sched: DL replenish lagged too much
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P15854/2:b..l P15835/1:b..l P4988/1:b..l P13767/1:b..l P13670/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=130857, q=1246 ncpus=1)
task:udevd state:R running task stack:25800 pid:13670 tgid:13670 ppid:4988 task_flags:0x40014c flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17dd/0x5940 kernel/sched/core.c:7270
preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7449
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:201 [inline]
_raw_spin_unlock+0x41/0x50 kernel/locking/spinlock.c:213
spin_unlock include/linux/spinlock.h:401 [inline]
zap_pte_range mm/memory.c:2071 [inline]
zap_pmd_range mm/memory.c:2127 [inline]
zap_pud_range mm/memory.c:2155 [inline]
zap_p4d_range mm/memory.c:2176 [inline]
__zap_vma_range+0x40e1/0x4f80 mm/memory.c:2216
unmap_vmas+0x390/0x550 mm/memory.c:2285
exit_mmap+0x293/0x9f0 mm/mmap.c:1315
__mmput+0x118/0x420 kernel/fork.c:1192
exit_mm+0x221/0x2d0 kernel/exit.c:614
do_exit+0x6cd/0x2360 kernel/exit.c:996
do_group_exit+0x22d/0x2f0 kernel/exit.c:1151
__do_sys_exit_group kernel/exit.c:1162 [inline]
__se_sys_exit_group kernel/exit.c:1160 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1160
x64_sys_call+0x18c6/0x18d0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efe2cef16c5
RSP: 002b:00007ffce9c025d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000563f4ddf8f10 RCX: 00007efe2cef16c5
RDX: 00000000000000e7 RSI: fffffffffffffe68 RDI: 0000000000000000
RBP: 0000563f4ddf1910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffce9c02620 R14: 0000000000000000 R15: 0000000000000000
task:udevd state:R running task stack:26440 pid:13767 tgid:13767 ppid:4988 task_flags:0x40014c flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17dd/0x5940 kernel/sched/core.c:7270
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7592
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5913
Code: ff ff ff e8 10 1a 43 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 62 25 f2 11 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 3f 27 46 0a cc 48 8d 3d c7 68 da
RSP: 0018:ffffc90004aa74c0 EFLAGS: 00000296
RAX: 383f4969c9561300 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 00000000e99ea524 RSI: ffffffff8e703742 RDI: ffffffff8c6db080
RBP: ffff888027910000 R08: 2400000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8ed5c9a0 R12: ffffffff8ed5c9a0
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
__call_rcu_common kernel/rcu/tree.c:3181 [inline]
call_rcu+0xee/0x8b0 kernel/rcu/tree.c:3301
slab_free_hook mm/slub.c:2712 [inline]
slab_free mm/slub.c:6499 [inline]
kmem_cache_free+0x471/0x650 mm/slub.c:6626
tear_down_vmas+0x31f/0x530 mm/mmap.c:1277
exit_mmap+0x4ca/0x9f0 mm/mmap.c:1335
__mmput+0x118/0x420 kernel/fork.c:1192
exit_mm+0x221/0x2d0 kernel/exit.c:614
do_exit+0x6cd/0x2360 kernel/exit.c:996
do_group_exit+0x22d/0x2f0 kernel/exit.c:1151
__do_sys_exit_group kernel/exit.c:1162 [inline]
__se_sys_exit_group kernel/exit.c:1160 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1160
x64_sys_call+0x18c6/0x18d0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efe2cef16c5
RSP: 002b:00007ffce9c025d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000563f4de2b390 RCX: 00007efe2cef16c5
RDX: 00000000000000e7 RSI: fffffffffffffe68 RDI: 0000000000000000
RBP: 0000563f4ddf1910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffce9c02620 R14: 0000000000000000 R15: 0000000000000000
task:udevd state:R running task stack:23400 pid:4988 tgid:4988 ppid:1 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17dd/0x5940 kernel/sched/core.c:7270
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7592
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:58 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:409 [inline]
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:419 [inline]
RIP: 0010:unwind_next_frame+0xba7/0x2550 arch/x86/kernel/unwind_orc.c:614
Code: 00 fc ff df 48 8b 4c 24 10 0f b6 04 01 84 c0 0f 85 3b 14 00 00 41 83 3e 00 0f 95 c0 49 39 d7 0f 96 c1 20 c1 49 39 d5 0f 97 c0 <20> c8 3c 01 75 18 48 8d 42 08 4c 39 f8 0f 97 c1 4c 39 e8 0f 96 c0
RSP: 0018:ffffc90004227240 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 1ffff92000844e5e RCX: 1ffff92000844e01
