[Dnsmasq-discuss] dnsmasq rc5 segfault
carlos at fisica.ufpr.br
Sat Jul 12 00:11:34 BST 2008
Simon Kelley (simon at thekelleys.org.uk) wrote on 11 July 2008 19:40:
>Carlos Carvalho wrote:
>> Today dnsmasq died. It was the first time since I use it :-(
>> In its log there's no sign of problems. The last entry is for a
>> DHCPNAK; it's the only such record with 2.43. The kernel log says
>> Jul 11 14:27:38 hoggar dnsmasq: segfault at 10 ip 08061e91 sp bfffe770 error 4 in dnsmasq[8048000+22000]
>> The kernel is compiled with several PAX protections, in particular
>> non-executable pages.
>> Any ideas on how to debug this? All I can imagine demand a significant
>> amount of work here :-(
>Best bet is to be ready to catch the next one.
>1) rebuild dnsmasq with
>2) enable coredumps and move to a directory where they can be written
>ulimit -c unlimited
>3) run dnsmasq in the foreground
D... ops, sorry, I can't run a segfaulting program as root in the
central server of the department...
I ran it normally and sent it a quit signal but it didn't produce a
core; it works for other programs. I changed the chdir / in dnsmasq.c
to "/tmp" to no avail (it does the chdir). Why doesn't it produce a core?
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