================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xaf2/0x21d0 fs/ext4/xattr.c:1708 Read of size 18446744073709551600 at addr ffff88811d4f4eb8 by task syz.9.458/2295 CPU: 1 PID: 2295 Comm: syz.9.458 Tainted: G W 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+0xaf2/0x21d0 fs/ext4/xattr.c:1708 ext4_xattr_ibody_set+0x24e/0x6c0 fs/ext4/xattr.c:2215 ext4_destroy_inline_data_nolock+0x234/0x5d0 fs/ext4/inline.c:468 ext4_convert_inline_data_nolock+0x3c0/0x9e0 fs/ext4/inline.c:1250 ext4_convert_inline_data+0x4b9/0x5f0 fs/ext4/inline.c:2119 ext4_fallocate+0xfd/0x1dc0 fs/ext4/extents.c:4761 vfs_fallocate+0x4c5/0x5a0 fs/open.c:324 ksys_fallocate fs/open.c:347 [inline] __do_sys_fallocate fs/open.c:355 [inline] __se_sys_fallocate fs/open.c:353 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:353 x64_sys_call+0x7fa/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:286 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: 0033:0x7fe7e179ce59 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:00007fe7e2743028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fe7e1a15fa0 RCX: 00007fe7e179ce59 RDX: 0000000000000a20 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 00007fe7e1832d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008000c64 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe7e1a16038 R14: 00007fe7e1a15fa0 R15: 00007fff8574ce38 The buggy address belongs to the physical page: page:ffffea0004753d00 refcount:3 mapcount:1 mapping:ffff888100489c50 index:0x8 pfn:0x11d4f4 memcg:ffff88810023b0c0 aops:def_blk_aops ino:700009 flags: 0x5600000000022056(referenced|uptodate|lru|workingset|private|mappedtodisk|zone=1) raw: 5600000000022056 ffffea00047b4908 ffffea0004753d48 ffff888100489c50 raw: 0000000000000008 ffff88813f44e738 0000000300000000 ffff88810023b0c0 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x152c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 311, tgid 311 (udevd), ts 107362393266, free_ts 106386663016 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+0x2d12/0x2d80 mm/page_alloc.c:4585 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5929 __folio_alloc+0x12/0x40 mm/page_alloc.c:5962 __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] page_cache_ra_unbounded+0x256/0x850 mm/readahead.c:260 do_page_cache_ra mm/readahead.c:313 [inline] force_page_cache_ra mm/readahead.c:344 [inline] page_cache_sync_ra+0x3e3/0x490 mm/readahead.c:735 page_cache_sync_readahead include/linux/pagemap.h:1259 [inline] filemap_get_pages mm/filemap.c:2693 [inline] filemap_read+0x69c/0x2480 mm/filemap.c:2788 blkdev_read_iter+0x426/0x560 block/fops.c:668 call_read_iter include/linux/fs.h:2276 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x454/0x910 fs/read_write.c:470 ksys_read+0x149/0x250 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:621 x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:1 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 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+0x7f8/0x800 mm/page_alloc.c:3620 free_unref_page_list+0x117/0x8c0 mm/page_alloc.c:3771 release_pages+0xc93/0xcf0 mm/swap.c:1053 __pagevec_release+0x71/0xe0 mm/swap.c:1073 pagevec_release include/linux/pagevec.h:71 [inline] folio_batch_release include/linux/pagevec.h:135 [inline] truncate_inode_pages_range+0x365/0xd70 mm/truncate.c:402 truncate_inode_pages+0x24/0x30 mm/truncate.c:484 kill_bdev block/bdev.c:77 [inline] blkdev_flush_mapping+0x158/0x2c0 block/bdev.c:686 blkdev_put_whole block/bdev.c:717 [inline] blkdev_put+0x478/0x710 block/bdev.c:977 kill_block_super+0xb8/0xf0 fs/super.c:1478 kill_f2fs_super+0x309/0x3c0 fs/f2fs/super.c:4893 deactivate_locked_super+0xb5/0x120 fs/super.c:336 deactivate_super+0xaf/0xe0 fs/super.c:367 cleanup_mnt+0x474/0x500 fs/namespace.c:1192 __cleanup_mnt+0x19/0x20 fs/namespace.c:1199 task_work_run+0x1e1/0x250 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177 Memory state around the buggy address: ffff88811d4f4d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811d4f4e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811d4f4e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88811d4f4f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811d4f4f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop9): ext4_read_block_bitmap_nowait:477: comm syz.9.458: Invalid block bitmap block 0 in block_group 0