[Bug 238870] sys.netpfil.pf.names.names and sys.netpfil.pf.synproxy.synproxy cause panic

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238870

Kristof Provost <kp at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kp at freebsd.org

--- Comment #1 from Kristof Provost <kp at freebsd.org> ---
The backtrace suggests this is an epair teardown problem:

panic: epair_qflush: ifp=0xfffff80063f15800, epair_softc gone? sc=0

cpuid = 0
time = 1561746423
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0024260750
vpanic() at vpanic+0x19d/frame 0xfffffe00242607a0
panic() at panic+0x43/frame 0xfffffe0024260800
epair_qflush() at epair_qflush+0x1ba/frame 0xfffffe0024260850
if_down() at if_down+0x11d/frame 0xfffffe0024260880
if_detach_internal() at if_detach_internal+0x704/frame 0xfffffe0024260900
if_vmove() at if_vmove+0x3c/frame 0xfffffe0024260950
vnet_if_return() at vnet_if_return+0x48/frame 0xfffffe0024260970
vnet_destroy() at vnet_destroy+0x124/frame 0xfffffe00242609a0
prison_deref() at prison_deref+0x29d/frame 0xfffffe00242609e0
taskqueue_run_locked() at taskqueue_run_locked+0x10c/frame 0xfffffe0024260a40
taskqueue_thread_loop() at taskqueue_thread_loop+0x88/frame 0xfffffe0024260a70
fork_exit() at fork_exit+0x84/frame 0xfffffe0024260ab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0024260ab0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---

The pf tests create and destroy many epair interfaces as they start up and stop
vnet jails.

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