Bug 201451 - randomdev.o undefined references when running make buildkernel
Summary: randomdev.o undefined references when running make buildkernel
Status: Closed FIXED
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: CURRENT
Hardware: Any Any
: --- Affects Only Me
Assignee: Mark Murray
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-07-10 04:41 UTC by Michael Vale
Modified: 2015-08-31 20:13 UTC (History)
4 users (show)

See Also:

Attachments
amd64 GENERIC kernel config used (14.52 KB, text/plain)
2015-08-31 00:37 UTC, Robin Randhawa 		no flags Details
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Description Michael Vale 2015-07-10 04:41:19 UTC 
randomdev.o: In function `read_random':
/usr/src/sys/dev/random/randomdev.c:189: undefined reference to `random_alg_context'
/usr/src/sys/dev/random/randomdev.c:191: undefined reference to `random_alg_context'
/usr/src/sys/dev/random/randomdev.c:200: undefined reference to `random_alg_context'
/usr/src/sys/dev/random/randomdev.c:207: undefined reference to `random_alg_context'
randomdev.o: In function `randomdev_unblock':
/usr/src/sys/dev/random/randomdev.c:256: undefined reference to `random_alg_context'
randomdev.o:/usr/src/sys/dev/random/randomdev.c:343: more undefined references to `random_alg_context' follow
randomdev.o: In function `random_sources_feed':
/usr/src/sys/dev/random/randomdev.c:346: undefined reference to `random_harvest_direct'
/usr/src/sys/dev/random/randomdev.c:343: undefined reference to `random_alg_context'
randomdev.o: In function `randomdev_read':
/usr/src/sys/dev/random/randomdev.c:142: undefined reference to `random_alg_context'
/usr/src/sys/dev/random/randomdev.c:145: undefined reference to `random_alg_context'
/usr/src/sys/dev/random/randomdev.c:150: undefined reference to `random_alg_context'
/usr/src/sys/dev/random/randomdev.c:152: undefined reference to `random_alg_context'
randomdev.o:/usr/src/sys/dev/random/randomdev.c:145: more undefined references to `random_alg_context' follow
scmouse.o: In function `sc_mouse_ioctl':
/usr/src/sys/dev/syscons/scmouse.c:669: undefined reference to `random_harvest_queue'
syscons.o: In function `scgetc':
/usr/src/sys/dev/syscons/syscons.c:3414: undefined reference to `random_harvest_queue'
vt_core.o: In function `vt_processkey':
/usr/src/sys/dev/vt/vt_core.c:736: undefined reference to `random_harvest_queue'
vt_sysmouse.o: In function `sysmouse_process_event':
/usr/src/sys/dev/vt/vt_sysmouse.c:142: undefined reference to `random_harvest_queue'
kern_intr.o: In function `swi_sched':
/usr/src/sys/kern/kern_intr.c:1129: undefined reference to `random_harvest_queue'
kern_intr.o:/usr/src/sys/kern/kern_intr.c:891: more undefined references to `random_harvest_queue' follow
subr_bus.o: In function `device_attach':
/usr/src/sys/kern/subr_bus.c:2887: undefined reference to `random_harvest_direct'
if_ethersubr.o: In function `ether_input_internal':
/usr/src/sys/net/if_ethersubr.c:429: undefined reference to `random_harvest_queue'
if_tun.o: In function `tunwrite':
/usr/src/sys/net/if_tun.c:909: undefined reference to `random_harvest_queue'
ffs_inode.o: In function `ffs_update':
/usr/src/sys/ufs/ffs/ffs_inode.c:156: undefined reference to `random_harvest_queue'
uma_core.o: In function `uma_zalloc_arg':
/usr/src/sys/vm/uma_core.c:2139: undefined reference to `random_harvest_fast'
uma_core.o: In function `uma_zfree_arg':
/usr/src/sys/vm/uma_core.c:2681: undefined reference to `random_harvest_fast'
*** Error code 1
Comment 1 Tony Narlock 2015-07-25 05:26:42 UTC 
(note, I am building 11-CURRENT from 10.1-RELEASE)

# Revision: 285868

$ clang -v
FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512
Target: x86_64-unknown-freebsd10.1
Thread model: posix
Selected GCC installation: 

