================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xb02/0x2230 fs/ext4/xattr.c:1708 Read of size 18446744073709551600 at addr ffff88810920a2b8 by task syz.6.261/1159 CPU: 1 PID: 1159 Comm: syz.6.261 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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+0xb02/0x2230 fs/ext4/xattr.c:1708 ext4_xattr_ibody_set+0x25b/0x720 fs/ext4/xattr.c:2215 ext4_destroy_inline_data_nolock+0x234/0x5e0 fs/ext4/inline.c:468 ext4_convert_inline_data_to_extent fs/ext4/inline.c:620 [inline] ext4_try_to_write_inline_data+0x764/0x1330 fs/ext4/inline.c:761 ext4_write_begin+0x1f8/0xfc0 fs/ext4/inode.c:1207 ext4_da_write_begin+0x3ed/0x880 fs/ext4/inode.c:3003 generic_perform_write+0x32d/0x740 mm/filemap.c:3915 ext4_buffered_write_iter+0x38f/0x690 fs/ext4/file.c:285 ext4_file_write_iter+0x4b2/0x1540 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2282 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ef/0xd00 fs/read_write.c:584 ksys_write+0x14a/0x260 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:646 x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 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: 0033:0x7fd17c59de99 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:00007fd17d552028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fd17c825fa0 RCX: 00007fd17c59de99 RDX: 00000000ffffffd7 RSI: 0000200000000000 RDI: 000000000000000a RBP: 00007fd17c633eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd17c826038 R14: 00007fd17c825fa0 R15: 00007ffd892eddf8 The buggy address belongs to the physical page: page:ffffea0004248280 refcount:3 mapcount:1 mapping:ffff88810b6f3a50 index:0x2 pfn:0x10920a memcg:ffff888112d04440 aops:def_blk_aops ino:700006 flags: 0x560000000002205e(referenced|uptodate|dirty|lru|workingset|private|mappedtodisk|zone=1) raw: 560000000002205e ffffea0005098008 ffffea0004d069c8 ffff88810b6f3a50 raw: 0000000000000002 ffff888116de8bd0 0000000300000000 ffff888112d04440 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x148c40(GFP_NOFS|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL), pid 1159, tgid 1158 (syz.6.261), ts 62492053132, free_ts 62327678944 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672 prep_new_page+0x1c/0x110 mm/page_alloc.c:2679 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4586 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930 __folio_alloc+0x12/0x40 mm/page_alloc.c:5963 __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+0x6fe/0xa70 mm/filemap.c:2021 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+0x211/0x7c0 fs/buffer.c:1376 sb_getblk_gfp include/linux/buffer_head.h:363 [inline] ext4_sb_breadahead_unmovable+0x6b/0xe0 fs/ext4/super.c:258 __ext4_get_inode_loc+0x953/0xd60 fs/ext4/inode.c:4610 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4640 [inline] __ext4_iget+0x448/0x3e70 fs/ext4/inode.c:4887 __ext4_fill_super fs/ext4/super.c:5452 [inline] ext4_fill_super+0x5b6f/0x73e0 fs/ext4/super.c:5680 get_tree_bdev+0x450/0x6a0 fs/super.c:1371 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5710 vfs_get_tree+0x9a/0x270 fs/super.c:1578 do_new_mount+0x251/0xb40 fs/namespace.c:3081 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1580 [inline] free_pcp_prepare mm/page_alloc.c:1654 [inline] free_unref_page_prepare+0x80c/0x820 mm/page_alloc.c:3621 free_unref_page_list+0x117/0x8d0 mm/page_alloc.c:3772 release_pages+0xc7e/0xce0 mm/swap.c:1053 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:316 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:254 [inline] tlb_flush_mmu mm/mmu_gather.c:261 [inline] tlb_finish_mmu+0x1b2/0x380 mm/mmu_gather.c:361 exit_mmap+0x41d/0xc10 mm/mmap.c:3384 __mmput+0x92/0x340 kernel/fork.c:1319 mmput+0x4b/0x150 kernel/fork.c:1343 exit_mm kernel/exit.c:569 [inline] do_exit+0xa51/0x2850 kernel/exit.c:874 do_group_exit+0x21b/0x2e0 kernel/exit.c:1030 get_signal+0x167c/0x1700 kernel/signal.c:2895 arch_do_signal_or_restart+0xd1/0x11c0 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 Memory state around the buggy address: ffff88810920a180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810920a200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88810920a280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88810920a300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810920a380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop6): ext4_mb_generate_buddy:1126: group 0, block bitmap and bg descriptor inconsistent: 6911 vs 220 free clusters EXT4-fs (loop6): Remounting filesystem read-only