======================================================== WARNING: possible irq lock inversion dependency detected 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted -------------------------------------------------------- syz-executor.0/7299 just changed the state of lock: ffff8880299cc110 (&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 *** 2 locks held by syz-executor.0/7299: #0: ffff88802f3aa420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x2409/0x2760 kernel/signal.c:2893 #1: ffff88807d1aea20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable include/linux/mmap_lock.h:155 [inline] #1: ffff88807d1aea20 (&mm->mmap_lock){++++}-{3:3}, at: __get_user_pages_locked mm/gup.c:1484 [inline] #1: ffff88807d1aea20 (&mm->mmap_lock){++++}-{3:3}, at: get_dump_page+0xb6/0x220 mm/gup.c:2031 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_seq_timer_close+0xa4/0x100 sound/core/seq/seq_timer.c:302 queue_delete+0x49/0xa0 sound/core/seq/seq_queue.c:126 snd_seq_queue_client_leave+0x37/0x1a0 sound/core/seq/seq_queue.c:543 seq_free_client1.part.0+0x10a/0x260 sound/core/seq/seq_clientmgr.c:285 seq_free_client1 sound/core/seq/seq_clientmgr.c:278 [inline] seq_free_client+0x74/0x170 sound/core/seq/seq_clientmgr.c:306 snd_seq_release+0x50/0xe0 sound/core/seq/seq_clientmgr.c:387 __fput+0x270/0xb80 fs/file_table.c:422 __fput_sync+0x47/0x50 fs/file_table.c:507 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __x64_sys_close+0x86/0x100 fs/open.c:1541 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_seq_timer_close+0xa4/0x100 sound/core/seq/seq_timer.c:302 queue_delete+0x49/0xa0 sound/core/seq/seq_queue.c:126 snd_seq_queue_client_leave+0x37/0x1a0 sound/core/seq/seq_queue.c:543 seq_free_client1.part.0+0x10a/0x260 sound/core/seq/seq_clientmgr.c:285 seq_free_client1 sound/core/seq/seq_clientmgr.c:278 [inline] seq_free_client+0x74/0x170 sound/core/seq/seq_clientmgr.c:306 snd_seq_release+0x50/0xe0 sound/core/seq/seq_clientmgr.c:387 __fput+0x270/0xb80 fs/file_table.c:422 __fput_sync+0x47/0x50 fs/file_table.c:507 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __x64_sys_close+0x86/0x100 fs/open.c:1541 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_notify+0x111/0x3e0 sound/core/timer.c:1040 snd_pcm_timer_notify sound/core/pcm_native.c:622 [inline] snd_pcm_post_stop+0x197/0x1f0 sound/core/pcm_native.c:1520 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_stop sound/core/pcm_native.c:1543 [inline] snd_pcm_drop+0x165/0x2b0 sound/core/pcm_native.c:2208 snd_pcm_kernel_ioctl+0x22d/0x2d0 sound/core/pcm_native.c:3444 snd_pcm_oss_sync+0x227/0x7f0 sound/core/oss/pcm_oss.c:1734 snd_pcm_oss_release+0x291/0x320 sound/core/oss/pcm_oss.c:2575 __fput+0x270/0xb80 fs/file_table.c:422 __fput_sync+0x47/0x50 fs/file_table.c:507 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __x64_sys_close+0x86/0x100 fs/open.c:1541 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_stop+0x197/0x1f0 sound/core/pcm_native.c:1520 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_stop sound/core/pcm_native.c:1543 [inline] snd_pcm_drop+0x165/0x2b0 sound/core/pcm_native.c:2208 snd_pcm_kernel_ioctl+0x22d/0x2d0 sound/core/pcm_native.c:3444 