------------[ cut here ]------------
WARNING: CPU: 1 PID: 20136 at kernel/rcu/tree_stall.h:1050 rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1050
Modules linked in:
CPU: 1 UID: 0 PID: 20136 Comm: syz.8.3712 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1050
Code: ff ff 48 c7 c7 60 94 7d 99 be 04 00 00 00 e8 e3 e7 7e 00 4c 89 f7 b8 01 00 00 00 87 05 b5 af d6 17 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff 00 26 f4 8d 74 47 48 c7 c0 90 02 7d 8f 48 c1 e8
RSP: 0018:ffffc90000a08bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000a02 RCX: ffffffff81a6e49d
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8df42600
RBP: ffffc90000a08e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff32fb28c R12: 0000000000002904
R13: 1ffff11017127602 R14: ffffffff8df42600 R15: dffffc0000000000
FS:  00007f24762c96c0(0000) GS:ffff88812623e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000007c590000 CR4: 00000000003526f0
DR0: ffff8880b8927a20 DR1: ffff8880b8927a20 DR2: ffff8880b8927a20
DR3: ffff8880b8927a20 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_core+0x5fa/0x1770 kernel/rcu/tree.c:2856
 handle_softirqs+0x286/0x870 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd3c/0x12d0 kernel/smp.c:877
Code: 01 31 ff e8 96 73 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 41 6f 0b 00 eb 38 f3 90 42 0f b6 04 2b 84 c0 75 11 <41> f7 04 24 01 00 00 00 74 1e e8 25 6f 0b 00 eb e4 44 89 e1 80 e1
RSP: 0018:ffffc9000deef3a0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff11017108441 RCX: ffff888027643c80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000deef520 R08: ffffffff8f7cd277 R09: 1ffffffff1ef9a4e
R10: dffffc0000000000 R11: fffffbfff1ef9a4f R12: ffff8880b8842208
R13: dffffc0000000000 R14: ffff8880b893b240 R15: 0000000000000000
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
 on_each_cpu include/linux/smp.h:71 [inline]
 smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2713 [inline]
 smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2923
 __static_call_transform+0x4eb/0x750 arch/x86/kernel/static_call.c:111
 arch_static_call_transform+0x98/0xc0 arch/x86/kernel/static_call.c:-1
 __static_call_update+0xe4/0x5d0 kernel/static_call_inline.c:147
 bpf_dispatcher_update kernel/bpf/dispatcher.c:126 [inline]
 bpf_dispatcher_change_prog+0xa4c/0xc90 kernel/bpf/dispatcher.c:168
 bpf_prog_test_run_xdp+0x911/0x10e0 net/bpf/test_run.c:1408
 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4688
 __sys_bpf+0x562/0x860 kernel/bpf/syscall.c:6167
 __do_sys_bpf kernel/bpf/syscall.c:6259 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6257 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6257
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f247538efc9
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:00007f24762c9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f24755e6090 RCX: 00007f247538efc9
RDX: 0000000000000050 RSI: 0000200000000c80 RDI: 000000000000000a
RBP: 00007f2475411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f24755e6128 R14: 00007f24755e6090 R15: 00007ffe99a927b8
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	31 ff                	xor    %edi,%edi
   2:	e8 96 73 0b 00       	call   0xb739d
   7:	41 83 e5 01          	and    $0x1,%r13d
   b:	49 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%r13
  12:	fc ff df
  15:	75 07                	jne    0x1e
  17:	e8 41 6f 0b 00       	call   0xb6f5d
  1c:	eb 38                	jmp    0x56
  1e:	f3 90                	pause
  20:	42 0f b6 04 2b       	movzbl (%rbx,%r13,1),%eax
  25:	84 c0                	test   %al,%al
  27:	75 11                	jne    0x3a
* 29:	41 f7 04 24 01 00 00 	testl  $0x1,(%r12) <-- trapping instruction
  30:	00
  31:	74 1e                	je     0x51
  33:	e8 25 6f 0b 00       	call   0xb6f5d
  38:	eb e4                	jmp    0x1e
  3a:	44 89 e1             	mov    %r12d,%ecx
  3d:	80                   	.byte 0x80
  3e:	e1                   	.byte 0xe1