------------[ cut here ]------------
WARNING: CPU: 1 PID: 14881 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: 14881 Comm: syz.3.2330 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 13 ea 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 01 7d 8f 48 c1 e8
RSP: 0000: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: 1ffff110171275f2 R14: ffffffff8df42600 R15: dffffc0000000000
FS:  000055557200f500(0000) GS:ffff88812623e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557200f808 CR3: 00000000318fe000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 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+0xd33/0x12d0 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 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
RSP: 0000:ffffc900100c7700 EFLAGS: 00000293
RAX: ffffffff81b494cb RBX: 1ffff11017108431 RCX: ffff888026553c80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900100c7880 R08: ffffffff8f7cd177 R09: 1ffffffff1ef9a2e
R10: dffffc0000000000 R11: fffffbfff1ef9a2f R12: ffff8880b8842188
R13: dffffc0000000000 R14: ffff8880b893b1c0 R15: 0000000000000000
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
 flush_tlb_mm_range+0x6b1/0x12d0 arch/x86/mm/tlb.c:1451
 flush_tlb_page arch/x86/include/asm/tlbflush.h:324 [inline]
 ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:101
 wp_page_copy mm/memory.c:3745 [inline]
 do_wp_page+0x1bc2/0x5800 mm/memory.c:4140
 handle_pte_fault mm/memory.c:6193 [inline]
 __handle_mm_fault+0x1033/0x5400 mm/memory.c:6318
 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6487
 do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f30141b6d81
Code: d7 eb b2 66 0f 1f 44 00 00 64 48 8b 0c 25 10 00 00 00 8b 91 08 03 00 00 48 8d b9 08 03 00 00 89 d6 83 ce 02 39 d6 74 21 89 d0 <f0> 0f b1 37 89 c6 75 1b 83 e2 3b 83 ca 02 83 fa 0a 74 14 89 f0 c3
RSP: 002b:00007ffe19afc328 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 00007f30143e5fa0 RCX: 000055557200f500
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 000055557200f808
RBP: 00007f30143e7da0 R08: 7fffffffffffffff R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000006a2a5
R13: 00007f30143e6090 R14: ffffffffffffffff R15: 00007ffe19afc4b0
 </TASK>
----------------
Code disassembly (best guess):
   0:	45 8b 2c 24          	mov    (%r12),%r13d
   4:	44 89 ee             	mov    %r13d,%esi
   7:	83 e6 01             	and    $0x1,%esi
   a:	31 ff                	xor    %edi,%edi
   c:	e8 96 73 0b 00       	call   0xb73a7
  11:	41 83 e5 01          	and    $0x1,%r13d
  15:	49 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%r13
  1c:	fc ff df
  1f:	75 07                	jne    0x28
  21:	e8 41 6f 0b 00       	call   0xb6f67
  26:	eb 38                	jmp    0x60
  28:	f3 90                	pause
* 2a:	42 0f b6 04 2b       	movzbl (%rbx,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	75 11                	jne    0x44
  33:	41 f7 04 24 01 00 00 	testl  $0x1,(%r12)
  3a:	00
  3b:	74 1e                	je     0x5b
  3d:	e8                   	.byte 0xe8
  3e:	25                   	.byte 0x25
  3f:	6f                   	outsl  %ds:(%rsi),(%dx)