loop3: detected capacity change from 0 to 2048
==================================================================
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+0x2c0/0x3f40 fs/ext4/inode.c:4843
Read of size 8 at addr ffff88805d5c7f30 by task syz.3.15218/7681

CPU: 1 PID: 7681 Comm: syz.3.15218 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:468
 kasan_report+0x117/0x150 mm/kasan/report.c:581
 check_igot_inode fs/ext4/inode.c:-1 [inline]
 __ext4_iget+0x2c0/0x3f40 fs/ext4/inode.c:4843
 __ext4_fill_super fs/ext4/super.c:5513 [inline]
 ext4_fill_super+0x5020/0x6790 fs/ext4/super.c:5740
 get_tree_bdev+0x3f3/0x520 fs/super.c:1591
 vfs_get_tree+0x8c/0x280 fs/super.c:1764
 do_new_mount+0x24b/0xa40 fs/namespace.c:3386
 do_mount fs/namespace.c:3726 [inline]
 __do_sys_mount fs/namespace.c:3935 [inline]
 __se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f6618b9da0a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f66199fbe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f66199fbee0 RCX: 00007f6618b9da0a
RDX: 0000200000000080 RSI: 00002000000007c0 RDI: 00007f66199fbea0
RBP: 0000200000000080 R08: 00007f66199fbee0 R09: 0000000000000480
R10: 0000000000000480 R11: 0000000000000246 R12: 00002000000007c0
R13: 00007f66199fbea0 R14: 000000000000076c R15: 0000200000000000
 </TASK>

Allocated by task 13305:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767
 slab_alloc_node mm/slub.c:3495 [inline]
 slab_alloc mm/slub.c:3503 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
 kmem_cache_alloc+0x11a/0x2d0 mm/slub.c:3519
 kmem_cache_zalloc include/linux/slab.h:711 [inline]
 alloc_buffer_head+0x2d/0x280 fs/buffer.c:3031
 folio_alloc_buffers+0x39b/0x980 fs/buffer.c:935
 folio_create_empty_buffers+0x3a/0x720 fs/buffer.c:1648
 ntfs_read_block fs/ntfs/aops.c:192 [inline]
 ntfs_read_folio+0xe1f/0x2990 fs/ntfs/aops.c:436
 filemap_read_folio+0x172/0x760 mm/filemap.c:2420
 do_read_cache_folio+0x468/0x7d0 mm/filemap.c:3804
 do_read_cache_page+0x32/0x250 mm/filemap.c:3870
 read_mapping_page include/linux/pagemap.h:892 [inline]
 ntfs_map_page fs/ntfs/aops.h:75 [inline]
 ntfs_check_logfile+0x28c/0x2740 fs/ntfs/logfile.c:532
 load_and_check_logfile+0x6f/0xd0 fs/ntfs/super.c:1223
 load_system_files+0x2f1b/0x4550 fs/ntfs/super.c:1949
 ntfs_fill_super+0x1818/0x2a50 fs/ntfs/super.c:2900
 mount_bdev+0x221/0x2d0 fs/super.c:1643
 legacy_get_tree+0xea/0x180 fs/fs_context.c:662
 vfs_get_tree+0x8c/0x280 fs/super.c:1764
 do_new_mount+0x24b/0xa40 fs/namespace.c:3386
 do_mount fs/namespace.c:3726 [inline]
 __do_sys_mount fs/namespace.c:3935 [inline]
 __se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff88805d5c7e80
 which belongs to the cache buffer_head of size 168
The buggy address is located 8 bytes to the right of
 allocated 168-byte region [ffff88805d5c7e80, ffff88805d5c7f28)

The buggy address belongs to the physical page:
page:ffffea00017571c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5d5c7
memcg:ffff888026343501
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888141268c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000110011 00000001ffffffff ffff888026343501
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 13305, tgid 13304 (syz.1.3303), ts 532825885083, free_ts 491059900549
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581
 prep_new_page mm/page_alloc.c:1588 [inline]
 get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220
 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500
 alloc_slab_page+0x5d/0x160 mm/slub.c:1881
 allocate_slab mm/slub.c:2028 [inline]
 new_slab+0x87/0x2d0 mm/slub.c:2081
 ___slab_alloc+0xc5d/0x12f0 mm/slub.c:3253
 __slab_alloc mm/slub.c:3339 [inline]
 __slab_alloc_node mm/slub.c:3392 [inline]
 slab_alloc_node mm/slub.c:3485 [inline]
 slab_alloc mm/slub.c:3503 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
 kmem_cache_alloc+0x1b3/0x2d0 mm/slub.c:3519
 kmem_cache_zalloc include/linux/slab.h:711 [inline]
 alloc_buffer_head+0x2d/0x280 fs/buffer.c:3031
 folio_alloc_buffers+0x39b/0x980 fs/buffer.c:935
 folio_create_empty_buffers+0x3a/0x720 fs/buffer.c:1648
 ntfs_read_block fs/ntfs/aops.c:192 [inline]
 ntfs_read_folio+0xe1f/0x2990 fs/ntfs/aops.c:436
 filemap_read_folio+0x172/0x760 mm/filemap.c:2420
 do_read_cache_folio+0x468/0x7d0 mm/filemap.c:3804
 do_read_cache_page+0x32/0x250 mm/filemap.c:3870
 read_mapping_page include/linux/pagemap.h:892 [inline]
 ntfs_map_page fs/ntfs/aops.h:75 [inline]
 load_and_init_upcase fs/ntfs/super.c:1686 [inline]
 load_system_files+0x1635/0x4550 fs/ntfs/super.c:1818
 ntfs_fill_super+0x1818/0x2a50 fs/ntfs/super.c:2900
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1181 [inline]
 free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
 discard_slab mm/slub.c:2127 [inline]
 __unfreeze_partials+0x1cf/0x210 mm/slub.c:2667
 put_cpu_partial+0x17c/0x250 mm/slub.c:2743
 __slab_free+0x319/0x400 mm/slub.c:3700
 qlink_free mm/kasan/quarantine.c:166 [inline]
 qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185
 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767
 slab_alloc_node mm/slub.c:3495 [inline]
 slab_alloc mm/slub.c:3503 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
 kmem_cache_alloc+0x11a/0x2d0 mm/slub.c:3519
 kmem_cache_zalloc include/linux/slab.h:711 [inline]
 jbd2_alloc_handle include/linux/jbd2.h:1608 [inline]
 new_handle fs/jbd2/transaction.c:461 [inline]
 jbd2__journal_start+0x140/0x5b0 fs/jbd2/transaction.c:488
 __ext4_journal_start_sb+0x203/0x560 fs/ext4/ext4_jbd2.c:112
 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
 ext4_dirty_inode+0x93/0x110 fs/ext4/inode.c:6121
 __mark_inode_dirty+0x2cc/0xc90 fs/fs-writeback.c:2471
 generic_update_time fs/inode.c:1981 [inline]
 inode_update_time fs/inode.c:1994 [inline]
 __file_update_time fs/inode.c:2180 [inline]
 file_update_time+0x187/0x1a0 fs/inode.c:2210
 ext4_page_mkwrite+0x201/0x1220 fs/ext4/inode.c:6242

Memory state around the buggy address:
 ffff88805d5c7e00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff88805d5c7e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88805d5c7f00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                     ^
 ffff88805d5c7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805d5c8000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================