syzbot

 linkwatch_event+0x8f/0xc0 net/core/link_watch.c:304
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263
 process_scheduled_works kernel/workqueue.c:3346 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x56d/0x700 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4085 at lib/ref_tracker.c:323 ref_tracker_free+0x61a/0x830 lib/ref_tracker.c:323
Modules linked in:
CPU: 1 UID: 0 PID: 4085 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: events_unbound linkwatch_event
RIP: 0010:ref_tracker_free+0x61a/0x830 lib/ref_tracker.c:323
Code: 00 44 8b 73 18 31 ff 44 89 f6 e8 01 29 e1 fe 45 85 f6 0f 85 a6 00 00 00 e8 b3 2d e1 fe 48 8b 34 24 48 89 ef e8 e7 95 a9 04 90 <0f> 0b 90 bb ea ff ff ff e9 50 fd ff ff e8 94 2d e1 fe 4c 8d 6d 44
RSP: 0018:ffffc9000174f8a8 EFLAGS: 00010202
RAX: 0000000000000201 RBX: ffff888134bfe7c0 RCX: 0000000000000000
RDX: 0000000000000202 RSI: ffffffff88c86d07 RDI: 0000000000000001
RBP: ffff88810abbc5d0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8aa0cfd7 R11: 0000000000000001 R12: 1ffff920002e9f17
R13: ffffc9000174f8d8 R14: 0000000005ae0155 R15: ffff888134bfe7d8
FS:  0000000000000000(0000) GS:ffff888268fa3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fabecdc9000 CR3: 00000000090a4000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 netdev_tracker_free include/linux/netdevice.h:4395 [inline]
 netdev_put include/linux/netdevice.h:4412 [inline]
 netdev_put include/linux/netdevice.h:4408 [inline]
 netdev_watchdog_down net/sched/sch_generic.c:572 [inline]
 dev_deactivate_many+0x286/0xd30 net/sched/sch_generic.c:1370
 dev_deactivate+0xf8/0x1c0 net/sched/sch_generic.c:1401
 linkwatch_do_dev+0x11e/0x160 net/core/link_watch.c:184
 __linkwatch_run_queue+0x2a3/0x7a0 net/core/link_watch.c:244
 linkwatch_event+0x8f/0xc0 net/core/link_watch.c:304
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263
 process_scheduled_works kernel/workqueue.c:3346 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x56d/0x700 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>