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From: Nam Cao <namcao@linutronix.de>
To: naveen@kernel.org, anil.s.keshavamurthy@intel.com,
	davem@davemloft.net, mhiramat@kernel.org,
	linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org
Cc: john.ogness@linutronix.de
Subject: kprobe on local function
Date: Wed, 22 Jan 2025 08:59:39 +0100	[thread overview]
Message-ID: <20250122075939.qw7HsuMd@linutronix.de> (raw)

Hi,

I installed a kretprobe on the function "rt_mutex_slowunlock". Although the
function is called, the probe is never hit.

The reason is because there are 3 copies of rt_mutex_slowunlock() in
vmlinux (at least for x86 defconfig + CONFIG_PREEMPT_RT). But probe point
is only installed in 1 copy.

Is this considered a bug? Or is kprobe not intended to be used for local
function? Should we modify kprobe to support such cases?

Best regards,
Nam

             reply	other threads:[~2025-01-22  7:59 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-01-22  7:59 Nam Cao [this message]
2025-01-22 22:29 ` kprobe on local function Steven Rostedt
2025-01-23  1:48   ` Masami Hiramatsu
2025-01-23  2:42     ` Nam Cao
2025-01-23  2:48       ` Steven Rostedt
2025-01-24 16:16       ` Masami Hiramatsu
2025-01-29  6:41         ` Nam Cao

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