loop4: detected capacity change from 0 to 4096
==================================================================
BUG: KASAN: use-after-free in __ext4_iget+0x2ee/0x3f00 fs/ext4/inode.c:4672
Read of size 8 at addr ffff8881441efef8 by task syz-executor.4/10990

CPU: 1 PID: 10990 Comm: syz-executor.4 Not tainted 5.15.132-syzkaller-01173-g754f8cc9b7de #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description+0x87/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:444
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
 __ext4_iget+0x2ee/0x3f00 fs/ext4/inode.c:4672
 ext4_quota_enable fs/ext4/super.c:6366 [inline]
 ext4_enable_quotas+0x556/0x980 fs/ext4/super.c:6402
 ext4_fill_super+0x8b95/0x96e0 fs/ext4/super.c:4950
 mount_bdev+0x282/0x3b0 fs/super.c:1387
 ext4_mount+0x34/0x40 fs/ext4/super.c:6581
 legacy_get_tree+0xf1/0x190 fs/fs_context.c:611
 vfs_get_tree+0x88/0x290 fs/super.c:1517
 do_new_mount+0x28b/0xad0 fs/namespace.c:2994
 path_mount+0x671/0x1070 fs/namespace.c:3324
 do_mount fs/namespace.c:3337 [inline]
 __do_sys_mount fs/namespace.c:3545 [inline]
 __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3522
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3522
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f65548941ea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6553614ee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f6553614f80 RCX: 00007f65548941ea
RDX: 0000000020000bc0 RSI: 0000000020000c00 RDI: 00007f6553614f40
RBP: 0000000020000bc0 R08: 00007f6553614f80 R09: 0000000006000000
R10: 0000000006000000 R11: 0000000000000202 R12: 0000000020000c00
R13: 00007f6553614f40 R14: 0000000000000b85 R15: 0000000020000c40
 </TASK>

The buggy address belongs to the page:
page:ffffea0005107bc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x2 pfn:0x1441ef
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 ffffea00051e8388 ffffea0004717e08 0000000000000000
raw: 0000000000000002 0000000000180000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x112c50(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 10390, ts 554553738834, free_ts 591167753975
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2602
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2608
 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4482
 __alloc_pages+0x206/0x5e0 mm/page_alloc.c:5773
 allocate_slab mm/slub.c:1932 [inline]
 new_slab+0x9a/0x4e0 mm/slub.c:1995
 ___slab_alloc+0x39e/0x830 mm/slub.c:3028
 __slab_alloc+0x4a/0x90 mm/slub.c:3115
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3248 [inline]
 kmem_cache_alloc+0x134/0x200 mm/slub.c:3253
 kmem_cache_zalloc include/linux/slab.h:723 [inline]
 alloc_buffer_head+0x26/0x110 fs/buffer.c:3311
 alloc_page_buffers+0x192/0x390 fs/buffer.c:832
 create_empty_buffers+0x3d/0x4c0 fs/buffer.c:1562
 ext4_block_write_begin+0x280/0x12a0 fs/ext4/inode.c:1060
 ext4_da_write_begin+0x5da/0xc30 fs/ext4/inode.c:3011
 generic_perform_write+0x2bc/0x5a0 mm/filemap.c:3833
 ext4_buffered_write_iter+0x48a/0x610 fs/ext4/file.c:270
 ext4_file_write_iter+0x443/0x1c80
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1469 [inline]
 free_pcp_prepare mm/page_alloc.c:1541 [inline]
 free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3531
 free_unref_page+0xe6/0x730 mm/page_alloc.c:3613
 free_the_page mm/page_alloc.c:802 [inline]
 __free_pages+0x61/0xf0 mm/page_alloc.c:5849
 __free_slab+0xec/0x1d0 mm/slub.c:2020
 free_slab mm/slub.c:2035 [inline]
 discard_slab mm/slub.c:2041 [inline]
 __unfreeze_partials+0x165/0x1a0 mm/slub.c:2527
 put_cpu_partial+0xc4/0x120 mm/slub.c:2607
 __slab_free+0x1c8/0x290 mm/slub.c:3388
 do_slab_free mm/slub.c:3507 [inline]
 ___cache_free+0x109/0x120 mm/slub.c:3526
 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157
 qlist_free_all+0x44/0xb0 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x15a/0x180 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3240 [inline]
 slab_alloc mm/slub.c:3248 [inline]
 kmem_cache_alloc+0xf5/0x200 mm/slub.c:3253
 getname_flags+0xba/0x520 fs/namei.c:138
 user_path_at_empty+0x2d/0x1a0 fs/namei.c:2852

Memory state around the buggy address:
 ffff8881441efd80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881441efe00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881441efe80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                                ^
 ffff8881441eff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881441eff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
EXT4-fs warning (device loop4): ext4_enable_quotas:6410: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix.
EXT4-fs (loop4): mount failed