Re: [Qemu-devel] qemu-system-s390x tests/boot-serial-test intermittent failure

[Christian Borntraeger <borntraeger@de.ibm.com>]

On 03/24/2017 11:57 AM, Peter Maydell wrote:
> Hi; qemu-system-s390x seems to have an intermittent failure at
> the moment -- it's been causing our Travis builds to flap. I actually
> caught it doing this on one of my local test builds (which happens
> to be aarch64 but I don't think that matters, since Travis is doing
> x86 builds):
> 
> while  QTEST_QEMU_BINARY=s390x-softmmu/qemu-system-s390x
> QTEST_QEMU_IMG=qemu-img MALLOC_PERTURB_=${MALLOC_PERTURB_:-$((RANDOM %
> 255 + 1))} gtester -k --verbose -m=quick tests/boot-serial-test ; do
> true; done
>  TEST: tests/boot-serial-test... (pid=1122)
>   /s390x/boot-serial/s390-ccw-virtio:                                  OK
> PASS: tests/boot-serial-test
> TEST: tests/boot-serial-test... (pid=1135)
>   /s390x/boot-serial/s390-ccw-virtio:                                  OK
> [skip lots more successes]
> TEST: tests/boot-serial-test... (pid=1582)
>   /s390x/boot-serial/s390-ccw-virtio:
> Broken pipe
> FAIL
> GTester: last random seed: R02Se94f36f305f2edd8391a22749ec91143
> (pid=1635)
> FAIL: tests/boot-serial-test
> 
> Any ideas?
> thanks

Adding Thomas who did the s390 version.

One idea. Maybe qemu exits before the other side is ready.
Does reverting

commit 864111f422babcf8ce837fb47f7f9e1948446f22
Author:     Christian Borntraeger <borntraeger@de.ibm.com>
AuthorDate: Tue Oct 18 09:29:54 2016 +0200
Commit:     Paolo Bonzini <pbonzini@redhat.com>
CommitDate: Wed Nov 2 09:28:56 2016 +0100

    vl: exit qemu on guest panic if -no-shutdown is not set

help?

If yes, does 
diff --git a/tests/boot-serial-test.c b/tests/boot-serial-test.c
index 57edf6a..11f48b0 100644
--- a/tests/boot-serial-test.c
+++ b/tests/boot-serial-test.c
@@ -79,8 +79,8 @@ static void test_machine(const void *data)
     g_assert(fd != -1);
 
     args = g_strdup_printf("-M %s,accel=tcg -chardev file,id=serial0,path=%s"
-                           " -serial chardev:serial0 %s", test->machine,
-                           tmpname, test->extra);
+                           " -no-shutdown -serial chardev:serial0 %s",
+                           test->machine, tmpname, test->extra);
 
     qtest_start(args);
     unlink(tmpname);

also help?