Date:	Wed, 6 Jul 2011 11:12:02 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: [linux-next, rcu] smp_call_function_single triggers kernel warning
 in kernel/smp.c:320

Got a backtrace in kvm with a !NUMA (SMP) configuration of linux-next on
Sandybridge:

Decompressing Linux... Parsing ELF... done.
Booting the kernel.
Linux version 3.0.0-rc6-next-20110706-kvm-dirty (christoph@...dy) (gcc
version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4) ) #1 SMP Wed Jul 6 11:00:57
CDT 2011
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009f400 (usable)
 BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 000000003fffd000 (usable)
 BIOS-e820: 000000003fffd000 - 0000000040000000 (reserved)
 BIOS-e820: 00000000fffc0000 - 0000000100000000 (reserved)
bootconsole [earlyser0] enabled
Notice: NX (Execute Disable) protection cannot be enabled: non-PAE kernel!
DMI 2.4 present.
last_pfn = 0x3fffd max_arch_pfn = 0x100000
found SMP MP-table at [400fd760] fd760
init_memory_mapping: 0000000000000000-000000003fffd000
ACPI: RSDP 000fd710 00014 (v00 BOCHS )
ACPI: RSDT 3fffda70 00034 (v01 BOCHS  BXPCRSDT 00000001 BXPC 00000001)
ACPI: FACP 3ffffdf0 00074 (v01 BOCHS  BXPCFACP 00000001 BXPC 00000001)
ACPI: DSDT 3fffddc0 01FB7 (v01   BXPC   BXDSDT 00000001 INTL 20090123)
ACPI: FACS 3ffffd80 00040
ACPI: SSDT 3fffdbf0 001C1 (v01 BOCHS  BXPCSSDT 00000001 BXPC 00000001)
ACPI: APIC 3fffdaf0 0008A (v01 BOCHS  BXPCAPIC 00000001 BXPC 00000001)
ACPI: HPET 3fffdab0 00038 (v01 BOCHS  BXPCHPET 00000001 BXPC 00000001)
1023MB LOWMEM available.
  mapped low ram: 0 - 3fffd000
  low ram: 0 - 3fffd000
Zone PFN ranges:
  DMA      0x00000010 -> 0x00001000
  Normal   0x00001000 -> 0x0003fffd
Movable zone start PFN for each node
early_node_map[2] active PFN ranges
    0: 0x00000010 -> 0x0000009f
    0: 0x00000100 -> 0x0003fffd
Using APIC driver default
ACPI: PM-Timer IO Port: 0xb008
ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] enabled)
ACPI: LAPIC (acpi_id[0x03] lapic_id[0x03] enabled)
ACPI: IOAPIC (id[0x04] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 4, version 17, address 0xfec00000, GSI 0-23
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
Using ACPI (MADT) for SMP configuration information
ACPI: HPET id: 0x8086a201 base: 0xfed00000
SMP: Allowing 4 CPUs, 0 hotplug CPUs
Allocating PCI resources starting at 40000000 (gap: 40000000:bffc0000)
setup_percpu: NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:4 nr_node_ids:1
PERCPU: Embedded 11 pages/cpu @7f000000 s23488 r0 d21568 u1048576
Built 1 zonelists in Zone order, mobility grouping on.  Total pages:
259980
Kernel command line: root=/dev/hda1 earlyprintk=ttyS0,115200
console=ttyS0,115200
PID hash table entries: 4096 (order: 2, 16384 bytes)
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Initializing CPU#0
Memory: 1032388k/1048564k available (3859k kernel code, 15724k reserved,
1794k data, 352k init, 0k highmem)
virtual kernel memory layout:
    fixmap  : 0xfff17000 - 0xfffff000   ( 928 kB)
    vmalloc : 0x807fd000 - 0xfff15000   (2039 MB)
    lowmem  : 0x40000000 - 0x7fffd000   (1023 MB)
      .init : 0x40686000 - 0x406de000   ( 352 kB)
      .data : 0x404c4e1f - 0x40685980   (1794 kB)
      .text : 0x40100000 - 0x404c4e1f   (3859 kB)
Checking if this processor honours the WP bit even in supervisor
mode...Ok.
SLUB: Genslabs=15, HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
Hierarchical RCU implementation.
NR_IRQS:512
Console: colour VGA+ 80x25
console [ttyS0] enabled, bootconsole disabled
console [ttyS0] enabled, bootconsole disabled
Fast TSC calibration using PIT
Detected 3491.312 MHz processor.
Marking TSC unstable due to TSCs unsynchronized
Calibrating delay loop (skipped), value calculated using timer frequency..
6982.62 BogoMIPS (lpj=3491312)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
