==================================================================
BUG: KASAN: slab-use-after-free in l2cap_sock_ready_cb+0x1a9/0x1b0 net/bluetooth/l2cap_sock.c:1720
Read of size 8 at addr ffff8880353d6188 by task kworker/u9:7/5647

CPU: 0 UID: 0 PID: 5647 Comm: kworker/u9:7 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: hci6 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_sock_ready_cb+0x1a9/0x1b0 net/bluetooth/l2cap_sock.c:1720
 l2cap_chan_ready net/bluetooth/l2cap_core.c:1262 [inline]
 l2cap_le_start+0x1ea/0xd20 net/bluetooth/l2cap_core.c:1391
 l2cap_conn_ready net/bluetooth/l2cap_core.c:1644 [inline]
 l2cap_connect_cfm+0x8ce/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:3314
 process_scheduled_works kernel/workqueue.c:3397 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478
 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 25742:
 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
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5295 [inline]
 __kmalloc_noprof+0x301/0x850 mm/slub.c:5307
 kmalloc_noprof include/linux/slab.h:954 [inline]
 sk_prot_alloc+0x10b/0x2a0 net/core/sock.c:2247
 sk_alloc+0x36/0xe80 net/core/sock.c:2303
 bt_sock_alloc+0x3b/0x3a0 net/bluetooth/af_bluetooth.c:151
 l2cap_sock_alloc.constprop.0+0x33/0x1e0 net/bluetooth/l2cap_sock.c:1934
 l2cap_sock_create+0x123/0x210 net/bluetooth/l2cap_sock.c:1976
 bt_sock_create+0x185/0x350 net/bluetooth/af_bluetooth.c:135
 __sock_create+0x339/0x860 net/socket.c:1664
 sock_create net/socket.c:1722 [inline]
 __sys_socket_create net/socket.c:1759 [inline]
 __sys_socket+0x14d/0x260 net/socket.c:1806
 __do_sys_socket net/socket.c:1820 [inline]
 __se_sys_socket net/socket.c:1818 [inline]
 __x64_sys_socket+0x72/0xb0 net/socket.c:1818
 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

Freed by task 25742:
 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
 sk_prot_free net/core/sock.c:2286 [inline]
 __sk_destruct+0x88c/0xab0 net/core/sock.c:2386
 sk_destruct+0xc8/0xf0 net/core/sock.c:2414
 __sk_free+0xf4/0x3e0 net/core/sock.c:2425
 sk_free+0x61/0x90 net/core/sock.c:2436
 sock_put include/net/sock.h:2010 [inline]
 l2cap_sock_kill net/bluetooth/l2cap_sock.c:1290 [inline]
 l2cap_sock_kill+0x176/0x310 net/bluetooth/l2cap_sock.c:1275
 l2cap_sock_release+0x1cb/0x280 net/bluetooth/l2cap_sock.c:1463
 __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 ffff8880353d6000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 392 bytes inside of
 freed 2048-byte region [ffff8880353d6000, ffff8880353d6800)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x353d0
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 ffff88813fe34000 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88813fe34000 dead000000000100 dead000000000122
head: 0000000000000000 0000000800080008 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 22381436083, free_ts 0
 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:7271
 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]
 __do_kmalloc_node mm/slub.c:5294 [inline]
 __kmalloc_node_track_caller_noprof+0x694/0x850 mm/slub.c:5407
 __do_krealloc mm/slub.c:6710 [inline]
 krealloc_node_align_noprof+0x1f9/0x3e0 mm/slub.c:6769
 add_sysfs_param+0xdb/0x970 kernel/params.c:648
 kernel_add_sysfs_param kernel/params.c:797 [inline]
 param_sysfs_builtin kernel/params.c:836 [inline]
 param_sysfs_builtin_init+0x313/0x3f0 kernel/params.c:972
 do_one_initcall+0x121/0x750 init/main.c:1392
 do_initcall_level init/main.c:1454 [inline]
 do_initcalls init/main.c:1470 [inline]
 do_basic_setup init/main.c:1490 [inline]
 kernel_init_freeable+0x6ea/0x7b0 init/main.c:1703
 kernel_init+0x1f/0x1e0 init/main.c:1593
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8880353d6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880353d6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880353d6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff8880353d6200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880353d6280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in sock_def_readable+0x5c1/0x610 net/core/sock.c:3612
Read of size 8 at addr ffff8880353d6180 by task kworker/u9:7/5647

