[Xen-devel] Re: xenpm fail

[Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>]

Thanks for the report. I can't reproduce on first attempt but I will
take a look.

On Fri, 2010-10-29 at 09:32 +0100, Zhang, Yang Z wrote:
> Hi ian
> I find Cs 22292 cause xenpm broken. 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.
> If remove the patch 22292, everything is ok.
> 
> best regards
> yang
> 
> 



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