vkms_vblank_simulate: vblank timer overrun ======================================================== WARNING: possible irq lock inversion dependency detected 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted -------------------------------------------------------- syz-executor.1/5077 just changed the state of lock: ffff888029596110 (&group->lock#2){..-.}-{2:2}, at: _snd_pcm_stream_lock_irqsave+0xa0/0xd0 sound/core/pcm_native.c:170 but this lock took another, SOFTIRQ-unsafe lock in the past: (&timer->lock){+.+.}-{2:2} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&timer->lock); local_irq_disable(); lock(&group->lock#2); lock(&timer->lock); lock(&group->lock#2); *** DEADLOCK *** 8 locks held by syz-executor.1/5077: #0: ffffffff8d8b9030 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mmap kernel/fork.c:637 [inline] #0: ffffffff8d8b9030 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1687 [inline] #0: ffffffff8d8b9030 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm kernel/fork.c:1736 [inline] #0: ffffffff8d8b9030 (dup_mmap_sem){.+.+}-{0:0}, at: copy_process+0x67cb/0x9160 kernel/fork.c:2389 #1: ffff888079db60a0 (&mm->mmap_lock){++++}-{3:3} , at: mmap_write_lock_killable include/linux/mmap_lock.h:124 [inline] , at: dup_mmap kernel/fork.c:638 [inline] , at: dup_mm kernel/fork.c:1687 [inline] , at: copy_mm kernel/fork.c:1736 [inline] , at: copy_process+0x67f1/0x9160 kernel/fork.c:2389 #2: ffff88802322d720 (&mm->mmap_lock/1){+.+.}-{3:3}, at: mmap_write_lock_nested include/linux/mmap_lock.h:115 [inline] #2: ffff88802322d720 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mmap kernel/fork.c:647 [inline] #2: ffff88802322d720 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mm kernel/fork.c:1687 [inline] #2: ffff88802322d720 (&mm->mmap_lock/1){+.+.}-{3:3}, at: copy_mm kernel/fork.c:1736 [inline] #2: ffff88802322d720 (&mm->mmap_lock/1){+.+.}-{3:3}, at: copy_process+0x6851/0x9160 kernel/fork.c:2389 #3: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #3: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #3: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: __pte_offset_map+0x42/0x540 mm/pgtable-generic.c:285 #4: ffff888076e226d8 (ptlock_ptr(ptdesc)#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #4: ffff888076e226d8 (ptlock_ptr(ptdesc)#2){+.+.}-{2:2}, at: __pte_offset_map_lock+0xf1/0x300 mm/pgtable-generic.c:373 #5: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #5: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #5: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: __pte_offset_map+0x42/0x540 mm/pgtable-generic.c:285 #6: ffff888062a05618 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_pte_range mm/memory.c:1059 [inline] #6: ffff888062a05618 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_pmd_range mm/memory.c:1187 [inline] #6: ffff888062a05618 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_pud_range mm/memory.c:1224 [inline] #6: ffff888062a05618 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_p4d_range mm/memory.c:1248 [inline] #6: ffff888062a05618 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_page_range+0xd1c/0x3d10 mm/memory.c:1346 #7: ffffffff8d7b0820 (rcu_read_lock_sched){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #7: ffffffff8d7b0820 (rcu_read_lock_sched){....}-{1:2}, at: rcu_read_lock_sched include/linux/rcupdate.h:842 [inline] #7: ffffffff8d7b0820 (rcu_read_lock_sched){....}-{1:2}, at: pfn_valid include/linux/mmzone.h:2016 [inline] #7: ffffffff8d7b0820 (rcu_read_lock_sched){....}-{1:2}, at: page_table_check_set+0x113/0xc60 mm/page_table_check.c:105 the shortest dependencies between 2nd lock and 1st lock: -> (&timer->lock){+.