vmx0: watchdog timeout on queue 2, no interrupts on BSP

[Andriy Gapon]

On 20/07/2019 20:08, Patrick Kelsey wrote:
> 
> 
> On Fri, Jul 19, 2019 at 10:07 AM Andriy Gapon <avg at freebsd.org
> <mailto:avg at freebsd.org>> wrote:
> 
> 
>     Recently we experienced a strange problem.
>     We noticed a lot of these messages in the logs:
>     vmx0: watchdog timeout on queue 2
>     (always queue 2)
>     Also, we noticed that connections to some end points did not work at all
>     while others worked without problems.  I assume that that was because
>     specific flows got assigned to that queue 2.
> 
>     Further investigation has shown that none of interrupts assigned to the
>     BSP has ever fired (since boot, of course).  That included vmx0:rx2 and
>     vmx0:tx2.  But also interrupts for other drivers as well.
> 
>     Trying to get more information I rebooted the system and the problem
>     disappeared.
> 
>     Has anyone seen anything like that?
>     Any thoughts on possible causes?
>     Any suggestions what to check if/when the problem reoccurs?
> 
>     Thanks!
> 
> 
> If you are running head at or after r347221 or stable/12 at or after
> r349112, then this could be due to
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239118 (see Comment 4
> - short story is that an iflib change has broken the vmx driver).

I am not sure if that bug could lead to all interrupts on the core
getting disabled (for all drivers), and right at the boot time.


-- 
Andriy Gapon