Re: 2.6.19-rc2-mm1

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Badari Pulavarty wrote:
On Thu, 2006-10-19 at 03:32 +1000, Nick Piggin wrote:

Badari Pulavarty wrote:

On Thu, 2006-10-19 at 01:48 +1000, Nick Piggin wrote:

Badari Pulavarty wrote:

On Mon, 2006-10-16 at 23:06 -0700, Andrew Morton wrote:

- Added the hwmon and i2c trees to the -mm lineup.  These are quilt-style
trees, maintained by Jean Delvare.

LTP writev tests seems to lockup the machine. reiserfs issue ?


BUG: soft lockup detected on CPU#2!

Call Trace:
<IRQ>  [<ffffffff8024a4ba>] softlockup_tick+0xfa/0x120
[<ffffffff8022e10f>] __do_softirq+0x5f/0xd0
[<ffffffff80232067>] update_process_times+0x57/0x90
[<ffffffff80217e84>] smp_local_timer_interrupt+0x34/0x60
[<ffffffff802185db>] smp_apic_timer_interrupt+0x4b/0x80
[<ffffffff80326ce0>] __copy_user_nocache+0x20/0x150
[<ffffffff8020a7e6>] apic_timer_interrupt+0x66/0x70
<EOI>  [<ffffffff802b8de0>] reiserfs_get_block+0x0/0x10c0
[<ffffffff80295198>] __block_prepare_write+0x158/0x470
[<ffffffff802b8de0>] reiserfs_get_block+0x0/0x10c0
[<ffffffff802954ca>] block_prepare_write+0x1a/0x30
[<ffffffff802b7cea>] reiserfs_prepare_write+0xca/0x140
[<ffffffff8024e9d2>] generic_file_buffered_write+0x2b2/0x610

This is likely to be a reiserfs interaction with the pagecache write
deadlock fixes. Chris Mason just now identified a couple of issues
and is going to work on a fix.

No. seems to be generic issue .. (happens with ext3 also) :(

I think I may have missed a fix for ext3 ordered and journalled too
(I've just sent a patch to Andrew privately).

Sorry. Can you try with ext2?

No luck with ext2 either ..

Hmm OK, it could be an issue with the way the iovecs are being walked. Maybe.
I wouldn't have thought that should fire the softlockup detector though.
It could walk a large number of iovec segments (4096) with preempt disabled,
but that's not 10s worth.

And it looks like it is getting stuck in commit_write (but the traces are
a bit wonky, could be some faults happening too).

Do you have CONFIG_DEBUG_VM turned on? (hmm, I notice fault_in_pages_readable
in that case should be have a 2nd argument of seglen rather than bytes, but
that shouldn't be causing your problem)

SUSE Labs, Novell Inc.
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