------------[ cut here ]------------
kernel BUG at [] mm/page_table_check.c:142!
Kernel BUG [#1]
Modules linked in:
CPU: 0 UID: 0 PID: 9661 Comm: syz.2.1520 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 : ffffffff80c4e2ce ra : ffffffff80c4e2ce sp : ffff8f8000207360
 gp : ffffffff8a229d40 tp : ffffaf80194c3500 t0 : ffff8f8000207300
 t1 : fffff5ef027b4809 t2 : 1ffff1f000040eec s0 : ffff8f80002073d0
 s1 : ffffaf8013da4048 a0 : 0000000000000005 a1 : 0000000000000000
 a2 : 0000000000000002 a3 : ffffffff80c4e2ce a4 : 0000000000000000
 a5 : ffffaf80194c4500 a6 : 0000000000000003 a7 : ffffaf8013da404b
 s2 : 0000000000000001 s3 : 0000000000000000 s4 : ffffaf8013da4000
 s5 : dfffffff00000000 s6 : 00000000000bd400 s7 : 0000000000000200
 s8 : 0000000000000009 s9 : 0000000000007fff s10: fffffffef1468db0
 s11: ffffffff8a346d80 t3 : 0000000000000001 t4 : fffff5ef027b4809
 t5 : fffff5ef027b480a t6 : 0000000000000002 ssp : 0000000000000000
status: 0000000200000120 badaddr: ffffffff80c4e2ce cause: 0000000000000003
[<ffffffff80c4e2ce>] __page_table_check_zero+0x396/0x544 mm/page_table_check.c:142
[<ffffffff80ac10c8>] page_table_check_free include/linux/page_table_check.h:46 [inline]
[<ffffffff80ac10c8>] __free_pages_prepare mm/page_alloc.c:1434 [inline]
[<ffffffff80ac10c8>] free_unref_folios+0xa58/0x1ef4 mm/page_alloc.c:3040
[<ffffffff808e5590>] folios_put_refs+0x41c/0x61c mm/swap.c:1002
[<ffffffff80b0d794>] free_pages_and_swap_cache+0x29c/0x480 mm/swap_state.c:426
[<ffffffff80a2d74c>] __tlb_batch_free_encoded_pages+0xe4/0x25c mm/mmu_gather.c:138
[<ffffffff80a302b0>] tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
[<ffffffff80a302b0>] tlb_flush_mmu_free mm/mmu_gather.c:398 [inline]
[<ffffffff80a302b0>] tlb_flush_mmu mm/mmu_gather.c:405 [inline]
[<ffffffff80a302b0>] tlb_finish_mmu+0x188/0x824 mm/mmu_gather.c:530
[<ffffffff80a29e16>] exit_mmap+0x416/0xccc mm/mmap.c:1315
[<ffffffff80140042>] __mmput+0x106/0x3d0 kernel/fork.c:1175
[<ffffffff80140380>] mmput+0x74/0x88 kernel/fork.c:1198
[<ffffffff801607ee>] exit_mm kernel/exit.c:581 [inline]
[<ffffffff801607ee>] do_exit+0x802/0x2ac4 kernel/exit.c:964
[<ffffffff80162f04>] __do_sys_exit kernel/exit.c:1085 [inline]
[<ffffffff80162f04>] __se_sys_exit kernel/exit.c:1083 [inline]
[<ffffffff80162f04>] __riscv_sys_exit+0x48/0x54 kernel/exit.c:1083
[<ffffffff80077f32>] syscall_handler+0x92/0x114 arch/riscv/include/asm/syscall.h:112
[<ffffffff8642f88e>] do_trap_ecall_u+0x402/0x680 arch/riscv/kernel/traps.c:344
[<ffffffff86459c22>] handle_exception+0x15e/0x16a arch/riscv/kernel/entry.S:232
Code: a980 8526 c0ef e7bf 8a2a b791 e097 ff8c 80e7 a860 (9002) e097 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	a980                	fsd	fs0,16(a1)
   2:	8526                	mv	a0,s1
   4:	e7bfc0ef          	jal	0xffffffffffffce7e
   8:	8a2a                	mv	s4,a0
   a:	b791                	j	0xffffffffffffff4e
   c:	ff8ce097          	auipc	ra,0xff8ce
  10:	a86080e7          	jalr	-1402(ra) # 0xff8cda92
* 14:	9002                	ebreak <-- trapping instruction
  16:	97e0                	.short	0xe097