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=10811e34280000 kernel config: https://syzkaller.appspot.com/x/.config?x=a7a1059074b7bdce dashboard link: https://syzkaller.appspot.com/bug?extid=26836cb949db3d40c992 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+26836cb949db3d40c992@xxxxxxxxxxxxxxxxxxxxxxxxx sd 0:0:1:0: [sda] 4194304 512-byte logical blocks: (2.15 GB/2.00 GiB) sd 0:0:1:0: [sda] 4096-byte physical blocks sd 0:0:1:0: [sda] Write Protect is off sd 0:0:1:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA ===================================================== BUG: KMSAN: uninit-value in strlen lib/string.c:418 [inline] BUG: KMSAN: uninit-value in strlcat+0x67/0x160 lib/string.c:252 strlen lib/string.c:418 [inline] strlcat+0x67/0x160 lib/string.c:252 msdos_partition+0x366d/0x46a0 block/partitions/msdos.c:696 check_partition block/partitions/core.c:138 [inline] blk_add_partitions block/partitions/core.c:594 [inline] bdev_disk_changed+0xab5/0x2070 block/partitions/core.c:680 blkdev_get_whole+0x633/0x6c0 block/bdev.c:619 blkdev_get_by_dev+0x50f/0x1200 block/bdev.c:756 disk_scan_partitions+0x2d8/0x3d0 block/genhd.c:379 device_add_disk+0x16d9/0x17b0 block/genhd.c:519 sd_probe+0x132e/0x1710 drivers/scsi/sd.c:3587 really_probe+0x506/0xf40 drivers/base/dd.c:658 __driver_probe_device+0x2a7/0x5d0 drivers/base/dd.c:800 driver_probe_device+0x72/0x7b0 drivers/base/dd.c:830 __device_attach_driver+0x55a/0x8f0 drivers/base/dd.c:958 bus_for_each_drv+0x3ff/0x620 drivers/base/bus.c:457 __device_attach_async_helper+0x208/0x2b0 drivers/base/dd.c:987 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: __alloc_pages+0x9a4/0xe00 mm/page_alloc.c:4791 alloc_pages+0xd01/0x1040 __get_free_pages+0x34/0xc0 mm/page_alloc.c:4818 check_partition block/partitions/core.c:122 [inline] blk_add_partitions block/partitions/core.c:594 [inline] bdev_disk_changed+0x63c/0x2070 block/partitions/core.c:680 blkdev_get_whole+0x633/0x6c0 block/bdev.c:619 blkdev_get_by_dev+0x50f/0x1200 block/bdev.c:756 disk_scan_partitions+0x2d8/0x3d0 block/genhd.c:379 device_add_disk+0x16d9/0x17b0 block/genhd.c:519 sd_probe+0x132e/0x1710 drivers/scsi/sd.c:3587 really_probe+0x506/0xf40 drivers/base/dd.c:658 __driver_probe_device+0x2a7/0x5d0 drivers/base/dd.c:800 driver_probe_device+0x72/0x7b0 drivers/base/dd.c:830 __device_attach_driver+0x55a/0x8f0 drivers/base/dd.c:958 bus_for_each_drv+0x3ff/0x620 drivers/base/bus.c:457 __device_attach_async_helper+0x208/0x2b0 drivers/base/dd.c:987 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: 1018 Comm: kworker/u4:5 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
