linux-kernel - Re: perf --help triggers an assertion

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Message-ID: <aMM7PtxJx83aUJ7z@google.com>
Date: Thu, 11 Sep 2025 14:12:30 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Guilherme Amadio <amadio@...too.org>, Ian Rogers <irogers@...gle.com>,
	adrian.hunter@...el.com, jolsa@...nel.org,
	kan.liang@...ux.intel.com, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org, mingo@...nel.org,
	peterz@...radead.org
Subject: Re: perf --help triggers an assertion

On Thu, Sep 11, 2025 at 05:02:52PM -0300, Arnaldo Carvalho de Melo wrote:
> On Wed, Sep 10, 2025 at 02:52:25PM +0200, Guilherme Amadio wrote:
> > On Tue, Sep 09, 2025 at 11:31:51AM -0700, Ian Rogers wrote:
> > > On Tue, Sep 9, 2025 at 2:49 AM Guilherme Amadio <amadio@...too.org> wrote:
> > > > I was updating perf's package in Gentoo Linux and noticed some problems
> > > > which were not there before. I tested with the version below and the problem
> > > > still seems to be there. perf --help triggers an assertion (see below).
> > > > Looking in the list, it seems related to the patch below:
> 
> > > > https://lore.kernel.org/linux-perf-users/20250701201027.1171561-3-namhyung@kernel.org/
> 
> <SNIP>
> 
> > > I tried to reproduce the same version with various options: DEBUG=1
> > > -UNDEBUG in EXTRA_CFLAGS, -fsanitize=address. Being in various
> > > directories with "perf-" prefixed files. I'm afraid I wasn't able to
> > > reproduce. The assert is trying to avoid a memory leak, so
> > > non-critical, and I couldn't in a quick inspection eye-ball an issue.
> > > Without getting a reproduction I don't think I can make progress with
> > > the issue.
>  
> > I do not have any special setup on my machine (if you consider Gentoo
> > not special, of course). I just did a git bisect and arrived at commit
> > 9401d1771dad99bfc795dd2ae0c292343fd1f78d, which is the commit I linked
> > above. I used>
> 
> ⬢ [acme@...lbx perf-tools-next]$ git show 9401d1771dad99bfc795dd2ae0c292343fd1f78d
> fatal: bad object 9401d1771dad99bfc795dd2ae0c292343fd1f78d
> ⬢ [acme@...lbx perf-tools-next]$ 
> 
> Looking for the patch title I got to this one:
> 
> commit 1fdf938168c4d26fa279d4f204768690d1f9c4ae
> Author: Namhyung Kim <namhyung@...nel.org>
> Date:   Tue Jul 1 13:10:27 2025 -0700
> 
>     perf tools: Fix use-after-free in help_unknown_cmd()

Sorry for the trouble.  The hupu's patch should fix the problem.

Thanks,
Namhyung