FWIW: I tried just printing out the contents of that root object immediately
after importing the xml, and it clearly has a problem:
(gdb) print *obj
$2 = {type = OPAL_HWLOC122_hwloc_OBJ_SYSTEM, os_index = 0, name = 0x101
<Address 0x101 out of bounds>, memory = {
total_memory = 46912502995240, local_memory = 46912502995240,
page_types_len = 0, page_types = 0x0}, attr = 0x2,
depth = 6900112, logical_index = 0, os_level = 6571424, next_cousin = 0x0,
prev_cousin = 0xffffffff, parent = 0x0,
sibling_rank = 0, next_sibling = 0x0, prev_sibling = 0x0, arity = 145,
children = 0x2aaaab139738,
first_child = 0x2aaaab139738, last_child = 0x0, userdata = 0x0, cpuset = 0x0,
complete_cpuset = 0x0,
online_cpuset = 0x644700, allowed_cpuset = 0x691970, nodeset = 0x6919e0,
complete_nodeset = 0x644c90,
allowed_nodeset = 0x644cb0, distances = 0x6948b0, distances_count = 6900000,
infos = 0x0, infos_count = 0}
On Sep 24, 2011, at 9:02 AM, Ralph Castain wrote:
> Here's the trace:
>
> #0 0x00002aaaaae61737 in hwloc__xml_export_object (output=0x7fffffffd890,
> topology=0x695f10, obj=0x2aaaab139b28)
> at topology-xml.c:1094
> #1 0x00002aaaaae61b69 in hwloc___nolibxml_prepare_export (topology=0x695f10,
> xmlbuffer=0x698a70 "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<!DOCTYPE
> topology SYSTEM \"hwloc.dtd\">\n<topology>\n <object type=\"Unknown\"
> os_level=\"-1424778408\" os_index=\"10922\" cpuset=\"0xf...f\"
> complete_cpuset=\"0xf...f\" onl"...,
> buflen=16384) at topology-xml.c:1193
> #2 0x00002aaaaae61be0 in hwloc__nolibxml_prepare_export (topology=0x695f10,
> bufferp=0x7fffffffd988, buflenp=0x7fffffffd97c)
> at topology-xml.c:1207
> #3 0x00002aaaaae61d02 in opal_hwloc122_hwloc_topology_export_xmlbuffer
> (topology=0x695f10, xmlbuffer=0x7fffffffd988,
> buflen=0x7fffffffd97c) at topology-xml.c:1281
> #4 0x00002aaaaae529f4 in opal_hwloc_compare (topo1=0x695f10, topo2=0x6915c0,
> type=22 '\026') at base/hwloc_base_dt.c:183
> #5 0x00002aaaaadf348c in opal_dss_compare (value1=0x695f10, value2=0x6915c0,
> type=22 '\026') at dss/dss_compare.c:39
> #6 0x00002aaaaad9b5f7 in process_orted_launch_report (fd=-1, event=1,
> data=0x6444d0) at base/plm_base_launch_support.c:564
> #7 0x00002aaaaae3881f in event_process_active_single_queue (base=0x60dd60,
> activeq=0x6111e0) at event.c:1329
> #8 0x00002aaaaae38c71 in event_process_active (base=0x60dd60) at event.c:1396
> #9 0x00002aaaaae3902b in opal_libevent2012_event_base_loop (base=0x60dd60,
> flags=1) at event.c:1598
> #10 0x00002aaaaadf080d in opal_progress () at runtime/opal_progress.c:189
> #11 0x00002aaaaad9bbfa in orte_plm_base_daemon_callback (num_daemons=2) at
> base/plm_base_launch_support.c:666
> #12 0x00002aaaaada49e1 in plm_slurm_launch_job (jdata=0x67a500) at
> plm_slurm_module.c:404
> #13 0x0000000000403822 in orterun (argc=4, argv=0x7fffffffe1d8) at
> orterun.c:817
> #14 0x0000000000402aa3 in main (argc=4, argv=0x7fffffffe1d8) at main.c:13
>
> And the error report
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x00002aaaaae61737 in hwloc__xml_export_object (output=0x7fffffffd890,
> topology=0x695f10, obj=0x2aaaab139b28)
> at topology-xml.c:1094
> 1094 sprintf(tmp, "%llu", (unsigned long long)
> obj->memory.page_types[i].count);
> (gdb) print obj
> $1 = (opal_hwloc122_hwloc_obj_t) 0x2aaaab139b28
> (gdb) print *obj
> $2 = {type = 2870188824, os_index = 10922, name = 0x2aaaab139b18
> "\b\233\023\253\252*", memory = {total_memory = 6579376,
> local_memory = 6579376, page_types_len = 2870188856, page_types =
> 0x2aaaab139b38}, attr = 0x2aaaab139b48,
> depth = 2870188872, logical_index = 10922, os_level = -1424778408,
> next_cousin = 0x2aaaab139b58,
> prev_cousin = 0x2aaaab139b68, parent = 0x2aaaab139b68, sibling_rank =
> 2870188920, next_sibling = 0x2aaaab139b78,
> prev_sibling = 0x2aaaab139b88, arity = 2870188936, children =
> 0x2aaaab139b98, first_child = 0x2aaaab139b98,
> last_child = 0x2aaaab139ba8, userdata = 0x2aaaab139ba8, cpuset =
> 0x2aaaab139bb8, complete_cpuset = 0x2aaaab139bb8,
> online_cpuset = 0x2aaaab139bc8, allowed_cpuset = 0x2aaaab139bc8, nodeset =
