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BUG: KASAN: use-after-free in data_blkaddr fs/f2fs/f2fs.h:2699 [inline]
BUG: KASAN: use-after-free in is_alive fs/f2fs/gc.c:1030 [inline]
BUG: KASAN: use-after-free in gc_data_segment fs/f2fs/gc.c:1448 [inline]
BUG: KASAN: use-after-free in do_garbage_collect+0x5b28/0x7160 fs/f2fs/gc.c:1653
Read of size 4 at addr ffff8881e1f45124 by task kworker/u4:1/6604

CPU: 1 PID: 6604 Comm: kworker/u4:1 Not tainted 5.4.210-syzkaller-00073-gd87b38e6be0f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: writeback wb_workfn (flush-7:2)
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18e/0x1d5 lib/dump_stack.c:118
 print_address_description+0x8c/0x630 mm/kasan/report.c:384
 __kasan_report+0xf6/0x130 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 data_blkaddr fs/f2fs/f2fs.h:2699 [inline]
 is_alive fs/f2fs/gc.c:1030 [inline]
 gc_data_segment fs/f2fs/gc.c:1448 [inline]
 do_garbage_collect+0x5b28/0x7160 fs/f2fs/gc.c:1653
 f2fs_gc+0x872/0x17f0 fs/f2fs/gc.c:1745
 f2fs_balance_fs+0x2c2/0x340 fs/f2fs/segment.c:528
 f2fs_write_single_data_page+0xe65/0x1920 fs/f2fs/data.c:2868
 f2fs_write_cache_pages fs/f2fs/data.c:3083 [inline]
 __f2fs_write_data_pages+0x15a6/0x2a30 fs/f2fs/data.c:3234
 do_writepages+0xda/0x1f0 mm/page-writeback.c:2344
 __writeback_single_inode+0xc5/0x840 fs/fs-writeback.c:1467
 writeback_sb_inodes+0x9a9/0x19d0 fs/fs-writeback.c:1730
 wb_writeback+0x3c2/0xc20 fs/fs-writeback.c:1905
 wb_do_writeback+0x181/0xaf0 fs/fs-writeback.c:2050
 wb_workfn+0xf8/0x450 fs/fs-writeback.c:2091
 process_one_work+0x6ca/0xc40 kernel/workqueue.c:2287
 worker_thread+0xae0/0x1440 kernel/workqueue.c:2433
 kthread+0x2d8/0x360 kernel/kthread.c:288
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 155:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 __kasan_kmalloc+0x131/0x1e0 mm/kasan/common.c:529
 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+0xd0/0x210 mm/slub.c:2842
 getname_flags+0xb8/0x4e0 fs/namei.c:141
 do_sys_open+0x2a3/0x700 fs/open.c:1107
 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 155:
 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+0x178/0x240 mm/kasan/common.c:487
 slab_free_hook mm/slub.c:1455 [inline]
 slab_free_freelist_hook+0x80/0x150 mm/slub.c:1494
 slab_free mm/slub.c:3080 [inline]
 kmem_cache_free+0xa9/0x1d0 mm/slub.c:3096
 do_sys_open+0x59a/0x700 fs/open.c:1122
 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff8881e1f44400
 which belongs to the cache names_cache of size 4096
The buggy address is located 3364 bytes inside of
 4096-byte region [ffff8881e1f44400, ffff8881e1f45400)
The buggy address belongs to the page:
page:ffffea000787d000 refcount:1 mapcount:0 mapping:ffff8881f5cf8000 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5cf8000
raw: 0000000000000000 0000000000070007 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+0x194/0x380 mm/page_alloc.c:2171
 get_page_from_freelist+0x524/0x560 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x2ab/0x6f0 mm/page_alloc.c:4857
 alloc_slab_page+0x39/0x3e0 mm/slub.c:343
 allocate_slab mm/slub.c:1683 [inline]
 new_slab+0x97/0x450 mm/slub.c:1749
 new_slab_objects mm/slub.c:2505 [inline]
 ___slab_alloc+0x320/0x4a0 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+0x100/0x210 mm/slub.c:2842
 getname_flags+0xb8/0x4e0 fs/namei.c:141
 do_sys_open+0x2a3/0x700 fs/open.c:1107
 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
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_pages_ok+0x7ee/0x920 mm/page_alloc.c:1438
 free_the_page mm/page_alloc.c:4919 [inline]
 __free_pages+0x45/0x1e0 mm/page_alloc.c:4925
 __free_slab+0x22b/0x2e0 mm/slub.c:1774
 __slab_free+0x362/0x370 mm/slub.c:3012
 qlist_free_all+0x4c/0xb0 mm/kasan/quarantine.c:167
 quarantine_reduce+0x174/0x190 mm/kasan/quarantine.c:260
 __kasan_kmalloc+0x43/0x1e0 mm/kasan/common.c:507
 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+0xd0/0x210 mm/slub.c:2842
 getname_flags+0xb8/0x4e0 fs/namei.c:141
 user_path_at_empty+0x28/0x50 fs/namei.c:2683
 user_path_at include/linux/namei.h:49 [inline]
 vfs_statx+0xd2/0x1a0 fs/stat.c:187
 vfs_fstatat include/linux/fs.h:3367 [inline]
 __do_sys_newfstatat fs/stat.c:367 [inline]
 __se_sys_newfstatat+0x60/0x6e0 fs/stat.c:361
 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Memory state around the buggy address:
 ffff8881e1f45000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881e1f45080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881e1f45100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff8881e1f45180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881e1f45200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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