audit: type=1326 audit(1711563248.116:279): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=10215 comm="syz-executor.3" exe="/syz-executor.3" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f8f0acc7b19 code=0x7ffc0000 ====================================================== WARNING: possible circular locking dependency detected 5.10.213 #1 Not tainted ------------------------------------------------------ syz-executor.7/10224 is trying to acquire lock: ffff888018360b78 ((work_completion)(&hdev->bg_scan_update)){+.+.}-{0:0}, at: __flush_work+0xdd/0xa90 kernel/workqueue.c:3050 but task is already holding lock: ffffffff8561a868 (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}: audit: type=1326 audit(1711563248.116:280): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=10215 comm="syz-executor.3" exe="/syz-executor.3" sig=0 arch=c000003e syscall=319 compat=0 ip=0x7f8f0acc7b19 code=0x7ffc0000 __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+0x62/0xc7 -> #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 FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 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 CPU: 0 PID: 10219 Comm: syz-executor.1 Not tainted 5.10.213 #1 __flush_work+0x105/0xa90 kernel/workqueue.c:3053 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 __cancel_work_timer+0x368/0x4c0 kernel/workqueue.c:3144 Call Trace: hci_request_cancel_all+0x73/0x230 net/bluetooth/hci_request.c:3438 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x167 lib/dump_stack.c:118 hci_dev_do_close+0xd9/0x1240 net/bluetooth/hci_core.c:1733 fail_dump lib/fault-inject.c:52 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:146 hci_rfkill_set_block+0x166/0x1a0 net/bluetooth/hci_core.c:2223 copyin lib/iov_iter.c:155 [inline] _copy_from_iter_full+0x201/0xa60 lib/iov_iter.c:785 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 copy_from_iter_full include/linux/uio.h:169 [inline] memcpy_from_msg include/linux/skbuff.h:3606 [inline] netlink_sendmsg+0x879/0xdf0 net/netlink/af_netlink.c:1901 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+0x62/0xc7 sock_sendmsg_nosec net/socket.c:651 [inline] __sock_sendmsg+0x154/0x190 net/socket.c:663 other info that might help us debug this: ____sys_sendmsg+0x70d/0x870 net/socket.c:2378 Chain exists of: (work_completion)(&hdev->bg_scan_update) --> &data->open_mutex --> rfkill_global_mutex ___sys_sendmsg+0xf3/0x170 net/socket.c:2432 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock( rfkill_global_mutex ); __sys_sendmsg+0xe5/0x1b0 net/socket.c:2461 lock( &data->open_mutex ); lock( rfkill_global_mutex do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 ); entry_SYSCALL_64_after_hwframe+0x62/0xc7 lock( RIP: 0033:0x7f3612c64b19 (work_completion)(&hdev->bg_scan_update) 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:00007f36101da188 EFLAGS: 00000246 *** DEADLOCK *** ORIG_RAX: 000000000000002e 1 lock held by syz-executor.7/10224: RAX: ffffffffffffffda RBX: 00007f3612d77f60 RCX: 00007f3612c64b19 #0: RDX: 0000000000000000 RSI: 0000000020000840 RDI: 0000000000000006 ffffffff8561a868 RBP: 00007f36101da1d0 R08: 0000000000000000 R09: 0000000000000000 ( R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 rfkill_global_mutex R13: 00007fff733ed4af R14: 00007f36101da300 R15: 0000000000022000 ){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232 audit: type=1326 audit(1711563248.116:281): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=10215 comm="syz-executor.3" exe="/syz-executor.3" sig=0 arch=c000003e syscall=77 compat=0 ip=0x7f8f0acc7ad7 code=0x7ffc0000 stack backtrace: CPU: 1 PID: 10224 Comm: syz-executor.7 Not tainted 5.10.213 #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 audit: type=1326 audit(1711563248.117:282): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=10215 comm="syz-executor.3" exe="/syz-executor.3" sig=0 arch=c000003e syscall=18 compat=0 ip=0x7f8f0ac7aab7 code=0x7ffc0000 audit: type=1326 audit(1711563248.117:283): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=10215 comm="syz-executor.3" exe="/syz-executor.3" sig=0 arch=c000003e syscall=257 compat=0 ip=0x7f8f0ac7aa04 code=0x7ffc0000 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+0x62/0xc7 RIP: 0033:0x7fa3dbd31b19 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:00007fa3d92a7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa3dbe44f60 RCX: 00007fa3dbd31b19 RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00007fa3dbd8bf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe374de0af R14: 00007fa3d92a7300 R15: 0000000000022000 audit: type=1326 audit(1711563248.287:284): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=10215 comm="syz-executor.3" exe="/syz-executor.3" sig=0 arch=c000003e syscall=16 compat=0 ip=0x7f8f0acc78d7 code=0x7ffc0000 audit: type=1326 audit(1711563248.309:285): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=10215 comm="syz-executor.3" exe="/syz-executor.3" sig=0 arch=c000003e syscall=83 compat=0 ip=0x7f8f0acc6c27 code=0x7ffc0000 audit: type=1326 audit(1711563248.310:286): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=10215 comm="syz-executor.3" exe="/syz-executor.3" sig=0 arch=c000003e syscall=165 compat=0 ip=0x7f8f0acc904a code=0x7ffc0000 FAT-fs (loop3): Unrecognized mount option "dont_measure" or missing value EXT4-fs (loop5): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock EXT4-fs (loop5): group descriptors corrupted! rfkill: input handler disabled EXT4-fs error (device loop6): ext4_fill_super:4962: inode #2: comm syz-executor.6: iget: special inode unallocated EXT4-fs (loop6): get root inode failed EXT4-fs (loop6): mount failed FAT-fs (loop3): Unrecognized mount option "dont_measure" or missing value rfkill: input handler enabled rfkill: input handler disabled rfkill: input handler enabled ---------------- Code disassembly (best guess), 1 bytes skipped: 0: ff c3 inc %ebx 2: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 9: 00 00 00 c: 0f 1f 40 00 nopl 0x0(%rax) 10: 48 89 f8 mov %rdi,%rax 13: 48 89 f7 mov %rsi,%rdi 16: 48 89 d6 mov %rdx,%rsi 19: 48 89 ca mov %rcx,%rdx 1c: 4d 89 c2 mov %r8,%r10 1f: 4d 89 c8 mov %r9,%r8 22: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 27: 0f 05 syscall * 29: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 2f: 73 01 jae 0x32 31: c3 retq 32: 48 c7 c1 bc ff ff ff mov $0xffffffffffffffbc,%rcx 39: f7 d8 neg %eax 3b: 64 89 01 mov %eax,%fs:(%rcx) 3e: 48 rex.W