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From: Gleb Natapov (glebn_at_[hidden])
Date: 2007-07-09 14:04:33


On Mon, Jul 09, 2007 at 10:41:52AM -0400, Tim Prins wrote:
> Gleb Natapov wrote:
> > On Sun, Jul 08, 2007 at 12:41:58PM -0400, Tim Prins wrote:
> >> On Sunday 08 July 2007 08:32:27 am Gleb Natapov wrote:
> >>> On Fri, Jul 06, 2007 at 06:36:13PM -0400, Tim Prins wrote:
> >>>> While looking into another problem I ran into an issue which made ob1
> >>>> segfault on me. Using gm, and running the test test_dan1 in the onesided
> >>>> test suite, if I limit the gm freelist by too much, I get a segfault.
> >>>> That is,
> >>>>
> >>>> mpirun -np 2 -mca btl gm,self -mca btl_gm_free_list_max 1024 test_dan1
> >>>>
> >>>> works fine, but
> >>>>
> >>>> mpirun -np 2 -mca btl gm,self -mca btl_gm_free_list_max 512 test_dan1
> >>> I cannot, unfortunately, reproduce this with openib BTL.
> >>>
> >>>> segfaults. Here is the relevant output from gdb:
> >>>>
> >>>> Program received signal SIGSEGV, Segmentation fault.
> >>>> [Switching to Thread 1077541088 (LWP 15600)]
> >>>> 0x404d81c1 in mca_pml_ob1_send_fin (proc=0x9bd9490, bml_btl=0xd323580,
> >>>> hdr_des=0x9e54e78, order=255 '�', status=1) at pml_ob1.c:267
> >>>> 267 MCA_PML_OB1_DES_ALLOC(bml_btl, fin, order,
> >>>> sizeof(mca_pml_ob1_fin_hdr_t));
> >>> can you send me what's inside bml_btl?
> >> It turns out that the order of arguments to mca_pml_ob1_send_fin was wrong. I
> >> fixed this in r15304. But now we hang instead of segfault, and have both
> >> processes just looping through opal_progress. I really don't what to look
> >> for. Any hints?
> >>
> > Can you look in gdb at mca_pml_ob1.rdma_pending?
> Yeah, rank 0 has nothing on the list, and rank 1 has 48 things.
Do you run both ranks on the same node? Can you try to run them on
different node?

--
			Gleb.