linux-kernel - Re: [PATCH] hung_task: Panic after fixed number of hung tasks

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Message-ID: <20250925073717.7636-1-hdanton@sina.com>
Date: Thu, 25 Sep 2025 15:37:16 +0800
From: Hillf Danton <hdanton@...a.com>
To: lirongqing <lirongqing@...du.com>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] hung_task: Panic after fixed number of hung tasks

On Thu, 25 Sep 2025 14:06:05 +0800
> From: Li RongQing <lirongqing@...du.com>
> 
> Currently, when hung_task_panic is enabled, kernel will panic immediately
> upon detecting the first hung task. However, some hung tasks are transient
> and the system can recover fully, while others are unrecoverable and
> trigger consecutive hung task reports, and a panic is expected.
> 
> This commit adds a new sysctl parameter hung_task_count_to_panic to allows
> specifying the number of consecutive hung tasks that must be detected
> before triggering a kernel panic. This provides finer control for
> environments where transient hangs maybe happen but persistent hangs should
> still be fatal.
> 
Given transient, bumping sysctl_hung_task_timeout_secs up alone helps.