Issue #8320 has been reported by crondaemon (Dario Lombardo).

----------------------------------------
Bug #8320: Ruby interpreter crashes when running pcaprub
https://bugs.ruby-lang.org/issues/8320

Author: crondaemon (Dario Lombardo)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.0.0dev (2012-11-01 trunk 37411) [i686-linux]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


Here's the code (taken from examples) that caused the crash:

require 'rubygems'
require 'pcaprub'

capture = PCAPRUB::Pcap.open_live('eth0', 65535, true, 0)
capture.setfilter('icmp')
capture.each do |packet|
  puts capture.dump(packet.length, packet.length, packet)
end

The code was run with

gem install pcaprub
rvmsudo ruby testpcaprub.rb

Ruby was installed with rvm. Code causes crash with:

ruby 2.0.0dev (2012-11-01 trunk 37411) [i686-linux]
ruby 1.9.3p286 (2012-10-12 revision 37165) [i686-linux]
ruby 1.8.7 (2012-10-12 patchlevel 371) [i686-linux]

The expected behavior from the code was to print the captured packets (don't know exactly how, since this was my first test).

Crash dump:

$ rvmsudo ruby testpcaprub.rb 
testpcaprub.rb:10: [BUG] Segmentation fault
ruby 2.0.0dev (2012-11-01 trunk 37411) [i686-linux]

-- Control frame information -----------------------------------------------
c:0005 p:---- s:0018 e:000017 CFUNC  :dump
c:0004 p:0021 s:0012 e:000010 BLOCK  testpcaprub.rb:10 [FINISH]
c:0003 p:---- s:0008 e:000007 CFUNC  :?>	
c:0002 p:0057 s:0005 e:001d40 EVAL   testpcaprub.rb:9 [FINISH]
c:0001 p:0000 s:0002 e:00137c TOP    [FINISH]

testpcaprub.rb:9:in `<main>'
testpcaprub.rb:9:in `?C	'
testpcaprub.rb:10:in `block in <main>'
testpcaprub.rb:10:in `dump'

-- C level backtrace information -------------------------------------------
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(+0x18f603) [0xb7619603] vm_dump.c:644
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(+0x54f5b) [0xb74def5b] vfscanf.c:1965
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(rb_bug+0x44) [0xb74dfef4] ../sysdeps/posix/tempname.c:227
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(+0x118c54) [0xb75a2c54] des_impl.c:430
[0xb76ec40c]
/lib/i386-linux-gnu/libc.so.6(fwrite+0x35) [0xb7323775] iofwrite.c:41
/usr/lib/i386-linux-gnu/libpcap.so.0.8(pcap_dump+0x5d) [0xb6f68d5d] regexec.c:3465
/home/dario/.rvm/gems/ruby-2.0.0-preview1/gems/pcaprub-0.11.3/lib/pcaprub.so(+0x2626) [0xb7480626] pcaprub.c:500
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(+0x176969) [0xb7600969] vm_insnhelper.c:1329
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(+0x179f1a) [0xb7603f1a] vm_insnhelper.c:1442
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(+0x186f39) [0xb7610f39] vm_insnhelper.c:1529
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(+0x17e747) [0xb7608747] insns.def:983
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(+0x183a18) [0xb760da18] vm.c:1153
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(rb_yield+0x1f7) [0xb7613fd7] vm.c:624
/home/dario/.rvm/gems/ruby-2.0.0-preview1/gems/pcaprub-0.11.3/lib/pcaprub.so(+0x1885) [0xb747f885] pcaprub.c:673
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(+0x1768e1) [0xb76008e1] vm_insnhelper.c:1311
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(+0x179f1a) [0xb7603f1a] vm_insnhelper.c:1442
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(+0x186f39) [0xb7610f39] vm_insnhelper.c:1529
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(+0x17e157) [0xb7608157] insns.def:968
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(+0x183a18) [0xb760da18] vm.c:1153
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(rb_iseq_eval_main+0xa2) [0xb7614a12] vm.c:1396
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(+0x59924) [0xb74e3924] vfprintf.c:1465
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(ruby_exec_node+0x24) [0xb74e4744] vfprintf.c:1629
/home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0(ruby_run_node+0x36) [0xb74e6766] vfprintf.c:2280
ruby() [0x8048658]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0xb72d64d3] libc-start.c:226
ruby() [0x8048681]

-- Other runtime information -----------------------------------------------

* Loaded script: testpcaprub.rb

* Loaded features:

