INFO: task udevd:5784 blocked for more than 145 seconds.
Not tainted 6.13.0-rc1-syzkaller-gd8d936c51388 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D
stack:27136 pid:5784 tgid:5784 ppid:2844 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0x102c/0x34b0 kernel/sched/core.c:6756
__schedule_loop kernel/sched/core.c:6833 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6848
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905
__mutex_lock_common kernel/locking/mutex.c:665 [inline]
__mutex_lock+0x62b/0xa60 kernel/locking/mutex.c:735
device_lock include/linux/device.h:1014 [inline]
uevent_show+0x188/0x3b0 drivers/base/core.c:2729
dev_attr_show+0x53/0xe0 drivers/base/core.c:2423
sysfs_kf_seq_show+0x23e/0x410 fs/sysfs/file.c:59
seq_read_iter+0x4f4/0x12b0 fs/seq_file.c:230
kernfs_fop_read_iter+0x414/0x580 fs/kernfs/file.c:279
new_sync_read fs/read_write.c:484 [inline]
vfs_read+0x87f/0xbe0 fs/read_write.c:565
ksys_read+0x12b/0x250 fs/read_write.c:708
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdcbc30ab6a
RSP: 002b:00007ffe54568538 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000056163138cdc0 RCX: 00007fdcbc30ab6a
RDX: 0000000000001000 RSI: 000056163135c6b0 RDI: 0000000000000008
RBP: 000056163138cdc0 R08: 0000000000000008 R09: 0000000000000000
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000003fff R14: 00007ffe54568a18 R15: 000000000000000a
INFO: task udevd:5817 blocked for more than 145 seconds.
Not tainted 6.13.0-rc1-syzkaller-gd8d936c51388 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D
stack:28176 pid:5817 tgid:5817 ppid:2844 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0x102c/0x34b0 kernel/sched/core.c:6756
__schedule_loop kernel/sched/core.c:6833 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6848
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905
__mutex_lock_common kernel/locking/mutex.c:665 [inline]
__mutex_lock+0x62b/0xa60 kernel/locking/mutex.c:735
device_lock include/linux/device.h:1014 [inline]
uevent_show+0x188/0x3b0 drivers/base/core.c:2729
dev_attr_show+0x53/0xe0 drivers/base/core.c:2423
sysfs_kf_seq_show+0x23e/0x410 fs/sysfs/file.c:59
seq_read_iter+0x4f4/0x12b0 fs/seq_file.c:230
kernfs_fop_read_iter+0x414/0x580 fs/kernfs/file.c:279
new_sync_read fs/read_write.c:484 [inline]
vfs_read+0x87f/0xbe0 fs/read_write.c:565
ksys_read+0x12b/0x250 fs/read_write.c:708
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdcbc30ab6a
RSP: 002b:00007ffe54568538 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000056163138cdc0 RCX: 00007fdcbc30ab6a
RDX: 0000000000001000 RSI: 000056163135c6b0 RDI: 0000000000000008
RBP: 000056163138cdc0 R08: 0000000000000008 R09: 0000000000002000
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000003fff R14: 00007ffe54568a18 R15: 000000000000000a
INFO: task udevd:5818 blocked for more than 145 seconds.
Not tainted 6.13.0-rc1-syzkaller-gd8d936c51388 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D
stack:28176 pid:5818 tgid:5818 ppid:2844 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0x102c/0x34b0 kernel/sched/core.c:6756
__schedule_loop kernel/sched/core.c:6833 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6848
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905
__mutex_lock_common kernel/locking/mutex.c:665 [inline]
__mutex_lock+0x62b/0xa60 kernel/locking/mutex.c:735
device_lock include/linux/device.h:1014 [inline]
uevent_show+0x188/0x3b0 drivers/base/core.c:2729
dev_attr_show+0x53/0xe0 drivers/base/core.c:2423
sysfs_kf_seq_show+0x23e/0x410 fs/sysfs/file.c:59
seq_read_iter+0x4f4/0x12b0 fs/seq_file.c:230
kernfs_fop_read_iter+0x414/0x580 fs/kernfs/file.c:279
new_sync_read fs/read_write.c:484 [inline]
vfs_read+0x87f/0xbe0 fs/read_write.c:565
ksys_read+0x12b/0x250 fs/read_write.c:708
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdcbc30ab6a
RSP: 002b:00007ffe54568538 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000056163138cdc0 RCX: 00007fdcbc30ab6a
RDX: 0000000000001000 RSI: 000056163135c6b0 RDI: 0000000000000008
RBP: 000056163138cdc0 R08: 0000000000000008 R09: 0000000000000040
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000003fff R14: 00007ffe54568a18 R15: 000000000000000a
Showing all locks held in the system:
7 locks held by kworker/0:0/8:
#0:
ffff88810668f548 ((wq_completion)usb_hub_wq
){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3204
#1: ffffc9000008fd80 (
(work_completion)(&hub->events)){+.+.}-{0:0}
, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
#2:
ffff88810b708190 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1014 [inline]
, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5849
#3: ffff88811648b190 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1014 [inline]
, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005
#4: ffff8881062c0160
(&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1014 [inline]
, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005
#5:
