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Date:      Thu, 04 Sep 2025 22:18:11 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 289306] loader fails to parse vdisk device names
Message-ID:  <bug-289306-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289306

            Bug ID: 289306
           Summary: loader fails to parse vdisk device names
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: jgopensource@proton.me

The loader has a "map-vdisk" command. It creates virtual disk devices with
names like "vdisk0:", "vdisk1:", "vdisk2:", etc.

After creating a vdisk0: device which is visible in the output of "lsdev", the
command "set currdev=vdisk0:" fails with the error "bad unit number". This is
unexpected and seems to be caused by an assumption in disk_parsedev() that the
text before the unit number will be 4 characters in length:
        np = devspec + 4;       /* Skip the leading 'disk' */

Observed on FreeBSD 15.0-PRERELEASE, snapshot from 28 August 2025.

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