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Re: [Xen-users] hi all..... probleme with clocksource

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] hi all..... probleme with clocksource
From: SZABO Zsolt <szazs@xxxxxxxxx>
Date: Wed, 12 Aug 2009 14:23:17 +0200 (CEST)
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On Wed, 12 Aug 2009, amina elbekkali wrote:

HI everybody, i wish you are all fine

I'm actually working in a project based on xen 3.2 wich was installed in
debian lenny 5.0

afeter being installed (the hypervisor); i created a first virtual machine
and  things were going verry well still i rebooted the dom0 (the host); afet
that; the virtual machine shell display this strange and unending messages:


5933.125364] clocksource/0: Time went backwards: ret=2ee31f49829
delta=-5892086159522 shadow=2ee2e490302 offset=3abce2e
[ 5933.125368] __ratelimit: 3750 messages suppressed

[...]

I have similar problem (xen 3.2.1 from debian lenny):
when rebooting, my_domU will be saved (by /etc/init.d/xendomains stop)
and after the reboot (/etc/init.d/xendomains start) the restored my_domU has this issue...

I tried manually "xm save my_domU ..." and "xm restore ..."
then only a few such lines were obtained:
[ 1317.621642] BUG: soft lockup - CPU#1 stuck for 245s! [swapper:0]
[ 1317.621642] Modules linked in: ipv6 reiserfs dm_mirror dm_log dm_snapshot 
dm_mod raid1 md_mod thermal_sys
[ 1317.621642] CPU 1:
[ 1317.621642] Modules linked in: ipv6 reiserfs dm_mirror dm_log dm_snapshot 
dm_mod raid1 md_mod thermal_sys
[ 1317.621642] Pid: 0, comm: swapper Not tainted 2.6.26-2-xen-amd64 #1
[ 1317.621642] RIP: e030:[<ffffffff802083aa>]  [<ffffffff802083aa>]
[ 1317.621642] RSP: e02b:ffff88017fc67f08  EFLAGS: 00000246
[ 1317.621642] RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff802083aa
[ 1317.621642] RDX: ffff88017fc67f20 RSI: 0000000000000000 RDI: 0000000000000001
[ 1317.621642] RBP: 0000000000000000 R08: 0000000000000000 R09: ffff880001bc15b8
[ 1317.621642] R10: ffff880081639000 R11: 0000000000000246 R12: 0000000000000000
[ 1317.621642] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 1317.621642] FS:  00007fae6c1686e0(0000) GS:ffffffff80539080(0000) 
knlGS:0000000000000000
[ 1317.621642] CS:  e033 DS: 002b ES: 002b
[ 1317.621642] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1317.621642] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1317.621642]
[ 1317.621642] Call Trace:
[ 1317.621642]  [<ffffffff80261217>] rcu_pending+0x26/0x50
[ 1317.621642]  [<ffffffff8020e795>] xen_safe_halt+0x90/0xa6
[ 1317.621642]  [<ffffffff8020a0c8>] xen_idle+0x2e/0x66
[ 1317.621642]  [<ffffffff80209cd6>] cpu_idle+0x97/0xb9
[ 1317.621642]
[ 1317.626161] BUG: soft lockup - CPU#0 stuck for 245s! [swapper:0]
[ 1317.626161] Modules linked in: ipv6 reiserfs dm_mirror dm_log dm_snapshot 
dm_mod raid1 md_mod thermal_sys
[ 1317.626161] CPU 0:
[ 1317.626161] Modules linked in: ipv6 reiserfs dm_mirror dm_log dm_snapshot 
dm_mod raid1 md_mod thermal_sys
[...]

but the domU seems to be OK.

--
Zsolt

# xm vcpu-list
Name ID VCPU CPU State Time(s) CPU Affinity
Domain-0                             0     0     0   r--    2319.1 0
Domain-0                             0     1     -   --p      13.1 1
Domain-0                             0     2     -   --p      11.9 2
Domain-0                             0     3     -   --p      10.1 3
Domain-0                             0     4     -   --p      10.8 4
Domain-0                             0     5     -   --p      14.7 5
Domain-0                             0     6     -   --p      14.6 6
Domain-0                             0     7     -   --p      14.1 7
my_domU                             14     0     3   -b-      17.5 1-4
my_domU                             14     1     1   -b-       6.0 1-4
my_domU                             14     2     2   -b-       5.1 1-4
my_domU                             14     3     4   -b-       4.7 1-4

