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iotests: Test active commit with iothread and background I/O

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This is a better regression test for the bugs hidden by commit 80fc5d26
('graph-lock: Disable locking for now'). With that commit reverted, it
hangs instantaneously and reliably for me.

It is important to have a reliable test like this, because the following
commits will set out to fix the actual root cause of the deadlocks and
then finally revert commit 80fc5d26, which was only a stopgap solution.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20230605085711.21261-2-kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2023-06-05 10:57:01 +02:00
parent 52ed34cbdd
commit 23e6c3c41b
2 changed files with 108 additions and 0 deletions
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85
tests/qemu-iotests/tests/iothreads-commit-active Executable file
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#!/usr/bin/env python3
# group: rw quick auto
#
# Copyright (C) 2023 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Creator/Owner: Kevin Wolf <kwolf@redhat.com>
import asyncio
import iotests
iotests.script_initialize(supported_fmts=['qcow2'],
supported_platforms=['linux'])
iotests.verify_virtio_scsi_pci_or_ccw()
with iotests.FilePath('disk0.img') as img_path, \
iotests.FilePath('disk0-snap.img') as snap_path, \
iotests.FilePath('mirror-src.img') as src_path, \
iotests.FilePath('mirror-dst.img') as dst_path, \
iotests.VM() as vm:
img_size = '10M'
iotests.qemu_img_create('-f', iotests.imgfmt, img_path, img_size)
iotests.qemu_img_create('-f', iotests.imgfmt, '-b', img_path,
'-F', iotests.imgfmt, snap_path)
iotests.qemu_img_create('-f', iotests.imgfmt, src_path, img_size)
iotests.qemu_img_create('-f', iotests.imgfmt, dst_path, img_size)
iotests.qemu_io_log('-c', 'write 0 64k', img_path)
iotests.qemu_io_log('-c', 'write 1M 64k', snap_path)
iotests.qemu_io_log('-c', 'write 3M 64k', snap_path)
iotests.qemu_io_log('-c', f'write 0 {img_size}', src_path)
iotests.log('Launching VM...')
vm.add_object('iothread,id=iothread0')
vm.add_object('throttle-group,x-bps-write=1048576,id=tg0')
vm.add_blockdev(f'file,node-name=disk0-file,filename={img_path}')
vm.add_blockdev('qcow2,node-name=disk0-fmt,file=disk0-file')
vm.add_drive(snap_path, 'backing=disk0-fmt,node-name=disk0',
interface='none')
vm.add_device('virtio-scsi,iothread=iothread0')
vm.add_device('scsi-hd,drive=drive0')
vm.add_blockdev(f'file,filename={src_path},node-name=mirror-src-file')
vm.add_blockdev('qcow2,file=mirror-src-file,node-name=mirror-src')
vm.add_blockdev(f'file,filename={dst_path},node-name=mirror-dst-file')
vm.add_blockdev('qcow2,file=mirror-dst-file,node-name=mirror-dst-fmt')
vm.add_blockdev('throttle,throttle-group=tg0,file=mirror-dst-fmt,'
'node-name=mirror-dst')
vm.add_device('scsi-hd,drive=mirror-src')
vm.launch()
# The background I/O is created on unrelated nodes (so that they won't be
# drained together with the other ones), but on the same iothread
iotests.log('Creating some background I/O...')
iotests.log(vm.qmp('blockdev-mirror', job_id='job0', sync='full',
device='mirror-src', target='mirror-dst',
auto_dismiss=False))
iotests.log('Starting active commit...')
iotests.log(vm.qmp('block-commit', device='disk0', job_id='job1',
auto_dismiss=False))
# Should succeed and not time out
try:
vm.run_job('job1', wait=5.0)
vm.shutdown()
except asyncio.TimeoutError:
# VM may be stuck, kill it
vm.kill()
raise

23
tests/qemu-iotests/tests/iothreads-commit-active.out Normal file
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wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1048576
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 3145728
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 10485760/10485760 bytes at offset 0
10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Launching VM...
Creating some background I/O...
{"return": {}}
Starting active commit...
{"return": {}}
{"execute": "job-complete", "arguments": {"id": "job1"}}
{"return": {}}
{"data": {"device": "job1", "len": 131072, "offset": 131072, "speed": 0, "type": "commit"}, "event": "BLOCK_JOB_READY", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}
{"data": {"device": "job1", "len": 131072, "offset": 131072, "speed": 0, "type": "commit"}, "event": "BLOCK_JOB_COMPLETED", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}
{"execute": "job-dismiss", "arguments": {"id": "job1"}}
{"return": {}}