tun_chr_write_iter+0xe1/0x1e0 drivers/net/tun.c:2058 call_write_iter include/linux/fs.h:1919 [inline] new_sync_write+0x42c/0x660 fs/read_write.c:518 ====================================================== WARNING: possible circular locking dependency detected 5.10.200 #1 Not tainted ------------------------------------------------------ syz-executor.2/8986 is trying to acquire lock: ffff888019c60b78 ( (work_completion)(&hdev->bg_scan_update) vfs_write+0x747/0xa70 fs/read_write.c:605 ){+.+.}-{0:0} ksys_write+0x12d/0x260 fs/read_write.c:658 , at: __flush_work+0xdd/0xa90 kernel/workqueue.c:3050 but task is already holding lock: ffffffff85619468 ( rfkill_global_mutex do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 ){+.+.}-{3:3} entry_SYSCALL_64_after_hwframe+0x62/0xc7 , at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232 RIP: 0033:0x7f74500b65ff which lock already depends on the new lock. the existing dependency chain (in reverse order) is: Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 99 fd ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 cc fd ff ff 48 -> #4 RSP: 002b:00007f744d679150 EFLAGS: 00000293 (rfkill_global_mutex ORIG_RAX: 0000000000000001 ){+.+.}-{3:3}: RAX: ffffffffffffffda RBX: 00007f7450216f60 RCX: 00007f74500b65ff __mutex_lock_common kernel/locking/mutex.c:968 [inline] __mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109 RDX: 000000000000003a RSI: 0000000020000000 RDI: 00000000000000f0 rfkill_register+0x36/0xa10 net/rfkill/core.c:1016 hci_register_dev+0x42e/0xc00 net/bluetooth/hci_core.c:3773 RBP: 00007f744d6791d0 R08: 0000000000000000 R09: 0000000000000000 __vhci_create_device+0x2c8/0x5c0 drivers/bluetooth/hci_vhci.c:129 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 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 R13: 00007ffea493634f R14: 00007f744d679300 R15: 0000000000022000 worker_thread+0x61d/0x1310 kernel/workqueue.c:2428 kthread+0x38f/0x470 kernel/kthread.c:313 hpet: Lost 6 RTC interrupts 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:4060 hci_sched_acl_pkt net/bluetooth/hci_core.c:4585 [inline] hci_sched_acl net/bluetooth/hci_core.c:4670 [inline] hci_tx_work+0x10af/0x1660 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: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_unregister_dev+0x149/0x430 net/bluetooth/hci_core.c:3849 vhci_release+0x70/0xf0 drivers/bluetooth/hci_vhci.c:345 __fput+0x285/0x980 fs/file_table.c:281 task_work_run+0xe2/0x1a0 kernel/task_work.c:161 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xb6f/0x2600 kernel/exit.c:858 do_group_exit+0x125/0x310 kernel/exit.c:980 get_signal+0x4bc/0x22f0 kernel/signal.c:2751 arch_do_signal_or_restart+0x2b7/0x1990 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x10f/0x190 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x38/0x1e0 kernel/entry/common.c:274 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 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:3728 [inline] __lock_acquire+0x29e7/0x5b00 kernel/locking/lockdep.c:4954 lock_acquire kernel/locking/lockdep.c:5565 [inline] lock_acquire+0x197/0x470 kernel/locking/lockdep.c:5530 __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 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.2/8986: #0: ffffffff85619468 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232 stack backtrace: CPU: 1 PID: 8986 Comm: syz-executor.2 Not tainted 5.10.200 #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:3728 [inline] __lock_acquire+0x29e7/0x5b00 kernel/locking/lockdep.c:4954 lock_acquire kernel/locking/lockdep.c:5565 [inline] lock_acquire+0x197/0x470 kernel/locking/lockdep.c:5530 __flush_work+0x105/0xa90 kernel/workqueue.c:3053 