Call Trace:
======================================================
WARNING: possible circular locking dependency detected
5.16.0-next-20220113 #1 Not tainted
------------------------------------------------------
syz-executor.1/16157 is trying to acquire lock:
ffffffff851f50d8 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0xe/0x60 kernel/locking/semaphore.c:138

but task is already holding lock:
ffff88800fc22820 (&ctx->lock){-.-.}-{2:2}, at: __perf_install_in_context+0x12d/0x310 kernel/events/core.c:2784

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&ctx->lock){-.-.}-{2:2}:
       __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
       _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
       perf_event_context_sched_out kernel/events/core.c:3493 [inline]
       __perf_event_task_sched_out+0x519/0x1920 kernel/events/core.c:3601
       perf_event_task_sched_out include/linux/perf_event.h:1245 [inline]
       prepare_task_switch kernel/sched/core.c:4796 [inline]
       context_switch kernel/sched/core.c:4938 [inline]
       __schedule+0xead/0x2190 kernel/sched/core.c:6296
       schedule+0xd2/0x260 kernel/sched/core.c:6369
       exit_to_user_mode_loop kernel/entry/common.c:163 [inline]
       exit_to_user_mode_prepare+0x114/0x1c0 kernel/entry/common.c:207
       __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
       syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:300
       do_syscall_64+0x48/0x90 arch/x86/entry/common.c:86
       entry_SYSCALL_64_after_hwframe+0x44/0xae

-> #2 (&rq->__lock){-.-.}-{2:2}:
       _raw_spin_lock_nested+0x30/0x40 kernel/locking/spinlock.c:378
       raw_spin_rq_lock_nested+0x1e/0x30 kernel/sched/core.c:489
       raw_spin_rq_lock kernel/sched/sched.h:1318 [inline]
       rq_lock kernel/sched/sched.h:1616 [inline]
       task_fork_fair+0x63/0x4d0 kernel/sched/fair.c:11146
       sched_post_fork+0x343/0x490 kernel/sched/core.c:4462
       copy_process+0x5310/0x6cb0 kernel/fork.c:2379
       kernel_clone+0xe7/0xa60 kernel/fork.c:2555
       kernel_thread+0xb5/0xf0 kernel/fork.c:2607
       rest_init+0x24/0x3d0 init/main.c:692
       start_kernel+0x484/0x4a5 init/main.c:1141
       secondary_startup_64_no_verify+0xd5/0xdb

-> #1 (&p->pi_lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
       try_to_wake_up+0xac/0x14c0 kernel/sched/core.c:4017
       up+0x75/0xb0 kernel/locking/semaphore.c:190
       __up_console_sem+0x6e/0x80 kernel/printk/printk.c:255
       console_unlock+0x53e/0xae0 kernel/printk/printk.c:2730
       do_con_write+0xc01/0x1d40 drivers/tty/vt/vt.c:2965
       con_write+0x21/0x40 drivers/tty/vt/vt.c:3295
       process_output_block drivers/tty/n_tty.c:581 [inline]
       n_tty_write+0x416/0xfe0 drivers/tty/n_tty.c:2250
       do_tty_write drivers/tty/tty_io.c:1024 [inline]
       file_tty_write.constprop.0+0x529/0x910 drivers/tty/tty_io.c:1095
       call_write_iter include/linux/fs.h:2074 [inline]
       new_sync_write+0x437/0x660 fs/read_write.c:503
       vfs_write+0x7d1/0xae0 fs/read_write.c:590
       ksys_write+0x12d/0x250 fs/read_write.c:643
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x44/0xae

