------------[ cut here ]------------
kernel BUG at [] mm/page_table_check.c:118!
Kernel BUG [#1]
Modules linked in:
CPU: 1 UID: 0 PID: 3897 Comm: syz.0.12 Not tainted syzkaller #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
epc : page_table_check_set+0xa74/0xd30 mm/page_table_check.c:118
 ra : page_table_check_set+0xa74/0xd30 mm/page_table_check.c:118
epc : ffffffff80bfcb7c ra : ffffffff80bfcb7c sp : ffff8f800ad17520
 gp : ffffffff89f9df20 tp : ffffaf801b0cb500 t0 : ffff8f800ad17d50
 t1 : fffff5ef0269cc09 t2 : ffffffff86806d68 s0 : ffff8f800ad175a0
 s1 : 0000000000000001 a0 : 0000000000000001 a1 : 0000000000000000
 a2 : 0000000000080000 a3 : ffffffff80bfcb7c a4 : ffff8f8004a0c4a0
 a5 : 00000000000374a0 a6 : 0000000000000003 a7 : ffffaf80134e604b
 s2 : 00000000000b2e00 s3 : 0000000000000000 s4 : ffffaf80134e6000
 s5 : 0000000000000200 s6 : 0000000000000001 s7 : dfffffff00000000
 s8 : 0000000000007fff s9 : ffffffff88825fa0 s10: 0000000000000000
 s11: ffffffff8a0b5d80 t3 : 0000000000000001 t4 : fffff5ef0269cc09
 t5 : fffff5ef0269cc0a t6 : 0000000000000002 ssp : 0000000000000000
status: 0000000200000120 badaddr: ffffffff80bfcb7c cause: 0000000000000003
[<ffffffff80bfcb7c>] page_table_check_set+0xa74/0xd30 mm/page_table_check.c:118
[<ffffffff80bfd300>] __page_table_check_ptes_set+0x264/0x47c mm/page_table_check.c:212
[<ffffffff80b8b0de>] page_table_check_ptes_set include/linux/page_table_check.h:76 [inline]
[<ffffffff80b8b0de>] set_ptes arch/riscv/include/asm/pgtable.h:640 [inline]
[<ffffffff80b8b0de>] __split_huge_pmd_locked mm/huge_memory.c:3252 [inline]
[<ffffffff80b8b0de>] split_huge_pmd_locked+0x2b0a/0x326c mm/huge_memory.c:3270
[<ffffffff80b8bafa>] __split_huge_pmd+0x2ba/0x3e4 mm/huge_memory.c:3284
[<ffffffff80c0928c>] move_pages+0x19d4/0x55c0 mm/userfaultfd.c:1877
[<ffffffff80dd33d6>] userfaultfd_move fs/userfaultfd.c:1942 [inline]
[<ffffffff80dd33d6>] userfaultfd_ioctl+0x10c6/0x44e0 fs/userfaultfd.c:2065
[<ffffffff80ca9130>] vfs_ioctl fs/ioctl.c:51 [inline]
[<ffffffff80ca9130>] __do_sys_ioctl fs/ioctl.c:597 [inline]
[<ffffffff80ca9130>] __se_sys_ioctl fs/ioctl.c:583 [inline]
[<ffffffff80ca9130>] __riscv_sys_ioctl+0x17c/0x1e4 fs/ioctl.c:583
[<ffffffff80078192>] syscall_handler+0x92/0x114 arch/riscv/include/asm/syscall.h:112
[<ffffffff86391c0a>] do_trap_ecall_u+0x3d2/0x58c arch/riscv/kernel/traps.c:344
[<ffffffff863bb61e>] handle_exception+0x15e/0x16a arch/riscv/kernel/entry.S:232
Code: 7097 ff90 80e7 4580 81e3 e004 8097 ff90 80e7 9380 (9002) 8097 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	ff907097          	auipc	ra,0xff907
   4:	458080e7          	jalr	1112(ra) # 0xff907458
   8:	e00481e3          	beqz	s1,0xfffffffffffffe0a
   c:	ff908097          	auipc	ra,0xff908
  10:	938080e7          	jalr	-1736(ra) # 0xff907944
* 14:	9002                	ebreak <-- trapping instruction
  16:	9780                	.short	0x8097