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 1:33 PM, Mateusz Guzik <mjguzik at gmail.com> wrote:

> On Sun, Feb 18, 2018 at 9:38 PM, Trond Endrestøl <
> Trond.Endrestol at fagskolen.gjovik.no> wrote:
> 
>> On Sun, 18 Feb 2018 11:51-0800, Mark Millard wrote:
>> 
>>> Note: -r329448 was reverted in -r329461 : racy.
>> 
>> True. I got a crash when compiling r329451 while running r329449.
>> I've now booted the r329422 ZFS BE and I'm attempting to build
>> r329529.
>> 
> 
> Looking around strongly suggests r329448 is the culprit. If you can verify
> 329447 works fine we are mostly done here.
> 
> Note the revision got reverted and different variant got in in r329531.
> 
> That said, if r329447 works then the issue should be already fixed and in
> particular fresh head should work fine.

My initial problem was with -r329465, which is after -r329461 reverted
-r329488 . Trond reported in one note that he had problems with
-r329464 , also after -r329488 was reverted. Trond has also reported
-r329449 failed.

I did manage to revert to -r329447 earlier and so far the results
suggests that it works.

From this I get that -r329449 is the the one that is common to
all the so--far failing combinations. -r329448 is not common to
all of them.


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