rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 ticks this GP) idle=493c/1/0x4000000000000000 softirq=19518/19519 fqs=1
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5917/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=12797, q=794 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5993 Comm: udevd Not tainted 6.16.0-rc4-syzkaller-00013-g66701750d556 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:io_serial_out+0x7c/0xc0 drivers/tty/serial/8250/8250_port.c:416
Code: ce 78 fc 44 89 f9 d3 e5 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 9c 51 dc fc 41 03 2e 89 d8 89 ea ee <5b> 41 5c 41 5e 41 5f 5d c3 cc cc cc cc cc 44 89 f9 80 e1 07 38 c1
RSP: 0018:ffffc90000006970 EFLAGS: 00000006
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: 0000000000000000 RDI: 0000000000000020
RBP: 00000000000003f9 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: ffffffff85477f60 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff99dc9760 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888125c50000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe8f5ec3e80 CR3: 000000000df38000 CR4: 00000000003526f0
Call Trace:
serial_out drivers/tty/serial/8250/8250.h:142 [inline]
serial8250_clear_IER drivers/tty/serial/8250/8250_port.c:-1 [inline]
serial8250_console_write+0x5ef/0x1ba0 drivers/tty/serial/8250/8250_port.c:3421
console_emit_next_record kernel/printk/printk.c:3138 [inline]
console_flush_all+0x725/0xc40 kernel/printk/printk.c:3226
__console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
console_unlock+0xc4/0x270 kernel/printk/printk.c:3325
vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450
_printk+0xcf/0x120 kernel/printk/printk.c:2475
print_task kernel/sched/debug.c:772 [inline]
print_rq kernel/sched/debug.c:807 [inline]
print_cpu+0xe2d/0x22f0 kernel/sched/debug.c:1000
sysrq_sched_debug_show+0x73/0x90 kernel/sched/debug.c:1084
show_state_filter+0x23a/0x2b0 kernel/sched/core.c:7802
kbd_keycode drivers/tty/vt/keyboard.c:1515 [inline]
kbd_event+0x2bdd/0x3ec0 drivers/tty/vt/keyboard.c:1534
input_handle_events_default+0xd1/0x1a0 drivers/input/input.c:2575
input_pass_values+0x288/0x890 drivers/input/input.c:127
input_event_dispose+0x330/0x6b0 drivers/input/input.c:341
input_event+0x8c/0xc0 drivers/input/input.c:395
input_sync include/linux/input.h:464 [inline]
hidinput_report_event+0xa1/0x100 drivers/hid/hid-input.c:1733
hid_report_raw_event+0x148b/0x16d0 drivers/hid/hid-core.c:2059
__hid_input_report drivers/hid/hid-core.c:2122 [inline]
hid_input_report+0x43e/0x520 drivers/hid/hid-core.c:2144
hid_irq_in+0x47e/0x6d0 drivers/hid/usbhid/hid-core.c:286
__usb_hcd_giveback_urb+0x417/0x690 drivers/usb/core/hcd.c:1650
dummy_timer+0x862/0x4550 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1825
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1842
handle_softirqs+0x286/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:kasan_mem_to_shadow include/linux/kasan.h:64 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:130 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x6b/0x2c0 mm/kasan/generic.c:189
Code: 00 ff f3 0f 1e fa 4c 39 cf 0f 82 58 02 00 00 49 89 ff 49 c1 ef 03 49 ba 00 00 00 00 00 fc ff df 4f 8d 1c 17 49 ff c8 4d 89 c1 <49> c1 e9 03 48 bb 01 00 00 00 00 fc ff df 4d 8d 34 19 4d 89 f4 4d
RSP: 0018:ffffc90003dff160 EFLAGS: 00000286
RAX: 1ffff920007bfe01 RBX: 0000000000000010 RCX: ffffffff817296e8
RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffffc90003dff2d8
RBP: 0000000000000000 R08: ffffc90003dff2e7 R09: ffffc90003dff2e7
