iotest 203 relatively often fails for me, at least when run in parallel.
 When I run the following concurrently on four shells:

$ while TEST_DIR=/tmp/t1 ./check -T -qcow2 203; do; done
$ while TEST_DIR=/tmp/t2 ./check -T -qcow2 203; do; done
$ while TEST_DIR=/tmp/t3 ./check -T -qcow2 203; do; done
$ while TEST_DIR=/tmp/t4 ./check -T -qcow2 203; do; done

Very quickly (like under ten iterations), at least one of those starts
to hang and then fails because of a timeout in vm.get_qmp_event().

Before digging deeper into the ppoll() dungeon* myself, I decided to
report this so I wouldn't have to. :-)


(gdb) bt
#0  0x00007f354137b4d6 in ppoll () at /lib64/libc.so.6
#1  0x000055b659144299 in ppoll (__ss=0x0, __timeout=0x7ffe4eaca230,
__nfds=<optimized out>, __fds=<optimized out>) at
#2  0x000055b659144299 in qemu_poll_ns (fds=<optimized out>,
nfds=<optimized out>, timeout=timeout@entry=39512999619000) at
#3  0x000055b6591450a3 in os_host_main_loop_wait (timeout=<optimized
out>) at util/main-loop.c:255
#4  0x000055b6591450a3 in main_loop_wait (nonblocking=<optimized out>)
at util/main-loop.c:515
#5  0x000055b658d4a253 in main_loop () at vl.c:1933
#6  0x000055b658d4a253 in main (argc=<optimized out>, argv=<optimized
out>, envp=<optimized out>) at vl.c:4757


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