[Bug 59039] New: mountmgr.sys thread-stalls and prevents apps opening if prefix/dosdevices is readonly

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59039

Bug ID: 59039
           Summary: mountmgr.sys thread-stalls and prevents apps opening
                    if prefix/dosdevices is readonly
           Product: Wine
           Version: 10.18
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: mountmgr.sys
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

$ chmod -w ~/.wine/dosdevices
$ wine /path/to/exe
…
0058:err:sync:RtlpWaitForCriticalSection section 00006FFFFE69B040
"/var/tmp/portage/app-emulation/wine-vanilla-10.18/work/wine-10.18/dlls/mountmgr.sys/device.c:
device_section" wait timed out in thread 0058, blocked by 0060, retrying (60
sec)
0058:err:sync:RtlpWaitForCriticalSection section 00006FFFFE69B040
"/var/tmp/portage/app-emulation/wine-vanilla-10.18/work/wine-10.18/dlls/mountmgr.sys/device.c:
device_section" wait timed out in thread 0058, blocked by 0060, retrying (60
sec)
…
^C
$ wineserver -k
$ chmod u+w ~/.wine/dosdevices
$ wine /path/to/exe
«everything works normally»

Curiously this doesn't affect built-in wine apps like notepad straight away,
but does cause it to deadlock if I file→open.

I want dosdevices to be readonly because wine fills it with tons of random
cruft I don't want there (way more serial ports than I actually have, a bevy of
ephemeral removable drives and/or network mounts) every time it starts up.

Making dosdevices readonly worked fine in older versions, 8.x or 9.x series
perhaps, although https://forum.winehq.org/viewtopic.php?t=27922 reports a
similar issue in 2016

If this is considered not-a-bug, how can I manually manage the drives available
within wine instead of having a bunch of pseudorandom nonsense auto-filled
every time I start wine?