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Bug#165448: marked as done ([libapt-pkg] apt-get segfaults on corrupt /var/cache/apt/*.bin)

Your message dated Fri, 19 Aug 2011 12:05:22 +0200
with message-id <20110819115258.GA4040@debian.org>
and subject line Re: Bug#81829: "Segmentation faulty tree" (#270147) still present in Lenny, broken /var/cache/apt/*.bin available for download
has caused the Debian Bug report #81829,
regarding [libapt-pkg] apt-get segfaults on corrupt /var/cache/apt/*.bin
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
81829: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=81829
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: apt
Version: 0.5.4
Severity: serious

When I invoke apt-get to install a new package, it crashes : 
root@p204:/home/jumper# apt-get install xawtv
zsh: segmentation fault  apt-get install xawtv

here is the gdb output :
root@p204:/home/jumper#  gdb apt-get
GNU gdb 2002-08-18-cvs
Copyright 2002 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you
are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for
details.
This GDB was configured as "i386-linux"...(no debugging symbols
found)...
(gdb) run install xawtv
Starting program: /usr/bin/apt-get install xawtv
(no debugging symbols found)...(no debugging symbols found)...(no
debugging symbols found)...(no debugging symbols found)...
(no debugging symbols found)...
Program received signal SIGSEGV, Segmentation fault.
0x400c5b52 in debPackagesIndex::FindInCache () from
/usr/lib/libapt-pkg-libc6.2-3-2.so.3.2
(gdb) bt
#0  0x400c5b52 in debPackagesIndex::FindInCache () from
/usr/lib/libapt-pkg-libc6.2-3-2.so.3.2
#1  0x4009eb79 in pkgCacheGenerator::WriteUniqString () from
/usr/lib/libapt-pkg-libc6.2-3-2.so.3.2
#2  0x4009fdec in pkgMakeStatusCache () from
/usr/lib/libapt-pkg-libc6.2-3-2.so.3.2
#3  0x40095825 in pkgCacheFile::Open () from
/usr/lib/libapt-pkg-libc6.2-3-2.so.3.2
#4  0x080581ab in strcpy ()
#5  0x4006431a in CommandLine::DispatchArg () from
/usr/lib/libapt-pkg-libc6.2-3-2.so.3.2
#6  0x08063610 in strcpy ()
#7  0x4017a9d3 in __libc_start_main () from /lib/libc.so.6

I am using a debian unstable, kernel 2.4.19 and libc6 2.3.1-1

My regards,
Guillaume

-- 
- Guillaume Membré
- Elève ingénieur à l'école des Mines de Nantes
- Web site : http://collection.photo.free.fr/

--- End Message ---
--- Begin Message --- 
Source: apt
Source-Version: 0.8.16~exp4

apt (0.8.16~exp4) experimental; urgency=low

   [ Julian Andres Klode ]
   * apt-pkg/pkgcache.h:
     - [ABI break] Add pkgCache::Header::CacheFileSize, storing the cache size
   * apt-pkg/pkgcachegen.cc:
     - Write the file size to the cache
   * apt-pkg/pkgcache.cc:
     - Check that cache is at least CacheFileSize bytes large (LP: #16467)

On Thu, Aug 18, 2011 at 04:16:05PM -0500, Jonathan Nieder wrote:
> tags 81829 - moreinfo
> quit
> 
> Axel Beckert wrote:
> 
> > I occasionally ran into this bug on Lenny, can't remember on which
> > platform, but never deterministically.
> >
> > But today I reproducibly ran into this bug with both, apt-get and
> > aptitude. Independent of what I did: aptitude; aptitude -u; aptitude
> > upgrade; apt-get upgrade, I always get the "Segmentation faulty
> > tree... 50%" ("Building dependency tree... 50%^MSegmentation fault").
> >
> > Moving /var/lib/apt/extended_states away didn't help.
> >
> > Couldn't even do an apt-get install gdb for generating a backtrace.
> >
> > Moving away pkgcache.bin and srcpkgcache.bin from /var/cache/apt/
> > finally did help (thanks to waldi for that hint), but copying them
> > back after upgrading two packages didn't reproduce the segfault --
> > they always got recreated.
> 
> Thanks!  No promises about being able to take a look soon, but I've
> downloaded them.
I closed the Launchpad bug in 0.8.16~exp4, but forgot to close that 
one. We still cannot detect invalid caches where data changes, but we
can now detect all truncated caches, and reject them.

I could have included a CRC checksum in the header of the remaining
cache, but our experience so far is that 

 (a) most (all?) of these bugs are the result of truncated cache files
 (b) checksumming the cache on opening is much slower than we want,
     especially on ARM systems (200 ms on abel.d.o, 500 ms on an N900,
     12 ms on my Intel Core i5)

That said, if future shows us cases where there are problems with
correctly-sized caches, we can still add a checksum when we break
ABI again, and enable it by default only on amd64 and other fast
architectures.

-- 
Julian Andres Klode  - Debian Developer, Ubuntu Member

See http://wiki.debian.org/JulianAndresKlode and http://jak-linux.org/.

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