Re: [OMPI users] Connection reset by peer

George Bosilca Tue, 21 Feb 2006 16:13:25 -0500

The stack trace is reported by one of our internal tools. The last 2entries belong to the Open MPI project and correspond the the signalhandler. When you look at the stack you should ignore the last 2entries (number [0] and [1]).

The frag_recv is the place where we detect that one of the remotenode failed. Once one of the node segfault, the other will abort theMPI jobs, as by default we follow the MPI specifications.

It's very difficult to say what's wrong with such little information.If you can create a non NDA test that fails for you, you will makeour life easier.


  Thanks,
    george.

On Feb 21, 2006, at 3:12 PM, Luke Cyca wrote:

Hi,

I'm experiencing seemingly random crashes when running my program
with OpenMPI version 1.0.2a7r9094.  My simulation runs fine through
lots of iterations, sometimes for several hours, and then quits with
the following output.

Signal:11 info.si_errno:0(Success) si_code:1(SEGV_MAPERR)
Failing at addr:0x37e3200
[0] func:/usr/lib/libopal.so.0 [0x2aaaac0ab2da]
[1] func:/lib/libpthread.so.0 [0x2aaaaacd04d0]
[2] <My program's stack trace removed for NDA paranoia>
*** End of error message ***
[maltose:09314] mca_btl_tcp_frag_send: writev failed with errno=104

Sometimes the error gets reported by frag_recv instead:

[glucose:09277] mca_btl_tcp_frag_recv: writev failed with errno=104


Error 104 corresponds to ECONNRESET "Connection reset by peer".  In
all other situations though, my network seems to be operating well.
Running `ifconfig eth0` on any of the nodes reports no errors or
dropped packets.

I had the same behavior when using the 1.0.1r8453 release.

I'm unsure how to troubleshoot this further.  Any help or suggestions
would be greatly appreciated.

Here's my ompi_info output:

                Open MPI: 1.0.2a7r9094
   Open MPI SVN revision: r9094
                Open RTE: 1.0.2a7r9094
   Open RTE SVN revision: r9094
                    OPAL: 1.0.2a7r9094
       OPAL SVN revision: r9094
                  Prefix: /usr/local
Configured architecture: x86_64-unknown-linux-gnu
           Configured by: zymo
           Configured on: Mon Feb 20 15:56:27 PST 2006
          Configure host: idose
                Built by: zymo
                Built on: Mon Feb 20 16:14:53 PST 2006
              Built host: idose
              C bindings: yes
            C++ bindings: yes
      Fortran77 bindings: yes (all)
      Fortran90 bindings: no
              C compiler: gcc
     C compiler absolute: /usr/bin/gcc
            C++ compiler: g++
   C++ compiler absolute: /usr/bin/g++
      Fortran77 compiler: g77
  Fortran77 compiler abs: /usr/bin/g77
      Fortran90 compiler: none
  Fortran90 compiler abs: none
             C profiling: yes
           C++ profiling: yes
     Fortran77 profiling: yes
     Fortran90 profiling: no
          C++ exceptions: no
          Thread support: posix (mpi: no, progress: no)
  Internal debug support: no
     MPI parameter check: runtime
Memory profiling support: no
Memory debugging support: no
         libltdl support: 1
              MCA memory: malloc_hooks (MCA v1.0, API v1.0,
Component v1.0.2)

MCA paffinity: linux (MCA v1.0, API v1.0, Componentv1.0.2)

           MCA maffinity: first_use (MCA v1.0, API v1.0, Component
v1.0.2)

MCA timer: linux (MCA v1.0, API v1.0, Componentv1.0.2)

           MCA allocator: basic (MCA v1.0, API v1.0, Component v1.0)
           MCA allocator: bucket (MCA v1.0, API v1.0, Component v1.0)

MCA coll: basic (MCA v1.0, API v1.0, Componentv1.0.2)