CPU: 0 UID: 0 PID: 5647 Comm: kworker/u9:7 Tainted: G    B        L      syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: hci6 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
 sock_def_readable+0x5c1/0x610 net/core/sock.c:3612
 l2cap_sock_ready_cb+0x11f/0x1b0 net/bluetooth/l2cap_sock.c:1720
 l2cap_chan_ready net/bluetooth/l2cap_core.c:1262 [inline]
 l2cap_le_start+0x1ea/0xd20 net/bluetooth/l2cap_core.c:1391
 l2cap_conn_ready net/bluetooth/l2cap_core.c:1644 [inline]
 l2cap_connect_cfm+0x8ce/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:3314
 process_scheduled_works kernel/workqueue.c:3397 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478
 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 25742:
 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
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5295 [inline]
 __kmalloc_noprof+0x301/0x850 mm/slub.c:5307
 kmalloc_noprof include/linux/slab.h:954 [inline]
 sk_prot_alloc+0x10b/0x2a0 net/core/sock.c:2247
 sk_alloc+0x36/0xe80 net/core/sock.c:2303
 bt_sock_alloc+0x3b/0x3a0 net/bluetooth/af_bluetooth.c:151
 l2cap_sock_alloc.constprop.0+0x33/0x1e0 net/bluetooth/l2cap_sock.c:1934
 l2cap_sock_create+0x123/0x210 net/bluetooth/l2cap_sock.c:1976
 bt_sock_create+0x185/0x350 net/bluetooth/af_bluetooth.c:135
 __sock_create+0x339/0x860 net/socket.c:1664
 sock_create net/socket.c:1722 [inline]
 __sys_socket_create net/socket.c:1759 [inline]
 __sys_socket+0x14d/0x260 net/socket.c:1806
 __do_sys_socket net/socket.c:1820 [inline]
 __se_sys_socket net/socket.c:1818 [inline]
 __x64_sys_socket+0x72/0xb0 net/socket.c:1818
 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

Freed by task 25742:
 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
 sk_prot_free net/core/sock.c:2286 [inline]
 __sk_destruct+0x88c/0xab0 net/core/sock.c:2386
 sk_destruct+0xc8/0xf0 net/core/sock.c:2414
 __sk_free+0xf4/0x3e0 net/core/sock.c:2425
 sk_free+0x61/0x90 net/core/sock.c:2436
 sock_put include/net/sock.h:2010 [inline]
 l2cap_sock_kill net/bluetooth/l2cap_sock.c:1290 [inline]
 l2cap_sock_kill+0x176/0x310 net/bluetooth/l2cap_sock.c:1275
 l2cap_sock_release+0x1cb/0x280 net/bluetooth/l2cap_sock.c:1463
 __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 ffff8880353d6000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 384 bytes inside of
 freed 2048-byte region [ffff8880353d6000, ffff8880353d6800)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x353d0
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 ffff88813fe34000 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88813fe34000 dead000000000100 dead000000000122
head: 0000000000000000 0000000800080008 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 22381436083, free_ts 0
 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:7271
 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]
 __do_kmalloc_node mm/slub.c:5294 [inline]
 __kmalloc_node_track_caller_noprof+0x694/0x850 mm/slub.c:5407
 __do_krealloc mm/slub.c:6710 [inline]
 krealloc_node_align_noprof+0x1f9/0x3e0 mm/slub.c:6769
 add_sysfs_param+0xdb/0x970 kernel/params.c:648
 kernel_add_sysfs_param kernel/params.c:797 [inline]
 param_sysfs_builtin kernel/params.c:836 [inline]
 param_sysfs_builtin_init+0x313/0x3f0 kernel/params.c:972
 do_one_initcall+0x121/0x750 init/main.c:1392
 do_initcall_level init/main.c:1454 [inline]
 do_initcalls init/main.c:1470 [inline]
 do_basic_setup init/main.c:1490 [inline]
 kernel_init_freeable+0x6ea/0x7b0 init/main.c:1703
 kernel_init+0x1f/0x1e0 init/main.c:1593
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8880353d6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880353d6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880353d6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8880353d6200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880353d6280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:82 [inline]
BUG: KASAN: slab-use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
BUG: KASAN: slab-use-after-free in sock_flag include/net/sock.h:1061 [inline]
BUG: KASAN: slab-use-after-free in sk_wake_async_rcu include/net/sock.h:2592 [inline]
BUG: KASAN: slab-use-after-free in sock_def_readable+0x16a/0x610 net/core/sock.c:3616
Read of size 8 at addr ffff8880353d6060 by task kworker/u9:7/5647

