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

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

--- Comment #11 from Andrew Turner <Andrew at FreeBSD.org> ---
I see that WORKLIST_INSERT will set ONWORKLIST in wk_state. Is this always
locked? The existence of WORKLIST_INSERT_UNLOCKED seems to imply it's not. As
arm64 has a weaker memory model than x86 the ordering of setting this bit and
adding the item to the list is not guaranteed.

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