[Mono-bugs] [Bug 385006] New: Running mono in a Xen domU fills syslog with " 4gb seg fixup" messages

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Tue Apr 29 17:43:59 EDT 2008


           Summary: Running mono in a Xen domU fills syslog with "4gb seg
                    fixup" messages
           Product: Mono: Runtime
           Version: 1.9.0
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: misc
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: adeason2 at uiuc.edu
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---

I am trying to run mono in a Xen unprivileged domain, which produces many lines
like the following in syslog:

Apr 29 16:23:57 www2 kernel: 4gb seg fixup, process cli (pid 5723), cs:ip

Mono runs correctly, but these messages are annoying, and (to my knowledge)
indicate a performance penalty.

I saw on http://www.mono-project.com/Compiling_Mono#Xen_Support that there is a
configure-time flag to enable xen-specific code. I tried reconfiguring and
recompiling mono with `--with-xen_opt=yes`, but the above messages are still
produced with no change.

This is on Debian etch, kernel 2.6.18-xen-686, mono 1.9.1 (and also occurred
with 1.2.6). Specifically, we're running mono for the mod_mono Apache module.

I should also note that no other process is producing these log messages, so
this would appear to be a mono-specific issue, and not just a result of e.g.
having the wrong libc installed.

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