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Message-ID: <20081002140507.GB6729@linux.vnet.ibm.com>
Date: Thu, 2 Oct 2008 07:05:07 -0700
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: Ingo Molnar <mingo@...e.hu>
Cc: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
mathieu.desnoyers@...ymtl.ca, laijs@...fujitsu.com,
manfred@...orfullife.com, dipankar@...ibm.com, niv@...ibm.com,
dvhltc@...ibm.com, josht@...ux.vnet.ibm.com
Subject: Re: [PATCH,RFC] RCU-based detection of stalled CPUs for Classic RCU
On Thu, Oct 02, 2008 at 10:07:26AM +0200, Ingo Molnar wrote:
>
> * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> 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?
> > (Currently against 2.6.27-rc8, FYI.)
> >
> > Thoughts?
> >
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
>
> 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@...00000
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@...00000
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@...dro2.rchland.ibm.com) (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@...ad.swb.de).
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@...ha.franken.de
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
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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
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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
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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
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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
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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
scsi scan: INQUIRY result too short (5), using 36
scsi scan: INQUIRY result too short (5), using 36
scsi scan: INQUIRY result too short (5), using 36
scsi scan: INQUIRY result too short (5), using 36
scsi scan: INQUIRY result too short (5), using 36
scsi scan: INQUIRY 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
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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
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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
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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@...hat.com
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
--
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