R10: dffffc0000000000 R11: fffff520007bfe5b R12: ffffc90003dfff58
R13: ffffc90003dff2d8 R14: ffffc90003dff2d8 R15: 1ffff920007bfe5b
__asan_memset+0x22/0x50 mm/kasan/shadow.c:84
unwind_next_frame+0xc98/0x2390 arch/x86/kernel/unwind_orc.c:592
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
save_stack+0xf5/0x1f0 mm/page_owner.c:156
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:308
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1248 [inline]
free_unref_folios+0xc66/0x14d0 mm/page_alloc.c:2763
folios_put_refs+0x559/0x640 mm/swap.c:992
free_pages_and_swap_cache+0x277/0x520 mm/swap_state.c:264
__tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
tlb_flush_mmu+0x3a0/0x680 mm/mmu_gather.c:404
tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497
exit_mmap+0x44c/0xb50 mm/mmap.c:1297
__mmput+0x118/0x420 kernel/fork.c:1121
exit_mm+0x1da/0x2c0 kernel/exit.c:581
do_exit+0x648/0x22e0 kernel/exit.c:952
do_group_exit+0x21c/0x2d0 kernel/exit.c:1105
__do_sys_exit_group kernel/exit.c:1116 [inline]
__se_sys_exit_group kernel/exit.c:1114 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1114
x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe8f56f16c5
Code: Unable to access opcode bytes at 0x7fe8f56f169b.
RSP: 002b:00007fff9b5e8618 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000557c679a91c0 RCX: 00007fe8f56f16c5
RDX: 00000000000000e7 RSI: fffffffffffffe68 RDI: 0000000000000000
RBP: 0000557c67986910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff9b5e8660 R14: 0000000000000000 R15: 0000000000000000
task:kworker/u8:1 state:R
I
running task stack:24392 pid:5917 tgid:5917 ppid:2 task_flags:0x4208060 flags:0x00004000
kworker/R-tls-s 3167 11212.622935 E 11212.638749 1.400000 0.104541 2 100
Workqueue: ipv6_addrconf addrconf_dad_work
0.000000 0.000000 0.000000
0 0
Call Trace:
/
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
I
kworker/R-ipv6_ 3169 11215.043373 E 11215.059199 1.400000 0.099772 2 100
0.000000 0.000000 0.000000
0 0
/
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7108
I
kworker/R-krxrp 3382 11375.004811 E 11375.020962 1.400000 0.000000 2 100
0.000000 0.000000 0.000000
irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
0 0
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
/
RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5875
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 0b dd fe 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
I
RSP: 0018:ffffc9000523ef38 EFLAGS: 00000206
kworker/R-kkcmd 3386 11391.754552 E 11391.770408 1.400000 0.098860 2 100
0.000000 0.000000 0.000000
RAX: 8dd9b333a4f60c00 RBX: 0000000000000000 RCX: 8dd9b333a4f60c00
0 0
RDX: 0000000000000000 RSI: ffffffff8db6ee30 RDI: ffffffff8be28cc0
/
RBP: ffffffff81728af5 R08: 0000000000000000 R09: ffffffff81728af5
R10: ffffc9000523f0f8 R11: ffffffff81ace6d0 R12: 0000000000000002
I
R13: ffffffff8e13ee20 R14: 0000000000000000 R15: 0000000000000246
kworker/R-krdsd 3388 11452.685863 E 11452.701676 1.400000 0.115363 2 100
0.000000 0.000000 0.000000
0 0
/
R
kworker/u8:9 3517 59568.212123 E 59569.612123 1.400000 55162.793945 1434 120
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479
0.000000 0.000000 0.000000
0 0
/
I
kworker/R-zswap 5145 12516.243714 E 12516.259518 1.400000 0.121179 2 100
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
0.000000 0.000000 0.000000
0 0
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
/
I
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
kworker/R-kafs_ 5148 12807.948861 E 12807.964713 1.400000 0.093026 2 100
0.000000 0.000000 0.000000
0 0
/
R
