======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc5-syzkaller-00234-gb7c90e3e717a #0 Not tainted
------------------------------------------------------
kworker/u33:4/5953 is trying to acquire lock:
ffff888024e54258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1624 [inline]
ffff888024e54258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_ready net/bluetooth/sco.c:1341 [inline]
ffff888024e54258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_connect_cfm+0x3bc/0xc00 net/bluetooth/sco.c:1415

but task is already holding lock:
ffff8880512c3420 (&conn->lock#3){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff8880512c3420 (&conn->lock#3){+.+.}-{3:3}, at: sco_conn_ready net/bluetooth/sco.c:1328 [inline]
ffff8880512c3420 (&conn->lock#3){+.+.}-{3:3}, at: sco_connect_cfm+0x29f/0xc00 net/bluetooth/sco.c:1415

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&conn->lock#3){+.+.}-{3:3}:
       __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:292 [inline]
       sco_connect net/bluetooth/sco.c:348 [inline]
       sco_sock_connect+0x3b2/0xcc0 net/bluetooth/sco.c:648
       __sys_connect_file+0x13e/0x1a0 net/socket.c:2045
       __sys_connect+0x14f/0x170 net/socket.c:2064
       __do_sys_connect net/socket.c:2070 [inline]
       __se_sys_connect net/socket.c:2067 [inline]
       __ia32_sys_connect+0x71/0xb0 net/socket.c:2067
       do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
       __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:387
       do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:412
       entry_SYSENTER_compat_after_hwframe+0x84/0x8e

-> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3163 [inline]
       check_prevs_add kernel/locking/lockdep.c:3282 [inline]
       validate_chain kernel/locking/lockdep.c:3906 [inline]
       __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5228
       lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
       lock_sock_nested+0x3a/0xf0 net/core/sock.c:3662
       lock_sock include/net/sock.h:1624 [inline]
       sco_conn_ready net/bluetooth/sco.c:1341 [inline]
       sco_connect_cfm+0x3bc/0xc00 net/bluetooth/sco.c:1415
       hci_connect_cfm include/net/bluetooth/hci_core.h:2051 [inline]
       hci_sync_conn_complete_evt+0x421/0xa80 net/bluetooth/hci_event.c:5014
       hci_event_func net/bluetooth/hci_event.c:7473 [inline]
       hci_event_packet+0x9eb/0x1180 net/bluetooth/hci_event.c:7525
       hci_rx_work+0x2c5/0x16b0 net/bluetooth/hci_core.c:4015
       process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238
       process_scheduled_works kernel/workqueue.c:3319 [inline]
       worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400
       kthread+0x3af/0x750 kernel/kthread.c:464
       ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
       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#3);
                               lock(sk_lock-AF_BLUETOOTH-BTPROTO_SCO);
                               lock(&conn->lock#3);
  lock(sk_lock-AF_BLUETOOTH-BTPROTO_SCO);

 *** DEADLOCK ***

4 locks held by kworker/u33:4/5953:
 #0: ffff888020229948 ((wq_completion)hci1#2){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
 #1: ffffc900041d7d18 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
 #2: ffff888012da0078 (&hdev->lock){+.+.}-{4:4}, at: hci_sync_conn_complete_evt+0x199/0xa80 net/bluetooth/hci_event.c:4931
 #3: ffff8880512c3420 (&conn->lock#3){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #3: ffff8880512c3420 (&conn->lock#3){+.+.}-{3:3}, at: sco_conn_ready net/bluetooth/sco.c:1328 [inline]
 #3: ffff8880512c3420 (&conn->lock#3){+.+.}-{3:3}, at: sco_connect_cfm+0x29f/0xc00 net/bluetooth/sco.c:1415

