================================================================== BUG: KASAN: slab-use-after-free in xfs_inode_item_push+0x705/0x730 fs/xfs/xfs_inode_item.c:801 Read of size 8 at addr ffff888055334bb8 by task xfsaild/loop5/21420 CPU: 0 UID: 0 PID: 21420 Comm: xfsaild/loop5 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 xfs_inode_item_push+0x705/0x730 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+0xc5b/0x2b90 fs/xfs/xfs_trans_ail.c:700 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x855/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 21389: kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:342 [inline] __kasan_slab_alloc+0x89/0x90 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+0x250/0x720 mm/slub.c:5295 xfs_inode_item_init+0x24/0xc0 fs/xfs/xfs_inode_item.c:929 xfs_trans_ijoin+0xfc/0x160 fs/xfs/libxfs/xfs_trans_inode.c:36 xfs_icreate+0x10a/0x170 fs/xfs/xfs_inode.c:605 xfs_create+0x72f/0xc10 fs/xfs/xfs_inode.c:721 xfs_generic_create+0x6b3/0x830 fs/xfs/xfs_iops.c:216 vfs_create+0x63a/0x9e0 fs/namei.c:4132 do_mknodat+0x4f2/0x6f0 fs/namei.c:5039 __do_sys_mknod fs/namei.c:5076 [inline] __se_sys_mknod fs/namei.c:5074 [inline] __x64_sys_mknod+0x87/0xb0 fs/namei.c:5074 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 21429: kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 __kasan_save_free_info+0x3b/0x60 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+0x5f/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+0x328/0x7d0 mm/slub.c:6752 xfs_inode_free_callback+0x159/0x240 fs/xfs/xfs_icache.c:161 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0x72e/0x1500 kernel/rcu/tree.c:2857 handle_softirqs+0x219/0x8b0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1055 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1055 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 The buggy address belongs to the object at ffff888055334b88 which belongs to the cache xfs_ili of size 264 The buggy address is located 48 bytes inside of freed 264-byte region [ffff888055334b88, ffff888055334c90) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888055334000 pfn:0x55334 anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801efdbb40 0000000000000000 0000000000000001 raw: ffff888055334000 00000000800c0007 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 6132, tgid 6131 (syz.3.46), ts 128206214252, free_ts 35778254434 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1845 prep_new_page mm/page_alloc.c:1853 [inline] get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3879 __alloc_frozen_pages_noprof+0x25f/0x2440 mm/page_alloc.c:5178 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:3059 [inline] allocate_slab mm/slub.c:3232 [inline] new_slab+0x24a/0x360 mm/slub.c:3286 ___slab_alloc+0xee7/0x1cd0 mm/slub.c:4655 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4778 __slab_alloc_node mm/slub.c:4854 [inline] slab_alloc_node mm/slub.c:5276 [inline] kmem_cache_alloc_noprof+0x43f/0x720 mm/slub.c:5295 xfs_inode_item_init+0x24/0xc0 fs/xfs/xfs_inode_item.c:929 xfs_trans_ijoin+0xfc/0x160 fs/xfs/libxfs/xfs_trans_inode.c:36 xfs_vn_update_time+0x334/0x590 fs/xfs/xfs_iops.c:1224 inode_update_time fs/inode.c:2166 [inline] file_update_time_flags+0x2e6/0x520 fs/inode.c:2394 file_modified_flags fs/inode.c:2445 [inline] kiocb_modified+0x79/0xa0 fs/inode.c:2478 xfs_file_write_checks+0x578/0xa80 fs/xfs/xfs_file.c:490 xfs_file_buffered_write+0x15c/0x8f0 fs/xfs/xfs_file.c:972 xfs_file_write_iter+0x480/0xa70 fs/xfs/xfs_file.c:1129 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1394 [inline] __free_frozen_pages+0x7df/0x1160 mm/page_alloc.c:2901 __free_pages mm/page_alloc.c:5297 [inline] free_contig_range+0x183/0x4a0 mm/page_alloc.c:7141 destroy_args+0xc30/0x12d0 mm/debug_vm_pgtable.c:958 debug_vm_pgtable+0x19ec/0x3460 mm/debug_vm_pgtable.c:1345 do_one_initcall+0x123/0x680 init/main.c:1283 do_initcall_level init/main.c:1345 [inline] do_initcalls init/main.c:1361 [inline] do_basic_setup init/main.c:1380 [inline] kernel_init_freeable+0x5c8/0x920 init/main.c:1593 kernel_init+0x1c/0x2b0 init/main.c:1483 ret_from_fork+0x855/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888055334a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888055334b00: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc >ffff888055334b80: fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888055334c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888055334c80: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb ==================================================================