rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6776
rcu: (detected by 1, t=10503 jiffies, g=23793, q=3580 ncpus=2)
task:udevd state:R running task stack:25032 pid:6776 ppid:5156 flags:0x0000400a
Call Trace:
sched_show_task+0x481/0x5a0 kernel/sched/core.c:9178
rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:261 [inline]
print_other_cpu_stall+0xfa7/0x1340 kernel/rcu/tree_stall.h:637
check_cpu_stall kernel/rcu/tree_stall.h:809 [inline]
rcu_pending kernel/rcu/tree.c:3950 [inline]
rcu_sched_clock_irq+0x87c/0x1220 kernel/rcu/tree.c:2295
update_process_times+0x147/0x1b0 kernel/time/timer.c:2071
tick_sched_handle kernel/time/tick-sched.c:254 [inline]
tick_sched_timer+0x3a2/0x580 kernel/time/tick-sched.c:1492
__run_hrtimer kernel/time/hrtimer.c:1755 [inline]
__hrtimer_run_queues+0x4df/0xc40 kernel/time/hrtimer.c:1819
hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1881
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:check_preemption_disabled+0x18/0x110 lib/smp_processor_id.c:14
Code: 20 66 fc 8a eb 0c 66 2e 0f 1f 84 00 00 00 00 00 66 90 55 41 57 41 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 <65> 8b 05 8d 5c 96 75 65 8b 0d 82 5c 96 75 f7 c1 ff ff ff 7f 74 1f
RSP: 0018:ffffc900001f0618 EFLAGS: 00000286
RAX: e675f0c1b7ea9900 RBX: 0000000000000000 RCX: ffff88802a02da00
RDX: ffff88802a02da00 RSI: ffffffff8afc6620 RDI: ffffffff8afc65e0
RBP: ffffc900001f0778 R08: ffffc900001f070f R09: 0000000000000000
R10: ffffc900001f0700 R11: fffff5200003e0e2 R12: ffffffff8cbfae10
R13: 1ffff9200003e0dc R14: ffff88802c13c200 R15: ffffc900001f0700
rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:700
rcu_read_lock_held_common kernel/rcu/update.c:108 [inline]
rcu_read_lock_held+0x15/0x40 kernel/rcu/update.c:348
bpf_prog_run_array include/linux/bpf.h:1961 [inline]
trace_call_bpf+0x1f1/0x690 kernel/trace/bpf_trace.c:143
perf_trace_run_bpf_submit+0x7a/0x1c0 kernel/events/core.c:10262
perf_trace_lock_acquire+0x32a/0x3e0 include/trace/events/lock.h:24
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0x3e2/0x410 kernel/locking/lockdep.c:5725
rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
rcu_read_lock include/linux/rcupdate.h:786 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2321 [inline]
bpf_trace_run1+0xf7/0x3b0 kernel/trace/bpf_trace.c:2360
__bpf_trace_rcu_utilization+0xa2/0xe0 include/trace/events/rcu.h:27
__traceiter_rcu_utilization+0x70/0xa0 include/trace/events/rcu.h:27
trace_rcu_utilization+0x179/0x1a0 include/trace/events/rcu.h:27
rcu_core+0x12d/0x1720 kernel/rcu/tree.c:2439
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
sysvec_irq_work+0xa1/0xc0 arch/x86/kernel/irq_work.c:17
asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723
RIP: 0010:rcu_read_unlock_special+0x88/0x4c0 kernel/rcu/tree_plugin.h:682
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 89 57 93 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc90003607ca0 EFLAGS: 00000206
RAX: e675f0c1b7ea9900 RBX: 1ffff920006c0f9c RCX: e675f0c1b7ea9900
RDX: dffffc0000000000 RSI: ffffffff8aaab9a0 RDI: ffffffff8afc6640
RBP: ffffc90003607d90 R08: ffffffff90da3517 R09: 1ffffffff21b46a2
R10: dffffc0000000000 R11: fffffbfff21b46a3 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8cd354d8
__rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock+0x85/0xa0 include/linux/rcupdate.h:818
dput+0xe6/0x1e0 fs/dcache.c:911
do_unlinkat+0x33a/0x570 fs/namei.c:4394
__do_sys_unlink fs/namei.c:4439 [inline]
__se_sys_unlink fs/namei.c:4437 [inline]
__x64_sys_unlink+0x49/0x50 fs/namei.c:4437
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9ed2b15937
