[Bug 275147] ext2fs mounted at the root of the system does not unmount

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275147

            Bug ID: 275147
           Summary: ext2fs mounted at the root of the system does not
                    unmount
           Product: Base System
           Version: 13.2-STABLE
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: WinslowDoug@gmail.com

Please excuse my brevity. I hope this is helpful.

I'm attempting to use a FreeBSD system I installed onto a root device formatted
in Linux using its ext2 file system standard, however this bug is also showing
after zeroing the device and using ext3 and ext4. Disk does not automatically
remount at boot due to the file system being flagged for checking. This happens
with or without a partition table leading the disk.

System bootstrap is via CD-ROM with load of kernel and ext2fs.ko and 'boot -a'.
VM session is via QEMU 5.2.0. Workaround is 'mount -f /' in single-user mode or
file system check while disk is off-line.

The following information is transcribed via hand from the on-screen log:

Waiting (max 60 seconds) for system process `vnlru' to stop... done
Waiting (max 60 seconds) for system process `syncer' to stop...
Syncing disks, vnodes remaining... 0 0 0 0 0 0 0 0 0 done
All buffers synced.
unmount of / failed (22)

WARNING: Filesystem was not properly dismounted
Starting file system checks:
WARNING: R/W mount of / denied.  Filesystem is not clean - run fsck
mount: /dev/ada0: Operation not permitted
Mounting root filesystem rw failed, startup aborted
ERROR: ABORTING BOOT (sending SIGTERM to parent)!
2023-11-16T21:27:56.51196-05:00 - init 1 - - /bin/sh on /etc/rc terminated
abnormally, going to single user mode
Enter full pathname of shell or RETURN for /bin/sh:

-- 
You are receiving this mail because:
You are the assignee for the bug.