ffff88811e909a20 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1014 [inline]
, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005
#6:
ffffffff89bdf068 (input_mutex){+.+.}-{4:4}
, at: input_register_device+0x98a/0x1110 drivers/input/input.c:2468
7 locks held by kworker/1:0/24:
#0: ffff88810668f548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}
, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3204
#1:
ffffc9000019fd80 ((work_completion)(&hub->events)){+.+.}-{0:0}
, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
#2: ffff88810b70a190
(&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1014 [inline]
, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5849
#3: ffff888102ece190 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1014 [inline]
, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005
#4:
ffff888105aa5160 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1014 [inline]
, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005
#5: ffff888125c11a20 (
&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1014 [inline]
, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005
#6:
ffffffff89bdf068 (
input_mutex){+.+.}-{4:4}
, at: input_register_device+0x98a/0x1110 drivers/input/input.c:2468
1 lock held by khungtaskd/30:
#0: ffffffff88ebc400
(rcu_read_lock){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6744
10 locks held by kworker/1:1/36:
2 locks held by kworker/u8:2/37:
#0: ffff888100089148 (
(wq_completion)events_unbound
){+.+.}-{0:0}
, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3204
#1: ffffc90000277d80 ((work_completion)(&sub_info->work)
){+.+.}-{0:0}
, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
2 locks held by kworker/u8:4/48:
#0: ffff888100089148 ((wq_completion)events_unbound
){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3204
#1: ffffc90000527d80
((work_completion)(&sub_info->work)){+.+.}-{0:0}
, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
11 locks held by kworker/1:2/1119:
2 locks held by kworker/u8:8/1685:
#0:
ffff888100089148 ((wq_completion)events_unbound){+.+.}-{0:0}
, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3204
#1: ffffc90002c1fd80 ((work_completion)(&sub_info->work)
){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
2 locks held by getty/2902:
#0: ffff8881120d30a0 (&tty->ldisc_sem){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1:
ffffc900000432f0 (&ldata->atomic_read_lock){+.+.}-{4:4}
, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
2 locks held by kworker/0:2/3001:
#0: ffff888100080948 ((wq_completion)events){+.+.}-{0:0}
, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3204
#1: ffffc900018ffd80 (console_work){+.+.}-{0:0}
, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
4 locks held by udevd/5784:
#0:
ffff888114b432f0 (&p->lock){+.+.}-{4:4}
, at: seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182
#1: ffff88811b2ea488
(&of->mutex#2){+.+.}-{4:4}
, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2: ffff888112a05698
(
kn->active#3
){.+.+}-{0:0}
, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3: ffff8881000a5190 (
&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1014 [inline]
, at: uevent_show+0x188/0x3b0 drivers/base/core.c:2729
4 locks held by udevd/5817:
#0:
ffff88811b3ea8b8 (&p->lock){+.+.}-{4:4}
, at: seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182
#1: ffff88811a40a488 (
&of->mutex#2){+.+.}-{4:4}
, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2: ffff88810efd9c38 (kn->active
#3){.+.+}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3: ffff88811648b190 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1014 [inline]
, at: uevent_show+0x188/0x3b0 drivers/base/core.c:2729
4 locks held by udevd/5818:
#0: ffff88811b3ea9e0 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182
#1: ffff88811a40b088 (&of->mutex#2){+.+.}-{4:4}
, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2: ffff888111d78698 (
kn->active#3){.+.+}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3: ffff888102ece190 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1014 [inline]
, at: uevent_show+0x188/0x3b0 drivers/base/core.c:2729
7 locks held by kworker/0:4/5823:
#0: ffff88810668f548 ((wq_completion)usb_hub_wq
){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3204
#1: ffffc900026dfd80 (
(work_completion)(&hub->events)){+.+.}-{0:0}
, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
#2:
ffff88810af54190
(&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:1014 [inline]
, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5849
#3: ffff888105aad190 (&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:1014 [inline]
, at: usb_disconnect+0x10a/0x920 drivers/usb/core/hub.c:2295
#4: ffff88811648c160 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1014 [inline]
, at: __device_driver_lock drivers/base/dd.c:1095 [inline]
, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1293
#5: ffff888111e75a20
