linux-kernel - Re: [syzbot] KASAN: use-after-free Read in put_pmu

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Message-ID: <Y6GIrqpDU331TTeB@hirez.programming.kicks-ass.net>
Date:   Tue, 20 Dec 2022 11:04:30 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     syzbot <syzbot+b8e8c01c8ade4fe6e48f@...kaller.appspotmail.com>
Cc:     acme@...nel.org, alexander.shishkin@...ux.intel.com,
        bpf@...r.kernel.org, jolsa@...nel.org,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        mark.rutland@....com, mingo@...hat.com, namhyung@...nel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KASAN: use-after-free Read in put_pmu_ctx

On Tue, Dec 20, 2022 at 12:43:25AM -0800, syzbot wrote:
> Hello,
> 
> syzbot has tested the proposed patch but the reproducer is still triggering an issue:
> INFO: rcu detected stall in corrupted
> 
> rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { P5791 } 2673 jiffies s: 2805 root: 0x0/T
> rcu: blocking rcu_node structures (internal RCU debug):

That is an entirely different issue methinks. Let me go write up a
Changelog for that thing and stuff it somewhere /urgent.