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Re: [Qemu-devel] [PULL 2/7] tests/migration: Enable the migration test o

From: Emilio G. Cota
Subject: Re: [Qemu-devel] [PULL 2/7] tests/migration: Enable the migration test on s390x, too
Date: Wed, 17 Oct 2018 15:28:26 -0400
User-agent: Mutt/1.9.4 (2018-02-28)

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?

Attaching with gdb just shows the TCG thread waiting for work
in qemu_tcg_rr_wait_io_event.

Can anyone reproduce this? Otherwise, let me know what other info
I could provide.



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