Re: various iotests failures apparently due to overly optimistic timeout

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Re: various iotests failures apparently due to overly optimistic timeout

From:	Kevin Wolf
Subject:	Re: various iotests failures apparently due to overly optimistic timeout settings
Date:	Mon, 20 Jul 2020 12:46:41 +0200
Am 19.07.2020 um 14:07 hat Peter Maydell geschrieben:
> I just had a bunch of iotests fail on a freebsd VM test run.
> I think the machine the VM runs on is sometimes a bit heavily
> loaded for I/O, which means the VM can run slowly. This causes
> various over-optimistic timeouts in the iotest testsuite to
> spuriously fail. I also saw the 030 failure on the netbsd VM.
> 
> Can we try to avoid timing-sensitive tests where we can,
> and make timeouts longer than 3 seconds where we can't, please?
> This kind of intermittent failure makes my mergetests flaky.

John, I think this is a result of your recent python/qemu/ changes that
make failure of graceful shutdown an error rather than just silently
falling back to SIGKILL.

Should the default timeout be longer, should iotests override the
default, or should iotests just always kill their VM instead of trying
to shut it down gracefully?

Kevin

> Relevant bits of the log below, there are several different
> flavours of failure.
> 
> 
>   TEST    iotest-qcow2: 030 [fail]
> QEMU          --
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../aarch64-softmmu/qemu-system-aarch64"
> -nodefaults -display none -machine virt -accel qtest
> QEMU_IMG      --
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../qemu-img"
> QEMU_IO       --
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../qemu-io"
> --cache writeback --aio threads -f qcow2
> QEMU_NBD      --
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../qemu-nbd"
> IMGFMT        -- qcow2 (compat=1.1)
> IMGPROTO      -- file
> PLATFORM      -- FreeBSD/amd64 freebsd 12.1-RELEASE
> TEST_DIR      -- /home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/scratch
> SOCK_DIR      -- /tmp/tmp.JFidXl5N
> SOCKET_SCM_HELPER --
> 
> --- /home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/030.out
> 2020-07-19 09:29:05.000000000 +0000
> +++ /home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/030.out.bad
>  2020-07-19 09:52:04.256005000 +0000
> @@ -1,5 +1,57 @@
> -...........................
> +WARNING:qemu.machine:qemu received signal 9; command:
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../aarch64-softmmu/qemu-system-aarch64
> -display none -vga none -chardev
> socket,id=mon,path=/tmp/tmp.JFidXl5N/qemu-24906-monitor.sock -mon
> chardev=mon,mode=control -qtest
> unix:path=/tmp/tmp.JFidXl5N/qemu-24906-qtest.sock -accel qtest
> -nodefaults -display none -machine virt -accel qtest -drive
> if=virtio,id=drive0,file=blkdebug::/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/scratch/test.img,format=qcow2,cache=writeback,aio=threads"
> +WARNING:qemu.machine:qemu received signal 9; command:
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../aarch64-softmmu/qemu-system-aarch64
> -display none -vga none -chardev
> socket,id=mon,path=/tmp/tmp.JFidXl5N/qemu-24906-monitor.sock -mon
> chardev=mon,mode=control -qtest
> unix:path=/tmp/tmp.JFidXl5N/qemu-24906-qtest.sock -accel qtest
> -nodefaults -display none -machine virt -accel qtest -drive
> if=virtio,id=drive0,file=blkdebug::/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/scratch/test.img,format=qcow2,cache=writeback,aio=threads,backing.node-name=mid,backing.backing.node-name=base"
> +...............E......E....
