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From: Leo Yan <leo.yan@arm.com>
To: Puranjay Mohan <puranjay12@gmail.com>
Cc: Will Deacon <will@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Rob Herring <robh+dt@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Alexei Starovoitov <ast@kernel.org>,
	Andrii Nakryiko <andrii@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Martin KaFai Lau <martin.lau@kernel.org>,
	Eduard Zingerman <eddyz87@gmail.com>,
	Kumar Kartikeya Dwivedi <memxor@gmail.com>,
	Breno Leitao <leitao@debian.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-perf-users@vger.kernel.org, kernel-team@meta.com
Subject: Re: [RFC PATCH] perf/arm64: Add BRBE support for bpf_get_branch_snapshot()
Date: Mon, 5 Jan 2026 21:22:13 +0000	[thread overview]
Message-ID: <20260105212213.GA336318@e132581.arm.com> (raw)
In-Reply-To: <CANk7y0j7hAJ7OcH_HgN0cVGnUh=iBz=iuD9sYZmSy-koMjB_cg@mail.gmail.com>

Hi,

On Fri, Jan 02, 2026 at 09:51:15PM +0000, Puranjay Mohan wrote:
> Hi Catalin, Will, Mark, and Rob.
> 
> I don't have access to BRBE enabled hardware and Qemu doesn't support
> this as well therefore I just sent the compile tested version.
> 
> Can you help me with testing this:
> 
> The relevant bpf self test is:
> 
> ./test_progs -t get_branch_snapshot
> #132     get_branch_snapshot:SKIP
> Summary: 1/0 PASSED, 1 SKIPPED, 0 FAILED
> 
> skipped for my setup as it is not supported.

eBPF selftest build is quite heavy (many dependencies), finally I built
it cleanly.

I did a test on FVP RevC, the test hit NULL pointer deference and kernel
panic in armv8pmu_sched_task().  See https://termbin.com/peg4, the
backtrace should can give you hints for the issue.

Thanks,
Leo

P.s. some logs are duplicate, this might be caused by two cores both hit
the NULL pointer issue ?


  reply	other threads:[~2026-01-05 21:22 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-01-02 21:40 [RFC PATCH] perf/arm64: Add BRBE support for bpf_get_branch_snapshot() Puranjay Mohan
2026-01-02 21:51 ` Puranjay Mohan
2026-01-05 21:22   ` Leo Yan [this message]
2026-01-05 21:46     ` Puranjay Mohan
2026-01-06 10:54       ` Leo Yan
2026-01-05 17:49 ` Mark Rutland
2026-01-05 19:31   ` Puranjay Mohan

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