jffs2_garbage_collect_thread() can race with SIGCONT and sleep in TASK_STOPPED state after it was already sent. Add the new helper, kernel_signal_stop(), which does this correctly.
Signed-off-by: Oleg Nesterov <o...@redhat.com> --- fs/jffs2/background.c | 3 +-- include/linux/sched.h | 10 ++++++++++ 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/fs/jffs2/background.c b/fs/jffs2/background.c index f3145fd..53cc735 100644 --- a/fs/jffs2/background.c +++ b/fs/jffs2/background.c @@ -132,8 +132,7 @@ static int jffs2_garbage_collect_thread(void *_c) case SIGSTOP: jffs2_dbg(1, "%s(): SIGSTOP received\n", __func__); - set_current_state(TASK_STOPPED); - schedule(); + kernel_signal_stop(); break; case SIGKILL: diff --git a/include/linux/sched.h b/include/linux/sched.h index e714539..56e688c 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -2477,6 +2477,16 @@ static inline int kernel_dequeue_signal(siginfo_t *info) return ret; } +static inline void kernel_signal_stop(void) +{ + spin_lock_irq(¤t->sighand->siglock); + if (current->jobctl & JOBCTL_STOP_DEQUEUED) + __set_current_state(TASK_STOPPED); + spin_unlock_irq(¤t->sighand->siglock); + + schedule(); +} + extern void release_task(struct task_struct * p); extern int send_sig_info(int, struct siginfo *, struct task_struct *); extern int force_sigsegv(int, struct task_struct *); -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/