> +======================================================================
> +ERROR: test_set_speed (__main__.TestSetSpeed)
>  ----------------------------------------------------------------------
> +Traceback (most recent call last):
> +  File 
> "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/../../python/qemu/machine.py",
> line 436, in _do_shutdown
> +    self._soft_shutdown(has_quit, timeout)
> +  File 
> "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/../../python/qemu/machine.py",
> line 419, in _soft_shutdown
> +    self._popen.wait(timeout=timeout)
> +  File "/usr/local/lib/python3.7/subprocess.py", line 1019, in wait
> +    return self._wait(timeout=timeout)
> +  File "/usr/local/lib/python3.7/subprocess.py", line 1645, in _wait
> +    raise TimeoutExpired(self.args, timeout)
> +subprocess.TimeoutExpired: Command
> '['/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../aarch64-softmmu/qemu-system-aarch64',
> '-display', 'none', '-vga', 'none', '-chardev',
> 'socket,id=mon,path=/tmp/tmp.JFidXl5N/qemu-24906-monitor.sock',
> '-mon', 'chardev=mon,mode=control', '-qtest',
> 'unix:path=/tmp/tmp.JFidXl5N/qemu-24906-qtest.sock', '-accel',
> 'qtest', '-nodefaults', '-display', 'none', '-machine', 'virt',
> '-accel', 'qtest', '-drive',
> 'if=virtio,id=drive0,file=blkdebug::/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/scratch/test.img,format=qcow2,cache=writeback,aio=threads']'
> timed out after 3 seconds
> +
> +The above exception was the direct cause of the following exception:
> +
> +Traceback (most recent call last):
> +  File "030", line 900, in tearDown
> +    self.vm.shutdown()
> +  File 
> "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/../../python/qemu/machine.py",
> line 466, in shutdown
> +    self._do_shutdown(has_quit, timeout=timeout)
> +  File 
> "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/../../python/qemu/machine.py",
> line 440, in _do_shutdown
> +    from exc
> +qemu.machine.AbnormalShutdown: Could not perform graceful shutdown
> +
> +======================================================================
> +ERROR: test_stream_no_op (__main__.TestSingleDrive)
> +----------------------------------------------------------------------
> +Traceback (most recent call last):
> +  File 
> "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/../../python/qemu/machine.py",
> line 436, in _do_shutdown
> +    self._soft_shutdown(has_quit, timeout)
> +  File 
> "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/../../python/qemu/machine.py",
> line 419, in _soft_shutdown
> +    self._popen.wait(timeout=timeout)
> +  File "/usr/local/lib/python3.7/subprocess.py", line 1019, in wait
> +    return self._wait(timeout=timeout)
> +  File "/usr/local/lib/python3.7/subprocess.py", line 1645, in _wait
> +    raise TimeoutExpired(self.args, timeout)
> +subprocess.TimeoutExpired: Command
> '['/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../aarch64-softmmu/qemu-system-aarch64',
> '-display', 'none', '-vga', 'none', '-chardev',
> 'socket,id=mon,path=/tmp/tmp.JFidXl5N/qemu-24906-monitor.sock',
> '-mon', 'chardev=mon,mode=control', '-qtest',
> 'unix:path=/tmp/tmp.JFidXl5N/qemu-24906-qtest.sock', '-accel',
> 'qtest', '-nodefaults', '-display', 'none', '-machine', 'virt',
> '-accel', 'qtest', '-drive',
> 'if=virtio,id=drive0,file=blkdebug::/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/scratch/test.img,format=qcow2,cache=writeback,aio=threads,backing.node-name=mid,backing.backing.node-name=base']'
> timed out after 3 seconds
> +
> +The above exception was the direct cause of the following exception:
> +
> +Traceback (most recent call last):
> +  File "030", line 131, in test_stream_no_op
> +    self.vm.shutdown()
> +  File 
> "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/../../python/qemu/machine.py",
> line 466, in shutdown
> +    self._do_shutdown(has_quit, timeout=timeout)
> +  File 
> "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/../../python/qemu/machine.py",
> line 440, in _do_shutdown
> +    from exc
> +qemu.machine.AbnormalShutdown: Could not perform graceful shutdown
> +
> +----------------------------------------------------------------------
>  Ran 27 tests
> 
> -OK
> +FAILED (errors=2)
>   TEST    iotest-qcow2: 031
>   TEST    iotest-qcow2: 032
>   TEST    iotest-qcow2: 033
>   TEST    iotest-qcow2: 034 [not run]
>   TEST    iotest-qcow2: 035
>   TEST    iotest-qcow2: 036
>   TEST    iotest-qcow2: 037
>   TEST    iotest-qcow2: 038 [not run]
>   TEST    iotest-qcow2: 039 [not run]
>   TEST    iotest-qcow2: 040 [fail]
> QEMU          --
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../aarch64-softmmu/qemu-system-aarch64"
> -nodefaults -display none -machine virt -accel qtest
> QEMU_IMG      --
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../qemu-img"
> QEMU_IO       --
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../qemu-io"
> --cache writeback --aio threads -f qcow2
> QEMU_NBD      --
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../qemu-nbd"
> IMGFMT        -- qcow2 (compat=1.1)
> IMGPROTO      -- file
> PLATFORM      -- FreeBSD/amd64 freebsd 12.1-RELEASE
> TEST_DIR      -- /home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/scratch
> SOCK_DIR      -- /tmp/tmp.JFidXl5N
> SOCKET_SCM_HELPER --
> 
> --- /home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/040.out
> 2020-07-19 09:29:05.000000000 +0000
> +++ /home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/040.out.bad
>  2020-07-19 09:55:10.837942000 +0000
> @@ -1,5 +1,31 @@
> -...........................................................
> +WARNING:qemu.machine:qemu received signal 9; command:
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../aarch64-softmmu/qemu-system-aarch64
> -display none -vga none -chardev
> socket,id=mon,path=/tmp/tmp.JFidXl5N/qemu-27241-monitor.sock -mon
> chardev=mon,mode=control -qtest
> unix:path=/tmp/tmp.JFidXl5N/qemu-27241-qtest.sock -accel qtest
> -nodefaults -display none -machine virt -accel qtest"
> +...........................E...............................
