Openblas-i686-linux hangs in checkPhase on zblat3

b1tflyyyy · June 23, 2026, 2:28pm

I’m updating nixpkgs and hit a hang in openblas-i686-linux during the test phase.
The build reaches checkPhase, starts ctest, and then gets stuck forever on zblat3:

openblas-i686-linux> [100%] Built target xzcblat3_3m
openblas-i686-linux> buildPhase completed in 3 minutes 54 seconds
openblas-i686-linux> Running phase: checkPhase
openblas-i686-linux> check flags: SHELL=/nix/store/r1jcyifbfnvrxk67ifvwx8ysx7r7jgfi-bash-5.3p9/bin/bash VERBOSE=y test
openblas-i686-linux> Running tests...
openblas-i686-linux> /nix/store/mgvw77gvbc5kmv5rbrxhqfhqiq2qdpvk-cmake-4.1.2/bin/ctest
openblas-i686-linux> Test project /build/source/build
openblas-i686-linux>       Start  1: openblas_utest
openblas-i686-linux>       Start  2: openblas_utest_ext
openblas-i686-linux>       Start  3: sblas1
openblas-i686-linux>       Start  4: sblas2
openblas-i686-linux>       Start  5: sblas3
openblas-i686-linux>       Start  6: dblas1
openblas-i686-linux>       Start  7: dblas2
openblas-i686-linux>       Start  8: dblas3
openblas-i686-linux>       Start  9: cblas1
openblas-i686-linux>       Start 10: cblas2
openblas-i686-linux>       Start 11: cblas3
openblas-i686-linux>       Start 12: cblas3_3m
openblas-i686-linux>       Start 13: zblas1
openblas-i686-linux>       Start 14: zblas2
openblas-i686-linux>       Start 15: zblas3
openblas-i686-linux>       Start 16: zblas3_3m
openblas-i686-linux>  1/30 Test  #1: openblas_utest ...................   Passed    0.03 sec
openblas-i686-linux>  2/30 Test  #2: openblas_utest_ext ...............   Passed    0.02 sec
openblas-i686-linux>  3/30 Test  #3: sblas1 ...........................   Passed    0.02 sec
openblas-i686-linux>  4/30 Test  #6: dblas1 ...........................   Passed    0.02 sec
openblas-i686-linux>  5/30 Test  #9: cblas1 ...........................   Passed    0.02 sec
openblas-i686-linux>  6/30 Test #13: zblas1 ...........................   Passed    0.01 sec
openblas-i686-linux>       Start 17: xscblat1
openblas-i686-linux>       Start 18: xscblat2
openblas-i686-linux>       Start 19: xscblat3
openblas-i686-linux>       Start 20: xdcblat1
openblas-i686-linux>       Start 21: xdcblat2
openblas-i686-linux>       Start 22: xdcblat3
openblas-i686-linux>  7/30 Test #17: xscblat1 .........................   Passed    0.01 sec
openblas-i686-linux>  8/30 Test #20: xdcblat1 .........................   Passed    0.00 sec
openblas-i686-linux>       Start 23: xccblat1
openblas-i686-linux>       Start 24: xccblat2
openblas-i686-linux>  9/30 Test #23: xccblat1 .........................   Passed    0.00 sec
openblas-i686-linux>       Start 25: xccblat3
openblas-i686-linux> 10/30 Test #16: zblas3_3m ........................   Passed    0.10 sec
openblas-i686-linux>       Start 26: xccblat3_3m
openblas-i686-linux> 11/30 Test #25: xccblat3 .........................   Passed    0.09 sec
openblas-i686-linux>       Start 27: xzcblat1
openblas-i686-linux> 12/30 Test  #8: dblas3 ...........................   Passed    0.12 sec
openblas-i686-linux>       Start 28: xzcblat2
openblas-i686-linux> 13/30 Test #27: xzcblat1 .........................   Passed    0.01 sec
openblas-i686-linux>       Start 29: xzcblat3
openblas-i686-linux> 14/30 Test  #5: sblas3 ...........................   Passed    0.18 sec
openblas-i686-linux>       Start 30: xzcblat3_3m
openblas-i686-linux> 15/30 Test #12: cblas3_3m ........................   Passed    0.18 sec
openblas-i686-linux> 16/30 Test #26: xccblat3_3m ......................   Passed    0.07 sec
openblas-i686-linux> 17/30 Test #30: xzcblat3_3m ......................   Passed    0.54 sec
openblas-i686-linux> 18/30 Test #11: cblas3 ...........................   Passed   11.37 sec
openblas-i686-linux> 19/30 Test #22: xdcblat3 .........................   Passed   21.70 sec
openblas-i686-linux> 20/30 Test #19: xscblat3 .........................   Passed   24.19 sec
openblas-i686-linux> 21/30 Test #29: xzcblat3 .........................   Passed   34.47 sec
openblas-i686-linux> 22/30 Test  #4: sblas2 ...........................   Passed  101.74 sec
openblas-i686-linux> 23/30 Test  #7: dblas2 ...........................   Passed  103.56 sec
openblas-i686-linux> 24/30 Test #14: zblas2 ...........................   Passed  111.13 sec
openblas-i686-linux> 25/30 Test #10: cblas2 ...........................   Passed  113.04 sec
openblas-i686-linux> 26/30 Test #18: xscblat2 .........................   Passed  152.21 sec
openblas-i686-linux> 27/30 Test #21: xdcblat2 .........................   Passed  154.65 sec
openblas-i686-linux> 28/30 Test #24: xccblat2 .........................   Passed  158.46 sec
openblas-i686-linux> 29/30 Test #28: xzcblat2 .........................   Passed  158.44 sec