ACPI: Core revision 20110413
Enabling APIC mode:  Flat.  Using 1 I/O APICs
..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
CPU0: AMD QEMU Virtual CPU version 0.14.0 stepping 03
Performance Events: Broken PMU hardware detected, using software events
only.
Booting Node   0, Processors  #1
Initializing CPU#1
------------[ cut here ]------------
WARNING: at arch/x86/kernel/cpu/amd.c:187 init_amd+0x2ac/0x495()
Hardware name: Bochs
WARNING: This combination of AMD processors is not suitable for SMP.
Modules linked in:
Pid: 0, comm: kworker/0:0 Not tainted 3.0.0-rc6-next-20110706-kvm-dirty #1
Call Trace:
 [<4012694e>] warn_slowpath_common+0x65/0x7a
 [<404bc3f5>] ? init_amd+0x2ac/0x495
 [<401269c7>] warn_slowpath_fmt+0x26/0x2a
 [<404bc3f5>] init_amd+0x2ac/0x495
 [<404bb4f6>] ? get_cpu_cap+0xb7/0xbc
 [<404bb6bc>] identify_cpu+0x1c1/0x2d4
 [<404bb7e0>] identify_secondary_cpu+0x11/0x18
 [<404bde75>] smp_store_cpu_info+0x31/0x35
 [<404be197>] start_secondary+0xd5/0x1e3
---[ end trace a7919e7f17c0a725 ]---
Disabling lock debugging due to kernel taint
mce: CPU supports 10 MCE banks
 #2
Initializing CPU#2
 #3 Ok.
Initializing CPU#3
Brought up 4 CPUs
Total of 4 processors activated (28516.12 BogoMIPS).
xor: automatically using best checksumming function: pIII_sse
   pIII_sse  :  1124.000 MB/sec
xor: using function: pIII_sse (1124.000 MB/sec)
NET: Registered protocol family 16
ACPI: bus type pci registered
PCI: PCI BIOS revision 2.10 entry at 0xfc566, last bus=0
PCI: Using configuration type 1 for base access
bio: create slab <bio-0> at 0
raid6: int32x1    191 MB/s
raid6: int32x2    140 MB/s
raid6: int32x4    148 MB/s
raid6: int32x8     97 MB/s
raid6: mmxx1      191 MB/s
raid6: mmxx2      203 MB/s
raid6: sse1x1     203 MB/s
raid6: sse1x2     199 MB/s
raid6: sse2x1     398 MB/s
raid6: sse2x2     378 MB/s
raid6: using algorithm sse2x1 (398 MB/s)
ACPI: Interpreter enabled
ACPI: (supports S0 S3 S5)
ACPI: Using IOAPIC for interrupt routing
ACPI: No dock devices found.
PCI: Ignoring host bridge windows from ACPI; if necessary, use
"pci=use_crs" and report a bug
ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
pci 0000:00:01.3: quirk: [io  0xb000-0xb03f] claimed by PIIX4 ACPI
pci 0000:00:01.3: quirk: [io  0xb100-0xb10f] claimed by PIIX4 SMB
 pci0000:00: Unable to request _OSC control (_OSC support mask: 0x18)
ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11)
ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11)
ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11)
ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11)
ACPI: PCI Interrupt Link [LNKS] (IRQs 9) *0
vgaarb: device added:
PCI:0000:00:02.0,decodes=io+mem,owns=io+mem,locks=none
vgaarb: loaded
vgaarb: bridge control possible 0000:00:02.0
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
PCI: Using ACPI for IRQ routing
HPET: 3 timers in total, 0 timers will be used for per-cpu timer
hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0
hpet0: 3 comparators, 64-bit 100.000000 MHz counter
Switching to clocksource hpet
Switched to NOHz mode on CPU #1
Switched to NOHz mode on CPU #2
Switched to NOHz mode on CPU #3
Switched to NOHz mode on CPU #0
pnp: PnP ACPI init
ACPI: bus type pnp registered
pnp: PnP ACPI: found 8 devices
ACPI: ACPI bus type pnp unregistered
NET: Registered protocol family 2
IP route cache hash table entries: 32768 (order: 5, 131072 bytes)
TCP established hash table entries: 131072 (order: 8, 1048576 bytes)
TCP bind hash table entries: 65536 (order: 8, 1310720 bytes)
TCP: Hash tables configured (established 131072 bind 65536)
TCP reno registered
UDP hash table entries: 512 (order: 2, 24576 bytes)
UDP-Lite hash table entries: 512 (order: 2, 24576 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
pci 0000:00:00.0: Limiting direct PCI/PCI transfers
pci 0000:00:01.0: PIIX3: Enabling Passive Release
