------------[ cut here ]------------
WARNING: CPU: 0 PID: 0 at kernel/rcu/tree_stall.h:770 rcu_check_gp_start_stall.part.0+0x1b2/0x2b0 kernel/rcu/tree_stall.h:762
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.11.0-rc6-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+0x1b2/0x2b0 kernel/rcu/tree_stall.h:770
Code: d8 09 48 01 c3 48 39 da 78 5d be 04 00 00 00 48 c7 c7 a0 53 1f 8f e8 4d 27 56 00 b8 01 00 00 00 87 05 a2 f6 bf 0d 85 c0 75 34 <0f> 0b 48 81 fd 40 c0 37 8b 74 0c 48 c7 c7 40 c0 37 8b e8 07 e7 9c
RSP: 0018:ffffc90000007e70 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000100009ea7 RCX: ffffffff815f5cf3
RDX: fffffbfff1e3ea74 RSI: 0000000000000004 RDI: ffffffff8f1f53a0
RBP: ffffffff8b37c040 R08: 0000000000000001 R09: 0000000000000003
R10: fffffbfff1e3ea74 R11: ffffffff8b37c088 R12: 1ffffffff1601e30
R13: 0000000000000246 R14: ffff8880b9e35a92 R15: ffff8880b9e35b18
FS:  0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c010eff000 CR3: 0000000017bc7000 CR4: 0000000000350ef0
DR0: 0080ffff00000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_check_gp_start_stall kernel/rcu/tree_stall.h:733 [inline]
 rcu_core+0x3b1/0xf00 kernel/rcu/tree.c:2718
 __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:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629
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:79 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:169 [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: cd 83 76 f8 84 db 75 ac e8 44 7d 76 f8 e8 bf 4f 7c f8 e9 0c 00 00 00 e8 35 7d 76 f8 0f 00 2d 3e a2 ad 00 e8 29 7d 76 f8 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 04 85 76 f8 48 85 db
RSP: 0018:ffffffff8b007d60 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffffffff8b0bc340 RSI: ffffffff88fc3e47 RDI: 0000000000000000
RBP: ffff88814149e864 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff81788e28 R11: 0000000000000000 R12: 0000000000000001
R13: ffff88814149e800 R14: ffff88814149e864 R15: ffff8881437c6804
 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:299
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:396
 start_kernel+0x46b/0x48c init/main.c:1061
 secondary_startup_64_no_verify+0xb0/0xbb