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    SubjectRe: 2.6.24-git2: Oracle 11g VKTM process enters R state on startup and is unkillable [still broken in 2.6.25-rc1]
    Date
    On Monday, 11 of February 2008, Alessandro Suardi wrote:
    > 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.

    > > 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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