audit: type=1400 audit(1713338078.670:245): avc: denied { block_suspend } for pid=14824 comm="syz-executor.5" capability=36 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 ====================================================== WARNING: possible circular locking dependency detected 5.10.215 #1 Not tainted ------------------------------------------------------ syz-executor.7/14827 is trying to acquire lock: ffff888017d24b78 ((work_completion)(&hdev->bg_scan_update)){+.+.}-{0:0}, at: __flush_work+0xdd/0xa90 kernel/workqueue.c:3050 but task is already holding lock: ffffffff8561aca8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (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 __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:313 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:299 -> #3 (&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:4061 hci_sched_acl_pkt net/bluetooth/hci_core.c:4586 [inline] hci_sched_acl net/bluetooth/hci_core.c:4671 [inline] hci_tx_work+0x10af/0x1660 net/bluetooth/hci_core.c:4742 process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282 worker_thread+0x61d/0x1310 kernel/workqueue.c:2428 kthread+0x38f/0x470 kernel/kthread.c:313 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:299 -> #2 ((work_completion)(&hdev->tx_work)){+.+.}-{0:0}: __flush_work+0x105/0xa90 kernel/workqueue.c:3053 hci_dev_do_close+0x131/0x1240 net/bluetooth/hci_core.c:1745 hci_dev_close+0x175/0x1d0 net/bluetooth/hci_core.c:1865 hci_sock_ioctl+0x288/0x980 net/bluetooth/hci_sock.c:1067 sock_do_ioctl+0xd3/0x300 net/socket.c:1066 sock_ioctl+0x3ea/0x700 net/socket.c:1206 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x19a/0x210 fs/ioctl.c:739 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xcc -> #1 (&hdev->req_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:968 [inline] __mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109 hci_req_sync net/bluetooth/hci_request.c:275 [inline] bg_scan_update+0x82/0x500 net/bluetooth/hci_request.c:2895 process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282 worker_thread+0x61d/0x1310 kernel/workqueue.c:2428 kthread+0x38f/0x470 kernel/kthread.c:313 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:299 -> #0 ((work_completion)(&hdev->bg_scan_update)){+.+.}-{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 __cancel_work_timer+0x368/0x4c0 kernel/workqueue.c:3144 hci_request_cancel_all+0x73/0x230 net/bluetooth/hci_request.c:3438 hci_dev_do_close+0xd9/0x1240 net/bluetooth/hci_core.c:1733 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/0xa70 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+0x67/0xcc other info that might help us debug this: Chain exists of: (work_completion)(&hdev->bg_scan_update) --> &data->open_mutex --> rfkill_global_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rfkill_global_mutex); lock(&data->open_mutex); lock(rfkill_global_mutex); lock((work_completion)(&hdev->bg_scan_update)); *** DEADLOCK *** 1 lock held by syz-executor.7/14827: #0: ffffffff8561aca8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232 stack backtrace: CPU: 0 PID: 14827 Comm: syz-executor.7 Not tainted 5.10.215 #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 __cancel_work_timer+0x368/0x4c0 kernel/workqueue.c:3144 hci_request_cancel_all+0x73/0x230 net/bluetooth/hci_request.c:3438 hci_dev_do_close+0xd9/0x1240 net/bluetooth/hci_core.c:1733 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/0xa70 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+0x67/0xcc RIP: 0033:0x7f5647780b19 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:00007f5644cf6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f5647893f60 RCX: 00007f5647780b19 RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000007 RBP: 00007f56477daf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff378530df R14: 00007f5644cf6300 R15: 0000000000022000 FAULT_INJECTION: forcing a failure. name fail_page_alloc, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 15076 Comm: syz-executor.4 Not tainted 5.10.215 #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 prepare_alloc_pages mm/page_alloc.c:4941 [inline] __alloc_pages_nodemask+0x182/0x600 mm/page_alloc.c:4983 alloc_pages_vma+0xbb/0x410 mm/mempolicy.c:2229 alloc_zeroed_user_highpage_movable include/linux/highmem.h:277 [inline] do_anonymous_page mm/memory.c:3607 [inline] handle_pte_fault mm/memory.c:4467 [inline] __handle_mm_fault mm/memory.c:4604 [inline] handle_mm_fault+0x152f/0x3500 mm/memory.c:4702 do_user_addr_fault+0x56e/0xc60 arch/x86/mm/fault.c:1370 handle_page_fault arch/x86/mm/fault.c:1427 [inline] exc_page_fault+0xa2/0x1a0 arch/x86/mm/fault.c:1483 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571 RIP: 0010:__clear_user+0x40/0x70 arch/x86/lib/usercopy_64.c:24 Code: 7b 5d 84 e8 22 f0 5c ff 0f 01 cb 48 89 d8 48 c1 eb 03 48 89 ef 83 e0 07 48 89 d9 48 85 c9 74 19 66 2e 0f 1f 84 00 00 00 00 00 <48> c7 07 00 00 00 00 48 83 c7 08 ff c9 75 f1 48 89 c1 85 c9 74 0a RSP: 0018:ffff88805b8179e0 EFLAGS: 00050202 RAX: 0000000000000000 RBX: 0000000000000200 RCX: 00000000000001a8 RDX: 0000000000040000 RSI: ffffffff82028cce RDI: 0000000020062000 RBP: 0000000020061d40 R08: 0000000000000000 R09: ffffffff85673e0f R10: 0000000000000000 R11: 0000000000000001 R12: 0000000020061d40 R13: 00007ffffffff000 R14: 0000000000000000 R15: 0000000000001000 clear_user+0xf3/0x130 arch/x86/lib/usercopy_64.c:54 iov_iter_zero+0x216/0xef0 lib/iov_iter.c:975 read_iter_zero+0x10f/0x240 drivers/char/mem.c:718 call_read_iter include/linux/fs.h:1958 [inline] do_iter_readv_writev+0x57c/0x750 fs/read_write.c:738 do_iter_read+0x28f/0x6d0 fs/read_write.c:801 vfs_readv+0xe5/0x160 fs/read_write.c:921 do_preadv fs/read_write.c:1013 [inline] __do_sys_preadv fs/read_write.c:1063 [inline] __se_sys_preadv fs/read_write.c:1058 [inline] __x64_sys_preadv+0x235/0x310 fs/read_write.c:1058 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xcc RIP: 0033:0x7f5607704b19 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:00007f5604c7a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00007f5607817f60 RCX: 00007f5607704b19 RDX: 0000000000000001 RSI: 0000000020001400 RDI: 0000000000000003 RBP: 00007f5604c7a1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffe4e09bd2f R14: 00007f5604c7a300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 7b 5d jnp 0x5f 2: 84 e8 test %ch,%al 4: 22 f0 and %al,%dh 6: 5c pop %rsp 7: ff 0f decl (%rdi) 9: 01 cb add %ecx,%ebx b: 48 89 d8 mov %rbx,%rax e: 48 c1 eb 03 shr $0x3,%rbx 12: 48 89 ef mov %rbp,%rdi 15: 83 e0 07 and $0x7,%eax 18: 48 89 d9 mov %rbx,%rcx 1b: 48 85 c9 test %rcx,%rcx 1e: 74 19 je 0x39 20: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 27: 00 00 00 * 2a: 48 c7 07 00 00 00 00 movq $0x0,(%rdi) <-- trapping instruction 31: 48 83 c7 08 add $0x8,%rdi 35: ff c9 dec %ecx 37: 75 f1 jne 0x2a 39: 48 89 c1 mov %rax,%rcx 3c: 85 c9 test %ecx,%ecx 3e: 74 0a je 0x4a