From owner-freebsd-stable@freebsd.org  Mon Apr 15 13:31:18 2019
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To: FreeBSD stable <freebsd-stable@freebsd.org>
Subject: Panic during reboot involving softclock_call_cc(), nd6_timer() and
 nd6_dad_start()
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Hi,

Has anyone else witnessed a panic during reboot involving 
softclock_call_cc(), nd6_timer(), and nd6_dad_start()?

The stack trace goes more or less like this:

db_trace_self_wrapper()
vpanic()
panic()
trap_fatal()
trap()
calltrap()
nd6_dad_start()
nd6_timer()
softclock_call_cc()
softclock()
ithread_loop()
fork_exit()
fork_trampoline()

This was last seen while transitioning from r345628 to r346220 on 
amd64 stable/12.

-- 
Trond.