M. Koehrer wrote: > Hi everybody, > > after a hard day of debugging we finally detected a bug in rtnet which led to > the issue. > I have enclosed a patch for rtnet-0.9.3 that fixes the bug and makes the > function __rtskb_fifo_remove > really interrupt save. > Jan, thanks for your great support! Can you please check that patch into > subversion?
You got! Please hand me a brown paper bag. The problem is that we first read the content of the next FIFO slot and then check if there is actually something enqueued. If the FIFO reader gets preempted right between those two ops by the writer and the FIFO then changes its state from empty to non-empty, the previously read slot entry is wrongly declared valid belatedly - ouch. Ok, this is a critical fix for all 0.9.3 users! Please update to SVN head or apply Mathias's patch. I will try to roll out 0.9.4 over this weekend. People on 0.9.2 or earlier are not affected. Many thanks back to Mathias for patiently tracking down and fixing the issue! Jan
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