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

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Date:   Tue, 20 Dec 2022 11:37:18 -0800
From:   syzbot <syzbot+b8e8c01c8ade4fe6e48f@...kaller.appspotmail.com>
To:     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, peterz@...radead.org, sdf@...gle.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KASAN: use-after-free Read in put_pmu_ctx

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: { P5778 } 2673 jiffies s: 2773 root: 0x0/T
rcu: blocking rcu_node structures (internal RCU debug):

Tested on:

commit:         13e3c779 Merge tag 'for-netdev' of https://git.kernel...
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git
console output: https://syzkaller.appspot.com/x/log.txt?x=12cb0e5d880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b0e91ad4b5f69c47
dashboard link: https://syzkaller.appspot.com/bug?extid=b8e8c01c8ade4fe6e48f
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
patch:          https://syzkaller.appspot.com/x/patch.diff?x=12df6a9b880000