================================================================== 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:1986 Read of size 4 at addr ffff888068b271a8 by task kworker/1:0/31 CPU: 1 UID: 0 PID: 31 Comm: kworker/1:0 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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:1986 fserror_worker+0x230/0x350 fs/fserror.c:69 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 8862: 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:4501 [inline] slab_alloc_node mm/slub.c:4830 [inline] kmem_cache_alloc_lru_noprof+0x33c/0x680 mm/slub.c:4849 xfs_inode_alloc+0x7e/0x670 fs/xfs/xfs_icache.c:97 xfs_iget_cache_miss fs/xfs/xfs_icache.c:635 [inline] xfs_iget+0xa68/0x2dd0 fs/xfs/xfs_icache.c:799 xfs_lookup+0x321/0x670 fs/xfs/xfs_inode.c:553 xfs_vn_lookup+0x130/0x200 fs/xfs/xfs_iops.c:327 __lookup_slow+0x2d2/0x440 fs/namei.c:1916 lookup_slow+0x53/0x70 fs/namei.c:1933 walk_component fs/namei.c:2279 [inline] lookup_last fs/namei.c:2780 [inline] path_lookupat+0x3f5/0x8c0 fs/namei.c:2804 filename_lookup+0x256/0x5d0 fs/namei.c:2833 __do_sys_chroot fs/open.c:597 [inline] __se_sys_chroot+0xa8/0x3f0 fs/open.c:590 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:2687 [inline] slab_free mm/slub.c:6124 [inline] kmem_cache_free+0x185/0x6b0 mm/slub.c:6254 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+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 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+0xade/0x2dd0 fs/xfs/xfs_icache.c:799 xfs_lookup+0x321/0x670 fs/xfs/xfs_inode.c:553 xfs_vn_lookup+0x130/0x200 fs/xfs/xfs_iops.c:327 __lookup_slow+0x2d2/0x440 fs/namei.c:1916 lookup_slow+0x53/0x70 fs/namei.c:1933 walk_component fs/namei.c:2279 [inline] lookup_last fs/namei.c:2780 [inline] path_lookupat+0x3f5/0x8c0 fs/namei.c:2804 filename_lookup+0x256/0x5d0 fs/namei.c:2833 __do_sys_chroot fs/open.c:597 [inline] __se_sys_chroot+0xa8/0x3f0 fs/open.c:590 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 The buggy address belongs to the object at ffff888068b26e80 which belongs to the cache xfs_inode of size 2032 The buggy address is located 808 bytes inside of freed 2032-byte region [ffff888068b26e80, ffff888068b27670) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888068b27700 pfn:0x68b20 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888068b27f81 flags: 0x80000000000240(workingset|head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000240 ffff88801eb7bc80 ffff88801eb7c488 ffffea0001718410 raw: ffff888068b27700 00000008000f000e 00000000f5000000 ffff888068b27f81 head: 0080000000000240 ffff88801eb7bc80 ffff88801eb7c488 ffffea0001718410 head: ffff888068b27700 00000008000f000e 00000000f5000000 ffff888068b27f81 head: 0080000000000003 ffffea0001a2c801 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 3455, tgid 3455 (kworker/u8:11), ts 270735295734, free_ts 102287284390 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:3255 [inline] allocate_slab+0x77/0x660 mm/slub.c:3444 new_slab mm/slub.c:3502 [inline] refill_objects+0x334/0x3c0 mm/slub.c:7134 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x328/0x5f0 mm/slub.c:4578 alloc_from_pcs mm/slub.c:4681 [inline] slab_alloc_node mm/slub.c:4815 [inline] kmem_cache_alloc_lru_noprof+0x433/0x680 mm/slub.c:4849 xfs_inode_alloc+0x7e/0x670 fs/xfs/xfs_icache.c:97 xfs_iget_cache_miss fs/xfs/xfs_icache.c:635 [inline] xfs_iget+0xa68/0x2dd0 fs/xfs/xfs_icache.c:799 xfs_qm_dqusage_adjust+0x1d6/0x650 fs/xfs/xfs_qm.c:1340 xfs_iwalk_ag_recs+0x4ea/0x840 fs/xfs/xfs_iwalk.c:209 xfs_iwalk_run_callbacks+0x236/0x4a0 fs/xfs/xfs_iwalk.c:370 xfs_iwalk_ag+0x953/0xa40 fs/xfs/xfs_iwalk.c:473 xfs_iwalk_ag_work+0xff/0x1b0 fs/xfs/xfs_iwalk.c:620 xfs_pwork_work+0x82/0x190 fs/xfs/xfs_pwork.c:47 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358 page last free pid 5792 tgid 5792 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] __free_pages_ok+0xa92/0xc00 mm/page_alloc.c:1614 __free_frozen_pages+0x11f/0x1170 mm/page_alloc.c:2974 zstd_free_workspace fs/btrfs/zstd.c:366 [inline] zstd_free_workspace_manager+0x2c7/0x390 fs/btrfs/zstd.c:226 btrfs_free_fs_info+0x5e/0x380 fs/btrfs/disk-io.c:1200 deactivate_locked_super+0xbc/0x130 fs/super.c:476 cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888068b27080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888068b27100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888068b27180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888068b27200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888068b27280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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