> +======================================================================
> +ERROR: testIntermediateReadErrorStop (__main__.TestErrorHandling)
>  ----------------------------------------------------------------------
> +Traceback (most recent call last):
> +  File 
> "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/../../python/qemu/machine.py",
> line 436, in _do_shutdown
> +    self._soft_shutdown(has_quit, timeout)
> +  File 
> "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/../../python/qemu/machine.py",
> line 419, in _soft_shutdown
> +    self._popen.wait(timeout=timeout)
> +  File "/usr/local/lib/python3.7/subprocess.py", line 1019, in wait
> +    return self._wait(timeout=timeout)
> +  File "/usr/local/lib/python3.7/subprocess.py", line 1645, in _wait
> +    raise TimeoutExpired(self.args, timeout)
> +subprocess.TimeoutExpired: Command
> '['/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../aarch64-softmmu/qemu-system-aarch64',
> '-display', 'none', '-vga', 'none', '-chardev',
> 'socket,id=mon,path=/tmp/tmp.JFidXl5N/qemu-27241-monitor.sock',
> '-mon', 'chardev=mon,mode=control', '-qtest',
> 'unix:path=/tmp/tmp.JFidXl5N/qemu-27241-qtest.sock', '-accel',
> 'qtest', '-nodefaults', '-display', 'none', '-machine', 'virt',
> '-accel', 'qtest']' timed out after 3 seconds
> +
> +The above exception was the direct cause of the following exception:
> +
> +Traceback (most recent call last):
> +  File "040", line 687, in testIntermediateReadErrorStop
> +    self.vm.shutdown()
> +  File 
> "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/../../python/qemu/machine.py",
> line 466, in shutdown
> +    self._do_shutdown(has_quit, timeout=timeout)
> +  File 
> "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/../../python/qemu/machine.py",
> line 440, in _do_shutdown
> +    from exc
> +qemu.machine.AbnormalShutdown: Could not perform graceful shutdown
> +
> +----------------------------------------------------------------------
>  Ran 59 tests
> 
> -OK
> +FAILED (errors=1)
>   TEST    iotest-qcow2: 041 [fail]
> QEMU          --
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../aarch64-softmmu/qemu-system-aarch64"
> -nodefaults -disp
> lay none -machine virt -accel qtest
> QEMU_IMG      --
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../qemu-img"
> QEMU_IO       --
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../qemu-io"
> --cache writeback --aio threads -f qcow2
> QEMU_NBD      --
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../qemu-nbd"
> IMGFMT        -- qcow2 (compat=1.1)
> IMGPROTO      -- file
> PLATFORM      -- FreeBSD/amd64 freebsd 12.1-RELEASE
> TEST_DIR      -- /home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/scratch
> SOCK_DIR      -- /tmp/tmp.JFidXl5N
> SOCKET_SCM_HELPER --
> 
> --- /home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/041.out
> 2020-07-19 09:29:05.000000000 +0000
> +++ /home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/041.out.bad
>  2020-07-19 10:05:09.812434000 +0000
> @@ -1,5 +1,29 @@
> -........................................................................................................
> +...........................................................................E............................
> +======================================================================
> +ERROR: test_pause (__main__.TestSingleDrive)
>  ----------------------------------------------------------------------
> +Traceback (most recent call last):
> +  File "041", line 109, in test_pause
> +    self.pause_job('drive0')
> +  File "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/iotests.py",
> line 978, in pause_job
> +    return self.pause_wait(job_id)
> +  File "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/iotests.py",
> line 964, in pause_wait
> +    result = self.vm.qmp('query-block-jobs')
> +  File 
> "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/../../python/qemu/machine.py",
> line 511, in qmp
> +    return self._qmp.cmd(cmd, args=qmp_args)
> +  File 
> "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/../../python/qemu/qmp.py",
> line 266, in cmd
> +    return self.cmd_obj(qmp_cmd)
> +  File 
> "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/../../python/qemu/qmp.py",
> line 247, in cmd_obj
> +    resp = self.__json_read()
> +  File 
> "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/../../python/qemu/qmp.py",
> line 137, in __json_read
> +    data = self.__sockfile.readline()
> +  File "/usr/local/lib/python3.7/socket.py", line 589, in readinto
> +    return self._sock.recv_into(b)
> +  File "/usr/home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/iotests.py",
> line 416, in timeout
> +    raise Exception(self.errmsg)
> +Exception: Timeout waiting for job to pause
> +
> +----------------------------------------------------------------------
>  Ran 104 tests
> 
> -OK
> +FAILED (errors=1)
> 
> [...]
