process_scheduled_works kernel/workqueue.c:3358 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
 kthread+0x370/0x450 kernel/kthread.c:467
 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
------------[ cut here ]------------
1
WARNING: lib/ref_tracker.c:322 at ref_tracker_free.cold+0x116/0x154 lib/ref_tracker.c:322, CPU#2: kworker/u32:15/6629
Modules linked in:
CPU: 2 UID: 0 PID: 6629 Comm: kworker/u32:15 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events_unbound linkwatch_event
RIP: 0010:ref_tracker_free.cold+0x116/0x154 lib/ref_tracker.c:322
Code: 48 c1 e0 2a 0f b6 04 02 84 c0 74 04 3c 03 7e 4e 8b 7b 18 e8 e0 85 f0 03 e8 2b ae d0 00 48 8b 34 24 48 89 ef e8 6f be 58 0a 90 <0f> 0b 90 bb ea ff ff ff e9 fa af f0 03 4c 89 f7 e8 d9 32 3c 01 e9
RSP: 0000:ffffc90030347898 EFLAGS: 00010202
RAX: 0000000000000201 RBX: ffff88802a487940 RCX: 0000000000000000
RDX: 0000000000000202 RSI: ffffffff8de7b970 RDI: 0000000000000001
RBP: ffff888029174620 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 1ffff92006068f15
R13: ffffc900303478c8 R14: ffff88802a487958 R15: 0000000007c40496
FS:  0000000000000000(0000) GS:ffff88809734e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f545aff4 CR3: 00000000792f1000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 netdev_tracker_free include/linux/netdevice.h:4423 [inline]
 netdev_put include/linux/netdevice.h:4440 [inline]
 netdev_put include/linux/netdevice.h:4436 [inline]
 netdev_watchdog_down net/sched/sch_generic.c:575 [inline]
 dev_deactivate_many+0x28f/0xc50 net/sched/sch_generic.c:1364
 dev_deactivate+0xf8/0x1c0 net/sched/sch_generic.c:1395
 linkwatch_do_dev net/core/link_watch.c:184 [inline]
 linkwatch_do_dev+0xce/0x110 net/core/link_watch.c:166
 __linkwatch_run_queue+0x3a9/0x900 net/core/link_watch.c:240
 linkwatch_event+0x8f/0xc0 net/core/link_watch.c:314
 process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275
 process_scheduled_works kernel/workqueue.c:3358 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
 kthread+0x370/0x450 kernel/kthread.c:467
 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>