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Message-ID: <20250617121043.2b0488e5@gandalf.local.home> Date: Tue, 17 Jun 2025 12:10:43 -0400 From: Steven Rostedt <rostedt@...dmis.org> To: duchangbin <changbin.du@...wei.com> Cc: "mhiramat@...nel.org" <mhiramat@...nel.org>, "mathieu.desnoyers@...icios.com" <mathieu.desnoyers@...icios.com>, "acme@...nel.org" <acme@...nel.org>, "namhyung@...nel.org" <namhyung@...nel.org>, "linux-trace-kernel@...r.kernel.org" <linux-trace-kernel@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org> Subject: Re: [Bug] Kernel BUG in function_graph tracer in linux kernel 6.16.0-rc2+ On Tue, 17 Jun 2025 10:58:09 +0000 duchangbin <changbin.du@...wei.com> wrote: > Hello, > This is a bug report for kernel function_graph tracer when enabling the > 'funcgraph-args' option. It seems that the registration logic is not quite > correct, but I haven't conducted an in-depth analysis of the issue yet. > This problem has already existed since version 6.15 at least. > > The following are the steps to reproduce the issue. > 1. Enable CONFIG_FUNCTION_GRAPH_TRACER CONFIG_PROBE_EVENTS_BTF_ARGS > 2. Trace a function using function_graph tracer and enable the 'funcgraph-args' option. > # echo 1 > /sys/kernel/debug/tracing/options/funcgraph-args FYI, please start using /sys/kernel/tracing directly. I want to deprecate /sys/kernel/debug/tracing. > # perf ftrace -G vfs_read Thanks for the report, I posted the fix: https://lore.kernel.org/linux-trace-kernel/20250617120830.24fbdd62@gandalf.local.home/T/#u -- Steve
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