EXT4-fs (loop8): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop8): ext4_mb_generate_buddy:824: group 0, block bitmap and bg descriptor inconsistent: 0 vs 150994969 free clusters ================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1326/0x3860 fs/ext4/xattr.c:1729 Read of size 18446744073709551600 at addr ffff88814562deb8 by task syz.8.1389/4950 CPU: 1 PID: 4950 Comm: syz.8.1389 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 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+0x1326/0x3860 fs/ext4/xattr.c:1729 ext4_xattr_ibody_set+0x122/0x360 fs/ext4/xattr.c:2229 ext4_destroy_inline_data_nolock+0x20f/0x5e0 fs/ext4/inline.c:464 ext4_destroy_inline_data+0x84/0xe0 fs/ext4/inline.c:1896 ext4_writepages+0x766/0x2eb0 fs/ext4/inode.c:2781 do_writepages+0x128/0x280 mm/page-writeback.c:2380 __filemap_fdatawrite_range+0x2a0/0x350 mm/filemap.c:427 file_write_and_wait_range+0x8c/0x110 mm/filemap.c:766 ext4_sync_file+0x1a9/0x9f0 fs/ext4/fsync.c:151 vfs_fsync_range+0x190/0x1a0 fs/sync.c:202 generic_write_sync include/linux/fs.h:2920 [inline] ext4_buffered_write_iter+0x59b/0x640 fs/ext4/file.c:278 ext4_file_write_iter+0x53f/0x1980 fs/ext4/file.c:-1 do_iter_readv_writev+0x478/0x5f0 fs/read_write.c:-1 do_iter_write+0x189/0x630 fs/read_write.c:866 vfs_writev+0x2a9/0x530 fs/read_write.c:939 do_pwritev fs/read_write.c:1036 [inline] __do_sys_pwritev2 fs/read_write.c:1095 [inline] __se_sys_pwritev2+0x1af/0x2b0 fs/read_write.c:1086 __x64_sys_pwritev2+0xbf/0xd0 fs/read_write.c:1086 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fb6446b3e59 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:00007fb64310e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007fb64492cfa0 RCX: 00007fb6446b3e59 RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000007 RBP: 00007fb644749d6f R08: 0000000000000000 R09: 0000000000000003 R10: 0000000000002000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb64492d038 R14: 00007fb64492cfa0 R15: 00007fff1e7047e8 The buggy address belongs to the page: page:ffffea0005158b40 refcount:3 mapcount:1 mapping:ffff888110314290 index:0x2 pfn:0x14562d aops:def_blk_aops ino:0 flags: 0x400000000002203e(referenced|uptodate|dirty|lru|active|private|mappedtodisk) raw: 400000000002203e ffffea0005201a48 ffff888104fe6030 ffff888110314290 raw: 0000000000000002 ffff8881359147e0 0000000300000000 ffff888126cae000 page dumped because: kasan: bad access detected page->mem_cgroup:ffff888126cae000 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 4950, ts 173656166275, free_ts 173620852404 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x223b/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x290/0x620 mm/page_alloc.c:5384 __alloc_pages include/linux/gfp.h:544 [inline] __alloc_pages_node include/linux/gfp.h:557 [inline] alloc_pages_node include/linux/gfp.h:571 [inline] alloc_pages include/linux/gfp.h:590 [inline] __page_cache_alloc include/linux/pagemap.h:290 [inline] pagecache_get_page+0x63e/0x930 mm/filemap.c:1848 find_or_create_page include/linux/pagemap.h:402 [inline] grow_dev_page fs/buffer.c:976 [inline] grow_buffers fs/buffer.c:1045 [inline] __getblk_slow fs/buffer.c:1072 [inline] __getblk_gfp+0x212/0x780 fs/buffer.c:1370 sb_getblk include/linux/buffer_head.h:361 [inline] __ext4_get_inode_loc+0x467/0xc30 fs/ext4/inode.c:4456 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4566 [inline] __ext4_iget+0x495/0x44c0 fs/ext4/inode.c:4816 ext4_fill_super+0x6f30/0x8d70 fs/ext4/super.c:4959 mount_bdev+0x28b/0x3a0 fs/super.c:1442 ext4_mount+0x34/0x40 fs/ext4/super.c:6666 legacy_get_tree+0xed/0x190 fs/fs_context.c:593 vfs_get_tree+0x89/0x260 fs/super.c:1572 do_new_mount+0x25a/0xa20 fs/namespace.c:3006 path_mount+0x585/0xc90 fs/namespace.c:3336 do_mount fs/namespace.c:3349 [inline] __do_sys_mount fs/namespace.c:3557 [inline] __se_sys_mount+0x320/0x390 fs/namespace.c:3534 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3534 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] free_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336 free_unref_page_list+0x129/0x9c0 mm/page_alloc.c:3443 release_pages+0xe52/0xea0 mm/swap.c:1103 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:356 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:326 unmap_region+0x355/0x3c0 mm/mmap.c:2811 __do_munmap+0x63c/0x850 mm/mmap.c:3041 __vm_munmap mm/mmap.c:3094 [inline] __do_sys_munmap mm/mmap.c:3120 [inline] __se_sys_munmap+0x130/0x1c0 mm/mmap.c:3116 __x64_sys_munmap+0x5b/0x70 mm/mmap.c:3116 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff88814562dd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88814562de00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88814562de80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88814562df00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88814562df80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs (loop8): Delayed block allocation failed for inode 15 at logical offset 4 with max blocks 242 with error 28 EXT4-fs (loop8): This should not happen!! Data will be lost EXT4-fs (loop8): Total free blocks count 0 EXT4-fs (loop8): Free/Dirty block details EXT4-fs (loop8): free_blocks=2415919504 EXT4-fs (loop8): dirty_blocks=256 EXT4-fs (loop8): Block reservation details EXT4-fs (loop8): i_reserved_data_blocks=16