linux-kernel - Re: BUG: using __this_cpu_read() in preemptible code in trace_hardirqs

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Date:   Fri, 16 Oct 2020 13:33:05 -0700
From:   syzbot <syzbot+53f8ce8bbc07924b6417@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org, mingo@...nel.org, mingo@...hat.com,
        netdev@...r.kernel.org, peterz@...radead.org, rostedt@...dmis.org,
        syzkaller-bugs@...glegroups.com, will@...nel.org
Subject: Re: BUG: using __this_cpu_read() in preemptible code in trace_hardirqs_on

syzbot has bisected this issue to:

commit 4d004099a668c41522242aa146a38cc4eb59cb1e
Author: Peter Zijlstra <peterz@...radead.org>
Date:   Fri Oct 2 09:04:21 2020 +0000

    lockdep: Fix lockdep recursion

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=174a766f900000
start commit:   9ff9b0d3 Merge tag 'net-next-5.10' of git://git.kernel.org..
git tree:       net-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=14ca766f900000
console output: https://syzkaller.appspot.com/x/log.txt?x=10ca766f900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d13c3fa80bc4bcc1
dashboard link: https://syzkaller.appspot.com/bug?extid=53f8ce8bbc07924b6417
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15b63310500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1565657f900000

Reported-by: syzbot+53f8ce8bbc07924b6417@...kaller.appspotmail.com
Fixes: 4d004099a668 ("lockdep: Fix lockdep recursion")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection