loop1: detected capacity change from 512 to 0 EXT4-fs error (device loop1): ext4_xattr_block_get:543: inode #15: comm syz.1.832: corrupted xattr block 33 ================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xaf2/0x21d0 fs/ext4/xattr.c:1708 Read of size 18446744073709551600 at addr ffff8881331ad300 by task syz.1.832/3066 CPU: 1 PID: 3066 Comm: syz.1.832 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x71/0x200 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:420 kasan_report+0x122/0x150 mm/kasan/report.c:524 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+0xaf2/0x21d0 fs/ext4/xattr.c:1708 ext4_xattr_ibody_set+0x24e/0x6c0 fs/ext4/xattr.c:2215 ext4_destroy_inline_data_nolock+0x234/0x5d0 fs/ext4/inline.c:468 ext4_convert_inline_data_nolock+0x3c0/0x9e0 fs/ext4/inline.c:1250 ext4_convert_inline_data+0x4b9/0x5f0 fs/ext4/inline.c:2119 ext4_fallocate+0xfd/0x1dc0 fs/ext4/extents.c:4761 vfs_fallocate+0x4c5/0x5a0 fs/open.c:324 ksys_fallocate fs/open.c:347 [inline] __do_sys_fallocate fs/open.c:355 [inline] __se_sys_fallocate fs/open.c:353 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:353 x64_sys_call+0x7fa/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:286 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f10ac19c819 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:00007f10acffb028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f10ac415fa0 RCX: 00007f10ac19c819 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000009 RBP: 00007f10ac232c91 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000001001f0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f10ac416038 R14: 00007f10ac415fa0 R15: 00007ffd9273a658 The buggy address belongs to the physical page: page:ffffea0004cc6b40 refcount:2 mapcount:0 mapping:ffff88810b2bfdd0 index:0x2 pfn:0x1331ad memcg:ffff88810023ba80 aops:def_blk_aops ino:700001 flags: 0x560000000000205a(referenced|dirty|lru|workingset|private|zone=1) raw: 560000000000205a ffffea0004f68048 ffffea000472e7c8 ffff88810b2bfdd0 raw: 0000000000000002 ffff888141322c78 00000002ffffffff ffff88810023ba80 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 3066, tgid 3065 (syz.1.832), ts 111836569588, free_ts 111828809536 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2670 prep_new_page+0x1c/0x110 mm/page_alloc.c:2677 get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4583 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5924 __folio_alloc+0x12/0x40 mm/page_alloc.c:5957 __folio_alloc_node include/linux/gfp.h:245 [inline] folio_alloc include/linux/gfp.h:274 [inline] filemap_alloc_folio include/linux/pagemap.h:515 [inline] __filemap_get_folio+0x6ee/0xa60 mm/filemap.c:2019 pagecache_get_page+0x2b/0x110 mm/folio-compat.c:110 find_or_create_page include/linux/pagemap.h:656 [inline] grow_dev_page fs/buffer.c:989 [inline] grow_buffers fs/buffer.c:1054 [inline] __getblk_slow fs/buffer.c:1081 [inline] __getblk_gfp+0x217/0x7d0 fs/buffer.c:1376 sb_getblk include/linux/buffer_head.h:356 [inline] __ext4_get_inode_loc+0x481/0xdf0 fs/ext4/inode.c:4520 ext4_get_inode_loc+0x81/0xf0 fs/ext4/inode.c:4648 ext4_xattr_ibody_get+0x122/0x4e0 fs/ext4/xattr.c:594 ext4_xattr_get+0x122/0x650 fs/ext4/xattr.c:655 ext4_xattr_security_get+0x32/0x40 fs/ext4/xattr_security.c:20 __vfs_getxattr+0x3b1/0x3e0 fs/xattr.c:407 cap_inode_need_killpriv+0x45/0x60 security/commoncap.c:301 security_inode_need_killpriv+0x73/0xa0 security/security.c:1436 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1578 [inline] free_pcp_prepare mm/page_alloc.c:1652 [inline] free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3618 free_unref_page_list+0x117/0x8c0 mm/page_alloc.c:3769 release_pages+0xaf2/0xb50 mm/swap.c:1048 __pagevec_release+0x71/0xe0 mm/swap.c:1068 pagevec_release include/linux/pagevec.h:71 [inline] folio_batch_release include/linux/pagevec.h:135 [inline] shmem_undo_range+0x574/0x1540 mm/shmem.c:951 shmem_truncate_range mm/shmem.c:1067 [inline] shmem_evict_inode+0x255/0xa50 mm/shmem.c:1176 evict+0x4d7/0x8f0 fs/inode.c:708 iput_final fs/inode.c:1844 [inline] iput+0x620/0x670 fs/inode.c:1870 dentry_unlink_inode+0x33d/0x3f0 fs/dcache.c:405 __dentry_kill+0x460/0x670 fs/dcache.c:611 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1 dput+0x42/0x80 fs/dcache.c:918 __fput+0x5be/0x8f0 fs/file_table.c:328 ____fput+0x15/0x20 fs/file_table.c:348 task_work_run+0x1e1/0x250 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177 Memory state around the buggy address: ffff8881331ad200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881331ad280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881331ad300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8881331ad380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881331ad400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================