[Bug 200319] Bridge+CARP crashes/freezes

[Nikos Vassiliadis]

On 07/21/15 05:37, Jason Unovitch wrote:
> On 07/20/2015 08:26, Nikos Vassiliadis wrote:
>> Hi,
>>
>> regarding this bug... When carp information is about to be printed,
>> it stops. All network activity has stopped by then. For example:
>>
>>> bridge0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST>
>>> metric 0 mtu 1280
>>>         ether 02:48:9e:59:98:00
>>>         inet 156.0.0.2 netmask 0xffffffc0 broadcast 156.0.0.63
>>>         inet 156.0.0.10 netmask 0xffffffc0 broadcast 156.0.0.63 vhid 10
>>>         nd6 options=9<PERFORMNUD,IFDISABLED>
>>> load: 1.18  cmd: ifconfig 1683 [running] 4.14r 0.00u 0.01s 35% 2268k
>>> load: 1.18  cmd: ifconfig 1683 [running] 4.59r 0.00u 0.01s 36% 2268k
>>> load: 1.18  cmd: ifconfig 1683 [running] 4.85r 0.00u 0.01s 39% 2268k
>>> load: 1.18  cmd: ifconfig 1683 [running] 5.05r 0.00u 0.01s 41% 2268k
>>> load: 1.18  cmd: ifconfig 1683 [running] 5.27r 0.00u 0.01s 39% 2268k
>>> load: 1.18  cmd: ifconfig 1683 [running] 5.48r 0.00u 0.01s 41% 2268k
>>> load: 1.18  cmd: ifconfig 1683 [running] 5.69r 0.00u 0.01s 43% 2268k
>>> ^C^C^C^Z
>>>
>>>
>>>
>>>
>>>
>>> load: 1.86  cmd: ifconfig 1683 [*carp_if] 31.26r 0.00u 30.67s 88% 2268k
>>> load: 1.86  cmd: ifconfig 1683 [*carp_if] 31.42r 0.00u 30.67s 88% 2268k
>>> ^Z^Z^Z^C^C^C^C
>>>
>>> load: 0.22  cmd: ifconfig 1683 [*carp_if] 645.27r 0.00u 30.67s 0% 2268k
>>> load: 0.21  cmd: ifconfig 1683 [*carp_if] 645.81r 0.00u 30.67s 0% 2268k
>>> load: 0.21  cmd: ifconfig 1683 [*carp_if] 646.17r 0.00u 30.67s 0% 2268k
>>
>>
>> Eventually the kernel will panic:
>>> panic: deadlkres: possible deadlock detected for 0xfffff800045b44a0,
>>> blocked for 900246 ticks
>>
>>
>> Is this the same bug, Jason?
>>
>> I could try the patch on my bhyve cluster.
>>
>> Thanks,
>> Nikos
>
> Nikos,
> The report at https://bugs.FreeBSD.org/200319 and associated pfSense
> report at https://redmine.pfSense.org/issues/4607 indicate that network
> traffic sent to the CARP IP is causing the issue.  I don't see anything
> that mentions printing the information.
>
> However with that said, I'm not familiar with the issue as I've never
> used CARP.  I'm just doing my due diligence passing on a report that the
> patch resolved another user's issue over in the FreeBSD Forums:
> https://forums.FreeBSD.org/threads/carp-bridge-crashes-freezes-on-freebsd-10.52427
>
>
> Hope that helps.
> Jason


Yes, it helps. Unfortunately the patch does not apply cleanly to
10-STABLE. If I manage to use it, I 'll post it here.

Nikos