linux-kernel - [PATCH] mm: Add process info to bad rss-counter warning

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Message-ID: <20250723100901.1909683-1-liuqiye2025@163.com>
Date: Wed, 23 Jul 2025 18:09:00 +0800
From: Xuanye Liu <liuqiye2025@....com>
To: Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
	Kees Cook <kees@...nel.org>
Cc: Xuanye Liu <liuqiye2025@....com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH] mm: Add process info to bad rss-counter warning

Enhance the debugging information in check_mm() by including the
process name and PID when reporting bad rss-counter states. This
helps identify which process is associated with the memory accounting
issue.

Signed-off-by: Xuanye Liu <liuqiye2025@....com>
---
 kernel/fork.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index cfe2f1df5f27..e02fa515b77c 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -584,9 +584,12 @@ static void check_mm(struct mm_struct *mm)
 	for (i = 0; i < NR_MM_COUNTERS; i++) {
 		long x = percpu_counter_sum(&mm->rss_stat[i]);
 
-		if (unlikely(x))
-			pr_alert("BUG: Bad rss-counter state mm:%p type:%s val:%ld\n",
-				 mm, resident_page_types[i], x);
+		if (unlikely(x)) {
+			pr_alert("BUG: Bad rss-counter state mm:%p type:%s val:%ld Comm:%s Pid:%d\n",
+				 mm, resident_page_types[i], x,
+				 current->comm,
+				 task_pid_nr(current));
+		}
 	}
 
 	if (mm_pgtables_bytes(mm))
-- 
2.43.0