------------[ cut here ]------------
kernel BUG at [] mm/page_table_check.c:142!
Kernel BUG [#1]
Modules linked in:
CPU: 0 UID: 0 PID: 37 Comm: khugepaged Not tainted syzkaller #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
epc : __page_table_check_zero+0x370/0x532 mm/page_table_check.c:142
 ra : __page_table_check_zero+0x370/0x532 mm/page_table_check.c:142
epc : ffffffff80cbe304 ra : ffffffff80cbe304 sp : ffff8f80002b7350
 gp : ffffffff8a6d9c00 tp : ffffaf8015ad3580 t0 : ffff8f80002b7300
 t1 : fffff5ef02834809 t2 : ffffffff9191b3a0 s0 : ffff8f80002b73c0
 s1 : ffffaf80141a4048 a0 : 0000000000000005 a1 : 0000000000000000
 a2 : 0000000000000002 a3 : ffffffff80cbe304 a4 : 0000000000000000
 a5 : ffffaf8015ad4580 a6 : 0000000000000003 a7 : ffffaf80141a404b
 s2 : 0000000000000001 s3 : 0000000000000000 s4 : ffffaf80141a4000
 s5 : dfffffff00000000 s6 : 0000000000000200 s7 : 00000000000bd400
 s8 : ffffffff88e6d260 s9 : 0000000000007fff s10: fffffffef14ff3ac
 s11: ffffffff8a7f9d60 t3 : 00000000000000c8 t4 : fffff5ef02834809
 t5 : fffff5ef0283480a t6 : 0000000000000002 ssp : 0000000000000000
status: 0000000200000120 badaddr: ffffffff80cbe304 cause: 0000000000000003
[<ffffffff80cbe304>] __page_table_check_zero+0x370/0x532 mm/page_table_check.c:142
[<ffffffff80b2dfe6>] page_table_check_free include/linux/page_table_check.h:46 [inline]
[<ffffffff80b2dfe6>] __free_pages_prepare mm/page_alloc.c:1419 [inline]
[<ffffffff80b2dfe6>] __free_frozen_pages+0x6e4/0x13a2 mm/page_alloc.c:2962
[<ffffffff80b368bc>] free_frozen_pages+0xe/0x16 mm/page_alloc.c:2999
[<ffffffff80958c82>] __folio_put+0x29c/0x456 mm/folio.c:105
[<ffffffff809a06fe>] folio_put include/linux/mm.h:2160 [inline]
[<ffffffff809a06fe>] folio_putback_lru+0xb8/0xde mm/vmscan.c:824
[<ffffffff80c64522>] __collapse_huge_page_copy_succeeded mm/khugepaged.c:903 [inline]
[<ffffffff80c64522>] __collapse_huge_page_copy mm/khugepaged.c:975 [inline]
[<ffffffff80c64522>] collapse_huge_page+0x2524/0x449a mm/khugepaged.c:1421
[<ffffffff80c6af32>] mthp_collapse mm/khugepaged.c:1532 [inline]
[<ffffffff80c6af32>] collapse_scan_pmd mm/khugepaged.c:1781 [inline]
[<ffffffff80c6af32>] collapse_single_pmd+0x3926/0x4a28 mm/khugepaged.c:2797
[<ffffffff80c6d0c8>] collapse_scan_mm_slot mm/khugepaged.c:2912 [inline]
[<ffffffff80c6d0c8>] khugepaged_do_scan mm/khugepaged.c:2992 [inline]
[<ffffffff80c6d0c8>] khugepaged+0x1094/0x1786 mm/khugepaged.c:3047
[<ffffffff801ff0f8>] kthread+0x312/0x438 kernel/kthread.c:436
[<ffffffff8006d344>] ret_from_fork_kernel+0x94/0xe76 arch/riscv/kernel/process.c:230
[<ffffffff8663b352>] ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:368
Code: e0a0 854a c0ef ff6f 8a2a bf9d 2097 ff88 80e7 df80 (9002) 2097 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	e0a0                	fsw	fs0,64(s1)
   2:	854a                	mv	a0,s2
   4:	ff6fc0ef          	jal	0xffffffffffffc7fa
   8:	8a2a                	mv	s4,a0
   a:	bf9d                	j	0xffffffffffffff80
   c:	ff882097          	auipc	ra,0xff882
  10:	df8080e7          	jalr	-520(ra) # 0xff881e04
* 14:	9002                	ebreak <-- trapping instruction
  16:	9720                	.short	0x2097