------------[ cut here ]------------
WARNING: CPU: 0 PID: 0 at kernel/rcu/tree_stall.h:826 rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:818
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.13.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:826
Code: 0f 88 fa 00 00 00 be 04 00 00 00 48 c7 c7 a0 a4 77 90 e8 5e 5d 58 00 b8 01 00 00 00 87 05 d3 76 17 0f 85 c0 0f 85 c9 00 00 00 <0f> 0b 48 81 fd c0 f3 f7 8b 48 c7 c3 4c 5d c9 8d 74 58 48 b8 00 00
RSP: 0018:ffffc90000007e30 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 000000010000be4a RCX: ffffffff81602dc2
RDX: fffffbfff20ef494 RSI: 0000000000000004 RDI: ffffffff9077a4a0
RBP: ffffffff8bf7f3c0 R08: 0000000000000001 R09: 0000000000000003
R10: fffffbfff20ef494 R11: 1ffff11005946c4e R12: 1ffffffff1781e30
R13: 0000000000000246 R14: ffff88802ca36192 R15: 000000000000000a
FS:  0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c015408aa0 CR3: 000000000bc8e000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_check_gp_start_stall kernel/rcu/tree_stall.h:789 [inline]
 rcu_core+0x4df/0x13b0 kernel/rcu/tree.c:2788
 __do_softirq+0x29b/0x9f6 kernel/softirq.c:559
 invoke_softirq kernel/softirq.c:433 [inline]
 __irq_exit_rcu+0x136/0x200 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647
RIP: 0010:default_idle+0xe/0x10 arch/x86/kernel/process.c:701
Code: ff ff ff 48 89 df e8 91 b0 9f f8 e9 52 ff ff ff 4c 89 e7 e8 84 b0 9f f8 eb 93 66 90 e9 07 00 00 00 0f 00 2d a4 2a 4d 00 fb f4 <c3> cc 41 55 41 54 55 48 89 fd 53 e8 b2 30 5b f8 e8 3d 59 fd ff 48
RSP: 0018:ffffffff8bc07e40 EFLAGS: 00000206
RAX: 000000000016cf7b RBX: ffffffff8bcbc540 RCX: ffffffff89162571
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000001 R09: ffff88802ca362cb
R10: ffffed1005946c59 R11: 0000000000000000 R12: fffffbfff17978a8
R13: 0000000000000000 R14: ffffffff8dc92a90 R15: 0000000000000000
 default_idle_call+0x87/0xd0 kernel/sched/idle.c:112
 cpuidle_idle_call kernel/sched/idle.c:194 [inline]
 do_idle+0x401/0x590 kernel/sched/idle.c:306
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403
 start_kernel+0x475/0x496 init/main.c:1087
 secondary_startup_64_no_verify+0xb0/0xbb