Andreas: Thank you for the advice. I have tried it but unfortunately the 
workaround didn't work. The only change I experienced was the absence of the 
lines like these in dmesg:
[ 1729.565018] sr 2:0:0:0: timing out command, waited 60s
[ 1849.569021] sr 2:0:0:0: timing out command, waited 120s
[ 1849.569047] sr 2:0:0:0: timing out command, waited 120s

May I ask you to suggest me a way to isolate/track down the problem(e.g.
removing unnecessary modules)?

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ksoftirqd/1 using 50% CPU or above
https://bugs.launchpad.net/bugs/183461
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