linux-kernel - Re: [GIT PULL] ftrace: Updates for v6.14

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Message-ID: <20250217114918.10397-A-hca@linux.ibm.com>
Date: Mon, 17 Feb 2025 12:49:18 +0100
From: Heiko Carstens <hca@...ux.ibm.com>
To: Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Sven Schnelle <svens@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>
Subject: Re: [GIT PULL] ftrace: Updates for v6.14

Hi Steven, Masami,

On Sun, Jan 19, 2025 at 07:31:34PM -0500, Steven Rostedt wrote:
> ftrace updates for v6.14:
> 
> - Have fprobes built on top of function graph infrastructure

this seems to cause a regression:

When I run tools/testing/selftests/ftrace/ftracetest I now end up with all
functions being enabled for ftrace after the test suite ran:

$ wc -l /sys/kernel/debug/tracing/enabled_functions
50779 /sys/kernel/debug/tracing/enabled_functions

$ cat /sys/kernel/debug/tracing/enabled_functions
...
down (1)           
down_interruptible (1)           
down_killable (1)           

$ cat /sys/kernel/debug/tracing/current_tracer
nop

Bisected to commit 4346ba160409 ("fprobe: Rewrite fprobe on function-graph
tracer"). Before this commit there were no ftrace enabled functions after the
test suite finished:

$ wc -l /sys/kernel/debug/tracing/enabled_functions
0 /sys/kernel/debug/tracing/enabled_functions

This is on s390 with defconfig.