================================================================== BUG: KASAN: slab-out-of-bounds in dx_insert_block fs/ext4/namei.c:1387 [inline] BUG: KASAN: slab-out-of-bounds in do_split+0x1a73/0x1f70 fs/ext4/namei.c:2080 Read of size 157024 at addr ffff88812816e028 by task syz.0.428/1582 CPU: 0 PID: 1582 Comm: syz.0.428 Not tainted 5.15.180-syzkaller-00024-g88c4075c39ed #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 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+0x280/0x290 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 dx_insert_block fs/ext4/namei.c:1387 [inline] do_split+0x1a73/0x1f70 fs/ext4/namei.c:2080 make_indexed_dir+0xe01/0x14a0 fs/ext4/namei.c:2392 ext4_add_entry+0xc24/0xf40 fs/ext4/namei.c:2504 __ext4_link+0x4d7/0x770 fs/ext4/namei.c:3536 ext4_link+0x1de/0x270 fs/ext4/namei.c:3577 vfs_link+0x636/0x7f0 fs/namei.c:4557 do_linkat+0x1e7/0x730 fs/namei.c:4628 __do_sys_link fs/namei.c:4662 [inline] __se_sys_link fs/namei.c:4660 [inline] __x64_sys_link+0x86/0x90 fs/namei.c:4660 x64_sys_call+0x34d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:87 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 RIP: 0033:0x7f6ea6224969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6ea5c95038 EFLAGS: 00000246 ORIG_RAX: 0000000000000056 RAX: ffffffffffffffda RBX: 00007f6ea644bfa0 RCX: 00007f6ea6224969 RDX: 0000000000000000 RSI: 0000200000000bc0 RDI: 0000200000001240 RBP: 00007f6ea62a6ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6ea644bfa0 R15: 00007ffca01c18c8 The buggy address belongs to the page: page:ffffea0004a05b80 refcount:3 mapcount:1 mapping:ffff8881092d7a18 index:0x1 pfn:0x12816e memcg:ffff88810024c000 aops:def_blk_aops ino:700000 flags: 0x400000000032201e(referenced|uptodate|dirty|lru|private|mappedtodisk|unevictable|mlocked|zone=1) raw: 400000000032201e ffff888100240040 ffffea0004af9388 ffff8881092d7a18 raw: 0000000000000001 ffff888120ff9738 0000000300000000 ffff88810024c000 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 1457, ts 176998997621, free_ts 169730171812 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+0x2cc5/0x2d50 mm/page_alloc.c:4485 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5781 __alloc_pages_node include/linux/gfp.h:591 [inline] alloc_pages_node include/linux/gfp.h:605 [inline] alloc_pages include/linux/gfp.h:618 [inline] __page_cache_alloc include/linux/pagemap.h:305 [inline] page_cache_ra_unbounded+0x2b2/0x980 mm/readahead.c:227 do_page_cache_ra mm/readahead.c:280 [inline] force_page_cache_ra+0x3fd/0x460 mm/readahead.c:312 page_cache_sync_ra+0x2ae/0x420 mm/readahead.c:590 page_cache_sync_readahead include/linux/pagemap.h:831 [inline] filemap_get_pages mm/filemap.c:2560 [inline] filemap_read+0x63a/0x1f70 mm/filemap.c:2645 generic_file_read_iter+0xac/0x400 mm/filemap.c:2805 blkdev_read_iter+0x12f/0x160 block/fops.c:560 call_read_iter include/linux/fs.h:2198 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0x68b/0xbe0 fs/read_write.c:485 ksys_read+0x140/0x240 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:631 x64_sys_call+0x96d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:1 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+0xa2/0x550 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5857 pcpu_free_pages mm/percpu-vm.c:65 [inline] pcpu_depopulate_chunk+0x481/0x5a0 mm/percpu-vm.c:330 pcpu_reclaim_populated mm/percpu.c:2195 [inline] pcpu_balance_workfn+0x2a7/0x1150 mm/percpu.c:2247 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472 kthread+0x411/0x500 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff88812816ef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88812816f000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88812816f080: 00 fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 ^ ffff88812816f100: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ffff88812816f180: fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop0): ext4_dx_csum_set:531: inode #2: comm syz.0.428: dir seems corrupt? Run e2fsck -D.