======================================================
WARNING: possible circular locking dependency detected
6.10.0-syzkaller-09703-gd7e78951a8b8 #0 Not tainted
------------------------------------------------------
kworker/u9:6/17693 is trying to acquire lock:
ffff8880677c7258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1607 [inline]
ffff8880677c7258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_ready net/bluetooth/sco.c:1290 [inline]
ffff8880677c7258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_connect_cfm+0x461/0xb40 net/bluetooth/sco.c:1362

but task is already holding lock:
ffff888060fed220 (&conn->lock#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff888060fed220 (&conn->lock#2){+.+.}-{2:2}, at: sco_conn_ready net/bluetooth/sco.c:1277 [inline]
ffff888060fed220 (&conn->lock#2){+.+.}-{2:2}, at: sco_connect_cfm+0x28a/0xb40 net/bluetooth/sco.c:1362

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&conn->lock#2){+.+.}-{2:2}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
       __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:234 [inline]
       sco_connect net/bluetooth/sco.c:287 [inline]
       sco_sock_connect+0x347/0x990 net/bluetooth/sco.c:596
       __sys_connect_file net/socket.c:2061 [inline]
       __sys_connect+0x2e1/0x310 net/socket.c:2078
       __do_sys_connect net/socket.c:2088 [inline]
       __se_sys_connect net/socket.c:2085 [inline]
       __x64_sys_connect+0x7a/0x90 net/socket.c:2085
       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

-> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3133 [inline]
       check_prevs_add kernel/locking/lockdep.c:3252 [inline]
       validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868
       __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
       lock_sock_nested+0x48/0x100 net/core/sock.c:3543
       lock_sock include/net/sock.h:1607 [inline]
       sco_conn_ready net/bluetooth/sco.c:1290 [inline]
       sco_connect_cfm+0x461/0xb40 net/bluetooth/sco.c:1362
       hci_connect_cfm include/net/bluetooth/hci_core.h:1965 [inline]
       hci_sync_conn_complete_evt+0x5ad/0xaa0 net/bluetooth/hci_event.c:5008
       hci_event_func net/bluetooth/hci_event.c:7445 [inline]
       hci_event_packet+0xac4/0x1540 net/bluetooth/hci_event.c:7497
       hci_rx_work+0x3e8/0xca0 net/bluetooth/hci_core.c:4029
       process_one_work kernel/workqueue.c:3231 [inline]
       process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3312
       worker_thread+0x86d/0xd40 kernel/workqueue.c:3390
       kthread+0x2f2/0x390 kernel/kthread.c:389
       ret_from_fork+0x4d/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/u9:6/17693:
 #0: ffff88805ff55948 ((wq_completion)hci8#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
 #0: ffff88805ff55948 ((wq_completion)hci8#2){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
 #1: ffffc9000345fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
 #1: ffffc9000345fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
 #2: ffff88805118c078 (&hdev->lock){+.+.}-{3:3}, at: hci_sync_conn_complete_evt+0xb1/0xaa0 net/bluetooth/hci_event.c:4925
 #3: ffffffff8f769ee8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1962 [inline]
 #3: ffffffff8f769ee8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_sync_conn_complete_evt+0x532/0xaa0 net/bluetooth/hci_event.c:5008
 #4: ffff888060fed220 (&conn->lock#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #4: ffff888060fed220 (&conn->lock#2){+.+.}-{2:2}, at: sco_conn_ready net/bluetooth/sco.c:1277 [inline]
 #4: ffff888060fed220 (&conn->lock#2){+.+.}-{2:2}, at: sco_connect_cfm+0x28a/0xb40 net/bluetooth/sco.c:1362

