EXT4-fs (loop4): mounted filesystem without journal. Opts: quota,nolazytime,barrier=0x0000000000000003,debug_want_extra_isize=0x0000000000000080,block_validity,jqfmt=vfsv1,,errors=continue. Quota mode: writeback.
EXT4-fs error (device loop4) in ext4_reserve_inode_write:5835: Corrupt filesystem
EXT4-fs error (device loop4): ext4_dirty_inode:6039: inode #15: comm syz.4.215: mark_inode_dirty error
==================================================================
BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1390/0x3d30 fs/ext4/xattr.c:1747
Read of size 18446744073709551576 at addr ffff8880570592d0 by task syz.4.215/5218

CPU: 1 PID: 5218 Comm: syz.4.215 Not tainted 5.15.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 print_address_description+0x60/0x2d0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xdf/0x130 mm/kasan/report.c:451
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x27b/0x290 mm/kasan/generic.c:189
 memmove+0x25/0x60 mm/kasan/shadow.c:54
 ext4_xattr_set_entry+0x1390/0x3d30 fs/ext4/xattr.c:1747
 ext4_xattr_ibody_set+0x112/0x330 fs/ext4/xattr.c:2252
 ext4_xattr_move_to_block fs/ext4/xattr.c:2639 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2707 [inline]
 ext4_expand_extra_isize_ea+0xf9a/0x19a0 fs/ext4/xattr.c:2799
 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:5886
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5929 [inline]
 __ext4_mark_inode_dirty+0x469/0x700 fs/ext4/inode.c:6007
 ext4_setattr+0x13b7/0x19e0 fs/ext4/inode.c:5548
 notify_change+0xbcd/0xee0 fs/attr.c:505
 do_truncate+0x197/0x220 fs/open.c:65
 handle_truncate fs/namei.c:3265 [inline]
 do_open fs/namei.c:3612 [inline]
 path_openat+0x28af/0x2f30 fs/namei.c:3742
 do_filp_open+0x1b3/0x3e0 fs/namei.c:3769
 do_sys_openat2+0x142/0x4a0 fs/open.c:1253
 do_sys_open fs/open.c:1269 [inline]
 __do_sys_creat fs/open.c:1345 [inline]
 __se_sys_creat fs/open.c:1339 [inline]
 __x64_sys_creat+0x8c/0xb0 fs/open.c:1339
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fa4b7bb3929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa4b5a1b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007fa4b7ddafa0 RCX: 00007fa4b7bb3929
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00002000000000c0
RBP: 00007fa4b7c35b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa4b7ddafa0 R15: 00007fff80befa38
 </TASK>

The buggy address belongs to the page:
page:ffffea00015c1640 refcount:2 mapcount:0 mapping:ffff88801cf09470 index:0x2 pfn:0x57059
memcg:ffff88807e00c000
aops:def_blk_aops ino:700004
flags: 0xfff00000002036(referenced|uptodate|lru|active|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002036 ffffea0001985808 ffffea0000ac5388 ffff88801cf09470
raw: 0000000000000002 ffff888060b479f8 00000002ffffffff ffff88807e00c000
page dumped because: kasan: bad access detected
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 5218, ts 103304461818, free_ts 103254009504
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192
 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5474
 __page_cache_alloc+0xd2/0x3f0 mm/filemap.c:1022
 pagecache_get_page+0x986/0xef0 mm/filemap.c:1940
 find_or_create_page include/linux/pagemap.h:420 [inline]
 grow_dev_page fs/buffer.c:949 [inline]
 grow_buffers fs/buffer.c:1014 [inline]
 __getblk_slow fs/buffer.c:1041 [inline]
 __getblk_gfp+0x249/0xb70 fs/buffer.c:1336
 sb_getblk include/linux/buffer_head.h:361 [inline]
 __ext4_get_inode_loc+0x461/0xcd0 fs/ext4/inode.c:4326
 ext4_get_inode_loc fs/ext4/inode.c:4450 [inline]
 ext4_reserve_inode_write+0x140/0x2e0 fs/ext4/inode.c:5825
 __ext4_mark_inode_dirty+0x142/0x700 fs/ext4/inode.c:6002
 __ext4_new_inode+0x30ba/0x39e0 fs/ext4/ialloc.c:1351
 ext4_create+0x22a/0x460 fs/ext4/namei.c:2883
 lookup_open fs/namei.c:3462 [inline]
 open_last_lookups fs/namei.c:3532 [inline]
 path_openat+0x11e1/0x2f30 fs/namei.c:3739
 do_filp_open+0x1b3/0x3e0 fs/namei.c:3769
 do_sys_openat2+0x142/0x4a0 fs/open.c:1253
 do_sys_open fs/open.c:1269 [inline]
 __do_sys_creat fs/open.c:1345 [inline]
 __se_sys_creat fs/open.c:1339 [inline]
 __x64_sys_creat+0x8c/0xb0 fs/open.c:1339
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
 free_unref_page_list+0x122/0x7e0 mm/page_alloc.c:3433
 release_pages+0x184b/0x1bb0 mm/swap.c:963
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:240 [inline]
 tlb_flush_mmu mm/mmu_gather.c:247 [inline]
 tlb_finish_mmu+0x164/0x2e0 mm/mmu_gather.c:338
 exit_mmap+0x3a6/0x5f0 mm/mmap.c:3206
 __mmput+0x115/0x3b0 kernel/fork.c:1127
 exit_mm+0x567/0x6c0 kernel/exit.c:550
 do_exit+0x599/0x20a0 kernel/exit.c:861
 do_group_exit+0x12e/0x300 kernel/exit.c:996
 get_signal+0x6ca/0x12c0 kernel/signal.c:2900
 arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Memory state around the buggy address:
 ffff888057059180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888057059200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888057059280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                 ^
 ffff888057059300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888057059380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================