I thought --gdb should set this breakpoint automatically, but must be
mis-remembering... Would you try typing:
break gdbShouldBreakHere
in each of the gdb consoles before typing 'run' and see if that helps?
Thanks, and sorry for my bad memory if this works,
-Brad
On Mon, 16 Mar 2015, John MacFrenz wrote:
Hi,
I had already tried that, and tried again after your post, but
unfortunately couldn't get it work. I can get the program run in gdb and
crash, but when trying to see the backtrace gdb just says "no stack" on
both locales.
17.03.2015, 00:13, "Brad Chamberlain" <[email protected]>:
Hi John --
Since everyone here is sprinting toward the code freeze for 1.11, I'll
send out a pointer rather than diving into an analysis at present:
Have you discovered the CHPL_COMM_USE_GDB environment variable described
in doc/[release/]README.executing? With it and GASNet, you can run your
program, popping up an xterm per locale which tends to work for failures
that fail on a small number of nodes (< 4 or so). Compiling with -g and
--cpp-lines and running with the --gdb flag should cause the program to
break when this error is printed out, permitting you to get the stack
trace that led to the error, which may help.
If you get a stack trace but still can't determine why the error is
occurring, feel free to send it along.
-Brad
On Mon, 16 Mar 2015, John MacFrenz wrote:
Hi,
I'm having a problem where my program fails with error:
/home/john/projects/chapel/chapel/modules/internal/ChapelArray.chpl:165:
error: attempt to dereference nil
I haven't had success in trying to isolate the problem so unfortunately I
don't have a simple example file which would reproduce the problem. However I
have a test in my git branch of chapel which causes the problem. The branch in
question is here
https://github.com/jfrenz/chapel/tree/VariBlockDist
The failing test is located at
test/distributions/jfrenz/block-variblock/simple-coexist.chpl . If you comment
out either of the forall loops in that file it runs fine. I have had it fail at
least with GASNET_SPAWNFN=L and two or four locales.
In that git branch I have modified only files in modules/dists ,
modules/standard and in test .
Chpl info:
CHPL_HOST_PLATFORM: linux64
CHPL_HOST_COMPILER: gnu
CHPL_TARGET_PLATFORM: linux64
CHPL_TARGET_COMPILER: gnu
CHPL_TARGET_ARCH: unknown
CHPL_LOCALE_MODEL: flat
CHPL_COMM: gasnet
CHPL_COMM_SUBSTRATE: udp
CHPL_GASNET_SEGMENT: everything
CHPL_TASKS: fifo
CHPL_LAUNCHER: amudprun
CHPL_TIMERS: generic
CHPL_MEM: cstdlib
CHPL_MAKE: make
CHPL_ATOMICS: intrinsics
CHPL_NETWORK_ATOMICS: none
CHPL_GMP: gmp
CHPL_HWLOC: none
CHPL_REGEXP: re2
CHPL_WIDE_POINTERS: struct
CHPL_LLVM: none
CHPL_AUX_FILESYS: none
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