From 523a10e8fa16283ef5e50fcb9462999f2bcaf7a2 Mon Sep 17 00:00:00 2001 From: "he, bo" Date: Sat, 24 Nov 2018 13:30:40 +0800 Subject: [PATCH 1/2] add rcu hung task detect Change-Id: If8791c7f4f250b44c04927c1f5c0ca82f2fadc01 Tracked-On: Signed-off-by: he, bo --- kernel/rcu/update.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index 39cb23d..81db882 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -362,8 +362,13 @@ void __wait_rcu_gp(bool checktiny, int n, call_rcu_func_t *crcu_array, for (j = 0; j < i; j++) if (crcu_array[j] == crcu_array[i]) break; - if (j == i) - wait_for_completion(&rs_array[i].completion); + if (j == i) { + trace_printk("bobo: start wait for rcu gp\n"); + if(!wait_for_completion_timeout(&rs_array[i].completion, 3*HZ)) + panic("hung_task: blocked tasks in rcu"); + trace_printk("bobo: finish wait for rcu gp\n"); + + } destroy_rcu_head_on_stack(&rs_array[i].head); } } -- 2.7.4