------------[ cut here ]------------
WARNING: CPU: 0 PID: 21334 at kernel/rcu/tree_stall.h:1001 rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:993
Modules linked in:
CPU: 0 PID: 21334 Comm: syz.1.4674 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:1001
Code: ff ff ff 48 c7 c7 a0 24 31 97 be 04 00 00 00 e8 aa ea 6d 00 48 89 df b8 01 00 00 00 87 05 1c a2 bf 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff 80 73 13 8d 74 47 48 c7 c0 9c 6f 8b 8e 48 c1 e8 03
RSP: 0018:ffffc90000007bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8d137380 RCX: ffffffff81718276
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8d137380
RBP: ffffc90000007e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2e62494 R12: 0000000000002904
R13: ffffffff8d137380 R14: 0000000000000a02 R15: dffffc0000000000
FS:  000055556b029500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa33fbea540 CR3: 000000002e9de000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 rcu_core+0x635/0x1770 kernel/rcu/tree.c:2462
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 00 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ca bc d7 f6 48 89 df e8 82 91 d8 f6 e8 9d a8 fc f6 fb bf 01 00 00 00 <e8> 62 98 cb f6 65 8b 05 f3 bf 72 75 85 c0 74 02 5b c3 e8 70 a7 6f
RSP: 0018:ffffc90004f0fc78 EFLAGS: 00000286
RAX: e6a89efbbbeb9c00 RBX: ffff88807f24a500 RCX: e6a89efbbbeb9c00
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: 0000000000000001
RBP: ffff88807f24a998 R08: ffffffff8e8b3aef R09: 1ffffffff1d1675d
R10: dffffc0000000000 R11: fffffbfff1d1675e R12: 1ffff1100fe49533
R13: 0000000000000021 R14: dffffc0000000000 R15: 0000000000000000
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x11f5/0x13f0 kernel/signal.c:2905
 arch_do_signal_or_restart+0xc2/0x800 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa33fb5d68e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007ffc72b81ee8 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 000055556b029500 RCX: 00007fa33fb5d68e
RDX: 00007ffc72b81f40 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fa33fe17da0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000016ca1b
R13: 00007fa33fe1609c R14: 000000000016c7d6 R15: 00007fa33fe16090
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 f3                	add    %dh,%bl
   2:	0f 1e fa             	nop    %edx
   5:	53                   	push   %rbx
   6:	48 89 fb             	mov    %rdi,%rbx
   9:	48 83 c7 18          	add    $0x18,%rdi
   d:	48 8b 74 24 08       	mov    0x8(%rsp),%rsi
  12:	e8 ca bc d7 f6       	call   0xf6d7bce1
  17:	48 89 df             	mov    %rbx,%rdi
  1a:	e8 82 91 d8 f6       	call   0xf6d891a1
  1f:	e8 9d a8 fc f6       	call   0xf6fca8c1
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 62 98 cb f6       	call   0xf6cb9891 <-- trapping instruction
  2f:	65 8b 05 f3 bf 72 75 	mov    %gs:0x7572bff3(%rip),%eax        # 0x7572c029
  36:	85 c0                	test   %eax,%eax
  38:	74 02                	je     0x3c
  3a:	5b                   	pop    %rbx
  3b:	c3                   	ret
  3c:	e8                   	.byte 0xe8
  3d:	70 a7                	jo     0xffffffe6
  3f:	6f                   	outsl  %ds:(%rsi),(%dx)