================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor/4194 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff88807cbd4710 ((work_completion)(&(&host->detect)->work)){+.?.}-{0:0}, at: __flush_work+0xfa/0x210 kernel/workqueue.c:3090 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 process_one_work+0x7ba/0xff0 kernel/workqueue.c:2286 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457 kthread+0x42e/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 irq event stamp: 162564 hardirqs last enabled at (162564): [] __cancel_work_timer+0x36a/0x560 kernel/workqueue.c:3174 hardirqs last disabled at (162563): [] try_to_grab_pending+0xfb/0x820 kernel/workqueue.c:1272 softirqs last enabled at (162338): [] local_bh_enable+0x5/0x20 include/linux/bottom_half.h:31 softirqs last disabled at (162475): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (162475): [] invoke_softirq kernel/softirq.c:450 [inline] softirqs last disabled at (162475): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock((work_completion)(&(&host->detect)->work)); lock((work_completion)(&(&host->detect)->work)); *** DEADLOCK *** 4 locks held by syz-executor/4194: #0: ffffffff8c3a8fd0 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mmap kernel/fork.c:504 [inline] #0: ffffffff8c3a8fd0 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1472 [inline] #0: ffffffff8c3a8fd0 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm+0x229/0x13d0 kernel/fork.c:1524 #1: ffff88807b39ea28 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] #1: ffff88807b39ea28 (&mm->mmap_lock){++++}-{3:3}, at: dup_mmap kernel/fork.c:505 [inline] #1: ffff88807b39ea28 (&mm->mmap_lock){++++}-{3:3}, at: dup_mm kernel/fork.c:1472 [inline] #1: ffff88807b39ea28 (&mm->mmap_lock){++++}-{3:3}, at: copy_mm+0x247/0x13d0 kernel/fork.c:1524 #2: ffff888078a3a428 (&mm->mmap_lock/1){+.+.}-{3:3}, at: mmap_write_lock_nested include/linux/mmap_lock.h:78 [inline] #2: ffff888078a3a428 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mmap kernel/fork.c:514 [inline] #2: ffff888078a3a428 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mm kernel/fork.c:1472 [inline] #2: ffff888078a3a428 (&mm->mmap_lock/1){+.+.}-{3:3}, at: copy_mm+0x343/0x13d0 kernel/fork.c:1524 #3: ffffc90000007bc0 ((&vub300->inactivity_timer)){+.-.}-{0:0}, at: lockdep_copy_map include/linux/lockdep.h:45 [inline] #3: ffffc90000007bc0 ((&vub300->inactivity_timer)){+.-.}-{0:0}, at: call_timer_fn+0xca/0x540 kernel/time/timer.c:1638 stack backtrace: CPU: 0 PID: 4194 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 valid_state+0x13b/0x1d0 kernel/locking/lockdep.c:3932 mark_lock_irq+0xa9/0x900 kernel/locking/lockdep.c:4135 mark_lock+0x208/0x320 kernel/locking/lockdep.c:4591 mark_usage kernel/locking/lockdep.c:-1 [inline] __lock_acquire+0xc63/0x7b50 kernel/locking/lockdep.c:4966 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __flush_work+0x116/0x210 kernel/workqueue.c:3090 __cancel_work_timer+0x3f4/0x560 kernel/workqueue.c:3181 mmc_free_host+0x15/0x30 drivers/mmc/core/host.c:663 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648 expire_timers kernel/time/timer.c:1699 [inline] __run_timers+0x56c/0x810 kernel/time/timer.c:1970 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983 handle_softirqs+0x336/0x830 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:unwind_next_frame+0x85f/0x1cf0 