[Bug 985852] Re: libapt-pkg regression: infinite loop on processing certain Pre-Depends
Michael Vogt
michael.vogt at ubuntu.com
Fri Apr 20 07:33:56 UTC 2012
** Changed in: apt (Ubuntu)
Status: New => In Progress
** Changed in: apt (Ubuntu)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/985852
Title:
libapt-pkg regression: infinite loop on processing certain Pre-Depends
Status in “apt” package in Ubuntu:
In Progress
Bug description:
Summary: a typo in apt-pkg/packagemanager.cc means that certain Pre-
Depends cannot be processed, causing libapt-pkg to hang.
Details: I have a custom package whose control file contains
Pre-Depends: grub-pc | grub
When I attempt to install this on a system which has grub installed already but not grub-pc, apt-get hangs indefinitely, in an infinite loop inside pkgPackageManager::SmartUnPack.
This situation, in which one of the pre-depends is already installed,
should be handled in the block starting at apt-
pkg/packagemanager.cc:612 ("Look for easy targets: packages that are
already okay"). However this fails to inspect anything but the first
pre-depend option as line 615 refers to Start rather than Cur
(repeatedly looking at the first package in the iterator, not the
current value of the iterator).
The error has been replicated a few lines further down, which means
the subsequent code also fails to resolve the situation (e.g. in the
case that the second pre-depend is simultaneously being installed
explicitly).
I attach a debdiff.
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