[Bug 283807] panic: Fatal trap 12: page fault while in kernel mode on FreeBSD-14.2-RELEASE

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283807

Mark Millard <marklmi26-fbsd@yahoo.com> changed:

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                 CC|                            |marklmi26-fbsd@yahoo.com

--- Comment #1 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
More context from Discord's FreeBSD kernel Channel:

JordanG: Okay, the code is buggy. umtx_pi_alloc(M_NOWAIT) is called. The flag
M_NOWAITmeans that NULL is returned if the memory allocation request cannot be
satisfied immediately. The call to the memory allocation routine uma_zalloc
fails and returns NULL.  umtx_pi_alloc() receives the NULL pointer and
immediately, without checking it, tries to access a structure's field via the
pointer.

And also:

JordanG: @maxfx You've discovered a genuine bug that is also present in FreeBSD
15-CURRENT.

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