dhcpcd-discuss

On Thu, 26 May 2016 00:28:12 +0100
Roy Marples <roy@xxxxxxxxxxxx> wrote:

> On 2016-05-25 23:32, Neal P. Murphy wrote:
> > I'm playing with getting Smoothwall Express to use IPv6. And not
> > getting anywhere very quickly. But that's partly due to my newness to
> > IPv6.
> > 
> > Something is weird.
> > 
> > With 6.10.3 and 6.11.0, any of these lines in the .conf:
> > ----
> > ia_pd 0b:17:f2:7d/::/60 eth0/1 eth2/3
> > ia_pd 0b:17:f2:7d/::0/60 eth0/1 eth2/3
> > ia_pd 0b:17:f2:7d//60 eth0/1 eth2/3
> > ----
> > 
> > causes
> > ----
> > ...
> > DUID 00:01:00:01:1b:ff:1d:50:00:90:0b:17:f2:7d
> > eth0: IAID 0b:17:f2:7a
> > eth2: IAID 0b:17:f2:7c
> > eth3: IAID 0b:17:f2:7d
> > eth3: delaying IPv6 router solicitation for 0.8 seconds
> > eth3: reading lease `/var/db/dhcpcd-eth3.lease6'
> > eth3: soliciting a DHCPv6 lease
> > eth3: delaying SOLICIT6 (xid 0x32dd0d), next in 0.9 seconds
> > eth3: soliciting an IPv6 router
> > *** Error in `dhcpcd': malloc(): memory corruption: 0x09c8fb50 ***
> > ----
> > 
> > And dhcpcd must be killed via 'kill -9 PID'.
> > 
> > Since others seem to use the syntax without trouble, is it
> > possible--or probable--that I'm building dhcpcd wrong?
> > 
> > As to the coredump I mentioned in the subject, *now* I can't reproduce
> > it. I can send the coredump and unstripped binary (for 6.10.3), if
> > desired.
> 
> Yes please.
> The core dump and the binary will tell us where the problem is.
> 
> dhcpcd-6.11.0 did fix some potential memory issues you may have found 
> with dhcpcd-6.10.x which would explain why you cannot replicate it.

Trouble is, I couldn't reproduce the coredump on 6.10.3, either.

Attached is a tarball of several coredumps and unstripped dhcpcd from 6.10.3 and 6.11.0. I think the coredumps are all from 6.10.3. I included the 6.11.0 just in case.

I'm unable to provide coredumps for the memory corruption. I can't get the program to dump core ; neither <CTRL/\> nor SIGSEV work. Is there another way to obtain a process' core? ... Oh, duh. I might be able to gdb the program and get a stack trace that way.

N

Attachment: dhcpcd-prog-core.tar.gz
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