Messages in this thread | | | From | Haar János <> | Subject | Re: xfslogd-spinlock bug? | Date | Tue, 19 Dec 2006 00:39:46 +0100 |
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----- Original Message ----- From: "David Chinner" <dgc@sgi.com> To: "Haar János" <djani22@netcenter.hu> Cc: "David Chinner" <dgc@sgi.com>; <linux-xfs@oss.sgi.com>; <linux-kernel@vger.kernel.org> Sent: Monday, December 18, 2006 11:36 PM Subject: Re: xfslogd-spinlock bug?
> On Mon, Dec 18, 2006 at 09:17:50AM +0100, Haar János wrote: > > From: "David Chinner" <dgc@sgi.com> > > > > The NBD serves through eth1, and it is on the CPU3, but the ide0 is on > > the > > > > CPU0. > > > > > > I'd say your NBD based XFS filesystem is having trouble. > > > > > > > > Are you using XFS on a NBD? > > > > > > > > Yes, on the 3. source. > > > > > > Ok, I've never heard of a problem like this before and you are doing > > > something that very few ppl are doing (i.e. XFS on NBD). I'd start > > > Hence I'd start by suspecting a bug in the NBD driver. > > > > Ok, if you have right, this also can be in context with the following issue: > > > > http://download.netcenter.hu/bughunt/20061217/messages.txt (10KB) > > Which appears to be a crash in wake_up_process() when doing memory > reclaim (waking the xfsbufd).
Sorry, can you translate it to "poor mans language"? :-) This is a different bug?
> > > > > > > Dec 16 12:08:36 dy-base RSP: 0018:ffff81011fdedbc0 EFLAGS: 00010002 > > > > > > Dec 16 12:08:36 dy-base RAX: 0000000000000033 RBX: 6b6b6b6b6b6b6b6b > > RCX: > > > > > ^^^^^^^^^^^^^^^^ > > > > > Anyone recognise that pattern? > > Ok, I've found this pattern: > > #define POISON_FREE 0x6b > > Can you confirm that you are running with CONFIG_DEBUG_SLAB=y?
Yes, i build with this option enabled. Is this wrong?
> > If so, we have a use after free occurring here and it would also > explain why no-one has reported it before. > > FWIW, can you turn on CONFIG_XFS_DEBUG=y and see if that triggers > a different bug check prior to the above dump?
[root@X64 linux-2.6.19]# make bzImage scripts/kconfig/conf -s arch/x86_64/Kconfig .config:7:warning: trying to assign nonexistent symbol XFS_DEBUG
I have missed something?
Thanks,
Janos
> > Cheers, > > Dave. > -- > Dave Chinner > Principal Engineer > SGI Australian Software Group
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