stack backtrace:
CPU: 0 PID: 17693 Comm: kworker/u9:6 Not tainted 6.10.0-syzkaller-09703-gd7e78951a8b8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Workqueue: hci8 hci_rx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2186
 check_prev_add kernel/locking/lockdep.c:3133 [inline]
 check_prevs_add kernel/locking/lockdep.c:3252 [inline]
 validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868
 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
 lock_sock_nested+0x48/0x100 net/core/sock.c:3543
 lock_sock include/net/sock.h:1607 [inline]
 sco_conn_ready net/bluetooth/sco.c:1290 [inline]
 sco_connect_cfm+0x461/0xb40 net/bluetooth/sco.c:1362
 hci_connect_cfm include/net/bluetooth/hci_core.h:1965 [inline]
 hci_sync_conn_complete_evt+0x5ad/0xaa0 net/bluetooth/hci_event.c:5008
 hci_event_func net/bluetooth/hci_event.c:7445 [inline]
 hci_event_packet+0xac4/0x1540 net/bluetooth/hci_event.c:7497
 hci_rx_work+0x3e8/0xca0 net/bluetooth/hci_core.c:4029
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/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:3545
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 17693, name: kworker/u9:6
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
INFO: lockdep is turned off.
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 PID: 17693 Comm: kworker/u9:6 Not tainted 6.10.0-syzkaller-09703-gd7e78951a8b8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Workqueue: hci8 hci_rx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 __might_resched+0x5d4/0x780 kernel/sched/core.c:8437
 lock_sock_nested+0x5d/0x100 net/core/sock.c:3545
 lock_sock include/net/sock.h:1607 [inline]
 sco_conn_ready net/bluetooth/sco.c:1290 [inline]
 sco_connect_cfm+0x461/0xb40 net/bluetooth/sco.c:1362
 hci_connect_cfm include/net/bluetooth/hci_core.h:1965 [inline]
 hci_sync_conn_complete_evt+0x5ad/0xaa0 net/bluetooth/hci_event.c:5008
 hci_event_func net/bluetooth/hci_event.c:7445 [inline]
 hci_event_packet+0xac4/0x1540 net/bluetooth/hci_event.c:7497
 hci_rx_work+0x3e8/0xca0 net/bluetooth/hci_core.c:4029
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/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+0x299/0x370 kernel/locking/spinlock_debug.c:115
Read of size 4 at addr ffff8880677c71c4 by task kworker/u9:6/17693