$ freebsd-version -ku; uname -apKU                    
10.1-RELEASE-p14
10.1-RELEASE-p14
FreeBSD z600 10.1-RELEASE-p14 FreeBSD 10.1-RELEASE-p14 #14: Tue Jul 14 14:26:13 CDT 2015     root@z600:/usr/obj/usr/src/sys/MYKERNEL  amd64 amd64 1001000 1001000

# make buildkernel

<snip>

--------------------------------------------------------------
>>> stage 3.2: building everything
--------------------------------------------------------------
cd /usr/obj/usr/src/sys/GENERIC; MAKEOBJDIRPREFIX=/usr/obj  MACHINE_ARCH=amd64  MACHINE=amd64  CPUTYPE= GROFF_BIN_PATH=/usr/obj/usr/src/tmp/legacy/usr/bin  GROFF_FONT_PATH=/usr/obj/usr/src/tmp/legacy/usr/share/groff_font  GROFF_TMAC_PATH=/usr/obj/usr/src/tmp/legacy/usr/share/tmac  _LDSCRIPTROOT=  VERSION="FreeBSD 11.0-CURRENT amd64 1100077"  INSTALL="sh /usr/src/tools/install.sh"  PATH=/usr/obj/usr/src/tmp/legacy/usr/sbin:/usr/obj/usr/src/tmp/legacy/usr/bin:/usr/obj/usr/src/tmp/legacy/bin:/usr/obj/usr/src/tmp/usr/sbin:/usr/obj/usr/src/tmp/usr/bin:/sbin:/bin:/usr/sbin:/usr/bin CC="cc " CXX="c++  "  DEPFLAGS=""  CPP="cpp "  AS="as" AR="ar" LD="ld" NM=nm  OBJDUMP=objdump OBJCOPY="objcopy"  RANLIB=ranlib STRINGS=  SIZE="size" make  -D NO_CLEAN -m /usr/src/share/mk  KERNEL=kernel all -DNO_MODULES_OBJ
linking kernel.debug
randomdev.o: In function `read_random_uio':
/usr/src/sys/dev/random/randomdev.c:170: undefined reference to `random_alg_context'
/usr/src/sys/dev/random/randomdev.c:174: undefined reference to `random_alg_context'
/usr/src/sys/dev/random/randomdev.c:180: undefined reference to `random_alg_context'
/usr/src/sys/dev/random/randomdev.c:185: undefined reference to `random_alg_context'
/usr/src/sys/dev/random/randomdev.c:206: undefined reference to `random_alg_context'
randomdev.o:/usr/src/sys/dev/random/randomdev.c:233: more undefined references to `random_alg_context' follow
randomdev.o: In function `random_sources_feed':
/usr/src/sys/dev/random/randomdev.c:390: undefined reference to `random_harvest_direct'
/usr/src/sys/dev/random/randomdev.c:387: undefined reference to `random_alg_context'
randomdev.o: In function `randomdev_write':
/usr/src/sys/dev/random/randomdev.c:270: undefined reference to `random_alg_context'
/usr/src/sys/dev/random/randomdev.c:270: undefined reference to `random_alg_context'
randomdev.o: In function `randomdev_poll':
/usr/src/sys/dev/random/randomdev.c:286: undefined reference to `random_alg_context'
randomdev.o: In function `random_alg_context_ra_deinit_alg':
/usr/src/sys/dev/random/randomdev.c:138: undefined reference to `random_alg_context'
randomdev.o:/usr/src/sys/dev/random/randomdev.c:131: more undefined references to `random_alg_context' follow
scmouse.o: In function `sc_mouse_ioctl':
/usr/src/sys/dev/syscons/scmouse.c:669: undefined reference to `random_harvest_queue'
syscons.o: In function `scgetc':
/usr/src/sys/dev/syscons/syscons.c:3414: undefined reference to `random_harvest_queue'
vt_core.o: In function `vt_processkey':
/usr/src/sys/dev/vt/vt_core.c:778: undefined reference to `random_harvest_queue'
vt_sysmouse.o: In function `sysmouse_process_event':
/usr/src/sys/dev/vt/vt_sysmouse.c:142: undefined reference to `random_harvest_queue'
kern_intr.o: In function `swi_sched':
/usr/src/sys/kern/kern_intr.c:1149: undefined reference to `random_harvest_queue'
kern_intr.o:/usr/src/sys/kern/kern_intr.c:897: more undefined references to `random_harvest_queue' follow
subr_bus.o: In function `device_attach':
/usr/src/sys/kern/subr_bus.c:2887: undefined reference to `random_harvest_direct'
if_ethersubr.o: In function `ether_input_internal':
/usr/src/sys/net/if_ethersubr.c:429: undefined reference to `random_harvest_queue'
if_tun.o: In function `tunwrite':
/usr/src/sys/net/if_tun.c:909: undefined reference to `random_harvest_queue'
ffs_inode.o: In function `ffs_update':
/usr/src/sys/ufs/ffs/ffs_inode.c:156: undefined reference to `random_harvest_queue'
uma_core.o: In function `uma_zalloc_arg':
/usr/src/sys/vm/uma_core.c:2139: undefined reference to `random_harvest_fast'
uma_core.o: In function `uma_zfree_arg':
/usr/src/sys/vm/uma_core.c:2681: undefined reference to `random_harvest_fast'
*** Error code 1

