freebsd stable - Apr 2019 - Panic during reboot involving softclock_call_cc(), nd6_timer() and nd6_dad_start()

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.

On Mon, 15 Apr 2019 15:31+0200, Trond Endrest?l wrote:
> 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.
The NIC in question is a Chelsio T6225-CR, cxgbe(4), using the cc0 
port only.

-- 
Trond.

On 15.04.2019 16:31, Trond Endrest?l wrote:
> 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.
Hi,

do you have exact panic message and/or backtrace from core dump?
It would be good to submit PR about such problems.

-- 
WBR, Andrey V. Elsukov

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