kobject: kobject_add_internal failed for hci1:201 with -EEXIST, don't try to register things with the same name in the same directory. Bluetooth: hci1: failed to register connection device ================================================================== BUG: KASAN: slab-use-after-free in l2cap_sock_ready_cb+0xc4/0x15c net/bluetooth/l2cap_sock.c:1687 Read of size 8 at addr ffff0000c8644188 by task kworker/u9:5/6578 CPU: 1 UID: 0 PID: 6578 Comm: kworker/u9:5 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Workqueue: hci1 hci_rx_work Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xa8/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0xb0/0x110 mm/kasan/report.c:595 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 l2cap_sock_ready_cb+0xc4/0x15c net/bluetooth/l2cap_sock.c:1687 l2cap_chan_ready net/bluetooth/l2cap_core.c:1264 [inline] l2cap_le_start+0x950/0x10c0 net/bluetooth/l2cap_core.c:1376 l2cap_conn_ready net/bluetooth/l2cap_core.c:1629 [inline] l2cap_connect_cfm+0x558/0xdb0 net/bluetooth/l2cap_core.c:7305 hci_connect_cfm+0x98/0x134 include/net/bluetooth/hci_core.h:2131 le_conn_complete_evt+0xc3c/0x1064 net/bluetooth/hci_event.c:5821 hci_le_conn_complete_evt+0x114/0x410 net/bluetooth/hci_event.c:5847 hci_le_meta_evt+0x2dc/0x500 net/bluetooth/hci_event.c:7408 hci_event_func net/bluetooth/hci_event.c:7716 [inline] hci_event_packet+0x6bc/0xf50 net/bluetooth/hci_event.c:7773 hci_rx_work+0x300/0xd80 net/bluetooth/hci_core.c:4076 process_one_work+0x7c0/0x1558 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3421 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Allocated by task 8640: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:77 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:397 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:414 kasan_kmalloc include/linux/kasan.h:262 [inline] __do_kmalloc_node mm/slub.c:5657 [inline] __kmalloc_noprof+0x410/0x764 mm/slub.c:5669 kmalloc_noprof include/linux/slab.h:961 [inline] sk_prot_alloc+0xc4/0x1f0 net/core/sock.c:2245 sk_alloc+0x44/0x3a0 net/core/sock.c:2301 bt_sock_alloc+0x4c/0x300 net/bluetooth/af_bluetooth.c:151 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1897 [inline] l2cap_sock_create+0x140/0x2f4 net/bluetooth/l2cap_sock.c:1939 bt_sock_create+0x14c/0x24c net/bluetooth/af_bluetooth.c:135 __sock_create+0x43c/0x910 net/socket.c:1605 sock_create net/socket.c:1663 [inline] __sys_socket_create net/socket.c:1700 [inline] __sys_socket+0xd4/0x1c0 net/socket.c:1747 __do_sys_socket net/socket.c:1761 [inline] __se_sys_socket net/socket.c:1759 [inline] __arm64_sys_socket+0x7c/0x94 net/socket.c:1759 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Freed by task 8640: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:77 kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6668 [inline] kfree+0x1c4/0x5fc mm/slub.c:6876 sk_prot_free net/core/sock.c:2284 [inline] __sk_destruct+0x5fc/0x924 net/core/sock.c:2384 sk_destruct net/core/sock.c:2412 [inline] __sk_free+0x320/0x430 net/core/sock.c:2423 sk_free+0x60/0xc8 net/core/sock.c:2434 sock_put include/net/sock.h:1998 [inline] l2cap_sock_kill+0x12c/0x25c net/bluetooth/l2cap_sock.c:1265 l2cap_sock_release+0x15c/0x1fc net/bluetooth/l2cap_sock.c:1438 __sock_release net/socket.c:662 [inline] sock_close+0xa0/0x1e4 net/socket.c:1455 __fput+0x340/0x75c fs/file_table.c:468 ____fput+0x20/0x58 fs/file_table.c:496 task_work_run+0x1dc/0x260 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:44 [inline] exit_to_user_mode_loop+0x10c/0x18c kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] exit_to_user_mode_prepare_legacy include/linux/irq-entry-common.h:242 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline] el0_svc+0x17c/0x26c arch/arm64/kernel/entry-common.c:725 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 The buggy address belongs to the object at ffff0000c8644000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 392 bytes inside of freed 2048-byte region [ffff0000c8644000, ffff0000c8644800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x108640 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c0002000 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0002000 dead000000000100 dead000000000122 head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc3219001 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c8644080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c8644100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000c8644180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c8644200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c8644280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Bluetooth: hci0: command tx timeout Bluetooth: hci2: command tx timeout Bluetooth: hci0: command tx timeout Bluetooth: hci2: command tx timeout Bluetooth: hci0: command tx timeout Bluetooth: hci0: command tx timeout