rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (2 ticks this GP) idle=18cc/1/0x4000000000000000 softirq=14021/14021 fqs=0
rcu: 	(detected by 0, t=10506 jiffies, g=8557, q=649 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5529 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:hlock_class kernel/locking/lockdep.c:234 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4854 [inline]
RIP: 0010:__lock_acquire+0x332/0xd20 kernel/locking/lockdep.c:5187
Code: e5 15 09 d5 09 cd 44 09 f5 41 89 6c c7 20 45 89 44 c7 24 4c 89 7c 24 10 4d 8d 34 c7 81 e5 ff 1f 00 00 48 0f a3 2d 3e 1f 0b 12 <73> 10 48 69 c5 c8 00 00 00 48 8d 80 10 83 49 93 eb 40 83 3d a5 ae
RSP: 0018:ffffc90000a08b30 EFLAGS: 00000007
RAX: 000000000000000f RBX: ffff88807c6f8300 RCX: 000000000000080a
RDX: 0000000000080000 RSI: 0000000000004000 RDI: ffff88802de53c00
RBP: 000000000000080a R08: 0000000000000000 R09: ffffffff899b1774
R10: dffffc0000000000 R11: ffffffff899b16b0 R12: 0000000000004000
R13: 0000000000000000 R14: ffff88802de54768 R15: ffff88802de546f0
FS:  00007f60611f2740(0000) GS:ffff888125d14000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc98eb90e0 CR3: 00000000318a8000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
 __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]
 advance_sched+0xc4/0xc90 net/sched/sch_taprio.c:929
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x529/0xc60 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_is_held_type+0x137/0x190 kernel/locking/lockdep.c:5945
Code: 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 f9 43 26 07 <48> 3b 44 24 08 75 43 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc9000390f278 EFLAGS: 00000206
RAX: 55ae3487fb7d6600 RBX: 0000000000000000 RCX: 55ae3487fb7d6600
RDX: 0000000000000000 RSI: ffffffff8dba9235 RDI: ffffffff8be33880
RBP: 00000000ffffffff R08: 0000000000000000 R09: ffffffff8215cd7d
R10: ffffc9000390f4a0 R11: fffff52000721e99 R12: 0000000000000246
R13: ffff88802de53c00 R14: ffffffff8e139f80 R15: 0000000000000003
 lock_is_held include/linux/lockdep.h:249 [inline]
 __might_resched+0xa6/0x610 kernel/sched/core.c:8919
 might_alloc include/linux/sched/mm.h:321 [inline]
 prepare_alloc_pages+0x1d9/0x610 mm/page_alloc.c:4916
 __alloc_frozen_pages_noprof+0x123/0x370 mm/page_alloc.c:5137
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
 alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2507
 pagetable_alloc_noprof include/linux/mm.h:2881 [inline]
 __pud_alloc_one_noprof include/asm-generic/pgalloc.h:177 [inline]
 pud_alloc_one_noprof include/asm-generic/pgalloc.h:198 [inline]
 __pud_alloc+0x3a/0x260 mm/memory.c:6426
 pud_alloc include/linux/mm.h:2838 [inline]
 copy_pud_range mm/memory.c:1278 [inline]
 copy_p4d_range mm/memory.c:1322 [inline]
 copy_page_range+0xcb0/0x1270 mm/memory.c:1410
 dup_mmap+0xf57/0x1ac0 mm/mmap.c:1834
 dup_mm kernel/fork.c:1485 [inline]
 copy_mm+0x13c/0x4b0 kernel/fork.c:1537
 copy_process+0x1706/0x3c00 kernel/fork.c:2175
 kernel_clone+0x21e/0x840 kernel/fork.c:2605
 __do_sys_clone kernel/fork.c:2748 [inline]
 __se_sys_clone kernel/fork.c:2732 [inline]
 __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2732
 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: 0033:0x7f60612c6636
Code: 89 df e8 6d e8 f6 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 52 89 c5 85 c0 75 31 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffc98e987f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffc98e987f8 RCX: 00007f60612c6636
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffc98eb8d40 R08: 0000000000000000 R09: 0000000000000001
R10: 00007f60611f2a10 R11: 0000000000000246 R12: 00007ffc98e98930
R13: 0000000000000000 R14: 0000000000000000 R15: 0000564263000ac0
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.498 msecs
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g8557 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=4519
rcu: rcu_preempt kthread starved for 10506 jiffies! g8557 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
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:I stack:27432 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7058
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 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>