loop9: detected capacity change from 0 to 1024 EXT4-fs (loop9): mounted filesystem without journal. Opts: auto_da_alloc,minixdf,,errors=continue. Quota mode: none. ================================================================== BUG: KASAN: use-after-free in ext4_xattr_set_entry+0x1c3e/0x37d0 fs/ext4/xattr.c:1727 Read of size 6176 at addr ffff88814076c7e0 by task syz.9.2015/5992 CPU: 0 PID: 5992 Comm: syz.9.2015 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 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+0x280/0x290 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0x1c3e/0x37d0 fs/ext4/xattr.c:1727 ext4_xattr_block_set+0x4fc/0x2cb0 fs/ext4/xattr.c:1936 ext4_xattr_set_handle+0xbd5/0x12b0 fs/ext4/xattr.c:2422 ext4_xattr_set+0x22a/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+0x168/0x2f0 fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x2da/0x300 fs/xattr.c:611 path_setxattr+0x142/0x280 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: 0033:0x7fcdb9e86749 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:00007fcdb88ee038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 00007fcdba0dcfa0 RCX: 00007fcdb9e86749 RDX: 0000200000000440 RSI: 00002000000000c0 RDI: 0000200000000100 RBP: 00007fcdb9f0af91 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcdba0dd038 R14: 00007fcdba0dcfa0 R15: 00007ffeb73a1068 The buggy address belongs to the page: page:ffffea000501db00 refcount:2 mapcount:0 mapping:ffff88810930bc18 index:0x1c pfn:0x14076c memcg:ffff88811b220000 aops:def_blk_aops ino:700009 flags: 0x400000000000203a(referenced|dirty|lru|active|private|zone=1) raw: 400000000000203a ffffea0004c36508 ffffea0005044e08 ffff88810930bc18 raw: 000000000000001c ffff88812b892690 00000002ffffffff ffff88811b220000 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 5992, ts 182210552745, free_ts 182210183607 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+0x2cc5/0x2d50 mm/page_alloc.c:4485 __alloc_pages+0x18f/0x440 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+0xa82/0xda0 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+0x198c/0x2cb0 fs/ext4/xattr.c:2117 ext4_xattr_set_handle+0xbd5/0x12b0 fs/ext4/xattr.c:2422 ext4_xattr_set+0x22a/0x320 fs/ext4/xattr.c:2523 ext4_xattr_user_set+0xc4/0xf0 fs/ext4/xattr_user.c:41 __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+0x168/0x2f0 fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x2da/0x300 fs/xattr.c:611 path_setxattr+0x142/0x280 fs/xattr.c:630 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534 free_unref_page_list+0x134/0x9d0 mm/page_alloc.c:3671 release_pages+0xfda/0x1030 mm/swap.c:1014 pagevec_lru_move_fn+0x3ec/0x490 mm/swap.c:203 activate_page+0x3db/0x500 mm/swap.c:338 mark_page_accessed+0x321/0x8d0 mm/swap.c:462 pagecache_get_page+0x7d8/0xda0 mm/filemap.c:1938 find_get_page_flags include/linux/pagemap.h:355 [inline] __find_get_block_slow fs/buffer.c:202 [inline] __find_get_block+0x294/0xee0 fs/buffer.c:1310 __getblk_gfp+0x30/0x7d0 fs/buffer.c:1332 sb_getblk_gfp include/linux/buffer_head.h:368 [inline] ext4_sb_breadahead_unmovable+0x6b/0xe0 fs/ext4/super.c:238 __ext4_get_inode_loc+0x97b/0xcd0 fs/ext4/inode.c:4441 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4471 [inline] __ext4_iget+0x44a/0x3e40 fs/ext4/inode.c:4721 ext4_lookup+0x3b9/0x840 fs/ext4/namei.c:1858 __lookup_slow+0x2aa/0x3e0 fs/namei.c:1671 lookup_slow+0x57/0x70 fs/namei.c:1688 walk_component+0x325/0x460 fs/namei.c:1984 Memory state around the buggy address: ffff88814076cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88814076cf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88814076d000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88814076d080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88814076d100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================