Re: [lkp] [parallel lookups machinery, part 2] 96352435af: kernel BUG at mm/slab.c:2599!

From	Al Viro <viro@ZenIV.linux.org.uk>
Newsgroups	linux.kernel
Subject	Re: [lkp] [parallel lookups machinery, part 2] 96352435af: kernel BUG at mm/slab.c:2599!
Date	2016-04-18 04:00 +0200
Message-ID	<rp6DN-5xU-11@gated-at.bofh.it> (permalink)
References	<rp5Rn-55Q-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Mon, Apr 18, 2016 at 09:06:35AM +0800, kernel test robot wrote:
> FYI, we noticed the below changes on
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git testing.lookups
> commit 96352435afd792d713ec91e2d5693bdcf40a6b03 ("parallel lookups machinery, part 2")

Very odd.  All stores in that commit are to ->d_parent->d_inode->i_dir_seq
of in-lookup dentries.  And if ->d_parent in those gets buggered, we were
really deep in trouble.  Could you try to reproduce that without __d_move()
or __d_add() parts and see which one ends up triggering that crap?

Note that we don't *use* ->i_dir_seq yet...

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Re: [lkp] [parallel lookups machinery, part 2] 96352435af: kernel  BUG at mm/slab.c:2599! Al Viro <viro@ZenIV.linux.org.uk> - 2016-04-18 04:00 +0200
  Re: [LKP] [lkp] [parallel lookups machinery, part 2] 96352435af: kernel BUG at mm/slab.c:2599! "Huang\, Ying" <ying.huang@intel.com> - 2016-04-18 04:10 +0200
    Re: [LKP] [lkp] [parallel lookups machinery, part 2] 96352435af:  kernel BUG at mm/slab.c:2599! Al Viro <viro@ZenIV.linux.org.uk> - 2016-04-18 04:20 +0200
      Re: [LKP] [lkp] [parallel lookups machinery, part 2] 96352435af: kernel BUG at mm/slab.c:2599! "Huang\, Ying" <ying.huang@intel.com> - 2016-04-18 09:20 +0200
        Re: [LKP] [lkp] [parallel lookups machinery, part 2] 96352435af:  kernel BUG at mm/slab.c:2599! Al Viro <viro@ZenIV.linux.org.uk> - 2016-04-18 13:20 +0200

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