    0 enumerator.so
    1 /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/2.0.0/i686-linux/enc/encdb.so
    2 /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/2.0.0/i686-linux/enc/trans/transdb.so
    3 /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/site_ruby/2.0.0/rubygems/defaults.rb
    4 /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/2.0.0/i686-linux/rbconfig.rb
    5 /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/site_ruby/2.0.0/rubygems/deprecate.rb
    6 /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/site_ruby/2.0.0/rubygems/exceptions.rb
    7 /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/site_ruby/2.0.0/rubygems/custom_require.rb
    8 /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/site_ruby/2.0.0/rubygems.rb
    9 /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/site_ruby/2.0.0/rubygems/version.rb
   10 /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/site_ruby/2.0.0/rubygems/requirement.rb
   11 /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/site_ruby/2.0.0/rubygems/platform.rb
   12 /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/site_ruby/2.0.0/rubygems/specification.rb
   13 /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/site_ruby/2.0.0/rubygems/path_support.rb
   14 /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/site_ruby/2.0.0/rubygems/dependency.rb
   15 /home/dario/.rvm/gems/ruby-2.0.0-preview1/gems/pcaprub-0.11.3/lib/pcaprub/common.rb
   16 /home/dario/.rvm/gems/ruby-2.0.0-preview1/gems/pcaprub-0.11.3/lib/pcaprub/version.rb
   17 /home/dario/.rvm/gems/ruby-2.0.0-preview1/gems/pcaprub-0.11.3/lib/pcaprub.so
   18 /home/dario/.rvm/gems/ruby-2.0.0-preview1/gems/pcaprub-0.11.3/lib/pcaprub/ext.rb
   19 /home/dario/.rvm/gems/ruby-2.0.0-preview1/gems/pcaprub-0.11.3/lib/pcaprub.rb

* Process memory map:

