kselftest: signal all child processes

We have some many cases that will create child process as well, such as
pidfd_wait. Previously, we will signal/kill the parent process when it
is time out, but this signal will not be sent to its child process. In
such case, if child process doesn't terminate itself, ksefltest framework
will hang forever.

Here we group all its child processes so that kill() can signal all of
them in timeout.

Fixed change log: Shuah Khan <skhan@linuxfoundation.org>

Suggested-by: yang xu <xuyang2018.jy@cn.fujitsu.com>
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
index 471eaa7b3a3f20150bcb385eded0c8155d9e05be..11779405dc804d34ef8ac767ec5e22b6d2b5c0ba 100644 (file)
--- a/tools/testing/selftests/kselftest_harness.h
+++ b/tools/testing/selftests/kselftest_harness.h
@@ -877,7 +877,8 @@ static void __timeout_handler(int sig, siginfo_t *info, void *ucontext)
        }
 
        t->timed_out = true;
-       kill(t->pid, SIGKILL);
+       // signal process group
+       kill(-(t->pid), SIGKILL);
 }
 
 void __wait_for_test(struct __test_metadata *t)
@@ -987,6 +988,7 @@ void __run_test(struct __fixture_metadata *f,
                ksft_print_msg("ERROR SPAWNING TEST CHILD\n");
                t->passed = 0;
        } else if (t->pid == 0) {
+               setpgrp();
                t->fn(t, variant);
                if (t->skip)
                        _exit(255);