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BUG: KASAN: slab-use-after-free in xfs_inode_item_push+0x396/0x720 fs/xfs/xfs_inode_item.c:798
Read of size 8 at addr ffff88805d184f80 by task xfsaild/loop8/8014

CPU: 0 UID: 0 PID: 8014 Comm: xfsaild/loop8 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xba/0x230 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 xfs_inode_item_push+0x396/0x720 fs/xfs/xfs_inode_item.c:798
 xfsaild_push_item fs/xfs/xfs_trans_ail.c:390 [inline]
 xfsaild_push fs/xfs/xfs_trans_ail.c:518 [inline]
 xfsaild+0x10c6/0x2b00 fs/xfs/xfs_trans_ail.c:700
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 7976:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4542 [inline]
 slab_alloc_node mm/slub.c:4869 [inline]
 kmem_cache_alloc_noprof+0x33b/0x680 mm/slub.c:4876
 xfs_inode_item_init+0x33/0xd0 fs/xfs/xfs_inode_item.c:926
 xfs_trans_ijoin+0xe5/0x130 fs/xfs/libxfs/xfs_trans_inode.c:36
 xfs_create+0x677/0xb30 fs/xfs/xfs_inode.c:732
 xfs_generic_create+0x413/0xb30 fs/xfs/xfs_iops.c:216
 xfs_vn_mkdir+0x37/0x50 fs/xfs/xfs_iops.c:309
 vfs_mkdir+0x40b/0x630 fs/namei.c:5233
 filename_mkdirat+0x289/0x520 fs/namei.c:5266
 __do_sys_mkdirat fs/namei.c:5287 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5284
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 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:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2692 [inline]
 slab_free mm/slub.c:6168 [inline]
 kmem_cache_free+0x185/0x6b0 mm/slub.c:6298
 xfs_inode_free_callback+0x14f/0x1c0 fs/xfs/xfs_icache.c:161
 rcu_do_batch kernel/rcu/tree.c:2617 [inline]
 rcu_core kernel/rcu/tree.c:2869 [inline]
 rcu_cpu_kthread+0x99e/0x1470 kernel/rcu/tree.c:2957
 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 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 ffff88805d184f50
 which belongs to the cache xfs_ili of size 328
The buggy address is located 48 bytes inside of
 freed 328-byte region [ffff88805d184f50, ffff88805d185098)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805d185260 pfn:0x5d184
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x80000000000240(workingset|head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000240 ffff88801e35a640 ffffea0001746190 ffffea00017cfd90
raw: ffff88805d185260 0000000800140004 00000000f5000000 0000000000000000
head: 0080000000000240 ffff88801e35a640 ffffea0001746190 ffffea00017cfd90
head: ffff88805d185260 0000000800140004 00000000f5000000 0000000000000000
head: 0080000000000001 ffffea0001746101 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 6073, tgid 6072 (syz.0.26), ts 91937891836, free_ts 87760122576
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
 prep_new_page mm/page_alloc.c:1897 [inline]
 get_page_from_freelist+0x28bb/0x2950 mm/page_alloc.c:3962
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
 alloc_slab_page mm/slub.c:3296 [inline]
 allocate_slab+0x77/0x660 mm/slub.c:3485
 new_slab mm/slub.c:3543 [inline]
 refill_objects+0x334/0x3c0 mm/slub.c:7178
 __pcs_replace_empty_main+0x371/0x5c0 mm/slub.c:-1
 alloc_from_pcs mm/slub.c:4720 [inline]
 slab_alloc_node mm/slub.c:4854 [inline]
 kmem_cache_alloc_noprof+0x433/0x680 mm/slub.c:4876
 xfs_inode_item_init+0x33/0xd0 fs/xfs/xfs_inode_item.c:926
 xfs_trans_ijoin+0xe5/0x130 fs/xfs/libxfs/xfs_trans_inode.c:36
 xfs_trans_alloc_ichange+0x258/0x710 fs/xfs/xfs_trans.c:1257
 xfs_setattr_nonsize+0x410/0xcc0 fs/xfs/xfs_iops.c:837
 xfs_vn_setattr+0x29e/0x310 fs/xfs/xfs_iops.c:1178
 notify_change+0xc18/0xf60 fs/attr.c:556
 chmod_common+0x273/0x4a0 fs/open.c:639
 do_fchmodat+0x12d/0x230 fs/open.c:684
 __do_sys_fchmodat fs/open.c:703 [inline]
 __se_sys_fchmodat fs/open.c:700 [inline]
 __x64_sys_fchmodat+0x7d/0x90 fs/open.c:700
page last free pid 6013 tgid 6012 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1433 [inline]
 __free_frozen_pages+0xfe3/0x1170 mm/page_alloc.c:2978
 __slab_free+0x24f/0x2a0 mm/slub.c:5576
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4542 [inline]
 slab_alloc_node mm/slub.c:4869 [inline]
 kmem_cache_alloc_noprof+0x33b/0x680 mm/slub.c:4876
 anon_vma_alloc mm/rmap.c:94 [inline]
 __anon_vma_prepare+0x117/0x4a0 mm/rmap.c:201
 __vmf_anon_prepare mm/memory.c:3734 [inline]
 vmf_anon_prepare mm/internal.h:502 [inline]
 do_anonymous_page mm/memory.c:5262 [inline]
 do_pte_missing+0x1d20/0x29e0 mm/memory.c:4475
 handle_pte_fault mm/memory.c:6317 [inline]
 __handle_mm_fault mm/memory.c:6455 [inline]
 handle_mm_fault+0xd0a/0x13c0 mm/memory.c:6624
 do_user_addr_fault+0xa73/0x1340 arch/x86/mm/fault.c:1334
 handle_page_fault arch/x86/mm/fault.c:1474 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618

Memory state around the buggy address:
 ffff88805d184e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805d184f00: fc fc fc fc fc fc fc fc fc fc fa fb fb fb fb fb
>ffff88805d184f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88805d185000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88805d185080: fb fb fb fc fc fc fc fc fc fc fc 00 00 00 00 00
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