======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc7-syzkaller #0 Not tainted
------------------------------------------------------
kworker/u33:1/5298 is trying to acquire lock:
ffff88804ca91258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1611 [inline]
ffff88804ca91258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_ready net/bluetooth/sco.c:1296 [inline]
ffff88804ca91258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_connect_cfm+0x3ee/0xc10 net/bluetooth/sco.c:1368

but task is already holding lock:
ffff888031a2c220 (&conn->lock#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff888031a2c220 (&conn->lock#2){+.+.}-{2:2}, at: sco_conn_ready net/bluetooth/sco.c:1283 [inline]
ffff888031a2c220 (&conn->lock#2){+.+.}-{2:2}, at: sco_connect_cfm+0x2d1/0xc10 net/bluetooth/sco.c:1368

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&conn->lock#2){+.+.}-{2:2}:
       __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
       _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
       spin_lock include/linux/spinlock.h:351 [inline]
       sco_chan_add net/bluetooth/sco.c:240 [inline]
       sco_connect net/bluetooth/sco.c:293 [inline]
       sco_sock_connect+0x39c/0xb00 net/bluetooth/sco.c:602
       __sys_connect_file+0x14d/0x190 net/socket.c:2071
       __sys_connect+0x147/0x180 net/socket.c:2088
       __do_sys_connect net/socket.c:2098 [inline]
       __se_sys_connect net/socket.c:2095 [inline]
       __x64_sys_connect+0x72/0xb0 net/socket.c:2095
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain kernel/locking/lockdep.c:3904 [inline]
       __lock_acquire+0x250b/0x3ce0 kernel/locking/lockdep.c:5202
       lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5825
       lock_sock_nested+0x3a/0xf0 net/core/sock.c:3611
       lock_sock include/net/sock.h:1611 [inline]
       sco_conn_ready net/bluetooth/sco.c:1296 [inline]
       sco_connect_cfm+0x3ee/0xc10 net/bluetooth/sco.c:1368
       hci_connect_cfm include/net/bluetooth/hci_core.h:1960 [inline]
       hci_sync_conn_complete_evt+0x3a1/0xa10 net/bluetooth/hci_event.c:5009
       hci_event_func net/bluetooth/hci_event.c:7443 [inline]
       hci_event_packet+0x9eb/0x1180 net/bluetooth/hci_event.c:7495
       hci_rx_work+0x2c6/0x16c0 net/bluetooth/hci_core.c:4031
       process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
       process_scheduled_works kernel/workqueue.c:3310 [inline]
       worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
       kthread+0x2c1/0x3a0 kernel/kthread.c:389
       ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&conn->lock#2);
                               lock(sk_lock-AF_BLUETOOTH-BTPROTO_SCO);
                               lock(&conn->lock#2);
  lock(sk_lock-AF_BLUETOOTH-BTPROTO_SCO);

 *** DEADLOCK ***

5 locks held by kworker/u33:1/5298:
 #0: ffff888033080948 ((wq_completion)hci3#2){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204
 #1: ffffc90028aefd80 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
 #2: ffff888034fe0078 (&hdev->lock){+.+.}-{3:3}, at: hci_sync_conn_complete_evt+0x118/0xa10 net/bluetooth/hci_event.c:4926
 #3: ffffffff9014bba8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1957 [inline]
 #3: ffffffff9014bba8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_sync_conn_complete_evt+0x336/0xa10 net/bluetooth/hci_event.c:5009
 #4: ffff888031a2c220 (&conn->lock#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #4: ffff888031a2c220 (&conn->lock#2){+.+.}-{2:2}, at: sco_conn_ready net/bluetooth/sco.c:1283 [inline]
 #4: ffff888031a2c220 (&conn->lock#2){+.+.}-{2:2}, at: sco_connect_cfm+0x2d1/0xc10 net/bluetooth/sco.c:1368