RDX: ffffc90004227c20 RSI: 0000000000000002 RDI: ffffc900042272f8
RBP: 1ffffffff22446c6 R08: ffffc90004227c28 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8ed5c9a0 R12: 1ffff92000844e5f
R13: ffffc90004228000 R14: ffffc900042272e8 R15: ffffc90004220000
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
save_stack+0x122/0x230 mm/page_owner.c:183
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:338
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1400 [inline]
__free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2944
__slab_free+0x274/0x2c0 mm/slub.c:5815
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4683 [inline]
slab_alloc_node mm/slub.c:4996 [inline]
__do_kmalloc_node mm/slub.c:5413 [inline]
__kmalloc_noprof+0x307/0x720 mm/slub.c:5439
_kmalloc_noprof include/linux/slab.h:995 [inline]
tomoyo_realpath_from_path+0xef/0x640 security/tomoyo/realpath.c:251
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x283/0x560 security/tomoyo/file.c:827
security_inode_getattr+0x12b/0x310 security/security.c:1909
vfs_getattr+0x23/0x70 fs/stat.c:259
vfs_statx_path+0x2b/0x230 fs/stat.c:299
vfs_statx+0x12e/0x200 fs/stat.c:356
vfs_fstatat+0x11b/0x170 fs/stat.c:373
__do_sys_newfstatat fs/stat.c:538 [inline]
__se_sys_newfstatat+0x118/0x3a0 fs/stat.c:532
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efe2cf11b0a
RSP: 002b:00007ffce9c026b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 0000563f13a49410 RCX: 00007efe2cf11b0a
RDX: 00007ffce9c026c0 RSI: 0000563f13a372a8 RDI: 00000000ffffff9c
RBP: 0000563f4de04148 R08: 00063478c1c69200 R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffce9c026c0 R14: 0000000000000000 R15: 00063478c1c69200
task:syz.8.1396 state:R running task stack:28040 pid:15835 tgid:15833 ppid:15126 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17dd/0x5940 kernel/sched/core.c:7270
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7592
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_release+0x2e1/0x3c0 kernel/locking/lockdep.c:5934
Code: 37 f2 11 00 00 00 00 eb b5 e8 0b e7 42 0a f7 c3 00 02 00 00 74 b9 65 48 8b 05 63 f2 f1 11 48 3b 44 24 28 75 48 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 40 f4 45 0a cc 48 8d 3d 38 39 da
RSP: 0018:ffffc90003ca7818 EFLAGS: 00000286
RAX: ca0b9670ff60be00 RBX: 0000000000000206 RCX: 0000000000000046
RDX: ffffc900189db000 RSI: ffffffff8e703742 RDI: ffffffff8c6db080
RBP: ffff88807ecee9e8 R08: ffff88801ee15077 R09: 1ffff11003dc2a0e
R10: dffffc0000000000 R11: ffffed1003dc2a0f R12: 0000000000000003
R13: 0000000000000003 R14: ffffffff8ed5c9a0 R15: ffff88807eceddc0
rcu_lock_release include/linux/rcupdate.h:319 [inline]
rcu_read_unlock include/linux/rcupdate.h:880 [inline]
__update_page_owner_free_handle+0x466/0x4a0 mm/page_owner.c:313
__reset_page_owner+0x85/0x1f0 mm/page_owner.c:339
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1400 [inline]
__free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2944
__slab_free+0x274/0x2c0 mm/slub.c:5815
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4683 [inline]
slab_alloc_node mm/slub.c:4996 [inline]
kmem_cache_alloc_node_noprof+0x354/0x610 mm/slub.c:5068
__alloc_skb+0x1db/0x7a0 net/core/skbuff.c:704
alloc_skb include/linux/skbuff.h:1384 [inline]
alloc_uevent_skb+0x7d/0x230 lib/kobject_uevent.c:289
uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline]
kobject_uevent_net_broadcast+0x2fa/0x560 lib/kobject_uevent.c:410
kobject_uevent_env+0x566/0x9e0 lib/kobject_uevent.c:611
device_remove drivers/base/dd.c:616 [inline]
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x48b/0x880 drivers/base/dd.c:1372
driver_detach+0x1f3/0x2d0 drivers/base/dd.c:1435
bus_remove_driver+0x226/0x320 drivers/base/bus.c:832
usb_gadget_unregister_driver+0x4e/0x70 drivers/usb/gadget/udc/core.c:1784
raw_release+0xd7/0x260 drivers/usb/gadget/legacy/raw_gadget.c:463
__fput+0x418/0xa50 fs/file_table.c:513
fput_close_sync+0x11f/0x240 fs/file_table.c:618
__do_sys_close fs/open.c:1595 [inline]
__se_sys_close fs/open.c:1580 [inline]
__x64_sys_close+0x7e/0x110 fs/open.c:1580
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff9ee95e98e
RSP: 002b:00007ff9ef7c2f98 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007ff9ef7c36c0 RCX: 00007ff9ee95e98e
