======================================================
WARNING: possible circular locking dependency detected
5.10.230 #1 Not tainted
------------------------------------------------------
syz-executor.4/12681 is trying to acquire lock:
ffff888017718ae8 ((work_completion)(&hdev->tx_work)){+.+.}-{0:0}, at: __flush_work+0xdd/0xa90 kernel/workqueue.c:3050

but task is already holding lock:
ffff888017718f40 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0xef/0x1240 net/bluetooth/hci_core.c:1734

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&hdev->req_lock){+.+.}-{3:3}:
       __mutex_lock_common kernel/locking/mutex.c:968 [inline]
       __mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109
       hci_dev_do_close+0xef/0x1240 net/bluetooth/hci_core.c:1734
       hci_rfkill_set_block+0x166/0x1a0 net/bluetooth/hci_core.c:2223
       rfkill_set_block+0x1fd/0x540 net/rfkill/core.c:341
       rfkill_fop_write+0x253/0x4b0 net/rfkill/core.c:1240
       vfs_write+0x29a/0xb10 fs/read_write.c:603
       ksys_write+0x1f6/0x260 fs/read_write.c:658
       do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
       entry_SYSCALL_64_after_hwframe+0x67/0xd1

-> #2 (rfkill_global_mutex){+.+.}-{3:3}:
       __mutex_lock_common kernel/locking/mutex.c:968 [inline]
       __mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109
       rfkill_register+0x36/0xa10 net/rfkill/core.c:1016
       hci_register_dev+0x42e/0xc00 net/bluetooth/hci_core.c:3774
netlink: 124 bytes leftover after parsing attributes in process `syz-executor.3'.
       __vhci_create_device+0x2c8/0x5c0 drivers/bluetooth/hci_vhci.c:129
       vhci_create_device drivers/bluetooth/hci_vhci.c:153 [inline]
       vhci_open_timeout+0x38/0x50 drivers/bluetooth/hci_vhci.c:310
       process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282
       worker_thread+0x61d/0x1310 kernel/workqueue.c:2428
       kthread+0x38f/0x470 kernel/kthread.c:328
       ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:298

-> #1 (&data->open_mutex){+.+.}-{3:3}:
       __mutex_lock_common kernel/locking/mutex.c:968 [inline]
       __mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109
       vhci_send_frame+0x63/0xa0 drivers/bluetooth/hci_vhci.c:71
       hci_send_frame+0x1b9/0x320 net/bluetooth/hci_core.c:4065
       hci_sched_acl_pkt net/bluetooth/hci_core.c:4590 [inline]
       hci_sched_acl net/bluetooth/hci_core.c:4675 [inline]
       hci_tx_work+0xfb4/0x15d0 net/bluetooth/hci_core.c:4741
       process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282
       worker_thread+0x61d/0x1310 kernel/workqueue.c:2428
       kthread+0x38f/0x470 kernel/kthread.c:328
       ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:298

-> #0 ((work_completion)(&hdev->tx_work)){+.+.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:2988 [inline]
       check_prevs_add kernel/locking/lockdep.c:3113 [inline]
       validate_chain kernel/locking/lockdep.c:3729 [inline]
       __lock_acquire+0x29e7/0x5b00 kernel/locking/lockdep.c:4955
       lock_acquire kernel/locking/lockdep.c:5566 [inline]
       lock_acquire+0x197/0x470 kernel/locking/lockdep.c:5531
       __flush_work+0x105/0xa90 kernel/workqueue.c:3053
       hci_dev_do_close+0x131/0x1240 net/bluetooth/hci_core.c:1745
       hci_rfkill_set_block+0x166/0x1a0 net/bluetooth/hci_core.c:2223
       rfkill_set_block+0x1fd/0x540 net/rfkill/core.c:341
       rfkill_fop_write+0x253/0x4b0 net/rfkill/core.c:1240
       vfs_write+0x29a/0xb10 fs/read_write.c:603
       ksys_write+0x1f6/0x260 fs/read_write.c:658
       do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
       entry_SYSCALL_64_after_hwframe+0x67/0xd1

other info that might help us debug this:

