Hi Ludovic,
Ludovic Courtès <ludo@gnu.org> writes:
Toggle quote (12 lines)
> Mark H Weaver <mhw@netris.org> skribis:
>
>> The source checkout currently being transferred for build 3432472
>> (/gnu/store/…-font-google-material-design-icons-3.0.1-checkout) is 176
>> megabytes uncompressed, as measured by "du -s --si", which is not
>> precisely same as NAR size, but hopefully close enough for a rough
>> estimate. As I write this, build 3432472 been stuck here for 24 hours
>> 15 minutes. Even if the average transfer rate were 4 kilobytes per
>> second, it should have been done in half that time.
>
> This is weird, could it be that data transfers get stuck somehow?
As far as I can tell, that's what seems to happen.
Toggle quote (3 lines)
> Did you try to check the status of the ‘nix-store’ and ‘guix offload’
> processes on the head node?
Here are the corresponding 'guix offload' processes:
Toggle snippet (9 lines)
hydra@20121227-hydra:~$ ps auxwwf | head -1; ps auxwwf | egrep -B1 'off()load'
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 8984 0.0 0.0 30784 2248 ? Ss Apr07 0:00 | \_ /root/.guix-profile/bin/guix-daemon 8983 --max-jobs=1 --build-users-group=guixbuild --disable-log-compression --gc-keep-outputs --gc-keep-derivations --no-substitutes --cache-failures
root 8985 0.0 0.2 145532 13976 ? SLsl Apr07 0:10 | | \_ /gnu/store/yihvhxv3xyyvl1m2cy1lnf1lyi9h76fk-guile-2.2.2/bin/guile --no-auto-compile /gnu/store/fkkjhida23k612naa9d4q6avqj5v3b28-guix-0.13.0-8.357ab93/bin/.guix-real offload x86_64-linux 3600 1 72000
--
root 14768 0.0 0.0 30752 2356 ? Ss Apr07 0:00 | \_ /root/.guix-profile/bin/guix-daemon 14767 --max-jobs=1 --build-users-group=guixbuild --disable-log-compression --gc-keep-outputs --gc-keep-derivations --no-substitutes --cache-failures
root 14769 0.0 0.2 145668 10912 ? SLsl Apr07 0:16 | | \_ /gnu/store/yihvhxv3xyyvl1m2cy1lnf1lyi9h76fk-guile-2.2.2/bin/guile --no-auto-compile /gnu/store/fkkjhida23k612naa9d4q6avqj5v3b28-guix-0.13.0-8.357ab93/bin/.guix-real offload x86_64-linux 3600 1 72000
I tried attaching to both of these offload processes with 'strace', and
waited for several minutes for any system call activity. Both of them
are stuck sleeping within a system call, although I don't yet know which
system call:
Toggle snippet (10 lines)
root@20121227-hydra:~# strace -p 8985
Process 8985 attached - interrupt to quit
restart_syscall(<... resuming interrupted call ...>^C <unfinished ...>
Process 8985 detached
root@20121227-hydra:~# strace -p 14769
Process 14769 attached - interrupt to quit
restart_syscall(<... resuming interrupted call ...>^C <unfinished ...>
Process 14769 detached
Here are the 'nix-store' processes:
Toggle snippet (8 lines)
hydra@20121227-hydra:~$ ps auxwwf | head -1; ps auxwwf | egrep -A1 'hydra-()build'
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
hydra 8980 0.0 0.9 187332 46656 pts/5 S Apr07 0:01 | | \_ /usr/local/bin/perl -w /usr/local/bin/hydra-build 3432472
hydra 8983 0.0 0.0 34228 464 pts/5 S Apr07 0:00 | | | \_ nix-store --realise /gnu/store/5ivay4l7bn0sqsi7k53j4qv3kndrby17-font-google-material-design-icons-3.0.1.drv --timeout 72000 --max-silent-time 3600 --option build-max-log-size 67108864 --keep-going --fallback --no-build-output --log-type flat --print-build-trace --add-root /nix/var/nix/gcroots/per-user/hydra/hydra-roots/y61f3cdhx31msdhkdw0kfs5pb75ycgfq-font-google-material-design-icons-3.0.1
hydra 14764 0.0 0.9 187336 46576 pts/5 S Apr07 0:01 | | \_ /usr/local/bin/perl -w /usr/local/bin/hydra-build 3432052
hydra 14767 0.0 0.0 34228 352 pts/5 S Apr07 0:00 | | \_ nix-store --realise /gnu/store/k27i3lkb38gr3mw0mridymhik3qsg6w7-font-fira-sans-4.202.drv --timeout 72000 --max-silent-time 3600 --option build-max-log-size 67108864 --keep-going --fallback --no-build-output --log-type flat --print-build-trace --add-root /nix/var/nix/gcroots/per-user/hydra/hydra-roots/28ncfjmplcwyzas2p3d4cy5xlzacjcnj-font-fira-sans-4.202
The 'nix-store' processes seem to be stuck sleeping in 'read', if I'm
interpreting the 'strace' output correctly:
Toggle snippet (10 lines)
root@20121227-hydra:~# strace -p 8983
Process 8983 attached - interrupt to quit
read(3, ^C <unfinished ...>
Process 8983 detached
root@20121227-hydra:~# strace -p 14767
Process 14767 attached - interrupt to quit
read(3, ^C <unfinished ...>
Process 14767 detached
"netstat --inet --program" shows that the SSH connections are still
open:
Toggle snippet (7 lines)
root@20121227-hydra:~# netstat --inet --program | grep 'hydra\.net\.in\.tum\.'
