Project

General

Profile

Bug #1089

invalid pointer in "free"

Added by John Abbott almost 7 years ago. Updated almost 7 years ago.

Status:
In Progress
Priority:
Normal
Assignee:
John Abbott
Category:
Various
Target version:
CoCoALib-1.0
Start date:
11 Jul 2017
Due date:
% Done:

10%

Estimated time:
Spent time:
1.00 h

Description

I have a non-trivial program written using CoCoALib which causes the following error (on Fedora Linux):

*** Error in `./BigGCD-factor': free(): invalid pointer: 0x0000000001ef2bc8 ***

The problem appears after about 54 hours' CPU, and seems not to occur with small parameters (and faster run times).
A second run reproduced the same problem at the same point (as far as I recall).

History

#1 Updated by John Abbott almost 7 years ago

  • Subject changed from inavlid pointer in "free" to invalid pointer in "free"

How to debug this? Finding a smaller/faster example would help... but how?
Perhaps I'll try running it with valgrind or maybe gdb?

It'll take a long time, I fear.

UPDATE With valgrind I estimate more than 1500 hours' run-time; so I have stopped it. Trying gdb instead...

#2 Updated by John Abbott almost 7 years ago

  • Status changed from New to In Progress
  • Assignee set to John Abbott
  • % Done changed from 0 to 10

After about 150 hours the program running under gdb the program finally died from a SIGABRT.

The problem occurred inside DistrMPolyImplPP::ourDeleteSummands; apparently a coefficient pointer is invalid (corrupted?)

#3 Updated by John Abbott about 1 month ago

  • Related to Feature #743: Better errors: give supplementary info about the error added

#4 Updated by John Abbott about 1 month ago

  • Related to deleted (Feature #743: Better errors: give supplementary info about the error)

Also available in: Atom PDF