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

On 2018-Feb-18, at 1:46 PM, Mark Millard <marklmi26-fbsd_at_yahoo.com> wrote:

> 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.

Dumb typos above: I meant -r329448 instead of -r329488 both times.

> 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)