[Virtio-fs] Regression save/restore of vsock: (was [PULL 07/55] hw/virtio: move vm_running check to virtio_device_started)
Alex Bennée
alex.bennee at linaro.org
Fri Oct 14 08:37:00 UTC 2022
Christian Borntraeger <borntraeger at linux.ibm.com> writes:
> Am 10.10.22 um 19:29 schrieb Michael S. Tsirkin:
>> From: Alex Bennée <alex.bennee at linaro.org>
>> All the boilerplate virtio code does the same thing (or should at
>> least) of checking to see if the VM is running before attempting to
>> start VirtIO. Push the logic up to the common function to avoid
>> getting a copy and paste wrong.
>> Signed-off-by: Alex Bennée <alex.bennee at linaro.org>
>> Message-Id: <20220802095010.3330793-11-alex.bennee at linaro.org>
>> Reviewed-by: Michael S. Tsirkin <mst at redhat.com>
>> Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
>
> This results in a regression for our s390x CI when doing save/restore of guests with vsock:
>
>
> #1 0x000003ff9a248580 raise (libc.so.6 + 0x48580)
> #2 0x000003ff9a22b5c0 abort (libc.so.6 + 0x2b5c0)
> #3 0x000003ff9a2409da __assert_fail_base (libc.so.6 + 0x409da)
> #4 0x000003ff9a240a4e __assert_fail (libc.so.6 + 0x40a4e)
> #5 0x000002aa2d69a066 vhost_vsock_common_pre_save (qemu-system-s390x + 0x39a066)
> #6 0x000002aa2d55570e vmstate_save_state_v (qemu-system-s390x + 0x25570e)
> #7 0x000002aa2d556218 vmstate_save_state (qemu-system-s390x + 0x256218)
> #8 0x000002aa2d570ba4
> qemu_savevm_state_complete_precopy_non_iterable (qemu-system-s390x +
> 0x270ba4)
> #9 0x000002aa2d5710b6 qemu_savevm_state_complete_precopy (qemu-system-s390x + 0x2710b6)
> #10 0x000002aa2d564d0e migration_completion (qemu-system-s390x + 0x264d0e)
> #11 0x000002aa2d8db25c qemu_thread_start (qemu-system-s390x + 0x5db25c)
> #12 0x000003ff9a296248 start_thread (libc.so.6 + 0x96248)
> #13 0x000003ff9a31183e thread_start (libc.so.6 + 0x11183e)
Which test does this break?
Looking at the change the only thing I can think of is there is a subtle
change in the order of checks because if the device is set as
use_started we return the result regardless of vm or config state:
if (vdev->use_started) {
return vdev->started;
}
Could some printfs confirm that?
--
Alex Bennée
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