 </TASK>
kobject: kobject_add_internal failed for hci0:201 with -EEXIST, don't try to register things with the same name in the same directory.
Bluetooth: hci0: failed to register connection device
==================================================================
BUG: KASAN: slab-use-after-free in l2cap_conn_ready net/bluetooth/l2cap_core.c:1639 [inline]
BUG: KASAN: slab-use-after-free in l2cap_connect_cfm+0xde7/0xf80 net/bluetooth/l2cap_core.c:7419
Read of size 8 at addr ffff888051161480 by task kworker/u9:2/5631

CPU: 1 UID: 0 PID: 5631 Comm: kworker/u9:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: hci0 hci_rx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1d0 mm/kasan/report.c:595
 l2cap_conn_ready net/bluetooth/l2cap_core.c:1639 [inline]
 l2cap_connect_cfm+0xde7/0xf80 net/bluetooth/l2cap_core.c:7419
 hci_connect_cfm include/net/bluetooth/hci_core.h:2139 [inline]
 le_conn_complete_evt+0x197c/0x1f60 net/bluetooth/hci_event.c:5865
 hci_le_conn_complete_evt+0x23c/0x3a0 net/bluetooth/hci_event.c:5891
 hci_le_meta_evt+0x34a/0x5f0 net/bluetooth/hci_event.c:7529
 hci_event_func net/bluetooth/hci_event.c:7793 [inline]
 hci_event_packet+0x51c/0xcd0 net/bluetooth/hci_event.c:7847
 hci_rx_work+0x451/0xfc0 net/bluetooth/hci_core.c:4077
 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302
 process_scheduled_works kernel/workqueue.c:3385 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 5631:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
 kmalloc_noprof include/linux/slab.h:950 [inline]
 kzalloc_noprof include/linux/slab.h:1188 [inline]
 l2cap_chan_create+0x44/0x940 net/bluetooth/l2cap_core.c:445
 l2cap_sock_alloc.constprop.0+0xf5/0x1e0 net/bluetooth/l2cap_sock.c:1943
 l2cap_sock_new_connection_cb+0x10f/0x260 net/bluetooth/l2cap_sock.c:1513
 l2cap_connect_cfm+0x4e2/0xf80 net/bluetooth/l2cap_core.c:7402
 hci_connect_cfm include/net/bluetooth/hci_core.h:2139 [inline]
 le_conn_complete_evt+0x197c/0x1f60 net/bluetooth/hci_event.c:5865
 hci_le_conn_complete_evt+0x23c/0x3a0 net/bluetooth/hci_event.c:5891
 hci_le_meta_evt+0x34a/0x5f0 net/bluetooth/hci_event.c:7529
 hci_event_func net/bluetooth/hci_event.c:7793 [inline]
 hci_event_packet+0x51c/0xcd0 net/bluetooth/hci_event.c:7847
 hci_rx_work+0x451/0xfc0 net/bluetooth/hci_core.c:4077
 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302
 process_scheduled_works kernel/workqueue.c:3385 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Freed by task 7881:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2689 [inline]
 slab_free mm/slub.c:6250 [inline]
 kfree+0x223/0x6c0 mm/slub.c:6565
 l2cap_chan_destroy net/bluetooth/l2cap_core.c:491 [inline]
 kref_put include/linux/kref.h:65 [inline]
 l2cap_chan_put+0x235/0x300 net/bluetooth/l2cap_core.c:516
 l2cap_sock_cleanup_listen+0x4d/0x2d0 net/bluetooth/l2cap_sock.c:1493
 l2cap_sock_release+0x69/0x280 net/bluetooth/l2cap_sock.c:1451
 __sock_release+0xb3/0x260 net/socket.c:722
 sock_close+0x1c/0x30 net/socket.c:1514
 __fput+0x3ff/0xb50 fs/file_table.c:510
 task_work_run+0x150/0x240 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0x107/0x4f0 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x706/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888051161000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1152 bytes inside of
 freed 2048-byte region [ffff888051161000, ffff888051161800)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888051162000 pfn:0x51160
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88813fe34000 ffff88813fe2e948 ffff88813fe2e948
raw: ffff888051162000 0000000800080002 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88813fe34000 ffff88813fe2e948 ffff88813fe2e948
head: ffff888051162000 0000000800080002 00000000f5000000 0000000000000000
head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5631, tgid 5631 (kworker/u9:2), ts 219538619016, free_ts 216286689757
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x153/0x170 mm/page_alloc.c:1858
 prep_new_page mm/page_alloc.c:1866 [inline]
