linux-kernel - [PATCH 2/3] tracing/kprobes: Make setup_boot_kprobe

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20260122032425.396074-1-tianyaxiong@kylinos.cn>
Date: Thu, 22 Jan 2026 11:24:25 +0800
From: Yaxiong Tian <tianyaxiong@...inos.cn>
To: axboe@...nel.dk,
	rostedt@...dmis.org,
	mhiramat@...nel.org,
	mathieu.desnoyers@...icios.com
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	Yaxiong Tian <tianyaxiong@...inos.cn>
Subject: [PATCH 2/3] tracing/kprobes: Make setup_boot_kprobe_events() asynchronous

During kernel boot, the setup_boot_kprobe_events() function causes
significant delays, increasing overall startup time.

The root cause is a lock contention chain: its child function
enable_boot_kprobe_events() requires the event_mutex, which is
already held by early_event_add_tracer(). early_event_add_tracer()
itself is blocked waiting for the trace_event_sem  read-write lock,
which is held for an extended period by trace_event_update_all().

To resolve this, we have moved the execution of
setup_boot_kprobe_events() to the eval_map_wq workqueue, allowing
it to run asynchronously.

Signed-off-by: Yaxiong Tian <tianyaxiong@...inos.cn>
---
 kernel/trace/trace_kprobe.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 9953506370a5..5e55a8fffd03 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -2031,6 +2031,13 @@ static __init int init_kprobe_trace_early(void)
 }
 core_initcall(init_kprobe_trace_early);
 
+static struct work_struct kprobe_trace_work __initdata;
+
+static void __init kprobe_trace_works_func(struct work_struct *work)
+{
+	setup_boot_kprobe_events();
+}
+
 /* Make a tracefs interface for controlling probe points */
 static __init int init_kprobe_trace(void)
 {
@@ -2048,7 +2055,12 @@ static __init int init_kprobe_trace(void)
 	trace_create_file("kprobe_profile", TRACE_MODE_READ,
 			  NULL, NULL, &kprobe_profile_ops);
 
-	setup_boot_kprobe_events();
+	if (eval_map_wq) {
+		INIT_WORK(&kprobe_trace_work, kprobe_trace_works_func);
+		queue_work(eval_map_wq, &kprobe_trace_work);
+	} else {
+		setup_boot_kprobe_events();
+	}
 
 	return 0;
 }
-- 
2.25.1