amd64 head -r329465 (non-debug build, but with symbols): "panic: spin lock held too long" during make check-old, reported during a sys_vfork

[Mark Millard]

On 2018-Feb-18, at 11:30 AM, Trond Endrestøl <Trond.Endrestol at fagskolen.gjovik.no> wrote:

> On Sun, 18 Feb 2018 19:08+0100, Mateusz Guzik wrote:
> 
>> Can you please bisect this? There is another report stating that r329418
>> works fine.
> 
> My problems started yesterday with r329464. I decided to go back to 
> r329101 (ZFS BE), update the source tree, move forward to the latest 
> revision, and so on. I even emptied /usr/obj and /var/cache/ccache and 
> set WITHOUT_SYSTEM_COMPILER=yes in /etc/src.conf to get rid of any 
> bias.
> 
> I have tried with success r329418, r329419, r329420, and r329422.
> 
> I'm now at r329448 and have not seen any spin lock problems so far.

Note: -r329448 was reverted in -r329461 : racy.

> Sooner or later I'll reach r329464 and by then it should be clear 
> which revision is the likely culprit.

===
Mark Millard
marklmi at yahoo.com
( markmi at dsl-only.net is
going away in 2018-Feb, late)