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007ff9eea35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff9eec26038 R14: 00007ff9eec25fa0 R15: 00007ffd35dd0448
task:syz-executor state:R running task stack:28168 pid:15854 tgid:15854 ppid:14985 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17dd/0x5940 kernel/sched/core.c:7270
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7592
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__sanitizer_cov_trace_pc+0x75/0x80 kernel/kcov.c:231
Code: 10 17 00 00 83 fa 02 75 21 48 8b 91 18 17 00 00 48 8b 32 48 8d 7e 01 8b 89 14 17 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 cc cc cc cc cc 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90
RSP: 0000:ffffc90003a177d8 EFLAGS: 00000293
RAX: ffffffff8be3e0a6 RBX: dffffc0000000000 RCX: ffff8880321f8000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000002
RBP: ffff8880239f8840 R08: ffff8880321f8000 R09: 0000000000000002
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000002
R13: ffff8880239f8840 R14: ffff8880239f9e42 R15: 0000000000000001
xas_descend lib/xarray.c:211 [inline]
xas_load+0x436/0x5a0 lib/xarray.c:246
xas_find+0x157/0x980 lib/xarray.c:1409
next_uptodate_folio+0x29/0x6e0 mm/filemap.c:3747
filemap_map_pages+0x28b/0x2170 mm/filemap.c:3922
do_fault_around mm/memory.c:5940 [inline]
do_read_fault mm/memory.c:5973 [inline]
do_fault mm/memory.c:6116 [inline]
do_pte_missing+0x20ae/0x34b0 mm/memory.c:4676
handle_pte_fault mm/memory.c:6540 [inline]
__handle_mm_fault mm/memory.c:6689 [inline]
handle_mm_fault+0x1a53/0x3750 mm/memory.c:6856
do_user_addr_fault+0xb35/0x1480 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7fabf324c180
RSP: 002b:00007ffe8f33eb08 EFLAGS: 00010202
RAX: 00007ffe8f33f120 RBX: 00007ffe8f33f040 RCX: 0000000000000000
RDX: 00007ffe8f33f100 RSI: 0000000000000025 RDI: 00007fabf3435ebb
RBP: 00007ffe8f33f21c R08: 00007ffe8f33f2b0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000017
R13: 0000000000000000 R14: 00007fabf3435ebb R15: 00007ffe8f33f100
rcu: rcu_preempt kthread starved for 10401 jiffies! g130857 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:27496 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17dd/0x5940 kernel/sched/core.c:7270
__schedule_loop kernel/sched/core.c:7347 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7362
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x1240 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9c/0x340 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 3226 Comm: kworker/R-bat_e Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: bat_events batadv_tt_purge
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:221
Code: f7 e8 0d cb ba f5 f7 c3 00 02 00 00 74 05 e8 60 14 e7 f5 9c 58 a9 00 02 00 00 75 29 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 74 e3 ab f5 65 48 8b 05 3c 48 ac 07 48 85 c0 74 18 5b 41 5e e9
RSP: 0018:ffffc90000007b28 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000246 RCX: 8000000000000102
RDX: 0000000000000002 RSI: ffffffff8e47ae18 RDI: 0000000000000001
RBP: ffffc90000007e40 R08: ffffffff907a5c7f R09: 1ffffffff20f4b8f
R10: dffffc0000000000 R11: fffffbfff20f4b90 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff888029ce4000 R15: ffff888029fd4410
FS: 0000000000000000(0000) GS:ffff888124ccb000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3eaa4e3368 CR3: 000000000eb48000 CR4: 00000000003526f0
Call Trace:
spin_unlock_irqrestore include/linux/spinlock.h:425 [inline]
dummy_timer+0x497b/0x4cf0 drivers/usb/gadget/udc/dummy_hcd.c:-1
__run_hrtimer kernel/time/hrtimer.c:2067 [inline]
__hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2124
hrtimer_run_softirq+0x1e3/0x2e0 kernel/time/hrtimer.c:2141
handle_softirqs+0x226/0x860 kernel/softirq.c:645
do_softirq+0x77/0xd0 kernel/softirq.c:546
__local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
spin_unlock_bh include/linux/spinlock.h:407 [inline]
batadv_tt_local_purge+0x2c1/0x340 net/batman-adv/translation-table.c:1402
batadv_tt_purge+0x35/0xa10 net/batman-adv/translation-table.c:3753
process_one_work kernel/workqueue.c:3399 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3482
rescuer_thread+0x7c5/0x10e0 kernel/workqueue.c:3706
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245