pci 0000:00:01.0: Activating ISA DMA hang workarounds
HugeTLB registered 4 MB page size, pre-allocated 0 pages
VFS: Disk quotas dquot_6.5.2
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
Installing knfsd (copyright (C) 1996 okir@...ad.swb.de).
SGI XFS with ACLs, security attributes, realtime, large block/inode
numbers, no debug enabled
SGI XFS Quota Management subsystem
msgmni has been set to 2016
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253)
io scheduler noop registered
io scheduler deadline registered (default)
io scheduler cfq registered
start plist test
end plist test
input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
ACPI: Power Button [PWRF]
Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
00:06: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
Linux agpgart interface v0.103
Hangcheck: starting hangcheck timer 0.9.1 (tick is 180 seconds, margin is
60 seconds).
Hangcheck: Using getrawmonotonic().
FDC 0 is a S82078B
brd: module loaded
loop: module loaded
Uniform Multi-Platform E-IDE driver
piix 0000:00:01.1: IDE controller (0x8086:0x7010 rev 0x00)
piix 0000:00:01.1: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0xc000-0xc007
    ide1: BM-DMA at 0xc008-0xc00f
hda: QEMU HARDDISK, ATA DISK drive
hda: MWDMA2 mode selected
hdc: QEMU DVD-ROM, ATAPI CD/DVD-ROM drive
hdc: MWDMA2 mode selected
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
ide_generic: please use "probe_mask=0x3f" module parameter for probing all
legacy ISA IDE ports
ide-gd driver 1.18
hda: max request size: 512KiB
hda: 2047248 sectors (1048 MB) w/256KiB Cache, CHS=2031/255/63
hda: cache flushes supported
 hda: hda1
ide-cd driver 5.00
ide-cd: hdc: ATAPI 4X CD-ROM drive, 512kB Cache
cdrom: Uniform CD-ROM driver Revision: 3.20
Adaptec aacraid driver 1.1-7[28000]-ms
8139cp: 8139cp: 10/100 PCI Ethernet driver v1.3 (Mar 22, 2004)
ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 11
8139cp 0000:00:03.0: PCI INT A -> Link[LNKC] -> GSI 11 (level, high) ->
IRQ 11
8139cp 0000:00:03.0: eth0: RTL-8139C+ at 0x80814000, 52:54:00:12:34:56,
IRQ 11
console [netcon0] enabled
netconsole: network logging started
Fusion MPT base driver 3.04.19
Copyright (c) 1999-2008 LSI Corporation
Fusion MPT FC Host driver 3.04.19
Fusion MPT SAS Host driver 3.04.19
Fusion MPT misc device (ioctl) driver 3.04.19
mptctl: Registered with Fusion MPT base driver
mptctl: /dev/mptctl @ (major,minor=10,220)
usbcore: registered new interface driver usblp
i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq
1,12
serio: i8042 KBD port at 0x60,0x64 irq 1
serio: i8042 AUX port at 0x60,0x64 irq 12
mousedev: PS/2 mouse device common for all mice
input: AT Translated Set 2 keyboard as
/devices/platform/i8042/serio0/input/input1
rtc_cmos 00:01: rtc core: registered rtc_cmos as rtc0
rtc0: alarms up to one day, 114 bytes nvram, hpet irqs
rtc-test rtc-test.0: rtc core: registered test as rtc1
rtc-test rtc-test.1: rtc core: registered test as rtc2
md: linear personality registered for level -1
md: raid0 personality registered for level 0
md: raid1 personality registered for level 1
md: raid10 personality registered for level 10
md: raid6 personality registered for level 6
md: raid5 personality registered for level 5
md: raid4 personality registered for level 4
md: multipath personality registered for level -4
md: faulty personality registered for level -5
device-mapper: ioctl: 4.20.0-ioctl (2011-02-02) initialised:
dm-devel@...hat.com
cpuidle: using governor ladder
cpuidle: using governor menu
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
TCP cubic registered
NET: Registered protocol family 17
RPC: Registered rdma transport module.
NET: Registered protocol family 33
Registering the dns_resolver key type
Using IPI No-Shortcut mode
kAFS: Red Hat AFS client v0.1 registering.







