Re: question about SIGSEGV in datacopier_readable in libxl_aoutil.c

[Andrew Cooper <andrew.cooper3@citrix.com>]

On 03/09/13 08:56, Ian Campbell wrote:
> On Tue, 2013-09-03 at 15:01 +0800, Chunyan Liu wrote:
>> Hi, List,
> Adding Ian J, who knows this bit of the code.
>
> Which version of Xen (and therefore libxl) are you using?
>
>> I'm trying to add migration APIs to libvirt libxl driver. In testing
>> HVM migration, on source side, when executing libxl_domain_suspend,
>> often meet SIGSEGV in libxl_aoutil.c: datacopier_readable, the
>> malloc() function place:
>>       if (!buf || buf->used >= sizeof(buf->buf)) {
>>             buf = malloc(sizeof(*buf));
>>
>> I doubt the heap is corrupted someway but couldn't confirm the root
>> cause. And I tried valgrind to find some clue, following is the info
>> right before the SIGSEGV.
>> #valgrind --leak-check=full /usr/sbin/libvirtd -l -d
> Did you use a Xen aware version of valgrind?
> http://blog.xen.org/index.php/2013/01/18/using-valgrind-to-debug-xen-toolstacks/

In which case I really should post my valgrind patches for full
migration support.

I will try to get around to posting the series today.

~Andrew