======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc2-syzkaller-00215-g174714f0e505 #0 Not tainted
------------------------------------------------------
syz.2.340/6398 is trying to acquire lock:
ffff88807fcf4078 (&hdev->lock){+.+.}-{3:3}, at: mgmt_remove_adv_monitor_complete+0xaf/0x550 net/bluetooth/mgmt.c:5454

but task is already holding lock:
ffff88807fcf4690 (&hdev->cmd_sync_work_lock){+.+.}-{3:3}, at: hci_cmd_sync_dequeue+0x44/0x3d0 net/bluetooth/hci_sync.c:883

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&hdev->cmd_sync_work_lock){+.+.}-{3:3}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
       __mutex_lock_common kernel/locking/mutex.c:608 [inline]
       __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
       hci_cmd_sync_lookup_entry net/bluetooth/hci_sync.c:834 [inline]
       hci_cmd_sync_queue_once+0x43/0x240 net/bluetooth/hci_sync.c:778
       le_conn_complete_evt+0xae1/0x12e0 net/bluetooth/hci_event.c:5773
       hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5784
       hci_event_func net/bluetooth/hci_event.c:7440 [inline]
       hci_event_packet+0xa55/0x1540 net/bluetooth/hci_event.c:7495
       hci_rx_work+0x3fe/0xd80 net/bluetooth/hci_core.c:4025
       process_one_work kernel/workqueue.c:3229 [inline]
       process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
       worker_thread+0x870/0xd30 kernel/workqueue.c:3391
       kthread+0x2f0/0x390 kernel/kthread.c:389
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

-> #0 (&hdev->lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
       __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
       __mutex_lock_common kernel/locking/mutex.c:608 [inline]
       __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
       mgmt_remove_adv_monitor_complete+0xaf/0x550 net/bluetooth/mgmt.c:5454
       _hci_cmd_sync_cancel_entry net/bluetooth/hci_sync.c:641 [inline]
       hci_cmd_sync_dequeue+0x22b/0x3d0 net/bluetooth/hci_sync.c:886
       cmd_complete_rsp+0x4c/0x180 net/bluetooth/mgmt.c:1461
       mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259
       mgmt_index_removed+0x133/0x390 net/bluetooth/mgmt.c:9407
       hci_sock_bind+0xcce/0x1150 net/bluetooth/hci_sock.c:1307
       __sys_bind_socket net/socket.c:1843 [inline]
       __sys_bind+0x22d/0x2d0 net/socket.c:1867
       __do_sys_bind net/socket.c:1875 [inline]
       __se_sys_bind net/socket.c:1873 [inline]
       __x64_sys_bind+0x7a/0x90 net/socket.c:1873
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&hdev->cmd_sync_work_lock);
                               lock(&hdev->lock);
                               lock(&hdev->cmd_sync_work_lock);
  lock(&hdev->lock);

 *** DEADLOCK ***

2 locks held by syz.2.340/6398:
 #0: ffff88805ea0c258 (sk_lock-AF_BLUETOOTH-BTPROTO_HCI){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1611 [inline]
 #0: ffff88805ea0c258 (sk_lock-AF_BLUETOOTH-BTPROTO_HCI){+.+.}-{0:0}, at: hci_sock_bind+0x149/0x1150 net/bluetooth/hci_sock.c:1202
 #1: ffff88807fcf4690 (&hdev->cmd_sync_work_lock){+.+.}-{3:3}, at: hci_cmd_sync_dequeue+0x44/0x3d0 net/bluetooth/hci_sync.c:883

