[Qemu-devel] qemu iotest 192 does not clean up correctly

[Thomas Huth <thuth@redhat.com>]

I've ran into this failure today:

140 0s ... - output mismatch (see 140.out.bad)
--- /home/thuth/devel/qemu/tests/qemu-iotests/140.out	2019-05-07 17:57:08.000000000 +0200
+++ /home/thuth/tmp/qemu-build/tests/qemu-iotests/140.out.bad	2019-05-08 07:19:23.000000000 +0200
@@ -10,6 +10,8 @@
 {"return": {}}
 qemu-io: can't open device nbd+unix:///drv?socket=TEST_DIR/nbd: Requested export not available
 server reported: export 'drv' not present
+mkfifo: cannot create fifo '/home/thuth/tmp/qemu-build/tests/qemu-iotests/scratch/qmp-out-27628_0': File exists
+mkfifo: cannot create fifo '/home/thuth/tmp/qemu-build/tests/qemu-iotests/scratch/qmp-in-27628_0': File exists
 {"return": {}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
 *** done

... and indeed, there were lots of stale qmp-in-* and qmp-out-*
files in my scratch directory, ultimately causing the above failure
after a couple of days.

After some more testing, it seems like test 192 is not cleaning up
correctly:

$ ls scratch/
$ ./check -qcow2 192
[...]
192 0s ...
Passed all 1 tests
$ ls scratch/
nbd  qemu-0.pid  qmp-in-8772_0  qmp-out-8772_0

Any ideas how to fix this in a clean way (e.g. simply add a
"rm -f scratch/..." at the end of the script) ?

 Thomas