Stop.
make[2]: stopped in /usr/obj/usr/src/sys/GENERIC
*** Error code 1

Stop.
make[1]: stopped in /usr/src
*** Error code 1

Stop.
make: stopped in /usr/src
Comment 2 Tony Narlock 2015-07-25 05:51:13 UTC 
Ctrl-F for 20150630 in UPDATING.

I added

> options	RANDOM_YARROW	# Legacy /dev/random algorithm.

to my custom buld config (pretty much follow this: https://www.freebsd.org/doc/handbook/kernelconfig-config.html)

and I get past the build error. It's possble I'm getting this error because I'm on 10.1-RELEASE.

However, my efforts to do buildworld first, and compile the /sys/modules/random failed. I gave up and proceeded to add the option above.
Comment 3 Mark Murray freebsd_committer freebsd_triage 2015-07-25 13:36:43 UTC 
(In reply to Tony Narlock from comment #2)

Hi

Please post the whole kernel config file - the one that is failing.

Thanks!

M
Comment 4 Tony Narlock 2015-07-25 16:09:00 UTC 
(In reply to Mark Murray from comment #3)

I do not have this anymore and haven't unfortunately I haven't been able to reproduce it.

As I best remember, I was using the GENERIC config and it was identical (at least line count) with the GENERIC on github.com/freebsd/freebsd at the time.

If I reproduce this I will report back with a copy.

https://github.com/freebsd/freebsd/commit/e853fb249f0a2e510bb3c9a54cda60ba290e5777#diff-9616781c03f0869f8d84637943d6b516

To get the kernel to compile - I added:

> options RANDOM_YARROW

under:

> device random
Comment 5 Mark Murray freebsd_committer freebsd_triage 2015-07-25 16:13:09 UTC 
(In reply to Tony Narlock from comment #4)

Without being able to reproduce this, there is not much to fix :-)

Your problem has hints of a "not-quite-CURRENT" source tree, as (e.g.) the sys/modules/random directory should not have been there.

I'll leave this open for a few days to see if the problem comes back and then close it.

Is that OK?

M
Comment 6 Tony Narlock 2015-07-25 16:39:57 UTC 
(In reply to Mark Murray from comment #5)
Agreed. Let's see if I / someone else can reproduce this and provide the info again, if not we can move on.

Thanks
Comment 7 Robin Randhawa 2015-08-31 00:33:26 UTC 
(In reply to Tony Narlock from comment #6)

Hi. I seem to be hitting a problem that may be related to the one being discussed here while trying to upgrade 11.0-CURRENT on my Thinkpad T430:

