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BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xc1f/0xc30 fs/ext4/xattr.c:2911
Read of size 4 at addr ffff8881d9b61000 by task syz-executor/350

CPU: 0 PID: 350 Comm: syz-executor Not tainted 5.4.274-syzkaller-00002-g6f97bd951d82 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x241 lib/dump_stack.c:118
 print_address_description+0x8c/0x600 mm/kasan/report.c:384
 __kasan_report+0xf3/0x120 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 ext4_xattr_delete_inode+0xc1f/0xc30 fs/ext4/xattr.c:2911
 ext4_evict_inode+0x1378/0x1ac0 fs/ext4/inode.c:318
 evict+0x29b/0x6a0 fs/inode.c:575
 d_delete_notify include/linux/fsnotify.h:224 [inline]
 vfs_rmdir+0x24b/0x3c0 fs/namei.c:4040
 do_rmdir+0x2c1/0x580 fs/namei.c:4088
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f9298faa167
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 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:00007ffc0d807698 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f9298faa167
RDX: 0000000000000200 RSI: 00007ffc0d808840 RDI: 00000000ffffff9c
RBP: 00007f929901864a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffc0d808840
R13: 00007f929901864a R14: 000000000000572a R15: 00007ffc0d80aa20

Allocated by task 375:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc_node mm/slub.c:2829 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842
 mempool_alloc+0x11f/0x530 mm/mempool.c:393
 bio_alloc_bioset+0x1e0/0x650 block/bio.c:483
 bio_alloc include/linux/bio.h:401 [inline]
 submit_bh_wbc+0x1de/0x850 fs/buffer.c:3042
 submit_bh+0x21/0x30 fs/buffer.c:3076
 read_mmp_block+0x1a2/0x8a0 fs/ext4/mmp.c:91
 ext4_multi_mount_protect+0x1d4/0xa50 fs/ext4/mmp.c:291
 ext4_fill_super+0x5cf7/0x8d90 fs/ext4/super.c:4434
 mount_bdev+0x267/0x370 fs/super.c:1426
 legacy_get_tree+0xdf/0x170 fs/fs_context.c:648
 vfs_get_tree+0x85/0x260 fs/super.c:1556
 do_new_mount+0x292/0x570 fs/namespace.c:2843
 do_mount+0x688/0xe10 fs/namespace.c:3163
 ksys_mount+0xc2/0xf0 fs/namespace.c:3372
 __do_sys_mount fs/namespace.c:3386 [inline]
 __se_sys_mount fs/namespace.c:3383 [inline]
 __x64_sys_mount+0xb1/0xc0 fs/namespace.c:3383
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Freed by task 10:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 kasan_set_free_info mm/kasan/common.c:345 [inline]
 __kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487
 slab_free_hook mm/slub.c:1455 [inline]
 slab_free_freelist_hook mm/slub.c:1494 [inline]
 slab_free mm/slub.c:3080 [inline]
 kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096
 req_bio_endio block/blk-core.c:246 [inline]
 blk_update_request+0x37f/0xe40 block/blk-core.c:1481
 blk_mq_end_request+0x3a/0x70 block/blk-mq.c:571
 blk_done_softirq+0x2f3/0x390 block/blk-softirq.c:37
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292

The buggy address belongs to the object at ffff8881d9b61000
 which belongs to the cache bio-0 of size 216
The buggy address is located 0 bytes inside of
 216-byte region [ffff8881d9b61000, ffff8881d9b610d8)
The buggy address belongs to the page:
page:ffffea000766d840 refcount:1 mapcount:0 mapping:ffff8881f1cf8c80 index:0x0
flags: 0x8000000000000200(slab)
raw: 8000000000000200 dead000000000100 dead000000000122 ffff8881f1cf8c80
raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x192880(GFP_NOWAIT|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_NOMEMALLOC|__GFP_HARDWALL)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x18f/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893
 alloc_slab_page+0x39/0x3c0 mm/slub.c:343
 allocate_slab mm/slub.c:1683 [inline]
 new_slab+0x97/0x440 mm/slub.c:1749
 new_slab_objects mm/slub.c:2505 [inline]
 ___slab_alloc+0x2fe/0x490 mm/slub.c:2667
 __slab_alloc+0x62/0xa0 mm/slub.c:2707
 slab_alloc_node mm/slub.c:2792 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc+0x109/0x250 mm/slub.c:2842
 mempool_alloc+0x11f/0x530 mm/mempool.c:393
 bio_alloc_bioset+0x1e0/0x650 block/bio.c:483
 bio_alloc include/linux/bio.h:401 [inline]
 mpage_alloc fs/mpage.c:115 [inline]
 do_mpage_readpage+0x14db/0x1b20 fs/mpage.c:342
 mpage_readpages+0x36e/0x500 fs/mpage.c:440
 read_pages+0x119/0x400 mm/readahead.c:126
 __do_page_cache_readahead+0x448/0x4f0 mm/readahead.c:212
 force_page_cache_readahead mm/readahead.c:243 [inline]
 page_cache_sync_readahead+0x3f0/0x460 mm/readahead.c:522
 generic_file_buffered_read mm/filemap.c:2209 [inline]
 generic_file_read_iter+0x673/0x21f0 mm/filemap.c:2482
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8881d9b60f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881d9b60f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881d9b61000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8881d9b61080: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
 ffff8881d9b61100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
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