CPU: 0 UID: 0 PID: 5647 Comm: kworker/u9:7 Tainted: G    B        L      syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: hci6 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
 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]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 sock_flag include/net/sock.h:1061 [inline]
 sk_wake_async_rcu include/net/sock.h:2592 [inline]
 sock_def_readable+0x16a/0x610 net/core/sock.c:3616
 l2cap_sock_ready_cb+0x11f/0x1b0 net/bluetooth/l2cap_sock.c:1720
 l2cap_chan_ready net/bluetooth/l2cap_core.c:1262 [inline]
 l2cap_le_start+0x1ea/0xd20 net/bluetooth/l2cap_core.c:1391
 l2cap_conn_ready net/bluetooth/l2cap_core.c:1644 [inline]
 l2cap_connect_cfm+0x8ce/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:3314
 process_scheduled_works kernel/workqueue.c:3397 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478
 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 25742:
 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
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5295 [inline]
 __kmalloc_noprof+0x301/0x850 mm/slub.c:5307
 kmalloc_noprof include/linux/slab.h:954 [inline]
 sk_prot_alloc+0x10b/0x2a0 net/core/sock.c:2247
 sk_alloc+0x36/0xe80 net/core/sock.c:2303
 bt_sock_alloc+0x3b/0x3a0 net/bluetooth/af_bluetooth.c:151
 l2cap_sock_alloc.constprop.0+0x33/0x1e0 net/bluetooth/l2cap_sock.c:1934
 l2cap_sock_create+0x123/0x210 net/bluetooth/l2cap_sock.c:1976
 bt_sock_create+0x185/0x350 net/bluetooth/af_bluetooth.c:135
 __sock_create+0x339/0x860 net/socket.c:1664
 sock_create net/socket.c:1722 [inline]
 __sys_socket_create net/socket.c:1759 [inline]
 __sys_socket+0x14d/0x260 net/socket.c:1806
 __do_sys_socket net/socket.c:1820 [inline]
 __se_sys_socket net/socket.c:1818 [inline]
 __x64_sys_socket+0x72/0xb0 net/socket.c:1818
 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

Freed by task 25742:
 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
 sk_prot_free net/core/sock.c:2286 [inline]
 __sk_destruct+0x88c/0xab0 net/core/sock.c:2386
 sk_destruct+0xc8/0xf0 net/core/sock.c:2414
 __sk_free+0xf4/0x3e0 net/core/sock.c:2425
 sk_free+0x61/0x90 net/core/sock.c:2436
 sock_put include/net/sock.h:2010 [inline]
 l2cap_sock_kill net/bluetooth/l2cap_sock.c:1290 [inline]
 l2cap_sock_kill+0x176/0x310 net/bluetooth/l2cap_sock.c:1275
 l2cap_sock_release+0x1cb/0x280 net/bluetooth/l2cap_sock.c:1463
 __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 ffff8880353d6000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 96 bytes inside of
 freed 2048-byte region [ffff8880353d6000, ffff8880353d6800)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x353d0
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 ffff88813fe34000 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88813fe34000 dead000000000100 dead000000000122
head: 0000000000000000 0000000800080008 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 22381436083, free_ts 0
 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:7271
 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]
 __do_kmalloc_node mm/slub.c:5294 [inline]
 __kmalloc_node_track_caller_noprof+0x694/0x850 mm/slub.c:5407
 __do_krealloc mm/slub.c:6710 [inline]
 krealloc_node_align_noprof+0x1f9/0x3e0 mm/slub.c:6769
 add_sysfs_param+0xdb/0x970 kernel/params.c:648
 kernel_add_sysfs_param kernel/params.c:797 [inline]
 param_sysfs_builtin kernel/params.c:836 [inline]
 param_sysfs_builtin_init+0x313/0x3f0 kernel/params.c:972
 do_one_initcall+0x121/0x750 init/main.c:1392
 do_initcall_level init/main.c:1454 [inline]
 do_initcalls init/main.c:1470 [inline]
 do_basic_setup init/main.c:1490 [inline]
 kernel_init_freeable+0x6ea/0x7b0 init/main.c:1703
 kernel_init+0x1f/0x1e0 init/main.c:1593
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8880353d5f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880353d5f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880353d6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff8880353d6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880353d6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in constant_test_bit arch/x86/include/asm/bitops.h:202 [inline]
BUG: KASAN: slab-use-after-free in arch_test_bit arch/x86/include/asm/bitops.h:232 [inline]
BUG: KASAN: slab-use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
BUG: KASAN: slab-use-after-free in sock_flag include/net/sock.h:1061 [inline]
BUG: KASAN: slab-use-after-free in sk_wake_async_rcu include/net/sock.h:2592 [inline]
BUG: KASAN: slab-use-after-free in sock_def_readable+0x5b4/0x610 net/core/sock.c:3616
Read of size 8 at addr ffff8880353d6060 by task kworker/u9:7/5647

