IRQ deadlocks

[Heinz Mauelshagen]

> 
> Matthew Jacob wrote:
> > 
> > You should always note that this is with Linux- not FreeBSD- and
> > the answer is, yes, on occasion I certainly do.
> > 
> > And you shouldn't be putting Linux SMP into a production environment
> > unless you know what you're doing.
> > 
> > On Sun, 20 Sep 1998, System Administrator wrote:
> > 
> > > anybody get IRQ deadlocks on their motherboard? If so, have you found them
> > > related to the SCSI drivers? My servers doesn't tell me crap about them?
> > > Just IRQ DEADLOCK DETECTED BY CPU 0 or CPU 12 (I run SMP) and the syslog
> > > doesn't say a dang thing.
> > >
> > > running caldera linux, kernel 2.0.35 with pre7 drivers on an intel
> > > providence motherboard, adaptec 7880 chipset.
> > >
> > > sorry if this may be a bit off topic, it's just tickin me off since this
> > > server's in a production environment, i'm trying to get all hardware
> > > views.
> 
> Disable SMP and live a happy life.  That, or downgrade the kernel to version
> 2.0.33 and patch in the latest driver.  The thing is, I have information
> from a kernel deadlock where in I gathered the EIP information using the
> print EIP patch, and the deadlock isn't related to the aic7xxx driver at all
> (however, a faster disk subsystem will trigger the problem more often).  It
> appears to be a generic vm bug in the 34 and 35 kernels under SMP.  With SMP
> disabled, all is fine.  With 2.0.33, all was fine.  FWIW, the bug probably
> existed in 2.0.33 as well, but for 2.0.34 thye made a change to the vm
> subsystem that allowed swapping of shared COW pages (which 2.0.33 didn't do)
> and this appears to have made it much easier to trigger the actual bug,
> which is somewhere in the fork() code.  That's my take on it anyway.
> 

Does the vm bug show up in kernel > 2.1.120 on SMP too?

Regards, Heinz

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Systemmanagement Entwicklungsbereich 2           Deutsche Telekom AG
                                                 Entwicklungszentrum Darmstadt
Heinz Mauelshagen                                Otto-Roehm-Strasse 71c
                                                 Postfach 10 05 41
mge at ez-darmstadt.telekom.de                      64205 Darmstadt
                                                 Germany
                                                 +49 6151 886-425
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