------------[ cut here ]------------
WARNING: CPU: 2 PID: 0 at kernel/rcu/tree_stall.h:954 rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:946
Modules linked in:
CPU: 2 PID: 0 Comm: swapper/2 Not tainted 6.0.0-rc4-syzkaller-00302-gb96fbd602d35 #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:954
Code: 0f 88 fa 00 00 00 be 04 00 00 00 48 c7 c7 20 1a 1b 91 e8 4e 16 61 00 b8 01 00 00 00 87 05 43 57 b5 0f 85 c0 0f 85 c9 00 00 00 <0f> 0b 48 81 fd 40 0e f9 8b 48 c7 c3 ac 5d de 8d 74 58 48 b8 00 00
RSP: 0018:ffffc900007a0e38 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000100045fc7 RCX: ffffffff8165c2d2
RDX: fffffbfff2236344 RSI: 0000000000000004 RDI: ffffffff911b1a20
RBP: ffffffff8bf90e40 R08: 0000000000000001 R09: 0000000000000003
R10: fffffbfff2236344 R11: 0000000000000001 R12: 1ffffffff1781e40
R13: 0000000000000246 R14: 0000000000000009 R15: ffff88802ca3aed2
FS:  0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005648d4164a10 CR3: 000000001f9cd000 CR4: 0000000000150ee0
Call Trace:
 <IRQ>
 rcu_check_gp_start_stall kernel/rcu/tree_stall.h:917 [inline]
 rcu_core+0x4dd/0x1890 kernel/rcu/tree.c:2500
 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:default_idle+0xb/0x10 arch/x86/kernel/process.c:731
Code: f8 e9 8c fd ff ff 4c 89 f7 e8 51 49 44 f8 e9 3a fd ff ff cc cc cc cc cc cc cc cc cc cc cc cc 66 90 0f 00 2d 47 41 64 00 fb f4 <c3> 0f 1f 40 00 41 54 be 08 00 00 00 53 65 48 8b 1c 25 80 6f 02 00
RSP: 0018:ffffc9000068fe00 EFLAGS: 00000246
RAX: 0000000000cbe0bd RBX: ffff888012532040 RCX: ffffffff897f8705
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000002 R08: 0000000000000001 R09: ffff88802ca34c4b
R10: ffffed1005946989 R11: 0000000000000001 R12: ffffed10024a6408
R13: 0000000000000002 R14: ffffffff8dde2a10 R15: 0000000000000000
 default_idle_call+0x80/0xc0 kernel/sched/idle.c:109
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x401/0x590 kernel/sched/idle.c:303
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
 start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:262
 secondary_startup_64_no_verify+0xce/0xdb
 </TASK>
----------------
Code disassembly (best guess):
   0:	f8                   	clc
   1:	e9 8c fd ff ff       	jmpq   0xfffffd92
   6:	4c 89 f7             	mov    %r14,%rdi
   9:	e8 51 49 44 f8       	callq  0xf844495f
   e:	e9 3a fd ff ff       	jmpq   0xfffffd4d
  13:	cc                   	int3
  14:	cc                   	int3
  15:	cc                   	int3
  16:	cc                   	int3
  17:	cc                   	int3
  18:	cc                   	int3
  19:	cc                   	int3
  1a:	cc                   	int3
  1b:	cc                   	int3
  1c:	cc                   	int3
  1d:	cc                   	int3
  1e:	cc                   	int3
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d 47 41 64 00 	verw   0x644147(%rip)        # 0x64416f
  28:	fb                   	sti
  29:	f4                   	hlt
* 2a:	c3                   	retq <-- trapping instruction
  2b:	0f 1f 40 00          	nopl   0x0(%rax)
  2f:	41 54                	push   %r12
  31:	be 08 00 00 00       	mov    $0x8,%esi
  36:	53                   	push   %rbx
  37:	65 48 8b 1c 25 80 6f 	mov    %gs:0x26f80,%rbx
  3e:	02 00