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Re: [Bug-gsl] msadams.c:973 aborts with GSL_ESANITY

From: Michael Kaufman
Subject: Re: [Bug-gsl] msadams.c:973 aborts with GSL_ESANITY
Date: Mon, 16 Oct 2017 09:13:13 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:52.0) Gecko/20100101 Thunderbird/52.3.0

With the block placed at line 336, this line does _not_ appear in the output (and it still trips).

And yes, I made sure that I did get this changed version compiled and linked.


PS: In my code, I replaced the default error handler with this:

static void msadams_error_handler(const char *reason, const char *file,
                                  int line, int gsl_errno)
  bool doabort = true;

  if (gsl_errno == GSL_ESANITY) doabort = false;

fprintf(stderr, "GSL error [%d] %s:%d : %s\n", gsl_errno, file, line, reason);

  if (doabort) abort();

If I don't replace the default error handler, the program aborts with GSL_ESANITY just as before, even with your change to msadams_failurehandler().

On 10/15/17 4:51 AM, Tuomo Keskitalo wrote:

can you please test add this following snippet of code to end of function msadams_failurehandler(), just before "return GSL_SUCCESS;" and try behavior again, thanks! You should see that line printed in output. Does it still crash? PS. I created bug report, this is [bug #52230].

   if ((int)state->ordprev - (int)ord >= 2)
      printf("TKDEBUG: MSADAMS ORDER CHANGE: ord %d ordprev %d\n", (int)ord, (int)state->ordprev);
       msadams_reset (vstate, dim);

On 09.10.2017 15:52, Michael Kaufman wrote:

Thanks! Looks like the solver hits a bump while accelerating on a high gear. That should not be a problem, though. I'll take a look at the code, but it will take time.

Meanwhile, if you have time, you can add "#define DEBUG" in the beginning of msadams.c and recompile GSL. This should make msadams print out _lots_ of debug info and data, that would help decipher this issue. Interesting stuff happens between t=5116.13 and t=5116.27.

Yeah, wasn't quite expecting a 1 GB output file. Attached is a truncated section that has the steps in question. I've prefixed "PROGRAM" to the output lines that are not coming out of msadams.c


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