=========================
WARNING: held lock freed!
6.14.0-syzkaller-05877-g1a9239bb4253 #0 Not tainted
-------------------------
syz.0.705/8575 is freeing memory ffff88807ce1d000-ffff88807ce1d7ff, with a lock still held there!
ffff88807ce1d258 (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1615 [inline]
ffff88807ce1d258 (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.}-{0:0}, at: bt_accept_dequeue+0xfa/0x570 net/bluetooth/af_bluetooth.c:276
2 locks held by syz.0.705/8575:
 #0: ffff88805f27b208 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
 #0: ffff88805f27b208 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: __sock_release net/socket.c:646 [inline]
 #0: ffff88805f27b208 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: sock_close+0x90/0x240 net/socket.c:1391
 #1: ffff88807ce1d258 (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1615 [inline]
 #1: ffff88807ce1d258 (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.}-{0:0}, at: bt_accept_dequeue+0xfa/0x570 net/bluetooth/af_bluetooth.c:276

stack backtrace:
CPU: 1 UID: 0 PID: 8575 Comm: syz.0.705 Not tainted 6.14.0-syzkaller-05877-g1a9239bb4253 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_freed_lock_bug kernel/locking/lockdep.c:6679 [inline]
 debug_check_no_locks_freed+0x1dd/0x220 kernel/locking/lockdep.c:6714
 slab_free_hook mm/slub.c:2304 [inline]
 slab_free mm/slub.c:4633 [inline]
 kfree+0x106/0x430 mm/slub.c:4832
 sk_prot_free net/core/sock.c:2232 [inline]
 __sk_destruct+0x50c/0x690 net/core/sock.c:2327
 bt_accept_dequeue+0x3d6/0x570 net/bluetooth/af_bluetooth.c:305
 l2cap_sock_cleanup_listen+0x30/0x3c0 net/bluetooth/l2cap_sock.c:1451
 l2cap_sock_release+0x5d/0x1d0 net/bluetooth/l2cap_sock.c:1425
 __sock_release net/socket.c:647 [inline]
 sock_close+0xbc/0x240 net/socket.c:1391
 __fput+0x3e9/0x9f0 fs/file_table.c:465
 task_work_run+0x251/0x310 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xa2a/0x2940 kernel/exit.c:954
 do_group_exit+0x207/0x2c0 kernel/exit.c:1103
 get_signal+0x1696/0x1730 kernel/signal.c:3035
 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
RIP: 0033:0x7fbed478d169
Code: Unable to access opcode bytes at 0x7fbed478d13f.
RSP: 002b:00007fbed55d40e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 00007fbed49a6088 RCX: 00007fbed478d169
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fbed49a6088
RBP: 00007fbed49a6080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbed49a608c
R13: 0000000000000000 R14: 00007fff98bcb680 R15: 00007fff98bcb768
 </TASK>
==================================================================
BUG: KASAN: slab-use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
BUG: KASAN: slab-use-after-free in do_raw_spin_lock+0x29d/0x370 kernel/locking/spinlock_debug.c:115
Read of size 4 at addr ffff88807ce1d1c4 by task syz.0.705/8575

CPU: 0 UID: 0 PID: 8575 Comm: syz.0.705 Not tainted 6.14.0-syzkaller-05877-g1a9239bb4253 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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
 debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
 do_raw_spin_lock+0x29d/0x370 kernel/locking/spinlock_debug.c:115
 spin_lock_bh include/linux/spinlock.h:356 [inline]
 release_sock+0x30/0x1f0 net/core/sock.c:3710
 bt_accept_dequeue+0x4e9/0x570 net/bluetooth/af_bluetooth.c:309
 l2cap_sock_cleanup_listen+0x30/0x3c0 net/bluetooth/l2cap_sock.c:1451
 l2cap_sock_release+0x5d/0x1d0 net/bluetooth/l2cap_sock.c:1425
 __sock_release net/socket.c:647 [inline]
 sock_close+0xbc/0x240 net/socket.c:1391
 __fput+0x3e9/0x9f0 fs/file_table.c:465
 task_work_run+0x251/0x310 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xa2a/0x2940 kernel/exit.c:954
 do_group_exit+0x207/0x2c0 kernel/exit.c:1103
 get_signal+0x1696/0x1730 kernel/signal.c:3035
 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
RIP: 0033:0x7fbed478d169
Code: Unable to access opcode bytes at 0x7fbed478d13f.
RSP: 002b:00007fbed55d40e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 00007fbed49a6088 RCX: 00007fbed478d169
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fbed49a6088
RBP: 00007fbed49a6080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbed49a608c
R13: 0000000000000000 R14: 00007fff98bcb680 R15: 00007fff98bcb768
 </TASK>

