Bug#915333: git-annex: Illegal Instruction on armel (Fujitsu Q700 like QNAP TS-21x/TS-22x)

[Darshaka Pathirana]

Hey,

On Mon, 11 Mar 2019 12:05:55 +0200 Adrian Bunk <bunk at debian.org> wrote:
> On Thu, Jan 31, 2019 at 08:12:17PM +0100, Bernhard Übelacker wrote:
> > Hello Everyone,
> > I own a qnap ts-119pII with a similar cpu.
> >
> > See attached file with several debugging attempts.

I took some time and wanted to reproduce and test this issue.

> > If I read [1] right, then the UXTH instruction is just supported
> > on ARMv6 or later.
>
> Looking at the code, the bug seems to be in
> https://sources.debian.org/src/ghc/8.4.4+dfsg1-2/debian/patches/llvm-arm-unknown-linux-gnueabi.patch/
>
> ARM1136JF-S is ARM11, which is ARMv6.
> arm9e would be correct here instead of arm1136jf-s.
>
> Due to the static-only nature of the ghc ecosystem the fix would then
> require a complete rebuild of all Haskell packages on armel, but with
> the buildds otherwise mostly idle now this should be finished within
> 2-3 days.

First I tried to reproduce the crash on one of our porterboxes[4]
`amdahl` (where I could not reproduce the bug, git-annex runs just
fine), but I only much later figured out that it run armv8l:

[4] https://db.debian.org/machines.cgi?host=amdahl

  dpat at amdahl ~ % export sessionid=913555
  dpat at amdahl ~ % schroot -b -c sid_armel-dchroot -n $sessionid
  I: 00check: Untarring chroot environment.  This might take a minute or two.
  I: 99porterbox-extra-sources: o To install build dependencies run
  I: 99porterbox-extra-sources:   dd-schroot-cmd -c 915333 apt-get update
  I: 99porterbox-extra-sources:   followed by build-dep/install as appropriate in the host system.
  I: 99porterbox-extra-sources: o If you started this session with schroot -b, please do not forget to run
  I: 99porterbox-extra-sources:   schroot --end-session -c 915333
  I: 99porterbox-extra-sources:   when you no longer need this environment.
  915333
  schroot -b -c sid_armel-dchroot -n $sessionid  9.08s user 5.17s system 126% cpu 11.293 total
  (sid_armel-dchroot)dpat at amdahl ~ % uname -a
  Linux amdahl 4.9.0-8-arm64 #1 SMP Debian 4.9.144-3.1 (2019-02-19) armv8l GNU/Linux

I also tried on `abel` but its a armv7l.

I then wanted to setup a qemu-arm environment but I am stuck finding out which
machine/cpu option would be correct. I found [1] and [2] which states that the CPU
"Feroceon 88FR131 rev 1 (v5l)" is a actually a Marvell Kirkwood 88F6281.
(Ok, [3] says that qnap ts-11x runs on Kirkwood system-on-chip (SoC) from Marvell).

[1] https://www.chainsawonatireswing.com/2012/01/07/find-out-which-cpu-your-synology-diskstation-uses/
[2] https://www.7-cpu.com/cpu/Kirkwood.html
[3] https://www.debian.org/releases/stable/armel/ch02s01.html.en (see 2.1.4)

So, is it possible to emulate a armv5 and if yes, how? Thanks.

Regards from the Debian BSP201904, Salzburg,
 - Darsha

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