stack backtrace:
CPU: 0 UID: 0 PID: 5953 Comm: kworker/u33:4 Not tainted 6.14.0-rc5-syzkaller-00234-gb7c90e3e717a #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: hci1 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+0x490/0x760 kernel/locking/lockdep.c:2076
 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2208
 check_prev_add kernel/locking/lockdep.c:3163 [inline]
 check_prevs_add kernel/locking/lockdep.c:3282 [inline]
 validate_chain kernel/locking/lockdep.c:3906 [inline]
 __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5228
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
 lock_sock_nested+0x3a/0xf0 net/core/sock.c:3662
 lock_sock include/net/sock.h:1624 [inline]
 sco_conn_ready net/bluetooth/sco.c:1341 [inline]
 sco_connect_cfm+0x3bc/0xc00 net/bluetooth/sco.c:1415
 hci_connect_cfm include/net/bluetooth/hci_core.h:2051 [inline]
 hci_sync_conn_complete_evt+0x421/0xa80 net/bluetooth/hci_event.c:5014
 hci_event_func net/bluetooth/hci_event.c:7473 [inline]
 hci_event_packet+0x9eb/0x1180 net/bluetooth/hci_event.c:7525
 hci_rx_work+0x2c5/0x16b0 net/bluetooth/hci_core.c:4015
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 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:3664
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5953, name: kworker/u33:4
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
INFO: lockdep is turned off.
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 UID: 0 PID: 5953 Comm: kworker/u33:4 Not tainted 6.14.0-rc5-syzkaller-00234-gb7c90e3e717a #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: hci1 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:8767
 lock_sock_nested+0x4b/0xf0 net/core/sock.c:3664
 lock_sock include/net/sock.h:1624 [inline]
 sco_conn_ready net/bluetooth/sco.c:1341 [inline]
 sco_connect_cfm+0x3bc/0xc00 net/bluetooth/sco.c:1415
 hci_connect_cfm include/net/bluetooth/hci_core.h:2051 [inline]
 hci_sync_conn_complete_evt+0x421/0xa80 net/bluetooth/hci_event.c:5014
 hci_event_func net/bluetooth/hci_event.c:7473 [inline]
 hci_event_packet+0x9eb/0x1180 net/bluetooth/hci_event.c:7525
 hci_rx_work+0x2c5/0x16b0 net/bluetooth/hci_core.c:4015
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 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 ffff888024e541c4 by task kworker/u33:4/5953

CPU: 0 UID: 0 PID: 5953 Comm: kworker/u33:4 Tainted: G        W          6.14.0-rc5-syzkaller-00234-gb7c90e3e717a #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: hci1 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:408 [inline]
 print_report+0xc3/0x670 mm/kasan/report.c:521
 kasan_report+0xd9/0x110 mm/kasan/report.c:634
 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:3665
 lock_sock include/net/sock.h:1624 [inline]
 sco_conn_ready net/bluetooth/sco.c:1341 [inline]
 sco_connect_cfm+0x3bc/0xc00 net/bluetooth/sco.c:1415
 hci_connect_cfm include/net/bluetooth/hci_core.h:2051 [inline]
 hci_sync_conn_complete_evt+0x421/0xa80 net/bluetooth/hci_event.c:5014
 hci_event_func net/bluetooth/hci_event.c:7473 [inline]
 hci_event_packet+0x9eb/0x1180 net/bluetooth/hci_event.c:7525
 hci_rx_work+0x2c5/0x16b0 net/bluetooth/hci_core.c:4015
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 19346:
 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:260 [inline]
 __do_kmalloc_node mm/slub.c:4294 [inline]
 __kmalloc_noprof+0x21c/0x510 mm/slub.c:4306
 kmalloc_noprof include/linux/slab.h:905 [inline]
 sk_prot_alloc+0x1a8/0x2a0 net/core/sock.c:2181
 sk_alloc+0x36/0xc20 net/core/sock.c:2234
 bt_sock_alloc+0x3b/0x3a0 net/bluetooth/af_bluetooth.c:148
 sco_sock_alloc net/bluetooth/sco.c:552 [inline]
 sco_sock_create+0xe3/0x3c0 net/bluetooth/sco.c:583
 bt_sock_create+0x182/0x350 net/bluetooth/af_bluetooth.c:132
 __sock_create+0x335/0x8d0 net/socket.c:1548
 sock_create net/socket.c:1606 [inline]
 __sys_socket_create net/socket.c:1643 [inline]
 __sys_socket+0x14f/0x260 net/socket.c:1690
 __do_sys_socket net/socket.c:1704 [inline]
 __se_sys_socket net/socket.c:1702 [inline]
 __ia32_sys_socket+0x72/0xb0 net/socket.c:1702
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:387
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:412
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Freed by task 19345:
 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:576
 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:233 [inline]
 slab_free_hook mm/slub.c:2353 [inline]
 slab_free mm/slub.c:4609 [inline]
 kfree+0x2c4/0x4d0 mm/slub.c:4757
 sk_prot_free net/core/sock.c:2217 [inline]
 __sk_destruct+0x5ef/0x6f0 net/core/sock.c:2312
 sk_destruct+0xc2/0xf0 net/core/sock.c:2340
 __sk_free+0xf4/0x3e0 net/core/sock.c:2351
 sk_free+0x6a/0x90 net/core/sock.c:2362
 sock_put include/net/sock.h:1914 [inline]
 sco_sock_kill net/bluetooth/sco.c:494 [inline]
 sco_sock_kill+0x11a/0x1c0 net/bluetooth/sco.c:484
 sco_sock_release+0x154/0x2d0 net/bluetooth/sco.c:1310
 __sock_release+0xb0/0x270 net/socket.c:647
 sock_close+0x1c/0x30 net/socket.c:1398
 __fput+0x3ff/0xb70 fs/file_table.c:464
 task_work_run+0x14e/0x250 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x27b/0x2a0 kernel/entry/common.c:218
 __do_fast_syscall_32+0x80/0x120 arch/x86/entry/common.c:390
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:412
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

