Re: [PATCH,RFC] RCU-based detection of stalled CPUs for Classic RCU

From: Paul E. McKenney
Date: Thu Oct 02 2008 - 13:43:34 EST

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On Thu, Oct 02, 2008 at 11:10:46AM -0400, Mathieu Desnoyers wrote:
> * Paul E. McKenney (paulmck@xxxxxxxxxxxxxxxxxx) wrote:
> > On Thu, Oct 02, 2008 at 10:07:26AM +0200, Ingo Molnar wrote:
> > >
> > > * Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> wrote:
> > >
> > > > Hello!
> > > >
> > > > This patch adds stalled-CPU detection to Classic RCU. This capability
> > > > is enabled by a new config variable CONFIG_RCU_CPU_STALL_DETECTOR,
> > > > which defaults disabled. This is a debugging feature, not something
> > > > that non-kernel-hackers would be expected to care about. This feature
> > > > can detect looping CPUs in !PREEMPT builds and looping CPUs with
> > > > preemption disabled in PREEMPT builds. This is essentially a port of
> > > > this functionality from the treercu patch.
> > > >
> > > > One current shortcoming: on some systems, stalls are detected during
> > > > early boot, when we normally would not care about them. My thought is
> > > > to add a call from late initialization to suppress stall detection
> > > > until the system is well along its way to being booted, but thought I
> > > > should check to see if there might already be something for this
> > > > purpose.
> > >
> > > could you be a bit more specific, why do those warnings show up and why
> > > dont we care about them? There are things like networking that
> > > occasionally do an rcu_sync() and a stall could mean a bootup hang.
> >
> > Hmmm...
> >
> > Good point, I was just falling back on my old "we don't care about RCU
> > stalls in boot-time code" rule from long ago. It is entirely possible
> > (in fact reasonably likely) that this rule no longer applies to Linux as
> > it exists today. So please see below for the console output. Not all
> > systems report this stall. I have recently been running only on Power
> > systems, will fire off on some x86s. My kneejerk reaction was that the
> > "stall" was really due to the clock-setting operation -- RCU stalls are
> > based on get_seconds().
> >
> > So maybe I need to change the stall-detection code to use jiffies
> > instead.
> >
> > Thoughts?
> >
>
> You could possibly use get monotonic time, which should hopefully be a
> bit better than its NTP-corrected alternatives.

OK. I thought jiffies were monotonic (though not perfectly correlated
to the passage of time). This is a warning timeout, so does not need
better than a few percent accuracy, as long as time never jumps too far.

But what API did you have in mind?

> Also, do you have all the tools you need to poinpoint the precise source
> of RCU stalls ? I haven't looked at RCU trace, but I should say adding a
> new tracepoint to instrument RCU callback execution at boot time and to
> trace it with LTTng is close to trivial. (actually, very early kernel
> boot is not so trivial as we would have to create a small kernel module
> to activate lttng tracing, but tracing the early phases of userspace
> bootup is trivial given we can use the userspace API).

I just dump stack, which historically worked pretty well.

Could you please tell me more about what you think should be added?