 get_page_from_freelist+0x11a6/0x33b0 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x27c/0x2bc0 mm/page_alloc.c:5226
 alloc_slab_page mm/slub.c:3278 [inline]
 allocate_slab mm/slub.c:3467 [inline]
 new_slab+0xa6/0x6c0 mm/slub.c:3525
 refill_objects+0x277/0x420 mm/slub.c:7255
 refill_sheaf mm/slub.c:2816 [inline]
 __pcs_replace_empty_main+0x375/0x650 mm/slub.c:4651
 alloc_from_pcs mm/slub.c:4749 [inline]
 slab_alloc_node mm/slub.c:4883 [inline]
 __kmalloc_cache_noprof+0x493/0x6f0 mm/slub.c:5414
 kmalloc_noprof include/linux/slab.h:950 [inline]
 kzalloc_noprof include/linux/slab.h:1188 [inline]
 l2cap_chan_create+0x44/0x940 net/bluetooth/l2cap_core.c:445
 l2cap_sock_alloc.constprop.0+0xf5/0x1e0 net/bluetooth/l2cap_sock.c:1943
 l2cap_sock_new_connection_cb+0x10f/0x260 net/bluetooth/l2cap_sock.c:1513
 l2cap_connect_cfm+0x4e2/0xf80 net/bluetooth/l2cap_core.c:7402
 hci_connect_cfm include/net/bluetooth/hci_core.h:2139 [inline]
 le_conn_complete_evt+0x197c/0x1f60 net/bluetooth/hci_event.c:5865
 hci_le_conn_complete_evt+0x23c/0x3a0 net/bluetooth/hci_event.c:5891
 hci_le_meta_evt+0x34a/0x5f0 net/bluetooth/hci_event.c:7529
 hci_event_func net/bluetooth/hci_event.c:7793 [inline]
 hci_event_packet+0x51c/0xcd0 net/bluetooth/hci_event.c:7847
 hci_rx_work+0x451/0xfc0 net/bluetooth/hci_core.c:4077
page last free pid 6874 tgid 6874 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1402 [inline]
 __free_frozen_pages+0x747/0x1040 mm/page_alloc.c:2943
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4569 [inline]
 slab_alloc_node mm/slub.c:4898 [inline]
 kmem_cache_alloc_noprof+0x241/0x6e0 mm/slub.c:4905
 alloc_filename fs/namei.c:142 [inline]
 do_getname+0x35/0x390 fs/namei.c:182
 getname include/linux/fs.h:2526 [inline]
 class_filename_constructor include/linux/fs.h:2553 [inline]
 do_sys_openat2+0xc5/0x1e0 fs/open.c:1363
 do_sys_open fs/open.c:1370 [inline]
 __do_sys_openat fs/open.c:1386 [inline]
 __se_sys_openat fs/open.c:1381 [inline]
 __x64_sys_openat+0x12d/0x210 fs/open.c:1381
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888051161380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888051161400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888051161480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888051161500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888051161580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
==================================================================
BUG: KASAN: wild-memory-access in instrument_atomic_read include/linux/instrumented.h:82 [inline]
BUG: KASAN: wild-memory-access in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
BUG: KASAN: wild-memory-access in l2cap_chan_lock include/net/bluetooth/l2cap.h:829 [inline]
BUG: KASAN: wild-memory-access in l2cap_conn_ready net/bluetooth/l2cap_core.c:1641 [inline]
BUG: KASAN: wild-memory-access in l2cap_connect_cfm+0x7c0/0xf80 net/bluetooth/l2cap_core.c:7419
Read of size 4 at addr deacfffffffffc8c by task kworker/u9:2/5631

CPU: 1 UID: 0 PID: 5631 Comm: kworker/u9:2 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: hci0 hci_rx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 kasan_report+0xdf/0x1d0 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:186 [inline]
 kasan_check_range+0x10f/0x1e0 mm/kasan/generic.c:200
 instrument_atomic_read include/linux/instrumented.h:82 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
 l2cap_chan_lock include/net/bluetooth/l2cap.h:829 [inline]
 l2cap_conn_ready net/bluetooth/l2cap_core.c:1641 [inline]
 l2cap_connect_cfm+0x7c0/0xf80 net/bluetooth/l2cap_core.c:7419
 hci_connect_cfm include/net/bluetooth/hci_core.h:2139 [inline]
 le_conn_complete_evt+0x197c/0x1f60 net/bluetooth/hci_event.c:5865
 hci_le_conn_complete_evt+0x23c/0x3a0 net/bluetooth/hci_event.c:5891
 hci_le_meta_evt+0x34a/0x5f0 net/bluetooth/hci_event.c:7529
 hci_event_func net/bluetooth/hci_event.c:7793 [inline]
 hci_event_packet+0x51c/0xcd0 net/bluetooth/hci_event.c:7847
