NetBSD Reproducibility Report #6

[Jan-Benedict Glaw]

On Sun, 2024-12-08 22:52:27 +0100, Jan-Benedict Glaw <jbglaw at lug-owl.de> wrote:
>   Two consecutive builds on NetBSD:
>     * evbarm-earmv6 was reproducible last time, but is no longer. [2]
[...]
> [2] Differences are in the sets/kern-RPI.tgz and kernel/netbsd-RPI.gz,
>     kernel/netbsd-RPI.img.gz, binary/gzimg/rpi.img.gz (and all
>     checksum files.) `diffoscope` output is:
> 	--- 1/netbsd
> 	+++ 2/netbsd
> 	├── readelf --wide --decompress --hex-dump=.data {}
> 	│ @@ -39663,15 +39663,15 @@
> 	│    0x8075aec0 cb95ae3d 67a83794 5d66b10e e0878b3a ...=g.7.]f.....:
> 	│    0x8075aed0 e1cb3464 82f76b1f 57457473 b2f23473 ..4d..k.WEts..4s
> 	│    0x8075aee0 2e44e999 10e4ae75 6cf2303d 939f2977 .D.....ul.0=..)w
> 	│    0x8075aef0 def6209f 3a62777c b4cab72f c1c282e5 .. .:bw|.../....
> 	│    0x8075af00 069f9a82 29137239 dd260ab5 acbd5d30 ....).r9.&....]0
> 	│    0x8075af10 352c2d23 6b180d07 58c003b2 32c30245 5,-#k...X...2..E
> 	│    0x8075af20 ea307a14 e7294049 0c605693 bf010ce4 .0z..)@I.`V.....
> 	│ -  0x8075af30 33f94780 00000000 00000000 00000000 3.G.............
> 	│ +  0x8075af30 33f94880 00000000 00000000 00000000 3.H.............
> 	│    0x8075af40 00000000 01000000 3c800080 00000000 ........<.......
> 	│    0x8075af50 00000100 12000000 b4810080 00000000 ................
> 	│    0x8075af60 00000100 22000000 40800080 00000000 ...."... at .......
> 	│    0x8075af70 00000100 33000000 0000a080 00000000 ....3...........
> 	│    0x8075af80 00001400 41000000 0040a080 00000000 ....A.... at ......
> 	│    0x8075af90 00001400 53000000 90800080 00000000 ....S...........
> 	│    0x8075afa0 00000100 6f000000 28810080 00000000 ....o...(.......
> 
>     As that's kind of meaningless, I've started two manual builds.
>     Maybe they also show a difference here, then I can try to track it
>     down to the actual object file that changed.

Those two builds couldn't reproduce the difference.

So my next priority will be to run builds tracking down CTF
differences between NetBSD- and Linux-based builds. My guess is a
qsort() in some tool as the most likely source.

MfG, JBG

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