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Subject2.6.16.32 stuck in generic_file_aio_write()


I've got a machine which occasionally locks up. I can still sysrq it from
a serial console, so it's not entirely dead.

A sysrq-t learns me that it's got a large number of httpd processes stuck
in D state :

httpd D F7619440 2160 11635 2057 11636 (NOTLB)
dbb7ae14 cc9b0550 c33224a0 f7619440 de187604 00000000 000000b3 00000001
000000b3 00000000 ffffffff d374a550 c33224a0 0005b8d8 f04af800
d374a550 cc9b0550 cc9b0678 ef7d33ec ef7d33e8 cc9b0550 ef7d33fc
Call Trace:
[<c041bf70>] __mutex_lock_slowpath+0x92/0x43e
[<c0148f29>] generic_file_aio_write+0x5c/0xfa
[<c0148f29>] generic_file_aio_write+0x5c/0xfa
[<c0148f29>] generic_file_aio_write+0x5c/0xfa
[<c01746c9>] permission+0xad/0xcb
[<c01d9c4a>] ext3_file_write+0x3b/0xb0
[<c0166777>] do_sync_write+0xd5/0x130
[<c041d1bf>] _spin_unlock+0xb/0xf
[<c0135c13>] autoremove_wake_function+0x0/0x4b
[<c0166975>] vfs_write+0x1a3/0x1a8
[<c0166a39>] sys_write+0x4b/0x74
[<c0102c03>] sysenter_past_esp+0x54/0x75

After this, the machine is rendered useless (probably due to the fact that
disk IO isn't working anymore).

The lock debugging gives me this :

D httpd:11635 [cc9b0550, 116] blocked on mutex: [ef7d33e8]
.. held by: httpd: 506 [d67e1000, 121]
... acquired at: generic_file_aio_write+0x5c/0xfa

I see similiar things as mentioned in,
with the difference that I'm not running software RAID or SATA (it's an
Areca ARC-1110).

I can't reproduce it until now, it 'just' happens. Can someone give me a
pointer where to start looking ?

Erich, I've CC-ed you since the machine is running an Areca RAID config.
It's also the only used disk subsystem in this machine.



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