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kselftests/sched: cleanup the child processes 

Previously, 'make -C sched run_tests' will block forever when it occurs
something wrong where the *selftests framework* is waiting for its child
processes to exit.

[root@iaas-rpma sched]# ./cs_prctl_test

 ## Create a thread/process/process group hiearchy
Not a core sched system
tid=74985, / tgid=74985 / pgid=74985: ffffffffffffffff
Not a core sched system
    tid=74986, / tgid=74986 / pgid=74985: ffffffffffffffff
Not a core sched system
        tid=74988, / tgid=74986 / pgid=74985: ffffffffffffffff
Not a core sched system
        tid=74989, / tgid=74986 / pgid=74985: ffffffffffffffff
Not a core sched system
        tid=74990, / tgid=74986 / pgid=74985: ffffffffffffffff
Not a core sched system
    tid=74987, / tgid=74987 / pgid=74985: ffffffffffffffff
Not a core sched system
        tid=74991, / tgid=74987 / pgid=74985: ffffffffffffffff
Not a core sched system
        tid=74992, / tgid=74987 / pgid=74985: ffffffffffffffff
Not a core sched system
        tid=74993, / tgid=74987 / pgid=74985: ffffffffffffffff

Not a core sched system
(268) FAILED: get_cs_cookie(0) == 0

 ## Set a cookie on entire process group
-1 = prctl(62, 1, 0, 2, 0)
core_sched create failed -- PGID: Invalid argument
(cs_prctl_test.c:272) -
[root@iaas-rpma sched]# ps
    PID TTY          TIME CMD
   4605 pts/2    00:00:00 bash
  74986 pts/2    00:00:00 cs_prctl_test
  74987 pts/2    00:00:00 cs_prctl_test
  74999 pts/2    00:00:00 ps

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Chris Hyser <chris.hyser@oracle.com>
Link: https://lore.kernel.org/r/20210902024333.75983-1-lizhijian@cn.fujitsu.com
This commit is contained in:
Li Zhijian 2021-09-02 10:43:33 +08:00 committed by Peter Zijlstra
parent d73df887b6
commit 1c36432b27
1 changed files with 18 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
tools/testing/selftests/sched/cs_prctl_test.c
View File

@ -62,6 +62,17 @@ enum pid_type {PIDTYPE_PID = 0, PIDTYPE_TGID, PIDTYPE_PGID};
const int THREAD_CLONE_FLAGS = CLONE_THREAD | CLONE_SIGHAND | CLONE_FS | CLONE_VM | CLONE_FILES;
struct child_args {
int num_threads;
int pfd[2];
int cpid;
int thr_tids[MAX_THREADS];
};
static struct child_args procs[MAX_PROCESSES];
static int num_processes = 2;
static int need_cleanup = 0;
static int _prctl(int option, unsigned long arg2, unsigned long arg3, unsigned long arg4,
unsigned long arg5)
{
@ -78,8 +89,14 @@ static int _prctl(int option, unsigned long arg2, unsigned long arg3, unsigned l
#define handle_error(msg) __handle_error(__FILE__, __LINE__, msg)
static void __handle_error(char *fn, int ln, char *msg)
{
int pidx;
printf("(%s:%d) - ", fn, ln);
perror(msg);
if (need_cleanup) {
for (pidx = 0; pidx < num_processes; ++pidx)
kill(procs[pidx].cpid, 15);
need_cleanup = 0;
}
exit(EXIT_FAILURE);
}
@ -106,13 +123,6 @@ static unsigned long get_cs_cookie(int pid)
return cookie;
}
struct child_args {
int num_threads;
int pfd[2];
int cpid;
int thr_tids[MAX_THREADS];
};
static int child_func_thread(void __attribute__((unused))*arg)
{
while (1)
@ -212,10 +222,7 @@ void _validate(int line, int val, char *msg)
int main(int argc, char *argv[])
{
struct child_args procs[MAX_PROCESSES];
int keypress = 0;
int num_processes = 2;
int num_threads = 3;
int delay = 0;
int res = 0;
@ -262,6 +269,7 @@ int main(int argc, char *argv[])
printf("\n## Create a thread/process/process group hiearchy\n");
create_processes(num_processes, num_threads, procs);
need_cleanup = 1;
disp_processes(num_processes, procs);
validate(get_cs_cookie(0) == 0);