INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 3 PID: 6753 Comm: kbnepd bnep0 Not tainted 6.9.0-rc5-syzkaller-00031-g71b1543c83d6 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 assign_lock_key kernel/locking/lockdep.c:976 [inline]
 register_lock_class+0xc2a/0x1230 kernel/locking/lockdep.c:1289
 __lock_acquire+0x111/0x3b30 kernel/locking/lockdep.c:5014
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:170
 spin_lock_irq include/linux/spinlock.h:376 [inline]
 pm_runtime_set_memalloc_noio+0x50/0x180 drivers/base/power/runtime.c:228
 netdev_unregister_kobject+0x1ed/0x270 net/core/net-sysfs.c:2106
 unregister_netdevice_many_notify+0xc8a/0x19f0 net/core/dev.c:11135
 unregister_netdevice_many net/core/dev.c:11163 [inline]
 unregister_netdevice_queue+0x307/0x3f0 net/core/dev.c:11042
 unregister_netdevice include/linux/netdevice.h:3115 [inline]
 unregister_netdev+0x1c/0x30 net/core/dev.c:11181
 bnep_session+0x220d/0x2d60 net/bluetooth/bnep/core.c:525
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
==================================================================
BUG: KASAN: slab-use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
BUG: KASAN: slab-use-after-free in do_raw_spin_lock+0x271/0x2c0 kernel/locking/spinlock_debug.c:115
Read of size 4 at addr ffff888031a1d70c by task kbnepd bnep0/6753

CPU: 3 PID: 6753 Comm: kbnepd bnep0 Not tainted 6.9.0-rc5-syzkaller-00031-g71b1543c83d6 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:488
 kasan_report+0xd9/0x110 mm/kasan/report.c:601
 debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
 do_raw_spin_lock+0x271/0x2c0 kernel/locking/spinlock_debug.c:115
 spin_lock_irq include/linux/spinlock.h:376 [inline]
 pm_runtime_set_memalloc_noio+0x50/0x180 drivers/base/power/runtime.c:228
 netdev_unregister_kobject+0x1ed/0x270 net/core/net-sysfs.c:2106
 unregister_netdevice_many_notify+0xc8a/0x19f0 net/core/dev.c:11135
 unregister_netdevice_many net/core/dev.c:11163 [inline]
 unregister_netdevice_queue+0x307/0x3f0 net/core/dev.c:11042
 unregister_netdevice include/linux/netdevice.h:3115 [inline]
 unregister_netdev+0x1c/0x30 net/core/dev.c:11181
 bnep_session+0x220d/0x2d60 net/bluetooth/bnep/core.c:525
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 5698:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:312 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:338
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3798 [inline]
 slab_alloc_node mm/slub.c:3845 [inline]
 kmem_cache_alloc_node+0x177/0x340 mm/slub.c:3888
 kmalloc_reserve+0x18b/0x2c0 net/core/skbuff.c:577
 __alloc_skb+0x164/0x380 net/core/skbuff.c:668
 alloc_skb include/linux/skbuff.h:1313 [inline]
 netlink_alloc_large_skb+0x69/0x130 net/netlink/af_netlink.c:1210
 netlink_sendmsg+0x689/0xd70 net/netlink/af_netlink.c:1880
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0xab5/0xc90 net/socket.c:2584
 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2638
 __sys_sendmsg+0x117/0x1f0 net/socket.c:2667
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 4905:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
 poison_slab_object mm/kasan/common.c:240 [inline]
 __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2106 [inline]
 slab_free mm/slub.c:4280 [inline]
 kmem_cache_free+0x12e/0x380 mm/slub.c:4344
 skb_kfree_head net/core/skbuff.c:1094 [inline]
 skb_kfree_head net/core/skbuff.c:1091 [inline]
 skb_free_head+0x19a/0x1e0 net/core/skbuff.c:1108
 skb_release_data+0x76c/0x990 net/core/skbuff.c:1136
 skb_release_all net/core/skbuff.c:1202 [inline]
 __kfree_skb net/core/skbuff.c:1216 [inline]
 consume_skb net/core/skbuff.c:1432 [inline]
 consume_skb+0xd2/0x170 net/core/skbuff.c:1426
 netlink_recvmsg+0x606/0xf30 net/netlink/af_netlink.c:1983
 sock_recvmsg_nosec net/socket.c:1046 [inline]
 sock_recvmsg+0x1f6/0x250 net/socket.c:1068
 ____sys_recvmsg+0x21f/0x6b0 net/socket.c:2803
 ___sys_recvmsg+0x115/0x1a0 net/socket.c:2845
 __sys_recvmsg+0x114/0x1e0 net/socket.c:2875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888031a1d500
 which belongs to the cache skbuff_small_head of size 640
The buggy address is located 524 bytes inside of
 freed 640-byte region [ffff888031a1d500, ffff888031a1d780)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x31a1c
head: order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff80000000840(slab|head|node=0|zone=1|lastcpupid=0xfff)
page_type: 0xffffffff()
raw: 00fff80000000840 ffff888015f4aa00 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080150015 00000001ffffffff 0000000000000000
head: 00fff80000000840 ffff888015f4aa00 dead000000000122 0000000000000000
head: 0000000000000000 0000000080150015 00000001ffffffff 0000000000000000
head: 00fff80000000002 ffffea0000c68701 dead000000000122 00000000ffffffff
head: 0000000400000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5698, tgid 1409112600 (udevd), ts 5698, free_ts 143118719065
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534
 prep_new_page mm/page_alloc.c:1541 [inline]
 get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317
 __alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page mm/slub.c:2175 [inline]
 allocate_slab mm/slub.c:2338 [inline]
 new_slab+0xcc/0x3a0 mm/slub.c:2391
 ___slab_alloc+0x66d/0x1790 mm/slub.c:3525
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3610
 __slab_alloc_node mm/slub.c:3663 [inline]
 slab_alloc_node mm/slub.c:3835 [inline]
 kmem_cache_alloc_node+0x10a/0x340 mm/slub.c:3888
 kmalloc_reserve+0x18b/0x2c0 net/core/skbuff.c:577
 __alloc_skb+0x164/0x380 net/core/skbuff.c:668
 alloc_skb include/linux/skbuff.h:1313 [inline]
 netlink_alloc_large_skb+0x69/0x130 net/netlink/af_netlink.c:1210
 netlink_sendmsg+0x689/0xd70 net/netlink/af_netlink.c:1880
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0xab5/0xc90 net/socket.c:2584
 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2638
 __sys_sendmsg+0x117/0x1f0 net/socket.c:2667
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 7317 tgid 7317 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1141 [inline]
 free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2347
 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2487
 __folio_put_large+0x10d/0x1c0 mm/swap.c:132
 __folio_put+0x1c0/0x1f0 mm/swap.c:140
 hci_release_dev+0x525/0x660 net/bluetooth/hci_core.c:2833
 bt_host_release+0x6a/0xb0 net/bluetooth/hci_sysfs.c:94
 device_release+0xa1/0x240 drivers/base/core.c:2580
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1fa/0x5b0 lib/kobject.c:737
 put_device+0x1f/0x30 drivers/base/core.c:3828
 vhci_release+0x87/0x100 drivers/bluetooth/hci_vhci.c:675
 __fput+0x270/0xb80 fs/file_table.c:422
 task_work_run+0x14e/0x250 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa7d/0x2c10 kernel/exit.c:878
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1027
 get_signal+0x2616/0x2710 kernel/signal.c:2911
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310

Memory state around the buggy address:
 ffff888031a1d600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888031a1d680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888031a1d700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff888031a1d780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888031a1d800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================