------------[ cut here ]------------
WARNING: CPU: 1 PID: 7944 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: 7944 Comm: syz.5.656 Not tainted 6.1.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:970
Code: ff ff ff 48 c7 c7 00 8f c2 96 be 04 00 00 00 e8 fa 47 65 00 48 89 df b8 01 00 00 00 87 05 ec f1 56 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff 80 03 b3 8c 74 47 48 c7 c0 64 80 1f 8e 48 c1 e8 03
RSP: 0018:ffffc900001e0b78 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8cb30380 RCX: ffffffff816b9d06
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8cb30380
RBP: ffffc900001e0df0 R08: 0000000000000004 R09: 0000000000000003
R10: fffffbfff2d851e0 R11: 1ffffffff2d851e0 R12: 0000000000002904
R13: dffffc0000000000 R14: 0000000000000a06 R15: dffffc0000000000
FS:  00007f0a3bfe66c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 00000000651e4000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_core+0x5d9/0x16a0 kernel/rcu/tree.c:2552
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x12f/0x220 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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: f5 ff 0f 1f 00 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 2e 31 43 f7 48 89 df e8 86 f6 43 f7 e8 91 e8 66 f7 fb bf 01 00 00 00 <e8> 36 74 37 f7 65 8b 05 07 35 e2 75 85 c0 74 02 5b c3 e8 54 46 e0
RSP: 0018:ffffc90005527bb8 EFLAGS: 00000286
RAX: 9d73e0b62dfc0400 RBX: ffff8880553d4a00 RCX: 9d73e0b62dfc0400
RDX: dffffc0000000000 RSI: ffffffff8a8c0460 RDI: 0000000000000001
RBP: ffff8880553d4e98 R08: dffffc0000000000 R09: ffffed100aa7a941
R10: ffffed100aa7a941 R11: 1ffff1100aa7a940 R12: 1ffff1100aa7a9d3
R13: 0000000000000021 R14: dffffc0000000000 R15: 0000000000000000
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x1163/0x1350 kernel/signal.c:2874
 arch_do_signal_or_restart+0xb0/0x1230 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0a3b18e9a7
Code: ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 <0f> 05 48 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89
RSP: 002b:00007f0a3bfe60e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f0a3b3b5fa8 RCX: 00007f0a3b18e9a9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f0a3b3b5fa8
RBP: 00007f0a3b3b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0a3b3b5fac
R13: 0000000000000000 R14: 00007ffd25205bf0 R15: 00007ffd25205cd8
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	0f 1f 00             	nopl   (%rax)
   3:	53                   	push   %rbx
   4:	48 89 fb             	mov    %rdi,%rbx
   7:	48 83 c7 18          	add    $0x18,%rdi
   b:	48 8b 74 24 08       	mov    0x8(%rsp),%rsi
  10:	e8 2e 31 43 f7       	call   0xf7433143
  15:	48 89 df             	mov    %rbx,%rdi
  18:	e8 86 f6 43 f7       	call   0xf743f6a3
  1d:	e8 91 e8 66 f7       	call   0xf766e8b3
  22:	fb                   	sti
  23:	bf 01 00 00 00       	mov    $0x1,%edi
* 28:	e8 36 74 37 f7       	call   0xf7377463 <-- trapping instruction
  2d:	65 8b 05 07 35 e2 75 	mov    %gs:0x75e23507(%rip),%eax        # 0x75e2353b
  34:	85 c0                	test   %eax,%eax
  36:	74 02                	je     0x3a
  38:	5b                   	pop    %rbx
  39:	c3                   	ret
  3a:	e8                   	.byte 0xe8
  3b:	54                   	push   %rsp
  3c:	46                   	rex.RX
  3d:	e0                   	.byte 0xe0