================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x11db/0x3a80 fs/ext4/xattr.c:1736 Read of size 18446744073709551600 at addr ffff8881221306b8 by task kworker/u4:3/307 CPU: 1 PID: 307 Comm: kworker/u4:3 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: writeback wb_workfn (flush-7:3) 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:1736 ext4_xattr_ibody_set+0x114/0x330 fs/ext4/xattr.c:2238 ext4_destroy_inline_data_nolock+0x234/0x5e0 fs/ext4/inline.c:468 ext4_destroy_inline_data+0x84/0xe0 fs/ext4/inline.c:1915 ext4_writepages+0x64c/0x30a0 fs/ext4/inode.c:2750 do_writepages+0x476/0x6d0 mm/page-writeback.c:2388 __writeback_single_inode+0xd9/0x9e0 fs/fs-writeback.c:1657 writeback_sb_inodes+0x9f3/0x1610 fs/fs-writeback.c:1940 wb_writeback+0x3eb/0x990 fs/fs-writeback.c:2116 wb_do_writeback fs/fs-writeback.c:2263 [inline] wb_workfn+0x3ac/0xf30 fs/fs-writeback.c:2304 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328 worker_thread+0xaa0/0x1250 kernel/workqueue.c:2475 kthread+0x3f5/0x4f0 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the page: page:ffffea0004884c00 refcount:2 mapcount:0 mapping:ffff888109302c98 index:0x11 pfn:0x122130 memcg:ffff888100252280 aops:def_blk_aops ino:700003 flags: 0x4000000000022036(referenced|uptodate|lru|active|private|mappedtodisk|zone=1) raw: 4000000000022036 ffffea0004884c48 ffffea0004884bc8 ffff888109302c98 raw: 0000000000000011 ffff8881331c13f0 00000002ffffffff ffff888100252280 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 756, ts 36718303053, free_ts 36703147472 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+0x2c3a/0x2cd0 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+0x2bc/0x960 mm/readahead.c:227 do_page_cache_ra mm/readahead.c:280 [inline] ondemand_readahead+0x8b7/0xeb0 mm/readahead.c:565 page_cache_async_ra+0x2a9/0x2e0 mm/readahead.c:624 page_cache_async_readahead include/linux/pagemap.h:854 [inline] do_async_mmap_readahead mm/filemap.c:3045 [inline] filemap_fault+0x9d2/0x1770 mm/filemap.c:3150 __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] do_user_addr_fault+0x808/0x11c0 arch/x86/mm/fault.c:1416 handle_page_fault arch/x86/mm/fault.c:1507 [inline] exc_page_fault+0x51/0xb0 arch/x86/mm/fault.c:1560 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:606 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+0x138/0x9e0 mm/page_alloc.c:3671 shrink_page_list+0x5683/0x5800 mm/vmscan.c:1912 reclaim_pages+0x54c/0x800 mm/vmscan.c:2556 madvise_cold_or_pageout_pte_range+0x1819/0x1b50 mm/madvise.c:506 walk_pmd_range mm/pagewalk.c:128 [inline] walk_pud_range mm/pagewalk.c:205 [inline] walk_p4d_range mm/pagewalk.c:240 [inline] walk_pgd_range+0xb3b/0x13b0 mm/pagewalk.c:277 __walk_page_range mm/pagewalk.c:379 [inline] walk_page_range+0x3e1/0x540 mm/pagewalk.c:477 madvise_pageout_page_range mm/madvise.c:561 [inline] madvise_pageout mm/madvise.c:602 [inline] madvise_vma_behavior mm/madvise.c:994 [inline] madvise_walk_vmas mm/madvise.c:1218 [inline] do_madvise+0x1e6e/0x2420 mm/madvise.c:1396 __do_sys_madvise mm/madvise.c:1409 [inline] __se_sys_madvise mm/madvise.c:1407 [inline] __x64_sys_madvise+0xa9/0xc0 mm/madvise.c:1407 x64_sys_call+0x89b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:29 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: ffff888122130580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888122130600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888122130680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888122130700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888122130780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop3): ext4_read_block_bitmap_nowait:476: comm kworker/u4:3: Invalid block bitmap block 0 in block_group 0 EXT4-fs (loop3): Remounting filesystem read-only