[PATCH 4.19 243/313] kernel/hung_task.c: force console verbose before panic

From: Greg Kroah-Hartman
Date: Mon Feb 11 2019 - 09:50:21 EST

4.19-stable review patch. If anyone has any objections, please let me know.


[ Upstream commit 168e06f7937d96c7222037d8a05565e8a6eb00fe ]

Based on commit 401c636a0eeb ("kernel/hung_task.c: show all hung tasks
before panic"), we could get the call stack of hung task.

However, if the console loglevel is not high, we still can not see the
useful panic information in practice, and in most cases users don't set
console loglevel to high level.

This patch is to force console verbose before system panic, so that the
real useful information can be seen in the console, instead of being
like the following, which doesn't have hung task information.

INFO: task init:1 blocked for more than 120 seconds.
Tainted: G U W 4.19.0-quilt-2e5dc0ac-g51b6c21d76cc #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Kernel panic - not syncing: hung_task: blocked tasks
CPU: 2 PID: 479 Comm: khungtaskd Tainted: G U W 4.19.0-quilt-2e5dc0ac-g51b6c21d76cc #1
Call Trace:
reboot: panic mode set: p,w
Kernel Offset: 0x34000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)

Link: http://lkml.kernel.org/r/27240C0AC20F114CBF8149A2696CBE4A6015B675@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Chuansheng Liu <chuansheng.liu@xxxxxxxxx>
Reviewed-by: Petr Mladek <pmladek@xxxxxxxx>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
kernel/hung_task.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index aa3c51f300aa..9eca2371f189 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -111,8 +111,11 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)


- if (!sysctl_hung_task_warnings && !sysctl_hung_task_panic)
- return;
+ if (sysctl_hung_task_panic) {
+ console_verbose();
+ hung_task_show_lock = true;
+ hung_task_call_panic = true;
+ }

* Ok, the task did not get scheduled for more than 2 minutes,
@@ -134,11 +137,6 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)

- if (sysctl_hung_task_panic) {
- hung_task_show_lock = true;
- hung_task_call_panic = true;
- }