For me, running under strace doesn't result in a "crash". That is, "calibre --detach" doesn't work, but "strace -o trace.txt -f calibre --detach" does work. I'm guessing it may be some user-specific setting. I created a new user just to test, and "calibre --detach" does work for the new user. I'm not imaginative enough to hazard a guess what's happening.
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