stack backtrace:
CPU: 1 UID: 0 PID: 5298 Comm: kworker/u33:1 Not tainted 6.12.0-rc7-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: hci3 hci_rx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_circular_bug+0x41c/0x610 kernel/locking/lockdep.c:2074
 check_noncircular+0x31a/0x400 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 kernel/locking/lockdep.c:3904 [inline]
 __lock_acquire+0x250b/0x3ce0 kernel/locking/lockdep.c:5202
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5825
 lock_sock_nested+0x3a/0xf0 net/core/sock.c:3611
 lock_sock include/net/sock.h:1611 [inline]
 sco_conn_ready net/bluetooth/sco.c:1296 [inline]
 sco_connect_cfm+0x3ee/0xc10 net/bluetooth/sco.c:1368
 hci_connect_cfm include/net/bluetooth/hci_core.h:1960 [inline]
 hci_sync_conn_complete_evt+0x3a1/0xa10 net/bluetooth/hci_event.c:5009
 hci_event_func net/bluetooth/hci_event.c:7443 [inline]
 hci_event_packet+0x9eb/0x1180 net/bluetooth/hci_event.c:7495
 hci_rx_work+0x2c6/0x16c0 net/bluetooth/hci_core.c:4031
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
BUG: sleeping function called from invalid context at net/core/sock.c:3613
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5298, name: kworker/u33:1
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
INFO: lockdep is turned off.
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 1 UID: 0 PID: 5298 Comm: kworker/u33:1 Not tainted 6.12.0-rc7-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: hci3 hci_rx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
 __might_resched+0x3c0/0x5e0 kernel/sched/core.c:8653
 lock_sock_nested+0x4b/0xf0 net/core/sock.c:3613
 lock_sock include/net/sock.h:1611 [inline]
 sco_conn_ready net/bluetooth/sco.c:1296 [inline]
 sco_connect_cfm+0x3ee/0xc10 net/bluetooth/sco.c:1368
 hci_connect_cfm include/net/bluetooth/hci_core.h:1960 [inline]
 hci_sync_conn_complete_evt+0x3a1/0xa10 net/bluetooth/hci_event.c:5009
 hci_event_func net/bluetooth/hci_event.c:7443 [inline]
 hci_event_packet+0x9eb/0x1180 net/bluetooth/hci_event.c:7495
 hci_rx_work+0x2c6/0x16c0 net/bluetooth/hci_core.c:4031
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </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+0x271/0x2c0 kernel/locking/spinlock_debug.c:115
Read of size 4 at addr ffff88804ca911c4 by task kworker/u33:1/5298