####################################################
[root@carbon /home/robin/work/repos/freebsd-head.git]# make buildkernel KERNCONF=GENERIC
.
.
MAKE=make sh /usr/home/robin/work/repos/freebsd-head.git/sys/conf/newvers.sh GENERIC
cc  -c -O2 -pipe -fno-strict-aliasing  -g -nostdinc  -I. -I/usr/home/robin/work/repos/freebsd-head.git/sys -I/usr/home/robin/work/repos/freebsd-head.git/sys/contrib/libfdt -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h  -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float  -fno-asynchronous-unwind-tables -ffreestanding -fwrapv -fstack-protector -gdwarf-2 -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef -Wno-pointer-sign -fformat-extensions  -Wmissing-include-dirs -fdiagnostics-show-option  -Wno-unknown-pragmas  -Wno-error-tautological-compare -Wno-error-empty-body  -Wno-error-parentheses-equality -Wno-error-unused-function  -Wno-error-pointer-sign  -mno-aes -mno-avx  -std=iso9899:1999 -Werror  vers.c
ctfconvert -L VERSION -g vers.o
linking kernel.debug
random_infra.o:(.data+0xb0): undefined reference to `random_alg_context'
kern_mib.o: In function `sysctl_kern_arnd':
/usr/home/robin/work/repos/freebsd-head.git/sys/kern/kern_mib.c:164: undefined reference to `read_random'
arc4random.o: In function `arc4_randomstir':
/usr/home/robin/work/repos/freebsd-head.git/sys/libkern/arc4random.c:61: undefined reference to `read_random'
sctp_auth.o: In function `sctp_generate_random_key':
/usr/home/robin/work/repos/freebsd-head.git/sys/netinet/sctp_auth.c:326: undefined reference to `read_random'
sctp_auth.o: In function `sctp_initialize_auth_params':
/usr/home/robin/work/repos/freebsd-head.git/sys/netinet/sctp_auth.c:1995: undefined reference to `read_random'
sctp_output.o: In function `sctp_send_initiate_ack':
/usr/home/robin/work/repos/freebsd-head.git/sys/netinet/sctp_output.c:5951: undefined reference to `read_random'
sctp_pcb.o:/usr/home/robin/work/repos/freebsd-head.git/sys/netinet/sctp_pcb.c:2628: more undefined references to `read_random' follow
ivy.o: In function `rdrand_modevent':
/usr/home/robin/work/repos/freebsd-head.git/sys/dev/random/ivy.c:115: undefined reference to `random_source_deregister'
/usr/home/robin/work/repos/freebsd-head.git/sys/dev/random/ivy.c:108: undefined reference to `random_source_register'
nehemiah.o: In function `nehemiah_modevent':
/usr/home/robin/work/repos/freebsd-head.git/sys/dev/random/nehemiah.c:136: undefined reference to `random_source_deregister'
/usr/home/robin/work/repos/freebsd-head.git/sys/dev/random/nehemiah.c:127: undefined reference to `random_source_register'
*** Error code 1

Stop.
make[2]: stopped in /usr/obj/usr/home/robin/work/repos/freebsd-head.git/sys/GENERIC
*** Error code 1

Stop.
####################################################

Here are relevant snippets of information about my build environment. Note that I am using the github mirror at:
https://github.com/freebsd/freebsd.git

[root@carbon /home/robin/work/repos/freebsd-head.git]# uname -a
FreeBSD carbon 11.0-CURRENT FreeBSD 11.0-CURRENT #2 3fef960(master): Sun Jan 25 18:49:25 GMT 2015     robin@carbon:/usr/obj/usr/home/robin/work/repos/freebsd-head.git/sys/GENERIC  amd64

[root@carbon /home/robin/work/repos/freebsd-head.git]# git log --pretty=oneline | head -n 1
31eef3e08357d5af4fef967ad8b295e666c51a4f The vendor's DTS for Allwinner A20 uses a different way to map the gpio pins, they specify the bank and the pin in two separated cells.

[root@carbon /home/robin/work/repos/freebsd-head.git]# clang -v
clang version 3.5.0 (trunk 210095)
Target: x86_64-unknown-freebsd11.0
Thread model: posix

I haven't touched the config file (amd64 GENERIC). Will try and attach it after posting this current note.

