incfs: Can't find or create .index dir in ./file0/../file0
incfs: mount failed -117
==================================================================
BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1159/0x3860 fs/ext4/xattr.c:1731
Read of size 18446744073709551600 at addr ffff888112c866b8 by task syz.4.14/369

CPU: 0 PID: 369 Comm: syz.4.14 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x100/0x140 mm/kasan/report.c:452
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189
 memmove+0x2d/0x70 mm/kasan/shadow.c:54
 ext4_xattr_set_entry+0x1159/0x3860 fs/ext4/xattr.c:1731
 ext4_xattr_ibody_set+0x114/0x330 fs/ext4/xattr.c:2231
 ext4_destroy_inline_data_nolock+0x20f/0x5e0 fs/ext4/inline.c:464
 ext4_convert_inline_data_to_extent fs/ext4/inline.c:629 [inline]
 ext4_try_to_write_inline_data+0x6df/0x11e0 fs/ext4/inline.c:769
 ext4_write_begin+0x25d/0x1730 fs/ext4/inode.c:1194
 generic_perform_write+0x2ce/0x540 mm/filemap.c:3509
 ext4_buffered_write_iter+0x48c/0x620 fs/ext4/file.c:271
 ext4_file_write_iter+0x49a/0x19a0 fs/ext4/file.c:-1
 call_write_iter include/linux/fs.h:2066 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x770/0xd70 fs/read_write.c:605
 ksys_pwrite64 fs/read_write.c:712 [inline]
 __do_sys_pwrite64 fs/read_write.c:722 [inline]
 __se_sys_pwrite64 fs/read_write.c:719 [inline]
 __x64_sys_pwrite64+0x194/0x220 fs/read_write.c:719
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f7bd3214e59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7bd1c6f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f7bd348dfa0 RCX: 00007f7bd3214e59
RDX: 00000000200000c1 RSI: 00002000000000c0 RDI: 0000000000000006
RBP: 00007f7bd32aae6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000009000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7bd348e038 R14: 00007f7bd348dfa0 R15: 00007ffefe4e0b58

The buggy address belongs to the page:
page:ffffea00044b2180 refcount:2 mapcount:0 mapping:ffff888109199390 index:0xc pfn:0x112c86
aops:def_blk_aops ino:0
flags: 0x400000000000203a(referenced|dirty|lru|active|private)
raw: 400000000000203a ffffea00043f8948 ffffea0004441848 ffff888109199390
raw: 000000000000000c ffff88811b3d6930 00000002ffffffff ffff8881280f0000
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8881280f0000
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 369, ts 29330572126, free_ts 29287198066
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x176/0x190 mm/page_alloc.c:2462
 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384
 __alloc_pages include/linux/gfp.h:544 [inline]
 __alloc_pages_node include/linux/gfp.h:557 [inline]
 alloc_pages_node include/linux/gfp.h:571 [inline]
 alloc_pages include/linux/gfp.h:590 [inline]
 __page_cache_alloc include/linux/pagemap.h:290 [inline]
 pagecache_get_page+0x63e/0x930 mm/filemap.c:1848
 find_or_create_page include/linux/pagemap.h:402 [inline]
 grow_dev_page fs/buffer.c:976 [inline]
 grow_buffers fs/buffer.c:1045 [inline]
 __getblk_slow fs/buffer.c:1072 [inline]
 __getblk_gfp+0x212/0x780 fs/buffer.c:1370
 sb_getblk include/linux/buffer_head.h:361 [inline]
 __ext4_get_inode_loc+0x45e/0xbf0 fs/ext4/inode.c:4456
 ext4_get_inode_loc fs/ext4/inode.c:4582 [inline]
 ext4_reserve_inode_write+0x16f/0x2f0 fs/ext4/inode.c:5962
 __ext4_mark_inode_dirty+0xb5/0x610 fs/ext4/inode.c:6137
 ext4_mkdir+0x4e0/0xc60 fs/ext4/namei.c:3017
 vfs_mkdir+0x42c/0x600 fs/namei.c:3798
 open_or_create_special_dir+0xea/0x1e0 fs/incfs/vfs.c:482
 incfs_mount_fs+0x434/0x8d0 fs/incfs/vfs.c:1867
 legacy_get_tree+0xed/0x190 fs/fs_context.c:593
 vfs_get_tree+0x89/0x260 fs/super.c:1572
 do_new_mount+0x25a/0xa30 fs/namespace.c:3006
 path_mount+0x581/0xca0 fs/namespace.c:3336
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 free_pcp_prepare mm/page_alloc.c:1421 [inline]
 free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336
 free_unref_page_list+0x129/0x9c0 mm/page_alloc.c:3443
 release_pages+0xe41/0xe90 mm/swap.c:1103
 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:356
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:240 [inline]
 tlb_flush_mmu+0xdf/0x190 mm/mmu_gather.c:247
 zap_pte_range mm/memory.c:1385 [inline]
 zap_pmd_range mm/memory.c:1435 [inline]
 zap_pud_range mm/memory.c:1464 [inline]
 zap_p4d_range mm/memory.c:1485 [inline]
 unmap_page_range+0x1d82/0x2190 mm/memory.c:1506
 unmap_single_vma mm/memory.c:1551 [inline]
 unmap_vmas+0x25f/0x360 mm/memory.c:1583
 exit_mmap+0x309/0x590 mm/mmap.c:3385
 __mmput+0x92/0x2d0 kernel/fork.c:1153
 mmput+0x4e/0x150 kernel/fork.c:1176
 exit_mm kernel/exit.c:540 [inline]
 do_exit+0x9d8/0x24e0 kernel/exit.c:860
 do_group_exit+0x149/0x310 kernel/exit.c:987
 __do_sys_exit_group kernel/exit.c:998 [inline]
 __se_sys_exit_group kernel/exit.c:996 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:996
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Memory state around the buggy address:
 ffff888112c86580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888112c86600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888112c86680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                        ^
 ffff888112c86700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888112c86780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================