Re: [PATCH] perf/bpf: Fix data race in __perf_event_overflow

Peter Zijlstra <[email protected]>
Newsgroups org.kernel.vger.linux-perf-users,org.kernel.vger.bpf,org.kernel.vger.linux-kernel,org.kernel.vger.linux-trace-kernel
Message-ID <[email protected]> 
On Wed, Aug 12, 2026 at 05:23:31AM +0530, Deepanshu Kartikey wrote:
> perf_event_detach_bpf_prog() writes event->prog = NULL
> under bpf_event_mutex, while __perf_event_overflow() reads
> event->prog concurrently without any lock protection. This
> causes a data race detected by KCSAN.

IIRC perf_event_free_pbf_prog() was supposed to be called after the
event is shut down, so there is no possible concurrency.
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