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Date:      Wed, 23 Jan 2019 23:19:00 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 235097] ci runs panic with use-after-free when running sys/netpfil/pf/nat tests
Message-ID:  <bug-235097-7501-g8deCeWP2c@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-235097-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-235097-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D235097

--- Comment #6 from Kristof Provost <kp@freebsd.org> ---
I'm running into a different panic trying to reproduce this one:

Fatal trap 9: general protection fault while in kernel mode
cpuid =3D 4; apic id =3D 04
instruction pointer     =3D 0x20:0xffffffff80d07e9a
stack pointer           =3D 0x28:0xfffffe0074beb6a0
frame pointer           =3D 0x28:0xfffffe0074beb770
code segment            =3D base 0x0, limit 0xfffff, type 0x1b
                        =3D DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        =3D interrupt enabled, resume, IOPL =3D 0
current process         =3D 0 (config_0)
trap number             =3D 9
panic: general protection fault
cpuid =3D 4
time =3D 1548285422
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0074beb=
3b0
vpanic() at vpanic+0x1b4/frame 0xfffffe0074beb410
panic() at panic+0x43/frame 0xfffffe0074beb470
trap_fatal() at trap_fatal+0x369/frame 0xfffffe0074beb4c0
trap() at trap+0x6c/frame 0xfffffe0074beb5d0
calltrap() at calltrap+0x8/frame 0xfffffe0074beb5d0
--- trap 0x9, rip =3D 0xffffffff80d07e9a, rsp =3D 0xfffffe0074beb6a0, rbp =
=3D
0xfffffe0074beb770 ---
rtsock_msg_mbuf() at rtsock_msg_mbuf+0xda/frame 0xfffffe0074beb770
rt_newmaddrmsg() at rt_newmaddrmsg+0x108/frame 0xfffffe0074beb820
if_delmulti_locked() at if_delmulti_locked+0x74/frame 0xfffffe0074beb860
if_delmulti_ifma_flags() at if_delmulti_ifma_flags+0x5f/frame
0xfffffe0074beb890
in6m_release_task() at in6m_release_task+0x30e/frame 0xfffffe0074beb8f0
gtaskqueue_run_locked() at gtaskqueue_run_locked+0xf9/frame 0xfffffe0074beb=
940
gtaskqueue_thread_loop() at gtaskqueue_thread_loop+0x88/frame
0xfffffe0074beb970
fork_exit() at fork_exit+0x84/frame 0xfffffe0074beb9b0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0074beb9b0
--- trap 0, rip =3D 0, rsp =3D 0, rbp =3D 0 ---
KDB: enter: panic

I thought that might have been fixed by mark's r 343363 fix for 234296, but
that doesn't appear to be the case.

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