linux-kernel - [PATCH v2 0/2] tracing: fprobe: Protect return handler from recursion loop

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Message-ID: <175852291163.307379.14414635977719513326.stgit@devnote2>
Date: Mon, 22 Sep 2025 15:35:11 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...nel.org>,
	Menglong Dong <menglong8.dong@...il.com>
Cc: jolsa@...nel.org,
	tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com,
	kees@...nel.org,
	samitolvanen@...gle.com,
	rppt@...nel.org,
	luto@...nel.org,
	mhiramat@...nel.org,
	ast@...nel.org,
	andrii@...nel.org,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org
Subject: [PATCH v2 0/2] tracing: fprobe: Protect return handler from recursion loop

The following series fixes a recursive loop issue on fprobe by adding
ftrace_test_recursion_trylock() in __ftrace_return_to_handler().
The previous version is here;

https://lore.kernel.org/all/175828305637.117978.4183947592750468265.stgit@devnote2/

This v2 removes WARN_ON from __ftrace_return_to_handler() and adds
kunit test cases for recursive call [2/2]. 

---

Masami Hiramatsu (Google) (2):
      tracing: fgraph: Protect return handler from recursion loop
      lib/test_fprobe: Add recursion check test cases


 kernel/trace/fgraph.c   |   12 ++++++
 lib/tests/test_fprobe.c |   92 ++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 102 insertions(+), 2 deletions(-)

--
Masami Hiramatsu (Google) <mhiramat@...nel.org>