linux-kernel - Re: [syzbot] INFO: rcu detected stall in gc

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Message-ID: <000000000000390a4c05dab07752@google.com>
Date:   Sun, 20 Mar 2022 18:32:12 -0700
From:   syzbot <syzbot+eec403943a2a2455adaa@...kaller.appspotmail.com>
To:     hdanton@...a.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] INFO: rcu detected stall in gc_worker (3)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
INFO: rcu detected stall in corrupted

IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 2628 jiffies s: 2065 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Task dump for CPU 0:
task:syz-executor354 state:R  running task     stack:27224 pid: 4078 ppid:  4061 flags:0x0000400e
Call Trace:
 <TASK>
 </TASK>

Tested on:

commit:         91265a6d Add linux-next specific files for 20220303
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/
console output: https://syzkaller.appspot.com/x/log.txt?x=16355271700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=617f79440a35673a
dashboard link: https://syzkaller.appspot.com/bug?extid=eec403943a2a2455adaa
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=17b1f271700000