loop1: detected capacity change from 0 to 512
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BUG: KASAN: slab-out-of-bounds in shrink_folio_list+0x141d/0x37d0
Read of size 8 at addr ffff888015d1ca71 by task syz-executor.7/4061

CPU: 1 PID: 4061 Comm: syz-executor.7 Not tainted 6.4.0-next-20230705 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x91/0xf0
 print_report+0xcc/0x620
 kasan_report+0xbe/0xf0
 kasan_check_range+0x39/0x1b0
 shrink_folio_list+0x141d/0x37d0
 reclaim_folio_list+0xc4/0x300
 reclaim_pages+0x377/0x520
 madvise_cold_or_pageout_pte_range+0xc9c/0xf90
 walk_pgd_range+0xcc3/0x1740
 __walk_page_range+0x5f6/0x720
 walk_page_range+0x316/0x4b0
 madvise_pageout+0x30b/0x580
 madvise_vma_behavior+0x413/0x20a0
 do_madvise.part.0+0x39a/0x650
 __x64_sys_madvise+0x10c/0x160
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x6e/0xd8
RIP: 0033:0x7f8118281b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f81157f7188 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f8118394f60 RCX: 00007f8118281b19
RDX: 0000000000000015 RSI: 0000000000004000 RDI: 0000000020ffa000
RBP: 00007f81182dbf6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe57b9b64f R14: 00007f81157f7300 R15: 0000000000022000
 </TASK>

Allocated by task 3835:
 kasan_save_stack+0x22/0x50
 kasan_set_track+0x25/0x30
 __kasan_slab_alloc+0x59/0x70
 kmem_cache_alloc+0x16b/0x370
 anon_vma_fork+0xe6/0x630
 dup_mmap+0xaf9/0x1250
 copy_process+0x3e68/0x7320
 kernel_clone+0xeb/0x7d0
 __do_sys_fork+0x80/0xc0
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x6e/0xd8

The buggy address belongs to the object at ffff888015d1c990
 which belongs to the cache anon_vma of size 208
The buggy address is located 17 bytes to the right of
 allocated 208-byte region [ffff888015d1c990, ffff888015d1ca60)

The buggy address belongs to the physical page:
page:00000000bbc22d6d refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x15d1c
memcg:ffff88800e445401
flags: 0x100000000000200(slab|node=0|zone=1)
page_type: 0xffffffff()
raw: 0100000000000200 ffff8880087a2280 dead000000000100 dead000000000122
raw: 0000000000000000 00000000000f000f 00000001ffffffff ffff88800e445401
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888015d1c900: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
 ffff888015d1c980: fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888015d1ca00: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
                                                             ^
 ffff888015d1ca80: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888015d1cb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
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