linux-kernel - Re: [syzbot] [netfilter?] [usb?] INFO: rcu detected stall in NF

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Date: Thu, 20 Jun 2024 13:29:42 -0400
From: Alan Stern <stern@...land.harvard.edu>
To: syzbot <syzbot+696cffe71c444e4a2dd8@...kaller.appspotmail.com>
Cc: davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com,
  kadlec@...filter.org, kuba@...nel.org, linux-kernel@...r.kernel.org,
  linux-usb@...r.kernel.org, netdev@...r.kernel.org,
  netfilter-devel@...r.kernel.org, pabeni@...hat.com, pablo@...filter.org,
  syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [netfilter?] [usb?] INFO: rcu detected stall in NF_HOOK

On Thu, Jun 20, 2024 at 10:13:24AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    2ccbdf43d5e7 Merge tag 'for-linus' of git://git.kernel.org..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=10341146980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=fa0ce06dcc735711
> dashboard link: https://syzkaller.appspot.com/bug?extid=696cffe71c444e4a2dd8
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13e8bfee980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12d3d851980000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/93525a95fe83/disk-2ccbdf43.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/b9b895227ea2/vmlinux-2ccbdf43.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/e825248a8e73/bzImage-2ccbdf43.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+696cffe71c444e4a2dd8@...kaller.appspotmail.com
> 
> rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { P45
>  1-....
>  } 2688 jiffies s: 1349 root: 0x2/T
> rcu: blocking rcu_node structures (internal RCU debug):
> 
> Sending NMI from CPU 0 to CPUs 1:
> cdc_wdm 3-1:1.0: wdm_int_callback - 0 bytes
> cdc_wdm 3-1:1.0: nonzero urb status received: -71
> cdc_wdm 3-1:1.0: wdm_int_callback - 0 bytes
> cdc_wdm 3-1:1.0: nonzero urb status received: -71

#syz dup: [syzbot] [usb?] INFO: rcu detected stall in raw_ioctl

Alan Stern