Hi,
this was the problem, now I managed to get the backtrace. Unfortunately I
really can't make much sense of it... I'm rather surprised that the error
happens in constructor of the class (EvenPolicy), but commenting out a
seemingly unrelated forall loop makes the program work... Anyway, here's the
stack
#0 gdbShouldBreakHere () at gdb.c:27
#1 0x0000000000618063 in chpl_exit_common (status=1, all=0) at chplexit.c:38
#2 0x00000000006180d1 in chpl_exit_any (status=1) at chplexit.c:57
#3 0x0000000000611d7a in chpl_error (
message=0x6d713d "attempt to dereference nil", lineno=165,
filename=0x6d77f0
"/home/john/projects/chapel/chapel/modules/internal/ChapelArray.chpl") at
error.c:85
#4 0x00000000004c085d in chpl_check_nil (
filename=0x6d77f0
"/home/john/projects/chapel/chapel/modules/internal/ChapelArray.chpl",
lineno=165, ptr=0x0)
at
/home/john/projects/chapel/chapel/runtime//include/chpl-comm-compiler-macros.h:196
#5 chpl__convertRuntimeTypeToValue2 (d=0x7fffffffa4b0, _retArg=0x7fffffffa4a0)
at ChapelArray.chpl:165
#6 0x00000000005c0547 in EvenPolicy_chpl (dom_chpl=0x91bc00 <Space_chpl>,
targetLocales_chpl=0x7fffffffcbb0) at VariBlockPolicies.chpl:334
#7 0x0000000000518652 in chpl__init_test2 (_ln_chpl=1,
_fn_chpl=0x6d7dbb "src/test2.chpl") at test2.chpl:25
#8 0x000000000051f9bf in chpl_gen_main (_arg=0x928330 <chpl_gen_main_arg>)
at test2.chpl:1
#9 0x0000000000617fe8 in chpl_executable_init () at chpl-init.c:269
#10 0x000000000061cdeb in chpl_task_callMain (
chpl_main=0x617fcb <chpl_executable_init>) at tasks-fifo.c:394
---Type <return> to continue, or q <return> to quit---
#11 0x000000000060e784 in main (argc=6, argv=0x7fffffffd948) at main.c:32
The line 334 in VariBlockPolicies.chpl is
proc EvenPolicy(dom: domain, targetLocales: [] locale = Locales, param rank =
dom.rank, type idxType = dom.idxType) {
17.03.2015, 00:37, "Brad Chamberlain" <[email protected]>:
> 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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