On Fri, Sep 14, 2007 at 10:49:05AM +0100, Andy Whitcroft wrote:
> On Tue, Sep 11, 2007 at 06:30:49PM +0100, Andy Whitcroft wrote:
> > Annoyingly this seems to be intermittent, and I have not managed to get
> > a machine into this state again yet. Will keep trying.
>
> Ok, I have been completly unsuccessful in reproducing this. Dispite
> having two distinct machines showing this behaviour. I have neither
> been able to reproduce it with those machine on 2.6.23-rc6 nor has any
> of the testing of any of the -git releases which follow thrown this
> error. I have run about 10 repeats of the jobs which failed too and
> none of those have thrown the same error.
>
> It is pretty clear from the dbench output that the problem is/was real,
> that its not some artifact of the test harness. I am a loss as to how to
> get this to trigger again.
>
> I guess I will keep monitoring the ongoing tests for new instances. I
> will also look to getting the sysrq-* stuff triggered automatically on
> job timeout as that seems like a sane plan in all cases.
>
> Frustrated.
I have since had a single occurance of a hang on 2.6.23-rc6-mm1. As the
base is different I cannot for sure say its the same problem. In this
new event we had a mkfs hung in a 'D' wait:
=======================
mkfs.ext2 D c10220f4 0 6233 6222
c344fc80 00000082 00000286 c10220f4 c344fc90 002ed099 c2963340 c2b9f640
c142bce0 c2b9f640 c344fc90 002ed099 c344fcfc c344fcc0 c1219563 c1109bf2
c344fcc4 c186e4d4 c186e4d4 002ed099 c1022612 c2b9f640 c186e000 c104000c
Call Trace:
[<c10220f4>] lock_timer_base+0x19/0x35
[<c1219563>] schedule_timeout+0x70/0x8d
[<c1109bf2>] prop_fraction_single+0x37/0x5d
[<c1022612>] process_timeout+0x0/0x5
[<c104000c>] task_dirty_limit+0x3a/0xb5
[<c12194da>] io_schedule_timeout+0x1e/0x28
[<c10454b4>] congestion_wait+0x62/0x7a
[<c102b021>] autoremove_wake_function+0x0/0x33
[<c10402af>] get_dirty_limits+0x16a/0x172
[<c102b021>] autoremove_wake_function+0x0/0x33
[<c104040b>] balance_dirty_pages+0x154/0x1be
[<c103bda3>] generic_perform_write+0x168/0x18a
[<c103be38>] generic_file_buffered_write+0x73/0x107
[<c103c346>] __generic_file_aio_write_nolock+0x47a/0x4a5
[<c11b0fef>] do_sock_write+0x92/0x99
[<c11b1048>] sock_aio_write+0x52/0x5e
[<c103c3b9>] generic_file_aio_write_nolock+0x48/0x9b
[<c105d2d6>] do_sync_write+0xbf/0xfc
[<c102b021>] autoremove_wake_function+0x0/0x33
[<c1010311>] do_page_fault+0x2cc/0x739
[<c105d3a0>] vfs_write+0x8d/0x108
[<c105d4c3>] sys_write+0x41/0x67
[<c100260a>] syscall_call+0x7/0xb
=======================
-apw
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