FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc6-syzkaller-g695caca9345a #0 Not tainted
------------------------------------------------------
syz.0.3990/15270 is trying to acquire lock:
ffffffff8ea14f40 (console_owner){-...}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:342 [inline]
ffffffff8ea14f40 (console_owner){-...}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:304 [inline]
ffffffff8ea14f40 (console_owner){-...}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:288 [inline]
ffffffff8ea14f40 (console_owner){-...}-{0:0}, at: console_flush_all+0x1a3/0xeb0 kernel/printk/printk.c:3187
but task is already holding lock:
ffff8880b873e7d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&rq->__lock){-.-.}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
_raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598
raw_spin_rq_lock kernel/sched/sched.h:1521 [inline]
task_rq_lock+0xc6/0x360 kernel/sched/core.c:700
cgroup_move_task+0x9b/0x5a0 kernel/sched/psi.c:1161
css_set_move_task+0x72e/0x950 kernel/cgroup/cgroup.c:898
cgroup_post_fork+0x284/0x8b0 kernel/cgroup/cgroup.c:6695
copy_process+0x398a/0x3cf0 kernel/fork.c:2629
kernel_clone+0x223/0x870 kernel/fork.c:2815
user_mode_thread+0x144/0x1c0 kernel/fork.c:2893
rest_init+0x23/0x300 init/main.c:708
start_kernel+0x484/0x510 init/main.c:1099
x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:515
x86_64_start_kernel+0x66/0x70 arch/x86/kernel/head64.c:496
common_startup_64+0x13e/0x147
-> #3 (&p->pi_lock){-.-.}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]
try_to_wake_up+0xc2/0x1470 kernel/sched/core.c:4214
__wake_up_common kernel/sched/wait.c:89 [inline]
__wake_up_common_lock+0x130/0x1e0 kernel/sched/wait.c:106
tty_port_default_wakeup+0xa6/0xf0 drivers/tty/tty_port.c:69
serial8250_tx_chars+0x6e2/0x930 drivers/tty/serial/8250/8250_port.c:1844
serial8250_handle_irq+0x631/0xb80 drivers/tty/serial/8250/8250_port.c:1952
serial8250_default_handle_irq+0xd1/0x1f0 drivers/tty/serial/8250/8250_port.c:1972
serial8250_interrupt+0xa9/0x1f0 drivers/tty/serial/8250/8250_core.c:86
__handle_irq_event_percpu+0x29a/0xa60 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0x89/0x1f0 kernel/irq/handle.c:210
handle_edge_irq+0x25f/0xc20 kernel/irq/chip.c:831
generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
handle_irq arch/x86/kernel/irq.c:249 [inline]
call_irq_handler arch/x86/kernel/irq.c:261 [inline]
__common_interrupt+0x136/0x230 arch/x86/kernel/irq.c:287
common_interrupt+0xb4/0xd0 arch/x86/kernel/irq.c:280
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline]
acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:111
acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:699
cpuidle_enter_state+0x109/0x470 drivers/cpuidle/cpuidle.c:268
cpuidle_enter+0x5d/0xa0 drivers/cpuidle/cpuidle.c:389
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:230 [inline]
do_idle+0x372/0x5c0 kernel/sched/idle.c:325
cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:423
rest_init+0x2dc/0x300 init/main.c:743
start_kernel+0x484/0x510 init/main.c:1099
x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:515
x86_64_start_kernel+0x66/0x70 arch/x86/kernel/head64.c:496
common_startup_64+0x13e/0x147
-> #2 (&tty->write_wait){-.-.}-{3:3}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
__wake_up_common_lock+0x25/0x1e0 kernel/sched/wait.c:105
tty_port_default_wakeup+0xa6/0xf0 drivers/tty/tty_port.c:69
serial8250_tx_chars+0x6e2/0x930 drivers/tty/serial/8250/8250_port.c:1844
