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Date: Fri, 5 Aug 2022 14:53:33 -0400 From: Steven Rostedt <rostedt@...dmis.org> To: Ivan Babrou <ivan@...udflare.com> Cc: Daniel Dao <dqminh@...udflare.com>, kernel-team <kernel-team@...udflare.com>, Ingo Molnar <mingo@...hat.com>, linux-kernel <linux-kernel@...r.kernel.org>, Masami Hiramatsu <mhiramat@...nel.org> Subject: Re: 5.15 ftrace bug when enabling function_graph On Fri, 5 Aug 2022 11:37:56 -0700 Ivan Babrou <ivan@...udflare.com> wrote: > root@foo:~# echo 'bpf_dispatcher_*_func' > > /sys/kernel/tracing/set_ftrace_notrace > > root@foo:~# trace-cmd record -p function_graph -l handle_mm_fault -P 3367417 > plugin 'function_graph' > Hit Ctrl^C to stop recording > [1459709.204253] ------------[ ftrace bug ]------------ > [1459709.204257] ftrace failed to modify > [1459709.204262] [<ffffffffac3ea960>] bpf_dispatcher_xdp_func+0x0/0x10 > [1459709.204275] actual: ffffffe9:ffffff9b:76:ffffffb0:14 > [1459709.204302] Setting ftrace call site to call ftrace function > [1459709.204305] ftrace record flags: 10000001 > [1459709.204309] (1) > expected tramp: ffffffffabc4bcb0 > [1459709.204325] ------------[ cut here ]------------ Did you reboot since the error happened? Because the command you showed should not have touched bpf_dispatcher_xdp_func. -- Steve
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