Thanx, Paul

> Mathieu
>
> > > > (Currently against 2.6.27-rc8, FYI.)
> > > >
> > > > Thoughts?
> > > >
> > > > Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
> > >
> > > i think this is a very good idea in general - often the question comes
> > > up whether a hang seen in the RCU code is indeed caused by RCU or other
> > > factors. Could you perhaps rebase it against tip/core/rcu ? [or
> > > tip/master for convenience]
> >
> > Will do!
> >
> > Thanx, Paul
> >
> > ------------------------------------------------------------------------
> > Console output: search for "RCU detected CPU 5 stall" near the end.
> > ------------------------------------------------------------------------
> >
> > Elapsed time since release of system processors: 7742 mins 58 secs
> >
> > Config file read, 2048 bytes
> > Welcome
> > Welcome to yaboot version 1.3.13-cas (Red Hat 1.3.13.cas-5)
> > Enter "help" to get some basic usage information
> > boot: autobench
> > Please wait, loading kernel...
> > Elf64 kernel loaded...
> > Loading ramdisk...
> > ramdisk loaded at 02b00000, size: 2331 Kbytes
> > OF stdout device is: /vdevice/vty@30000000
> > Hypertas detected, assuming LPAR !
> > -\|/-\|/-\|/-\|
> > Elapsed time since release of system processors: 7743 mins 29 secs
> >
> > Config file read, 2048 bytes
> > Welcome
> > Welcome to yaboot version 1.3.13-cas (Red Hat 1.3.13.cas-5)
> > Enter "help" to get some basic usage information
> > boot: autobench
> > Please wait, loading kernel...
> > Elf64 kernel loaded...
> > Loading ramdisk...
> > ramdisk loaded at 02b00000, size: 2331 Kbytes
> > OF stdout device is: /vdevice/vty@30000000
> > Hypertas detected, assuming LPAR !
> > command line: ro console=hvc0 autobench_args: root=/dev/sda6
> > ABAT:1222922465
> > memory layout at init:
> > alloc_bottom : 0000000002d47000
> > alloc_top : 0000000008000000
> > alloc_top_hi : 0000000008000000
> > rmo_top : 0000000008000000
> > ram_top : 0000000008000000
> > Looking for displays
> > instantiating rtas at 0x000000000757a000 ... done
> > boot cpu hw idx 0000000000000000
> > starting cpu hw idx 0000000000000002... done
> > starting cpu hw idx 0000000000000004... done
> > starting cpu hw idx 0000000000000006... done
> > copying OF device tree ...
> > Building dt strings...
> > Building dt structure...
> > Device tree strings 0x0000000002f48000 -> 0x0000000002f49537
> > Device tree struct 0x0000000002f4a000 -> 0x0000000002f58000
> > Calling quiesce ...
> > returning from prom_init
> > Using pSeries machine description
> > Using 1TB segments
> > Found initrd at 0xc000000002b00000:0xc000000002d46c00
> > console [udbg0] enabled
> > Partition configured for 8 cpus.
> > CPU maps initialized for 2 threads per core
> > Starting Linux PPC64 #1 SMP PREEMPT Thu Oct 2 00:39:54 EDT 2008
> > -----------------------------------------------------
> > ppc64_pft_size = 0x19
> > physicalMemorySize = 0x80000000
> > htab_hash_mask = 0x3ffff
> > -----------------------------------------------------
> > Initializing cgroup subsys cpuset
> > Linux version 2.6.27-rc7-autokern1 (root@xxxxxxxxxxxxxxxxxxxxxxx) (gcc
> > version 4.1.2 20071124 (Red Hat 4.1.2-42)) #1 SMP PREEMPT Thu Oct 2
> > 00:39:54 EDT 2008
> > [boot]0012 Setup Arch
> > EEH: No capable adapters found
> > PPC64 nvram contains 15360 bytes
> > Zone PFN ranges:
> > DMA 0x00000000 -> 0x00080000
> > Normal 0x00080000 -> 0x00080000
> > Movable zone start PFN for each node
> > early_node_map[2] active PFN ranges
> > 0: 0x00000000 -> 0x00044000
> > 1: 0x00044000 -> 0x00080000
> > [boot]0015 Setup Done
> > Built 2 zonelists in Node order, mobility grouping on. Total pages:
> > 517120
> > Policy zone: DMA
> > Kernel command line: ro console=hvc0 autobench_args: root=/dev/sda6
> > ABAT:1222922465
> > Experimental hierarchical RCU implementation.
> > RCU-based detection of stalled CPUs is enabled.
> > Experimental hierarchical RCU init done.
> > [boot]0020 XICS Init
> > [boot]0021 XICS Done
> > PID hash table entries: 4096 (order: 12, 32768 bytes)
> > clocksource: timebase mult[7d0000] shift[22] registered
> > Console: colour dummy device 80x25
> > console handover: boot [udbg0] -> real [hvc0]
> > Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)
> > Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)
> > freeing bootmem node 0
> > freeing bootmem node 1
> > Memory: 2038156k/2097152k available (7200k kernel code, 58996k reserved,
> > 1052k data, 513k bss, 292k init)
> > SLUB: Genslabs=13, HWalign=128, Order=0-3, MinObjects=0, CPUs=8,
> > Nodes=16
