INFO: task syz-executor577:8449 blocked for more than 143 seconds. Not tainted 5.14.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor577 state:D stack:25264 pid: 8449 ppid: 8445 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0xc07/0x11f0 kernel/sched/core.c:5938 schedule+0x14b/0x210 kernel/sched/core.c:6017 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6076 __mutex_lock_common+0x116f/0x3770 kernel/locking/mutex.c:1036 __mutex_lock kernel/locking/mutex.c:1104 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1119 misc_open+0x57/0x3c0 drivers/char/misc.c:107 chrdev_open+0x53b/0x5f0 fs/char_dev.c:414 do_dentry_open+0x7cb/0x1020 fs/open.c:826 do_open fs/namei.c:3374 [inline] path_openat+0x27e7/0x36b0 fs/namei.c:3507 do_filp_open+0x253/0x4d0 fs/namei.c:3534 do_sys_openat2+0x124/0x460 fs/open.c:1204 do_sys_open fs/open.c:1220 [inline] __do_sys_openat fs/open.c:1236 [inline] __se_sys_openat fs/open.c:1231 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1231 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+0x44/0xae RIP: 0033:0x4031a7 RSP: 002b:00007ffe35d41750 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000020000440 RCX: 00000000004031a7 RDX: 0000000000000002 RSI: 000000000048803b RDI: 00000000ffffff9c RBP: 000000000048803b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000076 R15: 00007ffe35d43880 INFO: task syz-executor577:8450 blocked for more than 143 seconds. Not tainted 5.14.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor577 state:D stack:24528 pid: 8450 ppid: 8447 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0xc07/0x11f0 kernel/sched/core.c:5938 schedule+0x14b/0x210 kernel/sched/core.c:6017 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6076 __mutex_lock_common+0x116f/0x3770 kernel/locking/mutex.c:1036 __mutex_lock kernel/locking/mutex.c:1104 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1119 misc_open+0x57/0x3c0 drivers/char/misc.c:107 chrdev_open+0x53b/0x5f0 fs/char_dev.c:414 do_dentry_open+0x7cb/0x1020 fs/open.c:826 do_open fs/namei.c:3374 [inline] path_openat+0x27e7/0x36b0 fs/namei.c:3507 do_filp_open+0x253/0x4d0 fs/namei.c:3534 do_sys_openat2+0x124/0x460 fs/open.c:1204 do_sys_open fs/open.c:1220 [inline] __do_sys_openat fs/open.c:1236 [inline] __se_sys_openat fs/open.c:1231 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1231 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+0x44/0xae RIP: 0033:0x4031a7 RSP: 002b:00007ffe35d41750 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000020000440 RCX: 00000000004031a7 RDX: 0000000000000002 RSI: 000000000048803b RDI: 00000000ffffff9c RBP: 000000000048803b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000076 R15: 00007ffe35d43880 INFO: task syz-executor577:8451 blocked for more than 143 seconds. Not tainted 5.14.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor577 state:D stack:24528 pid: 8451 ppid: 8443 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0xc07/0x11f0 kernel/sched/core.c:5938 schedule+0x14b/0x210 kernel/sched/core.c:6017 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6076 __mutex_lock_common+0x116f/0x3770 kernel/locking/mutex.c:1036 __mutex_lock kernel/locking/mutex.c:1104 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1119 misc_open+0x57/0x3c0 drivers/char/misc.c:107 chrdev_open+0x53b/0x5f0 fs/char_dev.c:414 do_dentry_open+0x7cb/0x1020 fs/open.c:826 do_open fs/namei.c:3374 [inline] path_openat+0x27e7/0x36b0 fs/namei.c:3507 do_filp_open+0x253/0x4d0 fs/namei.c:3534 do_sys_openat2+0x124/0x460 fs/open.c:1204 do_sys_open fs/open.c:1220 [inline] __do_sys_openat fs/open.c:1236 [inline] __se_sys_openat fs/open.c:1231 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1231 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+0x44/0xae RIP: 0033:0x4031a7 RSP: 002b:00007ffe35d41750 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000020000440 RCX: 00000000004031a7 RDX: 0000000000000002 RSI: 000000000048803b RDI: 00000000ffffff9c RBP: 000000000048803b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000076 R15: 00007ffe35d43880 INFO: task syz-executor577:8452 blocked for more than 144 seconds. Not tainted 5.14.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor577 state:D stack:25840 pid: 8452 ppid: 8446 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0xc07/0x11f0 kernel/sched/core.c:5938 schedule+0x14b/0x210 kernel/sched/core.c:6017 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6076 __mutex_lock_common+0x116f/0x3770 kernel/locking/mutex.c:1036 __mutex_lock kernel/locking/mutex.c:1104 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1119 misc_open+0x57/0x3c0 drivers/char/misc.c:107 chrdev_open+0x53b/0x5f0 fs/char_dev.c:414 do_dentry_open+0x7cb/0x1020 fs/open.c:826 do_open fs/namei.c:3374 [inline] path_openat+0x27e7/0x36b0 fs/namei.c:3507 do_filp_open+0x253/0x4d0 fs/namei.c:3534 do_sys_openat2+0x124/0x460 fs/open.c:1204 do_sys_open fs/open.c:1220 [inline] __do_sys_openat fs/open.c:1236 [inline] __se_sys_openat fs/open.c:1231 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1231 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+0x44/0xae RIP: 0033:0x4031a7 RSP: 002b:00007ffe35d41750 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000020000440 RCX: 00000000004031a7 RDX: 0000000000000002 RSI: 000000000048803b RDI: 00000000ffffff9c RBP: 000000000048803b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000076 R15: 00007ffe35d43880 INFO: task syz-executor577:8453 blocked for more than 144 seconds. Not tainted 5.14.