 hci_rx_work+0x451/0xfc0 net/bluetooth/hci_core.c:4077
 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302
 process_scheduled_works kernel/workqueue.c:3385 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
==================================================================
Oops: general protection fault, probably for non-canonical address 0xfbd59bffffffff91: 0000 [#1] SMP KASAN NOPTI
KASAN: maybe wild-memory-access in range [0xdeacfffffffffc88-0xdeacfffffffffc8f]
CPU: 1 UID: 0 PID: 5631 Comm: kworker/u9:2 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: hci0 hci_rx_work
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]
RIP: 0010:l2cap_chan_lock include/net/bluetooth/l2cap.h:829 [inline]
RIP: 0010:l2cap_conn_ready net/bluetooth/l2cap_core.c:1641 [inline]
RIP: 0010:l2cap_connect_cfm+0x7c7/0xf80 net/bluetooth/l2cap_core.c:7419
Code: 80 fb ff ff 49 39 c7 0f 84 29 01 00 00 e8 b1 65 7b f7 49 8d 6e 0c be 04 00 00 00 48 89 ef e8 50 36 e8 f7 48 89 e8 48 c1 e8 03 <0f> b6 14 18 48 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 f5
RSP: 0018:ffffc90003a1f830 EFLAGS: 00010213
RAX: 1bd59fffffffff91 RBX: dffffc0000000000 RCX: ffffc9001f497000
RDX: 0000000000000000 RSI: ffffffff81c64dfd RDI: ffff888035bdbd80
RBP: deacfffffffffc8c R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 3d3d3d3d3d3d3d3d R12: ffff88807711803d
R13: 0000000000000080 R14: deacfffffffffc80 R15: ffff88807bd53a88
FS:  0000000000000000(0000) GS:ffff888124471000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe32848f9c CR3: 000000002a742000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 hci_connect_cfm include/net/bluetooth/hci_core.h:2139 [inline]
 le_conn_complete_evt+0x197c/0x1f60 net/bluetooth/hci_event.c:5865
 hci_le_conn_complete_evt+0x23c/0x3a0 net/bluetooth/hci_event.c:5891
 hci_le_meta_evt+0x34a/0x5f0 net/bluetooth/hci_event.c:7529
 hci_event_func net/bluetooth/hci_event.c:7793 [inline]
 hci_event_packet+0x51c/0xcd0 net/bluetooth/hci_event.c:7847
 hci_rx_work+0x451/0xfc0 net/bluetooth/hci_core.c:4077
 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302
 process_scheduled_works kernel/workqueue.c:3385 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]
RIP: 0010:l2cap_chan_lock include/net/bluetooth/l2cap.h:829 [inline]
RIP: 0010:l2cap_conn_ready net/bluetooth/l2cap_core.c:1641 [inline]
RIP: 0010:l2cap_connect_cfm+0x7c7/0xf80 net/bluetooth/l2cap_core.c:7419
Code: 80 fb ff ff 49 39 c7 0f 84 29 01 00 00 e8 b1 65 7b f7 49 8d 6e 0c be 04 00 00 00 48 89 ef e8 50 36 e8 f7 48 89 e8 48 c1 e8 03 <0f> b6 14 18 48 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 f5
RSP: 0018:ffffc90003a1f830 EFLAGS: 00010213
RAX: 1bd59fffffffff91 RBX: dffffc0000000000 RCX: ffffc9001f497000
RDX: 0000000000000000 RSI: ffffffff81c64dfd RDI: ffff888035bdbd80
RBP: deacfffffffffc8c R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 3d3d3d3d3d3d3d3d R12: ffff88807711803d
R13: 0000000000000080 R14: deacfffffffffc80 R15: ffff88807bd53a88
FS:  0000000000000000(0000) GS:ffff888124471000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe32848f9c CR3: 00000000779ea000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess), 4 bytes skipped:
   0:	49 39 c7             	cmp    %rax,%r15
   3:	0f 84 29 01 00 00    	je     0x132
   9:	e8 b1 65 7b f7       	call   0xf77b65bf
   e:	49 8d 6e 0c          	lea    0xc(%r14),%rbp
  12:	be 04 00 00 00       	mov    $0x4,%esi
  17:	48 89 ef             	mov    %rbp,%rdi
  1a:	e8 50 36 e8 f7       	call   0xf7e8366f
  1f:	48 89 e8             	mov    %rbp,%rax
  22:	48 c1 e8 03          	shr    $0x3,%rax
* 26:	0f b6 14 18          	movzbl (%rax,%rbx,1),%edx <-- trapping instruction
  2a:	48 89 e8             	mov    %rbp,%rax
  2d:	83 e0 07             	and    $0x7,%eax
  30:	83 c0 03             	add    $0x3,%eax
  33:	38 d0                	cmp    %dl,%al
  35:	7c 08                	jl     0x3f
  37:	84 d2                	test   %dl,%dl
  39:	0f                   	.byte 0xf
  3a:	85 f5                	test   %esi,%ebp