------------[ cut here ]------------
kernel BUG at [] mm/page_table_check.c:142!
Kernel BUG [#1]
Modules linked in:
CPU: 0 UID: 0 PID: 6268 Comm: syz.1.687 Not tainted syzkaller #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
epc : __page_table_check_zero+0x396/0x544 mm/page_table_check.c:142
 ra : __page_table_check_zero+0x396/0x544 mm/page_table_check.c:142
epc : ffffffff80c4e452 ra : ffffffff80c4e452 sp : ffff8f80037f7240
 gp : ffffffff8a22a0c0 tp : ffffaf801cafcf80 t0 : ffff8f80037f71e0
 t1 : fffff5ef0283fc09 t2 : fffffffffc1fffff s0 : ffff8f80037f72b0
 s1 : ffffaf80141fe048 a0 : 0000000000000005 a1 : 0000000000000000
 a2 : 0000000000080000 a3 : ffffffff80c4e452 a4 : ffff8f8004bfa000
 a5 : 0000000000080000 a6 : 0000000000000003 a7 : ffffaf80141fe04b
 s2 : 0000000000000001 s3 : 0000000000000000 s4 : ffffaf80141fe000
 s5 : dfffffff00000000 s6 : 00000000000c6600 s7 : 0000000000000200
 s8 : 0000000000000009 s9 : 0000000000007fff s10: fffffffef1468fb0
 s11: ffffffff8a347d80 t3 : 0000000000000001 t4 : fffff5ef0283fc09
 t5 : fffff5ef0283fc0a t6 : 1ffffffff22c0304 ssp : 0000000000000000
status: 0000000200000120 badaddr: ffffffff80c4e452 cause: 0000000000000003
[<ffffffff80c4e452>] __page_table_check_zero+0x396/0x544 mm/page_table_check.c:142
[<ffffffff80ab6b4c>] page_table_check_free include/linux/page_table_check.h:46 [inline]
[<ffffffff80ab6b4c>] __free_pages_prepare mm/page_alloc.c:1434 [inline]
[<ffffffff80ab6b4c>] __free_frozen_pages+0x82c/0x14c4 mm/page_alloc.c:2978
[<ffffffff80ac07d2>] free_frozen_pages+0xe/0x18 mm/page_alloc.c:3016
[<ffffffff808e5db6>] __folio_put+0x296/0x378 mm/swap.c:112
[<ffffffff80ba8098>] folio_put include/linux/mm.h:1817 [inline]
[<ffffffff80ba8098>] migrate_folio_done+0x210/0x264 mm/migrate.c:1199
[<ffffffff80bb0fd4>] migrate_folio_move mm/migrate.c:1413 [inline]
[<ffffffff80bb0fd4>] migrate_folios_move mm/migrate.c:1721 [inline]
[<ffffffff80bb0fd4>] migrate_pages_batch+0x1c68/0x3500 mm/migrate.c:1977
[<ffffffff80bb2964>] migrate_pages_sync+0xf8/0x6d0 mm/migrate.c:2007
[<ffffffff80bb8300>] migrate_pages+0x1f10/0x28c4 mm/migrate.c:2116
[<ffffffff80b73164>] do_mbind+0x698/0xe08 mm/mempolicy.c:1608
[<ffffffff80b73be0>] kernel_mbind mm/mempolicy.c:1751 [inline]
[<ffffffff80b73be0>] __do_sys_mbind mm/mempolicy.c:1825 [inline]
[<ffffffff80b73be0>] __se_sys_mbind mm/mempolicy.c:1821 [inline]
[<ffffffff80b73be0>] __riscv_sys_mbind+0x30c/0x3a0 mm/mempolicy.c:1821
[<ffffffff80077f1e>] syscall_handler+0x92/0x114 arch/riscv/include/asm/syscall.h:112
[<ffffffff8642fdbe>] do_trap_ecall_u+0x402/0x680 arch/riscv/kernel/traps.c:342
[<ffffffff8645a152>] handle_exception+0x15e/0x16a arch/riscv/kernel/entry.S:232
Code: 4b00 8526 c0ef e7bf 8a2a b791 d097 ff8c 80e7 49e0 (9002) d097 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	4b00                	lw	s0,16(a4)
   2:	8526                	mv	a0,s1
   4:	e7bfc0ef          	jal	0xffffffffffffce7e
   8:	8a2a                	mv	s4,a0
   a:	b791                	j	0xffffffffffffff4e
   c:	ff8cd097          	auipc	ra,0xff8cd
  10:	49e080e7          	jalr	1182(ra) # 0xff8cd4aa
* 14:	9002                	ebreak <-- trapping instruction
  16:	97d0                	.short	0xd097