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Subject: [Bug 229331] panic: refcount == 0 in in6m_release_deferred()
Date: Mon, 25 Jun 2018 09:21:35 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: CURRENT
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: Affects Only Me
X-Bugzilla-Who: markj@FreeBSD.org
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D229331

            Bug ID: 229331
           Summary: panic: refcount =3D=3D 0 in in6m_release_deferred()
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: markj@FreeBSD.org

I got the following panic shortly after resuming my laptop, when it=20=20=
=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
                                              associated with a local wifi
network.  This was on r335190, and I=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
             haven't seen any relevant-looking commits since then.  I can=
=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
                                        provide more info from the dump if
needed.

(kgdb) bt=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
                                                                 #0=20
__curthread () at ./machine/pcpu.h:226=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
                                                             #1  doadump
(textdump=3D<optimized out>) at
/usr/home/markj/src/freebsd-dev/sys/kern/kern_shutdown.c:366=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
                       #2  0x0098ec7e in db_dump (dummy=3D13334586, dummy2=
=3Dfalse,
dummy3=3D-1, dummy4=3D0x18ebb744 "") at
/usr/home/markj/src/freebsd-dev/sys/ddb/db_command.c:574
#3  0x0098ea57 in db_command (last_cmdp=3D<optimized out>, cmd_table=3D<opt=
imized
out>, dopager=3D<optimized out>) at
/usr/home/markj/src/freebsd-dev/sys/ddb/db_command.c:481
#4  0x0098e7b0 in db_command_loop () at
/usr/home/markj/src/freebsd-dev/sys/ddb/db_command.c:534=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
                         #5  0x009919ed in db_trap (type=3D3, code=3D0) at
/usr/home/markj/src/freebsd-dev/sys/ddb/db_main.c:252=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
#6  0x00cb7fee in kdb_trap (type=3D3, code=3D0, tf=3D0x18ebb97c) at
/usr/home/markj/src/freebsd-dev/sys/kern/subr_kdb.c:697=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
#7  0x010261c7 in trap (frame=3D0x18ebb97c) at
/usr/home/markj/src/freebsd-dev/sys/i386/i386/trap.c:712=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
#8  0xffc0315d in ?? ()=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
#9  0x18ebb97c in ??=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
#10 0x00c6e594 in vpanic (fmt=3D0x10f0aeb "refcount =3D=3D %d inm: %p", ap=
=3D0x18ebba30
"") at /usr/home/markj/src/freebsd-dev/sys/kern/kern_shutdown.c:852
#11 0x00c6e3a0 in kassert_panic (fmt=3D0x10f0aeb "refcount =3D=3D %d inm: %=
p") at
/usr/home/markj/src/freebsd-dev/sys/kern/kern_shutdown.c:749=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20
                                                                     #12
0x00ea9b3b in in6m_release_deferred (inm=3D0x198f1080) at
/usr/home/markj/src/freebsd-dev/sys/netinet6/in6_mcast.c:628=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
     #13 0x00eaadc2 in in6_leavegroup_locked (inm=3D0x198f1080, imf=3D<opti=
mized
out>) at /usr/home/markj/src/freebsd-dev/sys/netinet6/in6_mcast.c:1394=20=
=20=20=20=20=20=20=20=20=20
#14 0x00eaaf81 in in6_leavegroup (inm=3D0x198f1080, imf=3D<optimized out>) =
at
/usr/home/markj/src/freebsd-dev/sys/netinet6/in6_mcast.c:1326=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20
                                                                       #15
0x00eaaf81 in inp_gcmoptions (ctx=3D0x1ebf80f4)=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20
#16 0x00cb2cfb in epoch_call_task (arg=3D0x0) at
/usr/home/markj/src/freebsd-dev/sys/kern/subr_epoch.c:616=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
#17 0x00cb6637 in gtaskqueue_run_locked (queue=3D0x1710c600) at
/usr/home/markj/src/freebsd-dev/sys/kern/subr_gtaskqueue.c:332=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20
#18 0x00cb6317 in gtaskqueue_thread_loop (arg=3D0x17184834) at
/usr/home/markj/src/freebsd-dev/sys/kern/subr_gtaskqueue.c:507=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20
#19 0x00c2b17e in fork_exit (callout=3D0xcb6270 <gtaskqueue_thread_loop>,
arg=3D0x17184834, frame=3D0x18ebbba8) at
/usr/home/markj/src/freebsd-dev/sys/kern/kern_fork.c:1039

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