Re: A reliable port cross-build failure (hangup) in my context (amd64->armv7 cross build, with native-tool speedup involved)

From: Mark Millard <marklmi_at_yahoo.com>
Date: Sun, 23 Dec 2018 23:28:04 -0800
[I built a FreeBSD head -r340288 context and tried ports head
-r484783 and the problem repeated.]

On 2018-Dec-22, at 12:55, Mark Millard <marklmi at yahoo.com> wrote:

> [I found my E-mail records reporting successful builds using
> qemu-user-static from ports head -r484783 under FreeBSD
> head -r340287.]
> 
> On 2018-Dec-22, at 00:10, Mark Millard <marklmi at yahoo.com> wrote:
> 
>> [I messed up the freebsd-emulation email address the first time I sent
>> this. I also forgot to indicate the qemu-user-static vintage relationship.]
>> 
>> I had been reporting intermittent hang-ups for my amd64->{aarch64,armv7} port cross
>> builds in another message sequence. But it turns out that one thing I ran into
>> has hung-up every time, the same way, for amd64->armv7 cross builds:
>> multimedia/gstreamer1-qt_at_qt5 . So I extract the material here into a separate report
>> with some updated notes.
>> 
>> A little context: I had built from ports head -r484783 before under FreeBSD head
>> -r340287 (as I remember the version). Back then it did not have this problem that it
>> now has under FreeBSD head -r341836 . One ports-specific change was to force perl5.28
>> as the default instead of perl5.26 originally. In fact this is what drives what is
>> being rebuilt for my experiment that caught this. But I doubt the perl version is
>> important to the problem. The context has a Ryzen Threadripper 1950X and has been
>> tested both for FreeBSD under Hyper-V and for the same media native-booted. Both
>> hang-up at the same point as seen via ps or top. The native tools for cross-build
>> speedup were in use. Cross-builds targeting aarch64 did not get this problem but
>> targeting armv7 did. 121 of 129 armv7 ports built before the hang-up for the first
>> armv7 try.
>> 
>> ADDED: The qemu-user-static back with head -r340287 before installing the
>> updated ports would likely be different than the -r484783 vintage. So both
>> FreeBSD and qemu-user-static may have changed over the comparison.
> 
> CORRECTION to ADDED: Back on 2018-Nov-11 I reported successful cross-builds
> based on qemu-user-static from ports head -484783 --all built under FreeBSD
> head -r340287 . So the use of the perl5.28 as the forced-default and the
> newer FreeBSD head version -r341836 as the context are the differences here.
> 
>> The hang-up:
>> 
>> In the port rebuilds targeting armv7, multimedia/gstreamer1-qt_at_qt5 hung-up and timed
>> out. Looking during the wait in later tries shows something much like (from one of the
>> examples):
>> 
>> root       33719    0.0  0.0  12920  3528  0  I    11:40       0:00.03 | |           `-- sh: poudriere[FBSDFSSDjailArmV7-default][02]: build_pkg (gstreamer1-qt5-1.2.0_14) (sh)
>> root       41551    0.0  0.0  12920  3520  0  I    11:43       0:00.00 | |             `-- sh: poudriere[FBSDFSSDjailArmV7-default][02]: build_pkg (gstreamer1-qt5-1.2.0_14) (sh)
>> root       41552    0.0  0.0  10340  1744  0  IJ   11:43       0:00.01 | |               `-- /usr/bin/make -C /usr/ports/multimedia/gstreamer1-qt FLAVOR=qt5 build
>> root       41566    0.0  0.0  10236  1796  0  IJ   11:43       0:00.00 | |                 `-- /bin/sh -e -c (cd /wrkdirs/usr/ports/multimedia/gstreamer1-qt/work-qt5/.build; if ! /usr/bin/env QT_SELE
>> root       41567    0.0  0.0  89976 12896  0  IJ   11:43       0:00.07 | |                   `-- /usr/local/bin/qemu-arm-static ninja -j28 -v all
>> root       41585    0.0  0.0 102848 25056  0  IJ   11:43       0:00.10 | |                     |-- /usr/local/bin/qemu-arm-static /usr/local/bin/cmake -E cmake_autogen /wrkdirs/usr/ports/multimedia/g
>> root       41586    0.0  0.0 102852 25072  0  IJ   11:43       0:00.11 | |                     `-- /usr/local/bin/qemu-arm-static /usr/local/bin/cmake -E cmake_autogen /wrkdirs/usr/ports/multimedia/g
>> 
>> or as top showed it:
>> 
>> 41552 root          1  52    0    10M  1744K    0 wait    15   0:00   0.00% /usr/bin/make -C /usr/ports/multimedia/gstreamer1-qt FLAVOR=qt5 build
>> 41566 root          1  52    0    10M  1796K    0 wait     1   0:00   0.00% /bin/sh -e -c (cd /wrkdirs/usr/ports/multimedia/gstreamer1-qt/work-qt5/.build; if ! /usr/bin/env QT_SELECT=qt5 QMAKEMODULES
>> 41567 root          2  52    0    88M    13M    0 select   4   0:00   0.00% /usr/local/bin/qemu-arm-static ninja -j28 -v all
>> 41585 root          2  52    0   100M    24M    0 kqread   8   0:00   0.00% /usr/local/bin/qemu-arm-static /usr/local/bin/cmake -E cmake_autogen /wrkdirs/usr/ports/multimedia/gstreamer1-qt/work-qt5/.
>> 41586 root          2  52    0   100M    24M    0 kqread  22   0:00   0.00% /usr/local/bin/qemu-arm-static /usr/local/bin/cmake -E cmake_autogen /wrkdirs/usr/ports/multimedia/gstreamer1-qt/work-qt5/.
>> 
>> So: waiting in kqread trying to run cmake.
>> 
>> Unlike some intermittent hang-ups, attaching-then-detaching via gdb does not
>> resume the hung-up processes. Kills of the processes waiting on kqread stop
>> the build.
>> 
>> Given the prior ports have been built already, building just
>> multimedia/gstreamer1-qt_at_qt5 still gets the hang-up at the same point.
>> 
>> Building anything that requires multimedia/gstreamer1-qt_at_qt5 seems to be
>> solidly blocked in my environment.


I built a FreeBSD head -r340288 context and tried cross-buiding an
amd64->armv7 ports head -r484783 of my usual ports and the problem
repeated. I also found evidence that originally in the old time frame
I'd disabled part of my originally-intended port builds because of
other problems so multimedia/gstreamer1-qt 's build was not being
tried.

So the qemu-user-static vintage or content may be what to vary to
narrow down the problem instead of bisecting FreeBSD kernel or world
vintages. clang7 building qemu-user-static or the kernel/world has
been eliminated.


(I used -r340288 to match a artifact.ci.freebsd.org build, incorrectly
expecting to bisect via kernel substitutions.)


===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
Received on Mon Dec 24 2018 - 06:28:17 UTC

This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:41:19 UTC