On Wed, 2025-10-15 at 14:36 +0800, lirongqing wrote:

From: Li RongQing <redacted>

Currently, when 'hung_task_panic' is enabled, the kernel panics
immediately upon detecting the first hung task. However, some hung
tasks are transient and allow system recovery, while persistent hangs
should trigger a panic when accumulating beyond a threshold.

Extend the 'hung_task_panic' sysctl to accept a threshold value
specifying the number of hung tasks that must be detected before
triggering a kernel panic. This provides finer control for environments
where transient hangs may occur but persistent hangs should be fatal.

The sysctl now accepts:
- 0: don't panic (maintains original behavior)
- 1: panic on first hung task (maintains original behavior)
- N > 1: panic after N hung tasks are detected in a single scan

This maintains backward compatibility while providing flexibility for
different hang scenarios.

Signed-off-by: Li RongQing <redacted>
Cc: Andrew Jeffery <andrew@codeconstruct.com.au>
Cc: Anshuman Khandual <redacted>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David Hildenbrand <redacted>
Cc: Florian Wesphal <fw@strlen.de>
Cc: Jakub Kacinski <kuba@kernel.org>
Cc: Jason A. Donenfeld <jason@zx2c4.com>
Cc: Joel Granados <joel.granados@kernel.org>
Cc: Joel Stanley <joel@jms.id.au>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kees Cook <kees@kernel.org>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam Howlett <redacted>
Cc: Lorenzo Stoakes <redacted>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phil Auld <redacted>
Cc: Randy Dunlap <redacted>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Simon Horman <horms@kernel.org>
Cc: Stanislav Fomichev <sdf@fomichev.me>
Cc: Steven Rostedt <rostedt@goodmis.org>
---
diff with v3: comments modification, suggested by Lance, Masami, Randy and Petr
diff with v2: do not add a new sysctl, extend hung_task_panic, suggested by Kees Cook

 Documentation/admin-guide/kernel-parameters.txt      | 20 +++++++++++++-------
 Documentation/admin-guide/sysctl/kernel.rst          |  9 +++++----
 arch/arm/configs/aspeed_g5_defconfig                 |  2 +-

For the aspeed_g5_defconfig change:

Acked-by: Andrew Jeffery <andrew@codeconstruct.com.au>