For the mailing lists -- Dorian found a bug here: our one-sided code
assumes that the datatype will be "small" (i.e., a packed version of
the datatype will fit within the eager limit fragment size in OMPI).
Dorian's datatype is much larger than that, leading to an amorphous
failure. I've failed a bug about this:
https://svn.open-mpi.org/trac/ompi/ticket/1905
On Apr 23, 2009, at 3:36 PM, doriankrause wrote:
Hi,
I'm currently looking at this bug:
http://www.open-mpi.org/community/lists/users/2008/12/7611.php
I'm using the 1.3.2 tarball.
Valgrind tells me that there is an invalid write (of size 1) in
osc_pt2pt_data_move.c at line 229 which is the
statement
memcpy((unsigned char*) buffer->payload + written_data,
packed_ddt, packed_ddt_len);
in the function ompi_osc_pt2pt_sendreq_send.
I have
(gdb) p packed_ddt_len
$2 = 44852
and
(gdb) p written_data
$3 = 36
but I can't figure out what the actual size of buffer->payload is. I
have
(gdb) p *buffer
$6 = {mpireq = {super = {super = {super = {
obj_magic_id = 16046253926196952813, obj_class = 0x4f5240,
obj_reference_count = 1,
cls_init_file_name = 0x2efe0b "class/opal_free_list.c",
cls_init_lineno = 114}, opal_list_next = 0x0,
opal_list_prev =
0x0,
item_free = 1, opal_list_item_refcount = 0,
opal_list_item_belong_to = 0x0}}, request = 0x5a35, status = {
MPI_SOURCE = 23094, MPI_TAG = 23095, MPI_ERROR = 23096, _count =
23097,
_cancelled = 23098}, cbfunc = 0x4e6cc5
<ompi_osc_pt2pt_sendreq_send_cb>,
cbdata = 0x8681080}, payload = 0x86bc0d8, len = 23102}
Is len the size of payload?
In osc_pt2pt_component.c I found the statement
/* adjust size to be multiple of ompi_ptr_t to avoid alignment
issues*/
aligned_size = sizeof(ompi_osc_pt2pt_buffer_t) +
(sizeof(ompi_osc_pt2pt_buffer_t) % sizeof(ompi_ptr_t)) +
mca_osc_pt2pt_component.p2p_c_eager_size;
OBJ_CONSTRUCT(&mca_osc_pt2pt_component.p2p_c_buffers,
opal_free_list_t);
opal_free_list_init(&mca_osc_pt2pt_component.p2p_c_buffers,
aligned_size,
OBJ_CLASS(ompi_osc_pt2pt_buffer_t),
1, -1, 1);
but this doesn't help me to understand ...
Can you help with this? Where can I find the allocation routine for
the
buffer?
Or do you know why there could be an invalid write?
Thanks + Best regards,
Dorian
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Jeff Squyres
Cisco Systems
