loop8: detected capacity change from 0 to 2048 EXT4-fs (loop8): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: none. ================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1331/0x3ea0 fs/ext4/xattr.c:1735 Read of size 18446744073709551600 at addr ffff88804e09aeb8 by task syz.8.4870/29786 CPU: 0 PID: 29786 Comm: syz.8.4870 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x188/0x250 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+0x235/0x290 mm/kasan/generic.c:189 memmove+0x25/0x60 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0x1331/0x3ea0 fs/ext4/xattr.c:1735 ext4_xattr_ibody_set+0x112/0x330 fs/ext4/xattr.c:2237 ext4_destroy_inline_data_nolock+0x237/0x5e0 fs/ext4/inline.c:467 ext4_destroy_inline_data+0x7f/0xe0 fs/ext4/inline.c:1901 ext4_writepages+0x670/0x2df0 fs/ext4/inode.c:2735 do_writepages+0x476/0x6e0 mm/page-writeback.c:2386 filemap_fdatawrite_wbc+0x1eb/0x240 mm/filemap.c:400 __filemap_fdatawrite_range mm/filemap.c:433 [inline] file_write_and_wait_range+0x14d/0x220 mm/filemap.c:810 ext4_sync_file+0x1ff/0xae0 fs/ext4/fsync.c:151 generic_write_sync include/linux/fs.h:2990 [inline] ext4_buffered_write_iter+0x338/0x3b0 fs/ext4/file.c:275 ext4_file_write_iter+0x74d/0x1700 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2173 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x745/0xd60 fs/read_write.c:594 ksys_write+0x152/0x260 fs/read_write.c:647 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: 0033:0x7f0b25156eb9 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:00007f0b233b2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f0b253d1fa0 RCX: 00007f0b25156eb9 RDX: 0000000000000b71 RSI: 0000200000002480 RDI: 0000000000000004 RBP: 00007f0b251c4c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0b253d2038 R14: 00007f0b253d1fa0 R15: 00007ffdcac7ed68 The buggy address belongs to the page: page:ffffea0001382680 refcount:2 mapcount:0 mapping:ffff88801709c370 index:0x2 pfn:0x4e09a memcg:ffff88802858c000 aops:def_blk_aops ino:700008 flags: 0xfff0000000203e(referenced|uptodate|dirty|lru|active|private|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff0000000203e ffffea0000baa8c8 ffff88804d682030 ffff88801709c370 raw: 0000000000000002 ffff888060b630e8 00000002ffffffff ffff88802858c000 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 29786, ts 1779918287667, free_ts 1776879887998 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1bbd/0x1ca0 mm/page_alloc.c:4192 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5487 __page_cache_alloc+0xce/0x440 mm/filemap.c:1022 pagecache_get_page+0x9b6/0xf10 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+0x247/0xb60 fs/buffer.c:1336 sb_getblk include/linux/buffer_head.h:361 [inline] __ext4_get_inode_loc+0x46e/0xcd0 fs/ext4/inode.c:4332 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4440 [inline] __ext4_iget+0x448/0x3e50 fs/ext4/inode.c:4695 ext4_fill_super+0x73d4/0x95a0 fs/ext4/super.c:4866 mount_bdev+0x287/0x3c0 fs/super.c:1400 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x24a/0xa40 fs/namespace.c:3034 do_mount fs/namespace.c:3377 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3562 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+0x119/0x820 mm/page_alloc.c:3433 release_pages+0x186c/0x1be0 mm/swap.c:963 __pagevec_release+0x6d/0xe0 mm/swap.c:983 pagevec_release include/linux/pagevec.h:81 [inline] shmem_undo_range+0x62b/0x1930 mm/shmem.c:964 shmem_truncate_range mm/shmem.c:1063 [inline] shmem_evict_inode+0x220/0xa40 mm/shmem.c:1145 evict+0x4c9/0x8d0 fs/inode.c:647 __dentry_kill+0x431/0x650 fs/dcache.c:586 dentry_kill+0xb8/0x290 fs/dcache.c:-1 dput+0xd8/0x1a0 fs/dcache.c:893 __fput+0x5ee/0x930 fs/file_table.c:319 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xee/0x180 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 Memory state around the buggy address: ffff88804e09ad80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804e09ae00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88804e09ae80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88804e09af00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804e09af80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================