> 0x2aaaab139bd8,
> complete_nodeset = 0x2aaaab139bd8, allowed_nodeset = 0x2aaaab139be8,
> distances = 0x2aaaab139be8,
> distances_count = 2870189048, infos = 0x2aaaab139bf8, infos_count =
> 2870189064}
> (gdb) print obj->memory
> $3 = {total_memory = 6579376, local_memory = 6579376, page_types_len =
> 2870188856, page_types = 0x2aaaab139b38}
> (gdb) print obj->memory.page_types
> $4 = (struct opal_hwloc122_hwloc_obj_memory_page_type_s *) 0x2aaaab139b38
> (gdb) print i
> $5 = 1612
> (gdb) print obj->memory.page_types[1600]
> $6 = {size = 0, count = 0}
> (gdb) print obj->memory.page_types[1612]
> Cannot access memory at address 0x2aaaab13fff8
> (gdb) print obj->memory.page_types[1611]
> $7 = {size = 0, count = 0}
> (gdb)
>
>
> The whole obj looks like trash to me. I looked a little more - the object
> referenced is the root object:
>
> 1193 hwloc__xml_export_object (&output, topology,
> hwloc_get_root_obj(topology));
>
> I'm continuing to look in case I'm doing something stupid, but the code is
> pretty linear here - unpack, import, export for compare.
>
>
> On Sep 24, 2011, at 8:59 AM, Jeff Squyres wrote:
>
>> Here's some feedback from Ralph -- any idea what's going wrong here?
>>
>> -----
>>
>> 1. I export a topology into xml using
>>
>> hwloc_topology_export_xmlbuffer(t, &xmlbuffer, &len);
>>
>> I then pack and send the string.
>>
>> 2. I unpack the string on the other end and import it into a topology
>> hwloc_topology_init(&t);
>> if (0 != (rc = hwloc_topology_set_xmlbuffer(t, xmlbuffer,
>> strlen(xmlbuffer)))) {
>> hwloc_topology_destroy(t);
>> goto cleanup;
>> }
>> hwloc_topology_load(t);
>>
>> 3. I then need to compare two topologies, so I export the topology I
>> received into another xml string
>> hwloc_topology_export_xmlbuffer(t1, &x1, &l1);
>>
>> It is this export that fails, which implies to me that somehow the import
>> didn't work right. Note that this code worked fine with libxml2, so this is
>> a regression.
>>
>>
>> On Sep 22, 2011, at 9:39 AM, Jeff Squyres wrote:
>>
>>> Yes, I can get some testing of the ompi branch pretty quickly. I can bring
>>> in a new copy of this later today and see what we can see.
>>>
>>> Many thanks!
>>>
>>>
>>> On Sep 19, 2011, at 9:05 AM, Brice Goglin wrote:
>>>
>>>> I pushed the new minimalistic XML import/export implementation without
>>>> libxml2 to the nolibxml branch. If libxml2 is available, it's still used
>>>> by default. --disable-libxml2 or some env variables can be used for
>>>> force the minimalistic implementation if needed. The minimalistic implem
>>>> is only guaranteed to import XML files that were generated by hwloc
>>>> (even if libxml was enabled there).
>>>>
>>>> I also backported most of this to the new v1.2-ompi branch (required to
>>>> backport some other XML cleanups from trunk). This branch will now serve
>>>> as a base for Open MPI's embedded hwloc. The idea is to have a complete
>>>> v1.2 + nolibxml somewhere so that we can at least run make check (Open
>>>> MPI does not embed enough to run hwloc's make check).
>>>>
>>>> How do we proceed now? Can we have the OMPI guys test the new code soon?
>>>> Should I wait for their feedback before merging the nolibxml branch into
>>>> the trunk? I'd like to merge this in v1.3 too (and basically release rc2
>>>> as the actual first feature-complete RC), so getting feedback early
>>>> might be appreciated.
>>>>
>>>> Brice
>>>>
>>>> _______________________________________________
>>>> hwloc-devel mailing list
>>>> [email protected]
>>>> http://www.open-mpi.org/mailman/listinfo.cgi/hwloc-devel
>>>
>>>
>>> --
>>> Jeff Squyres
>>> [email protected]
>>> For corporate legal information go to:
>>> http://www.cisco.com/web/about/doing_business/legal/cri/
>>>
>>>
>>> _______________________________________________
>>> hwloc-devel mailing list
>>> [email protected]
>>> http://www.open-mpi.org/mailman/listinfo.cgi/hwloc-devel
>>
>>
>> --
>> Jeff Squyres
>> [email protected]
>> For corporate legal information go to:
>> http://www.cisco.com/web/about/doing_business/legal/cri/
>>
>