tcp 0 0 20121227-hydra.gn:53216 hydra.net.in.tum.de:ssh ESTABLISHED 14769/guile
tcp 0 0 20121227-hydra.gn:52434 hydra.net.in.tum.de:ssh ESTABLISHED 8985/guile
tcp 0 0 20121227-hydra.gnu.:www hydra.net.in.tum.:52104 TIME_WAIT -
tcp 0 0 20121227-hydra.gnu.:www hydra.net.in.tum.:52103 TIME_WAIT -
Toggle quote (2 lines)
> I just checked and apparently this package builds fine on berlin.
Also, these same jobs (e.g. same versions) have been built successfully
on hydra.gnunet.org for years without difficulty. In the case of
'font-fira-sans-4.202.x86_64-linux', it has only ever been built on
hydra.gnunet.org, with the last successful build on 28 September 2018.
The packages haven't been updated in years, and so typically are only
rebuilt during 'core-updates' cycles. They only started aborting in
late March, when some other rarely-update package apparently changed to
force a rebuild. However, the similar 'mozjs-60' failures happened
earlier.
FYI, here's the history of build attempts on Hydra:
Toggle snippet (49 lines)
hydra=> select case when s.machine~'^(hydra|guix)\.' then s.machine else substring(s.machine from '^[^.]*') end as machine, jobset, s.build, s.stepnr as step, case when s.busy=1 then 'busy' when s.status=0 then NULL when s.status=1 then 'fail' when s.status=4 then 'abort' when s.status=7 then 'timeout' when s.status=8 then 'cfail' else '?' end as stat, regexp_replace(substr(s.drvpath,1+strpos(s.drvpath,'-')),'\.drv$','') as what, date_trunc('day', to_timestamp(s.stoptime)) as finished from builds b, buildsteps s where b.id=s.build and b.job='font-fira-sans-4.202.x86_64-linux' order by s.stoptime;
machine | jobset | build | step | stat | what | finished
------------------+--------------+---------+------+-------+----------------------+------------------------
hydra.gnunet.org | master | 2362639 | 1 | | font-fira-sans-4.202 | 2017-11-29 00:00:00+00
hydra.gnunet.org | core-updates | 2407845 | 1 | | font-fira-sans-4.202 | 2018-01-02 00:00:00+00
hydra.gnunet.org | core-updates | 2674686 | 1 | | font-fira-sans-4.202 | 2018-05-19 00:00:00+00
hydra.gnunet.org | core-updates | 3075254 | 1 | | font-fira-sans-4.202 | 2018-09-28 00:00:00+00
| master | 3432052 | 1 | abort | font-fira-sans-4.202 | 2019-03-31 00:00:00+00
| master | 3432052 | 2 | abort | font-fira-sans-4.202 | 2019-04-02 00:00:00+00
| master | 3432052 | 3 | abort | font-fira-sans-4.202 | 2019-04-03 00:00:00+00
| master | 3432052 | 4 | abort | font-fira-sans-4.202 | 2019-04-05 00:00:00+00
| master | 3432052 | 5 | abort | font-fira-sans-4.202 | 2019-04-05 00:00:00+00
| master | 3432052 | 6 | abort | font-fira-sans-4.202 | 2019-04-06 00:00:00+00
| master | 3432052 | 7 | abort | font-fira-sans-4.202 | 2019-04-06 00:00:00+00
| master | 3432052 | 8 | busy | font-fira-sans-4.202 |
(12 rows)
hydra=> select case when s.machine~'^(hydra|guix)\.' then s.machine else substring(s.machine from '^[^.]*') end as machine, jobset, s.build, s.stepnr as step, case when s.busy=1 then 'busy' when s.status=0 then NULL when s.status=1 then 'fail' when s.status=4 then 'abort' when s.status=7 then 'timeout' when s.status=8 then 'cfail' else '?' end as stat, regexp_replace(substr(s.drvpath,1+strpos(s.drvpath,'-')),'\.drv$','') as what, date_trunc('day', to_timestamp(s.stoptime)) as finished from builds b, buildsteps s where b.id=s.build and b.job='font-google-material-design-icons-3.0.1.i686-linux' order by s.stoptime;
machine | jobset | build | step | stat | what | finished