Chain exists of:
  (work_completion)(&hdev->tx_work) --> rfkill_global_mutex --> &hdev->req_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&hdev->req_lock);
                               lock(rfkill_global_mutex);
                               lock(&hdev->req_lock);
  lock((work_completion)(&hdev->tx_work));

 *** DEADLOCK ***

2 locks held by syz-executor.4/12681:
 #0: ffffffff8561e2c8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232
 #1: ffff888017718f40 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0xef/0x1240 net/bluetooth/hci_core.c:1734

stack backtrace:
CPU: 1 PID: 12681 Comm: syz-executor.4 Not tainted 5.10.230 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x167 lib/dump_stack.c:118
 check_noncircular+0x263/0x2e0 kernel/locking/lockdep.c:2123
 check_prev_add kernel/locking/lockdep.c:2988 [inline]
 check_prevs_add kernel/locking/lockdep.c:3113 [inline]
 validate_chain kernel/locking/lockdep.c:3729 [inline]
 __lock_acquire+0x29e7/0x5b00 kernel/locking/lockdep.c:4955
 lock_acquire kernel/locking/lockdep.c:5566 [inline]
 lock_acquire+0x197/0x470 kernel/locking/lockdep.c:5531
 __flush_work+0x105/0xa90 kernel/workqueue.c:3053
 hci_dev_do_close+0x131/0x1240 net/bluetooth/hci_core.c:1745
 hci_rfkill_set_block+0x166/0x1a0 net/bluetooth/hci_core.c:2223
 rfkill_set_block+0x1fd/0x540 net/rfkill/core.c:341
 rfkill_fop_write+0x253/0x4b0 net/rfkill/core.c:1240
 vfs_write+0x29a/0xb10 fs/read_write.c:603
 ksys_write+0x1f6/0x260 fs/read_write.c:658
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x67/0xd1
RIP: 0033:0x7f10cef8ab19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f10cc500188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f10cf09df60 RCX: 00007f10cef8ab19
RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 00007f10cefe4f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe365a08bf R14: 00007f10cc500300 R15: 0000000000022000
CPU: 0 PID: 12696 Comm: syz-executor.1 Not tainted 5.10.230 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x167 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 should_failslab+0x5/0x20 mm/slab_common.c:1200
 slab_pre_alloc_hook mm/slab.h:515 [inline]
 slab_alloc_node mm/slub.c:2821 [inline]
 slab_alloc mm/slub.c:2904 [inline]
 kmem_cache_alloc+0x5b/0x310 mm/slub.c:2909
 mem_pool_alloc mm/kmemleak.c:423 [inline]
 create_object.isra.0+0x3a/0xa20 mm/kmemleak.c:578
 kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
 slab_post_alloc_hook mm/slab.h:534 [inline]
 slab_alloc_node mm/slub.c:2896 [inline]
 slab_alloc mm/slub.c:2904 [inline]
 kmem_cache_alloc_trace+0x151/0x320 mm/slub.c:2921
 kmalloc include/linux/slab.h:552 [inline]
 get_mountpoint+0x14b/0x3e0 fs/namespace.c:734
 lock_mount+0xeb/0x2f0 fs/namespace.c:2237
 do_new_mount_fc fs/namespace.c:2854 [inline]
 do_new_mount fs/namespace.c:2919 [inline]
 path_mount+0x17f0/0x2120 fs/namespace.c:3247
 do_mount fs/namespace.c:3260 [inline]
 __do_sys_mount fs/namespace.c:3468 [inline]
 __se_sys_mount fs/namespace.c:3445 [inline]
 __x64_sys_mount+0x282/0x300 fs/namespace.c:3445
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x67/0xd1
RIP: 0033:0x7fb7ca991b19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb7c7ee6188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fb7caaa5020 RCX: 00007fb7ca991b19
RDX: 0000000020000040 RSI: 0000000020000080 RDI: 0000000000000000
RBP: 00007fb7c7ee61d0 R08: 0000000020000500 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fff487d7b9f R14: 00007fb7c7ee6300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 12687 Comm: syz-executor.2 Not tainted 5.10.230 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x167 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 should_failslab+0x5/0x20 mm/slab_common.c:1200
 slab_pre_alloc_hook mm/slab.h:515 [inline]
