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kernel BUG at [] mm/page_table_check.c:142!
Kernel BUG [#1]
Modules linked in:
CPU: 0 UID: 0 PID: 4402 Comm: syz.2.54 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 : ffff8f8009d36ab0
 gp : ffffffff8a6d9c00 tp : ffffaf801c0fd040 t0 : ffff8f8009d36a60
 t1 : fffff5ef027c6009 t2 : ffffffff9191b3a0 s0 : ffff8f8009d36b20
 s1 : ffffaf8013e30048 a0 : 0000000000000005 a1 : 0000000000000000
 a2 : 0000000000000002 a3 : ffffffff80cbe304 a4 : 0000000000000000
 a5 : ffffaf801c0fe040 a6 : 0000000000000003 a7 : ffffaf8013e3004b
 s2 : 0000000000000001 s3 : 0000000000000000 s4 : ffffaf8013e30000
 s5 : dfffffff00000000 s6 : 0000000000000200 s7 : 00000000000b7000
 s8 : ffffffff88e6d260 s9 : 0000000000007fff s10: fffffffef14ff3ac
 s11: ffffffff8a7f9d60 t3 : 00000000000000c8 t4 : fffff5ef027c6009
 t5 : fffff5ef027c600a t6 : 0000000000000002 ssp : 0000000000000000
status: 0000000200000120 badaddr: ffffffff80cbe304 cause: 0000000000000003
[<ffffffff80cbe304>] __page_table_check_zero+0x370/0x532 mm/page_table_check.c:142
[<ffffffff80b37444>] page_table_check_free include/linux/page_table_check.h:46 [inline]
[<ffffffff80b37444>] __free_pages_prepare mm/page_alloc.c:1419 [inline]
[<ffffffff80b37444>] free_unref_folios+0xb6a/0x1c5c mm/page_alloc.c:3022
[<ffffffff8095aff0>] folios_put_refs+0x46c/0x7c6 mm/folio.c:1034
[<ffffffff80b88c84>] free_pages_and_swap_cache+0x278/0x3be mm/swap_state.c:595
[<ffffffff80aa1930>] __tlb_batch_free_encoded_pages+0xe2/0x25a mm/mmu_gather.c:138
[<ffffffff80aa3360>] tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
[<ffffffff80aa3360>] tlb_flush_mmu_free mm/mmu_gather.c:417 [inline]
[<ffffffff80aa3360>] tlb_flush_mmu+0xdc/0x5f8 mm/mmu_gather.c:424
[<ffffffff80a62c04>] zap_pte_range mm/memory.c:2104 [inline]
[<ffffffff80a62c04>] zap_pmd_range mm/memory.c:2151 [inline]
[<ffffffff80a62c04>] zap_pud_range mm/memory.c:2179 [inline]
[<ffffffff80a62c04>] zap_p4d_range mm/memory.c:2200 [inline]
[<ffffffff80a62c04>] __zap_vma_range+0x13f2/0x456a mm/memory.c:2240
[<ffffffff80a673f8>] unmap_vmas+0x244/0x518 mm/memory.c:2309
[<ffffffff80a9de16>] exit_mmap+0x1f8/0xc9e mm/mmap.c:1315
[<ffffffff8014db66>] __mmput+0x106/0x3d0 kernel/fork.c:1193
[<ffffffff8014dea4>] mmput+0x74/0x88 kernel/fork.c:1216
[<ffffffff80170ab6>] exit_mm kernel/exit.c:617 [inline]
[<ffffffff80170ab6>] do_exit+0x80c/0x297c kernel/exit.c:999
[<ffffffff80173152>] do_group_exit+0xca/0x258 kernel/exit.c:1154
[<ffffffff801ac8a2>] get_signal+0x1f58/0x2224 kernel/signal.c:3051
[<ffffffff8007600c>] arch_do_signal_or_restart+0x648/0x1df6 arch/riscv/kernel/signal.c:534
[<ffffffff803e78ce>] __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
[<ffffffff803e78ce>] exit_to_user_mode_loop+0x92/0xce8 kernel/entry/common.c:101
[<ffffffff8660e964>] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
[<ffffffff8660e964>] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
[<ffffffff8660e964>] syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
[<ffffffff8660e964>] do_trap_ecall_u+0x52c/0x658 arch/riscv/kernel/traps.c:344
[<ffffffff8663b218>] handle_exception+0x168/0x174 arch/riscv/kernel/entry.S:237
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