Re: 2.6.19-rc2-mm1

[Nick Piggin <nickpiggin@yahoo.com.au>]

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:
> > > > >
> > > > >
> > > > >
> > > > > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.19-rc2/2.6.19-rc2-mm1/
> > > > > >
> > > > > >
> > > > > > - 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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