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

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Date:   Sun, 31 Jul 2022 03:09:16 -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

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=cad/1/0x4000000000000000 softirq=7023/7025 fqs=2 
	(detected by 1, t=10502 jiffies, g=7257, q=133)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4073 Comm: syz-executor.0 Not tainted 5.17.0-rc6-next-20220303-syzkaller-dirty #0
Harclient_loop: send disconnect: Broken pipe


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=166fe82e080000
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=15c240c1080000