┏━ Dependency Graph:
┃                         ┌─ ⏵ openblas-0.3.33-i686-linux (checkPhase) ⏱️ 1h55m54s
┃                      ┌─ ⏸️ lapack-3-i686-linux
┃                   ┌─ ⏸️ python3.13-numpy-2.4.4-i686-linux
┃                ┌─ ⏸️ python3.13-pybind11-3.0.4-i686-linux
┃             ┌─ ⏸️ libcamera-0.7.0-i686-linux
┃          ┌─ ⏸️ pipewire-1.6.5-i686-linux
┃       ┌─ ⏸️ etc-alsa-conf.d-49-pipewire-modules.conf
┃    ┌─ ⏸️ etc
┃ ┌─ ⏸️ activate
┃ ⏸️ nixos-system-ok-26.05.20260622.3426825
┣━━━ Builds
┗━ ∑ ⏵ 1 │ ✔️ 0 │ ⏸️ 18 │ ⏱️ 1h55m58s

This happens while building openblas-i686-linux on an x86_64-linux host (no qemu/emulation involved).

$ nix-shell -p nix-info --run "nix-info -m"

- system: `"x86_64-linux"`
- host os: `Linux 7.0.12-zen1, NixOS, 26.05 (Yarara), 26.05.20260618.e8210c6`
- multi-user?: `yes`
- sandbox: `yes`
- version: `nix-env (Nix) 2.34.7`
- nixpkgs: `/nix/store/zny1nwmq6v9bkmjgpqrgngy7n7653mfh-source`

Has anyone seen this before? Is this a known issue with recent OpenBLAS releases or with the i686-linux build in nixpkgs?