jbd2/sda1-8 5162 59685.704746 E 59687.104746 1.400000 22.228596 54 120
0.000000 0.000000 0.000000
0 0
/
I
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
kworker/R-ext4- 5163 12869.218606 E 12869.234424 1.400000 0.089880 2 100
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x62/0x70 mm/kasan/common.c:264
0.000000 0.000000 0.000000
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2381 [inline]
slab_free mm/slub.c:4643 [inline]
kmem_cache_free+0x18f/0x400 mm/slub.c:4745
0 0
skb_release_data+0x62d/0x7c0 net/core/skbuff.c:1087
/
skb_release_all net/core/skbuff.c:1152 [inline]
__kfree_skb net/core/skbuff.c:1166 [inline]
consume_skb+0x9e/0xf0 net/core/skbuff.c:1398
I
netlink_broadcast_filtered+0x103c/0x1140 net/netlink/af_netlink.c:1524
kworker/1:2 5164 40442.253396 E 40443.653396 1.400000 101.275338 270 120
0.000000 0.000000 0.000000
nlmsg_multicast_filtered include/net/netlink.h:1151 [inline]
nlmsg_multicast include/net/netlink.h:1170 [inline]
nlmsg_notify+0xf0/0x1a0 net/netlink/af_netlink.c:2577
0 0
inet6_ifa_notify net/ipv6/addrconf.c:5625 [inline]
__ipv6_ifa_notify+0x236/0xac0 net/ipv6/addrconf.c:6273
/
R
syslogd 5183 59731.572129 E 59732.972129 1.400000 303.853793 2465 120
0.000000 0.000000 0.000000
0 0
/
R
acpid 5186 59244.448272 E 59245.848272 1.400000 46.315460 82 120
ipv6_ifa_notify net/ipv6/addrconf.c:6325 [inline]
addrconf_dad_completed+0x180/0xd60 net/ipv6/addrconf.c:4324
0.000000 0.000000 0.000000
0 0
/
addrconf_dad_work+0xc36/0x14b0 net/ipv6/addrconf.c:-1
S
klogd 5190 58919.342233 E 58920.742233 1.400000 354.462714 2237 120
0.000000 0.000000 0.000000
0 0
/
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
R
udevd 5201 59746.540159 E 59747.940159 1.400000 60399.156955 2532 120
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
0.000000 0.000000 0.000000
kthread+0x70e/0x8a0 kernel/kthread.c:464
0 0
/
S
dbus-daemon 5480 19656.351432 E 19656.410548 1.400000 4.015118 1 120
0.000000 0.000000 0.000000
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
0 0
/
S
dhcpcd 5495 58919.342233 E 58920.742233 1.400000 273.406272 942 120
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
0.000000 0.000000 0.000000
0 0
rcu: rcu_preempt kthread starved for 5224 jiffies! g12797 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
/
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
S
rcu: RCU grace-period kthread stack dump:
dhcpcd 5498 58919.342233 E 58920.742233 1.400000 13.225971 47 120
task:rcu_preempt state:R
0.000000 0.000000 0.000000
running task
0 0
stack:27320 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
/
Call Trace:
S
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
sshd 5591 29268.858644 E 29269.951490 1.400000 84.020313 31 120
0.000000 0.000000 0.000000
0 0
/
S
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
dhcpcd 5635 22797.255273 E 22798.510338 1.400000 8.506654 7 120
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
0.000000 0.000000 0.000000
0 0
/
S
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
dhcpcd 5642 22796.867741 E 22798.119235 1.400000 8.118258 4 120
0.000000 0.000000 0.000000
0 0
/
S
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
sshd-session 5866 58919.342233 E 58920.666984 1.400000 14.773170 9 120
0.000000 0.000000 0.000000
0 0
/
kthread+0x70e/0x8a0 kernel/kthread.c:464
R
syz-execprog 5868 59556.517497 E 59557.917497 1.400000 52.078392 1512 120
0.000000 0.000000 0.000000
0 0
/
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
R
syz-execprog 5869 59299.190987 E 59300.590987 1.400000 712.034952 663 120