serial8250_handle_irq+0x631/0xb80 drivers/tty/serial/8250/8250_port.c:1952
serial8250_default_handle_irq+0xd1/0x1f0 drivers/tty/serial/8250/8250_port.c:1972
serial8250_interrupt+0xa9/0x1f0 drivers/tty/serial/8250/8250_core.c:86
__handle_irq_event_percpu+0x29a/0xa60 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0x89/0x1f0 kernel/irq/handle.c:210
handle_edge_irq+0x25f/0xc20 kernel/irq/chip.c:831
generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
handle_irq arch/x86/kernel/irq.c:249 [inline]
call_irq_handler arch/x86/kernel/irq.c:261 [inline]
__common_interrupt+0x136/0x230 arch/x86/kernel/irq.c:287
common_interrupt+0xb4/0xd0 arch/x86/kernel/irq.c:280
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
uart_port_unlock_irqrestore include/linux/serial_core.h:786 [inline]
uart_write+0x3e4/0xa40 drivers/tty/serial/serial_core.c:636
process_output_block drivers/tty/n_tty.c:574 [inline]
n_tty_write+0xd62/0x1230 drivers/tty/n_tty.c:2389
iterate_tty_write drivers/tty/tty_io.c:1015 [inline]
file_tty_write+0x546/0x9b0 drivers/tty/tty_io.c:1090
new_sync_write fs/read_write.c:586 [inline]
vfs_write+0xacf/0xd10 fs/read_write.c:679
ksys_write+0x18f/0x2b0 fs/read_write.c:731
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&port_lock_key){-.-.}-{3:3}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
uart_port_lock_irqsave include/linux/serial_core.h:715 [inline]
serial8250_console_write+0x1ae/0x1e00 drivers/tty/serial/8250/8250_port.c:3424
console_emit_next_record kernel/printk/printk.c:3122 [inline]
console_flush_all+0x86b/0xeb0 kernel/printk/printk.c:3210
__console_flush_and_unlock kernel/printk/printk.c:3269 [inline]
console_unlock+0x14f/0x3b0 kernel/printk/printk.c:3309
vprintk_emit+0x730/0xa10 kernel/printk/printk.c:2432
_printk+0xd5/0x120 kernel/printk/printk.c:2457
register_console+0xbf5/0xfd0 kernel/printk/printk.c:4099
univ8250_console_init+0x52/0x90 drivers/tty/serial/8250/8250_core.c:513
console_init+0x1b8/0x6f0 kernel/printk/printk.c:4292
start_kernel+0x2dd/0x510 init/main.c:1034
x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:515
x86_64_start_kernel+0x66/0x70 arch/x86/kernel/head64.c:496
common_startup_64+0x13e/0x147
-> #0 (console_owner){-...}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
console_lock_spinning_enable kernel/printk/printk.c:1924 [inline]
console_emit_next_record kernel/printk/printk.c:3116 [inline]
console_flush_all+0x7f8/0xeb0 kernel/printk/printk.c:3210
__console_flush_and_unlock kernel/printk/printk.c:3269 [inline]
console_unlock+0x14f/0x3b0 kernel/printk/printk.c:3309
vprintk_emit+0x730/0xa10 kernel/printk/printk.c:2432
_printk+0xd5/0x120 kernel/printk/printk.c:2457
fail_dump lib/fault-inject.c:66 [inline]
should_fail_ex+0x3eb/0x550 lib/fault-inject.c:174
__copy_to_user_inatomic include/linux/uaccess.h:132 [inline]
copy_to_user_nofault+0x88/0x140 mm/maccess.c:156
bpf_prog_6303d92f98284ad8+0x44/0x48
bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
__bpf_prog_run include/linux/filter.h:701 [inline]
bpf_prog_run include/linux/filter.h:708 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2371 [inline]
bpf_trace_run4+0x334/0x590 kernel/trace/bpf_trace.c:2414
__bpf_trace_sched_switch+0x294/0x3d0 include/trace/events/sched.h:222
__traceiter_sched_switch+0x98/0xd0 include/trace/events/sched.h:222
__do_trace_sched_switch include/trace/events/sched.h:222 [inline]
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x235b/0x4c40 kernel/sched/core.c:6762