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 __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: 0033:0x7f2d330deb19 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:00007f2d30654188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f2d331f1f60 RCX: 00007f2d330deb19 RDX: 0000000000000008 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007f2d33138f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffce7ec2fff R14: 00007f2d30654300 R15: 0000000000022000 CPU: 0 PID: 8994 Comm: syz-executor.7 Not tainted 5.10.200 #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:1193 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] __kmalloc+0x16e/0x390 mm/slub.c:3967 kmalloc_array include/linux/slab.h:592 [inline] genl_family_rcv_msg_attrs_parse.constprop.0+0xdb/0x280 net/netlink/genetlink.c:543 genl_family_rcv_msg_doit+0xda/0x330 net/netlink/genetlink.c:717 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:2497 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:2376 ___sys_sendmsg+0xf3/0x170 net/socket.c:2430 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2459 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x62/0xc7 RIP: 0033:0x7f2ea5d39b19 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:00007f2ea32af188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f2ea5e4cf60 RCX: 00007f2ea5d39b19 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000006 RBP: 00007f2ea32af1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd6079036f R14: 00007f2ea32af300 R15: 0000000000022000 hpet: Lost 4 RTC interrupts sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 CDB: opcode=0x9b 9b FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 9019 Comm: syz-executor.5 Not tainted 5.10.200 #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:1193 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+0x159/0x310 mm/slub.c:2909 dst_alloc+0x9e/0x610 net/core/dst.c:93 rt_dst_clone+0x59/0x860 net/ipv4/route.c:1704 ip_mc_finish_output+0x95/0x280 net/ipv4/ip_output.c:357 NF_HOOK include/linux/netfilter.h:296 [inline] NF_HOOK include/linux/netfilter.h:290 [inline] ip_mc_output+0x71c/0xa30 net/ipv4/ip_output.c:419 dst_output include/net/dst.h:436 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] ip_send_skb net/ipv4/ip_output.c:1590 [inline] ip_push_pending_frames+0x12e/0x2c0 net/ipv4/ip_output.c:1610 icmp_push_reply+0x351/0x490 net/ipv4/icmp.c:395 __icmp_send+0xbc9/0x14d0 net/ipv4/icmp.c:776 icmp_send include/net/icmp.h:43 [inline] ip_options_compile+0xad/0xf0 net/ipv4/ip_options.c:486 ip_rcv_options net/ipv4/ip_input.c:278 [inline] ip_rcv_finish_core.constprop.0+0x4fb/0x1c90 net/ipv4/ip_input.c:382 ip_rcv_finish+0x4f/0x1e0 net/ipv4/ip_input.c:438 NF_HOOK include/linux/netfilter.h:296 [inline] NF_HOOK include/linux/netfilter.h:290 [inline] ip_rcv+0xae/0xd0 net/ipv4/ip_input.c:551 __netif_receive_skb_one_core+0x19b/0x1f0 net/core/dev.c:5367 __netif_receive_skb+0x27/0x1d0 net/core/dev.c:5481 netif_receive_skb_internal net/core/dev.c:5586 [inline] netif_receive_skb+0x12d/0x710 net/core/dev.c:5645 tun_rx_batched.isra.0+0x462/0x710 drivers/net/tun.c:1563 tun_get_user+0x191d/0x32f0 drivers/net/tun.c:2025 tun_chr_write_iter+0xe1/0x1e0 drivers/net/tun.c:2058 call_write_iter include/linux/fs.h:1919 [inline] new_sync_write+0x42c/0x660 fs/read_write.c:518 vfs_write+0x747/0xa70 fs/read_write.c:605 ksys_write+0x12d/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: 0033:0x7f74500b65ff Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 99 fd ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 cc fd ff ff 48 RSP: 002b:00007f744d679150 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f7450216f60 