netdev - [syzbot] [netfilter?] upstream test error: WARNING: suspicious RCU usage in _destroy_all

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Date: Fri, 14 Jun 2024 01:20:17 -0700
From: syzbot <syzbot+b62c37cdd58103293a5a@...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?] upstream test error: WARNING: suspicious RCU
 usage in _destroy_all_sets

Hello,

syzbot found the following issue on:

HEAD commit:    d20f6b3d747c Merge tag 'net-6.10-rc4' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1720df36980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fa0ce06dcc735711
dashboard link: https://syzkaller.appspot.com/bug?extid=b62c37cdd58103293a5a
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/682e40151249/disk-d20f6b3d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5b5e6dd23e74/vmlinux-d20f6b3d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/08385974a61e/bzImage-d20f6b3d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b62c37cdd58103293a5a@...kaller.appspotmail.com

=============================
WARNING: suspicious RCU usage
6.10.0-rc3-syzkaller-00099-gd20f6b3d747c #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/u8:13/2892:
 #0: ffff888015ed5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
 #0: ffff888015ed5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
 #1: ffffc90009bcfd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
 #1: ffffc90009bcfd00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
 #2: ffffffff8f5db250 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:594

stack backtrace:
CPU: 1 PID: 2892 Comm: kworker/u8:13 Not tainted 6.10.0-rc3-syzkaller-00099-gd20f6b3d747c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 lockdep_rcu_suspicious+0x221/0x340 kernel/locking/lockdep.c:6712
 _destroy_all_sets+0x232/0x5f0 net/netfilter/ipset/ip_set_core.c:1200
 ip_set_net_exit+0x20/0x50 net/netfilter/ipset/ip_set_core.c:2396
 ops_exit_list net/core/net_namespace.c:173 [inline]
 cleanup_net+0x802/0xcc0 net/core/net_namespace.c:640
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>


---
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