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kernel BUG at [] mm/page_table_check.c:142!
Kernel BUG [#1]
Modules linked in:
CPU: 0 UID: 0 PID: 5067 Comm: syz.0.366 Tainted: G        W           syzkaller #0 PREEMPT 
Tainted: [W]=WARN
Hardware name: riscv-virtio,qemu (DT)
epc : __page_table_check_zero+0x386/0x534 mm/page_table_check.c:142
 ra : __page_table_check_zero+0x386/0x534 mm/page_table_check.c:142
epc : ffffffff80c6a8b6 ra : ffffffff80c6a8b6 sp : ffff8f800a0a6fa0
 gp : ffffffff8a24e5c0 tp : ffffaf801b6d0000 t0 : ffff8f800a0a6f40
 t1 : fffff5ef02738409 t2 : ffffffff91627f80 s0 : ffff8f800a0a7010
 s1 : ffffaf80139c2048 a0 : 0000000000000005 a1 : 0000000000000000
 a2 : 0000000000000002 a3 : ffffffff80c6a8b6 a4 : 0000000000000000
 a5 : ffffaf801b6d1000 a6 : 0000000000000003 a7 : ffffaf80139c204b
 s2 : 0000000000000001 s3 : 0000000000000000 s4 : ffffaf80139c2000
 s5 : dfffffff00000000 s6 : 00000000000b5a00 s7 : 0000000000000200
 s8 : 0000000000000009 s9 : 0000000000007fff s10: fffffffef146d78c
 s11: ffffffff8a36bc60 t3 : 0000000000000001 t4 : fffff5ef02738409
 t5 : fffff5ef0273840a t6 : 0000000000000002 ssp : 0000000000000000
status: 0000000200000120 badaddr: ffffffff80c6a8b6 cause: 0000000000000003
[<ffffffff80c6a8b6>] __page_table_check_zero+0x386/0x534 mm/page_table_check.c:142
[<ffffffff80ae7672>] page_table_check_free include/linux/page_table_check.h:46 [inline]
[<ffffffff80ae7672>] __free_pages_prepare mm/page_alloc.c:1403 [inline]
[<ffffffff80ae7672>] free_unref_folios+0xb1e/0x1ad0 mm/page_alloc.c:3004
[<ffffffff80914374>] folios_put_refs+0x458/0x7c8 mm/swap.c:1008
[<ffffffff80b33b42>] free_pages_and_swap_cache+0x22e/0x3c0 mm/swap_state.c:401
[<ffffffff80a59ce0>] __tlb_batch_free_encoded_pages+0xe4/0x25c mm/mmu_gather.c:138
[<ffffffff80a5c864>] tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
[<ffffffff80a5c864>] tlb_flush_mmu_free mm/mmu_gather.c:417 [inline]
[<ffffffff80a5c864>] tlb_flush_mmu mm/mmu_gather.c:424 [inline]
[<ffffffff80a5c864>] tlb_finish_mmu+0x188/0x824 mm/mmu_gather.c:549
[<ffffffff80a56262>] exit_mmap+0x416/0xcc0 mm/mmap.c:1313
[<ffffffff80141ed6>] __mmput+0x106/0x3d0 kernel/fork.c:1178
[<ffffffff80142214>] mmput+0x74/0x88 kernel/fork.c:1201
[<ffffffff80162c26>] exit_mm kernel/exit.c:582 [inline]
[<ffffffff80162c26>] do_exit+0x876/0x2a18 kernel/exit.c:964
[<ffffffff801652f6>] do_group_exit+0xca/0x258 kernel/exit.c:1119
[<ffffffff8019efb2>] get_signal+0x1f56/0x2224 kernel/signal.c:3037
[<ffffffff80072924>] arch_do_signal_or_restart+0xf4/0x1e08 arch/riscv/kernel/signal.c:534
[<ffffffff86483ca4>] __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
[<ffffffff86483ca4>] exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
[<ffffffff86483ca4>] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
[<ffffffff86483ca4>] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline]
[<ffffffff86483ca4>] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline]
[<ffffffff86483ca4>] irqentry_exit+0x6a0/0xe8c kernel/entry/common.c:162
[<ffffffff8648279e>] do_page_fault+0x3e/0x58 arch/riscv/kernel/traps.c:420
[<ffffffff864ad412>] handle_exception+0x15e/0x16a arch/riscv/kernel/entry.S:232
Code: f580 8526 d0ef 88af 8a2a b7a1 7097 ff8c 80e7 f460 (9002) 7097 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	f580                	fsw	fs0,40(a1)
   2:	8526                	mv	a0,s1
   4:	88afd0ef          	jal	0xffffffffffffd08e
   8:	8a2a                	mv	s4,a0
   a:	b7a1                	j	0xffffffffffffff52
   c:	ff8c7097          	auipc	ra,0xff8c7
  10:	f46080e7          	jalr	-186(ra) # 0xff8c6f52
* 14:	9002                	ebreak <-- trapping instruction
  16:	9770                	.short	0x7097