loop8: 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+0x2bb/0x3e80 fs/ext4/inode.c:4722
Read of size 8 at addr ffff8881299cfef8 by task syz.8.298/1402

CPU: 1 PID: 1402 Comm: syz.8.298 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 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+0x10f/0x150 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+0x2bb/0x3e80 fs/ext4/inode.c:4722
 ext4_quota_enable fs/ext4/super.c:6435 [inline]
 ext4_enable_quotas+0x338/0x6d0 fs/ext4/super.c:6471
 ext4_fill_super+0x831d/0x8bf0 fs/ext4/super.c:4982
 mount_bdev+0x28d/0x3c0 fs/super.c:1400
 ext4_mount+0x34/0x40 fs/ext4/super.c:6650
 legacy_get_tree+0xed/0x190 fs/fs_context.c:611
 vfs_get_tree+0x89/0x260 fs/super.c:1530
 do_new_mount+0x251/0xb40 fs/namespace.c:3037
 path_mount+0x640/0xff0 fs/namespace.c:3367
 do_mount fs/namespace.c:3380 [inline]
 __do_sys_mount fs/namespace.c:3588 [inline]
 __se_sys_mount+0x320/0x390 fs/namespace.c:3565
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3565
 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: 0033:0x7f19c113634a
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:00007f19bfb8de58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f19bfb8dee0 RCX: 00007f19c113634a
RDX: 0000200000000080 RSI: 0000200000000000 RDI: 00007f19bfb8dea0
RBP: 0000200000000080 R08: 00007f19bfb8dee0 R09: 0000000000000008
R10: 0000000000000008 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f19bfb8dea0 R14: 000000000000050c R15: 0000200000000600
 </TASK>

Allocated by task 404:
 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+0xb7/0xe0 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:3245 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260
 kmem_cache_zalloc include/linux/slab.h:740 [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+0x1d0/0x14d0 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2062 [inline]
 block_page_mkwrite+0x205/0x270 fs/buffer.c:2525
 ext4_page_mkwrite+0xa7d/0x1320 fs/ext4/inode.c:6247
 do_page_mkwrite mm/memory.c:3087 [inline]
 do_shared_fault mm/memory.c:4640 [inline]
 do_fault mm/memory.c:4713 [inline]
 handle_pte_fault+0x138c/0x2770 mm/memory.c:4923
 __handle_mm_fault mm/memory.c:-1 [inline]
 do_handle_mm_fault+0x1b3b/0x1e30 mm/memory.c:5345
 handle_mm_fault include/linux/mm.h:1847 [inline]
 do_user_addr_fault+0x808/0x11c0 arch/x86/mm/fault.c:1416
 handle_page_fault arch/x86/mm/fault.c:1507 [inline]
 exc_page_fault+0x51/0xb0 arch/x86/mm/fault.c:1560
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:606

The buggy address belongs to the object at ffff8881299cfe70
 which belongs to the cache buffer_head of size 104
The buggy address is located 32 bytes to the right of
 104-byte region [ffff8881299cfe70, ffff8881299cfed8)
The buggy address belongs to the page:
page:ffffea0004a673c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1299cf
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea00042471c0 0000001500000015 ffff8881001c5e00
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 405, ts 33996479962, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613
 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487
 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1937 [inline]
 new_slab+0xa0/0x4d0 mm/slub.c:2000
 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033
 __slab_alloc+0x49/0x90 mm/slub.c:3120
 slab_alloc_node mm/slub.c:3211 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc+0x138/0x260 mm/slub.c:3260
 kmem_cache_zalloc include/linux/slab.h:740 [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+0x3f0/0x7d0 fs/buffer.c:1336
 sb_getblk_gfp include/linux/buffer_head.h:368 [inline]
 __ext4_sb_bread_gfp+0x76/0x210 fs/ext4/super.c:210
 ext4_sb_bread_unmovable fs/ext4/super.c:233 [inline]
 ext4_fill_super+0x3054/0x8bf0 fs/ext4/super.c:4392
 mount_bdev+0x28d/0x3c0 fs/super.c:1400
 ext4_mount+0x34/0x40 fs/ext4/super.c:6650
 legacy_get_tree+0xed/0x190 fs/fs_context.c:611
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8881299cfd80: fb fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00
 ffff8881299cfe00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 00
>ffff8881299cfe80: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
                                                                ^
 ffff8881299cff00: fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881299cff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
EXT4-fs warning (device loop8): ext4_enable_quotas:6479: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix.
EXT4-fs (loop8): mount failed