linux-kernel - [syzbot] [netfilter?] net-next test error: WARNING: suspicious RCU usage in corrupted

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Date: Tue, 18 Jun 2024 17:11:20 -0700
From: syzbot <syzbot+6c048081aec46ad4ddf5@...kaller.appspotmail.com>
To: coreteam@...filter.org, davem@...emloft.net, edumazet@...gle.com, 
	kadlec@...filter.org, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org, pabeni@...hat.com, 
	pablo@...filter.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [netfilter?] net-next test error: WARNING: suspicious RCU
 usage in corrupted

Hello,

syzbot found the following issue on:

HEAD commit:    4314175af496 Merge branch 'net-smc-IPPROTO_SMC'
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14f4852e980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7266aeba025a54a4
dashboard link: https://syzkaller.appspot.com/bug?extid=6c048081aec46ad4ddf5
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/48b3722e2009/disk-4314175a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2297abec79e7/vmlinux-4314175a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1e99b4419b68/bzImage-4314175a.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6c048081aec46ad4ddf5@...kaller.appspotmail.com

=============================
WARNING: suspicious RCU usage
6.10.0-rc3-syzkaller-00696-g4314175af496 #0 Not tainted
-----------------------------
net/netfilter/ipset/ip_set_core.c:1200 suspicious rcu_dereference_protected() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
3 locks held by kworker/u8:3/51:
 #0: ffff888015edd948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
 #0: ffff888015edd948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
 #1: ffffc90000bb7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
 #1: ffffc90000bb7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
 #2: ffffffff8f5db650 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:594

stack backtrace:
CPU: 0 PID: 51 Comm


---
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