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Subject: Re: [OMPI devel] New MOSIX components draft
From: Alex Margolin (alex.margolin_at_[hidden])
Date: 2012-04-01 03:59:21


I traced the problem to the BML component:
Index: ompi/mca/bml/r2/bml_r2.c
===================================================================
--- ompi/mca/bml/r2/bml_r2.c (revision 26191)
+++ ompi/mca/bml/r2/bml_r2.c (working copy)
@@ -105,6 +105,8 @@
              }
          }
          if (NULL == btl_names_argv || NULL == btl_names_argv[i]) {
+ printf("\n\nR1: %p\n\n",
btl->btl_component->btl_version.mca_component_name);
+ printf("\n\nR2: %s\n\n",
btl->btl_component->btl_version.mca_component_name);
              opal_argv_append_nosize(&btl_names_argv,
                                      
btl->btl_component->btl_version.mca_component_name);
          }

I Get (white-spaces removed) for normal run:
R1: 0x7f820e3c31d8
R2: self
R1: 0x7f820e13c598
R2: tcp
... and for my module:
R1: 0x38
  - and then the segmentation fault.
I guess it has something to do with the way I initialize my component -
I'll resume debugging after lunch.

Alex

On 03/31/2012 07:04 PM, Alex Margolin wrote:
>
> P.S. I get the following Error - I'm pretty sure my BTL is to blame here:
>
> alex_at_singularity:~/huji/benchmarks/simple$ mpirun -mca
> btl_base_verbose 100 -mca btl self,mosix hello
> [singularity:10838] mca: base: component_find: unable to open
> /usr/local/lib/openmpi/mca_mpool_sm: libmca_common_sm.so.0: cannot
> open shared object file: No such file or directory (ignored)
> [singularity:10838] mca: base: components_open: Looking for btl
> components
> [singularity:10838] mca: base: components_open: opening btl components
> [singularity:10838] mca: base: components_open: found loaded component
> mosix
> [singularity:10838] mca: base: components_open: component mosix
> register function successful
> [singularity:10838] mca: base: components_open: component mosix open
> function successful
> [singularity:10838] mca: base: components_open: found loaded component
> self
> [singularity:10838] mca: base: components_open: component self has no
> register function
> [singularity:10838] mca: base: components_open: component self open
> function successful
> [singularity:10838] mca: base: component_find: unable to open
> /usr/local/lib/openmpi/mca_coll_sm: libmca_common_sm.so.0: cannot open
> shared object file: No such file or directory (ignored)
> [singularity:10838] select: initializing btl component mosix
> [singularity:10838] select: init of component mosix returned success
> [singularity:10838] select: initializing btl component self
> [singularity:10838] select: init of component self returned success
> [singularity:10838] *** Process received signal ***
> [singularity:10838] Signal: Segmentation fault (11)
> [singularity:10838] Signal code: Address not mapped (1)
> [singularity:10838] Failing at address: 0x30
> [singularity:10838] [ 0] /lib/x86_64-linux-gnu/libc.so.6(+0x36420)
> [0x7fa94a3cd420]
> [singularity:10838] [ 1] /lib/x86_64-linux-gnu/libc.so.6(+0x84391)
> [0x7fa94a41b391]
> [singularity:10838] [ 2]
> /lib/x86_64-linux-gnu/libc.so.6(__strdup+0x16) [0x7fa94a41b086]
> [singularity:10838] [ 3]
> /usr/local/lib/libmpi.so.0(opal_argv_append_nosize+0xf7) [0x7fa94add66a4]
> [singularity:10838] [ 4] /usr/local/lib/openmpi/mca_bml_r2.so(+0x1cf5)
> [0x7fa946177cf5]
> [singularity:10838] [ 5] /usr/local/lib/openmpi/mca_bml_r2.so(+0x1e50)
> [0x7fa946177e50]
> [singularity:10838] [ 6]
> /usr/local/lib/openmpi/mca_pml_ob1.so(mca_pml_ob1_add_procs+0x12f)
> [0x7fa946382b6d]
> [singularity:10838] [ 7]
> /usr/local/lib/libmpi.so.0(ompi_mpi_init+0x909) [0x7fa94acd1549]
> [singularity:10838] [ 8] /usr/local/lib/libmpi.so.0(MPI_Init+0x16c)
> [0x7fa94ad033ec]
> [singularity:10838] [ 9]
> /home/alex/huji/benchmarks/simple/hello(_ZN3MPI4InitERiRPPc+0x23)
> [0x409e2d]
> [singularity:10838] [10]
> /home/alex/huji/benchmarks/simple/hello(main+0x22) [0x408f66]
> [singularity:10838] [11]
> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed) [0x7fa94a3b830d]
> [singularity:10838] [12] /home/alex/huji/benchmarks/simple/hello()
> [0x408e89]
> [singularity:10838] *** End of error message ***
> --------------------------------------------------------------------------
>
> mpirun noticed that process rank 0 with PID 10838 on node singularity
> exited on signal 11 (Segmentation fault).
> --------------------------------------------------------------------------
>
> alex_at_singularity:~/huji/benchmarks/simple$ mpirun -mca btl self,tcp hello
> [singularity:10841] mca: base: component_find: unable to open
> /usr/local/lib/openmpi/mca_mpool_sm: libmca_common_sm.so.0: cannot
> open shared object file: No such file or directory (ignored)
> [singularity:10841] mca: base: component_find: unable to open
> /usr/local/lib/openmpi/mca_coll_sm: libmca_common_sm.so.0: cannot open
> shared object file: No such file or directory (ignored)
> Hello world!
> alex_at_singularity:~/huji/benchmarks/simple$