rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
1-....
} 3865 jiffies s: 39073 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 29602 Comm: udevd Not tainted 6.10.0-rc4-syzkaller-00025-gb0fc24f36191 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:write_comp_data+0x11/0x90 kernel/kcov.c:236
Code: cc cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 49 89 d2 49 89 f8 49 89 f1 65 48 8b 15 bf 88 b0 7e <65> 8b 05 c0 88 b0 7e a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b 82 54
RSP: 0018:ffffc900001b7fe0 EFLAGS: 00000006
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff868b6bf0
RDX: ffff8881073aba00 RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffffffff8797ac80 R08: 0000000000000001 R09: 0000000000000002
R10: 000000000000000f R11: 0000000000974dc8 R12: 000000000000000f
R13: 0000000000000001 R14: 0000000000000008 R15: 000000000000000f
FS: 00007f3c370dac80(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3652f3b070 CR3: 000000011de6c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__sanitizer_cov_trace_switch+0x54/0x90 kernel/kcov.c:341
vsnprintf+0x160/0x1880 lib/vsprintf.c:2780
snprintf+0xc8/0x100 lib/vsprintf.c:2959
print_caller kernel/printk/printk.c:1336 [inline]
info_print_prefix+0x135/0x350 kernel/printk/printk.c:1355
record_print_text+0x141/0x400 kernel/printk/printk.c:1402
printk_get_next_message+0x2a6/0x670 kernel/printk/printk.c:2855
console_emit_next_record kernel/printk/printk.c:2895 [inline]
console_flush_all+0x3b2/0xd70 kernel/printk/printk.c:2994
console_unlock+0xae/0x290 kernel/printk/printk.c:3063
vprintk_emit kernel/printk/printk.c:2345 [inline]
vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2300
vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
_printk+0xc8/0x100 kernel/printk/printk.c:2370
printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
show_trace_log_lvl+0x211/0x500 arch/x86/kernel/dumpstack.c:285
sched_show_task kernel/sched/core.c:9191 [inline]
sched_show_task+0x42e/0x650 kernel/sched/core.c:9165
show_state_filter+0xee/0x320 kernel/sched/core.c:9236
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:1524 [inline]
kbd_event+0xcbd/0x17a0 drivers/tty/vt/keyboard.c:1543
input_to_handler+0x38f/0x4d0 drivers/input/input.c:132
input_pass_values+0x5c9/0x840 drivers/input/input.c:161
input_event_dispose+0x37a/0x630 drivers/input/input.c:378
input_handle_event+0x11c/0xd80 drivers/input/input.c:406
input_repeat_key+0x251/0x340 drivers/input/input.c:2337
call_timer_fn+0x1a0/0x610 kernel/time/timer.c:1792
expire_timers kernel/time/timer.c:1843 [inline]
__run_timers+0x74b/0xaf0 kernel/time/timer.c:2417
__run_timer_base kernel/time/timer.c:2428 [inline]
__run_timer_base kernel/time/timer.c:2421 [inline]
run_timer_base+0x111/0x190 kernel/time/timer.c:2437
run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2447
handle_softirqs+0x209/0x8e0 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu kernel/softirq.c:637 [inline]
irq_exit_rcu+0xac/0x110 kernel/softirq.c:649
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1043
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x1f2/0x560 kernel/locking/lockdep.c:5722
Code: c1 05 ca 11 d1 7e 83 f8 01 0f 85 ea 02 00 00 9c 58 f6 c4 02 0f 85 d5 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc90001d5f918 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff920003abf25 RCX: ffffffff8130811e
RDX: 0000000000000001 RSI: ffffffff86c7d9e0 RDI: ffffffff86e77840
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff1997d9e
R10: ffffffff8ccbecf7 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000000 R14: ffff888110780228 R15: 0000000000000000
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
__d_lookup+0x18d/0x4c0 fs/dcache.c:2312
lookup_fast+0x17b/0x540 fs/namei.c:1650
walk_component+0x5b/0x5b0 fs/namei.c:2000
link_path_walk.part.0.constprop.0+0x77f/0xcd0 fs/namei.c:2331
link_path_walk fs/namei.c:2255 [inline]
path_lookupat+0x93/0x770 fs/namei.c:2492
filename_lookup+0x1e5/0x5b0 fs/namei.c:2522
user_path_at_empty+0x42/0x60 fs/namei.c:2929
do_readlinkat+0xdd/0x310 fs/stat.c:499
__do_sys_readlink fs/stat.c:532 [inline]
__se_sys_readlink fs/stat.c:529 [inline]
__x64_sys_readlink+0x78/0xc0 fs/stat.c:529
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: 0033:0x7f3c37206d47
Code: 73 01 c3 48 8b 0d e1 90 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b1 90 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007ffcf5857d98 EFLAGS: 00000206 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00000000000000ff RCX: 00007f3c37206d47
RDX: 0000000000000400 RSI: 00007ffcf58581a8 RDI: 00007ffcf5857da8
RBP: 00007ffcf58585e8 R08: 0000564524ddd1fd R09: 0000000000000000
R10: 0000000000000010 R11: 0000000000000206 R12: 0000000000000200
R13: 00007ffcf58581a8 R14: 00007ffcf5857da8 R15: 00007ffcf5858ca9
__schedule_loop kernel/sched/core.c:6822 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6837
kthreadd+0x5ba/0x7d0 kernel/kthread.c:753
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147