On Thursday, 27 November 2003 at 0:13:09 -0600, Cosmin Stroe wrote: > On Thu, 27 Nov 2003, Greg 'groggy' Lehey wrote: > >> On Wednesday, 26 November 2003 at 12:04:52 -0600, Cosmin Stroe wrote: >>> >>> I am using vinum atm, and I am having serious problems with it. After >>> about 16 hrs of writing data to a vinum volume via NFS at a constant data >>> stream of 200k/sec and reading at 400k/sec at the same time, the whole >>> machine just freezes, hard. The only thing I can do is reboot. This >>> behavior appears in 4.8 and 5-CURRENT. I have no indication of what is >>> wrong, or how to go about finding it out. The problem is either with NFS >>> or Vinum, and I'm leaning towards Vinum (because of the failure in both >>> -STABLE and -CURRENT). >>> >>> I'm not the kind of person that relies on other people, and I like to fix >>> my own problems, but this is a problem which I cannot fix at this time. >>> So, I'm planning to look through the code of vinum and start messing with >>> it to figure out how it works and how to debug it. >> >> This is unlikely to get you very far. Some more details (offline if >> you prefer) would be handy, but as you say, you can't even be sure >> that it's Vinum. The best thing would be to get the system into the >> kernel debugger at the point of freeze, if that's possible, and try to >> work out what has happened. > > Quick question: If this is a software problem with vinum, there > should be no way it can hard lock a machine. Is this assumption > correct ?
Heh. Depends on what you mean by a software problem. The right kind of software problem anywhere can hard lock machines :-( > I should be able to invoke the kernel debugger by pressing the > hotkey (ctrl+alt+esc) while the machine is locked and get a > backtrace (altho i'd be in an ISR servicing the hotkey, so i'm not > sure it'd do much good). It would enable you to look around and figure out what's gone wrong. > Any special suggestions on debugging this kind of freezing problem ? > The hardware has been tested and it's good (CPU,RAM,HDs). (some kind > of watchdog in software ??) I have some debugging help in Vinum which will log what's going on, but it doesn't help much in the case of a hard freeze. It could be a deadlock. Do you have swap on Vinum? Greg -- See complete headers for address and phone numbers.
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