tst_test: Be more verbose on timeout
I've recently stumbled upon a test that caused deadlock in the kernel
and the test processes could not be killed because of that. This was
while testing fanotify07 testcase on unpatched kernel.
In that case the test library just slept in the waitpid() call forever without
producing any output. That was since the alarm handler that sends the SIGKILL
to the test processes has fired but the processes stayed alive due to the
kernel bug.
This patch makes this situation more verbose we:
* Print a message that we are about to kill the test process once it has
timeouted so that the user knows that something unexpected is
happening
* We retry 10 times with 5 second delay between tries
* And finally if we are out of retries and if the test processes are
stil alive we congratulate user on hitting a kernel bug and exit
uncleanly with TFAIL
Example test output:
$ ./fanotify07
tst_test.c:862: INFO: Timeout per run is 0h 05m 00s
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Cannot kill test processes!
Congratulation, likely test hit a kernel bug.
Exitting uncleanly...
$ echo $?
1
Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
Acked-by: Jan Stancek <jstancek@redhat.com>
1 file changed