_Andrew · June 23, 2026, 6:03pm

Also started seeing this today. Disabling services.pipewire.alsa.support32Bit works around it.

configuration

$ nix-shell --packages 'nix-info' --run 'nix-info --markdown'
- system: `"x86_64-linux"`
- host os: `Linux 6.18.36, NixOS, 26.05 (Yarara), 26.05.3021.34268251cf55`
- multi-user?: `yes`
- sandbox: `yes`
- version: `nix-env (Nix) 2.34.7`
- channels(root): `"nix-math, nixos-26.05, nixos-hardware, nixseparatedebuginfod, unstable"`
- nixpkgs: `/nix/store/bsbcrmaj6fi83v0a463x7fn6nbja2k00-nixos-26.05/nixos`

sircam · June 24, 2026, 1:57am

Damn, I’m living the same pain. I just aborted everything; I will not run updates until this gets addressed.

zevisert · June 24, 2026, 3:46am

Also experiencing this; the hanging ctest is zblas3 not zblat3 (typo’d). My CPU was hovering around 97% while other tests ran, and when everything except zblas3 completed it went back to idle, so maybe it’s a deadlock in the test for this build?

See also: Build failure: openblas · Issue #534670 · NixOS/nixpkgs · GitHub

klt · June 24, 2026, 1:43pm

 - system: `"x86_64-linux"`
 - host os: `Linux 7.0.12, NixOS, 26.05 (Yarara), 26.05.2462.e8210c649915`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.34.7`
 - channels(root): `"home-manager-26.05.tar.gz, nixos-26.05"`
 - nixpkgs: `/nix/store/bsbcrmaj6fi83v0a463x7fn6nbja2k00-nixos-26.05/nixos`

I might have the same problem but I am not sure.
The command

sudo nixos-rebuild switch --no-build-output --show-trace --upgrade-all

is hanging with the following output for several hours by now:

building '/nix/store/4jl3x3ffc44sghhxxs08ilvjh7npb1y9-user-units.drv'...

nmon shows that the following process is using just 1 core but to almost 100%:

Top Processes Procs=347-mode=3-1=Base 3=Perf 4=Size 5=I/O[RootOnly] u=Args
 PID    %CPU  Size   Res   Res   Res   Res Shared   Faults  Command
        Used    KB   Set  Text  Data   Lib    KB  Min  Maj
  68071  99.7   331m 7536    80   297m    0  5440    0    0 zblat3
   3543   1.6   911m  277m 2888   514m    0 88240  109    0 emacs
   ....

How do I check which package is currently being built?

b1tflyyyy · June 24, 2026, 3:34pm

It’s fixed:

