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BUG: KASAN: use-after-free in __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
Read of size 8 at addr ffff88804ff175e0 by task kworker/1:0/19

CPU: 1 PID: 19 Comm: kworker/1:0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Workqueue: events l2cap_chan_timeout
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:168
 spin_lock_bh include/linux/spinlock.h:334 [inline]
 lock_sock_nested+0x3b/0x110 net/core/sock.c:2884
 l2cap_sock_teardown_cb+0xa0/0x6d0 net/bluetooth/l2cap_sock.c:1348
 l2cap_chan_del+0xbc/0xa50 net/bluetooth/l2cap_core.c:603
 l2cap_chan_close+0x1b5/0x950 net/bluetooth/l2cap_core.c:761
 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:430
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Allocated by task 34:
 __do_kmalloc_node mm/slab.c:3689 [inline]
 __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3703
 __kmalloc_reserve net/core/skbuff.c:137 [inline]
 __alloc_skb+0xae/0x560 net/core/skbuff.c:205
 skb_copy+0x139/0x2f0 net/core/skbuff.c:1358
 kauditd_send_multicast_skb+0x56/0x160 kernel/audit.c:806
 kauditd_send_queue+0x52/0x170 kernel/audit.c:737
 kauditd_thread+0x5c0/0x7a0 kernel/audit.c:868
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Freed by task 34:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 skb_free_head net/core/skbuff.c:563 [inline]
 pskb_expand_head+0x327/0xf20 net/core/skbuff.c:1506
 netlink_trim+0x200/0x250 net/netlink/af_netlink.c:1307
 netlink_broadcast_filtered+0x61/0xbc0 net/netlink/af_netlink.c:1504
 netlink_broadcast+0x35/0x40 net/netlink/af_netlink.c:1549
 nlmsg_multicast include/net/netlink.h:591 [inline]
 kauditd_send_multicast_skb+0x125/0x160 kernel/audit.c:812
 kauditd_send_queue+0x52/0x170 kernel/audit.c:737
 kauditd_thread+0x5c0/0x7a0 kernel/audit.c:868
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

The buggy address belongs to the object at ffff88804ff17540
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 160 bytes inside of
 2048-byte region [ffff88804ff17540, ffff88804ff17d40)
The buggy address belongs to the page:
page:ffffea00013fc580 count:1 mapcount:0 mapping:ffff88813bff0c40 index:0xffff88804ff16440 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffffea0001408e08 ffffea00023efb08 ffff88813bff0c40
raw: ffff88804ff16440 ffff88804ff16440 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88804ff17480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88804ff17500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff88804ff17580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff88804ff17600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88804ff17680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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