From 98c42d945238c55ab56e5716e89553fb7de45b66 Mon Sep 17 00:00:00 2001 From: Vegard Nossum Date: Thu, 28 Jul 2016 15:48:32 -0700 Subject: [PATCH] kmemleak: don't hang if user disables scanning early If the user tries to disable automatic scanning early in the boot process using e.g.: echo scan=off > /sys/kernel/debug/kmemleak then this command will hang until SECS_FIRST_SCAN (= 60) seconds have elapsed, even though the system is fully initialised. We can fix this using interruptible sleep and checking if we're supposed to stop whenever we wake up (like the rest of the code does). Link: http://lkml.kernel.org/r/1468835005-2873-1-git-send-email-vegard.nossum@oracle.com Signed-off-by: Vegard Nossum Acked-by: Catalin Marinas Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/kmemleak.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/kmemleak.c b/mm/kmemleak.c index 04320d3adbef..086292f7c59d 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -1485,8 +1485,10 @@ static int kmemleak_scan_thread(void *arg) * Wait before the first scan to allow the system to fully initialize. */ if (first_run) { + signed long timeout = msecs_to_jiffies(SECS_FIRST_SCAN * 1000); first_run = 0; - ssleep(SECS_FIRST_SCAN); + while (timeout && !kthread_should_stop()) + timeout = schedule_timeout_interruptible(timeout); } while (!kthread_should_stop()) { -- 2.20.1