[Bug 1671952] Re: python program gets segmentation fault

[Kevin O'Gorman]

I don't think I can do that.  All signs point to a problem that is directly
related to the size of the journal.  You don't want my 100GB database, and
I don't want to fool around finding a script that creates one from scratch
hoping it will trigger the same problem.  If you can't work from a core
dump, it's going to be hard to solve this.

On Tue, Oct 10, 2017 at 4:20 AM, Serhiy Storchaka <
1671952 at bugs.launchpad.net> wrote:

> Please file a bug on the Python bug tracker (https://bugs.python.org/)
> and provide a minimal script that reproduces a crash.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1671952
>
> Title:
>   python program gets segmentation fault
>
> Status in python3-defaults package in Ubuntu:
>   New
>
> Bug description:
>   Running a Python 3 / sqlite3 script that develops a database
>   representing a game tree, a segmentation fault occurred.
>
>   The program had written 4,910,495 lines of output when it crashed,
> redirected to a file.  It
>   appears normal, and its size is about right for the job being
> performed.  There's nothing
>   suspicious at the end.
>
>   This is a hobby project, so I can share the entire database and any of
> the code you need, but much of it is included in the screen-scraped console
> session attached herewith.  In particular:
>   - the command-line
>   - a gdb stack backtrace of the core dump
>   - the program being run
>   - a run of the sqlite3 "pragma integrity_check" that shows the database
> is sound
>   - database .schema output
>
>   CPU is Core i-7, 32 GB RAM.
>   Code is recursive, but limited by the nature of the problem and
> parameters to depth of about 10 calls.  Code has been used before, albeit
> on a problem with smaller recursive depth and shorter
>   expected run-time.
>   db is 18GB on a 12TB RAID partition; plenty of space
>   kernel is X86-64 4.4.0-66-generic un-fooled-around-with
>   Python and the sqlite3 package is 3.5.2, straight from the repositories
>
>   I have a backup of the database right after this crash (being
>   performed as I write this)
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 16.04
>   Package: python3 3.5.1-3
>   ProcVersionSignature: Ubuntu 4.4.0-66.87-generic 4.4.44
>   Uname: Linux 4.4.0-66-generic x86_64
>   NonfreeKernelModules: wl
>   ApportVersion: 2.20.1-0ubuntu2.5
>   Architecture: amd64
>   CurrentDesktop: XFCE
>   Date: Fri Mar 10 13:47:54 2017
>   InstallationDate: Installed on 2016-08-08 (214 days ago)
>   InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64
> (20160719)
>   SourcePackage: python3-defaults
>   UpgradeStatus: No upgrade log present (probably fresh install)
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/python3-defaults/+bug/1671952/+
> subscriptions
>


-- 
Kevin O'Gorman
#define QUESTION ((bb) || (!bb))   /* Shakespeare */

Please consider the environment before printing this email.


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https://bugs.launchpad.net/bugs/1671952

Title:
  python program gets segmentation fault

Status in python3-defaults package in Ubuntu:
  New

Bug description:
  Running a Python 3 / sqlite3 script that develops a database
  representing a game tree, a segmentation fault occurred.

  The program had written 4,910,495 lines of output when it crashed, redirected to a file.  It
  appears normal, and its size is about right for the job being performed.  There's nothing
  suspicious at the end.

  This is a hobby project, so I can share the entire database and any of the code you need, but much of it is included in the screen-scraped console session attached herewith.  In particular:
  - the command-line
  - a gdb stack backtrace of the core dump
  - the program being run
  - a run of the sqlite3 "pragma integrity_check" that shows the database is sound
  - database .schema output

  CPU is Core i-7, 32 GB RAM.  
  Code is recursive, but limited by the nature of the problem and parameters to depth of about 10 calls.  Code has been used before, albeit on a problem with smaller recursive depth and shorter
  expected run-time. 
  db is 18GB on a 12TB RAID partition; plenty of space
  kernel is X86-64 4.4.0-66-generic un-fooled-around-with
  Python and the sqlite3 package is 3.5.2, straight from the repositories

  I have a backup of the database right after this crash (being
  performed as I write this)

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: python3 3.5.1-3
  ProcVersionSignature: Ubuntu 4.4.0-66.87-generic 4.4.44
  Uname: Linux 4.4.0-66-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Fri Mar 10 13:47:54 2017
  InstallationDate: Installed on 2016-08-08 (214 days ago)
  InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  SourcePackage: python3-defaults
  UpgradeStatus: No upgrade log present (probably fresh install)

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