Re: [linux-next:master] [xfs] 7f2f7531e0: BUG:KASAN:slab-use-after-free_in_xfs_defer_finish_recovery

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To: kernel test robot <oliver.sang@xxxxxxxxx>
Subject: Re: [linux-next:master] [xfs] 7f2f7531e0: BUG:KASAN:slab-use-after-free_in_xfs_defer_finish_recovery
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 27 Dec 2023 08:26:28 +0100
Cc: Christoph Hellwig <hch@xxxxxx>, oe-lkp@xxxxxxxxxxxxxxx, lkp@xxxxxxxxx, Linux Memory Management List <linux-mm@xxxxxxxxx>, Chandan Babu R <chandanbabu@xxxxxxxxxx>, "Darrick J. Wong" <djwong@xxxxxxxxxx>, linux-xfs@xxxxxxxxxxxxxxx
In-reply-to: <202312271458.851834a0-oliver.sang@intel.com>
References: <202312271458.851834a0-oliver.sang@intel.com>
User-agent: Mutt/1.5.17 (2007-11-01)

It looks like the tracepoint will access dfp after it has already
been freed.  The fix is to simply add (back) a local variable for ops.
I'll cook up a patch.

References:
- [linux-next:master] [xfs] 7f2f7531e0: BUG:KASAN:slab-use-after-free_in_xfs_defer_finish_recovery
  - From: kernel test robot

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