[Bug 275169] Panic: rw_rlock: wlock already held for tcpinp @ /usr/src/sys/netinet/in_pcb.c:2529

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275169

Mark Johnston <markj@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |markj@FreeBSD.org
             Status|New                         |Open

--- Comment #11 from Mark Johnston <markj@FreeBSD.org> ---
I'm fairly sure the problem isn't fixed in 14.0.  tcp_output() and ip_output()
may transmit a packet while holding the inpcb lock, and the pfil hook in
ether_output_frame() doesn't know this, so when ipfw does a jail/user/group
match, it tries to look up the inpcb and re-locks it, resulting in recursion.

Actually, I am a bit surprised that TCP/IP layers hold onto the PCB lock while
calling into lower layers.

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