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BUG: KASAN: slab-use-after-free in xfs_inode_item_push+0x3c3/0x6d0 fs/xfs/xfs_inode_item.c:801
Read of size 8 at addr ffff88805c5a9290 by task xfsaild/loop3/6386

CPU: 0 UID: 0 PID: 6386 Comm: xfsaild/loop3 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 xfs_inode_item_push+0x3c3/0x6d0 fs/xfs/xfs_inode_item.c:801
 xfsaild_push_item fs/xfs/xfs_trans_ail.c:390 [inline]
 xfsaild_push fs/xfs/xfs_trans_ail.c:518 [inline]
 xfsaild+0xd9e/0x2950 fs/xfs/xfs_trans_ail.c:700
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 6372:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 unpoison_slab_object mm/kasan/common.c:342 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:368
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4978 [inline]
 slab_alloc_node mm/slub.c:5288 [inline]
 kmem_cache_alloc_noprof+0x181/0x6b0 mm/slub.c:5295
 xfs_inode_item_init+0x33/0xd0 fs/xfs/xfs_inode_item.c:929
 xfs_trans_ijoin+0xe5/0x130 fs/xfs/libxfs/xfs_trans_inode.c:36
 xfs_trans_alloc_ichange+0x200/0x6e0 fs/xfs/xfs_trans.c:1253
 xfs_setattr_nonsize+0x402/0xcb0 fs/xfs/xfs_iops.c:837
 xfs_vn_setattr+0x28f/0x300 fs/xfs/xfs_iops.c:1178
 notify_change+0xc18/0xf60 fs/attr.c:546
 chmod_common+0x248/0x400 fs/open.c:650
 do_fchmodat+0x12d/0x200 fs/open.c:697
 __do_sys_fchmodat fs/open.c:716 [inline]
 __se_sys_fchmodat fs/open.c:713 [inline]
 __x64_sys_fchmodat+0x7d/0x90 fs/open.c:713
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 20:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587
 kasan_save_free_info mm/kasan/kasan.h:406 [inline]
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2543 [inline]
 slab_free mm/slub.c:6642 [inline]
 kmem_cache_free+0x19a/0x910 mm/slub.c:6752
 xfs_inode_free_callback+0x14f/0x1c0 fs/xfs/xfs_icache.c:161
 rcu_do_batch kernel/rcu/tree.c:2605 [inline]
 rcu_core kernel/rcu/tree.c:2861 [inline]
 rcu_cpu_kthread+0xbf6/0x1b50 kernel/rcu/tree.c:2949
 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff88805c5a9260
 which belongs to the cache xfs_ili of size 328
The buggy address is located 48 bytes inside of
 freed 328-byte region [ffff88805c5a9260, ffff88805c5a93a8)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805c5a8310 pfn:0x5c5a8
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x80000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000040 ffff88801f361280 dead000000000122 0000000000000000
raw: ffff88805c5a8310 0000000080140013 00000000f5000000 0000000000000000
head: 0080000000000040 ffff88801f361280 dead000000000122 0000000000000000
head: ffff88805c5a8310 0000000080140013 00000000f5000000 0000000000000000
head: 0080000000000001 ffffea0001716a01 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Reclaimable, gfp_mask 0xd2050(__GFP_RECLAIMABLE|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5992, tgid 5991 (syz.3.12), ts 104752100269, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x28c0/0x2960 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:3059 [inline]
 allocate_slab+0x96/0x350 mm/slub.c:3232
 new_slab mm/slub.c:3286 [inline]
 ___slab_alloc+0xb10/0x1400 mm/slub.c:4655
 __slab_alloc+0xc6/0x1f0 mm/slub.c:4778
 __slab_alloc_node mm/slub.c:4854 [inline]
 slab_alloc_node mm/slub.c:5276 [inline]
 kmem_cache_alloc_noprof+0xec/0x6b0 mm/slub.c:5295
 xfs_inode_item_init+0x33/0xd0 fs/xfs/xfs_inode_item.c:929
 xfs_trans_ijoin+0xe5/0x130 fs/xfs/libxfs/xfs_trans_inode.c:36
 xfs_icreate+0xe4/0x160 fs/xfs/xfs_inode.c:605
 xfs_qm_qino_alloc+0x232/0x6a0 fs/xfs/xfs_qm.c:1010
 xfs_qm_init_quotainos+0x7a9/0x980 fs/xfs/xfs_qm.c:1838
 xfs_qm_init_quotainfo+0x175/0x1210 fs/xfs/xfs_qm.c:836
 xfs_qm_mount_quotas+0xa6/0x670 fs/xfs/xfs_qm.c:1676
 xfs_mountfs+0x1af2/0x22c0 fs/xfs/xfs_mount.c:1187
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88805c5a9180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88805c5a9200: 00 00 00 00 fc fc fc fc fc fc fc fc fa fb fb fb
>ffff88805c5a9280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff88805c5a9300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88805c5a9380: fb fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb
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