------------[ cut here ]------------
WARNING: CPU: 1 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: 1 PID: 0 Comm: swapper/1 Not tainted 5.13.0-rc3-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 64 77 90 e8 1e df 58 00 b8 01 00 00 00 87 05 03 66 16 0f 85 c0 0f 85 c9 00 00 00 <0f> 0b 48 81 fd 00 1f f8 8b 48 c7 c3 2c 97 c9 8d 74 58 48 b8 00 00
RSP: 0018:ffffc900004f8e30 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000100003d41 RCX: ffffffff8160fe92
RDX: fffffbfff20eec94 RSI: 0000000000000004 RDI: ffffffff907764a0
RBP: ffffffff8bf81f00 R08: 0000000000000001 R09: 0000000000000003
R10: fffffbfff20eec94 R11: 1ffff11005966c2e R12: 1ffffffff1781e30
R13: 0000000000000246 R14: ffff88802cb36092 R15: 000000000000000a
FS:  0000000000000000(0000) GS:ffff88802cb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c002662880 CR3: 000000000bc8e000 CR4: 0000000000150ee0
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 51 0d a1 f8 e9 52 ff ff ff 4c 89 e7 e8 44 0d a1 f8 eb 93 66 90 e9 07 00 00 00 0f 00 2d d4 34 4d 00 fb f4 <c3> cc 41 55 41 54 55 48 89 fd 53 e8 a2 0b 5c f8 e8 2d 60 fd ff 48
RSP: 0018:ffffc9000042fdf8 EFLAGS: 00000206
RAX: 0000000000128d03 RBX: ffff888011a50000 RCX: ffffffff89162231
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000001 R09: ffff88802cb361cb
R10: ffffed1005966c39 R11: 0000000000000000 R12: ffffed100234a000
R13: 0000000000000001 R14: ffffffff8dc96490 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_secondary+0x274/0x350 arch/x86/kernel/smpboot.c:272
 secondary_startup_64_no_verify+0xb0/0xbb