input: ImExPS/2 Generic Explorer Mouse as
/devices/platform/i8042/serio1/input/input2
md: Waiting for all devices to be available before autodetect
md: If you don't use raid, use raid=noautodetect
md: Autodetecting RAID arrays.
md: Scanned 0 and added 0 devices.
md: autorun ...
md: ... autorun DONE.
VFS: Mounted root (ext2 filesystem) readonly on device 3:1.
Freeing unused kernel memory: 352k freed
Write protecting the kernel text: 3860k
Write protecting the kernel read-only data: 1504k
modprobe: FATAL: Could not load
/lib/modules/3.0.0-rc6-next-20110706-kvm-dirty/modules.dep: No such file
or directory

INIT: version 2.86 booting
Setting the system clock.
Activating swap...done.
Checking root file system...fsck 1.41.3 (12-Oct-2008)
/lib/init/rw/rootdev: clean, 9054/64000 files, 235871/255898 blocks
done.
Setting the system clock.
Cleaning up ifupdown....
Loading kernel modules...done.
Checking file systems...fsck 1.41.3 (12-Oct-2008)
done.
Setting kernel variables (/etc/sysctl.conf)...done.
Mounting local filesystems...done.
Activating swapfile swap...done.
Setting up networking....
Configuring network interfaces...Internet Systems Consortium DHCP Client
V3.1.1
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

8139cp 0000:00:03.0: eth0: link up, 100Mbps, full-duplex, lpa 0x05E1
Listening on LPF/eth0/52:54:00:12:34:56
Sending on   LPF/eth0/52:54:00:12:34:56
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7
DHCPOFFER from 10.0.2.2
DHCPREQUEST on eth0 to 255.255.255.255 port 67
DHCPACK from 10.0.2.2
------------[ cut here ]------------
WARNING: at kernel/smp.c:320 smp_call_function_single+0x59/0xc7()
Hardware name: Bochs
Modules linked in:
Pid: 1446, comm: ifconfig Tainted: G S      W
3.0.0-rc6-next-20110706-kvm-dirty #1
Call Trace:
 [<4012694e>] warn_slowpath_common+0x65/0x7a
 [<4014a1e7>] ? smp_call_function_single+0x59/0xc7
 [<40153de7>] ? invoke_rcu_core+0xf/0xf
 [<40126972>] warn_slowpath_null+0xf/0x13
 [<4014a1e7>] smp_call_function_single+0x59/0xc7
 [<40154070>] rcu_start_gp+0x13e/0x21a
 [<401549ee>] __rcu_process_callbacks+0xd5/0x224
 [<4012ee1b>] ? run_timer_softirq+0x1a0/0x1a8
 [<40154b6c>] rcu_process_callbacks+0x2f/0x31
 [<4012abe2>] __do_softirq+0x6b/0xe3
 [<4012ab77>] ? local_bh_enable+0x6e/0x6e
 <IRQ>  [<4012adb2>] ? irq_exit+0x35/0x70
 [<40112c29>] ? smp_apic_timer_interrupt+0x6c/0x7a
 [<404c3a39>] ? apic_timer_interrupt+0x31/0x38
 [<4044bb68>] ? rt_do_flush.clone.42+0x98/0xab
 [<4044c0d2>] ? rt_cache_flush+0x28/0x2b
 [<404735e6>] ? fib_disable_ip+0x23/0x2e
 [<40474030>] ? fib_inetaddr_event+0x4f/0x67
 [<4013d5ad>] ? notifier_call_chain+0x26/0x48
 [<4013d768>] ? __blocking_notifier_call_chain+0x34/0x48
 [<4013d788>] ? blocking_notifier_call_chain+0xc/0xe
 [<4046d75a>] ? __inet_del_ifa+0x152/0x1d7
 [<4046d7eb>] ? inet_del_ifa+0xc/0x10
 [<4046e9ee>] ? devinet_ioctl+0x4c2/0x53e
 [<4046f5cf>] ? inet_ioctl+0x8e/0xa7
 [<40428a01>] ? sock_ioctl+0x1a8/0x1cc
 [<40428859>] ? sock_fasync+0x6a/0x6a
 [<40191e49>] ? do_vfs_ioctl+0x447/0x478
 [<401185e0>] ? do_page_fault+0x2d3/0x303
 [<4013cb49>] ? hrtimer_interrupt+0x12e/0x1c7
 [<40191ea8>] ? sys_ioctl+0x2e/0x4a
 [<404c3604>] ? syscall_call+0x7/0xb
---[ end trace a7919e7f17c0a727 ]---
bound to 10.0.2.15 -- renewal in 34486 seconds.
done.
INIT: Entering runlevel: 2
Starting enhanced syslogd: rsyslogd.
Starting OpenBSD Secure Shell server: sshdsshd (1557): /proc/1557/oom_adj
is deprecated, please use /proc/1557/oom_score_adj instead.
.

Debian GNU/Linux squeeze/sid qmdr ttyS0

qmdr login:

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