================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0x80/0x120 lib/list_debug.c:59 Read of size 8 at addr ffff8881b451a398 by task kworker/u4:1/92 CPU: 0 PID: 92 Comm: kworker/u4:1 Not tainted 5.4.233-syzkaller-00032-g21086923c1e6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Workqueue: writeback wb_workfn (flush-7:2) Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 print_address_description+0x8c/0x600 mm/kasan/report.c:384 __kasan_report+0xf3/0x120 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 __list_del_entry_valid+0x80/0x120 lib/list_debug.c:59 __list_del_entry include/linux/list.h:131 [inline] list_del_init include/linux/list.h:190 [inline] __remove_dirty_inode fs/f2fs/checkpoint.c:1015 [inline] f2fs_remove_dirty_inode+0x214/0x3e0 fs/f2fs/checkpoint.c:1051 __f2fs_write_data_pages fs/f2fs/data.c:3247 [inline] f2fs_write_data_pages+0x24b5/0x2c20 fs/f2fs/data.c:3261 do_writepages+0x12b/0x270 mm/page-writeback.c:2344 __writeback_single_inode+0xd9/0xcc0 fs/fs-writeback.c:1467 writeback_sb_inodes+0xa2c/0x1990 fs/fs-writeback.c:1730 wb_writeback+0x403/0xd70 fs/fs-writeback.c:1905 wb_do_writeback fs/fs-writeback.c:2050 [inline] wb_workfn+0x3a9/0x10c0 fs/fs-writeback.c:2091 process_one_work+0x765/0xd20 kernel/workqueue.c:2287 worker_thread+0xaef/0x1470 kernel/workqueue.c:2433 kthread+0x2da/0x360 kernel/kthread.c:288 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354 Allocated by task 20064: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x130/0x1d0 mm/kasan/common.c:529 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] f2fs_fill_super+0xc8/0x8310 fs/f2fs/super.c:3818 mount_bdev+0x22e/0x340 fs/super.c:1417 legacy_get_tree+0xdf/0x170 fs/fs_context.c:647 vfs_get_tree+0x85/0x260 fs/super.c:1547 do_new_mount+0x292/0x570 fs/namespace.c:2843 do_mount+0x688/0xdd0 fs/namespace.c:3163 ksys_mount+0xc2/0xf0 fs/namespace.c:3372 __do_sys_mount fs/namespace.c:3386 [inline] __se_sys_mount fs/namespace.c:3383 [inline] __x64_sys_mount+0xb1/0xc0 fs/namespace.c:3383 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 320: 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+0x178/0x230 mm/kasan/common.c:487 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook mm/slub.c:1494 [inline] slab_free mm/slub.c:3080 [inline] kfree+0xeb/0x320 mm/slub.c:4071 f2fs_put_super+0xb3b/0xcd0 fs/f2fs/super.c:1522 generic_shutdown_super+0x121/0x2a0 fs/super.c:464 kill_block_super+0x7a/0xe0 fs/super.c:1444 kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4355 deactivate_locked_super+0xa8/0x110 fs/super.c:335 deactivate_super+0x1e2/0x2a0 fs/super.c:366 cleanup_mnt+0x419/0x4d0 fs/namespace.c:1102 task_work_run+0x140/0x170 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x18b/0x1a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 The buggy address belongs to the object at ffff8881b451a000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 920 bytes inside of 4096-byte region [ffff8881b451a000, ffff8881b451b000) The buggy address belongs to the page: page:ffffea0006d14600 refcount:1 mapcount:0 mapping:ffff8881f5c0c280 index:0xffff8881b451a000 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 ffffea0007b73208 ffffea00076e1408 ffff8881f5c0c280 raw: ffff8881b451a000 0000000000040001 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x18f/0x370 mm/page_alloc.c:2171 get_page_from_freelist+0x2ce8/0x2d70 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4891 alloc_slab_page+0x39/0x3c0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x97/0x440 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x2fe/0x490 mm/slub.c:2667 __slab_alloc+0x5a/0x90 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc_trace+0x128/0x240 mm/slub.c:2854 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] uevent_show+0x158/0x2e0 drivers/base/core.c:1938 dev_attr_show+0x50/0xb0 drivers/base/core.c:1647 sysfs_kf_seq_show+0x265/0x3e0 fs/sysfs/file.c:61 seq_read+0x4df/0xe60 fs/seq_file.c:232 __vfs_read+0x103/0x730 fs/read_write.c:425 vfs_read+0x148/0x360 fs/read_write.c:461 ksys_read+0x199/0x2c0 fs/read_write.c:587 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] free_pcp_prepare mm/page_alloc.c:1233 [inline] free_unref_page_prepare+0x297/0x380 mm/page_alloc.c:3085 free_unref_page_list+0x10a/0x590 mm/page_alloc.c:3154 release_pages+0xa06/0xa40 mm/swap.c:842 __pagevec_release+0xc3/0x150 mm/swap.c:862 pagevec_release include/linux/pagevec.h:88 [inline] truncate_inode_pages_range+0x7b7/0x1620 mm/truncate.c:367 evict+0x2af/0x6a0 fs/inode.c:577 __dentry_kill+0x429/0x630 fs/dcache.c:579 shrink_dentry_list+0x34a/0x490 fs/dcache.c:1122 shrink_dcache_parent+0xc9/0x330 fs/dcache.c:1548 do_one_tree+0x23/0xe0 fs/dcache.c:1603 shrink_dcache_for_umount+0x79/0x130 fs/dcache.c:1620 generic_shutdown_super+0x66/0x2a0 fs/super.c:447 kill_anon_super fs/super.c:1108 [inline] kill_litter_super+0x72/0xa0 fs/super.c:1117 deactivate_locked_super+0xa8/0x110 fs/super.c:335 deactivate_super+0x1e2/0x2a0 fs/super.c:366 cleanup_mnt+0x419/0x4d0 fs/namespace.c:1102 Memory state around the buggy address: ffff8881b451a280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881b451a300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881b451a380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881b451a400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881b451a480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================