gchristensen changed the topic of #nixos-dev to: NixOS Development (#nixos for questions) | https://hydra.nixos.org/jobset/nixos/trunk-combined https://channels.nix.gsc.io/graph.html | 18.09 release managers: vcunat and samueldr | https://logs.nix.samueldr.com/nixos-dev
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<samueldr> hey maintainer friends, nixos-unstable is being held back by sd-image-aarch64 not building due to the zfs modules not building for linux 4.20
<samueldr> #52863 and #52886 once merged will resolve that situation
<{^_^}> https://github.com/NixOS/nixpkgs/pull/52863 (by samueldr, 4 hours ago, open): Switch default linux package to the new LTS, 4.19
<{^_^}> https://github.com/NixOS/nixpkgs/pull/52886 (by samueldr, 1 minute ago, open): sd-image-aarch64: use default (LTS) kernel
<samueldr> I'm letting it simmer for a couple hourse, will probably merge the pair in 2-3 hours as I'm thinking the first one is a almost overdue, and the second one should be fine
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<ivan> I've been running 4.19 on my hydra machine for a while, haven't had problems
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<joko> samueldr: I think that zfs stable is not working with 4.19
<joko> stable as in 0.7.12
<joko> Besides this, I am using 4.19 on systems without zfs and it is working as intented
<joko> Hmm, I might be wrong, zfs 0.7.12 might work with 4.19 according to the releases page (https://github.com/zfsonlinux/zfs/releases)
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<domenkozar> samueldr: bumping kernel seems best
<joko> And it is working with ZFS stable, so I also agree on this
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<ekleog> is it only me or are all the tests broken on master? I get some kernel panic
<ekleog> (init: operation not permitted, to be exact, won't have time to investigate soon, though :/)
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<samueldr> domenkozar: it wasn't about not-bumping kernel, but "did I miss anything?" :)
<samueldr> thanks for the merges (I didn't since there was that unresolved discussion)
<domenkozar> ekleog: master, what commit?
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<samueldr> seems like master right now, and the 4.14 -> 4.19 change :(
<samueldr> currently investigating
<samueldr> seems like the overlayfs at switch_root isn't readable in stage-1
<samueldr> though the underlying fs is
<samueldr> same happens in 18.09 when switching to 4.19, so it seems to be specific to the kernel change and possibly not a mix of multiple changes
<samueldr> 4.18 works, so it's fewer releases to bisect through :/
<samueldr> :/ 4.20 doesn't have a fix apparently
<domenkozar> aszlig provided a patch
<samueldr> (I'm saying that only by having executed the tests with 4.20)
<domenkozar> not sure why just include that when building the kernel
<samueldr> yeah, I saw
<samueldr> no idea, I'm not a kernel expert, maybe there are drawbacks?
<domenkozar> I think we should just apply the patch to 4.19 and 4.20 until upstream takes care
<aszlig> samueldr: well, the problem is that the internal handling of the vfs dispatch function for overlayfs has changed
<domenkozar> aszlig: is there any drawbacks applying the patch to 4.19 by default?
<samueldr> yeah I looked at the 4.19 changes and saw there was a big bullet point for overlayfs
<samueldr> though thankfully someone who knows what they're doing already had a look at the issue :)
<aszlig> samueldr: the revert should in theory be without issues
<aszlig> the big question is however: why does this happen?
<aszlig> i haven't been able to reproduce it so far
<samueldr> aszlig: do you have a link to the mailing list where you sent the report? I would add it with the patch so we'd know why the patch was added
<aszlig> reproduce on non-nixos of course
<samueldr> oooh, THAT was what you wanted the other day
<aszlig> ah, which patch?
<samueldr> aszlig: could it be a combination with 9p fs specifically&
<samueldr> I'm looking if CONFIG_OVERLAY_FS_INDEX is related
<samueldr> (though as I said, I'm no expert, twiddling knobs until it works here, then trying to understand after)
<aszlig> samueldr: unfortunately not...
<aszlig> it has something to do with the interaction between the host and the guest though...
<samueldr> well, good to know
<samueldr> oh, unfortunately not 9p or unfortunately not CONFIG_OVERLAY_FS_INDEX?
<aszlig> 9p
<aszlig> i tested it with sshfs instead
<aszlig> and it has the same issue
<samueldr> ah, good to know
<aszlig> so far i've sent it just to the maintainer but i wanted to do a follow-up post on the mailinglist once i can reproduce it on non-nixos
<samueldr> aszlig: sorry to task again, but do you have a link for the report you did upstream?
<samueldr> ok
<aszlig> samueldr: maybe i'll post it to the mailinglist anyway and give instructions on how to reproduce it with nix
<aszlig> i'm going to 35c3 these days and thus might be offline for a while, so others can work on this in the meantime
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<samueldr> for those playing at home, CONFIG_OVERLAY_FS_INDEX doesn't help
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<aszlig> samueldr: yeah, if you dig through the code it's completely unrelated to the problem
<samueldr> yep, I was just reporting back since I earlier said I was testing with it enabled
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<samueldr> thanks domenkozar
<samueldr> (restarted eval of trunk-combined, crossed fingers)
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