seg fault in Fedora 25 with all desktop managers marco error 4 in libX11-xcb.so.1.0.0

[Felix Miata]

Robert Kudyba composed on 2017-03-31 23:09 (UTC-0400):
...
 > https://bugs.freedesktop.org/show_bug.cgi?id=100520
...
If you mentioned which gfxchip or CPU you have in your OP or the bug, I missed 
it. Is it possible your gfxchip makes the following applicable?

* From Linux 4.8, several changes have been made in the kernel
    configuration to 'harden' the system, i.e. to mitigate security bugs.
    Some changes may cause legitimate applications to fail, and can be
    reverted by run-time configuration:
    - On most architectures, the /dev/mem device can no longer be used to
      access devices that also have a kernel driver.  This breaks dosemu
      and some old user-space graphics drivers.  To allow this, set the
      kernel parameter: iomem=relaxed
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Felix Miata  ***  http://fm.no-ip.com/