------------[ cut here ]------------
WARNING: CPU: 0 PID: 0 at kernel/rcu/tree_stall.h:824 rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:816
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:824
Code: 0f 88 fa 00 00 00 be 04 00 00 00 48 c7 c7 e0 33 e3 8f e8 1e cd 56 00 b8 01 00 00 00 87 05 33 46 83 0e 85 c0 0f 85 c9 00 00 00 <0f> 0b 48 81 fd 80 c9 f7 8b 48 c7 c3 8c c7 c5 8d 74 58 48 b8 00 00
RSP: 0018:ffffc90000007e68 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000100010a14 RCX: ffffffff815feda2
RDX: fffffbfff1fc667c RSI: 0000000000000004 RDI: ffffffff8fe333e0
RBP: ffffffff8bf7c980 R08: 0000000000000001 R09: 0000000000000003
R10: fffffbfff1fc667c R11: ffffffff8bf7c9c0 R12: 1ffffffff1781e30
R13: 0000000000000246 R14: ffff8880b9c35fd2 R15: ffff8880b9c36058
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a6318a44d0 CR3: 00000000126e0000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 rcu_check_gp_start_stall kernel/rcu/tree_stall.h:787 [inline]
 rcu_core+0x4d6/0x1280 kernel/rcu/tree.c:2789
 __do_softirq+0x29b/0x9f6 kernel/softirq.c:343
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:226 [inline]
 __irq_exit_rcu kernel/softirq.c:420 [inline]
 irq_exit_rcu+0x134/0x200 kernel/softirq.c:432
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:137 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline]
RIP: 0010:acpi_idle_do_entry+0x1c9/0x250 drivers/acpi/processor_idle.c:516
Code: 5d a0 6f f8 84 db 75 ac e8 d4 99 6f f8 e8 7f 6b 75 f8 e9 0c 00 00 00 e8 c5 99 6f f8 0f 00 2d ee 5d c6 00 e8 b9 99 6f f8 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 94 a1 6f f8 48 85 db
RSP: 0018:ffffffff8bc07d60 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffffffff8bcbc340 RSI: ffffffff8903d617 RDI: 0000000000000000
RBP: ffff888014f3e864 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817941b8 R11: 0000000000000000 R12: 0000000000000001
R13: ffff888014f3e800 R14: ffff888014f3e864 R15: ffff8881432f2004
 acpi_idle_enter+0x361/0x500 drivers/acpi/processor_idle.c:647
 cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237
 cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351
 call_cpuidle kernel/sched/idle.c:158 [inline]
 cpuidle_idle_call kernel/sched/idle.c:239 [inline]
 do_idle+0x3e1/0x590 kernel/sched/idle.c:300
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:397
 start_kernel+0x46b/0x48c init/main.c:1061
 secondary_startup_64_no_verify+0xb0/0xbb