RCX: 00007f74500b65ff RDX: 000000000000003a RSI: 0000000020000000 RDI: 00000000000000f0 RBP: 00007f744d6791d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 00007ffea493634f R14: 00007f744d679300 R15: 0000000000022000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 9026 Comm: syz-executor.5 Not tainted 5.10.200 #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:1193 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 skb_clone+0x14f/0x3d0 net/core/skbuff.c:1456 dev_queue_xmit_nit+0x3a7/0xb00 net/core/dev.c:2343 xmit_one net/core/dev.c:3587 [inline] dev_hard_start_xmit+0xab/0x6f0 net/core/dev.c:3608 sch_direct_xmit+0x25f/0x790 net/sched/sch_generic.c:336 qdisc_restart net/sched/sch_generic.c:401 [inline] __qdisc_run+0x4aa/0x1570 net/sched/sch_generic.c:409 qdisc_run include/net/pkt_sched.h:127 [inline] qdisc_run include/net/pkt_sched.h:124 [inline] __dev_xmit_skb net/core/dev.c:3784 [inline] __dev_queue_xmit+0xd99/0x2710 net/core/dev.c:4140 neigh_hh_output include/net/neighbour.h:493 [inline] neigh_output include/net/neighbour.h:507 [inline] ip_finish_output2+0x1514/0x21f0 net/ipv4/ip_output.c:237 __ip_finish_output.part.0+0x5f3/0xb50 net/ipv4/ip_output.c:315 __ip_finish_output include/linux/skbuff.h:972 [inline] ip_finish_output net/ipv4/ip_output.c:325 [inline] NF_HOOK_COND include/linux/netfilter.h:285 [inline] ip_mc_output+0x401/0xa30 net/ipv4/ip_output.c:424 dst_output include/net/dst.h:436 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] ip_send_skb net/ipv4/ip_output.c:1590 [inline] ip_push_pending_frames+0x12e/0x2c0 net/ipv4/ip_output.c:1610 icmp_push_reply+0x351/0x490 net/ipv4/icmp.c:395 __icmp_send+0xbc9/0x14d0 net/ipv4/icmp.c:776 icmp_send include/net/icmp.h:43 [inline] ip_options_compile+0xad/0xf0 net/ipv4/ip_options.c:486 ip_rcv_options net/ipv4/ip_input.c:278 [inline] ip_rcv_finish_core.constprop.0+0x4fb/0x1c90 net/ipv4/ip_input.c:382 ip_rcv_finish+0x4f/0x1e0 net/ipv4/ip_input.c:438 NF_HOOK include/linux/netfilter.h:296 [inline] NF_HOOK include/linux/netfilter.h:290 [inline] ip_rcv+0xae/0xd0 net/ipv4/ip_input.c:551 __netif_receive_skb_one_core+0x19b/0x1f0 net/core/dev.c:5367 __netif_receive_skb+0x27/0x1d0 net/core/dev.c:5481 netif_receive_skb_internal net/core/dev.c:5586 [inline] netif_receive_skb+0x12d/0x710 net/core/dev.c:5645 tun_rx_batched.isra.0+0x462/0x710 drivers/net/tun.c:1563 tun_get_user+0x191d/0x32f0 drivers/net/tun.c:2025 tun_chr_write_iter+0xe1/0x1e0 drivers/net/tun.c:2058 call_write_iter include/linux/fs.h:1919 [inline] new_sync_write+0x42c/0x660 fs/read_write.c:518 vfs_write+0x747/0xa70 fs/read_write.c:605 ksys_write+0x12d/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: 0033:0x7f74500b65ff Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 99 fd ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 cc fd ff ff 48 RSP: 002b:00007f744d679150 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f7450216f60 RCX: 00007f74500b65ff RDX: 000000000000003a RSI: 0000000020000000 RDI: 00000000000000f0 RBP: 00007f744d6791d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 00007ffea493634f R14: 00007f744d679300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 89 54 24 18 mov %edx,0x18(%rsp) 4: 48 89 74 24 10 mov %rsi,0x10(%rsp) 9: 89 7c 24 08 mov %edi,0x8(%rsp) d: e8 99 fd ff ff callq 0xfffffdab 12: 48 8b 54 24 18 mov 0x18(%rsp),%rdx 17: 48 8b 74 24 10 mov 0x10(%rsp),%rsi 1c: 41 89 c0 mov %eax,%r8d 1f: 8b 7c 24 08 mov 0x8(%rsp),%edi 23: b8 01 00 00 00 mov $0x1,%eax 28: 0f 05 syscall * 2a: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction 30: 77 31 ja 0x63 32: 44 89 c7 mov %r8d,%edi 35: 48 89 44 24 08 mov %rax,0x8(%rsp) 3a: e8 cc fd ff ff callq 0xfffffe0b 3f: 48 rex.W