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

[Mateusz Guzik]

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.

-- 
Mateusz Guzik <mjguzik gmail.com>