 slab_alloc_node mm/slub.c:2821 [inline]
 __kmalloc_node_track_caller+0x74/0x3b0 mm/slub.c:4496
 __kmalloc_reserve net/core/skbuff.c:143 [inline]
 __alloc_skb+0xb1/0x5b0 net/core/skbuff.c:211
 alloc_skb include/linux/skbuff.h:1099 [inline]
 nlmsg_new include/net/netlink.h:953 [inline]
 cfg80211_del_sta_sinfo+0x15e/0x470 net/wireless/nl80211.c:16517
 __sta_info_destroy_part2+0x310/0x4f0 net/mac80211/sta_info.c:1119
 __sta_info_flush+0x3a0/0x520 net/mac80211/sta_info.c:1240
 sta_info_flush net/mac80211/sta_info.h:838 [inline]
 ieee80211_del_station+0x6a/0x90 net/mac80211/cfg.c:1743
 rdev_del_station net/wireless/rdev-ops.h:201 [inline]
 nl80211_del_station+0x3f2/0x770 net/wireless/nl80211.c:6647
 genl_family_rcv_msg_doit+0x22d/0x330 net/netlink/genetlink.c:739
 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
 genl_rcv_msg+0x33c/0x5a0 net/netlink/genetlink.c:800
 netlink_rcv_skb+0x14b/0x430 net/netlink/af_netlink.c:2500
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
 netlink_unicast+0x549/0x7f0 net/netlink/af_netlink.c:1348
 netlink_sendmsg+0x90f/0xdf0 net/netlink/af_netlink.c:1916
 sock_sendmsg_nosec net/socket.c:651 [inline]
 __sock_sendmsg+0x154/0x190 net/socket.c:663
 ____sys_sendmsg+0x70d/0x870 net/socket.c:2378
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2432
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2461
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x67/0xd1
RIP: 0033:0x7fad0afe0b19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fad08556188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fad0b0f3f60 RCX: 00007fad0afe0b19
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00007fad085561d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffe4eed94bf R14: 00007fad08556300 R15: 0000000000022000
PM: hibernation: Marking nosave pages: [mem 0x00000000-0x00000fff]
PM: hibernation: Marking nosave pages: [mem 0x0009f000-0x000fffff]
PM: hibernation: Basic memory bitmaps created
platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
PM: hibernation: Basic memory bitmaps freed
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 12732 Comm: syz-executor.1 Not tainted 5.10.230 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x167 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 should_failslab+0x5/0x20 mm/slab_common.c:1200
 slab_pre_alloc_hook mm/slab.h:515 [inline]
 slab_alloc_node mm/slub.c:2821 [inline]
 slab_alloc mm/slub.c:2904 [inline]
 kmem_cache_alloc_trace+0x55/0x320 mm/slub.c:2921
 kmalloc include/linux/slab.h:552 [inline]
 get_mountpoint+0x14b/0x3e0 fs/namespace.c:734
 lock_mount+0xeb/0x2f0 fs/namespace.c:2237
 do_new_mount_fc fs/namespace.c:2854 [inline]
 do_new_mount fs/namespace.c:2919 [inline]
 path_mount+0x17f0/0x2120 fs/namespace.c:3247
 do_mount fs/namespace.c:3260 [inline]
 __do_sys_mount fs/namespace.c:3468 [inline]
 __se_sys_mount fs/namespace.c:3445 [inline]
 __x64_sys_mount+0x282/0x300 fs/namespace.c:3445
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x67/0xd1
RIP: 0033:0x7fb7ca991b19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb7c7f07188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fb7caaa4f60 RCX: 00007fb7ca991b19
RDX: 0000000020000040 RSI: 0000000020000080 RDI: 0000000000000000
RBP: 00007fb7c7f071d0 R08: 0000000020000500 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fff487d7b9f R14: 00007fb7c7f07300 R15: 0000000000022000
netlink: 124 bytes leftover after parsing attributes in process `syz-executor.3'.
PM: hibernation: Marking nosave pages: [mem 0x00000000-0x00000fff]
PM: hibernation: Marking nosave pages: [mem 0x0009f000-0x000fffff]
PM: hibernation: Basic memory bitmaps created
platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
PM: hibernation: Basic memory bitmaps freed