------------[ cut here ]------------
WARNING: CPU: 3 PID: 0 at kernel/rcu/tree_stall.h:894 rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:886
Modules linked in:
CPU: 3 PID: 0 Comm: swapper/3 Not tainted 5.14.0-rc2-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:894
Code: 0f 88 fa 00 00 00 be 04 00 00 00 48 c7 c7 60 05 22 90 e8 fe 1d 5a 00 b8 01 00 00 00 87 05 83 76 c0 0e 85 c0 0f 85 c9 00 00 00 <0f> 0b 48 81 fd 00 48 98 8b 48 c7 c3 ec 7f 6c 8d 74 58 48 b8 00 00
RSP: 0018:ffffc900005b8e30 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 000000010000c9b0 RCX: ffffffff81618ed2
RDX: fffffbfff20440ac RSI: 0000000000000004 RDI: ffffffff90220560
RBP: ffffffff8b984800 R08: 0000000000000001 R09: 0000000000000003
R10: fffffbfff20440ac R11: 1ffff110059aa53e R12: 1ffffffff16c1e30
R13: 0000000000000246 R14: ffff88802cd52912 R15: 000000000000000a
FS:  0000000000000000(0000) GS:ffff88802cd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c010a925c0 CR3: 00000000281e7000 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:857 [inline]
 rcu_core+0x4df/0x1380 kernel/rcu/tree.c:2780
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
 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:638
RIP: 0010:default_idle+0xb/0x10 arch/x86/kernel/process.c:717
Code: ff ff e8 08 59 8f f8 e9 24 fe ff ff e8 be 5b fd ff cc cc cc cc cc cc cc cc cc cc cc cc cc cc eb 07 0f 00 2d 07 cc 59 00 fb f4 <c3> 0f 1f 40 00 41 54 be 08 00 00 00 53 65 48 8b 1c 25 00 f0 01 00
RSP: 0018:ffffc9000045fdf8 EFLAGS: 00000206
RAX: 000000000030bf1b RBX: ffff88801123d4c0 RCX: ffffffff8929b47f
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000003 R08: 0000000000000001 R09: ffff88802cd52a4b
R10: ffffed10059aa549 R11: 0000000000000000 R12: ffffed1002247a98
R13: 0000000000000003 R14: ffffffff8d6c4cd0 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+0x265/0x340 arch/x86/kernel/smpboot.c:270
 secondary_startup_64_no_verify+0xb0/0xbb