[...]

Length: 801534 (783K) [application/x-bzip2]
Saving to: 'lttng-ust-2.10.4.tar.bz2'
     0K .......... .......... .......... .......... ..........  6%  591K 1s
    50K .......... .......... .......... .......... .......... 12% 1.26M 1s
   100K .......... .......... .......... .......... .......... 19%  118M 1s
   150K .......... .......... .......... .......... .......... 25% 38.3M 0s
   200K .......... .......... .......... .......... .......... 31% 1.24M 0s
   250K .......... .......... .......... .......... .......... 38% 74.5M 0s
   300K .......... .......... .......... .......... .......... 44% 83.2M 0s
   350K .......... .......... .......... .......... .......... 51% 44.5M 0s
   400K .......... .......... .......... .......... .......... 57% 1.27M 0s
   450K .......... .......... .......... .......... .......... 63% 66.5M 0s
   500K .......... .......... .......... .......... .......... 70% 99.1M 0s
   550K .......... .......... .......... .......... .......... 76% 72.5M 0s
   600K .......... .......... .......... .......... .......... 83%  275M 0s
   650K .......... .......... .......... .......... .......... 89% 84.3M 0s
   700K .......... .......... .......... .......... .......... 95% 75.4M 0s
   750K .......... .......... .......... ..                   100% 74.7M=0.2s
2019-09-21 14:59:28 (3.66 MB/s) - 'lttng-ust-2.10.4.tar.bz2' saved [801534/801534]
warning: Could not canonicalize hostname: giant
Building target platforms: i686-linux
Wrote: /home/users/builder/rpm/SRPMS/lttng-ust-2.10.4-1.src.rpm
exit status 0
Tagging with prefix: auto/ti/
Already on 'master'
No conditional flags passed
from available:
--with   :	
--without:	 java python static_libs systemtap
Writing git revision for tag auto/ti/lttng-ust-2.10.4-1
error: Macro %_builddir has empty body
error: Macro %_builddir has empty body
Executing(--clean): env -i TMP=/home/users/builder/tmp HOME=/home/users/builder PATH=/bin:/usr/bin:/usr/sbin:/sbin:/usr/X11R6/bin TMPDIR=/home/users/builder/tmp  /bin/sh -e /home/users/builder/tmp/rpm-tmp.78668
+ umask 022
+ cd /home/users/builder/rpm/BUILD
+ rm -rf lttng-ust-2.10.4
Begin-TLD-Builder-Info
Build-Time: user:1.60s sys:0.80s real:6.44s (faults io:1 non-io:115744)
Files queued for ftp:
    810340 lttng-ust-2.10.4-1.src.rpm
       188 lttng-ust-2.10.4-1.src.rpm.uploadinfo
End-TLD-Builder-Info