github.com/NixOS/nixpkgs

Build failure: openblas

opened 05:14PM - 23 Jun 26 UTC

closed 12:52PM - 24 Jun 26 UTC

Nivalux

0.kind: build failure

### Nixpkgs version - Stable (26.05) ### Steps to reproduce Update to the lat…est version of nixpkgs-26.05 (of today) and rebuild the system (with pipewire enabled). It builds `openblas-0.3.33-i686-linux`, which is the 32bit version, which seems not to be cached or build in hydra, if I saw correctly. For context: I daily update the nixpkgs-26.05 branch and today it seems there where big changes, since it downloaded 2000+ packages and build some on my machine. It also build openblas, for the first time on my machine. (It has never built that before on my system) The build does not "fail" per se, but the test does not finish running, even after 1h20m. It does report 100% CPU usage for 1 core for the entire time. ### Can Hydra reproduce this build failure? Hydra doesn’t try to build the package. ### Link to Hydra build job _No response_ ### Relevant log output ```console openblas> 1/30 Test #1: openblas_utest ................... Passed 0.04 sec openblas> 2/30 Test #2: openblas_utest_ext ............... Passed 0.04 sec openblas> 3/30 Test #3: sblas1 ........................... Passed 0.04 sec openblas> 4/30 Test #6: dblas1 ........................... Passed 0.03 sec openblas> 5/30 Test #9: cblas1 ........................... Passed 0.03 sec openblas> 6/30 Test #13: zblas1 ........................... Passed 0.03 sec openblas> 7/30 Test #17: xscblat1 ......................... Passed 0.02 sec openblas> 8/30 Test #20: xdcblat1 ......................... Passed 0.01 sec openblas> Start 25: xccblat3 openblas> Start 26: xccblat3_3m openblas> Start 27: xzcblat1 openblas> Start 28: xzcblat2 openblas> Start 29: xzcblat3 openblas> Start 30: xzcblat3_3m openblas> 9/30 Test #23: xccblat1 ......................... Passed 0.01 sec openblas> 10/30 Test #27: xzcblat1 ......................... Passed 0.00 sec openblas> 11/30 Test #26: xccblat3_3m ...................... Passed 0.05 sec openblas> 12/30 Test #25: xccblat3 ......................... Passed 0.06 sec openblas> 13/30 Test #12: cblas3_3m ........................ Passed 0.11 sec openblas> 14/30 Test #8: dblas3 ........................... Passed 0.11 sec openblas> 15/30 Test #5: sblas3 ........................... Passed 0.21 sec openblas> 16/30 Test #16: zblas3_3m ........................ Passed 0.27 sec openblas> 17/30 Test #30: xzcblat3_3m ...................... Passed 0.35 sec openblas> 18/30 Test #11: cblas3 ........................... Passed 16.20 sec openblas> 19/30 Test #19: xscblat3 ......................... Passed 23.87 sec openblas> 20/30 Test #22: xdcblat3 ......................... Passed 33.68 sec openblas> 21/30 Test #29: xzcblat3 ......................... Passed 51.95 sec openblas> 22/30 Test #4: sblas2 ........................... Passed 147.00 sec openblas> 23/30 Test #7: dblas2 ........................... Passed 154.31 sec openblas> 24/30 Test #10: cblas2 ........................... Passed 156.24 sec openblas> 25/30 Test #14: zblas2 ........................... Passed 162.04 sec openblas> 26/30 Test #18: xscblat2 ......................... Passed 217.45 sec openblas> 27/30 Test #21: xdcblat2 ......................... Passed 225.19 sec openblas> 28/30 Test #24: xccblat2 ......................... Passed 230.12 sec openblas> 29/30 Test #28: xzcblat2 ......................... Passed 230.21 sec ┏━ Dependency Graph: ┃ ┌─ ✔ etc-nix-registry.json ┃ ├─ ✔ user-environment ┃ │ ┌─ ⏸ python3-3.13.13-env-i686-linux waiting for 1 ⏵ 3 ⏸ ┃ │ ┌─ ⏸ ffado-2.4.9-i686-linux ┃ │ │ ┌─ ⏸ python3.13-pybind11-3.0.4-i686-linux waiting for 1 ⏵ 4 ⏸ ┃ │ ├─ ⏸ libcamera-0.7.0-i686-linux ┃ │ │ ┌─ ⏸ site.cfg-i686-linux waiting for 1 ⏵ 1 ⏸ ┃ │ │ ├─ ⏸ blas-3-i686-linux waiting for 1 ⏵ ┃ │ │ │ ┌─ ⏵ openblas-0.3.33-i686-linux ⏱ 1h21m42s ┃ │ │ ├─ ⏸ lapack-3-i686-linux ┃ │ │ ┌─ ⏸ python3.13-numpy-2.4.4-i686-linux ┃ │ │ ┌─ ⏸ python3.13-pandas-2.3.3-i686-linux ┃ │ │ ┌─ ⏸ python3.13-pyfakefs-6.0.0-i686-linux ┃ │ │ ┌─ ⏸ python3.13-distutils-80.10.1-i686-linux ┃ │ │ ┌─ ⏸ scons-4.10.1-i686-linux ┃ │ ├─ ⏸ roc-toolkit-0.4.0-i686-linux ┃ │ ┌─ ⏸ pipewire-1.6.5-i686-linux ┃ ├─ ⏸ etc-alsa-conf.d-49-pipewire-modules.conf ``` ### Additional context <img width="689" height="788" alt="Image" src="https://github.com/user-attachments/assets/da6f3313-4ec2-43c4-83f1-644d592571e7" /> ### System metadata - system: `"x86_64-linux"` - host os: `Linux 7.0.12, NixOS, 26.05 (Yarara), 26.05.20260611.a037402` - multi-user?: `yes` - sandbox: `yes` - version: `nix-env (Nix) 2.34.7` - nixpkgs: `/nix/store/zx3v86x9xyh8jvac5zg6px9gkg9v0igq-source` ### Notify maintainers @ttuegel --- **Note for maintainers:** Please tag this issue in your pull request description. (i.e. `Resolves #ISSUE`.) ### I assert that this issue is relevant for Nixpkgs - [x] I assert that this is a bug and not a support request. - [x] I assert that this is not a [duplicate of an existing issue](https://github.com/NixOS/nixpkgs/issues?q=is%3Aissue+label%3A%220.kind%3A+build+failure%22). - [x] I assert that I have read the [NixOS Code of Conduct](https://github.com/NixOS/.github/blob/master/CODE_OF_CONDUCT.md) and agree to abide by it. - [x] I assert that I have read the [automation/AI policy](https://github.com/NixOS/nixpkgs/blob/master/CONTRIBUTING.md#automationai-policy) and that this issue report complies with it. ### Is this issue important to you? Add a :+1: [reaction] to [issues you find important]. [reaction]: https://github.blog/2016-03-10-add-reactions-to-pull-requests-issues-and-comments/ [issues you find important]: https://github.com/NixOS/nixpkgs/issues?q=is%3Aissue+is%3Aopen+sort%3Areactions-%2B1-desc

