migration qtest failure: "query-migrate shows failed migration: Unable to write to socket: Broken pipe"

[Peter Maydell]

Hi; I see this migration qtest failure on my x86 macos box:


▶  32/591 
ERROR:../../tests/qtest/migration-helpers.c:151:migrate_query_not_failed:
assertion fail
ed: (!g_str_equal(status, "failed")) ERROR
 32/591 qemu:qtest+qtest-aarch64 / qtest-aarch64/migration-test
           ERROR          152.27s   killed by signal 6 SIGABRT
――――――――――――――――――――――――――――――――――――― ✀  ―――――――――――――――――――――――――――――――――――――
stderr:
query-migrate shows failed migration: Unable to write to socket: Broken pipe
**
ERROR:../../tests/qtest/migration-helpers.c:151:migrate_query_not_failed:
assertion failed: (!g_str_equal(status, "failed"))
Assertion failed: (pid == s->qemu_pid), function qtest_wait_qemu, file
../../tests/qtest/libqtest.c, line 207.

(test program exited with status code -6)
――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――

and similarly:

▶  34/591 
ERROR:../../tests/qtest/migration-helpers.c:151:migrate_query_not_failed:
assertion failed: (!g_str_equal(status, "failed")) ERROR
 34/591 qemu:qtest+qtest-i386 / qtest-i386/migration-test
           ERROR          169.44s   killed by signal 6 SIGABRT
――――――――――――――――――――――――――――――――――――― ✀  ―――――――――――――――――――――――――――――――――――――
stderr:
query-migrate shows failed migration: Unable to write to socket: Broken pipe
**
ERROR:../../tests/qtest/migration-helpers.c:151:migrate_query_not_failed:
assertion failed: (!g_str_equal(status, "failed"))
Assertion failed: (pid == s->qemu_pid), function qtest_wait_qemu, file
../../tests/qtest/libqtest.c, line 207.

(test program exited with status code -6)
――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――

It seems to be fairly consistent. Any ideas what it might be?
Maybe the QEMU process has already exited before the test binary
gets round to querying the status ?

thanks
-- PMM