------------[ 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#1: syz.3.2349/16082
Modules linked in:
CPU: 1 UID: 0 PID: 16082 Comm: syz.3.2349 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 90 45 84 00 b8 01 00 00 00 87 05 05 c5 1e 19 85 c0 0f 85 3d 01 00 00 90 <0f> 0b 90 48 c7 c3 54 19 89 90 48 81 fd 00 46 3d 8e 74 5a 48 b8 00
RSP: 0018:ffffc90000a08df0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000002904 RCX: ffffffff81a37db0
RDX: fffffbfff3584858 RSI: 0000000000000004 RDI: ffffffff9ac242c0
RBP: ffffffff8e3d4600 R08: 0000000000000001 R09: fffffbfff3584858
R10: 0000000000000003 R11: ffff88803155e6b0 R12: 1ffffffff1c02250
R13: 0000000000000246 R14: ffffffff8e3d4600 R15: ffff8880b853bd92
FS:  00007fd9741996c0(0000) GS:ffff8881249f6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd97332b820 CR3: 000000009a304000 CR4: 0000000000350ef0
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:arch_static_branch arch/x86/include/asm/jump_label.h:37 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:139 [inline]
RIP: 0010:wrmsrq arch/x86/include/asm/msr.h:199 [inline]
RIP: 0010:native_apic_msr_write arch/x86/include/asm/apic.h:212 [inline]
RIP: 0010:native_apic_msr_write+0x28/0x40 arch/x86/include/asm/apic.h:206
Code: 90 90 f3 0f 1e fa 8d 87 30 ff ff ff 83 e0 ef 74 20 89 f8 83 e0 ef 83 f8 20 74 16 c1 ef 04 31 d2 89 f0 8d 8f 00 08 00 00 0f 30 <66> 90 e9 fc 23 a5 ff e9 f7 23 a5 ff 89 f6 31 d2 89 cf e9 21 9b 75
RSP: 0018:ffffc9000ceefbf8 EFLAGS: 00000246
RAX: 00000000000000f6 RBX: 0000000000000001 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000003f
RBP: ffff8880b8531660 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffff88803155e6b0 R12: 1ffff920019ddf84
R13: 1ffff110170a6201 R14: 0000000000000000 R15: 0000000000000000
 __apic_send_IPI_self arch/x86/include/asm/apic.h:459 [inline]
 arch_irq_work_raise+0x4f/0x70 arch/x86/kernel/irq_work.c:31
 irq_work_raise kernel/irq_work.c:84 [inline]
 __irq_work_queue_local+0x1d2/0x550 kernel/irq_work.c:112
 irq_work_queue kernel/irq_work.c:124 [inline]
 irq_work_queue+0xab/0x100 kernel/irq_work.c:116
 bpf_send_signal_common+0x3a4/0x540 kernel/trace/bpf_trace.c:871
 ____bpf_send_signal kernel/trace/bpf_trace.c:880 [inline]
 bpf_send_signal+0x1d/0x30 kernel/trace/bpf_trace.c:878
 bpf_prog_948316cddd0b7b1c+0x41/0x49
 bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
 __bpf_prog_run include/linux/filter.h:723 [inline]
 bpf_prog_run include/linux/filter.h:730 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline]
 bpf_trace_run2+0x239/0x5c0 kernel/trace/bpf_trace.c:2116
 __bpf_trace_sys_enter+0x37/0x60 include/trace/events/syscalls.h:18
 __do_trace_sys_enter include/trace/events/syscalls.h:18 [inline]
 trace_sys_enter include/trace/events/syscalls.h:18 [inline]
 syscall_trace_enter+0x1b5/0x220 kernel/entry/syscall-common.c:53
 syscall_enter_from_user_mode_work include/linux/entry-common.h:78 [inline]
 syscall_enter_from_user_mode include/linux/entry-common.h:109 [inline]
 do_syscall_64+0x42b/0xf80 arch/x86/entry/syscall_64.c:90
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd97332b829
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007fd9741989c0 EFLAGS: 00000293 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007fd9735e5fa0 RCX: 00007fd97332b829
RDX: 00007fd9741989c0 RSI: 00007fd974198af0 RDI: 0000000000000011
RBP: 00007fd973413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007fd9735e6038 R14: 00007fd9735e5fa0 R15: 00007ffca9277048
 </TASK>
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	90                   	nop
   2:	f3 0f 1e fa          	endbr64
   6:	8d 87 30 ff ff ff    	lea    -0xd0(%rdi),%eax
   c:	83 e0 ef             	and    $0xffffffef,%eax
   f:	74 20                	je     0x31
  11:	89 f8                	mov    %edi,%eax
  13:	83 e0 ef             	and    $0xffffffef,%eax
  16:	83 f8 20             	cmp    $0x20,%eax
  19:	74 16                	je     0x31
  1b:	c1 ef 04             	shr    $0x4,%edi
  1e:	31 d2                	xor    %edx,%edx
  20:	89 f0                	mov    %esi,%eax
  22:	8d 8f 00 08 00 00    	lea    0x800(%rdi),%ecx
  28:	0f 30                	wrmsr
* 2a:	66 90                	xchg   %ax,%ax <-- trapping instruction
  2c:	e9 fc 23 a5 ff       	jmp    0xffa5242d
  31:	e9 f7 23 a5 ff       	jmp    0xffa5242d
  36:	89 f6                	mov    %esi,%esi
  38:	31 d2                	xor    %edx,%edx
  3a:	89 cf                	mov    %ecx,%edi
  3c:	e9                   	.byte 0xe9
  3d:	21                   	.byte 0x21
  3e:	9b                   	fwait
  3f:	75                   	.byte 0x75