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Date: Fri, 6 Feb 2026 18:59:49 -0300
From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Namhyung Kim <namhyung@kernel.org>
Cc: Tycho Andersen <tycho@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>, Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@kernel.org>, Ian Rogers <irogers@google.com>,
	Adrian Hunter <adrian.hunter@intel.com>,
	James Clark <james.clark@linaro.org>,
	Chun-Tse Shao <ctshao@google.com>, linux-perf-users@vger.kernel.org,
	linux-kernel@vger.kernel.org, Ravi Bangoria <ravi.bangoria@amd.com>,
	K Prateek Nayak <kprateek.nayak@amd.com>
Subject: Re: [PATCH v2] perf: fix segfault in `lock contention -b`
Message-ID: <aYZkVQn_pUzn1CeD@x1>
References: <20260205163250.1980640-1-tycho@kernel.org>
 <aYUzLjODMw2NqEzq@google.com>
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In-Reply-To: <aYUzLjODMw2NqEzq@google.com>

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@kernel.org>
 
> Acked-by: Namhyung Kim <namhyung@kernel.org>

Thanks, applied to perf-tools-next,

- Arnaldo