8021q: adding VLAN 0 to HW filter on device team0
A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check.
syz-executor.2 (10551) used greatest stack depth: 23224 bytes left
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BUG: KASAN: use-after-free in constant_test_bit arch/x86/include/asm/bitops.h:317 [inline]
BUG: KASAN: use-after-free in sock_flag include/net/sock.h:839 [inline]
BUG: KASAN: use-after-free in l2cap_sock_kill+0xdb/0x100 net/bluetooth/l2cap_sock.c:1046
Read of size 8 at addr ffff88809a1651a0 by task kworker/0:4/7654

CPU: 0 PID: 7654 Comm: kworker/0:4 Not tainted 4.19.148-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+0x22c/0x33e lib/dump_stack.c:118
 print_address_description.cold+0x56/0x25c mm/kasan/report.c:256
 kasan_report_error.cold+0x66/0xb9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 constant_test_bit arch/x86/include/asm/bitops.h:317 [inline]
 sock_flag include/net/sock.h:839 [inline]
 l2cap_sock_kill+0xdb/0x100 net/bluetooth/l2cap_sock.c:1046
 l2cap_chan_timeout+0x1bb/0x210 net/bluetooth/l2cap_core.c:431
 process_one_work+0x796/0x14e0 kernel/workqueue.c:2155
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Allocated by task 9236:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15a/0x4f0 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 sk_prot_alloc+0x1e2/0x2d0 net/core/sock.c:1466
 sk_alloc+0x36/0x1100 net/core/sock.c:1520
 l2cap_sock_alloc.constprop.0+0x31/0x210 net/bluetooth/l2cap_sock.c:1590
 l2cap_sock_create+0x110/0x1b0 net/bluetooth/l2cap_sock.c:1636
 bt_sock_create+0x1d0/0x470 net/bluetooth/af_bluetooth.c:130
 __sock_create+0x495/0x820 net/socket.c:1276
 rfcomm_l2sock_create net/bluetooth/rfcomm/core.c:203 [inline]
 rfcomm_session_create net/bluetooth/rfcomm/core.c:738 [inline]
 __rfcomm_dlc_open net/bluetooth/rfcomm/core.c:388 [inline]
 rfcomm_dlc_open+0x6da/0xc50 net/bluetooth/rfcomm/core.c:431
 rfcomm_sock_connect+0x317/0x420 net/bluetooth/rfcomm/sock.c:416
 __sys_connect+0x265/0x2c0 net/socket.c:1663
 __do_sys_connect net/socket.c:1674 [inline]
 __se_sys_connect net/socket.c:1671 [inline]
 __x64_sys_connect+0x6f/0xb0 net/socket.c:1671
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 3609:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x250 mm/slab.c:3822
 sk_prot_free net/core/sock.c:1503 [inline]
 __sk_destruct+0x61d/0x830 net/core/sock.c:1584
 sk_destruct net/core/sock.c:1599 [inline]
 __sk_free+0x165/0x3b0 net/core/sock.c:1610
 sk_free+0x3b/0x50 net/core/sock.c:1621
 sock_put include/net/sock.h:1711 [inline]
 l2cap_sock_kill+0xd4/0x100 net/bluetooth/l2cap_sock.c:1055
 l2cap_sock_release+0xd9/0x100 net/bluetooth/l2cap_sock.c:1204
 __sock_release net/socket.c:579 [inline]
 sock_release+0x87/0x1d0 net/socket.c:599
 rfcomm_session_del+0x15a/0x1f0 net/bluetooth/rfcomm/core.c:684
 rfcomm_session_close net/bluetooth/rfcomm/core.c:723 [inline]
 rfcomm_process_rx net/bluetooth/rfcomm/core.c:1916 [inline]
 rfcomm_process_sessions net/bluetooth/rfcomm/core.c:2000 [inline]
 rfcomm_run+0x13c4/0x45d1 net/bluetooth/rfcomm/core.c:2087
 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 ffff88809a165140
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 96 bytes inside of
 2048-byte region [ffff88809a165140, ffff88809a165940)
The buggy address belongs to the page:
page:ffffea0002685900 count:1 mapcount:0 mapping:ffff88812c3f6c40 index:0x0 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffffea00026ae508 ffffea0001209308 ffff88812c3f6c40
raw: 0000000000000000 ffff88809a164040 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809a165080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88809a165100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff88809a165180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff88809a165200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809a165280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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