Subject: Re: [syzbot] KASAN: use-after-free Read in put_pmu_ctx

From: Peter Zijlstra <[email-masked]>
Date: Tue, 20 Dec 2022 11:04:30 +0100

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.