Segmentation Fault in dnsmasq

[brianewell]

Getting a segmentation fault from dnsmasq as distributed through the package manager on the following:

"Live Image": "20130321T213641Z",
"CPU Type": "AMD Turion(tm) II Neo N54L Dual-Core Processor"

I would post the core dump, but I doubt that's what github had in mind when it comes to an "image".

[rmustacc]

dnsmasq comes from pkgsrc. So it'd really help if you told us what dataset you're on, and either steps to reproduce this or access to the core file will be necessary. Without any additional debugging information there isn't much we can do.

[brianewell]

Sure. Dataset is smartos 1.9.1 base64 (cf7e2f40-9276-11e2-af9a-0bad2233fb0b)
dnsmasq version as reported by pkgin is 2.64
Steps to reproduce are:

pkgin in dnsmasq
svcadm enable dnsmasq:default

checking the log reports "Method "start" failed due to signal SEGV.", and manually running /opt/local/sbin/dnsmasq gives the segmentation fault. How would you like me to deliver this core dump?

[brianewell]

posted for the weekend at: http://brianewell.com/smartos/dnsmasq-2.64-core.bz2

[AlainODea]

I had the exact same issue. It also occurs in a 32-bit base (60ed3a3e-92c7-11e2-ba4a-9b6d5feaa0c4) image.

less $(svcs -L dnsmasq) shows:

[ Mar 28 12:07:18 Disabled. ]
[ Mar 28 12:07:18 Rereading configuration. ]
[ Mar 28 12:08:05 Enabled. ]
[ Mar 28 12:08:05 Executing start method ("/opt/local/sbin/dnsmasq -C /opt/local/etc/dnsmasq.conf"). ]

dnsmasq: cannot open or create lease file /var/cache/dnsmasq.leases: No such file or directory
[ Mar 28 12:08:05 Method "start" exited with status 3. ]
[ Mar 28 12:08:05 Executing start method ("/opt/local/sbin/dnsmasq -C /opt/local/etc/dnsmasq.conf"). ]

dnsmasq: cannot open or create lease file /var/cache/dnsmasq.leases: No such file or directory
[ Mar 28 12:08:05 Method "start" exited with status 3. ]
[ Mar 28 12:08:05 Executing start method ("/opt/local/sbin/dnsmasq -C /opt/local/etc/dnsmasq.conf"). ]

dnsmasq: cannot open or create lease file /var/cache/dnsmasq.leases: No such file or directory
[ Mar 28 12:08:05 Method "start" exited with status 3. ]
[ Mar 28 12:14:32 Leaving maintenance because clear requested. ]
[ Mar 28 12:14:32 Enabled. ]
[ Mar 28 12:14:32 Executing start method ("/opt/local/sbin/dnsmasq -C /opt/local/etc/dnsmasq.conf"). ]
[ Mar 28 12:14:32 Method "start" failed due to signal SEGV. ]
[ Mar 28 12:14:47 Leaving maintenance because clear requested. ]
[ Mar 28 12:14:47 Enabled. ]
[ Mar 28 12:14:47 Executing start method ("/opt/local/sbin/dnsmasq -C /opt/local/etc/dnsmasq.conf"). ]
[ Mar 28 12:14:47 Method "start" failed due to signal SEGV. ]

Here is my /opt/local/etc/dnsmasq.conf:

dhcp-match=ipxe,175
dhcp-range=10.102.0.100,10.102.0.200
dhcp-boot=net:#ipxe,undionly.kkpxe.0
dhcp-boot=smartos.ipxe

Just running /opt/local/sbin/dnsmasq dies with Segmentation Fault (core dumped).

I will try with a default dnsmasq configuration and report back.

[brianewell]

I found the behavior was the same with a modified or stock config

[AlainODea]

@brian-ewell thanks. That's good to know :)

[brianewell]

Attempted to compile this package from source (dnsmasq-2.65) and got another core dump

[jperkin]

I have found the bug, and will update the packages.

[AlainODea]

Thank you Jonathan :)

On 2013-04-04, at 9:54, Jonathan Perkin notifications@github.com wrote:

I have found the bug, and will update the packages.

—
Reply to this email directly or view it on GitHub.

[brianewell]

Thank you! I know this is probably a fringe package for this distribution, thanks for being on top of fixing it. Let me know when it's up and I'll close the issue after testing.

[brianewell]

Have been in conversation with the author or dnsmasq, he brought up this: http://www.thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=71c73ac17c7d0908621ef031d82f8e8bc44933d2

[jperkin]

Yeh, I came up with an independent fix and then found that when trying to submit it upstream. I've taken that patch as well as a follow-up change as per http://mail-index.netbsd.org/pkgsrc-changes/2013/04/04/msg087160.html

[jperkin]

This is now starting to appear in repositories, and should be in all of them within the next few hours. The version you are looking for is dnsmasq-2.64nb1.