[Bug 50106] New: ESync broke mountmgr

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50106

Bug ID: 50106
           Summary: ESync broke mountmgr
           Product: Wine-staging
           Version: 5.19
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail], [e-mail]
      Distribution: ---

After wine update 5.19 (gb49e8743) to 5.21 (ge2d9f97b) mountmgr just stop
working on my setup. Symptoms are constant spamming:
> fixme:service:scmdatabase_autostart_services Auto-start service L"MountMgr" failed to start: 50
> fixme:service:scmdatabase_autostart_services Auto-start service L"winebus" failed to start: 50

And winecfg can't connect to Mount Manager, installers (e.g. GoG installer)
doesn't display anything on directory select. If you disable esync\fsync using
env variables, it works.

It seems like this bug appears on 5.19 (gbe9c9681) and newest wine-staging
versions.

Oddly, with WINEDEBUG=+all it works (slowly, but works). Some race condition in
ESync?

How to reproduce:
- Create new wine prefix
- Launch winecfg (issue not occurs)
- Close winecfg
- Launch winecfg again (issue occurs)

After that issue will occurs every time.