CPU: 1 UID: 0 PID: 5298 Comm: kworker/u33:1 Tainted: G        W          6.12.0-rc7-syzkaller #0
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: hci3 hci_rx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:488
 kasan_report+0xd9/0x110 mm/kasan/report.c:601
 debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
 do_raw_spin_lock+0x271/0x2c0 kernel/locking/spinlock_debug.c:115
 spin_lock_bh include/linux/spinlock.h:356 [inline]
 lock_sock_nested+0x5f/0xf0 net/core/sock.c:3614
 lock_sock include/net/sock.h:1611 [inline]
 sco_conn_ready net/bluetooth/sco.c:1296 [inline]
 sco_connect_cfm+0x3ee/0xc10 net/bluetooth/sco.c:1368
 hci_connect_cfm include/net/bluetooth/hci_core.h:1960 [inline]
 hci_sync_conn_complete_evt+0x3a1/0xa10 net/bluetooth/hci_event.c:5009
 hci_event_func net/bluetooth/hci_event.c:7443 [inline]
 hci_event_packet+0x9eb/0x1180 net/bluetooth/hci_event.c:7495
 hci_rx_work+0x2c6/0x16c0 net/bluetooth/hci_core.c:4031
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 6396:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:257 [inline]
 __do_kmalloc_node mm/slub.c:4264 [inline]
 __kmalloc_noprof+0x1e8/0x400 mm/slub.c:4276
 kmalloc_noprof include/linux/slab.h:882 [inline]
 sk_prot_alloc+0x1a8/0x2a0 net/core/sock.c:2164
 sk_alloc+0x36/0xb90 net/core/sock.c:2217
 bt_sock_alloc+0x3b/0x3a0 net/bluetooth/af_bluetooth.c:148
 sco_sock_alloc net/bluetooth/sco.c:506 [inline]
 sco_sock_create+0xe3/0x3c0 net/bluetooth/sco.c:537
 bt_sock_create+0x182/0x350 net/bluetooth/af_bluetooth.c:132
 __sock_create+0x32e/0x840 net/socket.c:1576
 sock_create net/socket.c:1632 [inline]
 __sys_socket_create net/socket.c:1669 [inline]
 __sys_socket+0x14f/0x260 net/socket.c:1716
 __do_sys_socket net/socket.c:1730 [inline]
 __se_sys_socket net/socket.c:1728 [inline]
 __x64_sys_socket+0x72/0xb0 net/socket.c:1728
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 6396:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x51/0x70 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+0x14f/0x4b0 mm/slub.c:4727
 sk_prot_free net/core/sock.c:2200 [inline]
 __sk_destruct+0x5eb/0x720 net/core/sock.c:2292
 sk_destruct+0xc2/0xf0 net/core/sock.c:2307
 __sk_free+0xf4/0x3e0 net/core/sock.c:2318
 sk_free+0x6a/0x90 net/core/sock.c:2329
 sock_put include/net/sock.h:1888 [inline]
 sco_sock_kill net/bluetooth/sco.c:437 [inline]
 sco_sock_kill+0x11a/0x1c0 net/bluetooth/sco.c:427
 sco_sock_release+0x154/0x2d0 net/bluetooth/sco.c:1265
 __sock_release+0xb0/0x270 net/socket.c:658
 sock_close+0x1c/0x30 net/socket.c:1426
 __fput+0x3f6/0xb60 fs/file_table.c:431
 task_work_run+0x14e/0x250 kernel/task_work.c:239
 get_signal+0x1ca/0x2770 kernel/signal.c:2691
 arch_do_signal_or_restart+0x90/0x7e0 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:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88804ca91000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 452 bytes inside of
 freed 2048-byte region [ffff88804ca91000, ffff88804ca91800)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4ca90
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 ffff88801b042f00 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000080008 00000001f5000000 0000000000000000
head: 00fff00000000040 ffff88801b042f00 0000000000000000 dead000000000001
head: 0000000000000000 0000000000080008 00000001f5000000 0000000000000000
head: 00fff00000000003 ffffea000132a401 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 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5947, tgid 5947 (syz-executor), ts 37505778457, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1541
 prep_new_page mm/page_alloc.c:1549 [inline]
 get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3459
 __alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4735
 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265
 alloc_slab_page mm/slub.c:2412 [inline]
 allocate_slab mm/slub.c:2578 [inline]
 new_slab+0x2c9/0x410 mm/slub.c:2631
 ___slab_alloc+0xdac/0x1880 mm/slub.c:3818
 __slab_alloc.constprop.0+0x56/0xb0 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_track_caller_noprof+0x355/0x430 mm/slub.c:4283
 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:609
 pskb_expand_head+0x243/0x1260 net/core/skbuff.c:2275
 netlink_trim+0x1ef/0x250 net/netlink/af_netlink.c:1313
 netlink_broadcast_filtered+0xc7/0xef0 net/netlink/af_netlink.c:1519
 nlmsg_multicast_filtered include/net/netlink.h:1125 [inline]
 nlmsg_multicast include/net/netlink.h:1144 [inline]
 nlmsg_notify+0x9e/0x220 net/netlink/af_netlink.c:2594
 rtnl_notify net/core/rtnetlink.c:786 [inline]
 rtmsg_ifinfo_send net/core/rtnetlink.c:4128 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:4144 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:4131 [inline]
 rtnetlink_event+0x177/0x1f0 net/core/rtnetlink.c:6726
 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88804ca91080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88804ca91100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88804ca91180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff88804ca91200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88804ca91280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================