[Bug 212168] [panic] [UFS] use-after-free panic (0xdeadc0dedeadc0de)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212168

--- Comment #9 from Andrew Turner <Andrew at FreeBSD.org> ---
I think you can add '-fno-optimize-sibling-calls' to CFLAGS to disable the tail
jumps, e.g. in sys/conf/Makefile.arm64.

>From my reading of the asm wk is valid, wk->wk_mp is invalid. The VFSTOUFS
macro contains:

#define VFSTOUFS(mp) ((struct ufsmount *)((mp)->mnt_data))

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