bug#34051: 27.0.50; Emacs 27 from master segfaults

[Eli Zaretskii]

> From: stefan-husmann@t-online.de
> Date: Sat, 12 Jan 2019 16:46:53 +0100
> 
> 
> Emacs segfaults immediately for me under Arch Linux 64 bit. This happens with 
> commit
> a1b7a3f2a3957a399d6c3c7bcffa07ac67da82fc and upwards.
> 
> Commit c342b26371480316024e1e5d63cd8b3f035dda69 works fine.
> 
> With emacs -Q the segfault does not happen immediately, but it happened
> whe I tried to open this bug report.
> 
> [haawda@frege ~]$ emacs
> X protocol error: BadMatch (invalid parameter attributes) on protocol request 
> 139
> Fatal error 6: Aborted

Please run Emacs under a debugger, set x-synchronize to the value of
t, then reproduce the problem, and post the backtrace shown by GDB.

Thanks.