+.}-{2:2} { HARDIRQ-ON-W at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] class_spinlock_constructor include/linux/spinlock.h:561 [inline] snd_timer_close_locked+0x65/0xbd0 sound/core/timer.c:412 snd_timer_close+0x8b/0xf0 sound/core/timer.c:464 snd_timer_user_tselect sound/core/timer.c:1694 [inline] __snd_timer_user_ioctl.isra.0+0x11a2/0x2620 sound/core/timer.c:2027 snd_timer_user_ioctl+0x7b/0xc0 sound/core/timer.c:2058 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl fs/ioctl.c:890 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:890 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 SOFTIRQ-ON-W at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] class_spinlock_constructor include/linux/spinlock.h:561 [inline] snd_timer_close_locked+0x65/0xbd0 sound/core/timer.c:412 snd_timer_close+0x8b/0xf0 sound/core/timer.c:464 snd_timer_user_tselect sound/core/timer.c:1694 [inline] __snd_timer_user_ioctl.isra.0+0x11a2/0x2620 sound/core/timer.c:2027 snd_timer_user_ioctl+0x7b/0xc0 sound/core/timer.c:2058 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl fs/ioctl.c:890 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:890 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 class_spinlock_irqsave_constructor include/linux/spinlock.h:574 [inline] snd_timer_stop1+0x60/0x890 sound/core/timer.c:602 snd_timer_stop sound/core/timer.c:679 [inline] snd_timer_user_params.isra.0+0x328/0x920 sound/core/timer.c:1811 __snd_timer_user_ioctl.isra.0+0x1096/0x2620 sound/core/timer.c:2031 snd_timer_user_ioctl+0x7b/0xc0 sound/core/timer.c:2058 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl fs/ioctl.c:890 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:890 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 } ... key at: [] __key.6+0x0/0x40 ... acquired at: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 class_spinlock_irqsave_constructor include/linux/spinlock.h:574 [inline] snd_timer_notify+0x111/0x3e0 sound/core/timer.c:1040 snd_pcm_timer_notify sound/core/pcm_native.c:622 [inline] snd_pcm_post_start+0x272/0x350 sound/core/pcm_native.c:1459 snd_pcm_action_single+0x10a/0x150 sound/core/pcm_native.c:1289 snd_pcm_action+0x70/0x90 sound/core/pcm_native.c:1370 __snd_pcm_lib_xfer+0x13f5/0x1ea0 sound/core/pcm_lib.c:2371 snd_pcm_oss_write3+0xd5/0x1e0 sound/core/oss/pcm_oss.c:1242 snd_pcm_oss_write2+0x31b/0x3f0 sound/core/oss/pcm_oss.c:1382 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1440 [inline] snd_pcm_oss_write+0x733/0xa10 sound/core/oss/pcm_oss.c:2796 vfs_write+0x298/0x1100 fs/read_write.c:588 ksys_write+0x12f/0x260 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 -> (&group->lock#2){..-.}-{2:2} { IN-SOFTIRQ-W at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 _snd_pcm_stream_lock_irqsave+0xa0/0xd0 sound/core/pcm_native.c:170 class_pcm_stream_lock_irqsave_constructor include/sound/pcm.h:669 [inline] snd_pcm_period_elapsed+0x20/0x50 sound/core/pcm_lib.c:1904 dummy_hrtimer_callback+0x9d/0x1c0 sound/drivers/dummy.c:385 __run_hrtimer kernel/time/hrtimer.c:1692 [inline] __hrtimer_run_queues+0x20c/0xc20 kernel/time/hrtimer.c:1756 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1773 __do_softirq+0x218/0x8de kernel/softirq.c:554 invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:633 [inline] irq_exit_rcu+0xb9/0x120 kernel/softirq.c:645 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 lock_acquire+0x1f2/0x540 kernel/locking/lockdep.c:5722 rcu_lock_acquire include/linux/rcupdate.h:298 [inline] rcu_read_lock_sched include/linux/rcupdate.h:842 [inline] pfn_valid include/linux/mmzone.h:2016 [inline] page_table_check_set+0x119/0xc60 mm/page_table_check.c:105 __page_table_check_ptes_set+0x444/0x700 mm/page_table_check.c:196 page_table_check_ptes_set include/linux/page_table_check.h:74 [inline] set_ptes include/linux/pgtable.h:241 [inline] copy_present_pte mm/memory.c:993 [inline] copy_pte_range mm/memory.c:1102 [inline] copy_pmd_range mm/memory.c:1187 [inline] copy_pud_range mm/memory.c:1224 [inline] copy_p4d_range mm/memory.c:1248 [inline] copy_page_range+0x152e/0x3d10 mm/memory.c:1346 dup_mmap kernel/fork.c:747 [inline] dup_mm kernel/fork.c:1687 [inline] copy_mm kernel/fork.c:1736 [inline] copy_process+0x81bf/0x9160 kernel/fork.c:2389 kernel_clone+0xfd/0x940 kernel/fork.c:2796 __do_sys_clone+0xba/0x100 kernel/fork.c:2939 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:170 spin_lock_irq include/linux/spinlock.h:376 [inline] snd_pcm_group_lock_irq sound/core/pcm_native.c:97 [inline] snd_pcm_stream_lock_irq sound/core/pcm_native.c:136 [inline] class_pcm_stream_lock_irq_constructor include/sound/pcm.h:666 [inline] snd_pcm_hw_params+0x151/0x1a30 sound/core/pcm_native.c:740 snd_pcm_kernel_ioctl+0x147/0x2d0 sound/core/pcm_native.c:3434 snd_pcm_oss_change_params_locked+0x146c/0x3aa0 sound/core/oss/pcm_oss.c:965 snd_pcm_oss_make_ready_locked+0xb7/0x130 sound/core/oss/pcm_oss.c:1187 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1405 [inline] snd_pcm_oss_write+0x4af/0xa10 sound/core/oss/pcm_oss.c:2796 vfs_write+0x298/0x1100 fs/read_write.c:588 ksys_write+0x12f/0x260 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 } ... key at: [] __key.5+0x0/0x40 ... acquired at: mark_usage kernel/locking/lockdep.c:4567 [inline] __lock_acquire+0x13d4/0x3b30 kernel/locking/lockdep.c:5091 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 _snd_pcm_stream_lock_irqsave+0xa0/0xd0 sound/core/pcm_native.c:170 class_pcm_stream_lock_irqsave_constructor include/sound/pcm.h:669 [inline] snd_pcm_period_elapsed+0x20/0x50 sound/core/pcm_lib.c:1904 dummy_hrtimer_callback+0x9d/0x1c0 sound/drivers/dummy.c:385 __run_hrtimer kernel/time/hrtimer.c:1692 [inline] __hrtimer_run_queues+0x20c/0xc20 kernel/time/hrtimer.c:1756 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1773 __do_softirq+0x218/0x8de kernel/softirq.c:554 invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:633 [inline] irq_exit_rcu+0xb9/0x120 kernel/softirq.c:645 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 lock_acquire+0x1f2/0x540 kernel/locking/lockdep.c:5722 rcu_lock_acquire include/linux/rcupdate.h:298 [inline] rcu_read_lock_sched include/linux/rcupdate.h:842 [inline] pfn_valid include/linux/mmzone.h:2016 [inline] page_table_check_set+0x119/0xc60 mm/page_table_check.c:105 __page_table_check_ptes_set+0x444/0x700 mm/page_table_check.c:196 page_table_check_ptes_set include/linux/page_table_check.h:74 [inline] set_ptes include/linux/pgtable.h:241 [inline] copy_present_pte mm/memory.c:993 [inline] copy_pte_range mm/memory.c:1102 [inline] copy_pmd_range mm/memory.c:1187 [inline] copy_pud_range mm/memory.c:1224 [inline] copy_p4d_range mm/memory.c:1248 [inline] copy_page_range+0x152e/0x3d10 mm/memory.c:1346 dup_mmap kernel/fork.c:747 [inline] dup_mm kernel/fork.c:1687 [inline] copy_mm kernel/fork.c:1736 [inline] copy_process+0x81bf/0x9160 kernel/fork.c:2389 kernel_clone+0xfd/0x940 kernel/fork.c:2796 __do_sys_clone+0xba/0x100 kernel/fork.c:2939 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 stack backtrace: CPU: 0 PID: 5077 Comm: syz-executor.1 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_irq_inversion_bug.part.0+0x3e9/0x5a0 kernel/locking/lockdep.c:4080 print_irq_inversion_bug kernel/locking/lockdep.c:4033 [inline] check_usage_forwards kernel/locking/lockdep.c:4111 [inline] mark_lock_irq kernel/locking/lockdep.c:4243 [inline] mark_lock+0x574/0xc60 kernel/locking/lockdep.c:4678 mark_usage kernel/locking/lockdep.c:4567 [inline] __lock_acquire+0x13d4/0x3b30 kernel/locking/lockdep.c:5091 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 _snd_pcm_stream_lock_irqsave+0xa0/0xd0 sound/core/pcm_native.c:170 class_pcm_stream_lock_irqsave_constructor include/sound/pcm.h:669 [inline] snd_pcm_period_elapsed+0x20/0x50 sound/core/pcm_lib.c:1904 dummy_hrtimer_callback+0x9d/0x1c0 sound/drivers/dummy.c:385 __run_hrtimer kernel/time/hrtimer.c:1692 [inline] __hrtimer_run_queues+0x20c/0xc20 kernel/time/hrtimer.c:1756 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1773 __do_softirq+0x218/0x8de kernel/softirq.c:554 invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:633 [inline] irq_exit_rcu+0xb9/0x120 kernel/softirq.c:645 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x1f2/0x540 kernel/locking/lockdep.c:5722 Code: c1 05 ea 37 97 7e 83 f8 01 0f 85 c8 02 00 00 9c 58 f6 c4 02 0f 85 b3 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc9000354f5f0 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff920006a9ec0 RCX: 000000002ac08111 RDX: 0000000000000001 RSI: ffffffff8b0cba40 RDI: ffffffff8b6e88a0 RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff27b4e30 R10: ffffffff93da7187 R11: 0000000000000007 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff8d7b0820 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:298 [inline] rcu_read_lock_sched include/linux/rcupdate.h:842 [inline] pfn_valid include/linux/mmzone.h:2016 [inline] page_table_check_set+0x119/0xc60 mm/page_table_check.c:105 __page_table_check_ptes_set+0x444/0x700 mm/page_table_check.c:196 page_table_check_ptes_set include/linux/page_table_check.h:74 [inline] set_ptes include/linux/pgtable.h:241 [inline] copy_present_pte mm/memory.c:993 [inline] copy_pte_range mm/memory.c:1102 [inline] copy_pmd_range mm/memory.c:1187 [inline] copy_pud_range mm/memory.c:1224 [inline] copy_p4d_range mm/memory.c:1248 [inline] copy_page_range+0x152e/0x3d10 mm/memory.c:1346 dup_mmap kernel/fork.c:747 [inline] dup_mm kernel/fork.c:1687 [inline] copy_mm kernel/fork.c:1736 [inline] copy_process+0x81bf/0x9160 kernel/fork.c:2389 kernel_clone+0xfd/0x940 kernel/fork.c:2796 __do_sys_clone+0xba/0x100 kernel/fork.c:2939 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7fd91a67ae93 Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 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 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffff0f5c8f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd91a67ae93 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000555558032750 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001 vkms_vblank_simulate: vblank timer overrun vkms_vblank_simulate: vblank timer overrun vkms_vblank_simulate: vblank timer overrun vkms_vblank_simulate: vblank timer overrun ---------------- Code disassembly (best guess): 0: c1 05 ea 37 97 7e 83 roll $0x83,0x7e9737ea(%rip) # 0x7e9737f1 7: f8 clc 8: 01 0f add %ecx,(%rdi) a: 85 c8 test %ecx,%eax c: 02 00 add (%rax),%al e: 00 9c 58 f6 c4 02 0f add %bl,0xf02c4f6(%rax,%rbx,2) 15: 85 b3 02 00 00 48 test %esi,0x48000002(%rbx) 1b: 85 ed test %ebp,%ebp 1d: 74 01 je 0x20 1f: fb sti 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 27: fc ff df * 2a: 48 01 c3 add %rax,%rbx <-- trapping instruction 2d: 48 c7 03 00 00 00 00 movq $0x0,(%rbx) 34: 48 c7 43 08 00 00 00 movq $0x0,0x8(%rbx) 3b: 00 3c: 48 rex.W 3d: 8b .byte 0x8b 3e: 84 .byte 0x84 3f: 24 .byte 0x24