(&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1014 [inline]
, at: __device_driver_lock drivers/base/dd.c:1095 [inline]
, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1293
#6:
ffffffff89bdf068 (input_mutex
){+.+.}-{4:4}, at: __input_unregister_device+0x136/0x450 drivers/input/input.c:2277
1 lock held by syz-executor/9158:
1 lock held by syz-executor/9160:
1 lock held by modprobe/9199:
1 lock held by modprobe/9200:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc1-syzkaller-gd8d936c51388 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline]
watchdog+0xf14/0x1240 kernel/hung_task.c:397
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
do_exit+0xad8/0x2ce0 kernel/exit.c:937
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 36 Comm: kworker/1:1 Not tainted 6.13.0-rc1-syzkaller-gd8d936c51388 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: usb_hub_wq hub_event
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xc/0x70 kernel/kcov.c:217
Code: cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 48 8b 15 d4 6d a8 7e <65> 8b 05 d5 6d a8 7e a9 00 01 ff 00 48 8b 34 24 74 1d f6 c4 01 74
RSP: 0018:ffffc900001b7dc0 EFLAGS: 00000006
RAX: 0000000000000000 RBX: 0000000000000011 RCX: ffffffff814fda97
RDX: ffff888102edd7c0 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffffff8813ab8b R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000005f37360 R12: 000000000000002b
R13: 000000000000003a R14: dffffc0000000000 R15: ffffc900001b7e98
FS: 0000000000000000(0000) GS:ffff8881f5900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe54569fd8 CR3: 0000000116a34000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
get_symbol_offset+0x85/0x150 kernel/kallsyms.c:134
kallsyms_lookup_buildid+0xdd/0x2b0 kernel/kallsyms.c:371
__sprint_symbol.constprop.0+0xcf/0x1f0 kernel/kallsyms.c:444
symbol_string+0x428/0x480 lib/vsprintf.c:996
pointer+0x381/0xbf0 lib/vsprintf.c:2446
vsnprintf+0x4c4/0x1880 lib/vsprintf.c:2852
vscnprintf+0x40/0x90 lib/vsprintf.c:2954
printk_sprint+0x31/0x340 kernel/printk/printk.c:2216
vprintk_store+0x510/0xc00 kernel/printk/printk.c:2336
vprintk_emit+0x155/0x6f0 kernel/printk/printk.c:2408
vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:86
_printk+0xc8/0x100 kernel/printk/printk.c:2457
printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
show_trace_log_lvl+0x21f/0x3d0 arch/x86/kernel/dumpstack.c:285
sched_show_task kernel/sched/core.c:7711 [inline]
sched_show_task+0x3f0/0x5f0 kernel/sched/core.c:7686
show_state_filter+0xee/0x320 kernel/sched/core.c:7756
k_spec drivers/tty/vt/keyboard.c:667 [inline]
k_spec+0xed/0x150 drivers/tty/vt/keyboard.c:656
kbd_keycode drivers/tty/vt/keyboard.c:1522 [inline]
kbd_event+0xcbd/0x17a0 drivers/tty/vt/keyboard.c:1541
input_handle_events_default+0x116/0x1b0 drivers/input/input.c:2646
input_pass_values+0x738/0x880 drivers/input/input.c:126
input_event_dispose drivers/input/input.c:341 [inline]
input_handle_event+0xf0b/0x14d0 drivers/input/input.c:369
input_repeat_key+0x251/0x340 drivers/input/input.c:2321
call_timer_fn+0x1a0/0x610 kernel/time/timer.c:1793
expire_timers kernel/time/timer.c:1844 [inline]
__run_timers+0x6e8/0x930 kernel/time/timer.c:2418
__run_timer_base kernel/time/timer.c:2430 [inline]
__run_timer_base kernel/time/timer.c:2422 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2439
run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2449
handle_softirqs+0x206/0x8d0 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xfa/0x160 kernel/softirq.c:655
irq_exit_rcu+0x9/0x30 kernel/softirq.c:671
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_flush_all+0x9a4/0xc60 kernel/printk/printk.c:3211
Code: 00 e8 90 de 27 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 1e 39 20 00 48 85 db 0f 85 55 01 00 00 e8 a0 36 20 00 fb 4c 89 e0 <48> c1 e8 03 42 80 3c 38 00 0f 84 11 ff ff ff 4c 89 e7 e8 25 41 7a
RSP: 0018:ffffc90000267518 EFLAGS: 00000293
RAX: ffffffff893a7798 RBX: 0000000000000000 RCX: ffffffff813b1bb2
RDX: ffff888102edd7c0 RSI: ffffffff813b1bc0 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000006 R12: ffffffff893a7798
R13: ffffffff893a7740 R14: ffffc900002675a8 R15: dffffc0000000000
__console_flush_and_unlock kernel/printk/printk.c:3269 [inline]
console_unlock+0xd9/0x210 kernel/printk/printk.c:3309
vprintk_emit+0x424/0x6f0 kernel/printk/printk.c:2432
dev_vprintk_emit drivers/base/core.c:4935 [inline]
dev_printk_emit+0xfb/0x140 drivers/base/core.c:4946
__dev_printk+0xf5/0x270 drivers/base/core.c:4958
_dev_info+0xe5/0x120 drivers/base/core.c:5004
usb_disconnect+0xec/0x920 drivers/usb/core/hub.c:2286
hub_port_connect drivers/usb/core/hub.c:5361 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5661 [inline]
port_event drivers/usb/core/hub.c:5821 [inline]
hub_event+0x1bed/0x4f40 drivers/usb/core/hub.c:5903
process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
process_scheduled_works kernel/workqueue.c:3310 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244