reassign 901497 retitle 901497 Xwayland: hangs spinning on write and SIGALRM thanks
After further investigation, I can reproduce this with Mesa 18.0.5-1 as well, just not as often. After encountering this issue, I managed to switch to a text console, and found that Xwayland was using 100% CPU. strace of the running Xwayland produced the attached strace, in which Xwayland appears to be spinning, running a zero-byte writev, and periodically processing a SIGALRM. Other threads appear to be blocked on futexes. - Josh Triplett