snd_pcm_oss_sync+0x227/0x7f0 sound/core/oss/pcm_oss.c:1734 snd_pcm_oss_release+0x291/0x320 sound/core/oss/pcm_oss.c:2575 __fput+0x270/0xb80 fs/file_table.c:422 __fput_sync+0x47/0x50 fs/file_table.c:507 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __x64_sys_close+0x86/0x100 fs/open.c:1541 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 try_charge_memcg+0x49e/0x11a0 mm/memcontrol.c:2743 try_charge mm/memcontrol.c:2930 [inline] charge_memcg mm/memcontrol.c:7276 [inline] __mem_cgroup_charge+0xa6/0x140 mm/memcontrol.c:7291 mem_cgroup_charge include/linux/memcontrol.h:690 [inline] shmem_alloc_and_add_folio+0x1d9/0x7b0 mm/shmem.c:1683 shmem_get_folio_gfp+0x685/0x13e0 mm/shmem.c:2061 shmem_fault+0x205/0xa90 mm/shmem.c:2261 __do_fault+0x10a/0x4a0 mm/memory.c:4396 do_read_fault mm/memory.c:4758 [inline] do_fault mm/memory.c:4888 [inline] do_pte_missing mm/memory.c:3745 [inline] handle_pte_fault mm/memory.c:5164 [inline] __handle_mm_fault+0x32c2/0x4920 mm/memory.c:5305 handle_mm_fault+0x476/0xa00 mm/memory.c:5470 faultin_page mm/gup.c:958 [inline] __get_user_pages+0x4b5/0x1490 mm/gup.c:1241 __get_user_pages_locked mm/gup.c:1509 [inline] get_dump_page+0xfb/0x220 mm/gup.c:2031 dump_user_range+0x135/0x8a0 fs/coredump.c:949 elf_core_dump+0x278a/0x38d0 fs/binfmt_elf.c:2077 do_coredump+0x2c2c/0x3f60 fs/coredump.c:764 get_signal+0x2409/0x2760 kernel/signal.c:2893 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] irqentry_exit_to_user_mode+0x139/0x280 kernel/entry/common.c:225 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:617 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_change_params sound/core/oss/pcm_oss.c:1105 [inline] snd_pcm_oss_make_ready+0xe6/0x1b0 sound/core/oss/pcm_oss.c:1164 snd_pcm_oss_sync+0x1d7/0x7f0 sound/core/oss/pcm_oss.c:1730 snd_pcm_oss_release+0x291/0x320 sound/core/oss/pcm_oss.c:2575 __fput+0x270/0xb80 fs/file_table.c:422 __fput_sync+0x47/0x50 fs/file_table.c:507 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __x64_sys_close+0x86/0x100 fs/open.c:1541 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 try_charge_memcg+0x49e/0x11a0 mm/memcontrol.c:2743 try_charge mm/memcontrol.c:2930 [inline] charge_memcg mm/memcontrol.c:7276 [inline] __mem_cgroup_charge+0xa6/0x140 mm/memcontrol.c:7291 mem_cgroup_charge include/linux/memcontrol.h:690 [inline] shmem_alloc_and_add_folio+0x1d9/0x7b0 mm/shmem.c:1683 shmem_get_folio_gfp+0x685/0x13e0 mm/shmem.c:2061 shmem_fault+0x205/0xa90 mm/shmem.c:2261 __do_fault+0x10a/0x4a0 mm/memory.c:4396 do_read_fault mm/memory.c:4758 [inline] do_fault mm/memory.c:4888 [inline] do_pte_missing mm/memory.c:3745 [inline] handle_pte_fault mm/memory.c:5164 [inline] __handle_mm_fault+0x32c2/0x4920 mm/memory.c:5305 handle_mm_fault+0x476/0xa00 mm/memory.c:5470 faultin_page mm/gup.c:958 [inline] __get_user_pages+0x4b5/0x1490 mm/gup.c:1241 __get_user_pages_locked mm/gup.c:1509 [inline] get_dump_page+0xfb/0x220 mm/gup.c:2031 dump_user_range+0x135/0x8a0 fs/coredump.c:949 elf_core_dump+0x278a/0x38d0 fs/binfmt_elf.c:2077 do_coredump+0x2c2c/0x3f60 fs/coredump.c:764 get_signal+0x2409/0x2760 kernel/signal.c:2893 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] irqentry_exit_to_user_mode+0x139/0x280 