# xm dmesg
(XEN) Xen version 3.2-1 (Debian 3.2.1-2) (waldi@xxxxxxxxxx) (gcc version
4.3.1 (Debian 4.3.1-2) ) Sat Jun 28 09:32:18 UTC 2008
(XEN) Command line: console=vga dom0_mem=512M cpufreq=dom0-kernel acpi=on 
numa=on
(XEN) Video information:
(XEN)  VGA is text mode 80x25, font 8x16
(XEN)  VBE/DDC methods: none; EDID transfer time: 0 seconds
(XEN)  EDID info not retrieved because no DDC retrieval method detected
(XEN) Disc information:
(XEN)  Found 6 MBR signatures
(XEN)  Found 6 EDD information structures
(XEN) Xen-e820 RAM map:
(XEN)  0000000000000000 - 000000000009b000 (usable)
(XEN)  000000000009b000 - 00000000000a0000 (reserved)
(XEN)  00000000000d2000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 000000007ff90000 (usable)
(XEN)  000000007ff90000 - 000000007ff97000 (ACPI data)
(XEN)  000000007ff97000 - 0000000080000000 (ACPI NVS)
(XEN)  0000000080000000 - 00000000d1f00000 (usable)
(XEN)  00000000d1f00000 - 00000000d2000000 (reserved)
(XEN)  00000000e0000000 - 00000000f0000000 (reserved)
(XEN)  00000000fec00000 - 00000000fec10000 (reserved)
(XEN)  00000000fee00000 - 00000000fee01000 (reserved)
(XEN)  00000000fff80000 - 0000000100000000 (reserved)
(XEN)  0000000100000000 - 000000042e000000 (usable)
(XEN) System RAM: 16382MB (16775340kB)
(XEN) Xen heap: 14MB (14540kB)
(XEN) Reserving non-aligned node boundary @ mfn 1236992
(XEN) Reserving non-aligned node boundary @ mfn 2285568
(XEN) Reserving non-aligned node boundary @ mfn 3334144
(XEN) Domain heap initialised: DMA width 32 bits
(XEN) Processor #0 15:1 APIC version 16
(XEN) Processor #1 15:1 APIC version 16
(XEN) Processor #2 15:1 APIC version 16
(XEN) Processor #3 15:1 APIC version 16
(XEN) Processor #4 15:1 APIC version 16
(XEN) Processor #5 15:1 APIC version 16
(XEN) Processor #6 15:1 APIC version 16
(XEN) Processor #7 15:1 APIC version 16
(XEN) IOAPIC[0]: apic_id 8, version 17, address 0xfec00000, GSI 0-23
(XEN) Enabling APIC mode:  Flat.  Using 1 I/O APICs
(XEN) Using scheduler: SMP Credit Scheduler (credit)
(XEN) Detected 2813.014 MHz processor.
(XEN) AMD SVM: ASIDs disabled.
(XEN) HVM: SVM enabled
(XEN) CPU0: AMD Dual-Core AMD Opteron(tm) Processor 8220 stepping 03
(XEN) Booting processor 1/1 eip 8c000
(XEN) AMD: Disabling C1 Clock Ramping Node #0
(XEN) AMD: Disabling C1 Clock Ramping Node #1
(XEN) AMD: Disabling C1 Clock Ramping Node #2
(XEN) AMD: Disabling C1 Clock Ramping Node #3
(XEN) AMD SVM: ASIDs disabled.
(XEN) CPU1: AMD Dual-Core AMD Opteron(tm) Processor 8220 stepping 03
(XEN) Booting processor 2/2 eip 8c000
(XEN) AMD SVM: ASIDs disabled.
(XEN) CPU2: AMD Dual-Core AMD Opteron(tm) Processor 8220 stepping 03
(XEN) Booting processor 3/3 eip 8c000
(XEN) AMD SVM: ASIDs disabled.
(XEN) CPU3: AMD Dual-Core AMD Opteron(tm) Processor 8220 stepping 03
(XEN) Booting processor 4/4 eip 8c000
(XEN) AMD SVM: ASIDs disabled.
(XEN) CPU4: AMD Dual-Core AMD Opteron(tm) Processor 8220 stepping 03
(XEN) Booting processor 5/5 eip 8c000
(XEN) AMD SVM: ASIDs disabled.
(XEN) CPU5: AMD Dual-Core AMD Opteron(tm) Processor 8220 stepping 03
(XEN) Booting processor 6/6 eip 8c000
(XEN) AMD SVM: ASIDs disabled.
(XEN) CPU6: AMD Dual-Core AMD Opteron(tm) Processor 8220 stepping 03
(XEN) Booting processor 7/7 eip 8c000
(XEN) AMD SVM: ASIDs disabled.
(XEN) CPU7: AMD Dual-Core AMD Opteron(tm) Processor 8220 stepping 03
(XEN) Total of 8 processors activated.
(XEN) ENABLING IO-APIC IRQs
(XEN)  -> Using new ACK method
(XEN) Platform timer overflows in 234 jiffies.
(XEN) Platform timer is 3.579MHz ACPI PM Timer
(XEN) Brought up 8 CPUs
(XEN) AMD IOMMU: Disabled
(XEN) *** LOADING DOMAIN 0 ***
(XEN)  Xen  kernel: 64-bit, lsb, compat32
(XEN)  Dom0 kernel: 64-bit, lsb, paddr 0x200000 -> 0x631918
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN)  Dom0 alloc.:   0000000128000000->000000012a000000 (122880 pages to be 
allocated)
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN)  Loaded kernel: ffffffff80200000->ffffffff80631918
(XEN)  Init. ramdisk: ffffffff80632000->ffffffff81bb6000
(XEN)  Phys-Mach map: ffffffff81bb6000->ffffffff81cb6000
(XEN)  Start info:    ffffffff81cb6000->ffffffff81cb64a4
(XEN)  Page tables:   ffffffff81cb7000->ffffffff81cca000
(XEN)  Boot stack:    ffffffff81cca000->ffffffff81ccb000
(XEN)  TOTAL:         ffffffff80000000->ffffffff82000000
(XEN)  ENTRY ADDRESS: ffffffff80200000
(XEN) Dom0 has maximum 8 VCPUs
(XEN) Initrd len 0x1584000, start at 0xffffffff80632000
(XEN) Scrubbing Free RAM:
......................................................
................................................................................
......................done.
(XEN) Xen trace buffers: disabled
(XEN) Std. Loglevel: Errors and warnings
(XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings)
(XEN) Xen is relinquishing VGA console.
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to Xe$
(XEN) Freed 104kB init memory.


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