0.000000 0.000000 0.000000
0 0
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
/
S
rcu: Stack dump where RCU GP kthread last ran:
syz-execprog 5870 30033.047890 E 30033.928758 1.400000 20.222324 85 120
CPU: 1 UID: 0 PID: 5956 Comm: kworker/u8:2 Not tainted 6.16.0-rc4-syzkaller-00013-g66701750d556 #0 PREEMPT(full)
0.000000 0.000000 0.000000
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
0 0
Workqueue: events_unbound toggle_allocation_gate
/
RIP: 0010:check_kcov_mode kernel/kcov.c:185 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x31/0x70 kernel/kcov.c:217
S
Code: 24 65 48 8b 0c 25 08 00 9d 92 65 8b 15 78 b1 dc 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00 00 74 2c <8b> 91 18 16 00 00 83 fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 48
syz-execprog 5871 30033.201097 E 30034.550941 1.400000 495.689909 198 120
RSP: 0018:ffffc9000408f698 EFLAGS: 00000246
0.000000 0.000000 0.000000
0 0
RAX: ffffffff81b4d950 RBX: ffff8880b873b1c0 RCX: ffff8880348ebc00
/
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000408f800 R08: ffffffff8fa104f7 R09: 1ffffffff1f4209e
R10: dffffc0000000000 R11: fffffbfff1f4209f R12: 1ffff110170c8385
S
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b8641c28
syz-execprog 5873 58918.656508 E 58919.946203 1.400000 191.400039 172 120
FS: 0000000000000000(0000) GS:ffff888125d50000(0000) knlGS:0000000000000000
0.000000 0.000000 0.000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
0 0
CR2: 00007fab200a27b8 CR3: 000000000df38000 CR4: 00000000003526f0
/
Call Trace:
R
syz-executor 5876 59731.686374 E 59733.086374 1.400000 4748.965365 218 120
csd_lock_wait kernel/smp.c:340 [inline]
smp_call_function_many_cond+0xf80/0x12d0 kernel/smp.c:885
0.000000 0.000000 0.000000
0 0
/
R
udevd 5883 59368.403506 E 59369.803506 1.400000 193.554500 130 120
0.000000 0.000000 0.000000
0 0
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
/
on_each_cpu include/linux/smp.h:71 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2691 [inline]
smp_text_poke_batch_finish+0x5e0/0x1100 arch/x86/kernel/alternative.c:2901
I
kworker/u8:0 5908 58919.342233 E 58920.702574 1.400000 381.414433 686 120
0.000000 0.000000 0.000000
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
0 0
static_key_enable_cpuslocked+0x128/0x250 kernel/jump_label.c:210
/
static_key_enable+0x1a/0x20 kernel/jump_label.c:223
R
toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:850
kworker/u8:1 5917 59726.054260 E 59727.454260 1.400000 116.146838 155 120
0.000000 0.000000 0.000000
0 0
/
R
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
udevd 5922 59368.400047 E 59369.800047 1.400000 443.583140 351 120
0.000000 0.000000 0.000000
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
0 0
/
kthread+0x70e/0x8a0 kernel/kthread.c:464
I
kworker/1:3 5949 58904.548972 E 58905.948972 1.400000 5.487483 42 120
0.000000 0.000000 0.000000
0 0
/
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
>R
kworker/u8:2 5956 110545.760151 N 110547.160151 1.400000 52007.187530 724 120
0.000000 0.000000 0.000000
0 0
/
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
R udevd 5986 59728.265771 E 59729.665771 1.400000 11.046962 6 120 0.000000 0.000000 0.000000 0 0 /
R kworker/1:4 5987 59722.734401 E 59724.134401 1.400000 0.609142 232 120 0.000000 0.000000 0.000000 0 0 /
R udevd 5994 59730.798692 E 59732.198692 1.400000 17.352938 13 120 0.000000 0.000000 0.000000 0 0 /
R syz-executor 5995 0.638759 E 0.761241 1.400000 246.382386 374 120 0.000000 0.000000 0.000000 0 0 /syz2
