------------[ cut here ]------------
kernel BUG at [] mm/page_table_check.c:118!
Kernel BUG [#1]
Modules linked in:
CPU: 0 UID: 0 PID: 3887 Comm: syz.0.17 Tainted: G        W           syzkaller #0 PREEMPT 
Tainted: [W]=WARN
Hardware name: riscv-virtio,qemu (DT)
epc : page_table_check_set+0x996/0xc38 mm/page_table_check.c:118
 ra : page_table_check_set+0x996/0xc38 mm/page_table_check.c:118
epc : ffffffff80c6978e ra : ffffffff80c6978e sp : ffff8f800a196e00
 gp : ffffffff8a24e5c0 tp : ffffaf801ef95040 t0 : ffff8f800a1973b8
 t1 : fffff5ef02720809 t2 : ffffffff80ac862c s0 : ffff8f800a196e80
 s1 : 0000000000000001 a0 : 0000000000000001 a1 : 0000000000000000
 a2 : 0000000000080000 a3 : ffffffff80c6978e a4 : ffff8f8004481380
 a5 : 0000000000028380 a6 : 0000000000000003 a7 : ffffaf801390404b
 s2 : 00000000000b3400 s3 : 0000000000000000 s4 : ffffaf8013904000
 s5 : 0000000000000200 s6 : 0000000000000001 s7 : dfffffff00000000
 s8 : 0000000000007fff s9 : ffffffff88a50700 s10: 0000000000000000
 s11: ffffffff8a36bc60 t3 : 0000000000000001 t4 : fffff5ef02720809
 t5 : fffff5ef0272080a t6 : 0000000000000002 ssp : 0000000000000000
status: 0000000200000120 badaddr: ffffffff80c6978e cause: 0000000000000003
[<ffffffff80c6978e>] page_table_check_set+0x996/0xc38 mm/page_table_check.c:118
[<ffffffff80c69ef8>] __page_table_check_ptes_set+0x264/0x47c mm/page_table_check.c:212
[<ffffffff80bf52a6>] page_table_check_ptes_set include/linux/page_table_check.h:83 [inline]
[<ffffffff80bf52a6>] set_ptes arch/riscv/include/asm/pgtable.h:625 [inline]
[<ffffffff80bf52a6>] __split_huge_pmd_locked mm/huge_memory.c:3358 [inline]
[<ffffffff80bf52a6>] split_huge_pmd_locked+0x1e2a/0x2388 mm/huge_memory.c:3376
[<ffffffff80bf5aae>] __split_huge_pmd+0x2aa/0x3d4 mm/huge_memory.c:3390
[<ffffffff80bf81c2>] split_huge_pmd_address mm/huge_memory.c:3403 [inline]
[<ffffffff80bf81c2>] split_huge_pmd_if_needed mm/huge_memory.c:3415 [inline]
[<ffffffff80bf81c2>] split_huge_pmd_if_needed mm/huge_memory.c:3406 [inline]
[<ffffffff80bf81c2>] vma_adjust_trans_huge+0x272/0x4b4 mm/huge_memory.c:3427
[<ffffffff80abf348>] __split_vma+0x978/0xf10 mm/vma.c:557
[<ffffffff80abfabc>] vms_gather_munmap_vmas+0x1dc/0x14d4 mm/vma.c:1427
[<ffffffff80ac886c>] do_vmi_align_munmap+0x240/0x6d8 mm/vma.c:1595
[<ffffffff80ac8ed2>] do_vmi_munmap+0x1ce/0x3bc mm/vma.c:1652
[<ffffffff80a54cc0>] do_munmap+0xd4/0x10c mm/mmap.c:1067
[<ffffffff80a6ba84>] mremap_to+0x28c/0x474 mm/mremap.c:1448
[<ffffffff80a6c65e>] do_mremap mm/mremap.c:1999 [inline]
[<ffffffff80a6c65e>] __do_sys_mremap+0x9f2/0x16d0 mm/mremap.c:2055
[<ffffffff80a6d3dc>] __se_sys_mremap mm/mremap.c:2023 [inline]
[<ffffffff80a6d3dc>] __riscv_sys_mremap+0xa0/0x124 mm/mremap.c:2023
[<ffffffff80078f3a>] syscall_handler+0x92/0x114 arch/riscv/include/asm/syscall.h:112
[<ffffffff86482108>] do_trap_ecall_u+0x3dc/0x61c arch/riscv/kernel/traps.c:342
[<ffffffff864ad412>] handle_exception+0x15e/0x16a arch/riscv/kernel/entry.S:232
Code: 8097 ff8c 80e7 b9a0 83e3 e004 8097 ff8c 80e7 06e0 (9002) 8097 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	ff8c8097          	auipc	ra,0xff8c8
   4:	b9a080e7          	jalr	-1126(ra) # 0xff8c7b9a
   8:	e00483e3          	beqz	s1,0xfffffffffffffe0e
   c:	ff8c8097          	auipc	ra,0xff8c8
  10:	06e080e7          	jalr	110(ra) # 0xff8c807a
* 14:	9002                	ebreak <-- trapping instruction
  16:	9780                	.short	0x8097