syzbot


WARNING in ops_undo_list

Status: upstream: reported on 2026/02/18 12:26
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+5a287bcdc08104bc3132@syzkaller.appspotmail.com
First crash: 4d21h, last: 4d21h
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [net?] WARNING in ops_undo_list 0 (1) 2026/02/18 12:26

Sample crash report:
ip6erspan0 (unregistering): left allmulticast mode
bond7 (unregistering): (slave ip6gretap1): Releasing active interface
bond12 (unregistering): (slave geneve2): Releasing active interface
bond0 (unregistering): Released all slaves
bond1 (unregistering): Error: No native XDP support for the current bonding mode
------------[ cut here ]------------
dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL)
WARNING: net/core/dev.c:10361 at dev_xdp_uninstall net/core/dev.c:10361 [inline], CPU#0: kworker/u8:22/11031
WARNING: net/core/dev.c:10361 at unregister_netdevice_many_notify+0x1efd/0x2370 net/core/dev.c:12393, CPU#0: kworker/u8:22/11031
Modules linked in:
CPU: 0 UID: 0 PID: 11031 Comm: kworker/u8:22 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: netns cleanup_net
RIP: 0010:dev_xdp_uninstall net/core/dev.c:10361 [inline]
RIP: 0010:unregister_netdevice_many_notify+0x1efd/0x2370 net/core/dev.c:12393
Code: 0f b9 3a e9 00 ff ff ff e8 50 51 52 f8 90 0f 0b 90 e9 1d ff ff ff e8 42 51 52 f8 90 0f 0b 90 e9 a0 f3 ff ff e8 34 51 52 f8 90 <0f> 0b 90 e9 f1 f4 ff ff e8 26 51 52 f8 90 0f 0b 90 e9 4e f6 ff ff
RSP: 0018:ffffc90003b2f7c0 EFLAGS: 00010293
RAX: ffffffff8971e99c RBX: ffff888052f84c40 RCX: ffff88807896bc80
RDX: 0000000000000000 RSI: 00000000ffffffa1 RDI: 0000000000000000
RBP: ffffc90003b2f930 R08: ffffc90003b2f207 R09: 1ffff92000765e40
R10: dffffc0000000000 R11: fffff52000765e41 R12: 00000000ffffffa1
R13: ffff888052f84c38 R14: 1ffff1100a5f0988 R15: ffffc9000df67000
FS:  0000000000000000(0000) GS:ffff8881254ae000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f60871d5d58 CR3: 000000006c41c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]
 ops_undo_list+0x3d3/0x940 net/core/net_namespace.c:248
 cleanup_net+0x56b/0x800 net/core/net_namespace.c:704
 process_one_work kernel/workqueue.c:3275 [inline]
 process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3358
 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/17 21:00 net 77c5e3fdd279 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in ops_undo_list
* Struck through repros no longer work on HEAD.