>   TEST    iotest-qcow2: 156 [fail]
> QEMU          --
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../aarch64-softmmu/qemu-system-aarch64"
> -nodefaults -disp
> lay none -machine virt -accel qtest
> QEMU_IMG      --
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../qemu-img"
> QEMU_IO       --
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../qemu-io"
> --cache writeback --aio threads -f qcow2
> QEMU_NBD      --
> "/home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/../../qemu-nbd"
> IMGFMT        -- qcow2 (compat=1.1)
> IMGPROTO      -- file
> PLATFORM      -- FreeBSD/amd64 freebsd 12.1-RELEASE
> TEST_DIR      -- /home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/scratch
> SOCK_DIR      -- /tmp/tmp.JFidXl5N
> SOCKET_SCM_HELPER --
> 
> --- /home/qemu/qemu-test.oJwuyW/src/tests/qemu-iotests/156.out
> 2020-07-19 09:29:05.000000000 +0000
> +++ /home/qemu/qemu-test.oJwuyW/build/tests/qemu-iotests/156.out.bad
>  2020-07-19 10:14:48.438647000 +0000
> @@ -19,48 +19,4 @@
>  {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP},
> "event": "JOB_STATUS_CHANGE", "data": {"status": "created", "id":
> "source"}}
>  {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP},
> "event": "JOB_STATUS_CHANGE", "data": {"status": "running", "id":
> "source"}}
>  {"return": {}}
> -{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP},
> "event": "JOB_STATUS_CHANGE", "data": {"status": "ready", "id":
> "source"}}
> -{"timestamp": {fcntl(): Bad file descriptor
> "seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event":
> "BLOCK_JOB_READY", "data": {"device": "source", "len": 131072,
> "offset": 131072, "speed": 0, "type": "mirror"}}
> -{ 'execute': 'human-monitor-command', 'arguments': { 'command-line':
> 'qemu-io source "write -P 4 192k 64k"' } }
> -wrote 65536/65536 bytes at offset 196608
> -64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -{"return": ""}
> -{ 'execute': 'block-job-complete', 'arguments': { 'device': 'source' } }
> -{"return": {}}
> -{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP},
> "event": "JOB_STATUS_CHANGE", "data": {"status": "waiting", "id":
> "source"}}
> -{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP},
> "event": "JOB_STATUS_CHANGE", "data": {"status": "pending", "id":
> "source"}}
> -{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP},
> "event": "BLOCK_JOB_COMPLETED", "data": {"device": "source", "len":
> 196608, "offset": 196608, "speed": 0, "type": "mirror"}}
> -{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP},
> "event": "JOB_STATUS_CHANGE", "data": {"status": "concluded", "id":
> "source"}}
> -{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP},
> "event": "JOB_STATUS_CHANGE", "data": {"status": "null", "id":
> "source"}}
> -
> -{ 'execute': 'human-monitor-command', 'arguments': { 'command-line':
> 'qemu-io source "read -P 1 0k 64k"' } }
> -read 65536/65536 bytes at offset 0
> -64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -{"return": ""}
> -{ 'execute': 'human-monitor-command', 'arguments': { 'command-line':
> 'qemu-io source "read -P 2 64k 64k"' } }
> -read 65536/65536 bytes at offset 65536
> -64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -{"return": ""}
> -{ 'execute': 'human-monitor-command', 'arguments': { 'command-line':
> 'qemu-io source "read -P 3 128k 64k"' } }
> -read 65536/65536 bytes at offset 131072
> -64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -{"return": ""}
> -{ 'execute': 'human-monitor-command', 'arguments': { 'command-line':
> 'qemu-io source "read -P 4 192k 64k"' } }
> -read 65536/65536 bytes at offset 196608
> -64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -{"return": ""}
> -
> -{ 'execute': 'quit' }
> -{"return": {}}
> -{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP},
> "event": "SHUTDOWN", "data": {"guest": false, "reason":
> "host-qmp-quit"}}
> -
> -read 65536/65536 bytes at offset 0
> -64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -read 65536/65536 bytes at offset 65536
> -64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -read 65536/65536 bytes at offset 131072
> -64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -read 65536/65536 bytes at offset 196608
> -64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -
> -*** done
> +Timeout waiting for BLOCK_JOB_READY on handle 0
>   TEST    iotest-qcow2: 158
> 
> 
> thanks
> -- PMM
>
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various iotests failures apparently due to overly optimistic timeout settings, Peter Maydell, 2020/07/19
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  - Re: various iotests failures apparently due to overly optimistic timeout settings, John Snow, 2020/07/20
    - Re: various iotests failures apparently due to overly optimistic timeout settings, Peter Maydell, 2020/07/20
    - Re: various iotests failures apparently due to overly optimistic timeout settings, John Snow, 2020/07/20
    - Re: various iotests failures apparently due to overly optimistic timeout settings, Peter Maydell, 2020/07/20
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