process_scheduled_works kernel/workqueue.c:3397 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 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#3: kworker/u32:0/12
Modules linked in:
CPU: 3 UID: 0 PID: 12 Comm: kworker/u32:0 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 96 bb f4 03 e8 c1 84 d0 00 48 8b 34 24 48 89 ef e8 65 ea 51 0a 90 <0f> 0b 90 bb ea ff ff ff e9 b0 e5 f4 03 4c 89 f7 e8 af 70 3d 01 e9
RSP: 0018:ffffc900001e7880 EFLAGS: 00010202
RAX: 0000000000000201 RBX: ffff888057c44980 RCX: 0000000000000000
RDX: 0000000000000202 RSI: ffffffff8df19940 RDI: 0000000000000001
RBP: ffff888021e4c658 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 1ffff9200003cf12
R13: ffffc900001e78b0 R14: ffff888057c44998 R15: 00000000028805a6
FS:  0000000000000000(0000) GS:ffff88809748d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000800002c0 CR3: 000000007962d000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 netdev_tracker_free include/linux/netdevice.h:4491 [inline]
 netdev_put include/linux/netdevice.h:4508 [inline]
 netdev_put include/linux/netdevice.h:4504 [inline]
 netdev_watchdog_down net/sched/sch_generic.c:600 [inline]
 dev_deactivate_many+0x293/0xff0 net/sched/sch_generic.c:1363
 dev_deactivate+0x109/0x1d0 net/sched/sch_generic.c:1397
 linkwatch_do_dev net/core/link_watch.c:184 [inline]
 linkwatch_do_dev+0xd3/0x120 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+0xa0e/0x1980 kernel/workqueue.c:3314
 process_scheduled_works kernel/workqueue.c:3397 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>