_Andrew · June 24, 2026, 3:40pm

nix-top or nix-output-monitor

Nivalux · June 24, 2026, 3:59pm

I use nom to see the progress while building.
I build first, since that can be run without sudo and only afterwards run switch with sudo.

In your case that would be:

nixos-rebuild build --print-build-logs |& nom
if [ -L ./result ]; then
nvd diff /run/current-system ./result
fi
sudo nixos-rebuild switch

–
For that you need those packages installed:
pkgs.nvd
pkgs.nix-output-monitor

sircam · June 24, 2026, 4:08pm

Based on the upstream comment, the Nix team is aware this is a band-aid.

doCheck = true;
# FIXME: this broke some time between a0374025a863d007d98e3297f6aa46cc3141c2f0 and 34268251cf5547d39063f2c5ea9a196246f7f3a6
This just serves to unbreak stable
doCheck = stdenv.hostPlatform.system != “i686-linux”;

AliSot2000 · June 24, 2026, 5:22pm

Hi everyone

I’m also experiencing this issue while upgrading my system from 25.11 to 26.05 although I’m running on a x86_64 machine.

  CPU op-mode(s):            32-bit, 64-bit
  Address sizes:             43 bits physical, 48 bits virtual
  Byte Order:                Little Endian
CPU(s):                      16
  On-line CPU(s) list:       0-15
Vendor ID:                   AuthenticAMD
  Model name:                AMD Ryzen 7 3700X 8-Core Processor
    CPU family:              23
    Model:                   113
    Thread(s) per core:      2
    Core(s) per socket:      8
    Socket(s):               1
    Stepping:                0
    Frequency boost:         enabled
    CPU(s) scaling MHz:      82%
    CPU max MHz:             4426.0000
    CPU min MHz:             550.0000
    BogoMIPS:                7199.76
...

NobbZ · June 24, 2026, 5:40pm

Either you explicitly enabled 32bit alsa, or you enabled steam.

noxymoto · June 25, 2026, 1:14am

Has this been resolved? I tried some of these fixes and have gotten the same issue on retry.

sircam · June 25, 2026, 4:17am

There’s a temporary fix on the way

AliSot2000 · June 25, 2026, 4:23pm

Was the 32bit Alsa

klt · June 27, 2026, 7:25am

Build works again
Thanks for your work.