linux-kernel - Re: [PATCH v5 6/8] selftests: tracing: Add a basic testcase for wprobe

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Message-ID: <aPvwGhMBJqMKcC9D@finisterre.sirena.org.uk>
Date: Fri, 24 Oct 2025 22:31:06 +0100
From: Mark Brown <broonie@...nel.org>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, x86@...nel.org,
	Jinchao Wang <wangjinchao600@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Ian Rogers <irogers@...gle.com>, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, Aishwarya.TCV@....com
Subject: Re: [PATCH v5 6/8] selftests: tracing: Add a basic testcase for
 wprobe

On Tue, Sep 23, 2025 at 10:17:47AM +0900, Masami Hiramatsu (Google) wrote:
> From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> 
> Add 'add_remove_wprobe.tc' testcase for testing wprobe event that
> tests adding and removing operations of the wprobe event.

Since this series has landed in -next we've been seeing hangs on a range
of arm64 platforms running the ftrace tests, it looks like it's all of
them.  Unfortunately the systems lock up with no output as soon as they
start trying to do something with wprobes:

# ok 19 Generic dynamic event - add/remove kprobe events
# ok 20 Generic dynamic event - add/remove synthetic events
# ok 21 Generic dynamic event - add/remove tracepoint probe events
# ok 22 Generic dynamic event - add/remove tracepoint probe events on module
# ok 23 Generic dynamic event - add/remove/test uprobe events

the next test being add_remove_wprobe.tc, which doesn't seem to
complete.  Full log (for what little it's worth):

   https://lava.sirena.org.uk/scheduler/job/2000440#L1860

I turned on -vvv logging and that generated the rather spectacularly
more verbose:

   https://lava.sirena.org.uk/scheduler/job/2000676/log_file/plain

(in a somewhat processed format unfortunately.).  Looking at that log I
do notice a bunch of "unexpected operators" reported by the shell, these
systems are running dash not bash, though that doesn't seem related.  It
looks like the script hangs in reset_trigger_file while grepping the
trigger files rather than actually trying to do the test.

Sorry about the delay in reporting this.

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