linux-kernel - Re: [PATCH][v3] hung_task: Panic after fixed number of hung tasks

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Message-ID: <b16d76de-688a-4697-bcfe-06f2785a1d3c@infradead.org>
Date: Mon, 13 Oct 2025 18:37:30 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: lirongqing <lirongqing@...du.com>, Jonathan Corbet <corbet@....net>,
 Russell King <linux@...linux.org.uk>, Joel Stanley <joel@....id.au>,
 Andrew Jeffery <andrew@...econstruct.com.au>,
 Andrew Morton <akpm@...ux-foundation.org>, Lance Yang
 <lance.yang@...ux.dev>, Masami Hiramatsu <mhiramat@...nel.org>,
 "Jason A . Donenfeld" <Jason@...c4.com>, Shuah Khan <shuah@...nel.org>,
 "Paul E . McKenney" <paulmck@...nel.org>, Petr Mladek <pmladek@...e.com>,
 Steven Rostedt <rostedt@...dmis.org>, Feng Tang
 <feng.tang@...ux.alibaba.com>,
 Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, Kees Cook
 <kees@...nel.org>, Arnd Bergmann <arnd@...db.de>,
 Phil Auld <pauld@...hat.com>, Joel Granados <joel.granados@...nel.org>,
 Jakub Kicinski <kuba@...nel.org>, Simon Horman <horms@...nel.org>,
 Anshuman Khandual <anshuman.khandual@....com>,
 Stanislav Fomichev <sdf@...ichev.me>,
 "Liam R . Howlett" <Liam.Howlett@...cle.com>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 David Hildenbrand <david@...hat.com>, Florian Westphal <fw@...len.de>,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org,
 wireguard@...ts.zx2c4.com, netdev@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH][v3] hung_task: Panic after fixed number of hung tasks

Hi--

On 10/12/25 4:50 AM, lirongqing wrote:
> From: Li RongQing <lirongqing@...du.com>
> 

> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index a51ab46..7d9a8ee 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -1992,14 +1992,20 @@
>  			the added memory block itself do not be affected.
>  
>  	hung_task_panic=
> -			[KNL] Should the hung task detector generate panics.
> -			Format: 0 | 1
> +			[KNL] Number of hung tasks to trigger kernel panic.
> +			Format: <int>
> +
> +			Set this to the number of hung tasks that must be
> +			detected before triggering a kernel panic.
> +
> +			0: don't panic
> +			1: panic immediately on first hung task
> +			N: panic after N hung tasks are detect

			                            are detected

>  
> -			A value of 1 instructs the kernel to panic when a
> -			hung task is detected. The default value is controlled
> -			by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
> -			option. The value selected by this boot parameter can
> -			be changed later by the kernel.hung_task_panic sysctl.
> +			The default value is controlled by the
> +			CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time option. The value
> +			selected by this boot parameter can be changed later by the
> +			kernel.hung_task_panic sysctl.
>  
>  	hvc_iucv=	[S390]	Number of z/VM IUCV hypervisor console (HVC)
>  				terminal devices. Valid values: 0..8

-- 
~Randy