[Xen-bugs] [Bug 1677] New: run xenpm get segment fault

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1677

           Summary: run xenpm get segment fault
           Product: Xen
           Version: unstable
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Tools
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: yang.z.zhang@xxxxxxxxx


Environment:
------------
Service Arch (ia32/ia32e/IA64): ia32/ia32e
Guest Arch (ia32/ia32e/IA64): ia32/ia32e
Guest OS Type (Linux/Windows):Linux
Change Set: 22314
Hardware:  westmere-ep
Other:
xen-changeset:   22314:28a160746815
xen-date:        Wed Oct 27 12:24:28 2010 +0100

pvops git:
commit d0054d672ff0ebf6116cee27bae3fc2591c726af
Author: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
Date:   Mon Oct 25 16:53:46 2010 -0700


ioemu git:
commit 1a13c2df0c5c93f06c0f2286628b9b0f4d80ff4d
Author: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Date:   Thu Oct 21 17:59:20 2010 +0100


Bug detailed description:
--------------------------
Xenpm is broken now. When run "xenpm start" or "xenpm get-cpuidle-states" and
other xenmpm command, it will get segment fault. 
After do some investigation, I find call xc_pm_get_cxstat() will free the
cxstat->tiggers, For example:
Here is some code form my test.c.

struct xc_cx_stat cxstatinfo, *cxstat = &cxstatinfo;

cxstat->triggers = malloc(max_cx_num * sizeof(uint64_t));

if ( !cxstat->triggers ) {
    printf("get memory fail");
    return NOMEM;
}
ret = xc_pm_get_cxstat(xc_handle, cpu, cxstat); printf("triggers=%lx \n",
cxstat->triggers[0]);

Run it, and it will show segment fault at print the cxtat->tiggers[0]. It seems
that xc_pm_get_cxstat() will free cxstat->triggers which we allocate memory
before, and then when try to touch cxstat->tiggers[0], the issue raised.
And this issue was introduced by cs 22292. If remove the patch 22292,
everything is ok.



Reproduce steps:
----------------
1.Install xen (cs > 22292)
2.run xenpm start to star collect data
3.using ctrl-c to stop it and see the data
4.then it is killed by segment fault

Current result:
----------------
segment fault

Expected result:
----------------
can see the pm info


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