Re: [Qemu-devel] [PULL 2/7] tests/migration: Enable the migration test on s390x, too

[Thomas Huth]

On 2018-10-17 21:28, Emilio G. Cota wrote:
> On Thu, Oct 11, 2018 at 20:25:08 +0100, Dr. David Alan Gilbert (git) wrote:
>> From: Thomas Huth <address@hidden>
>>
>> We can re-use the s390-ccw bios code to implement a small firmware
>> for a s390x guest which prints out the "A" and "B" characters and
>> modifies the memory, as required for the migration test.
>>
>> [quintela: Converted the compile script to Makefile rules]
>> Signed-off-by: Juan Quintela <address@hidden>
>> Signed-off-by: Thomas Huth <address@hidden>
>> Message-Id: <address@hidden>
>> Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
>> Tested-by: Philippe Mathieu-Daudé <address@hidden>
>> Signed-off-by: Dr. David Alan Gilbert <address@hidden>
>>   Fixed up Makefile since the aarch patch sneaked in first
> 
> I suspect this test is giving me intermittent hangs. I've seen the hangs
> in different machines, but when they're lightly loaded the
> hang happens more frequently.
> 
> To reproduce:
> 
> $ ./configure --target-list=s390x-softmmu
> $ make clean && make
> $ for i in $(seq 0 150); do echo $i && make -j check-qtest || break; done
> 
> It usually ends up hanging before 50 runs. When the hang happens, I see
> two qemu-system-s390x processes with:
> 
> -serial file:/tmp/migration-test-0FZErQ/dest_serial
> 
> as an argument, among others. That means the migration test is the
> one hanging, correct?

Can you also reproduce it directly by only running the migration test
alone, just to be sure? I.e. run something like this in a loop:

QTEST_QEMU_BINARY="s390x-softmmu/qemu-system-s390x" tests/migration-test

 Thanks,
  Thomas