No luck with gdb 7.5.1. I can get it to run, but it hits an internal error and bails out. Thus, I'm stuck with Apple's 6.3.50. I suppose I'll try to restructure the app so that I don't have to spawn the mpi process with a fork from the other one.
Geoffrey On Thu, Feb 21, 2013 at 4:38 PM, Geoffrey Irving <irv...@naml.us> wrote: > No, I don't really have any idea what it's doing. You have to add > manual sleeps and attach another instance of gdb if you want to step > through the child, since I also can't get follow-fork-mode child to > work. I only tried that once, and it segfaulted accessing the zero > pointer destroying the stack in the process. I haven't done manual > stepping or printf searches, so I don't know where in MPI_Init it > breaks. > > I'm trying to install gdb 7.5.1 now (a nontrivial process on Mac, > unfortunately) to see if that fixes it. > > Geoffrey > > On Thu, Feb 21, 2013 at 4:28 PM, Ralph Castain <r...@open-mpi.org> wrote: >> Hmmm...how about that? Yeah, it doesn't work with the devel trunk either - >> I'd missed that point. >> >> No idea why, I'm afraid - never tried it before. Are you sure it "crashes"? >> I'm still getting a child status of "0", but no message output. My guess is >> that the I/O is being lost for some reason. >> >> On Feb 21, 2013, at 4:09 PM, Geoffrey Irving <irv...@naml.us> wrote: >> >>> Actually, I don't see it printing "We're an MPI program!" under gdb, >>> which means it isn't working. >>> >>> Geoffrey >>> >>> On Thu, Feb 21, 2013 at 4:07 PM, Ralph Castain <r...@open-mpi.org> wrote: >>>> Hmmm...works with 1.6.4 for me on Mac 10.8.2: >>>> >>>> Ralphs-iMac:v1.6 rhc$ ./fork-bug >>>> We're an MPI program! >>>> child status = 0 >>>> Ralphs-iMac:v1.6 rhc$ gdb ./fork-bug >>>> GNU gdb 6.3.50-20050815 (Apple version gdb-1820) (Sat Jun 16 02:40:11 UTC >>>> 2012) >>>> Copyright 2004 Free Software Foundation, Inc. >>>> GDB is free software, covered by the GNU General Public License, and you >>>> are >>>> welcome to change it and/or distribute copies of it under certain >>>> conditions. >>>> Type "show copying" to see the conditions. >>>> There is absolutely no warranty for GDB. Type "show warranty" for details. >>>> This GDB was configured as "x86_64-apple-darwin"...Reading symbols for >>>> shared libraries ... done >>>> >>>> (gdb) r >>>> Starting program: /Volumes/RHCHD/rhc/openmpi/v1.6/fork-bug >>>> Reading symbols for shared libraries ++............................. done >>>> child status = 0 >>>> >>>> Program exited normally. >>>> (gdb) >>>> >>>> Afraid I have no idea why you might be hitting the problem, though... >>>> >>>> >>>> On Feb 21, 2013, at 3:50 PM, Geoffrey Irving <irv...@naml.us> wrote: >>>> >>>>> The singleton fork/exec itself is fine, since normal MPI programs work >>>>> under gdb (e.g., fork-bug.c without the fork). gdb is has >>>>> follow-fork-mode set to parent, so it's odd that gdb is looking at the >>>>> child process's trickery at all. >>>>> >>>>> I've confirmed that it's still broken under 1.6.4, unfortunately. >>>>> >>>>> Geoffrey >>>>> >>>>> On Thu, Feb 21, 2013 at 3:36 PM, Ralph Castain <r...@open-mpi.org> wrote: >>>>>> Singletons fork/exec a daemon to support them - my guess is that gdb may >>>>>> not like it on your machine? >>>>>> >>>>>> FWIW - it runs fine for me using the developer's trunk. You might try >>>>>> with 1.6.4 in case it's a bug in 1.6.0 >>>>>> >>>>>> >>>>>> On Feb 21, 2013, at 3:18 PM, Geoffrey Irving <irv...@naml.us> wrote: >>>>>> >>>>>>> The attached program illustrates the problem. It forks, and the child >>>>>>> calls MPI_Init. This works fine unless I'm inside gdb. Inside gdb, >>>>>>> MPI_Init silently crashes. >>>>>>> >>>>>>> I'm using OpenMPI 1.6.0 on Mac 10.8.2. I'm running the program >>>>>>> directly, not through mpirun. >>>>>>> >>>>>>> Any ideas what might be wrong? >>>>>>> >>>>>>> Thanks, >>>>>>> Geoffrey >>>>>>> >>>>>>> cone:scratch% /usr/local/bin/mpicc -o fork-bug fork-bug.c >>>>>>> cone:scratch% ./fork-bug >>>>>>> We're an MPI program! >>>>>>> child status = 0 >>>>>>> cone:scratch% gdb ./fork-bug >>>>>>> gdb ./fork-bug >>>>>>> GNU gdb 6.3.50-20050815 (Apple version gdb-1824) (Thu Nov 15 10:42:43 >>>>>>> UTC 2012) >>>>>>> Copyright 2004 Free Software Foundation, Inc. >>>>>>> GDB is free software, covered by the GNU General Public License, and >>>>>>> you are >>>>>>> welcome to change it and/or distribute copies of it under certain >>>>>>> conditions. >>>>>>> Type "show copying" to see the conditions. >>>>>>> There is absolutely no warranty for GDB. Type "show warranty" for >>>>>>> details. >>>>>>> This GDB was configured as "x86_64-apple-darwin"...Reading symbols for >>>>>>> shared libraries ... done >>>>>>> >>>>>>> (gdb) run >>>>>>> Reading symbols for shared libraries ++............................. >>>>>>> done >>>>>>> child status = 5 >>>>>>> >>>>>>> Program exited normally. >>>>>>> (gdb) cone:scratch% >>>>>>> <fork-bug.c>_______________________________________________ >>>>>>> users mailing list >>>>>>> us...@open-mpi.org >>>>>>> http://www.open-mpi.org/mailman/listinfo.cgi/users >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> users mailing list >>>>>> us...@open-mpi.org >>>>>> http://www.open-mpi.org/mailman/listinfo.cgi/users >>>>> _______________________________________________ >>>>> users mailing list >>>>> us...@open-mpi.org >>>>> http://www.open-mpi.org/mailman/listinfo.cgi/users >>>> >>>> >>>> _______________________________________________ >>>> users mailing list >>>> us...@open-mpi.org >>>> http://www.open-mpi.org/mailman/listinfo.cgi/users >>> _______________________________________________ >>> users mailing list >>> us...@open-mpi.org >>> http://www.open-mpi.org/mailman/listinfo.cgi/users >> >> >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/users
