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

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Message-ID: <000000000000a473b905f02e1c4d@google.com>
Date:   Mon, 19 Dec 2022 05:15:23 -0800
From:   syzbot <syzbot+b8e8c01c8ade4fe6e48f@...kaller.appspotmail.com>
To:     hdanton@...a.com, linux-kernel@...r.kernel.org,
        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: { P5552 } 2685 jiffies s: 2817 root: 0x0/T
rcu: blocking rcu_node structures (internal RCU debug):

Tested on:

commit:         f9ff5644 Merge tag 'hsi-for-6.2' of git://git.kernel.o..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=1337f01b880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3263313469e7ca77
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=10acb79d880000