[Xen-bugs] [Bug 1589] New: [RAS] System hang when online pcpu

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1589

           Summary: [RAS] System hang when online pcpu
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P1
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: jiajun.xu@xxxxxxxxx


Environment:
------------
Service Arch (ia32/ia32e/IA64): 
Guest Arch (ia32/ia32e/IA64): 
Guest OS Type (Linux/Windows):
Change Set: 21022:132ac04cbdba
pvops dom0: eb739cf358e03cd6ab69437d2429bcc8ad57d45b
ioemu:4ee8bdd513b4d7af0e14434f4c53887779a33eda
Hardware: NHM-EX
Other:


Bug detailed description:
--------------------------
when online pcpu throu dom0 interface /sys/device/system/cpu/xen_pcpu*, it
cause a system hang. this issue a new issue between changeset 21009 and 21022.


Reproduce steps:
----------------
1. physical offline a cpu socket before system booting up
2. boot xen
3. trigger the cpu jumper to enable the new socket
4. enable pcpu throu dom0 interface /sys/device/system/cpu/xen_pcpu*
[root@lkp-nex04 xen_pcpu]# 
for c in xen_pcpu*
> do
> echo 1 > $c/online
> done


Current result:
----------------


Expected result:
----------------


Basic root-causing log:
----------------------
[root@lkp-nex04 xen_pcpu]# for c in xen_pcpu*
> do
> echo 1 > $c/online
> done
(XEN) Booting processor 10/100 eip 88000
(XEN) Initializing CPU#10
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 18432K
(XEN) CPU: Physical Processor ID: 3
(XEN) CPU: Processor Core ID: 2
(XEN) HVM: ASIDs enabled.
(XEN) Intel machine check reporting enabled on CPU#10.
(XEN) CPU10: Thermal monitoring enabled (TM1)
(XEN) CPU10: Intel(R) Xeon(R) CPU           X7550  @ 2.00GHz stepping 06
(XEN) microcode.c:73:d32767 microcode: CPU10 resumed
(XEN) Booting processor 11/102 eip 88000
(XEN) Initializing CPU#11
(XEN) CPU: L1 I cache: 32K, L1 D cache: 32K
(XEN) CPU: L2 cache: 256K
(XEN) CPU: L3 cache: 18432K
(XEN) CPU: Physical Processor ID: 3
(XEN) CPU: Processor Core ID: 3
(XEN) HVM: ASIDs enabled.
(XEN) Intel machine check reporting enabled on CPU#11.
(XEN) CPU11: Thermal monitoring enabled (TM1)
(XEN) CPU11: Intel(R) Xeon(R) CPU           X7550  @ 2.00GHz stepping 06


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