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7087
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
syscall_enter_from_user_mode_work include/linux/entry-common.h:166 [inline]
syscall_enter_from_user_mode include/linux/entry-common.h:199 [inline]
do_syscall_64+0xbc/0x230 arch/x86/entry/common.c:79
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
console_owner --> &p->pi_lock --> &rq->__lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&rq->__lock);
lock(&p->pi_lock);
lock(&rq->__lock);
lock(console_owner);
*** DEADLOCK ***
4 locks held by syz.0.3990/15270:
#0: ffff8880b873e7d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598
#1: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#1: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2370 [inline]
#1: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run4+0x244/0x590 kernel/trace/bpf_trace.c:2414
#2: ffffffff8ea14fa0 (console_lock){+.+.}-{0:0}, at: _printk+0xd5/0x120 kernel/printk/printk.c:2457
#3: ffffffff8ea14bb0 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:342 [inline]
#3: ffffffff8ea14bb0 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:304 [inline]
#3: ffffffff8ea14bb0 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:288 [inline]
#3: ffffffff8ea14bb0 (console_srcu){....}-{0:0}, at: console_flush_all+0x1a3/0xeb0 kernel/printk/printk.c:3187
stack backtrace:
CPU: 1 UID: 0 PID: 15270 Comm: syz.0.3990 Not tainted 6.14.0-rc6-syzkaller-g695caca9345a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
console_lock_spinning_enable kernel/printk/printk.c:1924 [inline]
console_emit_next_record kernel/printk/printk.c:3116 [inline]
console_flush_all+0x7f8/0xeb0 kernel/printk/printk.c:3210
__console_flush_and_unlock kernel/printk/printk.c:3269 [inline]
console_unlock+0x14f/0x3b0 kernel/printk/printk.c:3309
vprintk_emit+0x730/0xa10 kernel/printk/printk.c:2432
_printk+0xd5/0x120 kernel/printk/printk.c:2457
fail_dump lib/fault-inject.c:66 [inline]
should_fail_ex+0x3eb/0x550 lib/fault-inject.c:174
__copy_to_user_inatomic include/linux/uaccess.h:132 [inline]
copy_to_user_nofault+0x88/0x140 mm/maccess.c:156
bpf_prog_6303d92f98284ad8+0x44/0x48
bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
__bpf_prog_run include/linux/filter.h:701 [inline]
bpf_prog_run include/linux/filter.h:708 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2371 [inline]
bpf_trace_run4+0x334/0x590 kernel/trace/bpf_trace.c:2414
__bpf_trace_sched_switch+0x294/0x3d0 include/trace/events/sched.h:222
__traceiter_sched_switch+0x98/0xd0 include/trace/events/sched.h:222
__do_trace_sched_switch include/trace/events/sched.h:222 [inline]
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x235b/0x4c40 kernel/sched/core.c:6762
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7087
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:syscall_enter_from_user_mode_work include/linux/entry-common.h:168 [inline]
RIP: 0010:syscall_enter_from_user_mode include/linux/entry-common.h:199 [inline]
RIP: 0010:do_syscall_64+0xbc/0x230 arch/x86/entry/common.c:79
Code: ed 00 00 00 48 8b 7d 08 e8 31 65 00 00 0f 1f 44 00 00 0f 1f 44 00 00 90 e8 51 21 c9 f5 90 90 e8 fa 20 c9 f5 fb 49 8b 54 24 08 c2 3f 74 0e 4c 89 f7 4c 89 fe e8 54 d8 aa f5 49 89 c7 90 90 41
RSP: 0018:ffffc90003097f10 EFLAGS: 00000282
RAX: 468a60b592cec600 RBX: ffffc90003097f10 RCX: ffffffff9a61d903
RDX: 0000000000000000 RSI: ffffffff8c2ab3a0 RDI: ffffffff8c802d60
RBP: ffffc90003097f48 R08: ffffffff903bd077 R09: 1ffffffff2077a0e
