================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x13ba/0x3940 fs/ext4/xattr.c:1736 Read of size 18446744073709551600 at addr ffff88813b5d62b8 by task syz.6.619/2528 CPU: 1 PID: 2528 Comm: syz.6.619 Not tainted 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:2748 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:3164 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: 0033:0x7f1adbfb4dd9 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:00007fffd0e3a668 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007fffd0e3a750 RCX: 00007f1adbfb4dd9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00000000000191bb R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b2c720000 R11: 0000000000000246 R12: 00007fffd0e3a790 R13: 00007f1adc22dfac R14: 00000000000192b6 R15: 00007f1adc22dfa0 The buggy address belongs to the page: page:ffffea0004ed7580 refcount:3 mapcount:1 mapping:ffff88810933f258 index:0x2 pfn:0x13b5d6 memcg:ffff8881144b8000 aops:def_blk_aops ino:700006 flags: 0x400000000002203e(referenced|uptodate|dirty|lru|active|private|mappedtodisk|zone=1) raw: 400000000002203e ffffea000507b688 ffff88810025f730 ffff88810933f258 raw: 0000000000000002 ffff888131d55150 0000000300000000 ffff8881144b8000 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 2529, ts 102983891601, free_ts 102982445782 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] pagecache_get_page+0xac6/0xde0 mm/filemap.c:1955 find_or_create_page include/linux/pagemap.h:418 [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+0x238/0x7d0 fs/buffer.c:1336 sb_getblk include/linux/buffer_head.h:361 [inline] __ext4_get_inode_loc+0x46e/0xcd0 fs/ext4/inode.c:4363 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4471 [inline] __ext4_iget+0x448/0x3e50 fs/ext4/inode.c:4726 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+0xfc9/0x2f20 fs/namei.c:3747 do_filp_open+0x1e2/0x410 fs/namei.c:3777 do_sys_openat2+0x15e/0x7f0 fs/open.c:1236 do_sys_open fs/open.c:1252 [inline] __do_sys_open fs/open.c:1260 [inline] __se_sys_open fs/open.c:1256 [inline] __x64_sys_open+0x11c/0x140 fs/open.c:1256 x64_sys_call+0x3fc/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:3 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: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_list+0x13a/0x9d0 mm/page_alloc.c:3671 release_pages+0x1006/0x1060 mm/swap.c:1015 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:320 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:240 [inline] tlb_flush_mmu mm/mmu_gather.c:247 [inline] tlb_finish_mmu+0x17e/0x310 mm/mmu_gather.c:338 exit_mmap+0x43b/0x8b0 mm/mmap.c:3248 __mmput+0x93/0x320 kernel/fork.c:1180 mmput+0x50/0x150 kernel/fork.c:1203 exit_mm kernel/exit.c:554 [inline] do_exit+0x9f2/0x27e0 kernel/exit.c:876 do_group_exit+0x141/0x310 kernel/exit.c:1003 __do_sys_exit_group kernel/exit.c:1014 [inline] __se_sys_exit_group kernel/exit.c:1012 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1012 x64_sys_call+0x832/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232 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: ffff88813b5d6180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88813b5d6200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88813b5d6280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88813b5d6300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88813b5d6380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs (loop6): Delayed block allocation failed for inode 15 at logical offset 0 with max blocks 2 with error 28 EXT4-fs (loop6): This should not happen!! Data will be lost EXT4-fs (loop6): Total free blocks count 0 EXT4-fs (loop6): Free/Dirty block details EXT4-fs (loop6): free_blocks=68451041280 EXT4-fs (loop6): dirty_blocks=16 EXT4-fs (loop6): Block reservation details EXT4-fs (loop6): i_reserved_data_blocks=1