==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: null-ptr-deref in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
BUG: KASAN: null-ptr-deref in page_ref_count include/linux/page_ref.h:67 [inline]
BUG: KASAN: null-ptr-deref in put_page_testzero include/linux/mm.h:996 [inline]
BUG: KASAN: null-ptr-deref in folio_put_testzero include/linux/mm.h:1002 [inline]
BUG: KASAN: null-ptr-deref in folio_put include/linux/mm.h:1429 [inline]
BUG: KASAN: null-ptr-deref in filemap_fault+0x544/0x24a0 mm/filemap.c:3382
Read of size 4 at addr 0000000000000032 by task syz-executor.1/7528

CPU: 2 PID: 7528 Comm: syz-executor.1 Not tainted 6.3.0-syzkaller-12570-g7df047b3f0aa #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 print_report mm/kasan/report.c:465 [inline]
 kasan_report+0xec/0x130 mm/kasan/report.c:572
 check_region_inline mm/kasan/generic.c:181 [inline]
 kasan_check_range+0x141/0x190 mm/kasan/generic.c:187
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
 page_ref_count include/linux/page_ref.h:67 [inline]
 put_page_testzero include/linux/mm.h:996 [inline]
 folio_put_testzero include/linux/mm.h:1002 [inline]
 folio_put include/linux/mm.h:1429 [inline]
 filemap_fault+0x544/0x24a0 mm/filemap.c:3382
 __do_fault+0x107/0x600 mm/memory.c:4176
 do_shared_fault mm/memory.c:4585 [inline]
 do_fault mm/memory.c:4663 [inline]
 do_pte_missing mm/memory.c:3647 [inline]
 handle_pte_fault mm/memory.c:4947 [inline]
 __handle_mm_fault+0x24c9/0x41c0 mm/memory.c:5089
 handle_mm_fault+0x2af/0x9f0 mm/memory.c:5243
 do_user_addr_fault+0x51a/0x1210 arch/x86/mm/fault.c:1440
 handle_page_fault arch/x86/mm/fault.c:1534 [inline]
 exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1590
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0023:0xf721b88b
Code: d0 74 1f 89 d0 83 f0 01 09 c8 0f 85 c5 fe ff ff 8b 44 24 20 c7 44 24 24 00 00 00 00 0f c8 89 44 24 20 8b 44 24 1c 8b 74 24 20 <89> 30 e9 07 fb ff ff 0f b6 4c 24 10 8b 5c 24 28 89 cf c1 ef 05 83
RSP: 002b:00000000ff9a5400 EFLAGS: 00010246
RAX: 00000000200000c0 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000038 RDI: 0000000000000000
RBP: 00000000ff9a55ac R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
==================================================================
----------------
Code disassembly (best guess):
   0:	d0 74 1f 89          	shlb   -0x77(%rdi,%rbx,1)
   4:	d0 83 f0 01 09 c8    	rolb   -0x37f6fe10(%rbx)
   a:	0f 85 c5 fe ff ff    	jne    0xfffffed5
  10:	8b 44 24 20          	mov    0x20(%rsp),%eax
  14:	c7 44 24 24 00 00 00 	movl   $0x0,0x24(%rsp)
  1b:	00
  1c:	0f c8                	bswap  %eax
  1e:	89 44 24 20          	mov    %eax,0x20(%rsp)
  22:	8b 44 24 1c          	mov    0x1c(%rsp),%eax
  26:	8b 74 24 20          	mov    0x20(%rsp),%esi
* 2a:	89 30                	mov    %esi,(%rax) <-- trapping instruction
  2c:	e9 07 fb ff ff       	jmpq   0xfffffb38
  31:	0f b6 4c 24 10       	movzbl 0x10(%rsp),%ecx
  36:	8b 5c 24 28          	mov    0x28(%rsp),%ebx
  3a:	89 cf                	mov    %ecx,%edi
  3c:	c1 ef 05             	shr    $0x5,%edi
  3f:	83                   	.byte 0x83