> > Calibrating delay loop... 915.45 BogoMIPS (lpj=1830912)
> > Mount-cache hash table entries: 256
> > Initializing cgroup subsys ns
> > Initializing cgroup subsys cpuacct
> > Processor 1 found.
> > Processor 2 found.
> > Processor 3 found.
> > Processor 4 found.
> > Processor 5 found.
> > Processor 6 found.
> > Processor 7 found.
> > Brought up 8 CPUs
> > net_namespace: 1152 bytes
> > NET: Registered protocol family 16
> > IBM eBus Device Driver
> > PCI: Probing PCI hardware
> > SCSI subsystem initialized
> > usbcore: registered new interface driver usbfs
> > usbcore: registered new interface driver hub
> > usbcore: registered new device driver usb
> > NET: Registered protocol family 2
> > IP route cache hash table entries: 65536 (order: 7, 524288 bytes)
> > TCP established hash table entries: 262144 (order: 10, 4194304 bytes)
> > TCP bind hash table entries: 65536 (order: 8, 1048576 bytes)
> > TCP: Hash tables configured (established 262144 bind 65536)
> > TCP reno registered
> > NET: Registered protocol family 1
> > checking if image is initramfs... it is
> > Freeing initrd memory: 2331k freed
> > IOMMU table initialized, virtual merging enabled
> > audit: initializing netlink socket (disabled)
> > type=2000 audit(1222908206.468:1): initialized
> > HugeTLB registered 16 MB page size, pre-allocated 0 pages
> > HugeTLB registered 16 GB page size, pre-allocated 0 pages
> > HugeTLB registered 64 KB page size, pre-allocated 0 pages
> > Installing knfsd (copyright (C) 1996 okir@xxxxxxxxxxxx).
> > msgmni has been set to 3985
> > Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254)
> > io scheduler noop registered
> > io scheduler anticipatory registered (default)
> > io scheduler deadline registered
> > io scheduler cfq registered
> > Generic RTC Driver v1.07
> > Serial: 8250/16550 driver4 ports, IRQ sharing disabled
> > brd: module loaded
> > loop: module loaded
> > Intel(R) PRO/1000 Network Driver - version 7.3.20-k3-NAPI
> > Copyright (c) 1999-2006 Intel Corporation.
> > pcnet32.c:v1.35 21.Apr.2008 tsbogend@xxxxxxxxxxxxxxxx
> > e100: Intel(R) PRO/100 Network Driver, 3.5.23-k4-NAPI
> > e100: Copyright(c) 1999-2006 Intel Corporation
> > console [netcon0] enabled
> > netconsole: network logging started
> > Uniform Multi-Platform E-IDE driver
> > ipr: IBM Power RAID SCSI Device Driver version: 2.4.1 (April 24, 2007)
> > ibmvscsi 30000003: SRP_VERSION: 16.a
> > scsi0 : IBM POWER Virtual SCSI Adapter 1.5.8
> > ibmvscsi 30000003: partner initialization complete
> > ibmvscsi 30000003: sent SRP login
> > ibmvscsi 30000003: SRP_LOGIN succeeded
> > ibmvscsi 30000003: host srp version: 16.a, host partition tundro1 (1),
> > OS 2, max io 262144
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi 0:0:1:0: Direct-Access IBM VDASD blkdev 0001 PQ: 0
> > ANSI: 4
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
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> > scsi scan: INQUIRY result too short (5), using 36
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> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > scsi scan: INQUIRY result too short (5), using 36
> > st: Version 20080504, fixed bufsize 32768, s/g segs 256
> > Driver 'st' needs updating - please use bus_type methods
> > Driver 'sd' needs updating - please use bus_type methods
> > sd 0:0:1:0: [sda] 73400922 512-byte hardware sectors (37581 MB)
> > sd 0:0:1:0: [sda] Write Protect is off
> > sd 0:0:1:0: [sda] Write cache: disabled, read cache: disabled, doesn't
> > support DPO or FUA
> > sd 0:0:1:0: [sda] 73400922 512-byte hardware sectors (37581 MB)
> > sd 0:0:1:0: [sda] Write Protect is off
> > sd 0:0:1:0: [sda] Write cache: disabled, read cache: disabled, doesn't
> > support DPO or FUA
> > sda: sda1 sda2 sda3 sda4 < sda5 sda6 sda7 >
> > sd 0:0:1:0: [sda] Attached SCSI disk
> > Driver 'sr' needs updating - please use bus_type methods
> > sd 0:0:1:0: Attached scsi generic sg0 type 0
> > Initializing USB Mass Storage driver...
> > usbcore: registered new interface driver usb-storage
> > USB Mass Storage support registered.
> > mice: PS/2 mouse device common for all mice
> > md: linear personality registered for level -1
> > md: raid0 personality registered for level 0
> > md: raid1 personality registered for level 1
> > device-mapper: ioctl: 4.14.0-ioctl (2008-04-23) initialised:
> > dm-devel@xxxxxxxxxx
> > usbcore: registered new interface driver hiddev
> > usbcore: registered new interface driver usbhid
> > usbhid: v2.6:USB HID core driver
> > IPv4 over IPv4 tunneling driver
> > TCP cubic registered
> > NET: Registered protocol family 17
