================================================================== BUG: KASAN: slab-use-after-free in inode_state_read_once include/linux/fs.h:884 [inline] BUG: KASAN: slab-use-after-free in iput+0x3a7/0xe80 fs/inode.c:1977 Read of size 4 at addr ffff88803e771ca8 by task kworker/1:8/9491 CPU: 1 UID: 0 PID: 9491 Comm: kworker/1:8 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Workqueue: events fserror_worker Call Trace: 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 inode_state_read_once include/linux/fs.h:884 [inline] iput+0x3a7/0xe80 fs/inode.c:1977 fserror_worker+0x230/0x350 fs/fserror.c:69 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340 worker_thread+0xda6/0x1360 kernel/workqueue.c:3421 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Allocated by task 13121: kasan_sa[ 845.274068][ T9491] kasan_save_stack mm/kasan/common.c:57 [inline] kasan_sa[ 845.274068][ T9491] 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:5263 [inline] kmem_cache_alloc_lru_noprof+0x18e/0x6a0 mm/slub.c:5282 xfs_inode_alloc+0x7e/0x670 fs/xfs/xfs_icache.c:97 xfs_iget_cache_miss fs/xfs/xfs_icache.c:635 [inline] xfs_iget+0xa6b/0x2cb0 fs/xfs/xfs_icache.c:799 xfs_lookup+0x321/0x630 fs/xfs/xfs_inode.c:553 xfs_vn_lookup+0x130/0x200 fs/xfs/xfs_iops.c:327 lookup_open fs/namei.c:4456 [inline] open_last_lookups fs/namei.c:4583 [inline] path_openat+0x11cb/0x38a0 fs/namei.c:4827 do_file_open+0x23e/0x4a0 fs/namei.c:4859 do_sys_openat2+0x113/0x200 fs/open.c:1366 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1383 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 28: 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+0x18d/0x8c0 mm/slub.c:6789 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:467 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3131 [inline] call_rcu+0xee/0x890 kernel/rcu/tree.c:3251 xfs_iget_cache_miss fs/xfs/xfs_icache.c:740 [inline] xfs_iget+0xae5/0x2cb0 fs/xfs/xfs_icache.c:799 xfs_lookup+0x321/0x630 fs/xfs/xfs_inode.c:553 xfs_vn_lookup+0x130/0x200 fs/xfs/xfs_iops.c:327 lookup_open fs/namei.c:4456 [inline] open_last_lookups fs/namei.c:4583 [inline] path_openat+0x11cb/0x38a0 fs/namei.c:4827 do_file_open+0x23e/0x4a0 fs/namei.c:4859 do_sys_openat2+0x113/0x200 fs/open.c:1366 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1383 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88803e771980 which belongs to the cache xfs_inode of size 2032 The buggy address is located 808 bytes inside of freed 2032-byte region [ffff88803e771980, ffff88803e772170) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3e770 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88805e0d1701 ksm flags: 0x80000000000040(head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000040 ffff888144ac3140 ffffea0000f9f800 0000000000000003 raw: 0000000000000000 00000000800f000f 00000000f5000000 ffff88805e0d1701 head: 0080000000000040 ffff888144ac3140 ffffea0000f9f800 0000000000000003 head: 0000000000000000 00000000800f000f 00000000f5000000 ffff88805e0d1701 head: 0080000000000003 ffffea0000f9dc01 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_RECLAIMABLE|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6010, tgid 6009 (syz.0.19), ts 93082650218, free_ts 92784117770 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x228/0x280 mm/page_alloc.c:1884 prep_new_page mm/page_alloc.c:1892 [inline] get_page_from_freelist+0x28bb/0x2950 mm/page_alloc.c:3945 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5240 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab+0x86/0x3a0 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0xaf8/0x13d0 mm/slub.c:4656 __slab_alloc+0xc5/0x1f0 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] kmem_cache_alloc_lru_noprof+0x103/0x6a0 mm/slub.c:5282 xfs_inode_alloc+0x7e/0x670 fs/xfs/xfs_icache.c:97 xfs_iget_cache_miss fs/xfs/xfs_icache.c:635 [inline] xfs_iget+0xa6b/0x2cb0 fs/xfs/xfs_icache.c:799 xfs_mountfs+0x110c/0x22e0 fs/xfs/xfs_mount.c:1072 xfs_fs_fill_super+0x11b5/0x1600 fs/xfs/xfs_super.c:1947 get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1694 vfs_get_tree+0x92/0x2a0 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3760 [inline] do_new_mount+0x341/0xd30 fs/namespace.c:3836 do_mount fs/namespace.c:4159 [inline] __do_sys_mount fs/namespace.c:4348 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4325 page last free pid 6011 tgid 6011 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0xfd0/0x1160 mm/page_alloc.c:2973 discard_slab mm/slub.c:3346 [inline] __put_partials+0x149/0x170 mm/slub.c:3886 __slab_free+0x2af/0x330 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:5263 [inline] __do_kmalloc_node mm/slub.c:5656 [inline] __kvmalloc_node_noprof+0x382/0x8f0 mm/slub.c:7144 seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x203/0xe20 fs/seq_file.c:210 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x58b/0xa70 fs/read_write.c:574 ksys_read+0x156/0x270 fs/read_write.c:717 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88803e771b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803e771c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88803e771c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803e771d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803e771d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================