Re: [REGRESSION] Backspace no longer works in host/rootfs make run virtiocon0

[Alyssa Ross <hi@alyssa.is>]

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Alyssa Ross <hi@alyssa.is> writes:

> Alyssa Ross <hi@alyssa.is> writes:
>
>> Alyssa Ross <hi@alyssa.is> writes:
>>
>>> Bisected to the following range:
>>>
>>> 1e9c681 lib/nixpkgs.default.nix: update to nixos-unstable-small
>>> f41b4ab tools: move lsvm out of subdirectory
>>> 5ad749b tools: enable clippy::ptr-as-ptr lint
>>> a4d7aa9 tools: enable clippy::map-unwrap-or lint
>>> 3451250 host/rootfs: group VMM-backing services
>>> 99f09ab pkgs: remove dbus overlay
>>>
>>> Most likely something in the Nixpkgs upgrade.  Needs further bisection.
>>
>> 1e9c6812b7497743a8473d5eb327c26c53cfbef2 is the first bad commit
>> commit 1e9c6812b7497743a8473d5eb327c26c53cfbef2
>> Author: Alyssa Ross <hi@alyssa.is>
>> Date:   Sat Nov 22 13:13:28 2025 +0100
>>
>>     lib/nixpkgs.default.nix: update to nixos-unstable-small
>>     
>>     Signed-off-by: Alyssa Ross <hi@alyssa.is>
>>
>>  lib/nixpkgs.default.nix | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> So needs a Nixpkgs bisect.
>
> # bad: [2ac8b8ee243d52c2a4b429307c23fb72cac43a5c] gitlab-runner: apply patch for file variable handling (#463714)
> # good: [b549734f6b3ec54bb9a611a4185d11ee31f52ee1] codex: 0.56.0 -> 0.57.0 (#460287)
> git bisect start '2ac8b8ee243d52c2a4b429307c23fb72cac43a5c' 'b549734f6b3ec54bb9a611a4185d11ee31f52ee1'
> # good: [ccea08b7b36a1b1388c174d5b8398fcbb0bdb757] Merge master into staging-nixos
> git bisect good ccea08b7b36a1b1388c174d5b8398fcbb0bdb757
> # good: [ccea08b7b36a1b1388c174d5b8398fcbb0bdb757] Merge master into staging-nixos
> git bisect good ccea08b7b36a1b1388c174d5b8398fcbb0bdb757
> # bad: [6db9eed557c922da1e7dc287726e6e492ef24326] python313Packages.langchain: fix build (#461518)
> git bisect bad 6db9eed557c922da1e7dc287726e6e492ef24326
> # good: [1a41aa87c3f40f7493b3e4da391b2ff3af9ffb24] linux_6_17: 6.17.7 -> 6.17.8
> git bisect good 1a41aa87c3f40f7493b3e4da391b2ff3af9ffb24
> # bad: [14dc5ea9de0e8745374ecbdc6916e3c85b15e4e3] staging-nixos merge for 2025-11-14 (#461577)
> git bisect bad 14dc5ea9de0e8745374ecbdc6916e3c85b15e4e3
> # good: [c4d1151093af5d483d1900d9214a65e68bc21560] flutterPackages-source: clean (#460613)
> git bisect good c4d1151093af5d483d1900d9214a65e68bc21560
>
> Most likely looking remaining candidate is 6725ca2dabdd ("gtk3: 3.24.50 → 3.24.51").
>
> I also found https://gitlab.com/qemu-project/qemu/-/issues/3191, which
> looks like the same thing.  Doesn't look like there's a patch yet.  I'll
> continue with the bisect in case it helps them to have the specific
> change that caused the regression.

Surprisingly I can reproduce on that commit's parent, so it's not the
gtk3 upgrade.  Glib upgrade, maybe?

# bad: [6725ca2dabdd4b50c78ec0186fc7b0cd477c632d] gtk3: 3.24.50 → 3.24.51
git bisect bad 6725ca2dabdd4b50c78ec0186fc7b0cd477c632d
# bad: [b0dc74cac643509650c2cdacbe7a18e2337520a0] gtk4: 4.20.0 → 4.20.2
git bisect bad b0dc74cac643509650c2cdacbe7a18e2337520a0
# good: [16db70aea3e6af351e8ad4c217745ec67d46c8ca] rusty-path-of-building: 0.2.6 -> 0.2.7 (#457937)
git bisect good 16db70aea3e6af351e8ad4c217745ec67d46c8ca

>>> To reproduce:
>>>
>>> cd host/rootfs
>>> nix-shell --run 'make clean && make run'
>>> View → virtiocon0
>>> Wait for kernel messages to finish
>>> Try typing, see that backspace doesn't work

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