Compiz errors in xsession log after client hung on drag & drop

[Bernie Innocenti]

I started a drag & drop of a folder in Evolution, which reproducibly hangs after a few seconds, leaving the X server locked up with a grab.

I went to the text console and killed -9 the evolution process. Afterwards, I found following errors were in my ~/.xsession-errors log:

[4123:4384:530604721001:ERROR:platform_thread_posix.cc(251)] Not implemented reached in static void base::PlatformThread::SetThreadPriority(base::PlatformThreadHandle, base::ThreadPriority)
[4123:4388:530623650931:ERROR:platform_thread_posix.cc(251)] Not implemented reached in static void base::PlatformThread::SetThreadPriority(base::PlatformThreadHandle, base::ThreadPriority)
[4635:4635:531448181371:ERROR:tab_strip_gtk.cc(1265)] Not implemented reached in virtual void TabStripGtk::StopAllHighlighting()
[4464:4473:531907220991:ERROR:platform_thread_posix.cc(251)] Not implemented reached in static void base::PlatformThread::SetThreadPriority(base::PlatformThreadHandle, base::ThreadPriority)
[4635:4635:532239675354:ERROR:x11_util.cc(1121)] X Error detected: serial 108952718, error_code 10 (BadAccess (attempt to access private resource denied)), request_code 142, minor_code 1 (X_ShmAttach)
[4635:4635:532239675904:ERROR:x11_util.cc(1121)] X Error detected: serial 108952719, error_code 159 (BadShmSeg (invalid shared segment parameter)), request_code 142, minor_code 3 (X_ShmPutImage)
[4635:4635:532239676300:ERROR:x11_util.cc(1121)] X Error detected: serial 108952728, error_code 159 (BadShmSeg (invalid shared segment parameter)), request_code 142, minor_code 2 (X_ShmDetach)

** (gnome-settings-daemon:4292): WARNING **: Sink callback failure

[Bernie Innocenti (codewiz)]

This is Ubuntu Precise running

 compiz_1:0.9.7.8-0ubuntu1.4
 unity_5.14.0-0ubuntu1
 xserver-xorg_1:7.6+12ubuntu1.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[JOSEPH E CONNER (joeconner2007)]

Simple drag and drop fails after upgrading from 17.04 to 17.10. The grab gets locked, and the only way I have found to break it is logging out.