------------[ cut here ]------------
pte_uffd_wp(pte) && pte_write(pte)
WARNING: mm/page_table_check.c:194 at page_table_check_pte_flags mm/page_table_check.c:194 [inline], CPU#2: syz.1.4931/22131
WARNING: mm/page_table_check.c:194 at __page_table_check_ptes_set+0x233/0x4e0 mm/page_table_check.c:210, CPU#2: syz.1.4931/22131
Modules linked in:
CPU: 2 UID: 0 PID: 22131 Comm: syz.1.4931 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:page_table_check_pte_flags mm/page_table_check.c:194 [inline]
RIP: 0010:__page_table_check_ptes_set+0x233/0x4e0 mm/page_table_check.c:210
Code: 84 e5 fe ff ff e8 4d ce 87 ff 48 8b 2c 24 31 ff 83 e5 02 48 89 ee e8 1c c9 87 ff 48 85 ed 0f 84 2d 02 00 00 e8 2e ce 87 ff 90 <0f> 0b 90 e9 b8 fe ff ff e8 20 ce 87 ff 48 8b 2c 24 31 ff bb 01 00
RSP: 0000:ffffc9000601e9d0 EFLAGS: 00010246
RAX: 0000000000080000 RBX: ffff88806c03e448 RCX: ffffc9002eb10000
RDX: 0000000000080000 RSI: ffffffff828029b2 RDI: ffff88805e8f8000
RBP: 0000000000000002 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000001 R14: 1ffff92000c03d4f R15: 1ffff92000c03d3c
FS:  0000000000000000(0000) GS:ffff88809735a000(0063) knlGS:00000000f5406b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f72f5ae8 CR3: 00000000795fe000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 page_table_check_ptes_set include/linux/page_table_check.h:83 [inline]
 set_ptes+0x199/0x1d0 include/linux/pgtable.h:432
 do_swap_page+0x2e58/0x68e0 mm/memory.c:5046
 handle_pte_fault mm/memory.c:6311 [inline]
 __handle_mm_fault+0x18c1/0x2b60 mm/memory.c:6446
 handle_mm_fault+0x36d/0xa20 mm/memory.c:6615
 faultin_page mm/gup.c:1126 [inline]
 __get_user_pages+0xf9c/0x34d0 mm/gup.c:1428
 __get_user_pages_locked mm/gup.c:1692 [inline]
 get_dump_page+0x27e/0x3d0 mm/gup.c:2192
 dump_user_range+0x18d/0xb50 fs/coredump.c:1367
 elf_core_dump+0x31b0/0x4250 fs/binfmt_elf.c:2111
 coredump_write fs/coredump.c:1050 [inline]
 do_coredump fs/coredump.c:1127 [inline]
 vfs_coredump+0x27b4/0x5570 fs/coredump.c:1201
 get_signal+0x1f2a/0x21e0 kernel/signal.c:3019
 arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x4a0 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
 __do_fast_syscall_32+0x578/0x8c0 arch/x86/entry/syscall_32.c:310
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f45f6c
Code: d2 74 05 c1 e8 0c 89 02 8b 5d fc 31 c0 c9 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 58 b8 77 00 00 00 cd 80 0f 0b 8d b6 00 00 00 00 b8 ad
RSP: 002b:00000000f54065cc EFLAGS: 00000246 ORIG_RAX: 00000000000000f0
RAX: ffffffffffffffda RBX: 00000000f7404f8c RCX: 0000000000000081
RDX: 00000000000f4240 RSI: 0000000020646165 RDI: 0000000063617473
RBP: 0000000000203a6b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	d2 74 05 c1          	shlb   %cl,-0x3f(%rbp,%rax,1)
   4:	e8 0c 89 02 8b       	call   0x8b028915
   9:	5d                   	pop    %rbp
   a:	fc                   	cld
   b:	31 c0                	xor    %eax,%eax
   d:	c9                   	leave
   e:	c3                   	ret
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	0f 1f 00             	nopl   (%rax)
  21:	51                   	push   %rcx
  22:	52                   	push   %rdx
  23:	55                   	push   %rbp
  24:	89 e5                	mov    %esp,%ebp
  26:	0f 34                	sysenter
  28:	cd 80                	int    $0x80
* 2a:	5d                   	pop    %rbp <-- trapping instruction
  2b:	5a                   	pop    %rdx
  2c:	59                   	pop    %rcx
  2d:	c3                   	ret
  2e:	58                   	pop    %rax
  2f:	b8 77 00 00 00       	mov    $0x77,%eax
  34:	cd 80                	int    $0x80
  36:	0f 0b                	ud2
  38:	8d b6 00 00 00 00    	lea    0x0(%rsi),%esi
  3e:	b8                   	.byte 0xb8
  3f:	ad                   	lods   %ds:(%rsi),%eax