CPU: 0 PID: 17693 Comm: kworker/u9:6 Tainted: G        W          6.10.0-syzkaller-09703-gd7e78951a8b8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Workqueue: hci8 hci_rx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 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
 debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
 do_raw_spin_lock+0x299/0x370 kernel/locking/spinlock_debug.c:115
 spin_lock_bh include/linux/spinlock.h:356 [inline]
 lock_sock_nested+0x6a/0x100 net/core/sock.c:3546
 lock_sock include/net/sock.h:1607 [inline]
 sco_conn_ready net/bluetooth/sco.c:1290 [inline]
 sco_connect_cfm+0x461/0xb40 net/bluetooth/sco.c:1362
 hci_connect_cfm include/net/bluetooth/hci_core.h:1965 [inline]
 hci_sync_conn_complete_evt+0x5ad/0xaa0 net/bluetooth/hci_event.c:5008
 hci_event_func net/bluetooth/hci_event.c:7445 [inline]
 hci_event_packet+0xac4/0x1540 net/bluetooth/hci_event.c:7497
 hci_rx_work+0x3e8/0xca0 net/bluetooth/hci_core.c:4029
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 1176:
 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:370 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:4149 [inline]
 __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4161
 kmalloc_noprof include/linux/slab.h:685 [inline]
 sk_prot_alloc+0xe0/0x210 net/core/sock.c:2096
 sk_alloc+0x38/0x370 net/core/sock.c:2149
 bt_sock_alloc+0x3c/0x340 net/bluetooth/af_bluetooth.c:148
 sco_sock_alloc net/bluetooth/sco.c:500 [inline]
 sco_sock_create+0xbb/0x390 net/bluetooth/sco.c:531
 bt_sock_create+0x163/0x230 net/bluetooth/af_bluetooth.c:132
 __sock_create+0x492/0x920 net/socket.c:1571
 sock_create net/socket.c:1622 [inline]
 __sys_socket_create net/socket.c:1659 [inline]
 __sys_socket+0x150/0x3c0 net/socket.c:1706
 __do_sys_socket net/socket.c:1720 [inline]
 __se_sys_socket net/socket.c:1718 [inline]
 __x64_sys_socket+0x7a/0x90 net/socket.c:1718
 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 1157:
 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+0xe0/0x150 mm/kasan/common.c:240
 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2235 [inline]
 slab_free mm/slub.c:4464 [inline]
 kfree+0x149/0x360 mm/slub.c:4585
 sk_prot_free net/core/sock.c:2132 [inline]
 __sk_destruct+0x476/0x5f0 net/core/sock.c:2224
 sco_sock_release+0x25e/0x320 net/bluetooth/sco.c:1259
 __sock_release net/socket.c:659 [inline]
 sock_close+0xbe/0x240 net/socket.c:1421
 __fput+0x24c/0x8a0 fs/file_table.c:422
 task_work_run+0x251/0x310 kernel/task_work.c:222
 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:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8880677c7000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 452 bytes inside of
 freed 2048-byte region [ffff8880677c7000, ffff8880677c7800)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x677c0
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: 0xffffefff(slab)
raw: 00fff00000000040 ffff888015042000 ffffea0001428c00 dead000000000002
raw: 0000000000000000 0000000000080008 00000001ffffefff 0000000000000000
head: 00fff00000000040 ffff888015042000 ffffea0001428c00 dead000000000002
head: 0000000000000000 0000000000080008 00000001ffffefff 0000000000000000
head: 00fff00000000003 ffffea00019df001 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 30635, tgid 30635 (syz-executor), ts 2284665949214, free_ts 2284640560864
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1473
 prep_new_page mm/page_alloc.c:1481 [inline]
 get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3425
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4683
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 alloc_slab_page+0x5f/0x120 mm/slub.c:2304
 allocate_slab+0x5a/0x2f0 mm/slub.c:2467
 new_slab mm/slub.c:2520 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3706
 __slab_alloc+0x58/0xa0 mm/slub.c:3796
 __slab_alloc_node mm/slub.c:3849 [inline]
 slab_alloc_node mm/slub.c:4016 [inline]
 __do_kmalloc_node mm/slub.c:4148 [inline]
 __kmalloc_node_track_caller_noprof+0x281/0x440 mm/slub.c:4168
 kmemdup_noprof+0x2a/0x60 mm/util.c:133
 ip_vs_control_net_init_sysctl net/netfilter/ipvs/ip_vs_ctl.c:4285 [inline]
 ip_vs_control_net_init+0x7da/0x17f0 net/netfilter/ipvs/ip_vs_ctl.c:4464
 __ip_vs_init+0x2d2/0x460 net/netfilter/ipvs/ip_vs_core.c:2308
 ops_init+0x35b/0x610 net/core/net_namespace.c:139
 setup_net+0x515/0xca0 net/core/net_namespace.c:343
 copy_net_ns+0x4e2/0x7b0 net/core/net_namespace.c:508
 create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
page last free pid 30635 tgid 30635 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1093 [inline]
 free_unref_page+0xd22/0xea0 mm/page_alloc.c:2588
 discard_slab mm/slub.c:2566 [inline]
 __put_partials+0xeb/0x130 mm/slub.c:3034
 put_cpu_partial+0x17c/0x250 mm/slub.c:3109
 __slab_free+0x2ea/0x3d0 mm/slub.c:4334
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x9e/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:322
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3979 [inline]
 slab_alloc_node mm/slub.c:4028 [inline]
 kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4035
 __proc_create+0x44f/0xa50 fs/proc/generic.c:425
 proc_create_reg fs/proc/generic.c:552 [inline]
 proc_create_data+0x128/0x2c0 fs/proc/generic.c:572
 nfs_net_init+0x21a/0x290 fs/nfs/inode.c:2504
 ops_init+0x35b/0x610 net/core/net_namespace.c:139
 setup_net+0x515/0xca0 net/core/net_namespace.c:343
 copy_net_ns+0x4e2/0x7b0 net/core/net_namespace.c:508
 create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228

Memory state around the buggy address:
 ffff8880677c7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880677c7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880677c7180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff8880677c7200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880677c7280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================