[Kea-users] DHCP-DDNS server repeatedly logging "Resource temporarily unavailable"

[Derek Lambert]

Reported config installed from Fedora repo:

 C++ Compiler:
   CXX:             g++
   CXX_VERSION:     g++ (GCC) 5.3.1 20151207 (Red Hat 5.3.1-2)
   DEFS:            -DHAVE_CONFIG_H
   CPPFLAGS:         -DOS_LINUX  -I$(top_srcdir)/ext/coroutine
-DBOOST_ASIO_HEADER_ONLY -DBOOST_ASIO_DISABLE_THREADS=1
-DBOOST_ERROR_CODE_HEADER_ONLY -DBOOST_SYSTEM_NO_DEPRECATED
   CXXFLAGS:        -O2 -g -pipe -Wall -Werror=format-security
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong
--param=ssp-buffer-size=4 -grecord-gcc-switches
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic
   LDFLAGS:         -Wl,-z,relro
-specs=/usr/lib/rpm/redhat/redhat-hardened-ld -lpthread
   KEA_CXXFLAGS:     -Wall -Wextra -Wnon-virtual-dtor -Wwrite-strings
-Woverloaded-virtual -Wno-sign-compare -pthread -Werror -fPIC

I rebuilt the package disabling optimizations (also had to remove the
D_FORTIFY_SOURCE define) and the DDNS server starts up without issue now.
Haven't tested functionality but the process is listening on udp/53001 and
CPU usage is normal.

 C++ Compiler:
   CXX:             g++
   CXX_VERSION:     g++ (GCC) 5.3.1 20151207 (Red Hat 5.3.1-2)
   DEFS:            -DHAVE_CONFIG_H
   CPPFLAGS:         -DOS_LINUX  -I$(top_srcdir)/ext/coroutine
-DBOOST_ASIO_HEADER_ONLY -DBOOST_ASIO_DISABLE_THREADS=1
-DBOOST_ERROR_CODE_HEADER_ONLY -DBOOST_SYSTEM_NO_DEPRECATED
   CXXFLAGS:        -O0 -g -pipe -Wall -Werror=format-security -fexceptions
-fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic
   LDFLAGS:         -Wl,-z,relro
-specs=/usr/lib/rpm/redhat/redhat-hardened-ld -lpthread
   KEA_CXXFLAGS:     -Wall -Wextra -Wnon-virtual-dtor -Wwrite-strings
-Woverloaded-virtual -Wno-sign-compare -pthread -Werror -fPIC

Thanks for the tip! This will at least allow me to move forward with my
testing.

Derek

On Thu, Feb 4, 2016 at 11:09 AM, Tomek Mrugalski <tomasz at isc.org> wrote:

> On 04/02/16 14:48, Derek Lambert wrote:
> > On Fedora 23 running Kea 1.0.0-1.fc23 x86_64 installed from Fedora repo.
> >
> > When the DHCP-DDNS server is started it repeatedly logs "Resource
> > temporarily unavailable" errors:
> We heard about this issue, but were unable to find a root cause so far.
>
> Can you check which compiler and which version was used to compile Kea?
> Was it gcc-5?
>
> Also, this may be a long shot, but can you recompile Kea with -o0? We
> observed an issue in one unit-test in DDNS that also complained about
> resources being temporarily unavailable. We haven't had time to get
> round to it, but the workaround that works for the unit-test is to
> disable compiler optimizations.
>
> Obviously, this is not a solution, but it may give us more info to help
> rootcausing the actual issue.
>
> Tomek
>
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> Kea-users at lists.isc.org
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>
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