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authorOleg Nesterov <oleg@tv-sign.ru>2008-03-02 21:44:44 +0300
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-03-03 14:53:16 -0800
commit821c7de7194e77afee1a69d50830a329a6d9af9f (patch)
tree6755cb5f57822c142b228ad8ca817c18b8f31884 /kernel/exit.c
parent05e83df624fe682bb8571cdb2c6d5284a99c3066 (diff)
downloadlinux-821c7de7194e77afee1a69d50830a329a6d9af9f.tar.gz
exit_notify: fix kill_orphaned_pgrp() usage with mt exit
1. exit_notify() always calls kill_orphaned_pgrp(). This is wrong, we should do this only when the whole process exits. 2. exit_notify() uses "current" as "ignored_task", obviously wrong. Use ->group_leader instead. Test case: void hup(int sig) { printf("HUP received\n"); } void *tfunc(void *arg) { sleep(2); printf("sub-thread exited\n"); return NULL; } int main(int argc, char *argv[]) { if (!fork()) { signal(SIGHUP, hup); kill(getpid(), SIGSTOP); exit(0); } pthread_t thr; pthread_create(&thr, NULL, tfunc, NULL); sleep(1); printf("main thread exited\n"); syscall(__NR_exit, 0); return 0; } output: main thread exited HUP received Hangup With this patch the output is: main thread exited sub-thread exited HUP received Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/exit.c')
-rw-r--r--kernel/exit.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 41c1edace97..cd20bf07e9e 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -750,7 +750,7 @@ static void forget_original_parent(struct task_struct *father)
* Send signals to all our closest relatives so that they know
* to properly mourn us..
*/
-static void exit_notify(struct task_struct *tsk)
+static void exit_notify(struct task_struct *tsk, int group_dead)
{
int state;
@@ -766,7 +766,8 @@ static void exit_notify(struct task_struct *tsk)
exit_task_namespaces(tsk);
write_lock_irq(&tasklist_lock);
- kill_orphaned_pgrp(tsk, NULL);
+ if (group_dead)
+ kill_orphaned_pgrp(tsk->group_leader, NULL);
/* Let father know we died
*
@@ -981,7 +982,7 @@ NORET_TYPE void do_exit(long code)
module_put(tsk->binfmt->module);
proc_exit_connector(tsk);
- exit_notify(tsk);
+ exit_notify(tsk, group_dead);
#ifdef CONFIG_NUMA
mpol_free(tsk->mempolicy);
tsk->mempolicy = NULL;