RBP: 00007ffc748898e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffc7488a9d0 R13: 00005555861d8700 R14: 0000000000000001 R15: 431bde82d7b634db ---[ end trace d8f6aa875f319ce5 ]--- ================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xa6/0x120 lib/list_debug.c:62 Read of size 8 at addr ffff8881dcf54a10 by task syz-executor186/342 CPU: 1 PID: 342 Comm: syz-executor186 Tainted: G W 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack+0x1e/0x20 lib/dump_stack.c:77 dump_stack+0x15b/0x1b8 lib/dump_stack.c:118 print_address_description+0x8d/0x4c0 mm/kasan/report.c:384 __kasan_report+0xef/0x120 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 __list_del_entry_valid+0xa6/0x120 lib/list_debug.c:62 __list_del_entry include/linux/list.h:131 [inline] list_del_init include/linux/list.h:190 [inline] f2fs_inode_synced+0xf4/0x2d0 fs/f2fs/super.c:1363 f2fs_update_inode+0x77/0x1aa0 fs/f2fs/inode.c:589 f2fs_update_inode_page fs/f2fs/inode.c:703 [inline] f2fs_write_inode+0x5a1/0x8c0 fs/f2fs/inode.c:731 write_inode fs/fs-writeback.c:1326 [inline] __writeback_single_inode+0x4e2/0xc30 fs/fs-writeback.c:1524 writeback_single_inode+0x216/0x630 fs/fs-writeback.c:1578 sync_inode fs/fs-writeback.c:2591 [inline] sync_inode_metadata+0xa8/0xf0 fs/fs-writeback.c:2611 f2fs_sync_inode_meta+0x167/0x280 fs/f2fs/checkpoint.c:1141 block_operations fs/f2fs/checkpoint.c:1246 [inline] f2fs_write_checkpoint+0x9f0/0x1c50 fs/f2fs/checkpoint.c:1630 kill_f2fs_super+0x231/0x390 fs/f2fs/super.c:4342 deactivate_locked_super+0xa0/0x100 fs/super.c:335 deactivate_super+0x14f/0x1d0 fs/super.c:366 cleanup_mnt+0x446/0x500 fs/namespace.c:1102 __cleanup_mnt+0x19/0x20 fs/namespace.c:1109 task_work_run+0x146/0x170 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xa43/0x2660 kernel/exit.c:861 do_group_exit+0x13e/0x300 kernel/exit.c:984 __do_sys_exit_group kernel/exit.c:995 [inline] __se_sys_exit_group kernel/exit.c:993 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:993 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f6b76d90e49 Code: Bad RIP value. RSP: 002b:00007ffc748886d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f6b76d90e49 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001 RBP: 00007f6b76e20370 R08: ffffffffffffffb8 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000246 R12: 00007f6b76e20370 R13: 0000000000000000 R14: 00007f6b76e22140 R15: 00007f6b76d5ec40 Allocated by task 344: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x162/0x200 mm/kasan/common.c:529 kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:537 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xe2/0x270 mm/slub.c:2842 f2fs_alloc_inode+0x26/0x3b0 fs/f2fs/super.c:1241 alloc_inode fs/inode.c:231 [inline] iget_locked+0x144/0x810 fs/inode.c:1273 f2fs_iget+0x55/0x4ac0 fs/f2fs/inode.c:499 f2fs_lookup+0x3ce/0xe00 fs/f2fs/namei.c:529 __lookup_slow+0x2cd/0x410 fs/namei.c:1748 lookup_slow+0x57/0x70 fs/namei.c:1765 walk_component+0x237/0x400 fs/namei.c:1885 lookup_last fs/namei.c:2348 [inline] path_lookupat+0x179/0x3f0 fs/namei.c:2393 filename_lookup+0x1bf/0x5f0 fs/namei.c:2423 user_path_at_empty+0x43/0x50 fs/namei.c:2703 user_path_at include/linux/namei.h:49 [inline] vfs_statx+0x116/0x200 fs/stat.c:187 vfs_lstat include/linux/fs.h:3383 [inline] __do_sys_newlstat fs/stat.c:353 [inline] __se_sys_newlstat+0xbe/0x330 fs/stat.c:347 __x64_sys_newlstat+0x5b/0x70 fs/stat.c:347 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 17: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x1c3/0x280 mm/kasan/common.c:487 kasan_slab_free+0xe/0x10 mm/kasan/common.c:496 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook+0xb7/0x180 mm/slub.c:1494 slab_free mm/slub.c:3080 [inline] kmem_cache_free+0x10c/0x2c0 mm/slub.c:3096 f2fs_free_inode+0x24/0x30 fs/f2fs/super.c:1397 i_callback+0x4c/0x70 fs/inode.c:220 __rcu_reclaim kernel/rcu/rcu.h:222 [inline] rcu_do_batch+0x446/0x980 kernel/rcu/tree.c:2167 rcu_core+0x4bd/0xbd0 kernel/rcu/tree.c:2387 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2396 __do_softirq+0x236/0x660 kernel/softirq.c:292 The buggy address belongs to the object at ffff8881dcf546b0 which belongs to the cache f2fs_inode_cache of size 1264 The buggy address is located 864 bytes inside of 1264-byte region [ffff8881dcf546b0, ffff8881dcf54ba0) The buggy address belongs to the page: page:ffffea000773d400 refcount:1 mapcount:0 mapping:ffff8881f0fd6f00 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f0fd6f00 raw: 0000000000000000 0000000080170017 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) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x35e/0x370 mm/page_alloc.c:2171 get_page_from_freelist+0x1296/0x1310 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x202/0x4b0 mm/page_alloc.c:4894 alloc_slab_page+0x3c/0x3b0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x93/0x420 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x29e/0x420 mm/slub.c:2667 __slab_alloc+0x63/0xa0 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0x12c/0x270 mm/slub.c:2842 f2fs_alloc_inode+0x26/0x3b0 fs/f2fs/super.c:1241 alloc_inode fs/inode.c:231 [inline] iget_locked+0x144/0x810 fs/inode.c:1273 f2fs_iget+0x55/0x4ac0 fs/f2fs/inode.c:499 f2fs_fill_super+0x44fc/0x7760 fs/f2fs/super.c:3963 mount_bdev+0x279/0x390 fs/super.c:1428 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4316 legacy_get_tree+0xea/0x190 fs/fs_context.c:648 vfs_get_tree+0x89/0x260 fs/super.c:1558 page_owner free stack trace missing Memory state around the buggy address: ffff8881dcf54900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881dcf54980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881dcf54a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881dcf54a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881dcf54b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================