RBP: 0000000000000000 R08: 0000000020000848 R09: 0000000000000000
R10: 0000000000200fe0 R11: 0000000000000293 R12: 0000000000000043
R13: 0000000000000004 R14: 0000000000000004 R15: 0000000020000318
bridge0: port 3(ipvlan2) entered disabled state
==================================================================
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 ffff8880515a6b60 by task kworker/1:0/19

CPU: 1 PID: 19 Comm: kworker/1:0 Not tainted 4.19.147-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 14729:
 __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 3613:
 __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 ffff8880515a6b00
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 96 bytes inside of
 2048-byte region [ffff8880515a6b00, ffff8880515a7300)
The buggy address belongs to the page:
page:ffffea0001456980 count:1 mapcount:0 mapping:ffff88812c3f6c40 index:0x0 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffffea000244e188 ffffea00013b3588 ffff88812c3f6c40
raw: 0000000000000000 ffff8880515a6280 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880515a6a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880515a6a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880515a6b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff8880515a6b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880515a6c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
bridge0: port 3(ipvlan2) entered blocking state
bridge0: port 3(ipvlan2) entered disabled state
FAULT_INJECTION: forcing a failure.
name fail_page_alloc, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 16239 Comm: syz-executor.2 Tainted: G    B             4.19.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x22c/0x33e lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0xa/0x2f lib/fault-inject.c:149
 should_fail_alloc_page mm/page_alloc.c:3087 [inline]
 prepare_alloc_pages mm/page_alloc.c:4345 [inline]
 __alloc_pages_nodemask+0x256/0x2a60 mm/page_alloc.c:4392
 alloc_pages_vma+0xf2/0x800 mm/mempolicy.c:2161
 shmem_alloc_page+0x11c/0x1f0 mm/shmem.c:1494
 shmem_alloc_and_acct_page+0x15a/0x880 mm/shmem.c:1519
 shmem_getpage_gfp+0x4e9/0x3a70 mm/shmem.c:1797
 shmem_getpage mm/shmem.c:132 [inline]
 shmem_write_begin+0xff/0x1e0 mm/shmem.c:2436
 generic_perform_write+0x1f8/0x4d0 mm/filemap.c:3162
 __generic_file_write_iter+0x24b/0x610 mm/filemap.c:3287
 generic_file_write_iter+0x3f8/0x729 mm/filemap.c:3315
 call_write_iter include/linux/fs.h:1821 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x51b/0x770 fs/read_write.c:487
 vfs_write+0x1f3/0x540 fs/read_write.c:549
 ksys_pwrite64 fs/read_write.c:653 [inline]
 __do_sys_pwrite64 fs/read_write.c:663 [inline]
 __se_sys_pwrite64 fs/read_write.c:660 [inline]
 __x64_sys_pwrite64+0x1f7/0x250 fs/read_write.c:660
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x417b07
Code: 12 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 a1 18 00 00 c3 48 83 ec 08 e8 07 fa ff ff 48 89 04 24 49 89 ca b8 12 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 4d fa ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007f33b6d1ca20 EFLAGS: 00000293 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 0000000000417b07
RDX: 0000000000000020 RSI: 0000000020011500 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000020000848 R09: 0000000000000000
R10: 0000000000202000 R11: 0000000000000293 R12: 0000000000000043
R13: 0000000000000004 R14: 0000000000000004 R15: 00000000200003d8