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    SubjectRe: [Bug #10815] 2.6.26-rc4: RIP find_pid_ns+0x6b/0xa0
    On Sun, Jun 15, 2008 at 08:31:26PM -0700, Paul E. McKenney wrote:
    > On Mon, Jun 16, 2008 at 07:01:54AM +0400, Alexey Dobriyan wrote:
    > > On Sun, Jun 15, 2008 at 04:38:24PM -0700, Linus Torvalds wrote:
    > > > On Sun, 15 Jun 2008, Paul E. McKenney wrote:
    > > > >
    > > > > If that is the right thing to do. I would feel better about it if I
    > > > > could reproduce the failure.
    > > >
    > > > Is there some configuration thing that might make it happen for Alexey but
    > > > not for you? The only obvious one is the normal PREEMPT thing, but
    > > > PREEMPT_RCU obviously depends on that, so there must be something else.
    > > >
    > > > CONFIG_SMP? CONFIG_NO_HZ? CONFIG_[RT|FAIR]_GROUP_SCHED? There's a number
    > > > of config options that change scheduling details..
    > >
    > > The only way I can "fix" rcutorture here is SMP=n (not maxcpus=1!).
    >
    > I am running SMP=y without seeing the problem.
    >
    > > Among things tried and do not matter are NO_HZ, HIGH_RES_TIMERS, turning off
    > > debugging options (one by one and in bulk), DEBUG_PER_CPU_MAPS, HZ tweaks,
    > > SCHED_MC.
    > >
    > > All of this doesn't help, but SMP=n does.
    >
    > Attached is the compressed config file I used for a run on a POWER
    > machine. I have used similar config files for x86. For this run, I built
    > LTP, installed it, started rcutorture, ran LTP, then ended rcutorture.
    >
    > The only other thing I can think of is that Alexey's machines are
    > somehow managing to nest NMIs or something. I can produce a fix for
    > that, but have no way of testing it.

    No NMIs here according to /proc/interrupts .

    CPU0 CPU1
    0: 42 0 IO-APIC-edge timer
    1: 8 0 IO-APIC-edge i8042
    8: 1 0 IO-APIC-edge rtc
    9: 0 0 IO-APIC-fasteoi acpi
    16: 0 0 IO-APIC-fasteoi ahci, uhci_hcd:usb1
    17: 35 0 IO-APIC-fasteoi pata_jmicron, uhci_hcd:usb2
    18: 0 0 IO-APIC-fasteoi ehci_hcd:usb3, uhci_hcd:usb6
    19: 6238 0 IO-APIC-fasteoi ata_piix, ata_piix, uhci_hcd:usb5
    22: 278 0 IO-APIC-fasteoi HDA Intel
    23: 2802 0 IO-APIC-fasteoi uhci_hcd:usb4, ehci_hcd:usb7, eth1
    319: 5126 0 PCI-MSI-edge eth0
    NMI: 0 0 Non-maskable interrupts
    LOC: 66777 66036 Local timer interrupts
    RES: 3031 3403 Rescheduling interrupts
    CAL: 17 62 function call interrupts
    TLB: 671 900 TLB shootdowns
    TRM: 0 0 Thermal event interrupts
    THR: 0 0 Threshold APIC interrupts
    SPU: 0 0 Spurious interrupts
    ERR: 0



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