Xvnc hangs and uses 100% CPU

[Martin Trautmann-4]

Hi,

I am using OpenSuSE 11.1 with the following vnc rpm packages:
tightvnc-1.3.9-80.44
xorg-x11-Xvnc-7.4-17.6.1

I assume that X.org Xvnc and tightvnc are developed together and thus I
hope that this is the correct mailing list for an Xvnc problem.

I am running vncserver/Xvnc as a stand alone VNC server and connect
using multiple vncviewer from Linux and Windows. This works well most of
the time but I had the following problem twice:
1) suddenly all vncviewer don't refresh the screen any more
2) Xvnc uses 100% of the CPU
3) "strace -p <PID>" results in no output

I conclude that Xvnc hangs which is especially problematic if there is a
production system control application running within the VNC
environment.

Does anyone know of other occurances of a similar problem?

Does anyone know a way to migrate a running X client out of the crashed
Xvnc environment and connect it to a newly started X server?

Assuming I figure out how to export the regular :0 display using Xvnc.
Do you think that in case a similar problem occurs, the local display
would still be accessible using the physical console (VGA monitor+PS/2
keyboard)?

kind regards,

Martin

P.S: Some more diagnostics:

# CPU: 64 bit Intel Xeon

# file /usr/bin/Xvnc
/usr/bin/Xvnc: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), for
GNU/Linux 2.6.4, dynamically linked (uses shared libs), stripped

# ldd /usr/bin/Xvnc
        linux-vdso.so.1 =>  (0x00007ffffb3ff000)
        libjpeg.so.62 => /usr/lib64/libjpeg.so.62 (0x00007f713d06e000)
        libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007f713ce31000)
        libpixman-1.so.0 => /usr/lib64/libpixman-1.so.0
(0x00007f713cbed000)
        libcrypto.so.0.9.8 => /usr/lib64/libcrypto.so.0.9.8
(0x00007f713c870000)
        libXmuu.so.1 => /usr/lib64/libXmuu.so.1 (0x00007f713c66c000)
        libXrender.so.1 => /usr/lib64/libXrender.so.1
(0x00007f713c462000)
        libXfont.so.1 => /usr/lib64/libXfont.so.1 (0x00007f713c1e7000)
        libfreetype.so.6 => /usr/lib64/libfreetype.so.6
(0x00007f713bf62000)
        libfontenc.so.1 => /usr/lib64/libfontenc.so.1
(0x00007f713bd5a000)
        libz.so.1 => /lib64/libz.so.1 (0x00007f713bb44000)
        libXi.so.6 => /usr/lib64/libXi.so.6 (0x00007f713b93a000)
        libXext.so.6 => /usr/lib64/libXext.so.6 (0x00007f713b728000)
        libX11.so.6 => /usr/lib64/libX11.so.6 (0x00007f713b3eb000)
        libxcb-xlib.so.0 => /usr/lib64/libxcb-xlib.so.0
(0x00007f713b1e9000)
        libxcb.so.1 => /usr/lib64/libxcb.so.1 (0x00007f713afcd000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00007f713adc9000)
        libXau.so.6 => /usr/lib64/libXau.so.6 (0x00007f713abc5000)
        libXdmcp.so.6 => /usr/lib64/libXdmcp.so.6 (0x00007f713a9bf000)
        libm.so.6 => /lib64/libm.so.6 (0x00007f713a769000)
        librt.so.1 => /lib64/librt.so.1 (0x00007f713a560000)
        libc.so.6 => /lib64/libc.so.6 (0x00007f713a207000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f713d292000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f7139feb000)


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