From: Yongliang Gao Date: Thu, 13 Jun 2024 03:31:59 +0000 (+0800) Subject: hung_task: ignore hung_task_warnings when hung_task_panic is enabled X-Git-Tag: v6.11-rc1~84^2~36 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=abd8ac05570cf1488a311f95c4c539fbe119d5da;p=thirdparty%2Fkernel%2Flinux.git hung_task: ignore hung_task_warnings when hung_task_panic is enabled 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: 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 Link: https://lkml.kernel.org/r/20240613033159.3446265-1-leonylgao@gmail.com Signed-off-by: Yongliang Gao Reviewed-by: Huang Cun Cc: Joel Granados Cc: John Siddle Cc: Kent Overstreet Signed-off-by: Andrew Morton --- diff --git a/kernel/hung_task.c b/kernel/hung_task.c index 1d92016b0b3c4..6ca859715d8a3 100644 --- a/kernel/hung_task.c +++ b/kernel/hung_task.c @@ -127,7 +127,7 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout) * 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",