The patch titled
Subject: hung_task: ignore hung_task_warnings when hung_task_panic is enabled
has been added to the -mm mm-nonmm-unstable branch. Its filename is
hung_task-ignore-hung_task_warnings-when-hung_task_panic-is-enabled.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/hung_task-ignore-hung_task_warnings-when-hung_task_panic-is-enabled.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Yongliang Gao <leonylgao@xxxxxxxxxxx>
Subject: hung_task: ignore hung_task_warnings when hung_task_panic is enabled
Date: Thu, 13 Jun 2024 11:31:59 +0800
If hung_task_panic is enabled, don't consider the value of
hung_task_warnings and display the information of the hung tasks.
In some cases, hung_task_panic might not be initially set up, after
several hung tasks occur, the hung_task_warnings count reaches zero. If
hung_task_panic is set up later, it may not display any helpful hung task
info in dmesg, only showing messages like:
Kernel panic - not syncing: hung_task: blocked tasks
CPU: 3 PID: 58 Comm: khungtaskd Not tainted 6.10.0-rc3 #19
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
Call Trace:
<TASK>
panic+0x2f3/0x320
watchdog+0x2dd/0x510
? __pfx_watchdog+0x10/0x10
kthread+0xe0/0x110
? __pfx_kthread+0x10/0x10
ret_from_fork+0x2f/0x40
? __pfx_kthread+0x10/0x10
ret_from_fork_asm+0x1a/0x30
</TASK>
Link: https://lkml.kernel.org/r/20240613033159.3446265-1-leonylgao@xxxxxxxxx
Signed-off-by: Yongliang Gao <leonylgao@xxxxxxxxxxx>
Reviewed-by: Huang Cun <cunhuang@xxxxxxxxxxx>
Cc: Joel Granados <j.granados@xxxxxxxxxxx>
Cc: John Siddle <jsiddle@xxxxxxxxxx>
Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/hung_task.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/hung_task.c~hung_task-ignore-hung_task_warnings-when-hung_task_panic-is-enabled
+++ a/kernel/hung_task.c
@@ -127,7 +127,7 @@ static void check_hung_task(struct task_
* Ok, the task did not get scheduled for more than 2 minutes,
* complain:
*/
- if (sysctl_hung_task_warnings) {
+ if (sysctl_hung_task_warnings || hung_task_call_panic) {
if (sysctl_hung_task_warnings > 0)
sysctl_hung_task_warnings--;
pr_err("INFO: task %s:%d blocked for more than %ld seconds.\n",
_
Patches currently in -mm which might be from leonylgao@xxxxxxxxxxx are
hung_task-ignore-hung_task_warnings-when-hung_task_panic-is-enabled.patch
