_unplug+0x51/0x70 [raid0]
> [5958816.744013]  [<ffffffff813a9639>] schedule+0x9/0x20
> [5958816.744013]  [<ffffffff813a9687>] io_schedule+0x37/0x50
> [5958816.744013]  [<ffffffff81095e35>] sync_page+0x35/0x60
> [5958816.744013]  [<ffffffff81095e69>] sync_page_killable+0x9/0x50
> [5958816.744013]  [<ffffffff813a99d2>] __wait_on_bit_lock+0x52/0xb0
> [5958816.744013]  [<ffffffff81095e60>] ? sync_page_killable+0x0/0x50
> [5958816.744013]  [<ffffffff81095d74>] __lock_page_killable+0x64/0x70
> [5958816.744013]  [<ffffffff8105b940>] ? wake_bit_function+0x0/0x40
> [5958816.744013]  [<ffffffff81095c0b>] ? find_get_page+0x1b/0xb0
> [5958816.744013]  [<ffffffff81097908>] generic_file_aio_read+0x3b8/0x6b0
> [5958816.744013]  [<ffffffff810c7dc1>] do_sync_read+0xf1/0x140
> [5958816.744013]  [<ffffffff8106a5e8>] ? do_futex+0xb8/0xb20
> [5958816.744013]  [<ffffffff813ab78f>] ? _spin_unlock_irqrestore+0x2f/0x40
> [5958816.744013]  [<ffffffff8105b900>] ? autoremove_wake_function+0x0/0x40
> [5958816.744013]  [<ffffffff8105bc73>] ? add_wait_queue+0x43/0x60
> [5958816.744013]  [<ffffffff81062a6c>] ? getnstimeofday+0x5c/0xf0
> [5958816.744013]  [<ffffffff810c85b8>] vfs_read+0xc8/0x170
> [5958816.744013]  [<ffffffff810c86fa>] sys_pread64+0x9a/0xa0
> [5958816.744013]  [<ffffffff8100bfab>] system_call_fastpath+0x16/0x1b
> 
> Hope this makes sense to anyone, and please let me know if there is
> more info I can provide.
> 
> /Fredrik
> 
> On Sun, Oct 18, 2009 at 5:57 PM, Eric Sandeen <sandeen@...hat.com> wrote:
>> Fredrik Andersson wrote:
>>> Hi, I'd like to report what I'm fairly certain is an ext4 bug. I hope
>>> this is the right place to do so.
>>>
>>> My program creates a big file (around 30 GB) with posix_fallocate (to
>>> utilize extents), fills it with data and uses ftruncate to crop it to
>>> its final size (usually somewhere between 20 and 25 GB).
>>> The problem is that in around 5% of the cases, the program locks up
>>> completely in a syscall. The process can thus not be killed even with
>>> kill -9, and a reboot is all that will do.
>> does echo w > /proc/sysrq-trigger (this does sleeping processes; or use echo t for all processes) show you where the stuck threads are?
>>
>> -Eric
>>

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