arch/x86/kernel/unwind_orc.c:535 Code: 12 00 00 4c 89 f8 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 dd 12 00 00 49 0f bf 04 24 48 01 c2 4d 89 f7 48 89 14 24 4c 89 64 24 20 <4d> 8d 77 01 41 0f b6 44 2d 00 84 c0 0f 85 bf 0e 00 00 4d 89 f4 49 RSP: 0018:ffffc90002f5f0f0 EFLAGS: 00000296 RAX: 0000000000000018 RBX: ffffc90002f5f188 RCX: ffffffff8d9fa908 RDX: ffffc90002f5f5c0 RSI: ffffffff8d9fa8e0 RDI: ffffffff81350ed7 RBP: dffffc0000000000 R08: 0000000000000011 R09: 0000000000000003 R10: dffffc0000000000 R11: fffff520005ebe3d R12: ffffffff8e0e74b4 R13: 1ffffffff1c1ce97 R14: ffffc90002f5f1c0 R15: ffffffff8e0e74b8 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x92/0xc0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x15d/0x280 mm/slub.c:3238 ptlock_alloc+0x1c/0x60 mm/memory.c:5556 ptlock_init include/linux/mm.h:2241 [inline] pgtable_pte_page_ctor include/linux/mm.h:2268 [inline] __pte_alloc_one include/asm-generic/pgalloc.h:66 [inline] pte_alloc_one+0xc0/0x310 arch/x86/mm/pgtable.c:33 __pte_alloc+0x21/0x150 mm/memory.c:439 copy_pte_range mm/memory.c:1032 [inline] copy_pmd_range mm/memory.c:1167 [inline] copy_pud_range mm/memory.c:1204 [inline] copy_p4d_range mm/memory.c:1228 [inline] copy_page_range+0x2ab2/0x32c0 mm/memory.c:1301 dup_mmap kernel/fork.c:616 [inline] dup_mm kernel/fork.c:1472 [inline] copy_mm+0xc61/0x13d0 kernel/fork.c:1524 copy_process+0x17a7/0x3e70 kernel/fork.c:2292 kernel_clone+0x23f/0x990 kernel/fork.c:2682 __do_sys_clone kernel/fork.c:2799 [inline] __se_sys_clone kernel/fork.c:2783 [inline] __x64_sys_clone+0x19a/0x210 kernel/fork.c:2783 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f922422bb52 Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffd1ba3dcd0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffd1ba3dcd0 RCX: 00007f922422bb52 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffd1ba3de5c R08: 0000000000000000 R09: 0000000000000001 R10: 000055555fb997d0 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000000927c0 R14: 00000000000137a2 R15: 00007ffd1ba3deb0 vkms_vblank_simulate: vblank timer overrun BUG: sleeping function called from invalid context at kernel/workqueue.c:3031 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 4194, name: syz-executor INFO: lockdep is turned off. Preemption disabled at: [] unwind_next_frame+0x97/0x1cf0 arch/x86/kernel/unwind_orc.c:433 CPU: 0 PID: 4194 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 ___might_sleep+0x493/0x610 kernel/sched/core.c:9658 start_flush_work+0x2e/0x830 kernel/workqueue.c:3031 __flush_work+0x148/0x210 kernel/workqueue.c:3093 __cancel_work_timer+0x3f4/0x560 kernel/workqueue.c:3181 mmc_free_host+0x15/0x30 drivers/mmc/core/host.c:663 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648 expire_timers kernel/time/timer.c:1699 [inline] __run_timers+0x56c/0x810 kernel/time/timer.c:1970 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983 handle_softirqs+0x336/0x830 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:unwind_next_frame+0x85f/0x1cf0 arch/x86/kernel/unwind_orc.c:535 Code: 12 00 00 4c 89 f8 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 dd 12 00 00 49 0f bf 04 24 48 01 c2 4d 89 f7 48 89 14 24 4c 89 64 24 20 <4d> 8d 77 01 41 0f b6 44 2d 00 84 c0 0f 85 bf 0e 00 00 4d 89 f4 49 RSP: 0018:ffffc90002f5f0f0 EFLAGS: 00000296 