nci: __nci_request: wait_for_completion_interruptible_timeout failed -512 nci: nci_start_poll: failed to set local general bytes nci: __nci_request: wait_for_completion_interruptible_timeout failed 0 ====================================================== WARNING: possible circular locking dependency detected 6.1.55-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor990/3554 is trying to acquire lock: ffffffff8d9d1d48 (nci_mutex){+.+.}-{3:3}, at: virtual_nci_close+0x13/0x40 drivers/nfc/virtual_ncidev.c:44 but task is already holding lock: ffff8880176c3350 (&ndev->req_lock){+.+.}-{3:3}, at: nci_close_device+0x106/0x5f0 net/nfc/nci/core.c:560 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&ndev->req_lock){+.+.}-{3:3}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5661 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 nci_request net/nfc/nci/core.c:148 [inline] nci_set_local_general_bytes net/nfc/nci/core.c:774 [inline] nci_start_poll+0x59f/0xf20 net/nfc/nci/core.c:838 nfc_start_poll+0x184/0x2f0 net/nfc/core.c:225 nfc_genl_start_poll+0x1e7/0x350 net/nfc/netlink.c:828 genl_family_rcv_msg_doit net/netlink/genetlink.c:756 [inline] genl_family_rcv_msg net/netlink/genetlink.c:833 [inline] genl_rcv_msg+0xc1a/0xf70 net/netlink/genetlink.c:850 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2495 genl_rcv+0x24/0x40 net/netlink/genetlink.c:861 netlink_unicast_kernel net/netlink/af_netlink.c:1326 [inline] netlink_unicast+0x7d8/0x970 net/netlink/af_netlink.c:1352 netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1874 sock_sendmsg_nosec net/socket.c:716 [inline] sock_sendmsg net/socket.c:736 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2482 ___sys_sendmsg net/socket.c:2536 [inline] __sys_sendmsg+0x2a9/0x390 net/socket.c:2565 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #2 (&genl_data->genl_data_mutex){+.+.}-{3:3}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5661 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 nfc_urelease_event_work+0x113/0x2f0 net/nfc/netlink.c:1849 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 -> #1 (nfc_devlist_mutex){+.+.}-{3:3}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5661 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 nfc_register_device+0x38/0x310 net/nfc/core.c:1116 nci_register_device+0x7be/0x900 net/nfc/nci/core.c:1256 virtual_ncidev_open+0x55/0xc0 drivers/nfc/virtual_ncidev.c:146 misc_open+0x304/0x380 drivers/char/misc.c:143 chrdev_open+0x54a/0x630 fs/char_dev.c:414 do_dentry_open+0x7f9/0x10f0 fs/open.c:882 do_open fs/namei.c:3557 [inline] path_openat+0x2644/0x2e60 fs/namei.c:3714 do_filp_open+0x230/0x480 fs/namei.c:3741 do_sys_openat2+0x13b/0x500 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1345 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (nci_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1667/0x58e0 kernel/locking/lockdep.c:3824 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5048 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5661 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 virtual_nci_close+0x13/0x40 drivers/nfc/virtual_ncidev.c:44 nci_close_device+0x3a8/0x5f0 net/nfc/nci/core.c:592 nci_unregister_device+0x3c/0x230 net/nfc/nci/core.c:1291 virtual_ncidev_close+0x55/0x90 drivers/nfc/virtual_ncidev.c:166 __fput+0x3b7/0x890 fs/file_table.c:320 task_work_run+0x246/0x300 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa73/0x26a0 kernel/exit.c:869 do_group_exit+0x202/0x2b0 kernel/exit.c:1019 get_signal+0x16f7/0x17d0 kernel/signal.c:2862 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Chain exists of: nci_mutex --> &genl_data->genl_data_mutex --> &ndev->req_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ndev->req_lock); lock(&genl_data->genl_data_mutex); lock(&ndev->req_lock); lock(nci_mutex); *** DEADLOCK *** 1 lock held by syz-executor990/3554: #0: ffff8880176c3350 (&ndev->req_lock){+.+.}-{3:3}, at: nci_close_device+0x106/0x5f0 net/nfc/nci/core.c:560 stack backtrace: CPU: 1 PID: 3554 Comm: syz-executor990 Not tainted 6.1.55-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1667/0x58e0 kernel/locking/lockdep.c:3824 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5048 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5661 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 virtual_nci_close+0x13/0x40 drivers/nfc/virtual_ncidev.c:44 nci_close_device+0x3a8/0x5f0 net/nfc/nci/core.c:592 nci_unregister_device+0x3c/0x230 net/nfc/nci/core.c:1291 virtual_ncidev_close+0x55/0x90 drivers/nfc/virtual_ncidev.c:166 __fput+0x3b7/0x890 fs/file_table.c:320 task_work_run+0x246/0x300 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa73/0x26a0 kernel/exit.c:869 do_group_exit+0x202/0x2b0 kernel/exit.c:1019 get_signal+0x16f7/0x17d0 kernel/signal.c:2862 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fc2d9170509 Code: Unable to access opcode bytes at 0x7fc2d91704df. RSP: 002b:00007fc2d910f238 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: 0000000000000024 RBX: 00007fc2d91fa378 RCX: 00007fc2d9170509 RDX: 0000000000000000 RSI: 0000000020000440 RDI: 0000000000000004 RBP: 00007fc2d91fa370 R08: 0000000000000003 R09: 00007fc2d910f6c0 R10: 0000000000000008 R11: 0000000000000246 R12: 00007fc2d91c7074 R13: 000000000000006e R14: 00007fff0d90c970 R15: 00007fff0d90ca58