[Bug 293382] Dead lock and kernel crash around closefp_impl

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 30 Mar 2026 13:04:25 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293382

--- Comment #30 from Paul <devgs@ukr.net> ---

Thank you for a prompt reply! We are definitely not tampering with the core
dump. And only using the HEAD + patch. No custom kernel modules, nothing like
that.

Curiously, may be just a coincidence, but I've noticed that 544408 - 138904 =
405504, which is a multiple of 4096. Specifically 99 * 4096. Could it be that
this is due to some hash-table optimization and them ending up in the same
bucket? This may explain why seemingly unrelated fds end up colliding somehow.
Though, may just be a coincidence. And 4096 seems a plausible 'magick number'
to be used somewhere. Like in a simplified hash function (remainder of
division) or just a result of an exponential HT growth with a factor of 2.

Regardless, we are now switching to HEAD with only the latest patch which you
provided. Thanks!

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