================================================================== BUG: KASAN: use-after-free in inode_dirtied_after fs/fs-writeback.c:1335 [inline] BUG: KASAN: use-after-free in move_expired_inodes+0x765/0x7e0 fs/fs-writeback.c:1367 Read of size 8 at addr ffff8880735915a8 by task kworker/u4:4/56 CPU: 0 PID: 56 Comm: kworker/u4:4 Not tainted 6.1.0-rc5-next-20221116-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: writeback wb_workfn (flush-7:0) Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:253 [inline] print_report+0x15e/0x45d mm/kasan/report.c:364 kasan_report+0xbf/0x1f0 mm/kasan/report.c:464 inode_dirtied_after fs/fs-writeback.c:1335 [inline] move_expired_inodes+0x765/0x7e0 fs/fs-writeback.c:1367 queue_io+0x205/0x600 fs/fs-writeback.c:1427 wb_writeback+0xa0b/0xd70 fs/fs-writeback.c:2042 wb_do_writeback fs/fs-writeback.c:2187 [inline] wb_workfn+0x2e0/0x12f0 fs/fs-writeback.c:2227 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 5297: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x82/0x90 mm/kasan/common.c:330 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slub.c:3433 [inline] slab_alloc mm/slub.c:3441 [inline] __kmem_cache_alloc_lru mm/slub.c:3448 [inline] kmem_cache_alloc_lru+0x26c/0x760 mm/slub.c:3464 alloc_inode_sb include/linux/fs.h:3090 [inline] fat_alloc_inode+0x27/0x1f0 fs/fat/inode.c:750 alloc_inode+0x61/0x230 fs/inode.c:259 new_inode_pseudo fs/inode.c:1018 [inline] new_inode+0x2b/0x280 fs/inode.c:1046 fat_build_inode+0x14a/0x2e0 fs/fat/inode.c:603 vfat_create+0x1cb/0x270 fs/fat/namei_vfat.c:776 lookup_open.isra.0+0xee7/0x1270 fs/namei.c:3413 open_last_lookups fs/namei.c:3481 [inline] path_openat+0x975/0x2a50 fs/namei.c:3710 do_filp_open+0x1ba/0x410 fs/namei.c:3740 do_sys_openat2+0x16d/0x4c0 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __x64_sys_openat+0x143/0x1f0 fs/open.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 0: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518 ____kasan_slab_free mm/kasan/common.c:241 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:205 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1763 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1789 slab_free mm/slub.c:3696 [inline] kmem_cache_free+0xee/0x5c0 mm/slub.c:3718 i_callback+0x43/0x70 fs/inode.c:248 rcu_do_batch kernel/rcu/tree.c:2092 [inline] rcu_core+0x81f/0x1980 kernel/rcu/tree.c:2352 __do_softirq+0x1fb/0xadc kernel/softirq.c:571 Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488 __call_rcu_common.constprop.0+0x99/0x820 kernel/rcu/tree.c:2601 destroy_inode+0x129/0x1b0 fs/inode.c:314 iput_final fs/inode.c:1747 [inline] iput.part.0+0x59b/0x880 fs/inode.c:1773 iput+0x5c/0x80 fs/inode.c:1763 dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401 __dentry_kill+0x3c0/0x640 fs/dcache.c:607 dentry_kill fs/dcache.c:745 [inline] dput+0x651/0xdb0 fs/dcache.c:913 __fput+0x3cc/0xa90 fs/file_table.c:328 task_work_run+0x16f/0x270 kernel/task_work.c:179 ptrace_notify+0x118/0x140 kernel/signal.c:2354 ptrace_report_syscall include/linux/ptrace.h:420 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:482 [inline] syscall_exit_work kernel/entry/common.c:251 [inline] syscall_exit_to_user_mode_prepare+0x129/0x280 kernel/entry/common.c:278 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0xd/0x50 kernel/entry/common.c:296 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff8880735912f0 which belongs to the cache fat_inode_cache of size 1488 The buggy address is located 696 bytes inside of 1488-byte region [ffff8880735912f0, ffff8880735918c0) The buggy address belongs to the physical page: page:ffffea0001cd6400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x73590 head:ffffea0001cd6400 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888019022a00 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080140014 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_RECLAIMABLE), pid 5297, tgid 5297 (syz-executor364), ts 54461406303, free_ts 14487442433 prep_new_page mm/page_alloc.c:2561 [inline] get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4310 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5569 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285 alloc_slab_page mm/slub.c:1833 [inline] allocate_slab+0x25e/0x350 mm/slub.c:1980 new_slab mm/slub.c:2033 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3211 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3310 slab_alloc_node mm/slub.c:3395 [inline] slab_alloc mm/slub.c:3441 [inline] __kmem_cache_alloc_lru mm/slub.c:3448 [inline] kmem_cache_alloc_lru+0x4db/0x760 mm/slub.c:3464 alloc_inode_sb include/linux/fs.h:3090 [inline] fat_alloc_inode+0x27/0x1f0 fs/fat/inode.c:750 alloc_inode+0x61/0x230 fs/inode.c:259 new_inode_pseudo fs/inode.c:1018 [inline] new_inode+0x2b/0x280 fs/inode.c:1046 fat_fill_super+0x1b64/0x3680 fs/fat/inode.c:1847 mount_bdev+0x351/0x410 fs/super.c:1401 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x2f0 fs/super.c:1531 do_new_mount fs/namespace.c:3145 [inline] path_mount+0x132a/0x1e20 fs/namespace.c:3475 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3696 [inline] __se_sys_mount fs/namespace.c:3673 [inline] __x64_sys_mount+0x283/0x300 fs/namespace.c:3673 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1468 [inline] free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1518 free_unref_page_prepare mm/page_alloc.c:3409 [inline] free_unref_page+0x1d/0x4d0 mm/page_alloc.c:3505 free_contig_range+0xb5/0x180 mm/page_alloc.c:9498 destroy_args+0xa8/0x64c mm/debug_vm_pgtable.c:998 debug_vm_pgtable+0x28de/0x296f mm/debug_vm_pgtable.c:1318 do_one_initcall+0x141/0x790 init/main.c:1306 do_initcall_level init/main.c:1379 [inline] do_initcalls init/main.c:1395 [inline] do_basic_setup init/main.c:1414 [inline] kernel_init_freeable+0x6f9/0x782 init/main.c:1634 kernel_init+0x1e/0x1d0 init/main.c:1522 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff888073591480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888073591500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888073591580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888073591600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888073591680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================