linux-kernel - Re: [PATCH 0/2] tracing/wprobe: Fix to avoid inifinite watchpoint exception on arm64

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Message-ID: <aRdWAshGkWjgXW3L@willie-the-truck>
Date: Fri, 14 Nov 2025 16:17:06 +0000
From: Will Deacon <will@...nel.org>
To: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/2] tracing/wprobe: Fix to avoid inifinite watchpoint
 exception on arm64

On Tue, Nov 04, 2025 at 10:37:35PM +0900, Masami Hiramatsu wrote:
> Gently ping.
> 
> There is a bugfix (or strange behavior) on arm64 hw breakpoint but
> to fix it cleanly, it should change the perf itself (but I'm not
> sure why arm64 changes the behavior only for the default overflow
> handlers.) Anyone knows it?

It's because GDB expects to handle the stepping itself when using the
ptrace interface (with a custom overflow handler to deliver SIGTRAP).

Will