Messages in this thread | | | Subject | Re: [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks | From | Andi Kleen <> | Date | Sun, 02 Dec 2007 22:34:08 +0100 |
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Ingo Molnar <mingo@elte.hu> writes: > > do you realize that more than 120 seconds TASK_UNINTERRUPTIBLE _is_ > something that most humans consider as "buggy" in the overwhelming > majority of cases, regardless of the reason? Yes, there are and will be > some exceptions, but not nearly as countless as you try to paint it. A > quick test in the next -mm will give us a good idea about the ratio of > false positives.
That would assume error paths get regularly exercised in -mm. Doubtful. Most likely we'll only hear about it after it's out in the wild on some bigger release.
The problem I have with your patch is that it will mess up Linux (in particular block/network file system) error handling even more than it already is. In error handling cases such "unusual" things happen frequently unfortunately.
I used to fight with this with the NMI watchdog on on x86-64 -- it tended to trigger regularly on SCSI error handlers for example disabling interrupts too long while handling the error. They eventually got all fixed, but with that change they will likely all start throwing nasty messages again.
And usually it is not simply broken code neither but really doing something difficult.
-Andi
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