[Kea-users] kea 1.2 - "One or more hook libraries failed to load"

[Jason Lixfeld]

I tend to fumble around debugging stuff like this, so forgive me if I’m not doing what you ask; I really have no idea how :)

What I was able to piece together was starting up with LD_DEBUG=all :

root at build:/var/log/kea# LD_DEBUG=all /usr/local/sbin/kea-dhcp4 -c /usr/local/etc/kea/kea.conf -d &> kea2.log

Chopping through that log file, I found this:

2017-09-06 07:33:28.874 ERROR [kea-dhcp4.hooks/46864] HOOKS_LOAD_ERROR 'load' function in hook library /usr/local/lib/hooks/libdhcp_flex_id.so returned error 1

Following that back up the logfile I found this:

2017-09-06 07:33:28.874 ERROR [kea-dhcp4.flex-id/46864] FLEX_ID_EXPRESSION_NOT_DEFINED Expression (identifier-expression) is not defined.

And following that back up further still, I found this:

/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: subnet4_select (fatal)

So then I pulled out anything related to that particular error for the flex_id library:

root at build:/var/log/kea# grep "/usr/local/lib/hooks/libdhcp_flex_id.so: error:" kea2.log
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: buffer4_receive (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: buffer4_send (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: context_create (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: context_destroy (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: control_command_receive (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: lease4_decline (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: lease4_expire (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: lease4_recover (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: lease4_release (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: lease4_renew (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: lease4_select (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: lease6_expire (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: lease6_rebind (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: lease6_recover (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: lease6_renew (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: lease6_select (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: pkt4_receive (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: pkt4_send (fatal)
     46864:	/usr/local/lib/hooks/libdhcp_flex_id.so: error: symbol lookup error: undefined symbol: subnet4_select (fatal)

What confuses me though, is that by cherry picking the first undefined symbol itself from the log file, it appears to be there, so I’m not sure why it’s not able to look it up:

root at build:/var/log/kea# grep buffer4_receive kea2.log
     46864:	symbol=buffer4_receive;  lookup in file=/usr/local/lib/hooks/libdhcp_flex_id.so [0]
     46864:	symbol=buffer4_receive;  lookup in file=/usr/local/lib/libkea-dhcp++.so.5 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/usr/local/lib/libkea-asiolink.so.4 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/usr/local/lib/libkea-dns++.so.0 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/usr/local/lib/libkea-cc.so.2 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/usr/local/lib/libkea-hooks.so.3 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/usr/local/lib/libkea-log.so.3 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/usr/local/lib/libkea-eval.so.5 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/usr/local/lib/libkea-threads.so.1 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/usr/local/lib/libkea-util.so.2 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/usr/local/lib/libkea-exceptions.so.0 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/lib/x86_64-linux-gnu/libgcc_s.so.1 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/lib/x86_64-linux-gnu/libpthread.so.0 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/lib/x86_64-linux-gnu/libc.so.6 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/usr/local/lib/libkea-cryptolink.so.2 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/usr/lib/x86_64-linux-gnu/libcrypto.so.1.1 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/lib/x86_64-linux-gnu/libdl.so.2 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/usr/lib/x86_64-linux-gnu/libstdc++.so.6 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/lib/x86_64-linux-gnu/libm.so.6 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/usr/lib/x86_64-linux-gnu/liblog4cplus-1.1.so.9 [0]
     46864:	symbol=buffer4_receive;  lookup in file=/lib64/ld-linux-x86-64.so.2 [0]

Also, I’m confused about how the LD_LIBRARY_PATH issue would cause runtime issues.  Wouldn’t the hook fail to compile in the first place, or is LD_LIBRARY_PATH required at runtime?

Notwithstanding, I found this:

https://kea.isc.org/ticket/3741

Which suggests that while even though the startup error is different, running ldconfig after make install works, if required, however in my case, that didn’t do much of anything.

So any other insight appreciated :)

> On Sep 6, 2017, at 3:47 AM, Francis Dupont <fdupont at isc.org> wrote:
> 
> Try to get the HOOKS_OPEN_ERROR which returns errors from dlopen().
> Note the main reason to get dlopen to not find DSOs is to forget to
> set LD_LIBRARY_PATH...
> 
> Regards
> 
> Francis Dupont <fdupont at isc.org>