-> #0 ((console_sem).lock){-.-.}-{2:2}:
       check_prev_add kernel/locking/lockdep.c:3063 [inline]
       check_prevs_add kernel/locking/lockdep.c:3186 [inline]
       validate_chain kernel/locking/lockdep.c:3801 [inline]
       __lock_acquire+0x2a14/0x5b70 kernel/locking/lockdep.c:5027
       lock_acquire kernel/locking/lockdep.c:5639 [inline]
       lock_acquire+0x1a2/0x4d0 kernel/locking/lockdep.c:5604
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
       down_trylock+0xe/0x60 kernel/locking/semaphore.c:138
       __down_trylock_console_sem+0x3b/0xd0 kernel/printk/printk.c:238
       console_trylock kernel/printk/printk.c:2545 [inline]
       console_trylock_spinning kernel/printk/printk.c:1846 [inline]
       vprintk_emit+0x146/0x450 kernel/printk/printk.c:2247
       vprintk+0x80/0x90 kernel/printk/printk_safe.c:50
       _printk+0xba/0xed kernel/printk/printk.c:2269
       show_trace_log_lvl+0x57/0x2bb arch/x86/kernel/dumpstack.c:195
       ex_handler_msr+0x311/0x3a0 arch/x86/mm/extable.c:101
       fixup_exception+0x1ca/0xdd0 arch/x86/mm/extable.c:212
       __exc_general_protection arch/x86/kernel/traps.c:601 [inline]
       exc_general_protection+0xed/0x2f0 arch/x86/kernel/traps.c:562
       asm_exc_general_protection+0x1e/0x30 arch/x86/include/asm/idtentry.h:562
       wrmsrl arch/x86/include/asm/msr.h:271 [inline]
       __x86_pmu_enable_event arch/x86/events/perf_event.h:1120 [inline]
       x86_pmu_enable_all+0x2f7/0x3c0 arch/x86/events/core.c:743
       x86_pmu_enable+0x580/0xd90 arch/x86/events/core.c:1350
       perf_pmu_enable kernel/events/core.c:1207 [inline]
       perf_pmu_enable kernel/events/core.c:1203 [inline]
       ctx_resched+0x2b0/0x390 kernel/events/core.c:2754
       __perf_install_in_context+0x285/0x310 kernel/events/core.c:2821
       remote_function kernel/events/core.c:91 [inline]
       remote_function+0x125/0x1b0 kernel/events/core.c:71
       generic_exec_single+0x203/0x300 kernel/smp.c:518
       smp_call_function_single+0x189/0x460 kernel/smp.c:755
       task_function_call+0xe5/0x170 kernel/events/core.c:119
       perf_install_in_context+0x2cb/0x550 kernel/events/core.c:2922
       __do_sys_perf_event_open+0x1bf0/0x3040 kernel/events/core.c:12433
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x44/0xae

other info that might help us debug this:

Chain exists of:
  (console_sem).lock --> &rq->__lock --> &ctx->lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ctx->lock);
                               lock(&rq->__lock);
                               lock(&ctx->lock);
  lock((console_sem).lock);

 *** DEADLOCK ***

4 locks held by syz-executor.1/16157:
 #0: ffff88800dd978a0 (&sig->exec_update_lock){++++}-{3:3}, at: __do_sys_perf_event_open+0x1023/0x3040 kernel/events/core.c:12273
 #1: ffff88800fc228b0 (&ctx->mutex){+.+.}-{3:3}, at: __do_sys_perf_event_open+0x17cd/0x3040 kernel/events/core.c:12327
 #2: ffff88806ce3ee20 (&cpuctx_lock){-.-.}-{2:2}, at: __perf_install_in_context+0xf4/0x310 kernel/events/core.c:2782
 #3: ffff88800fc22820 (&ctx->lock){-.-.}-{2:2}, at: __perf_install_in_context+0x12d/0x310 kernel/events/core.c:2784

