Public bug reported:
We tried to implement a function returning an Acquire object "fetcher".
Whenever we called "fetcher.run()" after generating the object using
this function our program crashed with "*** Error in `/usr/bin/python':
double free or corruption (fasttop): ...... ***.
You can reproduce this with the attached example code ("func=1"); the
package to download must not be in the local archive. When you set
"func=0" in this example the code works as expected.
Our researches indicate that Acquire.run() seems to depend on data
structures (memory) of the PackageManager object "pm". In
"pm.get_archives(fetcher, ...)" the "fetcher" object stores pointers to
data structures owned by PackageManager object "pm". This data
structures (filenames) are needed for "fetcher.run()". But in the case
"func=1" the PackageManager pm object is automatically freed by Python
as soon as function "initFetcher(progress)" is left. Therefore the
pointers stored in Acquire object "fetcher" are no longer valid.
# lsb_release -rd
Description: Ubuntu 14.04.5 LTS
Release: 14.04
python-apt 0.9.3.5ubuntu2 amd64
** Affects: python-apt (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "acquire-2.py"
https://bugs.launchpad.net/bugs/1701570/+attachment/4906676/+files/acquire-2.py
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https://bugs.launchpad.net/bugs/1701570
Title:
Acquire.run(): crash with "double free or corruption"
Status in python-apt package in Ubuntu:
New
Bug description:
We tried to implement a function returning an Acquire object
"fetcher". Whenever we called "fetcher.run()" after generating the
object using this function our program crashed with "*** Error in
`/usr/bin/python': double free or corruption (fasttop): ...... ***.
You can reproduce this with the attached example code ("func=1"); the
package to download must not be in the local archive. When you set
"func=0" in this example the code works as expected.
Our researches indicate that Acquire.run() seems to depend on data
structures (memory) of the PackageManager object "pm". In
"pm.get_archives(fetcher, ...)" the "fetcher" object stores pointers
to data structures owned by PackageManager object "pm". This data
structures (filenames) are needed for "fetcher.run()". But in the case
"func=1" the PackageManager pm object is automatically freed by Python
as soon as function "initFetcher(progress)" is left. Therefore the
pointers stored in Acquire object "fetcher" are no longer valid.
# lsb_release -rd
Description: Ubuntu 14.04.5 LTS
Release: 14.04
python-apt 0.9.3.5ubuntu2 amd64
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https://bugs.launchpad.net/ubuntu/+source/python-apt/+bug/1701570/+subscriptions
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