kernel/entry/common.c:225 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:617 stack backtrace: CPU: 0 PID: 7299 Comm: syz-executor.0 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:try_charge_memcg+0x49e/0x11a0 mm/memcontrol.c:2743 Code: ff ff 49 8d be 00 02 00 00 48 89 de e8 8b 56 fe ff e9 cb fd ff ff e8 71 bd a4 ff 9c 58 f6 c4 02 0f 85 9f 04 00 00 fb 45 84 ed <0f> 84 82 fd ff ff 31 d2 48 b8 00 00 00 00 00 fc ff df 48 8b 74 24 RSP: 0018:ffffc90004a46cf8 EFLAGS: 00000202 RAX: 0000000000000006 RBX: ffff8880b9439160 RCX: 1ffffffff27b793b RDX: 0000000000000000 RSI: ffffffff8b0cb740 RDI: ffffffff8b6e88a0 RBP: 0000000000000001 R08: 0000000000000001 R09: fffffbfff27b4e36 R10: ffffffff93da71b7 R11: 0000000000000002 R12: 0000000000000200 R13: 0000000000000001 R14: ffff888021b2a000 R15: 0000000000000000 try_charge mm/memcontrol.c:2930 [inline] charge_memcg mm/memcontrol.c:7276 [inline] __mem_cgroup_charge+0xa6/0x140 mm/memcontrol.c:7291 mem_cgroup_charge include/linux/memcontrol.h:690 [inline] shmem_alloc_and_add_folio+0x1d9/0x7b0 mm/shmem.c:1683 shmem_get_folio_gfp+0x685/0x13e0 mm/shmem.c:2061 shmem_fault+0x205/0xa90 mm/shmem.c:2261 __do_fault+0x10a/0x4a0 mm/memory.c:4396 do_read_fault mm/memory.c:4758 [inline] do_fault mm/memory.c:4888 [inline] do_pte_missing mm/memory.c:3745 [inline] handle_pte_fault mm/memory.c:5164 [inline] __handle_mm_fault+0x32c2/0x4920 mm/memory.c:5305 handle_mm_fault+0x476/0xa00 mm/memory.c:5470 faultin_page mm/gup.c:958 [inline] __get_user_pages+0x4b5/0x1490 mm/gup.c:1241 __get_user_pages_locked mm/gup.c:1509 [inline] get_dump_page+0xfb/0x220 mm/gup.c:2031 dump_user_range+0x135/0x8a0 fs/coredump.c:949 elf_core_dump+0x278a/0x38d0 fs/binfmt_elf.c:2077 do_coredump+0x2c2c/0x3f60 fs/coredump.c:764 get_signal+0x2409/0x2760 kernel/signal.c:2893 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] irqentry_exit_to_user_mode+0x139/0x280 kernel/entry/common.c:225 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:617 RIP: 0033:0x7fc753e7de71 Code: c4 28 c3 e8 e1 20 00 00 90 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 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:0000000020000110 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007fc753fac050 RCX: 00007fc753e7de69 RDX: 0000000020000140 RSI: 0000000020000110 RDI: 0000000080000080 RBP: 00007fc753eca47a R08: 00000000200001c0 R09: 00000000200001c0 R10: 0000000020000180 R11: 0000000000000202 R12: 0000000000000000 R13: 000000000000006e R14: 00007fc753fac050 R15: 00007fff2f33cf98 vkms_vblank_simulate: vblank timer overrun ---------------- Code disassembly (best guess), 1 bytes skipped: 0: ff 49 8d decl -0x73(%rcx) 3: be 00 02 00 00 mov $0x200,%esi 8: 48 89 de mov %rbx,%rsi b: e8 8b 56 fe ff call 0xfffe569b 10: e9 cb fd ff ff jmp 0xfffffde0 15: e8 71 bd a4 ff call 0xffa4bd8b 1a: 9c pushf 1b: 58 pop %rax 1c: f6 c4 02 test $0x2,%ah 1f: 0f 85 9f 04 00 00 jne 0x4c4 25: fb sti 26: 45 84 ed test %r13b,%r13b * 29: 0f 84 82 fd ff ff je 0xfffffdb1 <-- trapping instruction 2f: 31 d2 xor %edx,%edx 31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 38: fc ff df 3b: 48 rex.W 3c: 8b .byte 0x8b 3d: 74 24 je 0x63