buildman stops (crashed) on current master

[Stefano Babic]

Hi Simon,

On 07.10.21 15:43, Simon Glass wrote:
> Hi Stefano,
> 
> On Thu, 7 Oct 2021 at 04:37, Stefano Babic <sbabic at denx.de> wrote:
>>
>> Hi all,
>>
>> CI stops by building aarch64 without notice, for reference:
>>
>> https://source.denx.de/u-boot/custodians/u-boot-imx/-/jobs/332319
>>
>> There is no error, just process is killed. It looks like it stops at
>> xilinx_zynqmp_virt,
>>
>> ./tools/buildman/buildman -o /tmp -P -E -W aarch64but board can be built
>> without issues.
>>
>> If I build on my host (not in docker, anyway), it generally builds fine
>> - but it crashes sometimes, too. On gitlab instance , it crashes.
>> Issue does not seem that depends on merged patches, and introduces
>> boards were already built successfully. Any hint ? I have also no idea
>> what I should look as what I see is just
>>
>> "usr/bin/bash: line 104:    24 Killed
>> ./tools/buildman/buildman -o /tmp -P -E -W aarch64"
> 
> I cannot see that link. I am not sure what is going on. Does it say
> what signal killed it?

Pipelines on our server were not public - I have enbaled now for u-boot-imx.

> 
> Does it sit there for an hour and timeout? If so, then I  did see that
> myself once recently, when the Kconfig needed stdin, but I could not
> quitetie it down. I think buildman would provide it, but sometimes
> not, apparently. So it can happen when there is an existing build
> there and your new one which adds Kconfig options that don't have
> defaults, or something like that?
> 

I have investigated further, and I can reproduce it on my host outside 
the gitlab server. buildman causes a OOM, but I cannot find the cause.

Strange enough, this happens with the "aarch64" target, and I cannot 
reproduce it with Tom's master. So it seems that -master is ok, and 
somethin on u-boot-imx generates the OOM.

However....

The OOM happens always when -2 (two boards remain) appears. I can see 
with htop that buildman starts to allocate memory until it is exhausted 
(64GB RAM + 8 GB swap). Then the kernel decides that it is enough and 
kills buildman - this is what I see on Ci.

You can see now the pipelines:

https://source.denx.de/u-boot/custodians/u-boot-imx/-/pipelines/9520

I have then split aarch64 and I built imx8 separately - same result. The 
pipeline stops with xilinx board, but they have nothing to do. In fact, 
I can build all xilinx board separately. If I run buildman -W aarch64 -x 
xilinx, OOM is shown by another board.

Strange enough, I can build each single board with buildman without 
issues, neither errors nor warnongs. Just when buildman runs all 
together (aarch64, 308 boards), the OOM is generated.

Bisect does not help: I started bisect, and at the end this commit was 
presented:

commit 53a24dee86fb72ae41e7579607bafe13442616f2
Author: Fabio Estevam <festevam at denx.de>
Date:   Mon Aug 23 21:11:09 2021 -0300

     imx8mm-cl-iot-gate: Split the defconfigs


But it is a fake: I can revert it, I get the issue again. And the patch 
has nothing to do.

It looks to me it is something in binman, maybe triggered by some 
changes in tree, but all boards can be built separately without issues. 
I supposed to find the cause in code due to applied patches, but because 
each board can be built and no help from bisect, I am quite puzzled. I 
avoid to send a PR to Tom, else I guess the problem goes into -master, 
but I do not know how to proceed, and I have a lot of patches to be applied.

What can be done ?

> If that is it, you can repeat it by clearing out your .bm-work

On gitlab, the build starts from scratch.

> directory then building just that board for one commit, then the next
> (with the Kconfig change).

I have run buildman for each single board, all of them were successuful. 
With aarch64, I get OOM from buildman.

> 
> Buildman is supposed to handle this, of course. I'm not sure what has changed.
> 

Regards,
Stefano

-- 
=====================================================================
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic at denx.de
=====================================================================