On Monday, 11 of February 2008, Alessandro Suardi wrote:
quoted text
> On Feb 9, 2008 6:10 PM, Alessandro Suardi <alessandro.suardi@gmail.com> wrote:
> > I finally had a bit of time to try out different kernel versions to find
> >  out where this began... and it's in 2.6.24-git2.
> >
> > What happens: Oracle 11g starts up and forks a number of so
> >  called background processes. Starting in  2.6.24-git2 the VKTM
> >  process never fully completes its initialization but gets in R state,
> >  never accumulating CPU, and can't be straced/gdb'd/killed.
> >
> > Sysrq-T reports for VKTM looks like this
> >
> > Feb  9 16:10:46 sandman kernel:  =======================
> > Feb  9 16:10:46 sandman kernel: oracle        R running   2684  2258      1
> > Feb  9 16:10:46 sandman kernel:        f591dfb0 00200086 f6bbc3c4
> > f6863cc0 c010547a 00000000 b794f62c b7b70600
> > Feb  9 16:10:46 sandman kernel:        b79453dc f591d000 c0103caa
> > b794f62c b7943708 b79453e4 b7b70600 b79453dc
> > Feb  9 16:10:46 sandman kernel:        bfb0dd5c b79500b0 0000007b
> > 0000007b c0320000 ffffffff 0e072d7a 00000073
> > Feb  9 16:10:46 sandman kernel: Call Trace:
> > Feb  9 16:10:46 sandman kernel:  [<c010547a>] ? do_IRQ+0xac/0xc1
> > Feb  9 16:10:46 sandman kernel:  [<c0103caa>] work_resched+0x5/0x16
> > Feb  9 16:10:46 sandman kernel:  [<c0320000>] ? pci_setup+0xb3/0x104
> > Feb  9 16:10:46 sandman kernel:  =======================
> >
> >
> > 2.6.24-git1 is okay
> > 2.6.24-git2 is bad
> > ...
> > 2.6.24-git20 is bad
> >
> > Only differences in kernel .config between -git1 and -git2 are
> >
> > [asuardi@sandman src]$ diff .config-2.6.24-git[12]
> > 3,4c3,4
> > < # Linux kernel version: 2.6.24-git1
> > < # Sat Jan 26 01:04:43 2008
> > ---
> > > # Linux kernel version: 2.6.24-git2
> > > # Sat Jan 26 12:10:15 2008
> > 121a122,123
> > > CONFIG_CLASSIC_RCU=y
> > > # CONFIG_PREEMPT_RCU is not set
> > 187a190
> > > # CONFIG_RCU_TRACE is not set
> > 230a234
> > > # CONFIG_SCHED_HRTICK is not set
> > 755a760
> > > # CONFIG_PATA_NINJA32 is not set
> > 1807a1813
> > > # CONFIG_LATENCYTOP is not set
> >
> > Symptom is similar to what Rafael reported here
> >
> >   http://www.ussg.iu.edu/hypermail/linux/kernel/0801.3/4114.html
> >
> >  and similarly VKTM attempts to run at elevated priority as normal
> >  user process (Oracle kernel binary is not setuid root).

Yes, I think this is the same problem.  Please try to unset CONFIG_GROUP_SCHED
and see if that helps.

quoted text
> > Peter Zijlstra's patches mentioned in the above thread, at
> >
> >  http://programming.kicks-ass.net/kernel-patches/sched-rt-group ,
> >
> >  do not appear to be in -git20 yet.
> >
> >
> > I'm available for further testing. Thanks, ciao,
> 
> Only to add that 2.6.25-rc1 is still broken.

Yes, it is.

Thanks,
Rafael
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