------------[ cut here ]------------
WARNING: CPU: 1 PID: 0 at kernel/rcu/tree_stall.h:970 rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:962
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:970
Code: ff ff ff 48 c7 c7 20 8f c4 96 be 04 00 00 00 e8 ba 7a 66 00 48 89 df b8 01 00 00 00 87 05 3c 75 57 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff 40 33 b3 8c 74 47 48 c7 c0 e4 40 20 8e 48 c1 e8 03
RSP: 0018:ffffc900001e0b78 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8cb33340 RCX: ffffffff816d19d6
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8cb33340
RBP: ffffc900001e0df0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2d891e4 R12: 0000000000002904
R13: dffffc0000000000 R14: 0000000000000a06 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e515ff8 CR3: 0000000066dcf000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_core+0x60b/0x1740 kernel/rcu/tree.c:2552
 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:default_idle+0xb/0x10 arch/x86/kernel/process.c:742
Code: 48 89 df e8 97 04 9b f7 e9 44 ff ff ff e8 fd 06 f6 ff 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 66 90 0f 00 2d 67 1a 4e 00 fb f4 <c3> 0f 1f 40 00 41 57 41 56 53 49 be 00 00 00 00 00 fc ff df 65 48
RSP: 0018:ffffc90000177de8 EFLAGS: 000002c6
RAX: 6d1434a7bc36de00 RBX: ffffffff8a389347 RCX: 6d1434a7bc36de00
RDX: 0000000000000001 RSI: ffffffff8a8c19a0 RDI: ffffffff8adf1b60
RBP: ffffc90000177f20 R08: ffff8880b8f3580b R09: 1ffff110171e6b01
R10: dffffc0000000000 R11: ffffed10171e6b02 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888017739dc0 R15: 1ffff9200002efc8
 default_idle_call+0x84/0xc0 kernel/sched/idle.c:109
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x250/0x680 kernel/sched/idle.c:323
 cpu_startup_entry+0x3f/0x60 kernel/sched/idle.c:422
 start_secondary+0xe4/0xf0 arch/x86/kernel/smpboot.c:281
 secondary_startup_64_no_verify+0xcf/0xdb
 </TASK>
----------------
Code disassembly (best guess):
   0:	48 89 df             	mov    %rbx,%rdi
   3:	e8 97 04 9b f7       	call   0xf79b049f
   8:	e9 44 ff ff ff       	jmp    0xffffff51
   d:	e8 fd 06 f6 ff       	call   0xfff6070f
  12:	00 00                	add    %al,(%rax)
  14:	cc                   	int3
  15:	cc                   	int3
  16:	00 00                	add    %al,(%rax)
  18:	cc                   	int3
  19:	cc                   	int3
  1a:	00 00                	add    %al,(%rax)
  1c:	cc                   	int3
  1d:	cc                   	int3
  1e:	00 66 90             	add    %ah,-0x70(%rsi)
  21:	0f 00 2d 67 1a 4e 00 	verw   0x4e1a67(%rip)        # 0x4e1a8f
  28:	fb                   	sti
  29:	f4                   	hlt
* 2a:	c3                   	ret <-- trapping instruction
  2b:	0f 1f 40 00          	nopl   0x0(%rax)
  2f:	41 57                	push   %r15
  31:	41 56                	push   %r14
  33:	53                   	push   %rbx
  34:	49 be 00 00 00 00 00 	movabs $0xdffffc0000000000,%r14
  3b:	fc ff df
  3e:	65                   	gs
  3f:	48                   	rex.W