Any help appreciated.
Comment 8 Robin Randhawa 2015-08-31 00:37:00 UTC 
Created attachment 160545 [details]
amd64 GENERIC kernel config used

This is the kernel config I used for buildkernel. I'm not including the config snippets included in turn by this one. As mentioned in the bug commentary, I haven't touched the configs - so using the pristine ones in the repository.
Comment 9 Robin Randhawa 2015-08-31 07:38:46 UTC 
One more data point: if I try the remedy suggested by Tony and add 'options RANDOM_YARROW' then some of the link time missing symbols get resolved but there are others to do with rijndael that aren't:

############################################

[root@carbon /home/robin/work/repos/freebsd-head.git]# make buildkernel KERNCONF=GENERIC
.
.
MAKE=make sh /usr/home/robin/work/repos/freebsd-head.git/sys/conf/newvers.sh GENERIC
cc  -c -O2 -pipe -fno-strict-aliasing  -g -nostdinc  -I. -I/usr/home/robin/work/repos/freebsd-head.git/sys -I/usr/home/robin/work/repos/freebsd-head.git/sys/contrib/libfdt -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h  -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float  -fno-asynchronous-unwind-tables -ffreestanding -fwrapv -fstack-protector -gdwarf-2 -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef -Wno-pointer-sign -fformat-extensions  -Wmissing-include-dirs -fdiagnostics-show-option  -Wno-unknown-pragmas  -Wno-error-tautological-compare -Wno-error-empty-body  -Wno-error-parentheses-equality -Wno-error-unused-function  -Wno-error-pointer-sign  -mno-aes -mno-avx  -std=iso9899:1999 -Werror  vers.c
ctfconvert -L VERSION -g vers.o
linking kernel.debug
hash.o: In function `randomdev_encrypt_init':
/usr/home/robin/work/repos/freebsd-head.git/sys/dev/random/hash.c:87: undefined reference to `rijndael_cipherInit'
/usr/home/robin/work/repos/freebsd-head.git/sys/dev/random/hash.c:88: undefined reference to `rijndael_makeKey'
hash.o: In function `randomdev_encrypt':
/usr/home/robin/work/repos/freebsd-head.git/sys/dev/random/hash.c:99: undefined reference to `rijndael_blockEncrypt'
*** Error code 1

Stop.
make[2]: stopped in /usr/obj/usr/home/robin/work/repos/freebsd-head.git/sys/GENERIC
*** Error code 1

Stop.
make[1]: stopped in /usr/home/robin/work/repos/freebsd-head.git
*** Error code 1

Stop.
make: stopped in /usr/home/robin/work/repos/freebsd-head.git
*** Error code 1

############################################
Comment 10 Mark Murray freebsd_committer freebsd_triage 2015-08-31 07:44:33 UTC 
Hi

Please ensure that your source tree is completely up to date, clean ("make cleandir") and that ${.OBJDIR} (defaults to /usr/obj) is empty.

Then please try again.

M
Comment 11 Robin Randhawa 2015-08-31 08:34:13 UTC 
(In reply to Mark Murray from comment #10)

Hi Mark. Thanks for the response. I was pretty certain I started off with a clean slate. To confirm I repeated with a top level cleandir and the complete removal of the contents of /usr/obj. Also removed the 'options RANDOM_YARROW' addition to GENERIC. The problem persists:

########################################################

[root@carbon /home/robin/work/repos/freebsd-head.git]# make buildkernel KERNCONF=GENERIC
.
.
MAKE=make sh /usr/home/robin/work/repos/freebsd-head.git/sys/conf/newvers.sh GENERIC
cc  -c -O2 -pipe -fno-strict-aliasing  -g -nostdinc  -I. -I/usr/home/robin/work/repos/freebsd-head.git/sys -I/usr/home/robin/work/repos/freebsd-head.git/sys/contrib/libfdt -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h  -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float  -fno-asynchronous-unwind-tables -ffreestanding -fwrapv -fstack-protector -gdwarf-2 -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef -Wno-pointer-sign -fformat-extensions  -Wmissing-include-dirs -fdiagnostics-show-option  -Wno-unknown-pragmas  -Wno-error-tautological-compare -Wno-error-empty-body  -Wno-error-parentheses-equality -Wno-error-unused-function  -Wno-error-pointer-sign  -mno-aes -mno-avx  -std=iso9899:1999 -Werror  vers.c
ctfconvert -L VERSION -g vers.o
linking kernel.debug
random_infra.o:(.data+0xb0): undefined reference to `random_alg_context'
kern_mib.o: In function `sysctl_kern_arnd':
/usr/home/robin/work/repos/freebsd-head.git/sys/kern/kern_mib.c:164: undefined reference to `read_random'
arc4random.o: In function `arc4_randomstir':
/usr/home/robin/work/repos/freebsd-head.git/sys/libkern/arc4random.c:61: undefined reference to `read_random'
sctp_auth.o: In function `sctp_generate_random_key':
/usr/home/robin/work/repos/freebsd-head.git/sys/netinet/sctp_auth.c:326: undefined reference to `read_random'
sctp_auth.o: In function `sctp_initialize_auth_params':
/usr/home/robin/work/repos/freebsd-head.git/sys/netinet/sctp_auth.c:1995: undefined reference to `read_random'
sctp_output.o: In function `sctp_send_initiate_ack':
/usr/home/robin/work/repos/freebsd-head.git/sys/netinet/sctp_output.c:5951: undefined reference to `read_random'
sctp_pcb.o:/usr/home/robin/work/repos/freebsd-head.git/sys/netinet/sctp_pcb.c:2628: more undefined references to `read_random' follow
ivy.o: In function `rdrand_modevent':
/usr/home/robin/work/repos/freebsd-head.git/sys/dev/random/ivy.c:115: undefined reference to `random_source_deregister'
/usr/home/robin/work/repos/freebsd-head.git/sys/dev/random/ivy.c:108: undefined reference to `random_source_register'
nehemiah.o: In function `nehemiah_modevent':
/usr/home/robin/work/repos/freebsd-head.git/sys/dev/random/nehemiah.c:136: undefined reference to `random_source_deregister'
/usr/home/robin/work/repos/freebsd-head.git/sys/dev/random/nehemiah.c:127: undefined reference to `random_source_register'
*** Error code 1

Stop.
make[2]: stopped in /usr/obj/usr/home/robin/work/repos/freebsd-head.git/sys/GENERIC
*** Error code 1

Stop.
make[1]: stopped in /usr/home/robin/work/repos/freebsd-head.git
*** Error code 1

Stop.
make: stopped in /usr/home/robin/work/repos/freebsd-head.git

########################################################

Happy to try anything else or provide any other information - do let me know.
Comment 12 Mark Murray freebsd_committer freebsd_triage 2015-08-31 08:38:56 UTC 
What does "git status" say?
Comment 13 Robin Randhawa 2015-08-31 08:46:28 UTC 
(In reply to Mark Murray from comment #12)

Nothing incriminating IMHO:

[root@carbon /home/robin/work/repos/freebsd-head.git]# git status
On branch master
Your branch is up-to-date with 'origin/master'.

nothing to commit, working directory clean
[root@carbon /home/robin/work/repos/freebsd-head.git]# git branch
* master
[root@carbon /home/robin/work/repos/freebsd-head.git]# git remote -v
origin	https://github.com/freebsd/freebsd.git (fetch)
origin	https://github.com/freebsd/freebsd.git (push)
Comment 14 Mark Murray freebsd_committer freebsd_triage 2015-08-31 09:16:48 UTC 
I can't reproduce this - I have a checkout of the same source as you do (done in the last hour), and it works.
Comment 15 Mark Murray freebsd_committer freebsd_triage 2015-08-31 09:38:36 UTC 
Could you try doing your build as 

$ make KERNCONF=GENERIC buildworld buildkernel

please?
Comment 16 Robin Randhawa 2015-08-31 19:59:46 UTC 
(In reply to Mark Murray from comment #15)

This took longer than I expected. The problem doesn't manifest itself when I use your recommended sequence. I can therefore only assume that there was some dependency on a world element that caused this problem.

Thanks!
Comment 17 Mark Murray freebsd_committer freebsd_triage 2015-08-31 20:03:06 UTC 
Thanks for the feedback! The way that I showed you is the right way to build freebsd, particularly from older versions.

Is it OK if I close this bug?
Comment 18 Robin Randhawa 2015-08-31 20:09:05 UTC 
(In reply to Mark Murray from comment #17)

Fine by me. Thanks once again!
Comment 19 Mark Murray freebsd_committer freebsd_triage 2015-08-31 20:13:04 UTC 
Thanks for using FreeBSD!
Comment 20 Mark Murray freebsd_committer freebsd_triage 2015-08-31 20:13:35 UTC 
Advised on how to build from previous version.