> > RPC: Registered udp transport module.
> > RPC: Registered tcp transport module.
> > registered taskstats version 1
> > Freeing unused kernel memory: 292k freed
> > Red Hat nash version 5.1.19.6 starting
> > Mounting proc filesystem
> > Mounting sysfs filesystem
> > Creating /dev
> > Creating initial device nodes
> > Setting up hotplug.
> > Creating block device nodes.
> > Loading ehea.ko module
> > IBM eHEA ethernet device driver (Release EHEA_0092)
> > Scanning and configuring dmraid supported devices
> > Creating root device.
> > Mounting root filesystem.
> > kjournald starting. Commit interval 5 seconds
> > EXT3-fs: mounted filesystem with ordered data mode.
> > Setting up other filesystems.
> > Setting up new root fs
> > no fstab.sys, mounting internal defaults
> > Switching to new root and running init.
> > unmounting old /dev
> > unmounting old /proc
> > unmounting old /sys
> > INIT: version 2.86 booting
> > Welcome to Red Hat Enterprise Linux Server
> > Press 'I' to enter interactive startup.
> > RCU detected CPU 5 stall (t=1222922609/2)
> > Call Trace:
> > [c000000042d03920] [c00000000000fdec] .show_stack+0x70/0x184
> > (unreliable)
> > [c000000042d039d0] [c0000000000a1de0] .__rcu_pending+0x98/0x2ec
> > [c000000042d03a70] [c0000000000a206c] .rcu_pending+0x38/0x88
> > [c000000042d03af0] [c00000000006363c] .update_process_times+0x48/0x94
> > [c000000042d03b80] [c00000000007bae4] .tick_sched_timer+0xbc/0x118
> > [c000000042d03c20] [c000000000073a88] .__run_hrtimer+0x78/0x118
> > [c000000042d03cc0] [c000000000074b3c] .hrtimer_interrupt+0x128/0x1e4
> > [c000000042d03d90] [c00000000002304c] .timer_interrupt+0xe0/0x15c
> > [c000000042d03e30] [c000000000003700] decrementer_common+0x100/0x180
> > Setting clock (localtime): Thu Oct 2 00:43:30 EDT 2008 [ OK ]
> > Starting udev: [ OK ]
> > Setting hostname tundro2.rchland.ibm.com: [ OK ]
> > No devices found
> > Setting up Logical Volume Management: No volume groups found
> > [ OK ]
> > Checking filesystems
> > Checking all file systems.
> > [/sbin/fsck.ext3 (1) -- /] fsck.ext3 -a /dev/sda6
> > /dev/sda6: Superblock last mount time is in the future. FIXED.
> > /dev/sda6: clean, 134758/1281696 files, 853722/2560336 blocks
> > [ OK ]
> > Remounting root filesystem in read-write mode: [ OK ]
> > Mounting local filesystems: [ OK ]
> > Enabling local filesystem quotas: quotaon: Warning: No quota format
> > detected in the kernel.
> > [ OK ]
> > Enabling /etc/fstab swaps: swapon: /dev/sda5: Invalid argument
> > [FAILED]
> > INIT: Entering runlevel: 3
> > Entering non-interactive startup
> > Starting boot.loadmodules: [ OK ]
> > Starting background readahead: [ OK ]
> > Bringing up loopback interface: [ OK ]
> > Bringing up interface eth0: [ OK ]
> > Starting auditd: [ OK ]
> > Starting system logger: [ OK ]
> > Starting kernel logger: [ OK ]
> > Starting irqbalance: [ OK ]
> > Starting RPC idmapd: FATAL: Module sunrpc not found.
> > FATAL: Error running install command for sunrpc
> > Error: RPC MTAB does not exist.
> > Starting system message bus: [ OK ]
> > Starting Bluetooth services:[ OK ][ OK ]Can't open RFCOMM control
> > socket: Address family not supported by protocol
> >
> > Mounting other filesystems: [ OK ]
> > Starting PC/SC smart card daemon (pcscd): [ OK ]
> > Starting hidd: Can't open HIDP control socket: Address family not
> > supported by protocol
> > [FAILED]
> > Starting autofs: Loading autofs4: [ OK ]
> > Starting automount: [ OK ]
> > [ OK ]
> > Starting iprinit: Starting ipr initialization daemon[ OK ]
> > [ OK ]
> > Starting iprupdate: Checking ipr microcode levels
> > Completed ipr microcode updates[ OK ]
> > [ OK ]
> > Starting iprdump: Starting ipr dump daemon[ OK ]
> > [ OK ]
> > Starting sshd: [ OK ]
> > Starting cups: [ OK ]
> > Starting xinetd: [ OK ]
> > Starting vpdupdate: [ OK ]
> > Starting console mouse services: [ OK ]
> > Starting crond: [ OK ]
> > Starting xfs: [ OK ]
> > Starting anacron: [ OK ]
> > Starting atd: [ OK ]
> > Starting yum-updatesd: [ OK ]
> > Starting Avahi daemon... [ OK ]
> > Starting HAL daemon: [ OK ]
> > Starting smartd: [ OK ]
> >
> > Red Hat Enterprise Linux Server release 5.2 (Tikanga)
> > Kernel 2.6.27-rc7-autokern1 on an ppc64
> >
> > tundro2.rchland.ibm.com login:-- 0:conmux-control -- time-stamp --
> > Oct/01/08 21:45:47 --
> > -- 0:conmux-control -- time-stamp -- Oct/01/08 22:01:03 --
> > (bot:conmon-payload) disconnected
>
> --
> Mathieu Desnoyers
> OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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