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Subject: Re: [OMPI devel] [EXTERNAL] 1.7.4rc2r30031 - OpenBSD-5 mpirun hangs
From: Ralph Castain (rhc_at_[hidden])
Date: 2013-12-20 19:15:59


This is the same problem Jeff and I are looking at on Solaris - it requires a slow machine to make it appear. I'm investigating and think I know where the issue might lie (a timer that is firing to indicate a failed connection attempt and causing a race condition)

On Dec 20, 2013, at 4:02 PM, Paul Hargrove <phhargrove_at_[hidden]> wrote:

> FWIW:
> I've confirmed that this is REGRESSION relative to 1.7.2, which works fine on OpenBSD-5
>
> I could not build 1.7.3 due to some of issues fixed for 1.7.4rc in the past 24 hours.
> I am going to try back-porting the fix(es) to see if 1.7.3 works or not .
>
> -Paul
>
>
> On Fri, Dec 20, 2013 at 3:16 PM, Paul Hargrove <phhargrove_at_[hidden]> wrote:
> Below is the backtrace again, this time configured w/ --enable-debug and for all threads.
> -Paul
>
> Thread 2 (thread 1021110):
> #0 0x00001bc0ef6c5e3a in nanosleep () at <stdin>:2
> #1 0x00001bc0f317c2d4 in nanosleep (rqtp=0x7f7ffffbc900, rmtp=0x0)
> at /usr/src/lib/librthread/rthread_cancel.c:274
> #2 0x00001bc0f2cd4621 in orte_routed_base_register_sync (setup=true)
> at /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/openmpi-1.7-latest/orte/mca/routed/base/routed_base_fns.c:344
> #3 0x00001bc0efc5d602 in init_routes (job=3563782145, ndat=0x0)
> at /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/openmpi-1.7-latest/orte/mca/routed/binomial/routed_binomial.c:705
> #4 0x00001bc0f2c9c832 in orte_ess_base_app_setup (db_restrict_local=true)
> at /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/openmpi-1.7-latest/orte/mca/ess/base/ess_base_std_app.c:233
> #5 0x00001bc0f39ea9ec in rte_init ()
> at /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/openmpi-1.7-latest/orte/mca/ess/env/ess_env_module.c:146
> #6 0x00001bc0f2c68764 in orte_init (pargc=0x0, pargv=0x0, flags=32)
> at /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/openmpi-1.7-latest/orte/runtime/orte_init.c:158
> #7 0x00001bc0f75061c5 in ompi_mpi_init (argc=1, argv=0x7f7ffffbced0, requested=0, provided=0x7f7ffffbce38)
> at /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/openmpi-1.7-latest/ompi/runtime/ompi_mpi_init.c:451
> #8 0x00001bc0f7544b96 in PMPI_Init (argc=0x7f7ffffbce6c, argv=0x7f7ffffbce60) at pinit.c:84
> #9 0x00001bbeec701093 in main (argc=1, argv=0x7f7ffffbced0) at ring_c.c:19
> Current language: auto; currently asm
>
> Thread 1 (thread 1023703):
> #0 0x00001bc0ef6d68fa in poll () at <stdin>:2
> #1 0x00001bc0f317c0fd in poll (fds=0x1bc0f9482d00, nfds=2, timeout=-1)
> at /usr/src/lib/librthread/rthread_cancel.c:331
> #2 0x00001bc0eebf47a8 in poll_dispatch (base=0x1bc0f5987400, tv=0x0)
> at /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/openmpi-1.7-latest/opal/mca/event/libevent2021/libevent/poll.c:165
> #3 0x00001bc0eebe8314 in opal_libevent2021_event_base_loop (base=0x1bc0f5987400, flags=1)
> at /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/openmpi-1.7-latest/opal/mca/event/libevent2021/libevent/event.c:1631
> #4 0x00001bc0f2c68855 in orte_progress_thread_engine (obj=0x1bc0f310e160)
> at /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/openmpi-1.7-latest/orte/runtime/orte_init.c:180
> #5 0x00001bc0f317911e in _rthread_start (v=Variable "v" is not available.
> ) at /usr/src/lib/librthread/rthread.c:122
> #6 0x00001bc0ef6c003b in __tfork_thread () at /usr/src/lib/libc/arch/amd64/sys/tfork_thread.S:75
> Cannot access memory at address 0x1bc0f857c000
>
>
>
> On Fri, Dec 20, 2013 at 2:48 PM, Paul Hargrove <phhargrove_at_[hidden]> wrote:
> Brian,
>
> Of course, I should have thought of that myself.
> See below for backtrace from a singleton run.
>
> I'm starting an --enable-debug build to maybe get some line number info too.
>
> -Paul
>
> (gdb) where
> #0 0x00000406457a9e3a in nanosleep () at <stdin>:2
> #1 0x000004063947e2d4 in nanosleep (rqtp=0x7f7ffffeca30, rmtp=0x0)
