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[Qemu-block] [PATCH] iotests: Wait for qemu to end in 223

From: Eric Blake
Subject: [Qemu-block] [PATCH] iotests: Wait for qemu to end in 223
Date: Tue, 5 Mar 2019 12:29:08 -0600

When iotest 223 was first written, it didn't matter if we waited for
the qemu process to clean up. But with the introduction of a later
qemu-nbd process trying to reuse the same file, there is a race where
even though the asynchronous qemu process has responded to "quit", it
has not yet had time to unlock the file and exit, resulting in:

-[{ "start": 0, "length": 65536, "depth": 0, "zero": false, "data": false},
-{ "start": 65536, "length": 2031616, "depth": 0, "zero": false, "data": true},
-{ "start": 2097152, "length": 2097152, "depth": 0, "zero": false, "data": 
+qemu-nbd: Failed to blk_new_open 'tests/qemu-iotests/scratch/t.qcow2': Failed 
to get shared "write" lock
+Is another process using the image [tests/qemu-iotests/scratch/t.qcow2]?
+qemu-img: Could not open 
 Failed to connect socket tests/qemu-iotests/scratch/qemu-nbd.sock: Connection 
+./common.nbd: line 33: kill: (11122) - No such process

Fixes: ddd09448
Reported-by: Alberto Garcia <address@hidden>
Signed-off-by: Eric Blake <address@hidden>
 tests/qemu-iotests/223     | 1 +
 tests/qemu-iotests/223.out | 1 +
 2 files changed, 2 insertions(+)

diff --git a/tests/qemu-iotests/223 b/tests/qemu-iotests/223
index f120a016460..c0a4f9c14b7 100755
--- a/tests/qemu-iotests/223
+++ b/tests/qemu-iotests/223
@@ -179,6 +179,7 @@ _send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-remove",
 _send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-stop"}' "return"
 _send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-stop"}' "error" # Again
 _send_qemu_cmd $QEMU_HANDLE '{"execute":"quit"}' "return"
+wait=yes _cleanup_qemu

 echo "=== Use qemu-nbd as server ==="
diff --git a/tests/qemu-iotests/223.out b/tests/qemu-iotests/223.out
index 6476b77ba20..95c40a17ad7 100644
--- a/tests/qemu-iotests/223.out
+++ b/tests/qemu-iotests/223.out
@@ -89,6 +89,7 @@ read 2097152/2097152 bytes at offset 2097152
 {"return": {}}
 {"error": {"class": "GenericError", "desc": "NBD server not running"}}
 {"return": {}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}

 === Use qemu-nbd as server ===


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