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor577 state:D stack:25968 pid: 8453 ppid: 8448 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0xc07/0x11f0 kernel/sched/core.c:5938 schedule+0x14b/0x210 kernel/sched/core.c:6017 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6076 __mutex_lock_common+0x116f/0x3770 kernel/locking/mutex.c:1036 __mutex_lock kernel/locking/mutex.c:1104 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1119 misc_open+0x57/0x3c0 drivers/char/misc.c:107 chrdev_open+0x53b/0x5f0 fs/char_dev.c:414 do_dentry_open+0x7cb/0x1020 fs/open.c:826 do_open fs/namei.c:3374 [inline] path_openat+0x27e7/0x36b0 fs/namei.c:3507 do_filp_open+0x253/0x4d0 fs/namei.c:3534 do_sys_openat2+0x124/0x460 fs/open.c:1204 do_sys_open fs/open.c:1220 [inline] __do_sys_openat fs/open.c:1236 [inline] __se_sys_openat fs/open.c:1231 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1231 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+0x44/0xae RIP: 0033:0x4031a7 RSP: 002b:00007ffe35d41750 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000020000440 RCX: 00000000004031a7 RDX: 0000000000000002 RSI: 000000000048803b RDI: 00000000ffffff9c RBP: 000000000048803b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000076 R15: 00007ffe35d43880 Showing all locks held in the system: 5 locks held by kworker/u4:1/10: 1 lock held by khungtaskd/1646: #0: ffffffff8c717ec0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 5 locks held by kworker/1:2/2955: #0: ffff8880197ae138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x7aa/0x10c0 kernel/workqueue.c:2249 #1: ffffc9000985fd20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7e8/0x10c0 kernel/workqueue.c:2251 #2: ffff88802292d220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #2: ffff88802292d220 (&dev->mutex){....}-{3:3}, at: hub_event+0x157/0xd80 drivers/usb/core/hub.c:5662 #3: ffff88802086f220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #3: ffff88802086f220 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x560 drivers/base/dd.c:940 #4: ffff8880213f71a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #4: ffff8880213f71a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x560 drivers/base/dd.c:940 5 locks held by kworker/1:3/4829: #0: ffff8880197ae138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x7aa/0x10c0 kernel/workqueue.c:2249 #1: ffffc90009bcfd20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7e8/0x10c0 kernel/workqueue.c:2251 #2: ffff88802294c220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #2: ffff88802294c220 (&dev->mutex){....}-{3:3}, at: hub_event+0x157/0xd80 drivers/usb/core/hub.c:5662 #3: ffff88801f3af220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #3: ffff88801f3af220 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x560 drivers/base/dd.c:940 #4: ffff88802064f1a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #4: ffff88802064f1a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x560 drivers/base/dd.c:940 1 lock held by in:imklog/8134: #0: ffff88801909a5f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:974 1 lock held by syz-executor577/8449: #0: ffffffff8cdf8c08 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x57/0x3c0 drivers/char/misc.c:107 1 lock held by syz-executor577/8450: #0: ffffffff8cdf8c08 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x57/0x3c0 drivers/char/misc.c:107 1 lock held by syz-executor577/8451: #0: ffffffff8cdf8c08 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x57/0x3c0 drivers/char/misc.c:107 1 lock held by syz-executor577/8452: #0: ffffffff8cdf8c08 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x57/0x3c0 drivers/char/misc.c:107 1 lock held by syz-executor577/8453: #0: ffffffff8cdf8c08 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x57/0x3c0 drivers/char/misc.c:107 5 locks held by kworker/1:0/8455: #0: ffff8880197ae138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x7aa/0x10c0 kernel/workqueue.c:2249 #1: ffffc90000ff7d20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7e8/0x10c0 kernel/workqueue.c:2251 #2: ffff8880229ec220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #2: ffff8880229ec220 (&dev->mutex){....