With 3.4.2, I got a few of those:
# fgrep -1 "BUG: Bad rss-counter state" kern.log
Jun 10 17:35:57 mail kernel: [436940.510027] BUG: Bad rss-counter state mm:f09c8700 idx:1 val:-2
Jun 10 17:35:57 mail kernel: [436940.510044] BUG: Bad rss-counter state mm:f09c8700 idx:2 val:2
Jun 14 08:52:09 mail kernel: [314161.698470] BUG: Bad rss-counter state mm:f052c700 idx:1 val:-4
Jun 14 08:52:09 mail kernel: [314161.698487] BUG: Bad rss-counter state mm:f052c700 idx:2 val:4
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Ralf Hildebrandt Charite Universitätsmedizin Berlin
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