------------[ cut here ]------------
WARNING: kernel/rcu/tree_stall.h:1049 at rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1049, CPU#0: syz.7.301/6871
Modules linked in:
CPU: 0 UID: 0 PID: 6871 Comm: syz.7.301 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1049
Code: 88 61 01 00 00 be 04 00 00 00 48 c7 c7 c0 42 c2 9a e8 d0 3a 85 00 b8 01 00 00 00 87 05 05 b5 1e 19 85 c0 0f 85 3d 01 00 00 90 <0f> 0b 90 48 c7 c3 74 e0 88 90 48 81 fd 00 46 3d 8e 74 5a 48 b8 00
RSP: 0018:ffffc90000007df0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000002904 RCX: ffffffff81a38db0
RDX: fffffbfff3584858 RSI: 0000000000000004 RDI: ffffffff9ac242c0
RBP: ffffffff8e3d4600 R08: 0000000000000001 R09: fffffbfff3584858
R10: 0000000000000003 R11: ffff88803182d4b0 R12: 1ffffffff1c02250
R13: 0000000000000246 R14: ffffffff8e3d4600 R15: ffff8880b843bc52
FS:  00007fb8919946c0(0000) GS:ffff8881248f6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fefefbbcfeb CR3: 0000000028a4e000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 rcu_check_gp_start_stall kernel/rcu/tree_stall.h:1012 [inline]
 rcu_core+0x4cf/0x15f0 kernel/rcu/tree.c:2852
 handle_softirqs+0x219/0x950 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:finish_task_switch.isra.0+0x210/0xbd0 kernel/sched/core.c:5114
Code: ac 08 00 00 44 8b 05 a3 c2 fd 0e 45 85 c0 0f 85 be 01 00 00 4c 89 e7 e8 ae f6 ff ff e8 49 eb 3b 00 fb 65 48 8b 1d 28 82 27 12 <48> 8d bb 48 16 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc9000c297918 EFLAGS: 00000206
RAX: 00000000036df76f RBX: ffff88803182c980 RCX: ffffffff81c7083f
RDX: 0000000000000000 RSI: ffffffff8dacdbe3 RDI: ffffffff8bf2b380
RBP: ffffc9000c297960 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9088afd7 R11: ffff88803182d4b0 R12: ffff8880b843ac80
R13: ffff88801d6c24c0 R14: 0000000000000000 R15: dffffc0000000000
 context_switch kernel/sched/core.c:5259 [inline]
 __schedule+0x1141/0x6150 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6960
 futex_do_wait+0x88/0x180 kernel/futex/waitwake.c:358
 __futex_wait+0x1b8/0x2f0 kernel/futex/waitwake.c:687
 futex_wait+0xe8/0x380 kernel/futex/waitwake.c:715
 do_futex+0x229/0x350 kernel/futex/syscalls.c:130
 __do_sys_futex kernel/futex/syscalls.c:207 [inline]
 __se_sys_futex kernel/futex/syscalls.c:188 [inline]
 __x64_sys_futex+0x1e0/0x4c0 kernel/futex/syscalls.c:188
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb890b8f749
Code: 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 01 48
RSP: 002b:00007fb8919940e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fb890de5fa8 RCX: 00007fb890b8f749
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb890de5fa8
RBP: 00007fb890de5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb890de6038 R14: 00007ffca5ac54e0 R15: 00007ffca5ac55c8
 </TASK>
----------------
Code disassembly (best guess):
   0:	ac                   	lods   %ds:(%rsi),%al
   1:	08 00                	or     %al,(%rax)
   3:	00 44 8b 05          	add    %al,0x5(%rbx,%rcx,4)
   7:	a3 c2 fd 0e 45 85 c0 	movabs %eax,0x850fc085450efdc2
   e:	0f 85
  10:	be 01 00 00 4c       	mov    $0x4c000001,%esi
  15:	89 e7                	mov    %esp,%edi
  17:	e8 ae f6 ff ff       	call   0xfffff6ca
  1c:	e8 49 eb 3b 00       	call   0x3beb6a
  21:	fb                   	sti
  22:	65 48 8b 1d 28 82 27 	mov    %gs:0x12278228(%rip),%rbx        # 0x12278252
  29:	12
* 2a:	48 8d bb 48 16 00 00 	lea    0x1648(%rbx),%rdi <-- trapping instruction
  31:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  38:	fc ff df
  3b:	48 89 fa             	mov    %rdi,%rdx
  3e:	48                   	rex.W
  3f:	c1                   	.byte 0xc1