+ hung_task-log-summary-line-when-warning-budget-is-exhausted.patch added to mm-nonmm-unstable branch

+ hung_task-log-summary-line-when-warning-budget-is-exhausted.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: hung_task: log summary line when warning budget is exhausted
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     hung_task-log-summary-line-when-warning-budget-is-exhausted.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/hung_task-log-summary-line-when-warning-budget-is-exhausted.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days

------------------------------------------------------
From: Aaron Tomlin <atomlin@atomlin.com>
Subject: hung_task: log summary line when warning budget is exhausted
Date: Sat, 29 Aug 2026 10:53:21 -0400

Once the warning budget is exhausted, hung_task_info() normally stops
printing per-task details.  When panic is triggered, full details are
still printed so diagnostics remain available before panic.

To retain visibility without restoring per-task output after budget
exhaustion, emit a single aggregate summary line at the end of each
watchdog scan that detects hung tasks with an exhausted budget.  This
keeps non-panic per-task reports budgeted during system-wide hangs.

Link: https://lore.kernel.org/20260829145321.18423-3-atomlin@atomlin.com
Signed-off-by: Aaron Tomlin <atomlin@atomlin.com>
Suggested-by: Petr Mladek <pmladek@suse.com>
Suggested-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Bradley Morgan <brads@mainlining.org>
Cc: David Laight <david.laight.linux@gmail.com>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/hung_task.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/kernel/hung_task.c~hung_task-log-summary-line-when-warning-budget-is-exhausted
+++ a/kernel/hung_task.c
@@ -277,7 +277,7 @@ static void hung_task_info(struct task_s
 		debug_show_blocker(t, timeout);
 
 		if (!hung_task_warnings_budget)
-			pr_info("Future hung task reports are suppressed, see sysctl kernel.hung_task_warnings\n");
+			pr_info("hung_task: further per-task details suppressed until warning budget is reset or panic is triggered (see sysctl kernel.hung_task_warnings)\n");
 	}
 
 	touch_nmi_watchdog();
@@ -363,6 +363,10 @@ static void check_hung_uninterruptible_t
 		return;
 	}
 
+	if (!hung_task_warnings_budget && !hung_task_call_panic)
+		pr_info("hung_task: %lu hung tasks detected, warning budget exhausted\n",
+			this_round_count);
+
 	if (need_warning || hung_task_call_panic) {
 		si_mask |= SYS_INFO_LOCKS;
 
_

Patches currently in -mm which might be from atomlin@atomlin.com are

hung_task-reset-warning-budget-when-problem-gets-resolved.patch
hung_task-log-summary-line-when-warning-budget-is-exhausted.patch

+ hung_task-log-summary-line-when-warning-budget-is-exhausted.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: hung_task: log summary line when warning budget is exhausted
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     hung_task-log-summary-line-when-warning-budget-is-exhausted.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/hung_task-log-summary-line-when-warning-budget-is-exhausted.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days

------------------------------------------------------
From: Aaron Tomlin <atomlin@atomlin.com>
Subject: hung_task: log summary line when warning budget is exhausted
Date: Sun,  4 Oct 2026 12:36:10 -0400

Once the warning budget is exhausted, hung_task_info() normally stops
printing per-task details. When panic is triggered, full details are
still printed so diagnostics remain available before panic.

To retain visibility without restoring per-task output after budget
exhaustion, emit a single aggregate summary line at the end of each
watchdog scan that detects hung tasks with an exhausted budget. This
keeps non-panic per-task reports budgeted during system-wide hangs.

Link: https://lore.kernel.org/20261004163610.413506-3-atomlin@atomlin.com
Signed-off-by: Aaron Tomlin <atomlin@atomlin.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Suggested-by: Petr Mladek <pmladek@suse.com>
Suggested-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Bradley Morgan <brads@mainlining.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: David Laight <david.laight.linux@gmail.com>
Cc: Daniel Vacek <neelx@suse.com>
Cc: Sean Ashe <sean@ashe.io>
Cc: <chjohnst@gmail.com>
Cc: <steve@abita.co>
Cc: <mproche@gmail.com>
Cc: <nick.lange@gmail.com>
---

 kernel/hung_task.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/kernel/hung_task.c~hung_task-log-summary-line-when-warning-budget-is-exhausted
+++ a/kernel/hung_task.c
@@ -276,8 +276,8 @@ static void hung_task_info(struct task_s
 		sched_show_task(t);
 		debug_show_blocker(t, timeout);
 
-		if (!hung_task_warnings_budget)
-			pr_info("Future hung task reports are suppressed, see sysctl kernel.hung_task_warnings\n");
+		if (!hung_task_warnings_budget && !hung_task_call_panic)
+			pr_info("hung_task: further per-task details suppressed until warning budget is reset (see sysctl kernel.hung_task_warnings)\n");
 	}
 
 	touch_nmi_watchdog();
@@ -363,6 +363,10 @@ static void check_hung_uninterruptible_t
 		return;
 	}
 
+	if (!hung_task_warnings_budget && !hung_task_call_panic)
+		pr_info("hung_task: %lu hung tasks detected, warning budget exhausted\n",
+			this_round_count);
+
 	if (need_warning || hung_task_call_panic) {
 		si_mask |= SYS_INFO_LOCKS;
 
_

Patches currently in -mm which might be from atomlin@atomlin.com are

hung_task-reset-warning-budget-when-problem-gets-resolved.patch
hung_task-log-summary-line-when-warning-budget-is-exhausted.patch