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BUG: KASAN: slab-use-after-free in netdev_need_ops_lock include/net/netdev_lock.h:30 [inline]
BUG: KASAN: slab-use-after-free in netdev_unlock_ops include/net/netdev_lock.h:47 [inline]
BUG: KASAN: slab-use-after-free in __linkwatch_run_queue+0x658/0x8d4 net/core/link_watch.c:245
Read of size 1 at addr ebf0000018a62ca1 by task kworker/u4:10/5064
Pointer tag: [eb], memory tag: [fe]

CPU: 0 UID: 0 PID: 5064 Comm: kworker/u4:10 Not tainted syzkaller #0 PREEMPT 
Hardware name: linux,dummy-virt (DT)
Workqueue: events_unbound linkwatch_event
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xac/0x288 mm/kasan/report.c:378
 print_report+0x84/0xa0 mm/kasan/report.c:482
 kasan_report+0xb0/0x110 mm/kasan/report.c:595
 kasan_tag_mismatch+0x28/0x3c mm/kasan/sw_tags.c:175
 __hwasan_tag_mismatch+0x30/0x60 arch/arm64/lib/kasan_sw_tags.S:55
 netdev_need_ops_lock include/net/netdev_lock.h:30 [inline]
 netdev_unlock_ops include/net/netdev_lock.h:47 [inline]
 __linkwatch_run_queue+0x658/0x8d4 net/core/link_watch.c:245
 linkwatch_event+0x30/0x40 net/core/link_watch.c:304
 process_one_work+0x954/0x1a18 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0xb58/0x11b8 kernel/workqueue.c:3400
 kthread+0x794/0x9a0 kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844

Freed by task 7560:
 kasan_save_stack+0x40/0x6c mm/kasan/common.c:47
 save_stack_info+0x30/0x138 mm/kasan/tags.c:106
 kasan_save_free_info+0x18/0x24 mm/kasan/tags.c:147
 poison_slab_object mm/kasan/common.c:243 [inline]
 __kasan_slab_free+0x64/0x68 mm/kasan/common.c:275
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2417 [inline]
 slab_free mm/slub.c:4680 [inline]
 kfree+0x148/0x44c mm/slub.c:4879
 kvfree+0x30/0x40 mm/slub.c:5095
 netdev_release+0x9c/0xd0 net/core/net-sysfs.c:2250
 device_release+0xb8/0x2a4 drivers/base/core.c:-1
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x358/0x518 lib/kobject.c:737
 netdev_run_todo+0xe54/0xfd8 net/core/dev.c:11513
 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:157
 default_device_exit_batch+0xaf4/0xb74 net/core/dev.c:12734
 ops_exit_list net/core/net_namespace.c:204 [inline]
 ops_undo_list+0x544/0xa08 net/core/net_namespace.c:251
 cleanup_net+0x48c/0x868 net/core/net_namespace.c:682
 process_one_work+0x954/0x1a18 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0xb58/0x11b8 kernel/workqueue.c:3400
 kthread+0x794/0x9a0 kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844

The buggy address belongs to the object at fff0000018a62000
 which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 3233 bytes inside of
 4096-byte region [fff0000018a62000, fff0000018a63000)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xebf0000018a62000 pfn:0x58a60
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:edf000001dc0b681
flags: 0x1ffc00000000240(workingset|head|node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0)
page_type: f5(slab)
raw: 01ffc00000000240 28f000000cc09000 ffffc1ffc06f4a10 ffffc1ffc093e210
raw: ebf0000018a62000 0000000000080003 00000000f5000000 edf000001dc0b681
head: 01ffc00000000240 28f000000cc09000 ffffc1ffc06f4a10 ffffc1ffc093e210
head: ebf0000018a62000 0000000000080003 00000000f5000000 edf000001dc0b681
head: 01ffc00000000003 ffffc1ffc0629801 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 fff0000018a62a00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 fff0000018a62b00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>fff0000018a62c00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
                                                 ^
 fff0000018a62d00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 fff0000018a62e00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
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