------------[ cut here ]------------
WARNING: CPU: 0 PID: 26519 at kernel/rcu/tree_stall.h:1015 rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1015
Modules linked in:
CPU: 0 UID: 0 PID: 26519 Comm: syz.1.5461 Not tainted 6.16.0-rc5-syzkaller-00266-g3f31a806a62e #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1015
Code: 88 61 01 00 00 be 04 00 00 00 48 c7 c7 80 8f df 9a e8 90 da 7f 00 b8 01 00 00 00 87 05 e5 21 3e 19 85 c0 0f 85 3d 01 00 00 90 <0f> 0b 90 48 c7 c3 24 d3 a9 90 48 81 fd c0 fa 5c 8e 74 5a 48 b8 00
RSP: 0018:ffffc90000007df0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000002904 RCX: ffffffff81a16d90
RDX: fffffbfff35bf1f0 RSI: 0000000000000004 RDI: ffffffff9adf8f80
RBP: ffffffff8e5cfac0 R08: 0000000000000001 R09: fffffbfff35bf1f0
R10: 0000000000000003 R11: 0000000000000001 R12: 1ffffffff1c42240
R13: 0000000000000246 R14: ffffffff8e5cfac0 R15: ffff88802b23b412
FS:  0000000000000000(0000) GS:ffff888097520000(0000) knlGS:0000000000000000
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000571154c0 CR3: 000000000e382000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 rcu_check_gp_start_stall kernel/rcu/tree_stall.h:978 [inline]
 rcu_core+0x4cf/0x14e0 kernel/rcu/tree.c:2827
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0xd7b/0x1510 kernel/smp.c:885
Code: e8 9a 10 0c 00 45 85 ed 74 46 48 8b 14 24 49 89 d6 49 89 d5 49 c1 ee 03 41 83 e5 07 4d 01 e6 41 83 c5 03 e8 37 15 0c 00 f3 90 <41> 0f b6 06 41 38 c5 7c 08 84 c0 0f 85 6f 05 00 00 8b 43 08 31 ff
RSP: 0018:ffffc9000d2a72a8 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff88802b33ff60 RCX: ffffffff81af49cd
RDX: ffff888013ce8000 RSI: ffffffff81af49a9 RDI: 0000000000000005
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000003 R14: ffffed1005667fed R15: ffff88802b23b6c0
 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1052
 kvm_flush_tlb_multi+0x266/0x3b0 arch/x86/kernel/kvm.c:679
 __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+0x4a0/0x1790 arch/x86/mm/tlb.c:1451
 arch_flush_tlb_batched_pending arch/x86/include/asm/tlbflush.h:361 [inline]
 flush_tlb_batched_pending+0x93/0xd0 mm/rmap.c:749
 zap_pte_range mm/memory.c:1725 [inline]
 zap_pmd_range mm/memory.c:1827 [inline]
 zap_pud_range mm/memory.c:1856 [inline]
 zap_p4d_range mm/memory.c:1877 [inline]
 unmap_page_range+0xbde/0x4350 mm/memory.c:1898
 unmap_single_vma.constprop.0+0x153/0x240 mm/memory.c:1941
 unmap_vmas+0x218/0x470 mm/memory.c:1985
 exit_mmap+0x1b9/0xb90 mm/mmap.c:1284
 __mmput+0x12a/0x410 kernel/fork.c:1121
 mmput+0x62/0x70 kernel/fork.c:1144
 exit_mm kernel/exit.c:581 [inline]
 do_exit+0x7c4/0x2bd0 kernel/exit.c:952
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1105
 get_signal+0x2673/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x790 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x84/0x110 kernel/entry/common.c:111
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 __do_fast_syscall_32+0x2ac/0x3a0 arch/x86/entry/syscall_32.c:309
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf712e579
Code: Unable to access opcode bytes at 0xf712e54f.
RSP: 002b:00000000ffa94860 EFLAGS: 00000293 ORIG_RAX: 000000000000010b
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 00000000ffa94894 RSI: 00000000ffa9488c RDI: 00000000ffa94894
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	e8 9a 10 0c 00       	call   0xc109f
   5:	45 85 ed             	test   %r13d,%r13d
   8:	74 46                	je     0x50
   a:	48 8b 14 24          	mov    (%rsp),%rdx
   e:	49 89 d6             	mov    %rdx,%r14
  11:	49 89 d5             	mov    %rdx,%r13
  14:	49 c1 ee 03          	shr    $0x3,%r14
  18:	41 83 e5 07          	and    $0x7,%r13d
  1c:	4d 01 e6             	add    %r12,%r14
  1f:	41 83 c5 03          	add    $0x3,%r13d
  23:	e8 37 15 0c 00       	call   0xc155f
  28:	f3 90                	pause
* 2a:	41 0f b6 06          	movzbl (%r14),%eax <-- trapping instruction
  2e:	41 38 c5             	cmp    %al,%r13b
  31:	7c 08                	jl     0x3b
  33:	84 c0                	test   %al,%al
  35:	0f 85 6f 05 00 00    	jne    0x5aa
  3b:	8b 43 08             	mov    0x8(%rbx),%eax
  3e:	31 ff                	xor    %edi,%edi