RAX: 0000000000000018 RBX: ffffc90002f5f188 RCX: ffffffff8d9fa908 RDX: ffffc90002f5f5c0 RSI: ffffffff8d9fa8e0 RDI: ffffffff81350ed7 RBP: dffffc0000000000 R08: 0000000000000011 R09: 0000000000000003 R10: dffffc0000000000 R11: fffff520005ebe3d R12: ffffffff8e0e74b4 R13: 1ffffffff1c1ce97 R14: ffffc90002f5f1c0 R15: ffffffff8e0e74b8 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x92/0xc0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x15d/0x280 mm/slub.c:3238 ptlock_alloc+0x1c/0x60 mm/memory.c:5556 ptlock_init include/linux/mm.h:2241 [inline] pgtable_pte_page_ctor include/linux/mm.h:2268 [inline] __pte_alloc_one include/asm-generic/pgalloc.h:66 [inline] pte_alloc_one+0xc0/0x310 arch/x86/mm/pgtable.c:33 __pte_alloc+0x21/0x150 mm/memory.c:439 copy_pte_range mm/memory.c:1032 [inline] copy_pmd_range mm/memory.c:1167 [inline] copy_pud_range mm/memory.c:1204 [inline] copy_p4d_range mm/memory.c:1228 [inline] copy_page_range+0x2ab2/0x32c0 mm/memory.c:1301 dup_mmap kernel/fork.c:616 [inline] dup_mm kernel/fork.c:1472 [inline] copy_mm+0xc61/0x13d0 kernel/fork.c:1524 copy_process+0x17a7/0x3e70 kernel/fork.c:2292 kernel_clone+0x23f/0x990 kernel/fork.c:2682 __do_sys_clone kernel/fork.c:2799 [inline] __se_sys_clone kernel/fork.c:2783 [inline] __x64_sys_clone+0x19a/0x210 kernel/fork.c:2783 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f922422bb52 Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffd1ba3dcd0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffd1ba3dcd0 RCX: 00007f922422bb52 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffd1ba3de5c R08: 0000000000000000 R09: 0000000000000001 R10: 000055555fb997d0 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000000927c0 R14: 00000000000137a2 R15: 00007ffd1ba3deb0 vkms_vblank_simulate: vblank timer overrun ODEBUG: object ffffc900000079a0 is NOT on stack ffffc90002f58000, but annotated. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 4194 at lib/debugobjects.c:561 debug_object_is_on_stack lib/debugobjects.c:-1 [inline] WARNING: CPU: 0 PID: 4194 at lib/debugobjects.c:561 lookup_object_or_alloc lib/debugobjects.c:594 [inline] WARNING: CPU: 0 PID: 4194 at lib/debugobjects.c:561 __debug_object_init+0x4c0/0xc80 lib/debugobjects.c:621 Modules linked in: CPU: 0 PID: 4194 Comm: syz-executor Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:debug_object_is_on_stack lib/debugobjects.c:561 [inline] RIP: 0010:lookup_object_or_alloc lib/debugobjects.c:594 [inline] RIP: 0010:__debug_object_init+0x4c0/0xc80 lib/debugobjects.c:621 Code: a6 23 73 12 48 c7 c1 c0 4a 7a 8a 48 c7 c7 20 4b 7a 8a 84 c0 48 0f 45 f9 4c 89 ee e8 ba cd c8 05 48 be 00 00 00 00 00 fc ff df <0f> 0b e9 4d fd ff ff 83 3d d2 22 73 12 00 4c 89 6c 24 28 0f 84 23 RSP: 0018:ffffc900000077e0 EFLAGS: 00010046 RAX: 0000000000000050 RBX: 0000000000000001 RCX: fb32d95ac7148c00 RDX: 0000000000000100 RSI: dffffc0000000000 RDI: 0000000000000000 RBP: ffffc90000007950 R08: ffffc90000007307 R09: 1ffff92000000e60 R10: dffffc0000000000 R11: fffff52000000e61 R12: f8f8f8f8f8f8f8f8 R13: ffffc900000079a0 R14: ffff888079879de0 R15: ffff88801f4eb0e0 FS: 000055555fb99500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9224fba6c8 CR3: 0000000063450000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __synchronize_srcu+0x229/0x350 kernel/rcu/srcutree.c:928 wakeup_source_remove