linux-kernel - Re: [PATCH] tracing: Add WARN_ON_ONCE for syscall

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Message-ID: <20241128074623.063bf253@rorschach.local.home>
Date: Thu, 28 Nov 2024 07:46:23 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Tao Chen <chen.dylane@...il.com>
Cc: mhiramat@...nel.org, mathieu.desnoyers@...icios.com,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH] tracing: Add WARN_ON_ONCE for syscall_nr check

On Thu, 28 Nov 2024 19:53:19 +0800
Tao Chen <chen.dylane@...il.com> wrote:

> Now, x86_64 kernel not support to trace syscall for ia32 syscall.
> As a result, there is no any trace output when tracing a ia32 task.
> Like unreg_event_syscall_enter, add a WARN_ON_ONCE judgment for
> syscall_nr in perf_syscall_enter and ftrace_syscall_enter to give
> some message.

So on a system that has "panic_on_warn" set and they trace a 32 bit
system call, it will cause their system to crash. Is that the intended
behavior?

WARN*() is for self testing the kernel to detect real bugs, not to
inform users that something isn't supported.

BIG NAK!

-- Steve