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selftests/powerpc: Kill child processes on SIGINT 

[ Upstream commit 7c27a26e1e ]

There are some powerpc selftests, as tm/tm-unavailable, that run for a long
period (>120 seconds), and if it is interrupted, as pressing CRTL-C
(SIGINT), the foreground process (harness) dies but the child process and
threads continue to execute (with PPID = 1 now) in background.

In this case, you'd think the whole test exited, but there are remaining
threads and processes being executed in background. Sometimes these
zombies processes are doing annoying things, as consuming the whole CPU or
dumping things to STDOUT.

This patch fixes this problem by attaching an empty signal handler to
SIGINT in the harness process. This handler will interrupt (EINTR) the
parent process waitpid() call, letting the code to follow through the
normal flow, which will kill all the processes in the child process group.

This patch also fixes a typo.

Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Gustavo Romero <gromero@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Breno Leitao 2018-08-07 11:15:39 -03:00 committed by Greg Kroah-Hartman
parent c861151b1f
commit e33c8a2896
1 changed files with 12 additions and 6 deletions
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18
tools/testing/selftests/powerpc/harness.c
View File

@ -85,13 +85,13 @@ wait:
return status;
}
static void alarm_handler(int signum)
static void sig_handler(int signum)
{
/* Jut wake us up from waitpid */
/* Just wake us up from waitpid */
}
static struct sigaction alarm_action = {
.sa_handler = alarm_handler,
static struct sigaction sig_action = {
.sa_handler = sig_handler,
};
void test_harness_set_timeout(uint64_t time)
@ -106,8 +106,14 @@ int test_harness(int (test_function)(void), char *name)
test_start(name);
test_set_git_version(GIT_VERSION);
if (sigaction(SIGALRM, &alarm_action, NULL)) {
perror("sigaction");
if (sigaction(SIGINT, &sig_action, NULL)) {
perror("sigaction (sigint)");
test_error(name);
return 1;
}
if (sigaction(SIGALRM, &sig_action, NULL)) {
perror("sigaction (sigalrm)");
test_error(name);
return 1;
}