[Bug 244247] Kernel panic due to racecondition in ng_eiface shutdown

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244247

--- Comment #11 from Vladislav V. Prodan <admin at support.od.ua> ---

I applied the patch and rebuilt the kernel.

Kernel panic is no longer there, but in the logs /var/log/messages messages of
the form:

...
Feb 26 21:43:17 core kernel: ngeth504: link state changed to DOWN
Feb 26 21:43:17 core dhclient[3168]: receive_packet failed on ngeth504: Device
not configured
Feb 26 21:43:17 core dhclient[3168]: ioctl(SIOCGIFFLAGS) on ngeth504: Operation
not permitted
Feb 26 21:43:17 core kernel: if_delmulti_locked: detaching ifnet instance
0xfffff80059e8b000
Feb 26 21:43:17 core syslogd: last message repeated 1 times
Feb 26 21:43:17 core kernel: ifaddr cache = 0xfffff8000ddf5600 is deleted
Feb 26 21:43:17 core kernel: if_delmulti_locked: detaching ifnet instance
0xfffff80059e8b000
Feb 26 21:43:17 core syslogd: last message repeated 3 times
Feb 26 21:43:17 core dhclient[3168]: Interface ngeth504 no longer appears
valid.
Feb 26 21:43:17 core dhclient[3168]: No live interfaces to poll on - exiting.
Feb 26 21:43:17 core dhclient[3168]: exiting.
Feb 26 21:43:17 core dhclient[3168]: connection closed
Feb 26 21:43:17 core dhclient[3168]: exiting.
Feb 26 21:43:17 core root[3259]: /etc/rc.d/dhclient: WARNING: failed to start
dhclient
...

Feb 26 21:46:11 core kernel: ngeth0: link state changed to DOWN
Feb 26 21:46:11 core dhclient[3521]: receive_packet failed on ngeth0: Device
not configured
Feb 26 21:46:11 core dhclient[3521]: ioctl(SIOCGIFFLAGS) on ngeth0: Operation
not permitted
Feb 26 21:46:11 core dhclient[3521]: Interface ngeth0 no longer appears valid.
Feb 26 21:46:11 core dhclient[3521]: No live interfaces to poll on - exiting.
Feb 26 21:46:11 core dhclient[3521]: exiting.
Feb 26 21:46:11 core dhclient[3521]: connection closed
Feb 26 21:46:11 core dhclient[3521]: exiting.
Feb 26 21:46:11 core root[10207]: /etc/rc.d/dhclient: WARNING: failed to start
dhclient
Feb 26 21:46:11 core kernel: if_delmulti_locked: detaching ifnet instance
0xfffff80059e8e000
Feb 26 21:46:11 core kernel: ifaddr cache = 0xfffff80059db2800 is deleted
Feb 26 21:46:11 core kernel: if_delmulti_locked: detaching ifnet instance
0xfffff80059e8e000
Feb 26 21:46:11 core syslogd: last message repeated 4 times
...

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