loop0: detected capacity change from 0 to 512 EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: writeback. ================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x11db/0x3a80 fs/ext4/xattr.c:1738 Read of size 18446744073709551600 at addr ffff8881314572b8 by task syz.0.218/1097 CPU: 0 PID: 1097 Comm: syz.0.218 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 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+0x10f/0x150 mm/kasan/report.c:444 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+0x11db/0x3a80 fs/ext4/xattr.c:1738 ext4_xattr_ibody_set+0x114/0x330 fs/ext4/xattr.c:2240 ext4_destroy_inline_data_nolock+0x234/0x5e0 fs/ext4/inline.c:468 ext4_convert_inline_data_to_extent fs/ext4/inline.c:641 [inline] ext4_try_to_write_inline_data+0x6f4/0x11a0 fs/ext4/inline.c:782 ext4_write_begin+0x26a/0x1360 fs/ext4/inode.c:1194 ext4_da_write_begin+0x361/0xbd0 fs/ext4/inode.c:2990 generic_perform_write+0x2b7/0x690 mm/filemap.c:3887 ext4_buffered_write_iter+0x4ab/0x630 fs/ext4/file.c:270 ext4_file_write_iter+0x427/0x1530 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2212 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x831/0xfd0 fs/read_write.c:594 ksys_write+0x14a/0x260 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:656 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 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: 0033:0x7fd0c50ff0d9 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:00007fd0c3b58028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fd0c5386fa0 RCX: 00007fd0c50ff0d9 RDX: 000000000000045c RSI: 0000200000000f80 RDI: 0000000000000005 RBP: 00007fd0c5196024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd0c5387038 R14: 00007fd0c5386fa0 R15: 00007fff00e9eeb8 The buggy address belongs to the page: page:ffffea0004c515c0 refcount:6 mapcount:1 mapping:ffff8881092c5b18 index:0xe pfn:0x131457 memcg:ffff88810df44500 aops:def_blk_aops ino:700000 flags: 0x4000000000022016(referenced|uptodate|lru|private|mappedtodisk|zone=1) raw: 4000000000022016 ffffea0004cdc3c8 ffffea0004a31948 ffff8881092c5b18 raw: 000000000000000e ffff888129b2a3f0 0000000600000000 ffff88810df44500 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 1097, ts 89603726884, free_ts 80322283825 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824 __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] page_cache_ra_unbounded+0x2bc/0x960 mm/readahead.c:227 do_page_cache_ra+0xf2/0x110 mm/readahead.c:280 do_sync_mmap_readahead+0x6ea/0xaf0 mm/filemap.c:3027 filemap_fault+0x7a2/0x1cc0 mm/filemap.c:3175 __do_fault+0x25f/0x2f0 mm/memory.c:4195 do_read_fault mm/memory.c:4568 [inline] do_fault mm/memory.c:4709 [inline] handle_pte_fault+0x1bc0/0x2770 mm/memory.c:4923 __handle_mm_fault mm/memory.c:-1 [inline] do_handle_mm_fault+0x1b3b/0x1e30 mm/memory.c:5345 handle_mm_fault include/linux/mm.h:1847 [inline] faultin_page mm/gup.c:976 [inline] __get_user_pages+0x80e/0x10c0 mm/gup.c:1197 populate_vma_page_range mm/gup.c:1529 [inline] __mm_populate+0x324/0x470 mm/gup.c:1638 mm_populate include/linux/mm.h:2704 [inline] vm_mmap_pgoff+0x245/0x410 mm/util.c:560 ksys_mmap_pgoff+0x161/0x1d0 mm/mmap.c:1647 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:93 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:86 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1474 [inline] free_pcp_prepare mm/page_alloc.c:1546 [inline] free_unref_page_prepare+0x5fa/0x600 mm/page_alloc.c:3536 free_unref_page+0xae/0x540 mm/page_alloc.c:3618 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5900 free_pages+0x82/0x90 mm/page_alloc.c:5911 kasan_depopulate_vmalloc_pte+0x6b/0x90 mm/kasan/shadow.c:354 apply_to_pte_range mm/memory.c:2645 [inline] apply_to_pmd_range mm/memory.c:2689 [inline] apply_to_pud_range mm/memory.c:2725 [inline] apply_to_p4d_range mm/memory.c:2761 [inline] __apply_to_page_range+0x8ca/0xc70 mm/memory.c:2797 apply_to_existing_page_range+0x38/0x50 mm/memory.c:2830 kasan_release_vmalloc+0x97/0xb0 mm/kasan/shadow.c:464 __purge_vmap_area_lazy+0xa8d/0x1890 mm/vmalloc.c:1723 _vm_unmap_aliases+0x2f1/0x370 mm/vmalloc.c:2126 vm_remove_mappings mm/vmalloc.c:2619 [inline] __vunmap+0x642/0x980 mm/vmalloc.c:2650 __vfree mm/vmalloc.c:2709 [inline] vfree+0x8b/0xc0 mm/vmalloc.c:2740 module_memfree+0x17/0x30 kernel/module.c:2150 bpf_jit_free_exec+0x15/0x20 kernel/bpf/core.c:871 bpf_jit_binary_free kernel/bpf/core.c:918 [inline] bpf_jit_free+0x98/0x240 kernel/bpf/core.c:931 bpf_prog_free_deferred+0x5c7/0x6d0 kernel/bpf/core.c:2315 Memory state around the buggy address: ffff888131457180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888131457200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888131457280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888131457300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888131457380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop0): ext4_read_block_bitmap_nowait:510: comm syz.0.218: Block bitmap for bg 0 marked uninitialized