Re: [Qemu-devel] [PULL 00/38] QAPI patches for 2018-03-12, 2.12 softfreeze

[Peter Xu]

On Mon, Mar 19, 2018 at 10:27:41AM -0500, Eric Blake wrote:
> On 03/19/2018 09:57 AM, Eric Blake wrote:
> > On 03/19/2018 04:26 AM, Peter Xu wrote:
> > 
> > > > > for you to fetch changes up to
> > > > > 75eb57e3ed3682f011a6694863044e8b143a9821:
> > > > > 
> > > > >    qapi: Pass '-u' when doing non-silent diff (2018-03-16
> > > > > 09:00:07 -0500)
> > > > > 
> > 
> > > > Hi. I get a bunch of test assertion failures with this:
> > > > 
> 
> > 
> > I haven't been able to reproduce the testsuite failures on my Linux box,
> > but if it's a race, then that doesn't make me all the more confident on
> > what it takes to reproduce and/or fix the race.
> 
> Okay, my simple builds on just x86_64-softmmu weren't hitting it, but my
> 'build all binaries' tree seems to be hitting the same thing:
> 
>   GTESTER check-qtest-ppcemb
> qemu-system-ppcemb: chardev/char-io.c:91: io_watch_poll_finalize: Assertion
> `iwp->src == NULL' failed.
> Broken pipe
> GTester: last random seed: R02S74d45e64b38428eddd131a5c1b4c878c
> make: *** [/home/eblake/qemu-tmp/tests/Makefile.include:878:
> check-qtest-ppcemb] Error 1
> 
> so I'm now testing if your squash makes a difference, now that it looks like
> I'm reproducing the problem.

Exactly what I encountered.  My old tests on v8 are not strong enough
(less binaries, less concurrency).  I reproduced that easily when I
didn't specify --target-list (so all binaries), then run tests with
more concurrency (-j8).

However still I never reproduced the QIO problem even with that.  I
suspect that's a more hard-to-trigger race, and even it might not
related to OOB (but I'm not sure).

-- 
Peter Xu