Allocated by task 5846:
 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]
 __do_kmalloc_node mm/slub.c:4318 [inline]
 __kmalloc_noprof+0x28e/0x4d0 mm/slub.c:4330
 kmalloc_noprof include/linux/slab.h:906 [inline]
 sk_prot_alloc+0xe0/0x210 net/core/sock.c:2196
 sk_alloc+0x3e/0x370 net/core/sock.c:2249
 bt_sock_alloc+0x3c/0x340 net/bluetooth/af_bluetooth.c:148
 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1891 [inline]
 l2cap_sock_new_connection_cb+0xe1/0x2b0 net/bluetooth/l2cap_sock.c:1482
 l2cap_connect_cfm+0x37b/0x1220 net/bluetooth/l2cap_core.c:7261
 hci_connect_cfm include/net/bluetooth/hci_core.h:2054 [inline]
 hci_remote_features_evt+0x623/0x9e0 net/bluetooth/hci_event.c:3736
 hci_event_func net/bluetooth/hci_event.c:7492 [inline]
 hci_event_packet+0xac9/0x1550 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+0xac3/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd30 kernel/workqueue.c:3400
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Freed by task 8575:
 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:2376 [inline]
 slab_free mm/slub.c:4633 [inline]
 kfree+0x198/0x430 mm/slub.c:4832
 sk_prot_free net/core/sock.c:2232 [inline]
 __sk_destruct+0x50c/0x690 net/core/sock.c:2327
 bt_accept_dequeue+0x3d6/0x570 net/bluetooth/af_bluetooth.c:305
 l2cap_sock_cleanup_listen+0x30/0x3c0 net/bluetooth/l2cap_sock.c:1451
 l2cap_sock_release+0x5d/0x1d0 net/bluetooth/l2cap_sock.c:1425
 __sock_release net/socket.c:647 [inline]
 sock_close+0xbc/0x240 net/socket.c:1391
 __fput+0x3e9/0x9f0 fs/file_table.c:465
 task_work_run+0x251/0x310 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xa2a/0x2940 kernel/exit.c:954
 do_group_exit+0x207/0x2c0 kernel/exit.c:1103
 get_signal+0x1696/0x1730 kernel/signal.c:3035
 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 ffff88807ce1d000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 452 bytes inside of
 freed 2048-byte region [ffff88807ce1d000, ffff88807ce1d800)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ce18
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b042000 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b042000 0000000000000000 dead000000000001
head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0001f38601 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
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 6537, tgid 6533 (syz.1.157), ts 98289571225, free_ts 98257234547
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551
 prep_new_page mm/page_alloc.c:1559 [inline]
 get_page_from_freelist+0x3695/0x37e0 mm/page_alloc.c:3477
 __alloc_frozen_pages_noprof+0x2c5/0x7b0 mm/page_alloc.c:4740
 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301
 alloc_slab_page mm/slub.c:2446 [inline]
 allocate_slab+0x8f/0x3a0 mm/slub.c:2610
 new_slab mm/slub.c:2663 [inline]
 ___slab_alloc+0xc3b/0x1500 mm/slub.c:3849
 __slab_alloc+0x58/0xa0 mm/slub.c:3939
 __slab_alloc_node mm/slub.c:4014 [inline]
 slab_alloc_node mm/slub.c:4175 [inline]
 __kmalloc_cache_noprof+0x26a/0x370 mm/slub.c:4344
 kmalloc_noprof include/linux/slab.h:902 [inline]
 kzalloc_noprof include/linux/slab.h:1036 [inline]
 fib6_net_init+0x1a1/0x880 net/ipv6/ip6_fib.c:2422
 ops_init+0x349/0x5b0 net/core/net_namespace.c:138
 setup_net+0x289/0x9f0 net/core/net_namespace.c:364
 copy_net_ns+0x33f/0x570 net/core/net_namespace.c:518
 create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
 ksys_unshare+0x5e2/0xad0 kernel/fork.c:3337
 __do_sys_unshare kernel/fork.c:3408 [inline]
 __se_sys_unshare kernel/fork.c:3406 [inline]
 __x64_sys_unshare+0x38/0x40 kernel/fork.c:3406
page last free pid 5206 tgid 5206 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_frozen_pages+0xe16/0x10f0 mm/page_alloc.c:2660
 discard_slab mm/slub.c:2707 [inline]
 __put_partials+0x160/0x1c0 mm/slub.c:3176
 put_cpu_partial+0x17e/0x250 mm/slub.c:3251
 __slab_free+0x294/0x390 mm/slub.c:4503
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4138 [inline]
 slab_alloc_node mm/slub.c:4187 [inline]
 kmem_cache_alloc_noprof+0x1e1/0x390 mm/slub.c:4194
 getname_flags+0xb6/0x530 fs/namei.c:146
 getname include/linux/fs.h:2844 [inline]
 getname_maybe_null include/linux/fs.h:2851 [inline]
 vfs_fstatat+0x43/0x150 fs/stat.c:363
 __do_sys_newfstatat fs/stat.c:532 [inline]
 __se_sys_newfstatat fs/stat.c:526 [inline]
 __x64_sys_newfstatat+0x11f/0x1a0 fs/stat.c:526
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88807ce1d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807ce1d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807ce1d180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff88807ce1d200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807ce1d280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================