bridge/igb panic: sleepq_add: td 0xfffffe01bbce5300 to sleep on wchan 0xffffffff8157d9a0 with sleeping prohibited

[xtouqh at mm.st]

Hans Petter Selasky wrote:
> On 2020-09-11 14:08, Hans Petter Selasky wrote:
>> I think this is another variant of:
>>
>> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232362
> 
> Also adding this one for the record:
> 
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240609

I see, looks like the problem was masked by some change, and unmasked by 
r365504.  So the workaround is running without INVARIANTS (i.e. 
GENERIC-NODEBUG) for the moment?