linux-kernel - [PATCH] stacktrace: do not trace user stack for user

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Message-ID: <20250623115914.12076-1-jqqlijiazi@gmail.com>
Date: Mon, 23 Jun 2025 19:59:11 +0800
From: Jiazi Li <jqqlijiazi@...il.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Jiazi Li <jqqlijiazi@...il.com>,
	linux-kernel@...r.kernel.org,
	"peixuan.qiu" <peixuan.qiu@...nssion.com>
Subject: [PATCH] stacktrace: do not trace user stack for user_worker tasks

Tasks with PF_USER_WORKER flag also only run in kernel space,
so do not trace user stack for these tasks.

Signed-off-by: Jiazi Li <jqqlijiazi@...il.com>
Signed-off-by: peixuan.qiu <peixuan.qiu@...nssion.com>
---
 kernel/stacktrace.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c
index afb3c116da91..82fbccdd1a24 100644
--- a/kernel/stacktrace.c
+++ b/kernel/stacktrace.c
@@ -228,8 +228,8 @@ unsigned int stack_trace_save_user(unsigned long *store, unsigned int size)
 		.size	= size,
 	};
 
-	/* Trace user stack if not a kernel thread */
-	if (current->flags & PF_KTHREAD)
+	/* Skip tasks that do not return to userspace */
+	if (current->flags & (PF_KTHREAD | PF_USER_WORKER))
 		return 0;
 
 	arch_stack_walk_user(consume_entry, &c, task_pt_regs(current));
-- 
2.49.0