S krxrpcio/7001 5996 58917.882305 E 58917.898456 1.400000 0.000000 2 100 0.000000 0.000000 0.000000 0 0 /
S napi/wg0-0 6028 58917.882305 E 58919.282305 1.400000 0.047109 3 120 0.000000 0.000000 0.000000 0 0 /
S napi/wg1-0 6030 58919.260772 E 58920.660772 1.400000 0.032427 4 120 0.000000 0.000000 0.000000 0 0 /
S napi/wg2-0 6032 58919.260772 E 58920.660772 1.400000 0.046774 4 120 0.000000 0.000000 0.000000 0 0 /
Z syz.2.17 6058 0.636093 N 0.351424 1.400000 6.923318 14 120 0.000000 0.000000 0.000000 0 0 /syz2
R syz.2.17 6059 0.638759 E 0.761241 1.400000 3.437675 25 120 0.000000 0.000000 0.000000 0 0 /syz2
R dhcpcd-run-hook 6087 63156.069123 N 63157.469123 1.400000 4249.058233 18 120 0.000000 0.000000 0.000000 0 0 /
Showing all locks held in the system:
2 locks held by getty/5592:
#0: ffff88803087c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fee2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
4 locks held by kworker/u8:1/5917:
5 locks held by kworker/u8:2/5956:
4 locks held by kworker/0:4/5983:
3 locks held by kworker/1:4/5987:
6 locks held by udevd/5993:
#0: ffff88807cc357e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:356 [inline]
#0: ffff88807cc357e0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28e/0xb50 mm/mmap.c:1292
#1: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
#1: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa5/0x2390 arch/x86/kernel/unwind_orc.c:479
#2: ffff8880681a4230 (&dev->event_lock#2){..-.}-{3:3}, at: class_spinlock_irqsave_constructor include/linux/spinlock.h:585 [inline]
#2: ffff8880681a4230 (&dev->event_lock#2){..-.}-{3:3}, at: input_event+0x7a/0xc0 drivers/input/input.c:394
#3: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#3: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#3: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
#3: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: input_pass_values+0x8d/0x890 drivers/input/input.c:118
#4: ffffffff8e9a5f58 (kbd_event_lock){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
#4: ffffffff8e9a5f58 (kbd_event_lock){..-.}-{3:3}, at: kbd_event+0xd2/0x3ec0 drivers/tty/vt/keyboard.c:1528
#5: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#5: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#5: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
2 locks held by dhcpcd-run-hook/6087:
=============================================
task:init state:S stack:18808 pid:1 tgid:1 ppid:0 task_flags:0x400100 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
schedule_hrtimeout_range_clock+0x1c5/0x2f0 kernel/time/sleep_timeout.c:207
do_sigtimedwait+0x386/0x680 kernel/signal.c:3782
__do_sys_rt_sigtimedwait kernel/signal.c:3826 [inline]
__se_sys_rt_sigtimedwait+0x1cd/0x2b0 kernel/signal.c:3804
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff734ef9407
RSP: 002b:00007fffe0323230 EFLAGS: 00000202 ORIG_RAX: 0000000000000080
RAX: ffffffffffffffda RBX: 00007ff734da9c80 RCX: 00007ff734ef9407
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ff735113498
RBP: 00007ff735113490 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000202 R12: 00007ff735113490
R13: 00007fffe03232ac R14: 00007ff735153000 R15: 000055ccc6a55d98
task:kthreadd state:S stack:26304 pid:2 tgid:2 ppid:0 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
kthreadd+0x3e3/0x770 kernel/kthread.c:835
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
task:pool_workqueue_ state:S stack:26648 pid:3 tgid:3 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
kthread_worker_fn+0x4c2/0xb60 kernel/kthread.c:1017
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148