==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: use-after-free in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:111 [inline]
BUG: KASAN: use-after-free in __refcount_add include/linux/refcount.h:193 [inline]
BUG: KASAN: use-after-free in __refcount_inc include/linux/refcount.h:250 [inline]
BUG: KASAN: use-after-free in refcount_inc include/linux/refcount.h:267 [inline]
BUG: KASAN: use-after-free in sock_hold include/net/sock.h:702 [inline]
BUG: KASAN: use-after-free in sco_conn_del+0xb5/0x2f0 net/bluetooth/sco.c:193
Write of size 4 at addr ffff8880211e7080 by task syz-executor.5/28670

CPU: 1 PID: 28670 Comm: syz-executor.5 Not tainted 5.15.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106
 print_address_description+0x66/0x3e0 mm/kasan/report.c:256
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report+0x19a/0x1f0 mm/kasan/report.c:459
 kasan_check_range+0x2b5/0x2f0 mm/kasan/generic.c:189
 instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
 atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:111 [inline]
 __refcount_add include/linux/refcount.h:193 [inline]
 __refcount_inc include/linux/refcount.h:250 [inline]
 refcount_inc include/linux/refcount.h:267 [inline]
 sock_hold include/net/sock.h:702 [inline]
 sco_conn_del+0xb5/0x2f0 net/bluetooth/sco.c:193
 hci_disconn_cfm include/net/bluetooth/hci_core.h:1518 [inline]
 hci_conn_hash_flush+0x112/0x240 net/bluetooth/hci_conn.c:1608
 hci_dev_do_close+0x93e/0xeb0 net/bluetooth/hci_core.c:1793
 hci_unregister_dev+0x2a2/0x510 net/bluetooth/hci_core.c:4029
 vhci_release+0x73/0xc0 drivers/bluetooth/hci_vhci.c:340
 __fput+0x3fe/0x870 fs/file_table.c:280
 task_work_run+0x146/0x1c0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0x6fc/0x2580 kernel/exit.c:825
 do_group_exit+0x168/0x2d0 kernel/exit.c:922
 get_signal+0x16e0/0x20c0 kernel/signal.c:2868
 arch_do_signal_or_restart+0x9c/0x730 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x191/0x220 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300
 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f1212a62709
Code: Unable to access opcode bytes at RIP 0x7f1212a626df.
RSP: 002b:00007f120ffd9218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f1212b66f68 RCX: 00007f1212a62709
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1212b66f68
RBP: 00007f1212b66f60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1212b66f6c
R13: 00007ffc379df42f R14: 00007f120ffd9300 R15: 0000000000022000

Allocated by task 30011:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:513
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 __kmalloc+0x24d/0x370 mm/slub.c:4391
 kmalloc include/linux/slab.h:596 [inline]
 sk_prot_alloc+0xf4/0x230 net/core/sock.c:1822
 sk_alloc+0x35/0x300 net/core/sock.c:1875
 sco_sock_alloc net/bluetooth/sco.c:491 [inline]
 sco_sock_create+0xb0/0x2f0 net/bluetooth/sco.c:526
 bt_sock_create+0x15b/0x220 net/bluetooth/af_bluetooth.c:130
 __sock_create+0x580/0x8d0 net/socket.c:1464
 sock_create net/socket.c:1515 [inline]
 __sys_socket+0x133/0x380 net/socket.c:1557
 __do_sys_socket net/socket.c:1566 [inline]
 __se_sys_socket net/socket.c:1564 [inline]
 __x64_sys_socket+0x76/0x80 net/socket.c:1564
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 28670:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:46
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
 ____kasan_slab_free+0x10d/0x150 mm/kasan/common.c:366
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1700 [inline]
 slab_free_freelist_hook+0x129/0x1a0 mm/slub.c:1725
 slab_free mm/slub.c:3483 [inline]
 kfree+0xcf/0x2f0 mm/slub.c:4543
 sk_prot_free net/core/sock.c:1858 [inline]
 __sk_destruct+0x575/0x820 net/core/sock.c:1943
 sock_put include/net/sock.h:1816 [inline]
 sco_conn_del+0x190/0x2f0 net/bluetooth/sco.c:198
 hci_disconn_cfm include/net/bluetooth/hci_core.h:1518 [inline]
 hci_conn_hash_flush+0x112/0x240 net/bluetooth/hci_conn.c:1608
