Created attachment 5234
Proposed patch, suitable for 4.6, 4.8, 4.10 and perhaps later
"Client" object is still queued for drawing frame, while the window is destroyed. If that happens quickly, "Client" object would be freed by clientUnframe, before drawing the frame for the first time.
This bug is rather old, but still happens in 4.10.0. Perhaps related to #10365. And exactly the same as https://bugzilla.redhat.com/show_bug.cgi?id=879696
#0 0x00007fb807921a38 in __strchr_sse42 () from /lib64/libc.so.6
#1 0x000000000041f7a3 in frameDrawWin (c=c@entry=0x1669780) at frame.c:964
#2 0x0000000000420f7e in update_frame_idle_cb (data=0x1669780) at frame.c:1224
#3 0x00007fb809072a55 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#4 0x00007fb809072d88 in g_main_context_iterate.isra.24 () from /lib64/libglib-2.0.so.0
#5 0x00007fb809073182 in g_main_loop_run () from /lib64/libglib-2.0.so.0
#6 0x00007fb80b1acfd7 in gtk_main () from /lib64/libgtk-x11-2.0.so.0
#7 0x000000000040b773 in main (argc=1, argv=0x7fffc0142d48) at main.c:627
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