================================================================== BUG: KASAN: use-after-free in inode_dirtied_after fs/fs-writeback.c:1370 [inline] BUG: KASAN: use-after-free in move_expired_inodes+0x181/0x890 fs/fs-writeback.c:1402 Read of size 8 at addr ffff88810f42c9a0 by task kworker/u4:0/8 CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted 5.15.78-syzkaller-00911-gc73b4619ad86 #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+0x151/0x1b7 lib/dump_stack.c:106 print_address_description+0x87/0x3d0 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x1a6/0x1f0 mm/kasan/report.c:452 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 inode_dirtied_after fs/fs-writeback.c:1370 [inline] move_expired_inodes+0x181/0x890 fs/fs-writeback.c:1402 queue_io+0x29f/0x500 fs/fs-writeback.c:1462 wb_writeback+0x3c3/0x9e0 fs/fs-writeback.c:2069 wb_check_old_data_flush fs/fs-writeback.c:2173 [inline] wb_do_writeback+0x995/0xbd0 fs/fs-writeback.c:2226 wb_workfn+0xf8/0x3e0 fs/fs-writeback.c:2255 process_one_work+0x6db/0xc00 kernel/workqueue.c:2313 worker_thread+0xb3e/0x1340 kernel/workqueue.c:2460 kthread+0x41c/0x500 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Allocated by task 409: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:466 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook mm/slab.h:550 [inline] slab_alloc_node mm/slub.c:3236 [inline] slab_alloc mm/slub.c:3244 [inline] kmem_cache_alloc+0x189/0x2f0 mm/slub.c:3249 fat_alloc_inode+0x1d/0xa0 fs/fat/inode.c:748 alloc_inode fs/inode.c:236 [inline] new_inode_pseudo+0x64/0x220 fs/inode.c:937 new_inode+0x28/0x1c0 fs/inode.c:966 fat_build_inode+0x1d9/0x3a0 fs/fat/inode.c:601 msdos_create+0x480/0x580 fs/fat/namei_msdos.c:292 lookup_open fs/namei.c:3334 [inline] open_last_lookups fs/namei.c:3404 [inline] path_openat+0x1323/0x2ea0 fs/namei.c:3612 do_filp_open+0x277/0x4f0 fs/namei.c:3642 do_sys_openat2+0x13b/0x500 fs/open.c:1234 do_sys_open fs/open.c:1250 [inline] __do_sys_open fs/open.c:1258 [inline] __se_sys_open fs/open.c:1254 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1254 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 0: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1721 [inline] slab_free_freelist_hook+0xc9/0x1a0 mm/slub.c:1747 slab_free mm/slub.c:3515 [inline] kmem_cache_free+0x11a/0x2e0 mm/slub.c:3531 fat_free_inode+0x20/0x30 fs/fat/inode.c:765 i_callback+0x4b/0x70 fs/inode.c:225 rcu_do_batch+0x55b/0xbe0 kernel/rcu/tree.c:2509 rcu_core+0x506/0x1000 kernel/rcu/tree.c:2749 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2762 __do_softirq+0x27e/0x5dc kernel/softirq.c:565 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2993 [inline] call_rcu+0x140/0x1400 kernel/rcu/tree.c:3073 destroy_inode fs/inode.c:291 [inline] evict+0x5de/0x630 fs/inode.c:602 iput_final fs/inode.c:1663 [inline] iput+0x61c/0x7d0 fs/inode.c:1689 dentry_unlink_inode+0x349/0x430 fs/dcache.c:376 __dentry_kill+0x3e2/0x5d0 fs/dcache.c:582 dentry_kill+0xc0/0x2a0 dput+0x175/0x320 fs/dcache.c:888 __fput+0x65a/0x910 fs/file_table.c:288 ____fput+0x15/0x20 fs/file_table.c:308 task_work_run+0x147/0x1b0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0x67e/0x24d0 kernel/exit.c:828 do_group_exit+0x13a/0x300 kernel/exit.c:925 __do_sys_exit_group kernel/exit.c:936 [inline] __se_sys_exit_group kernel/exit.c:934 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:934 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff88810f42c820 which belongs to the cache fat_inode_cache of size 912 The buggy address is located 384 bytes inside of 912-byte region [ffff88810f42c820, ffff88810f42cbb0) The buggy address belongs to the page: page:ffffea00043d0b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10f42c head:ffffea00043d0b00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff888103194180 raw: 0000000000000000 00000000800f000f 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Reclaimable, gfp_mask 0xd2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_RECLAIMABLE), pid 409, ts 20546236982, free_ts 0 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1ab/0x1b0 mm/page_alloc.c:2495 prep_new_page mm/page_alloc.c:2501 [inline] get_page_from_freelist+0x38b/0x400 mm/page_alloc.c:4281 __alloc_pages+0x3a8/0x7c0 mm/page_alloc.c:5548 allocate_slab+0x62/0x580 mm/slub.c:1928 new_slab mm/slub.c:1991 [inline] ___slab_alloc+0x2e2/0x6f0 mm/slub.c:3024 __slab_alloc+0x4a/0x90 mm/slub.c:3111 slab_alloc_node mm/slub.c:3202 [inline] slab_alloc mm/slub.c:3244 [inline] kmem_cache_alloc+0x205/0x2f0 mm/slub.c:3249 fat_alloc_inode+0x1d/0xa0 fs/fat/inode.c:748 alloc_inode fs/inode.c:236 [inline] new_inode_pseudo+0x64/0x220 fs/inode.c:937 new_inode+0x28/0x1c0 fs/inode.c:966 fat_fill_super+0x32c2/0x4b30 fs/fat/inode.c:1846 msdos_fill_super+0x2e/0x40 fs/fat/namei_msdos.c:655 mount_bdev+0x280/0x3b0 fs/super.c:1369 msdos_mount+0x34/0x40 fs/fat/namei_msdos.c:662 legacy_get_tree+0xf0/0x190 fs/fs_context.c:610 vfs_get_tree+0x88/0x290 fs/super.c:1499 page_owner free stack trace missing Memory state around the buggy address: ffff88810f42c880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810f42c900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88810f42c980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88810f42ca00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810f42ca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================