stack backtrace:
CPU: 0 PID: 16157 Comm: syz-executor.1 Not tainted 5.16.0-next-20220113 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106
 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2143
 check_prev_add kernel/locking/lockdep.c:3063 [inline]
 check_prevs_add kernel/locking/lockdep.c:3186 [inline]
 validate_chain kernel/locking/lockdep.c:3801 [inline]
 __lock_acquire+0x2a14/0x5b70 kernel/locking/lockdep.c:5027
 lock_acquire kernel/locking/lockdep.c:5639 [inline]
 lock_acquire+0x1a2/0x4d0 kernel/locking/lockdep.c:5604
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
 down_trylock+0xe/0x60 kernel/locking/semaphore.c:138
 __down_trylock_console_sem+0x3b/0xd0 kernel/printk/printk.c:238
 console_trylock kernel/printk/printk.c:2545 [inline]
 console_trylock_spinning kernel/printk/printk.c:1846 [inline]
 vprintk_emit+0x146/0x450 kernel/printk/printk.c:2247
 vprintk+0x80/0x90 kernel/printk/printk_safe.c:50
 _printk+0xba/0xed kernel/printk/printk.c:2269
 show_trace_log_lvl+0x57/0x2bb arch/x86/kernel/dumpstack.c:195
 ex_handler_msr+0x311/0x3a0 arch/x86/mm/extable.c:101
 fixup_exception+0x1ca/0xdd0 arch/x86/mm/extable.c:212
 __exc_general_protection arch/x86/kernel/traps.c:601 [inline]
 exc_general_protection+0xed/0x2f0 arch/x86/kernel/traps.c:562
 asm_exc_general_protection+0x1e/0x30 arch/x86/include/asm/idtentry.h:562
RIP: 0010:__wrmsr arch/x86/include/asm/msr.h:103 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:154 [inline]
RIP: 0010:wrmsrl arch/x86/include/asm/msr.h:271 [inline]
RIP: 0010:__x86_pmu_enable_event arch/x86/events/perf_event.h:1120 [inline]
RIP: 0010:x86_pmu_enable_all+0x2f7/0x3c0 arch/x86/events/core.c:743
Code: 00 8b 7c 24 1c 48 8b 44 24 10 0f ae e8 ff d0 89 44 24 10 e8 6b 3f 42 00 4c 89 fa 8b 4c 24 08 4c 89 f8 03 4c 24 10 48 c1 ea 20 <0f> 30 66 90 e8 50 3f 42 00 e9 cc fd ff ff 48 83 c4 20 5b 5d 41 5c
RSP: 0018:ffff88800c03f968 EFLAGS: 00010016
RAX: 0000000f004000ff RBX: ffff8880081c3f40 RCX: 00000000c0010202
RDX: 000000000000000f RSI: ffffffff8100e045 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff81015b2d R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88806ce21c20 R14: ffff88806ce21e20 R15: 0000000f004000ff
 x86_pmu_enable+0x580/0xd90 arch/x86/events/core.c:1350
 perf_pmu_enable kernel/events/core.c:1207 [inline]
 perf_pmu_enable kernel/events/core.c:1203 [inline]
 ctx_resched+0x2b0/0x390 kernel/events/core.c:2754
 __perf_install_in_context+0x285/0x310 kernel/events/core.c:2821
 remote_function kernel/events/core.c:91 [inline]
 remote_function+0x125/0x1b0 kernel/events/core.c:71
 generic_exec_single+0x203/0x300 kernel/smp.c:518
 smp_call_function_single+0x189/0x460 kernel/smp.c:755
 task_function_call+0xe5/0x170 kernel/events/core.c:119
 perf_install_in_context+0x2cb/0x550 kernel/events/core.c:2922
 __do_sys_perf_event_open+0x1bf0/0x3040 kernel/events/core.c:12433
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f59e256eb19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f59dfae4188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f59e2681f60 RCX: 00007f59e256eb19
RDX: 0000010000000000 RSI: 0000000000000000 RDI: 00000000200000c0
RBP: 00007f59e25c8f6d R08: 0000000000000003 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffde2baf1f R14: 00007f59dfae4300 R15: 0000000000022000
 </TASK>
 <TASK>
 x86_pmu_enable+0x580/0xd90 arch/x86/events/core.c:1350
 perf_pmu_enable kernel/events/core.c:1207 [inline]
 perf_pmu_enable kernel/events/core.c:1203 [inline]
 ctx_resched+0x2b0/0x390 kernel/events/core.c:2754
 __perf_install_in_context+0x285/0x310 kernel/events/core.c:2821
 remote_function kernel/events/core.c:91 [inline]
 remote_function+0x125/0x1b0 kernel/events/core.c:71
 generic_exec_single+0x203/0x300 kernel/smp.c:518
 smp_call_function_single+0x189/0x460 kernel/smp.c:755
 task_function_call+0xe5/0x170 kernel/events/core.c:119
 perf_install_in_context+0x2cb/0x550 kernel/events/core.c:2922
 __do_sys_perf_event_open+0x1bf0/0x3040 kernel/events/core.c:12433
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f59e256eb19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f59dfae4188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f59e2681f60 RCX: 00007f59e256eb19
RDX: 0000010000000000 RSI: 0000000000000000 RDI: 00000000200000c0
RBP: 00007f59e25c8f6d R08: 0000000000000003 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffde2baf1f R14: 00007f59dfae4300 R15: 0000000000022000
 </TASK>
Call Trace:
 <TASK>
 x86_pmu_enable+0x580/0xd90 arch/x86/events/core.c:1350
 perf_pmu_enable kernel/events/core.c:1207 [inline]
 perf_pmu_enable kernel/events/core.c:1203 [inline]
 perf_event_context_sched_in kernel/events/core.c:3893 [inline]
