--- Log opened Sat Dec 18 00:00:04 2021
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01:09 < hebasto> it was required to clean depends dir
01:40 < hebasto> fanquake: interesting that my mismatched hashes were consistent with two different vms, and both of them made a previous build for 27f353d8efca19bc2f7dc79b09d4737c9401a768 from #23757
01:40 < gribble> https://github.com/bitcoin/bitcoin/issues/23757 | [build] Android: fix GUI not loading on Qt 5.15 by icota · Pull Request #23757 · bitcoin/bitcoin · GitHub
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01:54 < laanwj> that's really strange, it rules out a random fluke or hw corruption
02:16 < hebasto> laanwj: fanquake: only `bitcoin-qt` differs
02:22 < laanwj> i wonder if it's one of the new qt changes that introduced a nondeterminism based on environment/file system (e.g. resources file sorting)
02:23 < laanwj> what's the setup of this vms? what file system do they use?
02:26 < hebasto> first one -- ubuntu 21.04, ext4; second one -- debian 11.1, ext4; hypervisor -- Virtualbox
02:26 < laanwj> ok, sounds normal enough...
02:28 < hebasto> diffoscope shows some diffs in `.rodata`
02:30 < hebasto> I saw similar diffs once before
02:38 < laanwj> what's the content of the diverging data?
02:39 < laanwj> i could take a look at it too (it's usually possible to figure out what is the structure that is different, though debug symbols)
02:39 < hebasto> https://www.irccloud.com/pastebin/L9ePbKzs/
02:40 < hebasto> ^ is it helpful?
02:41 < laanwj> it does look like resource data
02:41 < laanwj> the utf16 encoding is a giveaway
02:43 < laanwj> though the specific structure doesn't look familiar to me
02:46 < laanwj> https://doc.qt.io/qt-6/qtgui-attribution-webgradients.html    webgradients binary json qt brings me here, so it's a bunch of hardcoded gradients generated with a tool
02:48 < laanwj> it could be that this tool is not determinstic, but this is increasingly baseless guessing...
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03:03 < laanwj> in any case this means the qt library itself, or at least a source/intermediate file built as part of qt is divergent
03:06 < hebasto> btw, there is a pr that helps to track down non-determinism in depends locally -- #21995
03:06 < gribble> https://github.com/bitcoin/bitcoin/issues/21995 | build: Make built dependency packages reproducible by hebasto · Pull Request #21995 · bitcoin/bitcoin · GitHub
03:13 < laanwj> if it helps detect non-determinism in dependencies earlier in the process that would be very useful
03:14 < hebasto> that it's its goal
03:14 < laanwj> staring at the final binary makes attribution harder
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--- Log closed Sun Dec 19 00:00:05 2021