 hci_dev_do_close+0x93e/0xeb0 net/bluetooth/hci_core.c:1793
 hci_unregister_dev+0x2a2/0x510 net/bluetooth/hci_core.c:4029
 vhci_release+0x73/0xc0 drivers/bluetooth/hci_vhci.c:340
 __fput+0x3fe/0x870 fs/file_table.c:280
 task_work_run+0x146/0x1c0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0x6fc/0x2580 kernel/exit.c:825
 do_group_exit+0x168/0x2d0 kernel/exit.c:922
 get_signal+0x16e0/0x20c0 kernel/signal.c:2868
 arch_do_signal_or_restart+0x9c/0x730 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x191/0x220 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300
 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff8880211e7000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 128 bytes inside of
 2048-byte region [ffff8880211e7000, ffff8880211e7800)
The buggy address belongs to the page:
page:ffffea0000847800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880211e5000 pfn:0x211e0
head:ffffea0000847800 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0000694e08 ffffea0002111e08 ffff888011042000
raw: ffff8880211e5000 0000000000080004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 26166, ts 892751847534, free_ts 892707798833
 prep_new_page mm/page_alloc.c:2424 [inline]
 get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4153
 __alloc_pages+0x255/0x580 mm/page_alloc.c:5375
 alloc_slab_page mm/slub.c:1763 [inline]
 allocate_slab+0xcc/0x4d0 mm/slub.c:1900
 new_slab mm/slub.c:1963 [inline]
 ___slab_alloc+0x41e/0xc40 mm/slub.c:2994
 __slab_alloc mm/slub.c:3081 [inline]
 slab_alloc_node mm/slub.c:3172 [inline]
 slab_alloc mm/slub.c:3214 [inline]
 __kmalloc+0x2e9/0x370 mm/slub.c:4387
 kmalloc include/linux/slab.h:596 [inline]
 sk_prot_alloc+0xf4/0x230 net/core/sock.c:1822
 sk_alloc+0x35/0x300 net/core/sock.c:1875
 __netlink_create+0x68/0x230 net/netlink/af_netlink.c:640
 netlink_create+0x368/0x4f0 net/netlink/af_netlink.c:703
 __sock_create+0x580/0x8d0 net/socket.c:1464
 sock_create net/socket.c:1515 [inline]
 __sys_socket+0x133/0x380 net/socket.c:1557
 __do_sys_socket net/socket.c:1566 [inline]
 __se_sys_socket net/socket.c:1564 [inline]
 __x64_sys_socket+0x76/0x80 net/socket.c:1564
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1338 [inline]
 free_pcp_prepare+0xc29/0xd20 mm/page_alloc.c:1389
 free_unref_page_prepare mm/page_alloc.c:3315 [inline]
 free_unref_page+0x7d/0x580 mm/page_alloc.c:3394
 free_slab mm/slub.c:2003 [inline]
 discard_slab mm/slub.c:2009 [inline]
 __unfreeze_partials+0x1ab/0x200 mm/slub.c:2495
 put_cpu_partial+0x132/0x1a0 mm/slub.c:2575
 do_slab_free mm/slub.c:3471 [inline]
 ___cache_free+0xe6/0x120 mm/slub.c:3490
 qlist_free_all mm/kasan/quarantine.c:165 [inline]
 kasan_quarantine_reduce+0x151/0x1c0 mm/kasan/quarantine.c:272
 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:444
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook mm/slab.h:519 [inline]
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3214 [inline]
 kmem_cache_alloc+0x1c3/0x300 mm/slub.c:3219
 sock_alloc_inode+0x17/0xb0 net/socket.c:303
 alloc_inode fs/inode.c:237 [inline]
 new_inode_pseudo+0x61/0x220 fs/inode.c:938
 sock_alloc net/socket.c:626 [inline]
 __sock_create+0x12b/0x8d0 net/socket.c:1428
 sock_create net/socket.c:1515 [inline]
 __sys_socket+0x133/0x380 net/socket.c:1557
 __do_sys_socket net/socket.c:1566 [inline]
 __se_sys_socket net/socket.c:1564 [inline]
 __x64_sys_socket+0x76/0x80 net/socket.c:1564
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Memory state around the buggy address:
 ffff8880211e6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880211e7000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880211e7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8880211e7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880211e7180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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