stack backtrace:
CPU: 1 UID: 0 PID: 6398 Comm: syz.2.340 Not tainted 6.12.0-rc2-syzkaller-00215-g174714f0e505 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
 __mutex_lock_common kernel/locking/mutex.c:608 [inline]
 __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
 mgmt_remove_adv_monitor_complete+0xaf/0x550 net/bluetooth/mgmt.c:5454
 _hci_cmd_sync_cancel_entry net/bluetooth/hci_sync.c:641 [inline]
 hci_cmd_sync_dequeue+0x22b/0x3d0 net/bluetooth/hci_sync.c:886
 cmd_complete_rsp+0x4c/0x180 net/bluetooth/mgmt.c:1461
 mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259
 mgmt_index_removed+0x133/0x390 net/bluetooth/mgmt.c:9407
 hci_sock_bind+0xcce/0x1150 net/bluetooth/hci_sock.c:1307
 __sys_bind_socket net/socket.c:1843 [inline]
 __sys_bind+0x22d/0x2d0 net/socket.c:1867
 __do_sys_bind net/socket.c:1875 [inline]
 __se_sys_bind net/socket.c:1873 [inline]
 __x64_sys_bind+0x7a/0x90 net/socket.c:1873
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1830d7dff9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1831aff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 00007f1830f36058 RCX: 00007f1830d7dff9
RDX: 0000000000000006 RSI: 0000000020000040 RDI: 0000000000000005
RBP: 00007f1830df0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1830f36058 R15: 00007fff95263f68
 </TASK>
==================================================================
BUG: KASAN: slab-use-after-free in cmd_complete_rsp+0x67/0x180 net/bluetooth/mgmt.c:1463
Read of size 8 at addr ffff88802ce44d40 by task syz.2.340/6398

CPU: 1 UID: 0 PID: 6398 Comm: syz.2.340 Not tainted 6.12.0-rc2-syzkaller-00215-g174714f0e505 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 cmd_complete_rsp+0x67/0x180 net/bluetooth/mgmt.c:1463
 mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259
 mgmt_index_removed+0x133/0x390 net/bluetooth/mgmt.c:9407
 hci_sock_bind+0xcce/0x1150 net/bluetooth/hci_sock.c:1307
 __sys_bind_socket net/socket.c:1843 [inline]
 __sys_bind+0x22d/0x2d0 net/socket.c:1867
 __do_sys_bind net/socket.c:1875 [inline]
 __se_sys_bind net/socket.c:1873 [inline]
 __x64_sys_bind+0x7a/0x90 net/socket.c:1873
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1830d7dff9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1831aff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 00007f1830f36058 RCX: 00007f1830d7dff9
RDX: 0000000000000006 RSI: 0000000020000040 RDI: 0000000000000005
RBP: 00007f1830df0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1830f36058 R15: 00007fff95263f68
 </TASK>

