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Re: [libnet-pcap-perl] Fwknop fails with a segmentation fault on i386

Franck Joncourt wrote:


Hi,


Hello,


Maintaining fwknop, I have the following bug:
I am the upstream maintainer of both the Net::Pcap and Net::RawIP modules. 


http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=508432

I managed with upstream to track down the problem to the
libnet-pcap-perl module (0.16-1).

I have saved a typescript file[1] that shows how to reproduce the
problem leading to:

[quote="syslog"]
Jan 12 19:47:43 diamond kernel: [822901.361529] fwknopd[30660] general
protection ip:f7e626c9 sp:ff9988b0 error:0 in libc-2.7.so[f7df6000 +138000] 
[/quote]
I don't see anything in the typescript you pointed that would indicate an error. Also, I note that in this case, you were using Net::Pcap 0.05 


Here is a short explanation about what is done:

  1/ Setup the chroot (i386 only) and install some required packages
2/ Install fwknop with upstream tarball through the install.pl script. The Net::Pcap (0.05) perl module is bundled in the tarball as other 
     perl modules.
  2/ Run the test suite ; it works fine.
  3/ Remove the Pcap.pm file (0.05)
  4/ Install libnet-pcap-perl (0.16-1)
  5/ Run the test suite ; it fails with a segmentation fault.
Did you try with compiling your own version of Net::Pcap? (I doubt this would be the source of the problem, but you never know) Also, do you have a backtrace of the segfault? 


This bug makes fwknop unusable on i386 systems.
Does this problem only happen on Debian i386 systems or can it be reproduced on other systems/architecture? (I'm using OSX/PowerPC). 


--
Sébastien Aperghis-Tramoni

Close the world, txEn eht nepO.
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