CPU: 0 UID: 0 PID: 5647 Comm: kworker/u9:7 Tainted: G    B        L      syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: hci6 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
 constant_test_bit arch/x86/include/asm/bitops.h:202 [inline]
 arch_test_bit arch/x86/include/asm/bitops.h:232 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
 sock_flag include/net/sock.h:1061 [inline]
 sk_wake_async_rcu include/net/sock.h:2592 [inline]
 sock_def_readable+0x5b4/0x610 net/core/sock.c:3616
 l2cap_sock_ready_cb+0x11f/0x1b0 net/bluetooth/l2cap_sock.c:1720
 l2cap_chan_ready net/bluetooth/l2cap_core.c:1262 [inline]
 l2cap_le_start+0x1ea/0xd20 net/bluetooth/l2cap_core.c:1391
 l2cap_conn_ready net/bluetooth/l2cap_core.c:1644 [inline]
 l2cap_connect_cfm+0x8ce/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:3314
 process_scheduled_works kernel/workqueue.c:3397 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478
 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 25742:
 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
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5295 [inline]
 __kmalloc_noprof+0x301/0x850 mm/slub.c:5307
 kmalloc_noprof include/linux/slab.h:954 [inline]
 sk_prot_alloc+0x10b/0x2a0 net/core/sock.c:2247
 sk_alloc+0x36/0xe80 net/core/sock.c:2303
 bt_sock_alloc+0x3b/0x3a0 net/bluetooth/af_bluetooth.c:151
 l2cap_sock_alloc.constprop.0+0x33/0x1e0 net/bluetooth/l2cap_sock.c:1934
 l2cap_sock_create+0x123/0x210 net/bluetooth/l2cap_sock.c:1976
 bt_sock_create+0x185/0x350 net/bluetooth/af_bluetooth.c:135
 __sock_create+0x339/0x860 net/socket.c:1664
 sock_create net/socket.c:1722 [inline]
 __sys_socket_create net/socket.c:1759 [inline]
 __sys_socket+0x14d/0x260 net/socket.c:1806
 __do_sys_socket net/socket.c:1820 [inline]
 __se_sys_socket net/socket.c:1818 [inline]
 __x64_sys_socket+0x72/0xb0 net/socket.c:1818
 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

Freed by task 25742:
 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
 sk_prot_free net/core/sock.c:2286 [inline]
 __sk_destruct+0x88c/0xab0 net/core/sock.c:2386
 sk_destruct+0xc8/0xf0 net/core/sock.c:2414
 __sk_free+0xf4/0x3e0 net/core/sock.c:2425
 sk_free+0x61/0x90 net/core/sock.c:2436
 sock_put include/net/sock.h:2010 [inline]
 l2cap_sock_kill net/bluetooth/l2cap_sock.c:1290 [inline]
 l2cap_sock_kill+0x176/0x310 net/bluetooth/l2cap_sock.c:1275
 l2cap_sock_release+0x1cb/0x280 net/bluetooth/l2cap_sock.c:1463
 __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 ffff8880353d6000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 96 bytes inside of
 freed 2048-byte region [ffff8880353d6000, ffff8880353d6800)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x353d0
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 ffff88813fe34000 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88813fe34000 dead000000000100 dead000000000122
head: 0000000000000000 0000000800080008 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 22381436083, free_ts 0
 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:7271
 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]
 __do_kmalloc_node mm/slub.c:5294 [inline]
 __kmalloc_node_track_caller_noprof+0x694/0x850 mm/slub.c:5407
 __do_krealloc mm/slub.c:6710 [inline]
 krealloc_node_align_noprof+0x1f9/0x3e0 mm/slub.c:6769
 add_sysfs_param+0xdb/0x970 kernel/params.c:648
 kernel_add_sysfs_param kernel/params.c:797 [inline]
 param_sysfs_builtin kernel/params.c:836 [inline]
 param_sysfs_builtin_init+0x313/0x3f0 kernel/params.c:972
 do_one_initcall+0x121/0x750 init/main.c:1392
 do_initcall_level init/main.c:1454 [inline]
 do_initcalls init/main.c:1470 [inline]
 do_basic_setup init/main.c:1490 [inline]
 kernel_init_freeable+0x6ea/0x7b0 init/main.c:1703
 kernel_init+0x1f/0x1e0 init/main.c:1593
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8880353d5f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880353d5f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880353d6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff8880353d6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880353d6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================