[Bug 270816] kernel panic in sym_hipd.c

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270816

--- Comment #8 from Marius Strobl <marius@FreeBSD.org> ---
Interesting that sym(4) still has use. The information provided is very
limited and the setup non-trivial to reproduce. However, this smells like
memory corruption. Especially, since sym_complete_ok() is preceded by a
- thought to be - memory barrier, but which actually is a NOP on x86 so
far with the assumption of its unnecessity not holding in the MP case.
This might be even more vulnerable in a virtualized environment.
You might want to give the patch in attachment 266994 a try.

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