================================================================== BUG: KASAN: slab-use-after-free in xfs_inode_item_push+0x396/0x680 fs/xfs/xfs_inode_item.c:798 Read of size 8 at addr ffff888077699030 by task xfsaild/loop2/6669 CPU: 0 UID: 0 PID: 6669 Comm: xfsaild/loop2 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: 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+0x396/0x680 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+0xd95/0x28c0 fs/xfs/xfs_trans_ail.c:700 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Allocated by task 6622: 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:4953 [inline] slab_alloc_node mm/slub.c:5267 [inline] kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5274 xfs_inode_item_init+0x33/0xc0 fs/xfs/xfs_inode_item.c:926 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:962 xfs_qm_init_quotainos+0x773/0x980 fs/xfs/xfs_qm.c:1787 xfs_qm_init_quotainfo+0x181/0x1150 fs/xfs/xfs_qm.c:788 xfs_qm_mount_quotas+0xa6/0x670 fs/xfs/xfs_qm.c:1633 xfs_mountfs+0x1af2/0x22c0 fs/xfs/xfs_mount.c:1187 xfs_fs_fill_super+0x11f1/0x1640 fs/xfs/xfs_super.c:1960 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691 vfs_get_tree+0x92/0x2a0 fs/super.c:1751 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3712 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4201 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 23: 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:2540 [inline] slab_free mm/slub.c:6674 [inline] kmem_cache_free+0x197/0x620 mm/slub.c:6785 xfs_inode_free_callback+0x14f/0x1c0 fs/xfs/xfs_icache.c:161 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0xd70/0x1870 kernel/rcu/tree.c:2857 handle_softirqs+0x27d/0x850 kernel/softirq.c:626 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1067 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 The buggy address belongs to the object at ffff888077699000 which belongs to the cache xfs_ili of size 264 The buggy address is located 48 bytes inside of freed 264-byte region [ffff888077699000, ffff888077699108) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x77699 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff888141abf140 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800c000c 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x52c50(GFP_NOFS|__GFP_RECLAIMABLE|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6622, tgid 6620 (syz.2.131), ts 146338315950, free_ts 110276267013 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x234/0x290 mm/page_alloc.c:1857 prep_new_page mm/page_alloc.c:1865 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3915 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab+0x86/0x3b0 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0xf2b/0x1960 mm/slub.c:4656 __slab_alloc+0x65/0x100 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5255 [inline] kmem_cache_alloc_noprof+0x40f/0x710 mm/slub.c:5274 xfs_inode_item_init+0x33/0xc0 fs/xfs/xfs_inode_item.c:926 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:962 xfs_qm_init_quotainos+0x773/0x980 fs/xfs/xfs_qm.c:1787 xfs_qm_init_quotainfo+0x181/0x1150 fs/xfs/xfs_qm.c:788 xfs_qm_mount_quotas+0xa6/0x670 fs/xfs/xfs_qm.c:1633 xfs_mountfs+0x1af2/0x22c0 fs/xfs/xfs_mount.c:1187 page last free pid 5186 tgid 5186 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2943 discard_slab mm/slub.c:3346 [inline] __put_partials+0x146/0x170 mm/slub.c:3886 put_cpu_partial+0x1f2/0x2d0 mm/slub.c:3961 __slab_free+0x288/0x2a0 mm/slub.c:5956 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:4953 [inline] slab_alloc_node mm/slub.c:5267 [inline] kmem_cache_alloc_node_noprof+0x43c/0x720 mm/slub.c:5319 __alloc_skb+0x255/0x430 net/core/skbuff.c:679 alloc_skb include/linux/skbuff.h:1383 [inline] alloc_skb_with_frags+0xca/0x890 net/core/skbuff.c:6712 sock_alloc_send_pskb+0x84d/0x980 net/core/sock.c:2995 unix_dgram_sendmsg+0x454/0x1840 net/unix/af_unix.c:2130 sock_sendmsg_nosec+0x18f/0x1d0 net/socket.c:737 __sock_sendmsg net/socket.c:752 [inline] __sys_sendto+0x3ce/0x540 net/socket.c:2221 __do_sys_sendto net/socket.c:2228 [inline] __se_sys_sendto net/socket.c:2224 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2224 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 Memory state around the buggy address: ffff888077698f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888077698f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888077699000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888077699080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888077699100: fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb ==================================================================