R10: dffffc0000000000 R11: fffffbfff2077a0f R12: ffff888027c0da00
R13: 0000000000000000 R14: ffffc90003097f58 R15: 000000000000002e
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f853a575bd9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f853b334048 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f853a703f60 RCX: 00007f853a575bd9
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000005
RBP: 00007f853b3340a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 000000000000000b R14: 00007f853a703f60 R15: 00007ffdaaa35a98
CPU: 1 UID: 0 PID: 15270 Comm: syz.0.3990 Not tainted 6.14.0-rc6-syzkaller-g695caca9345a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
fail_dump lib/fault-inject.c:73 [inline]
should_fail_ex+0x40a/0x550 lib/fault-inject.c:174
__copy_to_user_inatomic include/linux/uaccess.h:132 [inline]
copy_to_user_nofault+0x88/0x140 mm/maccess.c:156
bpf_prog_6303d92f98284ad8+0x44/0x48
bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
__bpf_prog_run include/linux/filter.h:701 [inline]
bpf_prog_run include/linux/filter.h:708 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2371 [inline]
bpf_trace_run4+0x334/0x590 kernel/trace/bpf_trace.c:2414
__bpf_trace_sched_switch+0x294/0x3d0 include/trace/events/sched.h:222
__traceiter_sched_switch+0x98/0xd0 include/trace/events/sched.h:222
__do_trace_sched_switch include/trace/events/sched.h:222 [inline]
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x235b/0x4c40 kernel/sched/core.c:6762
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7087
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:syscall_enter_from_user_mode_work include/linux/entry-common.h:168 [inline]
RIP: 0010:syscall_enter_from_user_mode include/linux/entry-common.h:199 [inline]
RIP: 0010:do_syscall_64+0xbc/0x230 arch/x86/entry/common.c:79
Code: ed 00 00 00 48 8b 7d 08 e8 31 65 00 00 0f 1f 44 00 00 0f 1f 44 00 00 90 e8 51 21 c9 f5 90 90 e8 fa 20 c9 f5 fb 49 8b 54 24 08 c2 3f 74 0e 4c 89 f7 4c 89 fe e8 54 d8 aa f5 49 89 c7 90 90 41
RSP: 0018:ffffc90003097f10 EFLAGS: 00000282
RAX: 468a60b592cec600 RBX: ffffc90003097f10 RCX: ffffffff9a61d903
RDX: 0000000000000000 RSI: ffffffff8c2ab3a0 RDI: ffffffff8c802d60
RBP: ffffc90003097f48 R08: ffffffff903bd077 R09: 1ffffffff2077a0e
R10: dffffc0000000000 R11: fffffbfff2077a0f R12: ffff888027c0da00
R13: 0000000000000000 R14: ffffc90003097f58 R15: 000000000000002e
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f853a575bd9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f853b334048 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f853a703f60 RCX: 00007f853a575bd9
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000005
RBP: 00007f853b3340a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 000000000000000b R14: 00007f853a703f60 R15: 00007ffdaaa35a98
----------------
Code disassembly (best guess):
0: ed in (%dx),%eax
1: 00 00 add %al,(%rax)
3: 00 48 8b add %cl,-0x75(%rax)
6: 7d 08 jge 0x10
8: e8 31 65 00 00 call 0x653e
d: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
12: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
17: 90 nop
18: e8 51 21 c9 f5 call 0xf5c9216e
1d: 90 nop
1e: 90 nop
1f: e8 fa 20 c9 f5 call 0xf5c9211e
24: fb sti
25: 49 8b 54 24 08 mov 0x8(%r12),%rdx
* 2a: f6 c2 3f test $0x3f,%dl <-- trapping instruction
2d: 74 0e je 0x3d
2f: 4c 89 f7 mov %r14,%rdi
32: 4c 89 fe mov %r15,%rsi
35: e8 54 d8 aa f5 call 0xf5aad88e
3a: 49 89 c7 mov %rax,%r15
3d: 90 nop
3e: 90 nop
3f: 41 rex.B