 __perf_event_task_sched_in+0x5e4/0x770 kernel/events/core.c:3931
 perf_event_task_sched_in include/linux/perf_event.h:1222 [inline]
 finish_task_switch.isra.0+0x45c/0x870 kernel/sched/core.c:4861
 context_switch kernel/sched/core.c:4989 [inline]
 __schedule+0x88a/0x2190 kernel/sched/core.c:6296
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6462
 __cond_resched+0x13/0x20 kernel/sched/core.c:8175
 might_resched include/linux/kernel.h:110 [inline]
 __mutex_lock_common kernel/locking/mutex.c:577 [inline]
 __mutex_lock+0xa3/0x1480 kernel/locking/mutex.c:733
 __do_sys_perf_event_open+0x1d13/0x3040 kernel/events/core.c:12445
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f59e256eb19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f59dfae4188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f59e2681f60 RCX: 00007f59e256eb19
RDX: 0000010000000000 RSI: 0000000000000000 RDI: 00000000200000c0
RBP: 00007f59e25c8f6d R08: 0000000000000003 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffde2baf1f R14: 00007f59dfae4300 R15: 0000000000022000
 </TASK>
Call Trace:
 <TASK>
 x86_pmu_enable+0x580/0xd90 arch/x86/events/core.c:1350
 perf_pmu_enable kernel/events/core.c:1207 [inline]
 perf_pmu_enable kernel/events/core.c:1203 [inline]
 perf_event_context_sched_in kernel/events/core.c:3893 [inline]
 __perf_event_task_sched_in+0x5e4/0x770 kernel/events/core.c:3931
 perf_event_task_sched_in include/linux/perf_event.h:1222 [inline]
 finish_task_switch.isra.0+0x45c/0x870 kernel/sched/core.c:4861
 context_switch kernel/sched/core.c:4989 [inline]
 __schedule+0x88a/0x2190 kernel/sched/core.c:6296
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6462
 __cond_resched+0x13/0x20 kernel/sched/core.c:8175
 might_resched include/linux/kernel.h:110 [inline]
 __mutex_lock_common kernel/locking/mutex.c:577 [inline]
 __mutex_lock+0xa3/0x1480 kernel/locking/mutex.c:733
 __do_sys_perf_event_open+0x1d13/0x3040 kernel/events/core.c:12445
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f59e256eb19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f59dfae4188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f59e2681f60 RCX: 00007f59e256eb19
RDX: 0000010000000000 RSI: 0000000000000000 RDI: 00000000200000c0
RBP: 00007f59e25c8f6d R08: 0000000000000003 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffde2baf1f R14: 00007f59dfae4300 R15: 0000000000022000
 </TASK>
Call Trace:
 <TASK>
 x86_pmu_enable+0x580/0xd90 arch/x86/events/core.c:1350
 perf_pmu_enable kernel/events/core.c:1207 [inline]
 perf_pmu_enable kernel/events/core.c:1203 [inline]
 perf_event_context_sched_in kernel/events/core.c:3893 [inline]
 __perf_event_task_sched_in+0x5e4/0x770 kernel/events/core.c:3931
 perf_event_task_sched_in include/linux/perf_event.h:1222 [inline]
 finish_task_switch.isra.0+0x45c/0x870 kernel/sched/core.c:4861
 context_switch kernel/sched/core.c:4989 [inline]
 __schedule+0x88a/0x2190 kernel/sched/core.c:6296
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6462
 __cond_resched+0x13/0x20 kernel/sched/core.c:8175
 might_resched include/linux/kernel.h:110 [inline]
 __mutex_lock_common kernel/locking/mutex.c:577 [inline]
 __mutex_lock+0xa3/0x1480 kernel/locking/mutex.c:733
 __do_sys_perf_event_open+0x1d13/0x3040 kernel/events/core.c:12445
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f59e256eb19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f59dfae4188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f59e2681f60 RCX: 00007f59e256eb19
RDX: 0000010000000000 RSI: 0000000000000000 RDI: 00000000200000c0
RBP: 00007f59e25c8f6d R08: 0000000000000003 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffde2baf1f R14: 00007f59dfae4300 R15: 0000000000022000
 </TASK>
syz-executor.3 (16158) used greatest stack depth: 23232 bytes left
----------------
Code disassembly (best guess):
   0:	00 8b 7c 24 1c 48    	add    %cl,0x481c247c(%rbx)
   6:	8b 44 24 10          	mov    0x10(%rsp),%eax
   a:	0f ae e8             	lfence
   d:	ff d0                	callq  *%rax
   f:	89 44 24 10          	mov    %eax,0x10(%rsp)
  13:	e8 6b 3f 42 00       	callq  0x423f83
  18:	4c 89 fa             	mov    %r15,%rdx
  1b:	8b 4c 24 08          	mov    0x8(%rsp),%ecx
  1f:	4c 89 f8             	mov    %r15,%rax
  22:	03 4c 24 10          	add    0x10(%rsp),%ecx
  26:	48 c1 ea 20          	shr    $0x20,%rdx
* 2a:	0f 30                	wrmsr <-- trapping instruction
  2c:	66 90                	xchg   %ax,%ax
  2e:	e8 50 3f 42 00       	callq  0x423f83
  33:	e9 cc fd ff ff       	jmpq   0xfffffe04
  38:	48 83 c4 20          	add    $0x20,%rsp
  3c:	5b                   	pop    %rbx
  3d:	5d                   	pop    %rbp
  3e:	41 5c                	pop    %r12