netdev - [syzbot] [net?] WARNING in nsim_udp_tunnel_unset

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Message-ID: <6787c94e.050a0220.20d369.001a.GAE@google.com>
Date: Wed, 15 Jan 2025 06:42:22 -0800
From: syzbot <syzbot+a04efb7a2949bb2484cf@...kaller.appspotmail.com>
To: andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com, 
	kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
	pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] WARNING in nsim_udp_tunnel_unset_port

Hello,

syzbot found the following issue on:

HEAD commit:    bcde95ce32b6 Merge tag 'devicetree-fixes-for-6.13-1' of gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=118c58c4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c22efbd20f8da769
dashboard link: https://syzkaller.appspot.com/bug?extid=a04efb7a2949bb2484cf
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/002dc48f8ceb/disk-bcde95ce.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7d1bae2a9338/vmlinux-bcde95ce.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c0fb5cc8ac22/bzImage-bcde95ce.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a04efb7a2949bb2484cf@...kaller.appspotmail.com

------------[ cut here ]------------
entry not installed 17c10002 vs 0
WARNING: CPU: 0 PID: 1036 at drivers/net/netdevsim/udp_tunnels.c:58 nsim_udp_tunnel_unset_port+0x303/0x3f0 drivers/net/netdevsim/udp_tunnels.c:58
Modules linked in:
CPU: 0 UID: 0 PID: 1036 Comm: kworker/u8:14 Not tainted 6.13.0-rc3-syzkaller-00301-gbcde95ce32b6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: netns cleanup_net
RIP: 0010:nsim_udp_tunnel_unset_port+0x303/0x3f0 drivers/net/netdevsim/udp_tunnels.c:58
Code: 08 e8 01 b5 ca fa 90 49 83 fc 03 8b 4c 24 08 8b 44 24 10 0f 87 d8 00 00 00 89 ca 89 c6 48 c7 c7 20 7e 0a 8c e8 1e 7b 8b fa 90 <0f> 0b 90 90 41 bf fe ff ff ff e9 e0 fe ff ff 4c 89 f7 e8 36 24 2d
RSP: 0018:ffffc9000c7d7440 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffffc9000c7d7540 RCX: ffffffff815a1729
RDX: ffff88801ef7da00 RSI: ffffffff815a1736 RDI: 0000000000000001
RBP: ffff88804dea0000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: fffffffffffd8798 R12: 0000000000000000
R13: 0000000000000000 R14: ffffc9000c7d7544 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f712e7da180 CR3: 0000000032ca6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 udp_tunnel_nic_device_sync_one net/ipv4/udp_tunnel_nic.c:225 [inline]
 udp_tunnel_nic_device_sync_by_port net/ipv4/udp_tunnel_nic.c:246 [inline]
 __udp_tunnel_nic_device_sync.part.0+0x935/0xed0 net/ipv4/udp_tunnel_nic.c:289
 __udp_tunnel_nic_device_sync net/ipv4/udp_tunnel_nic.c:283 [inline]
 udp_tunnel_nic_flush+0x2af/0x5e0 net/ipv4/udp_tunnel_nic.c:670
 udp_tunnel_nic_unregister net/ipv4/udp_tunnel_nic.c:864 [inline]
 udp_tunnel_nic_netdevice_event+0x6a0/0x18e0 net/ipv4/udp_tunnel_nic.c:904
 notifier_call_chain+0xb7/0x410 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996
 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline]
 call_netdevice_notifiers net/core/dev.c:2048 [inline]
 unregister_netdevice_many_notify+0x8d5/0x1e60 net/core/dev.c:11526
 unregister_netdevice_many net/core/dev.c:11590 [inline]
 unregister_netdevice_queue+0x307/0x3f0 net/core/dev.c:11462
 unregister_netdevice include/linux/netdevice.h:3192 [inline]
 nsim_destroy+0x107/0x6b0 drivers/net/netdevsim/netdev.c:821
 __nsim_dev_port_del+0x189/0x240 drivers/net/netdevsim/dev.c:1428
 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1440 [inline]
 nsim_dev_reload_destroy+0x108/0x4d0 drivers/net/netdevsim/dev.c:1661
 nsim_dev_reload_down+0x6e/0xd0 drivers/net/netdevsim/dev.c:968
 devlink_reload+0x17f/0x760 net/devlink/dev.c:461
 devlink_pernet_pre_exit+0x1a1/0x2b0 net/devlink/core.c:509
 ops_pre_exit_list net/core/net_namespace.c:162 [inline]
 cleanup_net+0x488/0xbd0 net/core/net_namespace.c:628
 process_one_work+0x958/0x1b30 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>


---
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