------------------+--------------+---------+------+-------+------------------------------------------------+------------------------
chapters | master | 1834047 | 1 | | font-google-material-design-icons-3.0.1 | 2017-02-13 00:00:00+00
hydra.gnunet.org | core-updates | 1889434 | 1 | | font-google-material-design-icons-3.0.1 | 2017-03-12 00:00:00+00
| master | 2030520 | 2 | cfail | glibc-intermediate-2.25 | 2017-04-30 00:00:00+00
| master | 2030520 | 1 | cfail | glibc-intermediate-2.25 | 2017-04-30 00:00:00+00
| master | 2030520 | 3 | cfail | glibc-intermediate-2.25 | 2017-04-30 00:00:00+00
guix.sjd.se | master | 2035120 | 1 | | font-google-material-design-icons-3.0.1 | 2017-05-04 00:00:00+00
guix.sjd.se | core-updates | 2111787 | 1 | | font-google-material-design-icons-3.0.1 | 2017-06-25 00:00:00+00
hydra.gnunet.org | master | 2128849 | 1 | | font-google-material-design-icons-3.0.1 | 2017-06-26 00:00:00+00
guix.sjd.se | core-updates | 2175161 | 1 | | font-google-material-design-icons-3.0.1 | 2017-07-20 00:00:00+00
| master | 2334641 | 1 | | font-google-material-design-icons-3.0.1.tar.gz | 2017-10-23 00:00:00+00
hydra.gnunet.org | master | 2334641 | 2 | | font-google-material-design-icons-3.0.1 | 2017-10-23 00:00:00+00
| core-updates | 2406391 | 1 | | module-import | 2018-01-02 00:00:00+00
| core-updates | 2406391 | 2 | | module-import-compiled | 2018-01-02 00:00:00+00
guix.sjd.se | core-updates | 2406391 | 3 | | font-google-material-design-icons-3.0.1 | 2018-01-02 00:00:00+00
guix.sjd.se | core-updates | 2667328 | 1 | | font-google-material-design-icons-3.0.1 | 2018-05-18 00:00:00+00
guix.sjd.se | core-updates | 3073906 | 1 | | font-google-material-design-icons-3.0.1 | 2018-09-25 00:00:00+00
| master | 3432472 | 1 | abort | font-google-material-design-icons-3.0.1 | 2019-03-29 00:00:00+00
| master | 3432472 | 2 | abort | font-google-material-design-icons-3.0.1 | 2019-03-30 00:00:00+00
| master | 3432472 | 3 | abort | font-google-material-design-icons-3.0.1 | 2019-03-31 00:00:00+00
| master | 3432472 | 4 | abort | font-google-material-design-icons-3.0.1 | 2019-04-02 00:00:00+00
| master | 3432472 | 5 | abort | font-google-material-design-icons-3.0.1 | 2019-04-03 00:00:00+00
| master | 3432472 | 6 | abort | font-google-material-design-icons-3.0.1 | 2019-04-05 00:00:00+00
| master | 3432472 | 7 | abort | font-google-material-design-icons-3.0.1 | 2019-04-05 00:00:00+00
| master | 3432472 | 8 | abort | font-google-material-design-icons-3.0.1 | 2019-04-06 00:00:00+00
| master | 3432472 | 9 | abort | font-google-material-design-icons-3.0.1 | 2019-04-06 00:00:00+00
| master | 3432472 | 10 | busy | font-google-material-design-icons-3.0.1 |
(26 rows)
It seems that Hydra fails to record the machine name in build steps that
are aborted, but I know that all of the 'aborts' above are on
hydra.gnunet.org, because that's currently the only x86 build slave on
Hydra.
I could easily believe that this problem is specific to
hydra.gnunet.org, but even if that's the case, it would be good if
offloading would reliably time out before days have passed.
Ideally, the timeout would be a "max-silent-time" kind of timeout, so
that we don't impose an arbitrary limitation on total transfer time as
long as progress is being made, and so that the timeout can be
relatively short. However, even a "total-transfer-time" kind of timeout
would be welcome at this point, to stop the profuse bleeding of Hydra's
limited x86 build capacity.
What do you think?
Mark