Re: dentry UAF bugs crashing arm64 machines on 6.5/6.6?

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On Tue, Sep 12, 2023 at 10:30:26AM -0700, Darrick J. Wong wrote:
> Hi everyone,
> Shortly after 6.5 was tagged, I started seeing the following stacktraces
> when running xfs through fstests on arm64.  Curiously, x86_64 does not
> seem affected.
> At first I thought this might be caused by the bug fixes in my
> development tree, so I started bisecting them.  Bisecting identified a
> particular patchset[1] that didn't seem like it was the culprit.  A
> couple of days later, one of my arm64 vms with that patch reverted
> crashed in the same way.  So, clearly not the culprit.

I would suggest that this is the same problem as being reported

due to some kind of screwup with hash_bl_lock() getting broken on
arm64 by commit 9257959a6e5b ("locking/atomic: scripts: restructure
fallback ifdeffery").



Dave Chinner

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