loop5: detected capacity change from 0 to 1024 EXT4-fs (loop5): 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:1736 Read of size 18446744073709551600 at addr ffff888055c0d2d0 by task syz.5.2419/16376 CPU: 0 PID: 16376 Comm: syz.5.2419 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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:1736 ext4_xattr_ibody_set+0x112/0x330 fs/ext4/xattr.c:2238 ext4_destroy_inline_data_nolock+0x237/0x5e0 fs/ext4/inline.c:467 ext4_convert_inline_data_to_extent fs/ext4/inline.c:619 [inline] ext4_try_to_write_inline_data+0x72f/0x14f0 fs/ext4/inline.c:760 ext4_write_begin+0x26e/0x15d0 fs/ext4/inode.c:1181 ext4_da_write_begin+0x43b/0xb40 fs/ext4/inode.c:2975 generic_perform_write+0x2b6/0x550 mm/filemap.c:3785 ext4_buffered_write_iter+0x25f/0x3b0 fs/ext4/file.c:268 ext4_file_write_iter+0x74d/0x1700 fs/ext4/file.c:-1 do_iter_readv_writev+0x47e/0x5f0 fs/read_write.c:-1 do_iter_write+0x205/0x7b0 fs/read_write.c:855 vfs_writev fs/read_write.c:928 [inline] do_pwritev+0x240/0x3a0 fs/read_write.c:1025 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: 0033:0x7f12d7963f79 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:00007f12d5bbe028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007f12d7bddfa0 RCX: 00007f12d7963f79 RDX: 0000000000000001 RSI: 00002000000001c0 RDI: 0000000000000004 RBP: 00007f12d79fa7e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000e7b R11: 0000000000000246 R12: 0000000000000000 R13: 00007f12d7bde038 R14: 00007f12d7bddfa0 R15: 00007ffea78191b8 The buggy address belongs to the page: page:ffffea0001570340 refcount:3 mapcount:1 mapping:ffff8881408888b0 index:0x2 pfn:0x55c0d memcg:ffff88807d058000 aops:def_blk_aops ino:700005 flags: 0xfff0000002203e(referenced|uptodate|dirty|lru|active|private|mappedtodisk|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff0000002203e ffffea00015e2a48 ffff888022c00030 ffff8881408888b0 raw: 0000000000000002 ffff88805f20e570 0000000300000000 ffff88807d058000 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 16376, ts 625959349897, free_ts 623441029089 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_lookup+0x4b4/0x960 fs/ext4/namei.c:1858 lookup_open fs/namei.c:3448 [inline] open_last_lookups fs/namei.c:3540 [inline] path_openat+0x1022/0x2fa0 fs/namei.c:3747 do_filp_open+0x1e2/0x410 fs/namei.c:3777 do_sys_openat2+0x150/0x4b0 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_openat fs/open.c:1287 [inline] __se_sys_openat fs/open.c:1282 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1282 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: ffff888055c0d180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888055c0d200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888055c0d280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888055c0d300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888055c0d380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================