Can you figure out where in the vncpasswd code it's locking up? That
would help diagnose the issue. If you're using an RPM-based system, you
can install the turbovnc-debuginfo RPM and get a stack trace from gdb
when it locks up. Otherwise, you'll have to build vncpasswd from
source, but it's straightforward.
This is a complete shot in the dark, but I'm wondering if maybe the
/dev/urandom device is somehow giving you problems on some of your
machines. vncpasswd will read from /dev/urandom when it generates an
OTP. If that is the problem, then adding
#undef UseDevUrandom
to the top of vncpasswd.c should temporarily work around it, and it
would be easy to add a more permanent workaround (a command line switch
that avoids using /dev/urandom.)
On 10/23/13 1:36 PM, Rafael Guimaraes wrote:
> Hi,
>
> I have created a VNC session and after using it for sometime, it seems
> to be "locked". It is configured to use one-time-passwords and I just
> can't generate a new otp for access the session, vncpasswd hangs
> indefinitely when trying to get a new password.
>
> The session was created by the following command line:
> /opt/TurboVNC/bin/Xvnc :13 -desktop X -httpd
> /opt/TurboVNC/bin/../vnc/classes -auth /u/cnhu/.Xauthority
> -dontdisconnect -geometry 3192x1046 -depth 24 -rfbwait 120000 -otpauth
> -rfbport 5913 -fp
> /usr/share/X11/fonts/misc,/usr/share/X11/fonts/75dpi,/usr/share/X11/fonts/100dpi,/usr/share/X11/fonts/Type1,/usr/share/fonts/default/Type1
> -co /usr/share/X11/rgb -deferupdate 1
>
> When trying to launch a "vncpasswd -otp -display :13", I get no response
> and eventually I have to press Ctrl+C. I have runned the vncpasswd
> command line with strace and it seems to hang while trying to connect to
> Xvnc through the "/tmp/.X11-unix/X13" socket (not sure if I've got it
> right). Below you may check the end of the strace (until it hangs).
>
> What may the problem be? The same happened twice in two different
> machines. I have several other VNC sessions where this does not happen.
> Can I collect information from anywhere else that could help me trying
> to figure out what happened?
>
> uname({sys="Linux", node="server03", ...}) = 0
> socket(PF_FILE, SOCK_STREAM, 0) = 3
> uname({sys="Linux", node="server03", ...}) = 0
> uname({sys="Linux", node="server03", ...}) = 0
> connect(3, {sa_family=AF_FILE, path="/tmp/.X11-unix/X13"...}, 20) = 0
> uname({sys="Linux", node="server03", ...}) = 0
> fcntl(3, F_SETFD, FD_CLOEXEC) = 0
> access("/u/cnhu/.Xauthority", R_OK) = 0
> open("/u/cnhu/.Xauthority", O_RDONLY) = 4
> fstat(4, {st_mode=S_IFREG|0600, st_size=13139, ...}) = 0
> mmap(NULL, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> 0) = 0x2ab9583b5000
> read(4, "\1\0\0\10mi080113\0\00210\0\22MIT-MAGIC-COOK"..., 32768) = 13139
> read(4, "", 32768) = 0
> close(4) = 0
> munmap(0x2ab9583b5000, 32768) = 0
> writev(3, [{"l\0\v\0\0\0\22\0\20\0\0\0", 12}, {"MIT-MAGIC-COOKIE-1",
> 18}, {"\0\0", 2}, {"e\30\226A>\316@\17Y8\365+V\21\365\f", 16}], 4) = 48
> fcntl(3, F_GETFL) = 0x2 (flags O_RDWR)
> fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
> read(3, 0x7fff0b98aab0, 8) = -1 EAGAIN (Resource
> temporarily unavailable)
> poll([{fd=3, events=POLLIN}], 1, -1 <unfinished ...>
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