From 71a268a5fd437e5beae0c931e5bb8afbfe7f3e53 Mon Sep 17 00:00:00 2001 From: Eric Blake Date: Fri, 10 Aug 2018 08:28:00 -0500 Subject: tests/libqtest: Improve kill_qemu() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit In kill_qemu() we have an assert that checks that the QEMU process didn't dump core: assert(!WCOREDUMP(wstatus)); Unfortunately the WCOREDUMP macro here means the resulting message is not very easy to comprehend on at least some systems: ahci-test: tests/libqtest.c:113: kill_qemu: Assertion `!(((__extension__ (((union { __typeof(wstatus) __in; int __i; }) { .__in = (wstatus) }).__i))) & 0x80)' failed. and it doesn't identify what signal the process took. What's more, WCOREDUMP is not reliable - in some cases, setrlimit() coupled with kernel dump settings can result in the flag not being set. It's better to log ALL death by signal, instead of caring whether a core dump was attempted (although once we know a signal happened, also mentioning if a core dump is present can be helpful). Furthermore, we are NOT detecting EINTR (while EINTR shouldn't be happening if we didn't install signal handlers, it's still better to always be robust). Finally, even non-signal death with a non-zero status is suspicious, since qemu's SIGINT handler is supposed to result in exit(0). Instead of using a raw assert, print the information in an easier to understand way: /i386/ahci/sanity: tests/libqtest.c:129: kill_qemu() detected QEMU death from signal 11 (Segmentation fault) (core dumped) (Of course, the really useful information would be why the QEMU process dumped core in the first place, but we don't have that by the time the test program has picked up the exit status.) Suggested-by: Peter Maydell Signed-off-by: Eric Blake Message-Id: <20180810132800.38549-1-eblake@redhat.com> Reviewed-by: Markus Armbruster [Core dump reporting and commit message tweaked] Signed-off-by: Markus Armbruster Reviewed-by: Philippe Mathieu-Daudé --- tests/libqtest.c | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) diff --git a/tests/libqtest.c b/tests/libqtest.c index 3706f30aa2..b703fca26d 100644 --- a/tests/libqtest.c +++ b/tests/libqtest.c @@ -107,10 +107,28 @@ static void kill_qemu(QTestState *s) pid_t pid; kill(s->qemu_pid, SIGTERM); - pid = waitpid(s->qemu_pid, &wstatus, 0); + TFR(pid = waitpid(s->qemu_pid, &wstatus, 0)); - if (pid == s->qemu_pid && WIFSIGNALED(wstatus)) { - assert(!WCOREDUMP(wstatus)); + assert(pid == s->qemu_pid); + /* + * We expect qemu to exit with status 0; anything else is + * fishy and should be logged with as much detail as possible. + */ + if (wstatus) { + if (WIFEXITED(wstatus)) { + fprintf(stderr, "%s:%d: kill_qemu() tried to terminate QEMU " + "process but encountered exit status %d\n", + __FILE__, __LINE__, WEXITSTATUS(wstatus)); + } else if (WIFSIGNALED(wstatus)) { + int sig = WTERMSIG(wstatus); + const char *signame = strsignal(sig) ?: "unknown ???"; + const char *dump = WCOREDUMP(wstatus) ? " (core dumped)" : ""; + + fprintf(stderr, "%s:%d: kill_qemu() detected QEMU death " + "from signal %d (%s)%s\n", + __FILE__, __LINE__, sig, signame, dump); + } + abort(); } } } -- cgit v1.2.3