linux-kernel - Re: [PATCH v2] perf: fix segfault in `lock contention -b`

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Message-ID: <aYZkVQn_pUzn1CeD@x1>
Date: Fri, 6 Feb 2026 18:59:49 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Tycho Andersen <tycho@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, 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>,
	James Clark <james.clark@...aro.org>,
	Chun-Tse Shao <ctshao@...gle.com>, linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org, Ravi Bangoria <ravi.bangoria@....com>,
	K Prateek Nayak <kprateek.nayak@....com>
Subject: Re: [PATCH v2] perf: fix segfault in `lock contention -b`

On Thu, Feb 05, 2026 at 04:17:50PM -0800, Namhyung Kim wrote:
> On Thu, Feb 05, 2026 at 09:32:50AM -0700, Tycho Andersen wrote:
> > Check if btf loading failed, and don't do anything with it in
> > init_numa_data(). This leads to the following error message, instead of
> > just a crash:
> >     libbpf: kernel BTF is missing at '/sys/kernel/btf/vmlinux', was CONFIG_DEBUG_INFO_BTF enabled?
> >     libbpf: failed to find valid kernel BTF
> >     libbpf: kernel BTF is missing at '/sys/kernel/btf/vmlinux', was CONFIG_DEBUG_INFO_BTF enabled?
> >     libbpf: failed to find valid kernel BTF
> >     libbpf: Error loading vmlinux BTF: -ESRCH
> >     libbpf: failed to load BPF skeleton 'lock_contention_bpf': -ESRCH
> >     Failed to load lock-contention BPF skeleton
> >     lock contention BPF setup failed

> > Signed-off-by: Tycho Andersen (AMD) <tycho@...nel.org>
 
> Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks, applied to perf-tools-next,

- Arnaldo