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Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHEA-2015-2198.html
Description of problem: When trying to connect to XDMCP via Xnest or Xephyr they both crash immediately, see the log below. Version-Release number of selected component (if applicable): xorg-x11-server-Xephyr-1.15.0-31.el7 xorg-x11-server-Xnest-1.15.0-31.el7 How reproducible: 100% Steps to Reproduce: 1. kdm --nodeamon with enabled Xdmcp running, 177 udp port opened, firewall down 2. [Xephyr|Xnest] :99 -query i386-6c-m1.ss.eng.bos.redhat.com 3. Actual results: Xephyr -query i386-6c-m1.ss.eng.bos.redhat.com :99 Initializing built-in extension Generic Event Extension Initializing built-in extension SHAPE Initializing built-in extension MIT-SHM Initializing built-in extension XInputExtension Initializing built-in extension XTEST Initializing built-in extension BIG-REQUESTS Initializing built-in extension SYNC Initializing built-in extension XKEYBOARD Initializing built-in extension XC-MISC Initializing built-in extension XINERAMA Initializing built-in extension XFIXES Initializing built-in extension RENDER Initializing built-in extension RANDR Initializing built-in extension COMPOSITE Initializing built-in extension DAMAGE Initializing built-in extension MIT-SCREEN-SAVER Initializing built-in extension DOUBLE-BUFFER Initializing built-in extension RECORD Initializing built-in extension DPMS Initializing built-in extension Present Initializing built-in extension X-Resource Initializing built-in extension XVideo Initializing built-in extension XVideo-MotionCompensation Initializing built-in extension SELinux Initializing built-in extension GLX (EE) Fatal server error: (EE) (EE) BUG: triggered 'if (f[f_idx])' (EE) BUG: log.c:467 in pnprintf() (EE) Unsupported printf directive '*' (EE) (EE) Backtrace: (EE) 0: Xephyr (xorg_backtrace+0x55) [0x583f95] (EE) 1: Xephyr (LogVMessageVerbSigSafe+0x875) [0x58f1d5] (EE) 2: Xephyr (FatalError+0xea) [0x58f4ca] (EE) 3: Xephyr (0x400000+0x19163b) [0x59163b] (EE) 4: Xephyr (0x400000+0x191c4d) [0x591c4d] (EE) 5: Xephyr (WakeupHandler+0x6d) [0x44c4bd] (EE) 6: Xephyr (WaitForSomething+0x1cf) [0x58193f] (EE) 7: Xephyr (0x400000+0x47751) [0x447751] (EE) 8: Xephyr (0x400000+0x4b95a) [0x44b95a] (EE) 9: /lib64/libc.so.6 (__libc_start_main+0xf5) [0x7f5e05519af5] (EE) 10: Xephyr (0x400000+0x268e1) [0x4268e1] (EE) XDMCP fatal error: Manager unwilling %*.*s (EE) Expected results: should not crash on client site Additional info: rhel7, rhel6 and Fedora affected too