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_sock_new_connection_cb+0x1f9/0x2b0 net/bluetooth/l2cap_sock.c:1497 Read of size 8 at addr ffff8880206e8588 by task kworker/u9:4/5824 CPU: 0 UID: 0 PID: 5824 Comm: kworker/u9:4 Not tainted 6.15.0-syzkaller-02443-g015a99fa7665 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: hci0 hci_rx_work Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xd2/0x2b0 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 l2cap_sock_new_connection_cb+0x1f9/0x2b0 net/bluetooth/l2cap_sock.c:1497 l2cap_connect_cfm+0x37a/0x1040 net/bluetooth/l2cap_core.c:7263 hci_connect_cfm+0x92/0x140 include/net/bluetooth/hci_core.h:2053 le_conn_complete_evt+0xcd3/0x1220 net/bluetooth/hci_event.c:5790 hci_le_conn_complete_evt+0x187/0x450 net/bluetooth/hci_event.c:5816 hci_event_func net/bluetooth/hci_event.c:7494 [inline] hci_event_packet+0x7a2/0x1270 net/bluetooth/hci_event.c:7549 hci_rx_work+0x46a/0xe80 net/bluetooth/hci_core.c:4020 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 5824: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4339 kmalloc_noprof include/linux/slab.h:909 [inline] sk_prot_alloc+0xe7/0x220 net/core/sock.c:2208 sk_alloc+0x3a/0x370 net/core/sock.c:2264 bt_sock_alloc+0x3b/0x310 net/bluetooth/af_bluetooth.c:148 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1891 [inline] l2cap_sock_new_connection_cb+0xe2/0x2b0 net/bluetooth/l2cap_sock.c:1482 l2cap_connect_cfm+0x37a/0x1040 net/bluetooth/l2cap_core.c:7263 hci_connect_cfm+0x92/0x140 include/net/bluetooth/hci_core.h:2053 le_conn_complete_evt+0xcd3/0x1220 net/bluetooth/hci_event.c:5790 hci_le_conn_complete_evt+0x187/0x450 net/bluetooth/hci_event.c:5816 hci_event_func net/bluetooth/hci_event.c:7494 [inline] hci_event_packet+0x7a2/0x1270 net/bluetooth/hci_event.c:7549 hci_rx_work+0x46a/0xe80 net/bluetooth/hci_core.c:4020 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 7743: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2380 [inline] slab_free mm/slub.c:4642 [inline] kfree+0x18e/0x440 mm/slub.c:4841 sk_prot_free net/core/sock.c:2247 [inline] __sk_destruct+0x4e1/0x660 net/core/sock.c:2342 l2cap_sock_cleanup_listen+0xda/0x3e0 net/bluetooth/l2cap_sock.c:1462 l2cap_sock_release+0x5d/0x1d0 net/bluetooth/l2cap_sock.c:1425 __sock_release net/socket.c:647 [inline] sock_close+0xc0/0x240 net/socket.c:1391 __fput+0x44c/0xa70 fs/file_table.c:465 task_work_run+0x1d4/0x260 kernel/task_work.c:227 get_signal+0x11c5/0x1310 kernel/signal.c:2807 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880206e8000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1416 bytes inside of freed 2048-byte region [ffff8880206e8000, ffff8880206e8800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x206e8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801a042000 ffffea0000d5a600 dead000000000002 raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801a042000 ffffea0000d5a600 dead000000000002 head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea000081ba01 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 4008829871, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1714 prep_new_page mm/page_alloc.c:1722 [inline] get_page_from_freelist+0x21c7/0x22a0 mm/page_alloc.c:3684 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4974 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2450 [inline] allocate_slab+0x8a/0x3b0 mm/slub.c:2618 new_slab mm/slub.c:2672 [inline] ___slab_alloc+0xbfc/0x1480 mm/slub.c:3858 __slab_alloc mm/slub.c:3948 [inline] __slab_alloc_node mm/slub.c:4023 [inline] slab_alloc_node mm/slub.c:4184 [inline] __kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4353 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] acpi_ds_create_walk_state+0xd9/0x270 drivers/acpi/acpica/dswstate.c:518 acpi_ps_execute_method+0x220/0x7c0 drivers/acpi/acpica/psxface.c:134 acpi_ns_evaluate+0x5a6/0xa20 drivers/acpi/acpica/nseval.c:205 acpi_evaluate_object+0x53f/0xa10 drivers/acpi/acpica/nsxfeval.c:354 acpi_evaluate_integer+0xfc/0x270 drivers/acpi/utils.c:260 acpi_bus_get_status_handle drivers/acpi/bus.c:82 [inline] acpi_bus_get_status+0x14a/0x380 drivers/acpi/bus.c:111 acpi_bus_attach+0x232/0xbb0 drivers/acpi/scan.c:2277 device_for_each_child+0x100/0x190 drivers/base/core.c:4021 acpi_dev_for_each_child+0x93/0xd0 drivers/acpi/bus.c:1157 page_owner free stack trace missing Memory state around the buggy address: ffff8880206e8480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880206e8500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880206e8580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880206e8600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880206e8680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================