[Bug 233535] Machines lost ping6 after adding same IPv6 address

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233535

--- Comment #16 from Andrey V. Elsukov <ae at FreeBSD.org> ---
Unread portion of the kernel message buffer:
panic: Assertion inm->in6m_refcount > 0 failed at
/home/devel/freebsd/base/head/sys/netinet6/in6_mcast.c:636
cpuid = 0
time = 1545140639
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00779ce740
vpanic() at vpanic+0x1a3/frame 0xfffffe00779ce7a0
panic() at panic+0x43/frame 0xfffffe00779ce800
in6m_disconnect() at in6m_disconnect+0x21b/frame 0xfffffe00779ce830
mld_fasttimo() at mld_fasttimo+0x7d7/frame 0xfffffe00779ce900
pffasttimo() at pffasttimo+0x54/frame 0xfffffe00779ce930
softclock_call_cc() at softclock_call_cc+0x141/frame 0xfffffe00779ce9e0
softclock() at softclock+0x7c/frame 0xfffffe00779cea10
ithread_loop() at ithread_loop+0x187/frame 0xfffffe00779cea70
fork_exit() at fork_exit+0x84/frame 0xfffffe00779ceab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00779ceab0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic

__curthread () at ./machine/pcpu.h:230
230             __asm("movq %%gs:%P1,%0" : "=r" (td) : "n"
(OFFSETOF_CURTHREAD));
(kgdb) bt
#0  __curthread () at ./machine/pcpu.h:230
#1  doadump (textdump=-1791303680) at
/home/devel/freebsd/base/head/sys/kern/kern_shutdown.c:371
#2  0xffffffff80466d7c in db_fncall_generic (addr=<optimized out>,
rv=<optimized out>, nargs=<optimized out>, args=<optimized out>)
    at /home/devel/freebsd/base/head/sys/ddb/db_command.c:609
#3  db_fncall (dummy1=<optimized out>, dummy2=<optimized out>,
dummy3=<optimized out>, dummy4=<optimized out>)
    at /home/devel/freebsd/base/head/sys/ddb/db_command.c:657
#4  0xffffffff804668b9 in db_command (last_cmdp=<optimized out>,
cmd_table=<optimized out>, dopager=<optimized out>)
    at /home/devel/freebsd/base/head/sys/ddb/db_command.c:481
#5  0xffffffff80466634 in db_command_loop () at
/home/devel/freebsd/base/head/sys/ddb/db_command.c:534
#6  0xffffffff8046984f in db_trap (type=<optimized out>, code=<optimized out>)
at /home/devel/freebsd/base/head/sys/ddb/db_main.c:252
#7  0xffffffff80bf1365 in kdb_trap (type=3, code=0, tf=<optimized out>) at
/home/devel/freebsd/base/head/sys/kern/subr_kdb.c:692
#8  0xffffffff81076f76 in trap (frame=0xfffffe00779ce670) at
/home/devel/freebsd/base/head/sys/amd64/amd64/trap.c:619
#9  <signal handler called>
#10 kdb_enter (why=0xffffffff8130f382 "panic", msg=<optimized out>) at
/home/devel/freebsd/base/head/sys/kern/subr_kdb.c:479
#11 0xffffffff80ba8e10 in vpanic (fmt=<optimized out>, ap=0xfffffe00779ce7e0)
at /home/devel/freebsd/base/head/sys/kern/kern_shutdown.c:866
#12 0xffffffff80ba8bb3 in panic (fmt=0xffffffff81e95368 <cnputs_mtx>
"\340\066-\201\377\377\377\377") at
/home/devel/freebsd/base/head/sys/kern/kern_shutdown.c:804
#13 0xffffffff80dee39b in in6m_disconnect (inm=0xfffff80003a04d00) at
/home/devel/freebsd/base/head/sys/netinet6/in6_mcast.c:636
#14 0xffffffff80e02117 in mld_fasttimo_vnet () at
/home/devel/freebsd/base/head/sys/netinet6/mld6.c:1611
#15 mld_fasttimo () at /home/devel/freebsd/base/head/sys/netinet6/mld6.c:1317
#16 0xffffffff80c36a04 in pffasttimo (arg=0xffffffff81e95368 <cnputs_mtx>) at
/home/devel/freebsd/base/head/sys/kern/uipc_domain.c:521
#17 0xffffffff80bc2101 in softclock_call_cc (c=0xffffffff81314b74,
cc=0xffffffff820acb40 <cc_cpu>, direct=<optimized out>)
    at /home/devel/freebsd/base/head/sys/kern/kern_timeout.c:731
#18 0xffffffff80bc24bc in softclock (arg=0xffffffff820acb40 <cc_cpu>) at
/home/devel/freebsd/base/head/sys/kern/kern_timeout.c:869
#19 0xffffffff80b6bb07 in intr_event_execute_handlers (p=<optimized out>,
ie=<optimized out>) at /home/devel/freebsd/base/head/sys/kern/kern_intr.c:1119
#20 ithread_execute_handlers (p=<optimized out>, ie=<optimized out>) at
/home/devel/freebsd/base/head/sys/kern/kern_intr.c:1132
#21 ithread_loop (arg=<optimized out>) at
/home/devel/freebsd/base/head/sys/kern/kern_intr.c:1212
#22 0xffffffff80b687f4 in fork_exit (callout=0xffffffff80b6b980 <ithread_loop>,
arg=0xfffff800035f1dc0, frame=0xfffffe00779ceac0)
    at /home/devel/freebsd/base/head/sys/kern/kern_fork.c:1009
#23 <signal handler called>

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