loop6: detected capacity change from 0 to 512
==================================================================
BUG: KASAN: slab-out-of-bounds in check_igot_inode fs/ext4/inode.c:-1 [inline]
BUG: KASAN: slab-out-of-bounds in __ext4_iget+0x2b8/0x3d80 fs/ext4/inode.c:4704
Read of size 8 at addr ffff8881350e7ef8 by task syz.6.6874/23425

CPU: 0 PID: 23425 Comm: syz.6.6874 Not tainted 5.15.189-syzkaller-android13-5.15.189_r00 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0xf1/0x140 mm/kasan/report.c:444
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
 check_igot_inode fs/ext4/inode.c:-1 [inline]
 __ext4_iget+0x2b8/0x3d80 fs/ext4/inode.c:4704
 ext4_quota_enable fs/ext4/super.c:6406 [inline]
 ext4_enable_quotas+0x33b/0x6d0 fs/ext4/super.c:6442
 ext4_fill_super+0x8761/0x9030 fs/ext4/super.c:4949
 mount_bdev+0x2ae/0x3e0 fs/super.c:1400
 ext4_mount+0x34/0x40 fs/ext4/super.c:6621
 legacy_get_tree+0xed/0x190 fs/fs_context.c:611
 vfs_get_tree+0x89/0x260 fs/super.c:1530
 do_new_mount+0x25a/0xa20 fs/namespace.c:3014
 path_mount+0x675/0x1020 fs/namespace.c:3344
 do_mount fs/namespace.c:3357 [inline]
 __do_sys_mount fs/namespace.c:3565 [inline]
 __se_sys_mount+0x318/0x380 fs/namespace.c:3542
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3542
 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f69d0b9238a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69cf5b6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f69cf5b6ef0 RCX: 00007f69d0b9238a
RDX: 0000200000000180 RSI: 0000200000000000 RDI: 00007f69cf5b6eb0
RBP: 0000200000000180 R08: 00007f69cf5b6ef0 R09: 000000000021081e
R10: 000000000021081e R11: 0000000000000246 R12: 0000200000000000
R13: 00007f69cf5b6eb0 R14: 00000000000004fa R15: 00002000000001c0
 </TASK>

Allocated by task 12236:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 __kasan_slab_alloc+0xbd/0xf0 mm/kasan/common.c:466
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3240 [inline]
 slab_alloc mm/slub.c:3250 [inline]
 kmem_cache_alloc+0xf7/0x260 mm/slub.c:3255
 kmem_cache_zalloc include/linux/slab.h:737 [inline]
 alloc_buffer_head+0x26/0x120 fs/buffer.c:3311
 alloc_page_buffers+0x16d/0x370 fs/buffer.c:832
 grow_dev_page fs/buffer.c:968 [inline]
 grow_buffers fs/buffer.c:1014 [inline]
 __getblk_slow fs/buffer.c:1041 [inline]
 __getblk_gfp+0x3ee/0x7d0 fs/buffer.c:1336
 sb_getblk include/linux/buffer_head.h:361 [inline]
 __ext4_get_inode_loc+0x461/0xcd0 fs/ext4/inode.c:4357
 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4465 [inline]
 __ext4_iget+0x44a/0x3d80 fs/ext4/inode.c:4715
 ext4_orphan_get+0x1e4/0x630 fs/ext4/ialloc.c:1401
 ext4_orphan_cleanup+0x884/0x10c0 fs/ext4/orphan.c:467
 ext4_fill_super+0x8912/0x9030 fs/ext4/super.c:4964
 mount_bdev+0x2ae/0x3e0 fs/super.c:1400
 ext4_mount+0x34/0x40 fs/ext4/super.c:6621
 legacy_get_tree+0xed/0x190 fs/fs_context.c:611
 vfs_get_tree+0x89/0x260 fs/super.c:1530
 do_new_mount+0x25a/0xa20 fs/namespace.c:3014
 path_mount+0x675/0x1020 fs/namespace.c:3344
 do_mount fs/namespace.c:3357 [inline]
 __do_sys_mount fs/namespace.c:3565 [inline]
 __se_sys_mount+0x318/0x380 fs/namespace.c:3542
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3542
 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff8881350e7e70
 which belongs to the cache buffer_head of size 104
The buggy address is located 32 bytes to the right of
 104-byte region [ffff8881350e7e70, ffff8881350e7ed8)
The buggy address belongs to the page:
page:ffffea0004d439c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1350e7
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 dead000000000100 dead000000000122 ffff8881001c5080
raw: 0000000000000000 0000000000180018 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x112c50(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 1311, ts 109428347134, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485
 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5795
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1932 [inline]
 new_slab+0xa1/0x4d0 mm/slub.c:1995
 ___slab_alloc+0x381/0x810 mm/slub.c:3028
 __slab_alloc+0x49/0x90 mm/slub.c:3115
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3250 [inline]
 kmem_cache_alloc+0x138/0x260 mm/slub.c:3255
 kmem_cache_zalloc include/linux/slab.h:737 [inline]
 alloc_buffer_head+0x26/0x120 fs/buffer.c:3311
 alloc_page_buffers+0x16d/0x370 fs/buffer.c:832
 create_empty_buffers+0x3d/0x4c0 fs/buffer.c:1562
 create_page_buffers+0x149/0x220 fs/buffer.c:1679
 __block_write_begin_int+0x1c1/0x14b0 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2062 [inline]
 block_write_begin fs/buffer.c:2122 [inline]
 cont_write_begin+0x58a/0x7b0 fs/buffer.c:2471
 fat_write_begin+0xa0/0x180 fs/fat/inode.c:235
 generic_perform_write+0x2ad/0x670 mm/filemap.c:3869
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8881350e7d80: fb fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00
 ffff8881350e7e00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 00
>ffff8881350e7e80: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
                                                                ^
 ffff8881350e7f00: fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881350e7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
EXT4-fs warning (device loop6): ext4_enable_quotas:6450: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix.
EXT4-fs (loop6): mount failed