================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x13ba/0x3940 fs/ext4/xattr.c:1736 Read of size 18446744073709551600 at addr ffff8881356d7eb8 by task syz.0.939/3824 CPU: 1 PID: 3824 Comm: syz.0.939 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 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+0xf1/0x140 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+0x13ba/0x3940 fs/ext4/xattr.c:1736 ext4_xattr_ibody_set+0x122/0x360 fs/ext4/xattr.c:2238 ext4_destroy_inline_data_nolock+0x234/0x5d0 fs/ext4/inline.c:468 ext4_destroy_inline_data+0x84/0xe0 fs/ext4/inline.c:1915 ext4_writepages+0x64f/0x3090 fs/ext4/inode.c:2750 do_writepages+0x473/0x6c0 mm/page-writeback.c:2388 filemap_fdatawrite_wbc+0x1f4/0x250 mm/filemap.c:409 __filemap_fdatawrite_range mm/filemap.c:442 [inline] __filemap_fdatawrite mm/filemap.c:448 [inline] filemap_flush+0xd4/0x130 mm/filemap.c:475 ext4_alloc_da_blocks+0x7a/0x190 fs/ext4/inode.c:3166 ext4_release_file+0x84/0x320 fs/ext4/file.c:143 __fput+0x20b/0x8b0 fs/file_table.c:311 ____fput+0x15/0x20 fs/file_table.c:339 task_work_run+0x127/0x190 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f865d903e59 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:00007ffd016a1328 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007ffd016a1410 RCX: 00007f865d903e59 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 000000000002f5ac R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b2f920000 R11: 0000000000000246 R12: 00007ffd016a1450 R13: 00007f865db7cfac R14: 000000000002f673 R15: 00007f865db7cfa0 The buggy address belongs to the page: page:ffffea0004d5b5c0 refcount:3 mapcount:1 mapping:ffff88810930bc18 index:0x8 pfn:0x1356d7 memcg:ffff888129bfd640 aops:def_blk_aops ino:700000 flags: 0x400000000002203e(referenced|uptodate|dirty|lru|active|private|mappedtodisk|zone=1) raw: 400000000002203e ffffea0005183908 ffffea00045fe888 ffff88810930bc18 raw: 0000000000000008 ffff888129444b28 0000000300000000 ffff888129bfd640 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 3825, ts 193648509067, free_ts 193645304853 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+0x2d3a/0x2dc0 mm/page_alloc.c:4485 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5822 __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+0x2d5/0x9a0 mm/readahead.c:227 do_page_cache_ra+0xf2/0x110 mm/readahead.c:280 do_sync_mmap_readahead+0x699/0x960 mm/filemap.c:3018 filemap_fault+0xb32/0x1770 mm/filemap.c:3161 __do_fault+0x264/0x2f0 mm/memory.c:4195 do_read_fault mm/memory.c:4568 [inline] do_fault mm/memory.c:4709 [inline] handle_pte_fault+0x1aff/0x27a0 mm/memory.c:4923 __handle_mm_fault mm/memory.c:-1 [inline] do_handle_mm_fault+0x1af9/0x1de0 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+0x262/0x430 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: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+0xae/0x540 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5898 free_pages+0x82/0x90 mm/page_alloc.c:5909 tlb_batch_list_free mm/mmu_gather.c:61 [inline] tlb_finish_mmu+0x258/0x310 mm/mmu_gather.c:341 exit_mmap+0x43b/0x8b0 mm/mmap.c:3248 __mmput+0x93/0x320 kernel/fork.c:1185 mmput+0x50/0x150 kernel/fork.c:1208 exit_mm kernel/exit.c:555 [inline] do_exit+0xa89/0x2890 kernel/exit.c:877 __do_sys_exit kernel/exit.c:973 [inline] __se_sys_exit kernel/exit.c:971 [inline] __ia32_sys_exit+0x0/0x40 kernel/exit.c:971 x64_sys_call+0x44/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:61 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 Memory state around the buggy address: ffff8881356d7d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881356d7e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881356d7e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8881356d7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881356d7f80: 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:476: comm syz.0.939: Invalid block bitmap block 0 in block_group 0 EXT4-fs (loop0): Delayed block allocation failed for inode 15 at logical offset 0 with max blocks 1 with error 117 EXT4-fs (loop0): This should not happen!! Data will be lost