08048000-08049000 r-xp 00000000 08:01 13504431   /home/dario/.rvm/rubies/ruby-2.0.0-preview1/bin/ruby
08049000-0804a000 r--p 00000000 08:01 13504431   /home/dario/.rvm/rubies/ruby-2.0.0-preview1/bin/ruby
0804a000-0804b000 rw-p 00001000 08:01 13504431   /home/dario/.rvm/rubies/ruby-2.0.0-preview1/bin/ruby
08fff000-09290000 rw-p 00000000 00:00 0          [heap]
b6b51000-b6b52000 rw-p 00000000 00:00 0 
b6b52000-b6b6e000 r-xp 00000000 08:01 525236     /lib/i386-linux-gnu/libgcc_s.so.1
b6b6e000-b6b6f000 r--p 0001b000 08:01 525236     /lib/i386-linux-gnu/libgcc_s.so.1
b6b6f000-b6b70000 rw-p 0001c000 08:01 525236     /lib/i386-linux-gnu/libgcc_s.so.1
b6b70000-b6f50000 rw-s 00000000 00:07 6428389    socket:[6428389]
b6f50000-b6f84000 r-xp 00000000 08:01 7607152    /usr/lib/i386-linux-gnu/libpcap.so.1.1.1
b6f84000-b6f85000 ---p 00034000 08:01 7607152    /usr/lib/i386-linux-gnu/libpcap.so.1.1.1
b6f85000-b6f86000 r--p 00034000 08:01 7607152    /usr/lib/i386-linux-gnu/libpcap.so.1.1.1
b6f86000-b6f87000 rw-p 00035000 08:01 7607152    /usr/lib/i386-linux-gnu/libpcap.so.1.1.1
b6fab000-b6fad000 r-xp 00000000 08:01 13511690   /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/2.0.0/i686-linux/enc/encdb.so
b6fad000-b6fae000 r--p 00001000 08:01 13511690   /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/2.0.0/i686-linux/enc/encdb.so
b6fae000-b6faf000 rw-p 00002000 08:01 13511690   /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/2.0.0/i686-linux/enc/encdb.so
b6faf000-b6fb0000 ---p 00000000 00:00 0 
b6fb0000-b7034000 rw-p 00000000 00:00 0 
b7034000-b7234000 r--p 00000000 08:01 7609336    /usr/lib/locale/locale-archive
b7234000-b7236000 rw-p 00000000 00:00 0 
b7236000-b7260000 r-xp 00000000 08:01 533185     /lib/i386-linux-gnu/libm-2.15.so
b7260000-b7261000 r--p 00029000 08:01 533185     /lib/i386-linux-gnu/libm-2.15.so
b7261000-b7262000 rw-p 0002a000 08:01 533185     /lib/i386-linux-gnu/libm-2.15.so
b7262000-b726a000 r-xp 00000000 08:01 525257     /lib/i386-linux-gnu/libcrypt-2.15.so
b726a000-b726b000 r--p 00007000 08:01 525257     /lib/i386-linux-gnu/libcrypt-2.15.so
b726b000-b726c000 rw-p 00008000 08:01 525257     /lib/i386-linux-gnu/libcrypt-2.15.so
b726c000-b7293000 rw-p 00000000 00:00 0 
b7293000-b7296000 r-xp 00000000 08:01 533189     /lib/i386-linux-gnu/libdl-2.15.so
b7296000-b7297000 r--p 00002000 08:01 533189     /lib/i386-linux-gnu/libdl-2.15.so
b7297000-b7298000 rw-p 00003000 08:01 533189     /lib/i386-linux-gnu/libdl-2.15.so
b7298000-b729f000 r-xp 00000000 08:01 533181     /lib/i386-linux-gnu/librt-2.15.so
b729f000-b72a0000 r--p 00006000 08:01 533181     /lib/i386-linux-gnu/librt-2.15.so
b72a0000-b72a1000 rw-p 00007000 08:01 533181     /lib/i386-linux-gnu/librt-2.15.so
b72a1000-b72b8000 r-xp 00000000 08:01 533183     /lib/i386-linux-gnu/libpthread-2.15.so
b72b8000-b72b9000 r--p 00016000 08:01 533183     /lib/i386-linux-gnu/libpthread-2.15.so
b72b9000-b72ba000 rw-p 00017000 08:01 533183     /lib/i386-linux-gnu/libpthread-2.15.so
b72ba000-b72bd000 rw-p 00000000 00:00 0 
b72bd000-b7460000 r-xp 00000000 08:01 524409     /lib/i386-linux-gnu/libc-2.15.so
b7460000-b7462000 r--p 001a3000 08:01 524409     /lib/i386-linux-gnu/libc-2.15.so
b7462000-b7463000 rw-p 001a5000 08:01 524409     /lib/i386-linux-gnu/libc-2.15.so
b7463000-b7466000 rw-p 00000000 00:00 0 
b747e000-b7483000 r-xp 00000000 08:01 13514394   /home/dario/.rvm/gems/ruby-2.0.0-preview1/gems/pcaprub-0.11.3/lib/pcaprub.so
b7483000-b7484000 r--p 00004000 08:01 13514394   /home/dario/.rvm/gems/ruby-2.0.0-preview1/gems/pcaprub-0.11.3/lib/pcaprub.so
b7484000-b7485000 rw-p 00005000 08:01 13514394   /home/dario/.rvm/gems/ruby-2.0.0-preview1/gems/pcaprub-0.11.3/lib/pcaprub.so
b7485000-b7487000 r-xp 00000000 08:01 13511697   /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/2.0.0/i686-linux/enc/trans/transdb.so
b7487000-b7488000 r--p 00001000 08:01 13511697   /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/2.0.0/i686-linux/enc/trans/transdb.so
b7488000-b7489000 rw-p 00002000 08:01 13511697   /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/ruby/2.0.0/i686-linux/enc/trans/transdb.so
b7489000-b748a000 r--p 005e0000 08:01 7609336    /usr/lib/locale/locale-archive
b748a000-b76d1000 r-xp 00000000 08:01 13504432   /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0.0
b76d1000-b76d4000 r--p 00246000 08:01 13504432   /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0.0
b76d4000-b76d6000 rw-p 00249000 08:01 13504432   /home/dario/.rvm/rubies/ruby-2.0.0-preview1/lib/libruby.so.2.0.0
b76d6000-b76ec000 rw-p 00000000 00:00 0 
b76ec000-b76ed000 r-xp 00000000 00:00 0          [vdso]
b76ed000-b770d000 r-xp 00000000 08:01 533186     /lib/i386-linux-gnu/ld-2.15.so
b770d000-b770e000 r--p 0001f000 08:01 533186     /lib/i386-linux-gnu/ld-2.15.so
b770e000-b770f000 rw-p 00020000 08:01 533186     /lib/i386-linux-gnu/ld-2.15.so
bfb76000-bfb97000 rw-p 00000000 00:00 0          [stack]


[NOTE]
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html

Dump is more or less the same in 1.9 while in 1.8 I just can see 

testpcaprub.rb:10: [BUG] Segmentation fault




-- 
http://bugs.ruby-lang.org/