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WARNING: kernel/rcu/tree_stall.h:1049 at rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1049, CPU#1: iou-sqp-6156/6157
Modules linked in:
CPU: 1 UID: 0 PID: 6157 Comm: iou-sqp-6156 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+0x2e4/0x470 kernel/rcu/tree_stall.h:1049
Code: ff ff 48 c7 c7 a0 35 af 99 be 04 00 00 00 e8 83 35 80 00 4c 89 f7 b8 01 00 00 00 87 05 95 07 07 18 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff c0 46 14 8e 74 47 48 c7 c0 a0 5f a2 8f 48 c1 e8
RSP: 0018:ffffc90000a08b78 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000a06 RCX: ffffffff81a82dfd
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8e1446c0
RBP: ffffc90000a08e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff335e6b4 R12: 0000000000002904
R13: 1ffff110170e7762 R14: ffffffff8e1446c0 R15: dffffc0000000000
FS:  0000555566bad500(0000) GS:ffff888125d25000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555566bad808 CR3: 000000007dcb4000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 rcu_core+0x6a9/0x1870 kernel/rcu/tree.c:2852
 handle_softirqs+0x27d/0x850 kernel/softirq.c:626
 __do_softirq kernel/softirq.c:660 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:727
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:743
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 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:check_kcov_mode kernel/kcov.c:194 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x37/0x90 kernel/kcov.c:314
Code: 08 b0 9f 92 65 8b 0d 78 f3 dd 10 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba 6c 16 00 00 00 74 52 8b 8a 48 16 00 00 <83> f9 03 75 47 48 8b 8a 50 16 00 00 44 8b 8a 4c 16 00 00 49 c1 e1
RSP: 0018:ffffc90003437a40 EFLAGS: 00000246
RAX: ffffffff84841a63 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88802f6e5b80 RSI: 0000000000000001 RDI: 0000000000000007
RBP: 0000000000000000 R08: ffff88806d655143 R09: 1ffff1100dacaa28
R10: dffffc0000000000 R11: ffffed100dacaa29 R12: ffff88806d655140
R13: dffffc0000000000 R14: 0000000000000001 R15: ffffc90003437c40
 cpu_max_bits_warn include/linux/cpumask.h:138 [inline]
 cpumask_check include/linux/cpumask.h:145 [inline]
 cpumask_test_cpu include/linux/cpumask.h:649 [inline]
 cpu_online include/linux/cpumask.h:1231 [inline]
 trace_io_uring_task_work_run include/trace/events/io_uring.h:601 [inline]
 tctx_task_work_run+0xe3/0x2c0 io_uring/io_uring.c:1188
 io_sq_tw io_uring/sqpoll.c:279 [inline]
 io_sq_thread+0xf95/0x2020 io_uring/sqpoll.c:350
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
----------------
Code disassembly (best guess):
   0:	08 b0 9f 92 65 8b    	or     %dh,-0x749a6d61(%rax)
   6:	0d 78 f3 dd 10       	or     $0x10ddf378,%eax
   b:	81 e1 00 01 ff 00    	and    $0xff0100,%ecx
  11:	74 11                	je     0x24
  13:	81 f9 00 01 00 00    	cmp    $0x100,%ecx
  19:	75 5b                	jne    0x76
  1b:	83 ba 6c 16 00 00 00 	cmpl   $0x0,0x166c(%rdx)
  22:	74 52                	je     0x76
  24:	8b 8a 48 16 00 00    	mov    0x1648(%rdx),%ecx
* 2a:	83 f9 03             	cmp    $0x3,%ecx <-- trapping instruction
  2d:	75 47                	jne    0x76
  2f:	48 8b 8a 50 16 00 00 	mov    0x1650(%rdx),%rcx
  36:	44 8b 8a 4c 16 00 00 	mov    0x164c(%rdx),%r9d
  3d:	49                   	rex.WB
  3e:	c1                   	.byte 0xc1
  3f:	e1                   	.byte 0xe1