Error Segmentation fault core dumped

Question

Im new in python and am getting a strange error   Segmentation fault  core dumped    When i execute the following code     class Workspace QMainWindow  Ui MainWindow           This class is for managing the whole GUI  Workspace           Currently a Workspace is similar to a MainWindow              def   init   self            p  subprocess Popen   java -Xmx256m -jar bin HelloWorld jar   cwd r  home karen sphinx4-1 0beta5-src sphinx4-1 0beta5    shell True  stdout subprocess PIPE  bufsize  4024          try              from Queue import Queue  Empty         except ImportError              while True       from queue import Queue  Empty    python 3 x                 print  error           ON POSIX    posix  in sys builtin module names          def enqueue output out  queue               for line in iter out readline  b                     queue put line              out close            p  Popen   java -Xmx256m -jar bin HelloWorld jar   cwd r  home karen sphinx4-1 0beta5-src sphinx4-1 0beta5   stdout PIPE  shell True  bufsize  4024          q   Queue           t   threading Thread target enqueue output  args  p stdout  q            t   Thread target enqueue output  args  p stdout  q           t daemon   True   thread dies with the program         t start          do other things here         def myfunc q               while True                   try  line   q get nowait              or q get timeout  1                  except Empty                      print  Vacio                   else    got line           do something with line                      print line             thread   threading Thread target myfunc  args  q            thread start     This part of code is reading from a program s stdout When i execute  myfunc out of the thread it works   But when i execute it in the thread fais     Any suggestion

User · Answer

It s worth trying faulthandler to identify the line or the library that is causing the issue as mentioned here https   stackoverflow com a 58825725 2160809 and in the comments by Karuhanga  faulthandler enable      bad code goes here   or     python3 -q -X faulthandler  gt  gt  gt      bad cod goes here

User · Answer

Segmentation fault  core dumped   is the string that Linux prints when a program exits with a SIGSEGV signal and you have core creation enabled  This means some program has crashed   If you re actually getting this error from running Python  this means the Python interpreter has crashed  There are only a few reasons this can happen    You re using a third-party extension module written in C  and that extension module has crashed  You re  directly or indirectly  using the built-in module ctypes  and calling external code that crashes  There s something wrong with your Python installation  You ve discovered a bug in Python that you should report    The first is by far the most common  If your q is an instance of some object from some third-party extension module  you may want to look at the documentation    Often  when C modules crash  it s because you re doing something which is invalid  or at least uncommon and untested  But whether it s your  fault  in that sense or not - that doesn t matter  The module should raise a Python exception that you can debug  instead of crashing  So  you should probably report a bug to whoever wrote the extension  But meanwhile  rather than waiting 6 months for the bug to be fixed and a new version to come out  you need to figure out what you did that triggered the crash  and whether there s some different way to do what you want  Or switch to a different library   On the other hand  since you re reading and printing out data from somewhere else  it s possible that your Python interpreter just read the line  Segmentation fault  core dumped   and faithfully printed what it read  In that case  some other program upstream presumably crashed   It s even possible that nobody crashed   if you fetched this page from the web and printed it out  you d get that same line  right   In your case  based on your comment  it s probably the Java program that crashed   If you re not sure which case it is  and don t want to learn how to do process management  core-file inspection  or C-level debugging today   there s an easy way to test  After print line add a line saying print  And I m OK   If you see that after the Segmentation fault line  then Python didn t crash  someone else did  If you don t see it  then it s probably Python that s crashed

User · Answer

In my case  I forgot to activate virtualenv  I installed  pip install example  in the wrong virtualenv

User · Answer

In my case I imported pyxlsd module before module wich works with db Mysql   After I did put Mysql module first upper in code  it became to work like a clock  Think there was some namespace issue

User · Answer

There is one more reason for such failure which I came to know when mine failed  You might be working with a lot of data and your RAM is full  This might not apply in this case but it also throws the same error and since this question comes up on top for this error  I have added this answer here

[python] Error: Segmentation fault (core dumped)

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