drivers/base/power/wakeup.c:203 [inline] wakeup_source_unregister+0x112/0x190 drivers/base/power/wakeup.c:247 mmc_host_classdev_release+0x43/0xf0 drivers/mmc/core/host.c:77 device_release+0x92/0x1c0 drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:713 [inline] kobject_release lib/kobject.c:744 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x217/0x450 lib/kobject.c:761 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648 expire_timers kernel/time/timer.c:1699 [inline] __run_timers+0x56c/0x810 kernel/time/timer.c:1970 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983 handle_softirqs+0x336/0x830 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:unwind_next_frame+0x85f/0x1cf0 arch/x86/kernel/unwind_orc.c:535 Code: 12 00 00 4c 89 f8 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 dd 12 00 00 49 0f bf 04 24 48 01 c2 4d 89 f7 48 89 14 24 4c 89 64 24 20 <4d> 8d 77 01 41 0f b6 44 2d 00 84 c0 0f 85 bf 0e 00 00 4d 89 f4 49 RSP: 0018:ffffc90002f5f0f0 EFLAGS: 00000296 RAX: 0000000000000018 RBX: ffffc90002f5f188 RCX: ffffffff8d9fa908 RDX: ffffc90002f5f5c0 RSI: ffffffff8d9fa8e0 RDI: ffffffff81350ed7 RBP: dffffc0000000000 R08: 0000000000000011 R09: 0000000000000003 R10: dffffc0000000000 R11: fffff520005ebe3d R12: ffffffff8e0e74b4 R13: 1ffffffff1c1ce97 R14: ffffc90002f5f1c0 R15: ffffffff8e0e74b8 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x92/0xc0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x15d/0x280 mm/slub.c:3238 ptlock_alloc+0x1c/0x60 mm/memory.c:5556 ptlock_init include/linux/mm.h:2241 [inline] pgtable_pte_page_ctor include/linux/mm.h:2268 [inline] __pte_alloc_one include/asm-generic/pgalloc.h:66 [inline] pte_alloc_one+0xc0/0x310 arch/x86/mm/pgtable.c:33 __pte_alloc+0x21/0x150 mm/memory.c:439 copy_pte_range mm/memory.c:1032 [inline] copy_pmd_range mm/memory.c:1167 [inline] copy_pud_range mm/memory.c:1204 [inline] copy_p4d_range mm/memory.c:1228 [inline] copy_page_range+0x2ab2/0x32c0 mm/memory.c:1301 dup_mmap kernel/fork.c:616 [inline] dup_mm kernel/fork.c:1472 [inline] copy_mm+0xc61/0x13d0 kernel/fork.c:1524 copy_process+0x17a7/0x3e70 kernel/fork.c:2292 kernel_clone+0x23f/0x990 kernel/fork.c:2682 __do_sys_clone kernel/fork.c:2799 [inline] __se_sys_clone kernel/fork.c:2783 [inline] __x64_sys_clone+0x19a/0x210 kernel/fork.c:2783 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f922422bb52 Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffd1ba3dcd0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffd1ba3dcd0 RCX: 00007f922422bb52 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffd1ba3de5c R08: 0000000000000000 R09: 0000000000000001 R10: 000055555fb997d0 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000000927c0 R14: 00000000000137a2 R15: 00007ffd1ba3deb0 ---------------- Code disassembly (best guess): 0: 12 00 adc (%rax),%al 2: 00 4c 89 f8 add %cl,-0x8(%rcx,%rcx,4) 6: 48 c1 e8 03 shr $0x3,%rax a: 0f b6 04 28 movzbl (%rax,%rbp,1),%eax e: 84 c0 test %al,%al 10: 0f 85 dd 12 00 00 jne 0x12f3 16: 49 0f bf 04 24 movswq (%r12),%rax 1b: 48 01 c2 add %rax,%rdx 1e: 4d 89 f7 mov %r14,%r15 21: 48 89 14 24 mov %rdx,(%rsp) 25: 4c 89 64 24 20 mov %r12,0x20(%rsp) * 2a: 4d 8d 77 01 lea 0x1(%r15),%r14 <-- trapping instruction 2e: 41 0f b6 44 2d 00 movzbl 0x0(%r13,%rbp,1),%eax 34: 84 c0 test %al,%al 36: 0f 85 bf 0e 00 00 jne 0xefb 3c: 4d 89 f4 mov %r14,%r12 3f: 49 rex.WB