Reproducibility regression with mx6cuboxi

Vagrant Cascadian
2020-07-19T18:23:05Z

The mx6cuboxi target no longer builds reproducibility on Debian. I've
bisected it down to:

eb9124f5748c96ffd548e50fd6989c3b5395b353 mx6cuboxi: enable OF_CONTROL with DM_MMC and DM_USB

Based on the diffoscope output, it *might* have something to do with the
changes to how board detection uses gpios:

--- /tmp/tmpj_t0iqs7/control
+++ /tmp/tmpj_t0iqs7/experiment-time
? --- /tmp/tmpj_t0iqs7/control/source-root
??? +++ /tmp/tmpj_t0iqs7/experiment-time/source-root
? ? --- /tmp/tmpj_t0iqs7/control/source-root/u-boot-with-spl.imx
? ??? +++ /tmp/tmpj_t0iqs7/experiment-time/source-root/u-boot-with-spl.imx
? ? @@ -4346,16 +4346,16 @@
? ? 00010f90: 0000 0000 0000 0000 0000 0000 0000 0000 ................
? ? 00010fa0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
? ? 00010fb0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
? ? 00010fc0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
? ? 00010fd0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
? ? 00010fe0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
? ? 00010ff0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
? ? -00011000: 2705 1956 7088 eb01 5f14 7b49 0008 565c '..Vp..._.{I..V\
? ? -00011010: 1780 0000 1780 0000 9463 4032 1102 0500 .........c at 2....
? ? +00011000: 2705 1956 36e7 7190 5f14 7b49 0008 565c '..V6.q._.{I..V\
? ? +00011010: 1780 0000 1780 0000 de74 408a 1102 0500 .........t at .....
? ? 00011020: 0000 0000 0000 0000 0000 0000 0000 0000 ................
? ? 00011030: 0000 0000 0000 0000 0000 0000 0000 0000 ................
? ? 00011040: b800 00ea 14f0 9fe5 14f0 9fe5 14f0 9fe5 ................
? ? 00011050: 14f0 9fe5 14f0 9fe5 14f0 9fe5 14f0 9fe5 ................
? ? 00011060: 6000 8017 c000 8017 2001 8017 8001 8017 `....... .......
? ? 00011070: e001 8017 4002 8017 a002 8017 efbe adde .... at ...........
? ? 00011080: 2000 9000 00f0 20e3 00f0 20e3 00f0 20e3 ..... ... ... .
? ? @@ -33330,15 +33330,15 @@
? ? 00082310: 6c6f 636b 2d6d 6173 7465 7200 7369 6d70 lock-master.simp
? ? 00082320: 6c65 2d61 7564 696f 2d63 6172 642c 6672 le-audio-card,fr
? ? 00082330: 616d 652d 6d61 7374 6572 0073 696d 706c ame-master.simpl
? ? 00082340: 652d 6175 6469 6f2d 6361 7264 2c77 6964 e-audio-card,wid
? ? 00082350: 6765 7473 0073 696d 706c 652d 6175 6469 gets.simple-audi
? ? 00082360: 6f2d 6361 7264 2c72 6f75 7469 6e67 0073 o-card,routing.s
? ? 00082370: 6f75 6e64 2d64 6169 0064 6574 6563 742d ound-dai.detect-
? ? -00082380: 6770 696f 7300 6275 d00d feed 0000 9e9e gpios.bu........
? ? +00082380: 6770 696f 7300 0023 d00d feed 0000 9e9e gpios..#........
? ? 00082390: 0000 0038 0000 9600 0000 0028 0000 0011 ...8.......(....
? ? 000823a0: 0000 0010 0000 0000 0000 089e 0000 95c8 ................
? ? 000823b0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
? ? 000823c0: 0000 0001 0000 0000 0000 0003 0000 0004 ................
? ? 000823d0: 0000 0000 0000 0001 0000 0003 0000 0004 ................
? ? 000823e0: 0000 000f 0000 0001 0000 0003 0000 0033 ...............3
? ? 000823f0: 0000 001b 536f 6c69 6452 756e 2048 756d ....SolidRun Hum
? ? @@ -35868,15 +35868,15 @@
? ? 0008c1b0: 6c6f 636b 2d6d 6173 7465 7200 7369 6d70 lock-master.simp
? ? 0008c1c0: 6c65 2d61 7564 696f 2d63 6172 642c 6672 le-audio-card,fr
? ? 0008c1d0: 616d 652d 6d61 7374 6572 0073 696d 706c ame-master.simpl
? ? 0008c1e0: 652d 6175 6469 6f2d 6361 7264 2c77 6964 e-audio-card,wid
? ? 0008c1f0: 6765 7473 0073 696d 706c 652d 6175 6469 gets.simple-audi
? ? 0008c200: 6f2d 6361 7264 2c72 6f75 7469 6e67 0073 o-card,routing.s
? ? 0008c210: 6f75 6e64 2d64 6169 0064 6574 6563 742d ound-dai.detect-
? ? -0008c220: 6770 696f 7300 0023 d00d feed 0000 a473 gpios..#.......s
? ? +0008c220: 6770 696f 7300 3230 d00d feed 0000 a473 gpios.20.......s
? ? 0008c230: 0000 0038 0000 9b6c 0000 0028 0000 0011 ...8...l...(....
? ? 0008c240: 0000 0010 0000 0000 0000 0907 0000 9b34 ...............4
? ? 0008c250: 0000 0000 0000 0000 0000 0000 0000 0000 ................
? ? 0008c260: 0000 0001 0000 0000 0000 0003 0000 0004 ................
? ? 0008c270: 0000 0000 0000 0001 0000 0003 0000 0004 ................
? ? 0008c280: 0000 000f 0000 0001 0000 0003 0000 002f .............../
? ? 0008c290: 0000 001b 536f 6c69 6452 756e 2048 756d ....SolidRun Hum
? ? @@ -38499,8 +38499,8 @@
? ? 00096620: 2c62 6974 636c 6f63 6b2d 6d61 7374 6572 ,bitclock-master
? ? 00096630: 0073 696d 706c 652d 6175 6469 6f2d 6361 .simple-audio-ca
? ? 00096640: 7264 2c66 7261 6d65 2d6d 6173 7465 7200 rd,frame-master.
? ? 00096650: 7369 6d70 6c65 2d61 7564 696f 2d63 6172 simple-audio-car
? ? 00096660: 642c 7769 6467 6574 7300 7369 6d70 6c65 d,widgets.simple
? ? 00096670: 2d61 7564 696f 2d63 6172 642c 726f 7574 -audio-card,rout
? ? 00096680: 696e 6700 736f 756e 642d 6461 6900 6465 ing.sound-dai.de
? ? -00096690: 7465 6374 2d67 7069 6f73 0000 tect-gpios..
? ? +00096690: 7465 6374 2d67 7069 6f73 0061 tect-gpios.a

A similar diffoscope output is also available here:

https://tests.reproducible-builds.org/debian/rb-pkg/bullseye/armhf/diffoscope-results/u-boot.html

Using reprotest to diagnose the issue, it suggests the issue may be
related to the time of the build.

Is there a generated file embedded in the resulting image, or a
compressed archive of some kind (e.g. gzip, tar, zip, etc.) that might
include the build time?

https://diffoscope.org/
https://packages.debian.org/unstable/reprotest

live well,
vagrant
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