rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (3 ticks this GP) idle=3964/1/0x4000000000000000 softirq=22059/22059 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=16353, q=932 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6535 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:222 [inline]
RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:233 [inline]
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:646 [inline]
RIP: 0010:cpu_online include/linux/cpumask.h:1205 [inline]
RIP: 0010:trace_hrtimer_start include/trace/events/timer.h:222 [inline]
RIP: 0010:debug_activate kernel/time/hrtimer.c:478 [inline]
RIP: 0010:enqueue_hrtimer+0x81/0x3a0 kernel/time/hrtimer.c:1081
Code: 00 00 e8 02 2e 12 00 45 89 fd 41 c1 ef 06 4a 8d 3c fd 70 13 9e 8f be 08 00 00 00 e8 79 e0 77 00 31 f6 4c 0f a3 2d 5f fd ef 0d <40> 0f 92 c5 40 0f 92 c6 bf 02 00 00 00 e8 cd 30 12 00 40 84 ed 74
RSP: 0018:ffffc90000a08d08 EFLAGS: 00000047
RAX: ffffffff81ae1501 RBX: ffff888029114340 RCX: ffffffff81ae1607
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8f9e1370
RBP: 0000000000000000 R08: ffffffff8f9e1377 R09: 1ffffffff1f3c26e
R10: dffffc0000000000 R11: fffffbfff1f3c26f R12: dffffc0000000000
R13: 0000000000000001 R14: ffff8880b8727bc0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125e0c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcfe0d12f8 CR3: 000000000df38000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1794 [inline]
 __hrtimer_run_queues+0x656/0xc60 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:zap_pmd_range mm/memory.c:1923 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1975 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1996 [inline]
RIP: 0010:unmap_page_range+0x88b/0x4370 mm/memory.c:2017
Code: ff 49 81 c6 00 00 20 00 4c 39 eb 4d 0f 43 f4 4c 89 74 24 48 4c 89 fb 49 c1 ef 03 48 b8 00 00 00 00 00 fc ff df 41 80 3c 07 00 <74> 08 48 89 df e8 1b af 1a 00 48 89 9c 24 b0 00 00 00 4c 8b 23 4c
RSP: 0018:ffffc90003f9f5e0 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff88805ca29a30 RCX: ffff88802a171e40
RDX: 0000000000000000 RSI: 00007f6ae8dc7fff RDI: 00007f6ae8dfffff
RBP: ffffc90003f9f890 R08: ffffc90003f9f970 R09: 0000000000000002
R10: 0000000000000406 R11: 0000000000000000 R12: 00007f6ae8dc8000
R13: 00007f6ae8dc7fff R14: 00007f6ae8dc8000 R15: 1ffff1100b945346
 unmap_single_vma mm/memory.c:2060 [inline]
 unmap_vmas+0x399/0x580 mm/memory.c:2104
 exit_mmap+0x240/0xb40 mm/mmap.c:1280
 __mmput+0x118/0x430 kernel/fork.c:1133
 exit_mm+0x1da/0x2c0 kernel/exit.c:582
 do_exit+0x648/0x2300 kernel/exit.c:954
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1107
 __do_sys_exit_group kernel/exit.c:1118 [inline]
 __se_sys_exit_group kernel/exit.c:1116 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1116
 x64_sys_call+0x21f7/0x2200 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6ae8eff6c5
Code: Unable to access opcode bytes at 0x7f6ae8eff69b.
RSP: 002b:00007ffcfe0d1208 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007ffcfe0d1504 RCX: 00007f6ae8eff6c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000000
RBP: 0000000000000003 R08: 00007ffcfe0d1300 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffcfe0d1540 R14: 00007f6ae910f000 R15: 0000557dd5b41d98
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g16353 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=7660
rcu: rcu_preempt kthread starved for 10502 jiffies! g16353 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:26856 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7026
 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+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>