05-21-2014
He's not getting SIGILL, he's getting SIGSEGV, at the address 0x201138F4. Given the brk() values posted right before that SIGSEGV, that looks like someone's overrunning his heap - by exactly 512 MB.
A couple of other issues, too:
1. Use of MAP_NORESERVE in mmap() calls.
Why? So if your process does get swapped out, you crash when swapped back in? If you're lucky, because else you run with corrupt data. Or your process crashes when swap space runs out....
2. open("", O_RDWR|O_CREAT) Err #2 ENOENT
Is this error properly handled? It looks like open() is being passed an empty string.
3. mmap() of the calling binary (./tcpserver).
What in the world is this thing doing, mmap()'ing itself read/write for the first 1080 bytes of the binary executable? I wouldn't doubt getting a SIGILL after *that*.
Last edited by achenle; 05-21-2014 at 11:35 PM..
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LEARN ABOUT DEBIAN
dose-challenged
CHALLENGED(1) DOSE Tools CHALLENGED(1)
NAME
dose-challenged - detect broken packages due to obsolete dependencies
SYNOPSIS
dose-challenged [options] Packages file(s)
DESCRIPTION
dose-challenged performs a speculative analysis of the repository to identify those packages that, if upgraded to a specific version, would
break a large number of other packages in the repository. This tool would be particularly useful during the upgrade of a specific component
to evaluate its impact on the software archive.
Input Specification
The input of dose-challenged is a list of Debian Packages files
Output Specification
The output of dose-challenged is in the yaml format.
Options
-b --broken
Print the list of broken packages
-d --downgrade
Check package downgrades
-c Print the list of packages in a cluster
--checkonly
Select a subset of packages to check. By default all packages are checked.
-v Enable info / warnings / debug messages. This option may be repeated up to three times in order to increase verbosity.
--progress
Enable progress bars.
-h, --help
Display this list of options.
EXAMPLE
dose-challenged -v --progress Packages.bz2 > result.yaml
NOTE
AUTHOR
Pietro Abate and Roberto Di Cosmo
SEE ALSO
dose-distcheck(1) dose-outdated(1)
<http://www.mancoosi.org> is the home page of the Mancoosi project.
dose3 3.0.2 2012-10-03 CHALLENGED(1)