Created attachment 137413 [details] dmesg output Reproducible running compiz on mate, on FC27. I can reproduce this fairly consistently, if enabling emerald window decorations, though it can fail with GTK+ decorations as well. Using Alt-Tab to switch between windows triggers this problem. Only the process is hanging, SIGKILL is needed to restart the process. Stack trace attached in stack.txt Library version list attached in vers.txt Full dmesg output attached in dmesg.txt I'm fairly certain I've miscategorized this bug.
Created attachment 137414 [details] stack trace
Created attachment 137415 [details] version list
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