Hello, syzbot found the following issue on: HEAD commit: 16a8829130ca nfs: fix another case of NULL/IS_ERR confusio.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17c0674c280000 kernel config: https://syzkaller.appspot.com/x/.config?x=a7a1059074b7bdce dashboard link: https://syzkaller.appspot.com/bug?extid=a66467b3864e82f8559f compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d4c6da24829a/disk-16a88291.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7b2a0fc666c9/vmlinux-16a88291.xz kernel image: https://storage.googleapis.com/syzbot-assets/710105c78106/bzImage-16a88291.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a66467b3864e82f8559f@xxxxxxxxxxxxxxxxxxxxxxxxx floppy0: no floppy controllers found work still pending ===================================================== BUG: KMSAN: uninit-value in strcmp+0xcf/0x120 lib/string.c:283 strcmp+0xcf/0x120 lib/string.c:283 unregister_blkdev+0x142/0x270 block/genhd.c:293 do_floppy_init+0x4d3/0x15f0 drivers/block/floppy.c:4751 floppy_async_init+0x17/0x20 drivers/block/floppy.c:4767 async_run_entry_fn+0x97/0x420 kernel/async.c:127 process_one_work+0xb0d/0x1410 kernel/workqueue.c:2405 worker_thread+0x107e/0x1d60 kernel/workqueue.c:2552 kthread+0x3e8/0x540 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Uninit was created at: slab_post_alloc_hook+0x12d/0xb60 mm/slab.h:716 slab_alloc_node mm/slub.c:3451 [inline] __kmem_cache_alloc_node+0x4ff/0x8b0 mm/slub.c:3490 kmalloc_trace+0x51/0x200 mm/slab_common.c:1057 kmalloc include/linux/slab.h:559 [inline] __register_blkdev+0x1a9/0x650 block/genhd.c:246 do_floppy_init+0x420/0x15f0 drivers/block/floppy.c:4604 floppy_async_init+0x17/0x20 drivers/block/floppy.c:4767 async_run_entry_fn+0x97/0x420 kernel/async.c:127 process_one_work+0xb0d/0x1410 kernel/workqueue.c:2405 worker_thread+0x107e/0x1d60 kernel/workqueue.c:2552 kthread+0x3e8/0x540 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 CPU: 1 PID: 39 Comm: kworker/u4:3 Not tainted 6.4.0-rc1-syzkaller-00012-g16a8829130ca #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Workqueue: events_unbound async_run_entry_fn ===================================================== --- 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 bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
