------------[ cut here ]------------
kernel BUG at [] mm/page_table_check.c:118!
Kernel BUG [#1]
Modules linked in:
CPU: 0 UID: 0 PID: 4300 Comm: syz.0.147 Not tainted syzkaller #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
epc : page_table_check_set+0x9ca/0xc72 mm/page_table_check.c:118
 ra : page_table_check_set+0x9ca/0xc72 mm/page_table_check.c:118
epc : ffffffff80c81874 ra : ffffffff80c81874 sp : ffff8f800aae6b90
 gp : ffffffff8a4a7c60 tp : ffffaf801b1c8000 t0 : ffff8f800aae7138
 t1 : fffff5ef027a9409 t2 : ffffffff86a06bd0 s0 : ffff8f800aae6c10
 s1 : 0000000000000001 a0 : 0000000000000001 a1 : 0000000000000000
 a2 : 0000000000080000 a3 : ffffffff80c81874 a4 : ffff8f80056355f8
 a5 : 00000000000285f8 a6 : 0000000000000003 a7 : ffffaf8013d4a04b
 s2 : 00000000000b4200 s3 : 0000000000000000 s4 : ffffaf8013d4a000
 s5 : 0000000000000200 s6 : 0000000000000001 s7 : dfffffff00000000
 s8 : ffffffff88c5a580 s9 : 0000000000007fff s10: 0000000000000000
 s11: ffffffff8a5c6ce0 t3 : 0000000000000001 t4 : fffff5ef027a9409
 t5 : fffff5ef027a940a t6 : 0000000000000002 ssp : 0000000000000000
status: 0000000200000120 badaddr: ffffffff80c81874 cause: 0000000000000003
[<ffffffff80c81874>] page_table_check_set+0x9ca/0xc72 mm/page_table_check.c:118
[<ffffffff80c81fe4>] __page_table_check_ptes_set+0x264/0x47c mm/page_table_check.c:212
[<ffffffff80c0a63e>] page_table_check_ptes_set include/linux/page_table_check.h:83 [inline]
[<ffffffff80c0a63e>] set_ptes arch/riscv/include/asm/pgtable.h:645 [inline]
[<ffffffff80c0a63e>] __split_huge_pmd_locked mm/huge_memory.c:3300 [inline]
[<ffffffff80c0a63e>] split_huge_pmd_locked+0x1eb2/0x23f0 mm/huge_memory.c:3318
[<ffffffff80c0ae26>] __split_huge_pmd+0x2aa/0x3d4 mm/huge_memory.c:3332
[<ffffffff80c0d4a4>] split_huge_pmd_address mm/huge_memory.c:3345 [inline]
[<ffffffff80c0d4a4>] split_huge_pmd_if_needed mm/huge_memory.c:3357 [inline]
[<ffffffff80c0d4a4>] split_huge_pmd_if_needed mm/huge_memory.c:3348 [inline]
[<ffffffff80c0d4a4>] vma_adjust_trans_huge+0x272/0x4b2 mm/huge_memory.c:3369
[<ffffffff80ad89a2>] __split_vma+0x978/0xf0e mm/vma.c:557
[<ffffffff80ad92ec>] vms_gather_munmap_vmas+0x3b4/0x160a mm/vma.c:1448
[<ffffffff80adeede>] __mmap_setup mm/vma.c:2439 [inline]
[<ffffffff80adeede>] __mmap_region+0x3d4/0x283c mm/vma.c:2756
[<ffffffff80ae584a>] mmap_region+0x30c/0x4ec mm/vma.c:2860
[<ffffffff80a6c97c>] do_mmap+0xaea/0x108e mm/mmap.c:560
[<ffffffff809b0dec>] vm_mmap_pgoff+0x27c/0x416 mm/util.c:581
[<ffffffff80a693bc>] ksys_mmap_pgoff+0x74/0x706 mm/mmap.c:606
[<ffffffff80074984>] riscv_sys_mmap arch/riscv/kernel/sys_riscv.c:29 [inline]
[<ffffffff80074984>] __do_sys_mmap arch/riscv/kernel/sys_riscv.c:38 [inline]
[<ffffffff80074984>] __se_sys_mmap arch/riscv/kernel/sys_riscv.c:34 [inline]
[<ffffffff80074984>] __riscv_sys_mmap+0x11c/0x18c arch/riscv/kernel/sys_riscv.c:34
[<ffffffff80078f30>] syscall_handler+0x92/0x114 arch/riscv/include/asm/syscall.h:112
[<ffffffff8651fb84>] do_trap_ecall_u+0x3e4/0x636 arch/riscv/kernel/traps.c:345
[<ffffffff8654beb0>] handle_exception+0x168/0x174 arch/riscv/kernel/entry.S:237
Code: c097 ff8a 80e7 f460 82e3 e404 c097 ff8a 80e7 4440 (9002) c097 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	ff8ac097          	auipc	ra,0xff8ac
   4:	f46080e7          	jalr	-186(ra) # 0xff8abf46
   8:	e40482e3          	beqz	s1,0xfffffffffffffe4c
   c:	ff8ac097          	auipc	ra,0xff8ac
  10:	444080e7          	jalr	1092(ra) # 0xff8ac450
* 14:	9002                	ebreak <-- trapping instruction
  16:	97c0                	.short	0xc097