Code: 00 00 e9 a9 fd ff ff 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 5f 00 00 00 0f 05 c3 0f 1f 84 00 00 00 00 00 b8 57 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 91 b4 0d 00 f7 d8 64 89 02 b8
RSP: 002b:00007ffe08cc38f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 000055e8fd7f7320 RCX: 00007f9ed2b15937
RDX: 0000000000000000 RSI: 00007ffe08cc28b0 RDI: 00007ffe08cc3900
RBP: 00000000000001bb R08: 0000000000000064 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe08cc3900
R13: 000055e8fd7f5410 R14: 0000000000000008 R15: 000055e8fd7f7320
rcu: rcu_preempt kthread starved for 10094 jiffies! g23793 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:27088 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
schedule+0xbd/0x170 kernel/sched/core.c:6773
schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8145 Comm: dhcpcd-run-hook Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__lock_acquire+0x680d/0x7c80 kernel/locking/lockdep.c:5038
Code: 07 80 c1 03 38 c1 0f 8c c6 99 ff ff 48 89 df e8 59 66 75 00 49 b8 00 00 00 00 00 fc ff df e9 af 99 ff ff 48 c7 c1 60 a4 ea 96 <80> e1 07 80 c1 03 38 c1 0f 8c b9 99 ff ff 48 c7 c7 60 a4 ea 96 e8
RSP: 0018:ffffc900000075e0 EFLAGS: 00000002
RAX: 0000000000000004 RBX: ffff8880256fc6d8 RCX: ffffffff96eaa460
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8cd2fba0
RBP: ffffc90000007828 R08: dffffc0000000000 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff1c950fe R12: 0000000000000000
R13: ffffffff9070ce90 R14: ffffffff8cd2fba8 R15: 0000000000000000
FS: 00007fda10410c80(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005621a8b5c138 CR3: 000000002d9a5000 CR4: 00000000003506f0
Call Trace:
lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
rcu_read_lock include/linux/rcupdate.h:786 [inline]
trace_call_bpf+0xe4/0x690 kernel/trace/bpf_trace.c:142
perf_trace_run_bpf_submit+0x7a/0x1c0 kernel/events/core.c:10262
perf_trace_lock_acquire+0x32a/0x3e0 include/trace/events/lock.h:24
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0x3e2/0x410 kernel/locking/lockdep.c:5725
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:522 [inline]
try_to_wake_up+0x60/0x1140 kernel/sched/core.c:4232
wakeup_softirqd kernel/softirq.c:80 [inline]
handle_softirqs+0x5fe/0x820 kernel/softirq.c:601
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
sysvec_irq_work+0xa1/0xc0 arch/x86/kernel/irq_work.c:17
asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723
RIP: 0010:rcu_read_unlock_special+0x88/0x4c0 kernel/rcu/tree_plugin.h:682
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 89 57 93 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc9000bf47ce0 EFLAGS: 00000206
RAX: c3934753e9f17a00 RBX: 1ffff920017e8fa4 RCX: c3934753e9f17a00
RDX: dffffc0000000000 RSI: ffffffff8aaab9a0 RDI: ffffffff8afc6640
RBP: ffffc9000bf47dd8 R08: ffffffff90da3517 R09: 1ffffffff21b46a2
R10: dffffc0000000000 R11: fffffbfff21b46a3 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8cd354d8
__rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock+0x85/0xa0 include/linux/rcupdate.h:818
dput+0xe6/0x1e0 fs/dcache.c:911
__fput+0x5e5/0x970 fs/file_table.c:392
__do_sys_close fs/open.c:1571 [inline]
__se_sys_close+0x15f/0x220 fs/open.c:1556
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fda10560407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffc596b1c20 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007fda10410c80 RCX: 00007fda10560407
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000b
RBP: 00005621a8b4f018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000