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BUG: KASAN: slab-out-of-bounds in __lock_acquire+0x41d0/0x5640 kernel/locking/lockdep.c:4296
Read of size 8 at addr ffff88805e7990a0 by task kworker/1:6/8834

CPU: 1 PID: 8834 Comm: kworker/1:6 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events l2cap_chan_timeout
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x436 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 __lock_acquire+0x41d0/0x5640 kernel/locking/lockdep.c:4296
 lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:5005
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175
 spin_lock_bh include/linux/spinlock.h:359 [inline]
 lock_sock_nested+0x3b/0x110 net/core/sock.c:3040
 l2cap_sock_teardown_cb+0x88/0x400 net/bluetooth/l2cap_sock.c:1520
 l2cap_chan_del+0xad/0x1300 net/bluetooth/l2cap_core.c:618
 l2cap_chan_close+0x118/0xb10 net/bluetooth/l2cap_core.c:823
 l2cap_chan_timeout+0x173/0x450 net/bluetooth/l2cap_core.c:436
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Allocated by task 9187:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0xae/0x550 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1084 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:501 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:558 [inline]
 nsim_dev_trap_report_work+0x2b2/0xbe0 drivers/net/netdevsim/dev.c:599
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Freed by task 9187:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0xf5/0x140 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x103/0x2c0 mm/slab.c:3757
 skb_free_head net/core/skbuff.c:590 [inline]
 skb_release_data+0x6d9/0x910 net/core/skbuff.c:610
 skb_release_all net/core/skbuff.c:664 [inline]
 __kfree_skb net/core/skbuff.c:678 [inline]
 consume_skb net/core/skbuff.c:837 [inline]
 consume_skb+0xc2/0x160 net/core/skbuff.c:831
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:574 [inline]
 nsim_dev_trap_report_work+0x889/0xbe0 drivers/net/netdevsim/dev.c:599
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

The buggy address belongs to the object at ffff88805e798000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 160 bytes to the right of
 4096-byte region [ffff88805e798000, ffff88805e799000)
The buggy address belongs to the page:
page:ffffea000179e600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea000179e600 order:1 compound_mapcount:0
flags: 0xfffe0000010200(slab|head)
raw: 00fffe0000010200 ffffea000151bd88 ffffea0002a3ec08 ffff8880aa002000
raw: 0000000000000000 ffff88805e798000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88805e798f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88805e799000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805e799080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                               ^
 ffff88805e799100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805e799180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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