Re: BUG in btrfs_set_item_key_safe

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On Fri, Oct 26, 2012 at 06:30:06AM -0600, Jan Schmidt wrote:
> On Fri, October 26, 2012 at 14:19 (+0200), Chris Mason wrote:
> > On Fri, Oct 26, 2012 at 12:35:43AM -0600, Jan Schmidt wrote:
> >> Hi,
> >>
> >> while running extensive qgroup and tree mod log tests I got to the following
> >> BUG, which is probably not related to tree mod log:
> > 
> > So our keys are out of order...are you able to reproduce this?
> 
> No reproducer yet. My tests ran fine for about 15 hours before that happened.
> I'll have an extensive amount of (tree mod log related) debug information if I
> should get there again.
> 
> My guess is that it's not related to tree mod log, though, as there are tree log
> functions (fs/btrfs/tree-log.c) on the stack. I don't think rewinded buffers can
> make it there.
> 
> I'll call back when I'll hit this again.

This is more likely to be memory corruption.  I'd suggest turning on
slab debug and CONFIG_DEBUG_PAGE_ALLOC...hopefully you'll get a faster
crash.

-chris

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