Segmentation Fault

[Pablo Catalina]

Binary package hint: netstat-nat

The binary of netstat-nat crash when ejecute.

The last version solves the problem.

[Vassilis Pandis (pandisv)]

Can you please be a bit more descriptive? Which version do you have, and which version fixes the problem? Are you on x86? Can you also please try to get a backtrace of the crash (see http://wiki.ubuntu.com/DebuggingProgramCrash for more information on how to do this). Thanks in advance.

[Pablo Catalina (xkill)]

[...]
old_mmap(NULL, 40680, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4, 0) = 0xb7e20000
old_mmap(0xb7e29000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0x8000) = 0xb7e29000
close(4) = 0
munmap(0xb7e2a000, 18279) = 0
open("/etc/protocols", O_RDONLY) = 4
fcntl64(4, F_GETFD) = 0
fcntl64(4, F_SETFD, FD_CLOEXEC) = 0
fstat64(4, {st_mode=S_IFREG|0644, st_size=2478, ...}) = 0
mmap2(NULL, 131072, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7e00000
read(4, "# Internet (IP) protocols\n#\n# Up"..., 131072) = 2478
close(4) = 0
munmap(0xb7e00000, 131072) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++

If the nat table is empty the program crash becouse it try to map into mem nothing. It's a know bug, and it is solved in the last version as the autor of nestat-nat said in the changelog:

Changelog:
--------------------------------------------------------------------------------
version: 1.4.7
- fix for read-in (ip_conntrack), previous versions could sometimes hang or
  segfault on some systems.
- fix for displaying dnat over snat connections.
- changed my email to <email address hidden> and changed homepage url

[jcfp (jcfp)]

Still exists in feisty (with netstat-nat 1.4.5-2)

[Oibaf (oibaf)]

This bug should be fixed in 1.4.7 and Ubuntu 8.04 ships 1.4.8.