> at /usr/src/lib/librthread/rthread_cancel.c:274
> #2 0x0000040644a5a89b in orte_routed_base_register_sync ()
> from /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/INST/lib/libopen-rte.so.7.0
> #3 0x00000406490d943c in init_routes ()
> from /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/INST/lib/openmpi/mca_routed_binomial.so
> #4 0x0000040644a3c37f in orte_ess_base_app_setup ()
> from /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/INST/lib/libopen-rte.so.7.0
> #5 0x000004063eb1797d in rte_init ()
> from /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/INST/lib/openmpi/mca_ess_env.so
> #6 0x0000040644a1a3fe in orte_init ()
> from /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/INST/lib/libopen-rte.so.7.0
> #7 0x00000406482c7976 in ompi_mpi_init ()
> from /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/INST/lib/libmpi.so.4.0
> #8 0x00000406482eac92 in PMPI_Init ()
> from /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/INST/lib/libmpi.so.4.0
> #9 0x0000040438c01093 in main (argc=1, argv=0x7f7ffffece60) at ring_c.c:19
> Current language: auto; currently asm
>
>
>
> On Fri, Dec 20, 2013 at 2:38 PM, Barrett, Brian W <bwbarre_at_[hidden]> wrote:
> Paul -
>
> Any chance you could grab a stack trace from the mpi app? That's probably the fastest next step
>
> Brian
>
>
>
> Sent with Good (www.good.com)
>
>
> -----Original Message-----
> From: Paul Hargrove [phhargrove_at_[hidden]]
> Sent: Friday, December 20, 2013 03:33 PM Mountain Standard Time
> To: Open MPI Developers
> Subject: [EXTERNAL] [OMPI devel] 1.7.4rc2r30031 - OpenBSD-5 mpirun hangs
>
> With plenty of help from Jeff and Ralph's bug fixes in the past 24 hours, I can now build OMPI for NetBSD. However, running even a simple example fails:
>
> Having set PATH and LD_LIBARY_PATH:
> $ mpirun -np 1 examples/ring_c
> just hangs
>
> Output from "top" shows idle procs:
> PID USERNAME PRI NICE SIZE RES STATE WAIT TIME CPU COMMAND
> 31841 phargrov 10 0 2140K 3960K sleep/1 nanosle 0:00 0.00% ring_c
> 13490 phargrov 2 0 2540K 4892K sleep/1 poll 0:00 0.00% orterun
>
> Distrusting then env vars and relying instead on the auto-prefix behavior:
> $ /home/phargrov/OMPI/openmpi-1.7-latest-openbsd5-amd64/INST/bin/mpirun -np 1 examples/ring_c
> also hangs
>
> Not sure exactly what to infer from this, but a "bogus" btl doesn't produce any complaint, which may indicate how far startup got:
> $ mpirun -mca btl bogus -np 1 examples/ring_c
> Still hangs, and no complaint about the blt selection
>
> All three cases above are singleton (-np 1) runs, but the behavior with "-np 2" is the same.
>
> This does NOT appear to be an ORTE problem:
> -bash-4.2$ orterun -np 1 date
> Fri Dec 20 14:11:42 PST 2013
> -bash-4.2$ orterun -np 2 date
> Fri Dec 20 14:11:45 PST 2013
> Fri Dec 20 14:11:45 PST 2013
>
> Let me know what sort of verbose mca parameters to set and I'll collect the info.
> Compressed output of "ompi_info --all" is attached.
>
> -Paul
>
> --
> Paul H. Hargrove PHHargrove_at_[hidden]
> Future Technologies Group
> Computer and Data Sciences Department Tel: +1-510-495-2352
> Lawrence Berkeley National Laboratory Fax: +1-510-486-6900
>
> _______________________________________________
> devel mailing list
> devel_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/devel
>
>
>
> --
> Paul H. Hargrove PHHargrove_at_[hidden]
> Future Technologies Group
> Computer and Data Sciences Department Tel: +1-510-495-2352
> Lawrence Berkeley National Laboratory Fax: +1-510-486-6900
>
>
>
> --
> Paul H. Hargrove PHHargrove_at_[hidden]
> Future Technologies Group
> Computer and Data Sciences Department Tel: +1-510-495-2352
> Lawrence Berkeley National Laboratory Fax: +1-510-486-6900
>
>
>
> --
> Paul H. Hargrove PHHargrove_at_[hidden]
> Future Technologies Group
> Computer and Data Sciences Department Tel: +1-510-495-2352
> Lawrence Berkeley National Laboratory Fax: +1-510-486-6900
> _______________________________________________
> devel mailing list
> devel_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/devel