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Re: [PATCH] tests/migration: Print some debug on bad status


From: Jens Freimann
Subject: Re: [PATCH] tests/migration: Print some debug on bad status
Date: Mon, 11 Nov 2019 11:15:54 +0100
User-agent: NeoMutt/20180716-1376-5d6ed1

On Fri, Nov 08, 2019 at 06:38:17PM +0000, Dr. David Alan Gilbert wrote:
Hi Jens,
 the unplug failover stuff is triggering an assertion occasionally on
aarch64; but
 a) I'm not sure the right way to fix it
 b) And I'm out for a little over a week

so...

I'll take care of it.

* address@hidden (address@hidden) wrote:
Patchew URL: https://patchew.org/QEMU/address@hidden/



Hi,

This series failed the docker-quick@centos7 build test. Please find the testing 
commands and
their output below. If you have Docker installed, you can probably reproduce it
locally.

=== TEST SCRIPT BEGIN ===
#!/bin/bash
make docker-image-centos7 V=1 NETWORK=1
time make docker-test-quick@centos7 SHOW_ENV=1 J=14 NETWORK=1
=== TEST SCRIPT END ===

  TEST    check-unit: tests/test-bdrv-drain
wait_for_migration_fail: unexpected status status=wait-unplug allow_active=1

In tests/migration-test.c we've got wait_for_migration_fail, and it's
expecting the state to be any one of:
  setup, failed or maybe active

but it's getting surprised by seeing a 'wait-unplug'

So the question is should we see a wait-unplug?

the migration code has:

   if (qemu_savevm_nr_failover_devices()) {
       migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
                         MIGRATION_STATUS_WAIT_UNPLUG);

Should qemu_savevm_nr_failover_devices() be true?
On aarch64 it seems to have a virtio-net device by default
and qemu_savevm_nr_failover_devices() checks for devices
having dev_unplug_pending but doesn't call it.

I see two fixes but am not sure which is right:
  a) Add 'wait-unplug' to the wait_for_migration_fail
     (easy)
  b) Actually call dev_unplug_pending in qemu_savevm_nr_failover_devices
     so that on a guest which has a virtio-net, but no failover device,
     the state isn't entered.

I also prefer b over a, but I should only set up dev_unplug_pending when
failover=on to avoid this. I'll send a patch.

regards
Jens




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