                MCA coll: self (MCA v1.0, API v1.0, Component v1.0.2)
                MCA coll: sm (MCA v1.0, API v1.0, Component v1.0.2)

MCA io: romio (MCA v1.0, API v1.0, Componentv1.0.2)

               MCA mpool: sm (MCA v1.0, API v1.0, Component v1.0.2)
                 MCA pml: ob1 (MCA v1.0, API v1.0, Component v1.0.2)
                 MCA pml: teg (MCA v1.0, API v1.0, Component v1.0.2)
                 MCA bml: r2 (MCA v1.0, API v1.0, Component v1.0.2)
                 MCA bml: r2 (MCA v1.0, API v1.0, Component v1.0.2)
                 MCA ptl: self (MCA v1.0, API v1.0, Component v1.0.2)
                 MCA ptl: sm (MCA v1.0, API v1.0, Component v1.0.2)
                 MCA ptl: tcp (MCA v1.0, API v1.0, Component v1.0.2)
                 MCA btl: self (MCA v1.0, API v1.0, Component v1.0.2)
                 MCA btl: sm (MCA v1.0, API v1.0, Component v1.0.2)
                 MCA btl: tcp (MCA v1.0, API v1.0, Component v1.0)

MCA topo: unity (MCA v1.0, API v1.0, Componentv1.0.2)

                 MCA gpr: null (MCA v1.0, API v1.0, Component v1.0.2)

MCA gpr: proxy (MCA v1.0, API v1.0, Componentv1.0.2)

                 MCA gpr: replica (MCA v1.0, API v1.0, Component
v1.0.2)

MCA iof: proxy (MCA v1.0, API v1.0, Componentv1.0.2)

                 MCA iof: svc (MCA v1.0, API v1.0, Component v1.0.2)

MCA ns: proxy (MCA v1.0, API v1.0, Componentv1.0.2)

                  MCA ns: replica (MCA v1.0, API v1.0, Component
v1.0.2)
                 MCA oob: tcp (MCA v1.0, API v1.0, Component v1.0)
                 MCA ras: dash_host (MCA v1.0, API v1.0, Component
v1.0.2)
                 MCA ras: hostfile (MCA v1.0, API v1.0, Component
v1.0.2)
                 MCA ras: localhost (MCA v1.0, API v1.0, Component
v1.0.2)

MCA ras: slurm (MCA v1.0, API v1.0, Componentv1.0.2)

                 MCA rds: hostfile (MCA v1.0, API v1.0, Component
v1.0.2)
                 MCA rds: resfile (MCA v1.0, API v1.0, Component
v1.0.2)
               MCA rmaps: round_robin (MCA v1.0, API v1.0,
Component v1.0.2)

MCA rmgr: proxy (MCA v1.0, API v1.0, Componentv1.0.2)

                MCA rmgr: urm (MCA v1.0, API v1.0, Component v1.0.2)
                 MCA rml: oob (MCA v1.0, API v1.0, Component v1.0.2)
                 MCA pls: daemon (MCA v1.0, API v1.0, Component
v1.0.1)
                 MCA pls: fork (MCA v1.0, API v1.0, Component v1.0.2)

MCA pls: proxy (MCA v1.0, API v1.0, Componentv1.0.2)

                 MCA pls: rsh (MCA v1.0, API v1.0, Component v1.0.2)

MCA pls: slurm (MCA v1.0, API v1.0, Componentv1.0.2)

                 MCA sds: env (MCA v1.0, API v1.0, Component v1.0.2)
                 MCA sds: pipe (MCA v1.0, API v1.0, Component v1.0.2)
                 MCA sds: seed (MCA v1.0, API v1.0, Component v1.0.2)
                 MCA sds: singleton (MCA v1.0, API v1.0, Component
v1.0.2)

MCA sds: slurm (MCA v1.0, API v1.0, Componentv1.0.2)


____________
Luke Cyca
(604) 678-1388 ext. 32
l...@zymeworks.com
www.zymeworks.com


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Re: [OMPI users] Connection reset by peer

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