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Why does my machine print “calcru: negative time…”?

April 26, 2017Machine negative print

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Why does my machine print “calcru: negative time…”?

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This can be caused by various hardware or software ailments relating to interrupts. It may be due to bugs but can also happen by nature of certain devices. Running TCP/IP over the parallel port using a large MTU is one good way to provoke this problem. Graphics accelerators can also get you here, in which case you should check the interrupt setting of the card first. A side effect of this problem are dying processes with the message “SIGXCPU exceeded cpu time limit”.