Hello, syzbot found the following issue on: HEAD commit: 453f5db0619e Merge tag 'trace-v6.7-rc7' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=127054ade80000 kernel config: https://syzkaller.appspot.com/x/.config?x=d4130d4bb32c48ef dashboard link: https://syzkaller.appspot.com/bug?extid=9c0d9ba56264f1602420 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/09f8d17b45e5/disk-453f5db0.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/384c334e26ee/vmlinux-453f5db0.xz kernel image: https://storage.googleapis.com/syzbot-assets/c93513aa17de/bzImage-453f5db0.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9c0d9ba56264f1602420@xxxxxxxxxxxxxxxxxxxxxxxxx EXT4-fs error (device loop4): __ext4_ext_dirty:202: inode #2: comm syz-executor.4: mark_inode_dirty error ===================================================== BUG: KMSAN: uninit-value in chksum_update+0xae/0xd0 crypto/crc32c_generic.c:88 chksum_update+0xae/0xd0 crypto/crc32c_generic.c:88 crypto_shash_update+0x75/0xa0 crypto/shash.c:74 ext4_chksum fs/ext4/ext4.h:2474 [inline] ext4_dirblock_csum fs/ext4/namei.c:382 [inline] ext4_dirblock_csum_set fs/ext4/namei.c:430 [inline] ext4_handle_dirty_dirblock+0x6d5/0x8d0 fs/ext4/namei.c:438 add_dirent_to_buf+0x885/0x9f0 fs/ext4/namei.c:2215 ext4_add_entry+0xcc2/0x1b30 fs/ext4/namei.c:2447 ext4_mkdir+0xaae/0x1510 fs/ext4/namei.c:3031 vfs_mkdir+0x49a/0x700 fs/namei.c:4106 do_mkdirat+0x529/0x800 fs/namei.c:4129 __do_sys_mkdir fs/namei.c:4149 [inline] __se_sys_mkdir fs/namei.c:4147 [inline] __x64_sys_mkdir+0xa1/0xe0 fs/namei.c:4147 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit was stored to memory at: ext4_chksum fs/ext4/ext4.h:2472 [inline] ext4_dirblock_csum fs/ext4/namei.c:382 [inline] ext4_dirblock_csum_set fs/ext4/namei.c:430 [inline] ext4_handle_dirty_dirblock+0x7d5/0x8d0 fs/ext4/namei.c:438 add_dirent_to_buf+0x885/0x9f0 fs/ext4/namei.c:2215 ext4_add_entry+0xcc2/0x1b30 fs/ext4/namei.c:2447 ext4_mkdir+0xaae/0x1510 fs/ext4/namei.c:3031 vfs_mkdir+0x49a/0x700 fs/namei.c:4106 do_mkdirat+0x529/0x800 fs/namei.c:4129 __do_sys_mkdir fs/namei.c:4149 [inline] __se_sys_mkdir fs/namei.c:4147 [inline] __x64_sys_mkdir+0xa1/0xe0 fs/namei.c:4147 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit was created at: __alloc_pages+0x9a4/0xe00 mm/page_alloc.c:4591 alloc_pages_mpol+0x62b/0x9d0 mm/mempolicy.c:2133 alloc_pages+0x1be/0x1e0 mm/mempolicy.c:2204 alloc_slab_page mm/slub.c:1870 [inline] allocate_slab mm/slub.c:2017 [inline] new_slab+0x421/0x1570 mm/slub.c:2070 ___slab_alloc+0x13db/0x33d0 mm/slub.c:3223 __slab_alloc mm/slub.c:3322 [inline] __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] slab_alloc mm/slub.c:3486 [inline] __kmem_cache_alloc_lru mm/slub.c:3493 [inline] kmem_cache_alloc_lru+0x552/0x970 mm/slub.c:3509 alloc_inode_sb include/linux/fs.h:2937 [inline] ext4_alloc_inode+0x63/0x850 fs/ext4/super.c:1408 alloc_inode+0x83/0x440 fs/inode.c:261 new_inode_pseudo fs/inode.c:1006 [inline] new_inode+0x38/0x420 fs/inode.c:1032 __ext4_new_inode+0x297/0x79b0 fs/ext4/ialloc.c:958 ext4_symlink+0x57e/0x1440 fs/ext4/namei.c:3398 vfs_symlink+0x1e6/0x3e0 fs/namei.c:4464 do_symlinkat+0x257/0x890 fs/namei.c:4490 __do_sys_symlinkat fs/namei.c:4506 [inline] __se_sys_symlinkat fs/namei.c:4503 [inline] __x64_sys_symlinkat+0xf8/0x160 fs/namei.c:4503 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b CPU: 0 PID: 5681 Comm: syz-executor.4 Not tainted 6.7.0-rc7-syzkaller-00049-g453f5db0619e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
