</TASK>
kobject: kobject_add_internal failed for hci4:201 with -EEXIST, don't try to register things with the same name in the same directory.
Bluetooth: hci4: failed to register connection device
==================================================================
BUG: KASAN: slab-use-after-free in l2cap_conn_ready net/bluetooth/l2cap_core.c:-1 [inline]
BUG: KASAN: slab-use-after-free in l2cap_connect_cfm+0x70e/0x1220 net/bluetooth/l2cap_core.c:7278
Read of size 8 at addr ffff8880216b9480 by task kworker/u9:3/5840
CPU: 0 UID: 0 PID: 5840 Comm: kworker/u9:3 Not tainted 6.14.0-syzkaller-13546-g16cd1c265776 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: hci4 hci_rx_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0x16e/0x5b0 mm/kasan/report.c:521
kasan_report+0x143/0x180 mm/kasan/report.c:634
l2cap_conn_ready net/bluetooth/l2cap_core.c:-1 [inline]
l2cap_connect_cfm+0x70e/0x1220 net/bluetooth/l2cap_core.c:7278
hci_connect_cfm+0xa4/0x150 include/net/bluetooth/hci_core.h:2054
le_conn_complete_evt+0xcf4/0x12a0 net/bluetooth/hci_event.c:5779
hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5805
hci_event_func net/bluetooth/hci_event.c:7489 [inline]
hci_event_packet+0xa5e/0x1550 net/bluetooth/hci_event.c:7544
hci_rx_work+0x3f3/0xdb0 net/bluetooth/hci_core.c:4020
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xac5/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd50 kernel/workqueue.c:3400
kthread+0x7b9/0x940 kernel/kthread.c:464
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 5840:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x9d/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__kmalloc_cache_noprof+0x236/0x370 mm/slub.c:4362
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
l2cap_chan_create+0x50/0x760 net/bluetooth/l2cap_core.c:445
l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1900 [inline]
l2cap_sock_new_connection_cb+0x181/0x2b0 net/bluetooth/l2cap_sock.c:1482
l2cap_connect_cfm+0x37d/0x1220 net/bluetooth/l2cap_core.c:7261
hci_connect_cfm+0xa4/0x150 include/net/bluetooth/hci_core.h:2054
le_conn_complete_evt+0xcf4/0x12a0 net/bluetooth/hci_event.c:5779
hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5805
hci_event_func net/bluetooth/hci_event.c:7489 [inline]
hci_event_packet+0xa5e/0x1550 net/bluetooth/hci_event.c:7544
hci_rx_work+0x3f3/0xdb0 net/bluetooth/hci_core.c:4020
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xac5/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd50 kernel/workqueue.c:3400
kthread+0x7b9/0x940 kernel/kthread.c:464
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Freed by task 6846:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2389 [inline]
slab_free mm/slub.c:4646 [inline]
kfree+0x198/0x430 mm/slub.c:4845
l2cap_sock_cleanup_listen+0xed/0x3c0 net/bluetooth/l2cap_sock.c:1465
l2cap_sock_release+0x5d/0x1d0 net/bluetooth/l2cap_sock.c:1425
__sock_release net/socket.c:647 [inline]
sock_close+0xbe/0x240 net/socket.c:1391
__fput+0x3eb/0x9f0 fs/file_table.c:465
task_work_run+0x253/0x310 kernel/task_work.c:227
get_signal+0x15db/0x1730 kernel/signal.c:2807
arch_do_signal_or_restart+0x98/0x840 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff8880216b9000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1152 bytes inside of
freed 2048-byte region [ffff8880216b9000, ffff8880216b9800)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x216b8
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 ffff88801b042000 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b042000 dead000000000100 dead000000000122
head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea000085ae01 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 2623030319, free_ts 0
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1717
prep_new_page mm/page_alloc.c:1725 [inline]
get_page_from_freelist+0x352b/0x36c0 mm/page_alloc.c:3652
__alloc_frozen_pages_noprof+0x211/0x5b0 mm/page_alloc.c:4934
alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2459 [inline]
allocate_slab+0x8f/0x3a0 mm/slub.c:2623
new_slab mm/slub.c:2676 [inline]
___slab_alloc+0xc3b/0x1500 mm/slub.c:3862
__slab_alloc+0x58/0xa0 mm/slub.c:3952
__slab_alloc_node mm/slub.c:4027 [inline]
slab_alloc_node mm/slub.c:4188 [inline]
__kmalloc_cache_noprof+0x26a/0x370 mm/slub.c:4357
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
acpi_ds_create_walk_state+0x105/0x2a0 drivers/acpi/acpica/dswstate.c:518
acpi_ds_call_control_method+0x143/0x7e0 drivers/acpi/acpica/dsmethod.c:498
acpi_ps_parse_aml+0x2df/0x960 drivers/acpi/acpica/psparse.c:503
acpi_ps_execute_method+0x74d/0x880 drivers/acpi/acpica/psxface.c:190
acpi_ns_evaluate+0x5df/0xa40 drivers/acpi/acpica/nseval.c:205
acpi_evaluate_object+0x59d/0xaf0 drivers/acpi/acpica/nsxfeval.c:354
acpi_evaluate_integer+0x115/0x2f0 drivers/acpi/utils.c:260
acpi_bus_get_status_handle drivers/acpi/bus.c:82 [inline]
acpi_bus_get_status+0x1ad/0x470 drivers/acpi/bus.c:111
page_owner free stack trace missing
Memory state around the buggy address:
ffff8880216b9380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880216b9400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880216b9480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880216b9500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880216b9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================