[Bug 287344] FBSD 14.2 again panics on sendfile with nginx or lightttpd

In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 287344] reopen Bug 217789: FBSD 14.2 again panics on sendfile with nginx or lightttpd"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 06 Jun 2025 16:07:02 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287344

--- Comment #5 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Michael Meiszl from comment #4)
The sysctl disables an optimization such that sendfile no longer uses "unmapped
mbufs".  This avoids a problem triggered by ipfw which results in a crash.

The sysctl can be added to /etc/sysctl.conf of course.  I think we should make
m_pullup() handle unmapped mbufs, since that's the heart of the problem, but I
haven't looked closely.  I hope Gleb can comment further.

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