syzbot

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BUG: KASAN: slab-use-after-free in xfs_inode_item_push+0x3ac/0x774 fs/xfs/xfs_inode_item.c:801
Read of size 8 at addr ffff0000dcf83408 by task xfsaild/loop0/12811

CPU: 1 UID: 0 PID: 12811 Comm: xfsaild/loop0 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xa8/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0xb0/0x110 mm/kasan/report.c:595
 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381
 xfs_inode_item_push+0x3ac/0x774 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+0xb34/0x2868 fs/xfs/xfs_trans_ail.c:700
 kthread+0x5fc/0x75c kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844

Allocated by task 12803:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:77
 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:573
 unpoison_slab_object mm/kasan/common.c:342 [inline]
 __kasan_slab_alloc+0x70/0x88 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+0x338/0x648 mm/slub.c:5295
 xfs_inode_item_init+0x3c/0xc0 fs/xfs/xfs_inode_item.c:929
 xfs_trans_ijoin+0xe0/0x12c fs/xfs/libxfs/xfs_trans_inode.c:36
 xfs_create+0x534/0x998 fs/xfs/xfs_inode.c:732
 xfs_generic_create+0x2e8/0x8f4 fs/xfs/xfs_iops.c:216
 xfs_vn_mkdir+0x44/0x5c fs/xfs/xfs_iops.c:309
 vfs_mkdir+0x284/0x424 fs/namei.c:4453
 do_mkdirat+0x1f8/0x4c8 fs/namei.c:4486
 __do_sys_mkdirat fs/namei.c:4503 [inline]
 __se_sys_mkdirat fs/namei.c:4501 [inline]
 __arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4501
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

Freed by task 12784:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:77
 __kasan_save_free_info+0x58/0x70 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+0x74/0xa4 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+0x18c/0x6dc mm/slub.c:6752
 xfs_inode_item_destroy+0x70/0x84 fs/xfs/xfs_inode_item.c:951
 xfs_inode_free_callback+0x14c/0x1bc fs/xfs/xfs_icache.c:161
 rcu_do_batch kernel/rcu/tree.c:2605 [inline]
 rcu_core+0x840/0x17d0 kernel/rcu/tree.c:2861
 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2878
 handle_softirqs+0x328/0xc88 kernel/softirq.c:622
 __do_softirq+0x14/0x20 kernel/softirq.c:656

The buggy address belongs to the object at ffff0000dcf833d8
 which belongs to the cache xfs_ili of size 264
The buggy address is located 48 bytes inside of
 freed 264-byte region [ffff0000dcf833d8, ffff0000dcf834e0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11cf83
ksm flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000000 ffff0000c54208c0 fffffdffc3734b80 0000000000000003
raw: 0000000000000000 00000000000c000c 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000dcf83300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000dcf83380: 00 00 00 fc fc fc fc fc fc fc fc fa fb fb fb fb
>ffff0000dcf83400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff0000dcf83480: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff0000dcf83500: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb
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