EXT4-fs (loop6): Remounting filesystem read-only ================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xb02/0x2230 fs/ext4/xattr.c:1708 Read of size 18446744073709551600 at addr ffff88811dd28eb8 by task syz.6.3307/11976 CPU: 0 PID: 11976 Comm: syz.6.3307 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+0xb02/0x2230 fs/ext4/xattr.c:1708 ext4_xattr_ibody_set+0x25b/0x720 fs/ext4/xattr.c:2215 ext4_destroy_inline_data_nolock+0x234/0x5e0 fs/ext4/inline.c:468 ext4_convert_inline_data_to_extent fs/ext4/inline.c:620 [inline] ext4_try_to_write_inline_data+0x764/0x1330 fs/ext4/inline.c:761 ext4_write_begin+0x1f8/0xfc0 fs/ext4/inode.c:1207 generic_perform_write+0x32d/0x740 mm/filemap.c:3915 ext4_buffered_write_iter+0x38f/0x690 fs/ext4/file.c:285 ext4_file_write_iter+0x4b2/0x1540 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2282 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ef/0xd00 fs/read_write.c:584 ksys_pwrite64 fs/read_write.c:699 [inline] __do_sys_pwrite64 fs/read_write.c:709 [inline] __se_sys_pwrite64 fs/read_write.c:706 [inline] __x64_sys_pwrite64+0x194/0x220 fs/read_write.c:706 x64_sys_call+0x36/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:19 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: 0033:0x7f829019de99 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:00007f82910a0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007f8290425fa0 RCX: 00007f829019de99 RDX: 00000000ffffff07 RSI: 0000200000000140 RDI: 0000000000000009 RBP: 00007f8290233eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008000c61 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8290426038 R14: 00007f8290425fa0 R15: 00007fff199bc098 The buggy address belongs to the physical page: page:ffffea0004774a00 refcount:3 mapcount:1 mapping:ffff88810048ba50 index:0x4 pfn:0x11dd28 memcg:ffff8881002389c0 aops:def_blk_aops ino:700006 flags: 0x560000000002205e(referenced|uptodate|dirty|lru|workingset|private|mappedtodisk|zone=1) raw: 560000000002205e ffffea0004c90f08 ffffea0004c9d448 ffff88810048ba50 raw: 0000000000000004 ffff888117bb2150 0000000300000000 ffff8881002389c0 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 2470, tgid 2470 (udevd), ts 566350868055, free_ts 566339615294 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+0x2ca9/0x2d20 mm/page_alloc.c:4586 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930 __folio_alloc+0x12/0x40 mm/page_alloc.c:5963 __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+0x24d/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+0x3ec/0x4a0 mm/readahead.c:735 page_cache_sync_readahead include/linux/pagemap.h:1259 [inline] filemap_get_pages mm/filemap.c:2694 [inline] filemap_read+0x6b6/0x23c0 mm/filemap.c:2789 blkdev_read_iter+0x439/0x580 block/fops.c:668 call_read_iter include/linux/fs.h:2276 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x46e/0x930 fs/read_write.c:470 ksys_read+0x14a/0x260 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+0x80c/0x820 mm/page_alloc.c:3621 free_unref_page_list+0x117/0x8d0 mm/page_alloc.c:3772 release_pages+0xc7e/0xce0 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+0x362/0xd20 mm/truncate.c:402 truncate_inode_pages+0x24/0x30 mm/truncate.c:484 kill_bdev block/bdev.c:77 [inline] set_blocksize+0x2ef/0x470 block/bdev.c:169 sb_set_blocksize block/bdev.c:183 [inline] sb_min_blocksize+0xcb/0x190 block/bdev.c:199 ext4_load_super fs/ext4/super.c:4975 [inline] __ext4_fill_super fs/ext4/super.c:5138 [inline] ext4_fill_super+0x6b9/0x73e0 fs/ext4/super.c:5680 get_tree_bdev+0x450/0x6a0 fs/super.c:1371 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5710 vfs_get_tree+0x9a/0x270 fs/super.c:1578 do_new_mount+0x251/0xb40 fs/namespace.c:3081 path_mount+0x640/0xfd0 fs/namespace.c:3411 do_mount fs/namespace.c:3424 [inline] __do_sys_mount fs/namespace.c:3632 [inline] __se_sys_mount+0x320/0x390 fs/namespace.c:3609 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3609 Memory state around the buggy address: ffff88811dd28d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811dd28e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811dd28e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88811dd28f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811dd28f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop6): ext4_read_block_bitmap_nowait:477: comm syz.6.3307: Invalid block bitmap block 0 in block_group 0 EXT4-fs (loop6): Remounting filesystem read-only