Allocated by task 6387:
 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+0x98/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:257 [inline]
 __kmalloc_cache_noprof+0x19c/0x2c0 mm/slub.c:4295
 kmalloc_noprof include/linux/slab.h:878 [inline]
 kzalloc_noprof include/linux/slab.h:1014 [inline]
 mgmt_pending_new+0x65/0x250 net/bluetooth/mgmt_util.c:269
 mgmt_pending_add+0x36/0x120 net/bluetooth/mgmt_util.c:296
 remove_adv_monitor+0x102/0x1b0 net/bluetooth/mgmt.c:5498
 hci_mgmt_cmd+0xc47/0x11d0 net/bluetooth/hci_sock.c:1712
 hci_sock_sendmsg+0x7b8/0x11c0 net/bluetooth/hci_sock.c:1832
 sock_sendmsg_nosec net/socket.c:729 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:744
 sock_write_iter+0x2d7/0x3f0 net/socket.c:1165
 new_sync_write fs/read_write.c:590 [inline]
 vfs_write+0xa6d/0xc90 fs/read_write.c:683
 ksys_write+0x183/0x2b0 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 6398:
 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:579
 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:230 [inline]
 slab_free_hook mm/slub.c:2342 [inline]
 slab_free mm/slub.c:4579 [inline]
 kfree+0x1a0/0x440 mm/slub.c:4727
 mgmt_remove_adv_monitor_complete+0x2bf/0x550 net/bluetooth/mgmt.c:5463
 _hci_cmd_sync_cancel_entry net/bluetooth/hci_sync.c:641 [inline]
 hci_cmd_sync_dequeue+0x22b/0x3d0 net/bluetooth/hci_sync.c:886
 cmd_complete_rsp+0x4c/0x180 net/bluetooth/mgmt.c:1461
 mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259
 mgmt_index_removed+0x133/0x390 net/bluetooth/mgmt.c:9407
 hci_sock_bind+0xcce/0x1150 net/bluetooth/hci_sock.c:1307
 __sys_bind_socket net/socket.c:1843 [inline]
 __sys_bind+0x22d/0x2d0 net/socket.c:1867
 __do_sys_bind net/socket.c:1875 [inline]
 __se_sys_bind net/socket.c:1873 [inline]
 __x64_sys_bind+0x7a/0x90 net/socket.c:1873
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802ce44d00
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 64 bytes inside of
 freed 96-byte region [ffff88802ce44d00, ffff88802ce44d60)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ce44
ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801ac41280 ffffea000070cf00 dead000000000003
raw: 0000000000000000 0000000000200020 00000001f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 5230, tgid 5230 (syz-executor), ts 77184322649, free_ts 76870005870
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1545 [inline]
 get_page_from_freelist+0x3045/0x3190 mm/page_alloc.c:3457
 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4733
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_slab_page+0x59/0x120 mm/slub.c:2414
 allocate_slab+0x5a/0x2f0 mm/slub.c:2578
 new_slab mm/slub.c:2631 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3818
 __slab_alloc+0x58/0xa0 mm/slub.c:3908
 __slab_alloc_node mm/slub.c:3961 [inline]
 slab_alloc_node mm/slub.c:4122 [inline]
 __do_kmalloc_node mm/slub.c:4263 [inline]
 __kmalloc_node_noprof+0x286/0x440 mm/slub.c:4270
 kmalloc_array_node_noprof include/linux/slab.h:995 [inline]
 alloc_slab_obj_exts mm/slub.c:1968 [inline]
 account_slab mm/slub.c:2541 [inline]
 allocate_slab+0xb6/0x2f0 mm/slub.c:2596
 new_slab mm/slub.c:2631 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3818
 __slab_alloc+0x58/0xa0 mm/slub.c:3908
 __slab_alloc_node mm/slub.c:3961 [inline]
 slab_alloc_node mm/slub.c:4122 [inline]
 kmem_cache_alloc_lru_noprof+0x1c5/0x2b0 mm/slub.c:4153
 alloc_inode+0x87/0x1a0 fs/inode.c:267
 new_inode_pseudo fs/inode.c:1104 [inline]
 new_inode+0x22/0x1d0 fs/inode.c:1123
 debugfs_get_inode fs/debugfs/inode.c:72 [inline]
 __debugfs_create_file+0x142/0x4b0 fs/debugfs/inode.c:433
 add_sta_files net/mac80211/debugfs_netdev.c:849 [inline]
 add_files net/mac80211/debugfs_netdev.c:959 [inline]
 ieee80211_debugfs_add_netdev net/mac80211/debugfs_netdev.c:1012 [inline]
 ieee80211_debugfs_recreate_netdev+0xc27/0x1400 net/mac80211/debugfs_netdev.c:1045
page last free pid 5280 tgid 5280 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1108 [inline]
 free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2638
 __slab_free+0x31b/0x3d0 mm/slub.c:4490
 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:247 [inline]
 slab_post_alloc_hook mm/slub.c:4085 [inline]
 slab_alloc_node mm/slub.c:4134 [inline]
 kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4186
 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:668
 alloc_skb include/linux/skbuff.h:1322 [inline]
 alloc_skb_with_frags+0xc3/0x820 net/core/skbuff.c:6612
 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2883
 sock_alloc_send_skb include/net/sock.h:1782 [inline]
 mld_newpack+0x1c3/0xa90 net/ipv6/mcast.c:1747
 add_grhead net/ipv6/mcast.c:1850 [inline]
 add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1988
 mld_send_cr net/ipv6/mcast.c:2114 [inline]
 mld_ifc_work+0x691/0xd90 net/ipv6/mcast.c:2651
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147

Memory state around the buggy address:
 ffff88802ce44c00: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
 ffff88802ce44c80: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
>ffff88802ce44d00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                                           ^
 ffff88802ce44d80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff88802ce44e00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================