linux-kernel - [BUG] Possible deadlock in __perf_event_task_sched

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Message-ID: <AC2AQgCBJ-ETsVPPQmFlYKrr.1.1765449556480.Hmail.2200013188@stu.pku.edu.cn>
Date: Thu, 11 Dec 2025 18:39:16 +0800 (GMT+08:00)
From: Tianyu Li <lty218@....pku.edu.cn>
To: linux-kernel <linux-kernel@...r.kernel.org>
Cc: linux-perf-users <linux-perf-users@...r.kernel.org>, 
	namhyung <namhyung@...nel.org>, acme <acme@...nel.org>, 
	mingo <mingo@...hat.com>, peterz <peterz@...radead.org>, 
	"juri.lelli" <juri.lelli@...hat.com>, 
	"vincent.guittot" <vincent.guittot@...aro.org>, 
	xujiakai2025 <xujiakai2025@...as.ac.cn>, 
	"zhaoruilin22@...ls.ucas.ac.cn" <zhaoruilin22@...ls.ucas.ac.cn>
Subject: [BUG] Possible deadlock in __perf_event_task_sched_out

Hi,

I'm hitting a possible deadlock in __perf_event_task_sched_out. It's first detected via a fuzzing framework on Linux 6.18.0-rc6, and it also appears to be reproducible on v6.18. Since the report itself is already quite clear, I don’t want to risk adding inaccurate analysis here. Instead, I have attached the relevant information and materials below for your review.

    Kernel source: https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.18.tar.xz
    Kernel configuration: https://github.com/j1akai/KConfigFuzz_bug/raw/refs/heads/main/x86/mainline-config
    Kernel log(fuzz report): https://github.com/Wxm-233/KConfigFuzz_crashes/raw/refs/heads/main/8facfbb5acbe6b82e7b5bf8d27be8930172c96c1/repro.report
    Kernel log(repro on Linux-v6.18): https://github.com/Wxm-233/KConfigFuzz_crashes/raw/refs/heads/main/8facfbb5acbe6b82e7b5bf8d27be8930172c96c1/repro_report0
    Reproduction C Code: https://github.com/Wxm-233/KConfigFuzz_crashes/raw/refs/heads/main/8facfbb5acbe6b82e7b5bf8d27be8930172c96c1/repro.cprog
    Syscall sequence for reproduction (more precise): https://github.com/Wxm-233/KConfigFuzz_crashes/raw/refs/heads/main/8facfbb5acbe6b82e7b5bf8d27be8930172c96c1/repro.prog
    GCC info: https://github.com/Wxm-233/KConfigFuzz_crashes/raw/refs/heads/main/0f85fc661af1e3c69b26b97eaaaa43d629de449c/gccinfo

I hope this report helps in identifying and resolving the issue. Thanks for your time and attention.

Best regards.