[Bug 248245] arm64 kernel panic under heavy UFS writes (getblk -> ffs_balloc_ufs2)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248245

Mark Johnston <markj at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |mjg at FreeBSD.org

--- Comment #7 from Mark Johnston <markj at FreeBSD.org> ---
I think the problem is in r363415.  It converted some lockmgr code to use
atomic_fcmpset instead of atomic_cmpset.  The former can fail spuriously on
LL/SC platforms, so a tryxlock operation can fail even when the buf is
unlocked.  lockmgr should take care to retry if fcmpset fails but returns the
"expected" value.

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