DHCPD 4.1.1-P1 Occasional Segfault

Glenn Satchell glenn.satchell at uniq.com.au
Wed Oct 5 09:36:05 UTC 2016

The root cause is poor code in a very old version.

The simple fix is to run a newer version, I'm sure there are RPMs around
for newer ones that don't have that problem.

I think this might be the bug, fixed around 4.2.0. This is from the
RELNOTES file distributed with the source.

! Two packets were found that cause a server to halt.  The code
  has been updated to properly process or reject the packets as
  appropriate.  Thanks to David Zych at University of Illinois
  for reporting this issue.  [ISC-Bugs #24960]
  One CVE number for each class of packet.

But if you're going to patch the code and recompile, just go to the newer


On Wed, October 5, 2016 7:28 am, Norman Elton wrote:
> We are running RHEL6's version of ISC dhcpd (based on 4.1.1-p1). Every
> few months, one of our servers mysteriously segfaults:
> dhcpd[30744]: segfault at 7f3ff02712c8 ip 00007f3ff02712c8 sp
> 00007ffe16d0eb58 error 15 in libc-2.12.so[7f3ff0271000+2000]
> What is the recommended way to begin finding a root cause?
> Thanks!
> Norman Elton
> College of William & Mary
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> dhcp-users mailing list
> dhcp-users at lists.isc.org
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