We were hitting a panic in production where we put too many times on the request queue. This is because we'd get the throttle_queue of the parent if we fork()'ed while we needed to be throttled, but we didn't have a reference on it. Instead just clear these flags on fork so the child doesn't pay for the sins of its father. Signed-off-by: Josef Bacik <josef@xxxxxxxxxxxxxx> --- kernel/fork.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/fork.c b/kernel/fork.c index 9440d61b925c..694ae0e56866 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -843,6 +843,11 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node) tsk->fail_nth = 0; #endif +#ifdef CONFIG_BLK_CGROUP + tsk->throttle_queue = NULL; + tsk->use_memdelay = 0; +#endif + return tsk; free_stack: -- 2.14.3