The buggy address belongs to the object at ffff888024e54000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 452 bytes inside of
 freed 2048-byte region [ffff888024e54000, ffff888024e54800)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24e50
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 ffff88801b042f00 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b042f00 dead000000000100 dead000000000122
head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0000939401 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 15337, tgid 15329 (syz.4.2373), ts 569331576175, free_ts 569323404778
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1551
 prep_new_page mm/page_alloc.c:1559 [inline]
 get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3477
 __alloc_frozen_pages_noprof+0x221/0x2470 mm/page_alloc.c:4739
 alloc_pages_mpol+0x1fc/0x540 mm/mempolicy.c:2270
 alloc_slab_page mm/slub.c:2423 [inline]
 allocate_slab mm/slub.c:2587 [inline]
 new_slab+0x23d/0x330 mm/slub.c:2640
 ___slab_alloc+0xc5d/0x1720 mm/slub.c:3826
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3916
 __slab_alloc_node mm/slub.c:3991 [inline]
 slab_alloc_node mm/slub.c:4152 [inline]
 __kmalloc_cache_noprof+0xfa/0x410 mm/slub.c:4320
 kmalloc_noprof include/linux/slab.h:901 [inline]
 kzalloc_noprof include/linux/slab.h:1037 [inline]
 copy_verifier_state kernel/bpf/verifier.c:1667 [inline]
 copy_verifier_state+0xad7/0xe70 kernel/bpf/verifier.c:1635
 push_stack+0x1d9/0x550 kernel/bpf/verifier.c:1935
 check_cond_jmp_op+0xb56/0x7a80 kernel/bpf/verifier.c:16101
 do_check kernel/bpf/verifier.c:19252 [inline]
 do_check_common+0x7c17/0xb960 kernel/bpf/verifier.c:22273
 do_check_main kernel/bpf/verifier.c:22364 [inline]
 bpf_check+0x77f7/0xb330 kernel/bpf/verifier.c:23160
 bpf_prog_load+0xe3c/0x2480 kernel/bpf/syscall.c:2952
 __sys_bpf+0x4043/0x49c0 kernel/bpf/syscall.c:5795
 __do_sys_bpf kernel/bpf/syscall.c:5902 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5900 [inline]
 __ia32_sys_bpf+0x76/0xe0 kernel/bpf/syscall.c:5900
page last free pid 15337 tgid 15329 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_frozen_pages+0x6db/0xfb0 mm/page_alloc.c:2660
 __put_partials+0x14c/0x170 mm/slub.c:3153
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4115 [inline]
 slab_alloc_node mm/slub.c:4164 [inline]
 __kmalloc_cache_noprof+0x243/0x410 mm/slub.c:4320
 kmalloc_noprof include/linux/slab.h:901 [inline]
 kzalloc_noprof include/linux/slab.h:1037 [inline]
 push_stack+0x7c/0x550 kernel/bpf/verifier.c:1925
 check_cond_jmp_op+0xb56/0x7a80 kernel/bpf/verifier.c:16101
 do_check kernel/bpf/verifier.c:19252 [inline]
 do_check_common+0x7c17/0xb960 kernel/bpf/verifier.c:22273
 do_check_main kernel/bpf/verifier.c:22364 [inline]
 bpf_check+0x77f7/0xb330 kernel/bpf/verifier.c:23160
 bpf_prog_load+0xe3c/0x2480 kernel/bpf/syscall.c:2952
 __sys_bpf+0x4043/0x49c0 kernel/bpf/syscall.c:5795
 __do_sys_bpf kernel/bpf/syscall.c:5902 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5900 [inline]
 __ia32_sys_bpf+0x76/0xe0 kernel/bpf/syscall.c:5900
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:387
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:412
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Memory state around the buggy address:
 ffff888024e54080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888024e54100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888024e54180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff888024e54200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888024e54280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================