}-{3:3}, at: hub_event+0x157/0xd80 drivers/usb/core/hub.c:5662 #3: ffff88801f3ae220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #3: ffff88801f3ae220 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x560 drivers/base/dd.c:940 #4: ffff88802064e1a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #4: ffff88802064e1a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x560 drivers/base/dd.c:940 5 locks held by kworker/1:1/8463: #0: ffff8880197ae138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x7aa/0x10c0 kernel/workqueue.c:2249 #1: ffffc9000107fd20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7e8/0x10c0 kernel/workqueue.c:2251 #2: ffff888022895220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #2: ffff888022895220 (&dev->mutex){....}-{3:3}, at: hub_event+0x157/0xd80 drivers/usb/core/hub.c:5662 #3: ffff8880213f6220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #3: ffff8880213f6220 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x560 drivers/base/dd.c:940 #4: ffff88802064b1a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #4: ffff88802064b1a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x560 drivers/base/dd.c:940 5 locks held by kworker/1:4/8465: #0: ffff8880197ae138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x7aa/0x10c0 kernel/workqueue.c:2249 #1: ffffc900014dfd20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7e8/0x10c0 kernel/workqueue.c:2251 #2: ffff88814652c220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #2: ffff88814652c220 (&dev->mutex){....}-{3:3}, at: hub_event+0x157/0xd80 drivers/usb/core/hub.c:5662 #3: ffff8880213f0220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #3: ffff8880213f0220 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x560 drivers/base/dd.c:940 #4: ffff88802064a1a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #4: ffff88802064a1a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x560 drivers/base/dd.c:940 2 locks held by syz-executor577/8510: #0: ffffffff8cdf8c08 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x57/0x3c0 drivers/char/misc.c:107 #1: ffffffff8c5d0d68 (system_transition_mutex){+.+.}-{3:3}, at: snapshot_open+0x23/0x260 kernel/power/user.c:54 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1646 Comm: khungtaskd Not tainted 5.14.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1d3/0x29f lib/dump_stack.c:105 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xd06/0xd50 kernel/hung_task.c:295 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4857 Comm: systemd-journal Not tainted 5.14.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:filter_irq_stacks+0x35/0x70 lib/stackdepot.c:359 Code: e0 89 49 c7 c1 d0 0d e0 89 49 c7 c2 00 00 00 8a 49 c7 c3 83 07 00 8a 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 39 c6 74 2b <48> 8b 0c c7 4c 39 c1 40 0f 93 c5 4c 39 c9 0f 92 c3 4c 39 d1 0f 93 RSP: 0018:ffffc90000eb7598 EFLAGS: 00000206 RAX: 0000000000000007 RBX: ffff88802ba0ea01 RCX: ffffffff81d39f01 RDX: 1ffff920001d6e00 RSI: 000000000000000a RDI: ffffc90000eb75b0 RBP: ffffc90000eb7700 R08: ffffffff89e00100 R09: ffffffff89e00dd0 R10: ffffffff8a000000 R11: ffffffff8a000783 R12: ffff88802ba0ebd0 R13: ffff88802ba0ea00 R14: 0000000000000dc0 R15: ffffc90000eb75b0 FS: 00007fb9162008c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb9135f0000 CR3: 0000000018c6d000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kasan_save_stack mm/kasan/common.c:39 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0xad/0xd0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:2959 [inline] slab_alloc mm/slub.c:2967 [inline] kmem_cache_alloc+0x1d1/0x340 mm/slub.c:2972 kmem_cache_zalloc include/linux/slab.h:711 [inline] __alloc_file+0x26/0x2f0 fs/file_table.c:101 alloc_empty_file+0xa9/0x1b0 fs/file_table.c:150 path_openat+0x114/0x36b0 fs/namei.c:3493 do_filp_open+0x253/0x4d0 fs/namei.c:3534 do_sys_openat2+0x124/0x460 fs/open.c:1204 do_sys_open fs/open.c:1220 [inline] __do_sys_open fs/open.c:1228 [inline] __se_sys_open fs/open.c:1224 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1224 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+0x44/0xae RIP: 0033:0x7fb91578f840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007fff3506f4a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fff3506f7b0 RCX: 00007fb91578f840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055f44a871fc0 RBP: 000000000000000d R08: 0000000000000000 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055f44a866040 R14: 00007fff3506f770 R15: 000055f44a8737a0 ---------------- Code disassembly (best guess): 0: e0 89 loopne 0xffffff8b 2: 49 c7 c1 d0 0d e0 89 mov $0xffffffff89e00dd0,%r9 9: 49 c7 c2 00 00 00 8a mov $0xffffffff8a000000,%r10 10: 49 c7 c3 83 07 00 8a mov $0xffffffff8a000783,%r11 17: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) 1e: 00 00 00 00 22: 0f 1f 00 nopl (%rax) 25: 48 39 c6 cmp %rax,%rsi 28: 74 2b je 0x55 * 2a: 48 8b 0c c7 mov (%rdi,%rax,8),%rcx <-- trapping instruction 2e: 4c 39 c1 cmp %r8,%rcx 31: 40 0f 93 c5 setae %bpl 35: 4c 39 c9 cmp %r9,%rcx 38: 0f 92 c3 setb %bl 3b: 4c 39 d1 cmp %r10,%rcx 3e: 0f .byte 0xf 3f: 93 xchg %eax,%ebx