4.4-stable review patch. If anyone has any objections, please let me know.
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From: Breno Leitao leitao@debian.org
[ Upstream commit 7c27a26e1ed5a7dd709aa19685d2c98f64e1cf0c ]
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 --- tools/testing/selftests/powerpc/harness.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-)
--- a/tools/testing/selftests/powerpc/harness.c +++ b/tools/testing/selftests/powerpc/harness.c @@ -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, };
int test_harness(int (test_function)(void), char *name) @@ -101,8 +101,14 @@ int test_harness(int (test_function)(voi 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; }