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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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