WARNING: The mand mount option has been deprecated and
         and is ignored by this kernel. Remove the mand
         option from the mount to silence this warning.
=======================================================
EXT4-fs (loop2): mounted filesystem without journal. Opts: nombcache,journal_dev=0x00000000000000ff,nombcache,nobarrier,init_itable,errors=remount-ro,. Quota mode: none.
==================================================================
BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1e04/0x3940 fs/ext4/xattr.c:1727
Read of size 18446744073709551460 at addr ffff88812d45f49c by task syz.2.17/373

CPU: 1 PID: 373 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0xf1/0x140 mm/kasan/report.c:444
 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+0x1e04/0x3940 fs/ext4/xattr.c:1727
 ext4_xattr_block_set+0x4f8/0x2d10 fs/ext4/xattr.c:1936
 ext4_xattr_set_handle+0xbc4/0x12b0 fs/ext4/xattr.c:2422
 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2523
 ext4_xattr_trusted_set+0x3c/0x50 fs/ext4/xattr_trusted.c:38
 __vfs_setxattr+0x3e1/0x430 fs/xattr.c:182
 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216
 __vfs_setxattr_locked+0x212/0x230 fs/xattr.c:277
 vfs_setxattr+0x167/0x2e0 fs/xattr.c:303
 do_setxattr fs/xattr.c:588 [inline]
 setxattr+0x36c/0x390 fs/xattr.c:611
 path_setxattr+0x147/0x290 fs/xattr.c:630
 __do_sys_lsetxattr fs/xattr.c:653 [inline]
 __se_sys_lsetxattr fs/xattr.c:649 [inline]
 __x64_sys_lsetxattr+0xc2/0xe0 fs/xattr.c:649
 x64_sys_call+0x8cc/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:190
 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: 0033:0x7f855a84bcb9
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:00007ffd2ad8d1d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 00007f855aac6fa0 RCX: 00007f855a84bcb9
RDX: 00002000000001c0 RSI: 00002000000000c0 RDI: 0000200000000280
RBP: 00007f855a8b9bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f855aac6fac R14: 00007f855aac6fa0 R15: 00007f855aac6fa0
 </TASK>

The buggy address belongs to the page:
page:ffffea0004b517c0 refcount:2 mapcount:0 mapping:ffff8881092c7a18 index:0x1c pfn:0x12d45f
memcg:ffff888100255640
aops:def_blk_aops ino:700002
flags: 0x400000000000203a(referenced|dirty|lru|active|private|zone=1)
raw: 400000000000203a ffffea0004909148 ffffea00045f1948 ffff8881092c7a18
raw: 000000000000001c ffff888120ec3498 00000002ffffffff ffff888100255640
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 373, ts 34891918630, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x2d3a/0x2dc0 mm/page_alloc.c:4485
 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5808
 __alloc_pages_node include/linux/gfp.h:595 [inline]
 alloc_pages_node include/linux/gfp.h:609 [inline]
 alloc_pages include/linux/gfp.h:622 [inline]
 __page_cache_alloc include/linux/pagemap.h:305 [inline]
 pagecache_get_page+0xac6/0xde0 mm/filemap.c:1955
 find_or_create_page include/linux/pagemap.h:418 [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+0x238/0x7d0 fs/buffer.c:1336
 sb_getblk include/linux/buffer_head.h:361 [inline]
 ext4_xattr_block_set+0x1d7c/0x2d10 fs/ext4/xattr.c:2117
 ext4_xattr_set_handle+0xbc4/0x12b0 fs/ext4/xattr.c:2422
 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2523
 ext4_xattr_trusted_set+0x3c/0x50 fs/ext4/xattr_trusted.c:38
 __vfs_setxattr+0x3e1/0x430 fs/xattr.c:182
 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216
 __vfs_setxattr_locked+0x212/0x230 fs/xattr.c:277
 vfs_setxattr+0x167/0x2e0 fs/xattr.c:303
 do_setxattr fs/xattr.c:588 [inline]
 setxattr+0x36c/0x390 fs/xattr.c:611
 path_setxattr+0x147/0x290 fs/xattr.c:630
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88812d45f380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88812d45f400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88812d45f480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                            ^
 ffff88812d45f500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88812d45f580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================