Can you try again now? I restarted fedmsg-hub on mbs-backend01.

I did:

$ fedpkg module-build-cancel  4106    
Cancelling module build #4106...
The module build #4106 was cancelled
$ fedpkg module-build-info  4106  
Name:           openmpi
Stream:         3.1
Version:        2920190428195227
Koji Tag:       module-openmpi-3.1-2920190428195227-6c81f848
Owner:          orion
State:          failed
State Reason:   Canceled by orion.
Time Submitted: 2019-04-28T19:52:50Z
Time Completed: 2019-04-29T01:52:40Z
Components:
    Name:       openmpi
    NVR:        None
    State:      FAILED
    Koji Task:
    Name:       module-build-macros
    NVR:        module-build-macros-0.1-1.module_f29+4106+88ea097c
    State:      COMPLETE
    Koji Task:  https://koji.fedoraproject.org/koji/taskinfo?taskID=34514799
$ fedpkg module-build
Submitting the module build...
The builds 4105, 4106, 4107 and 4108 were submitted to the MBS
$ fedpkg module-build-info  4106
Name:           openmpi
Stream:         3.1
Version:        2920190428195227
Koji Tag:       module-openmpi-3.1-2920190428195227-6c81f848
Owner:          orion
State:          build
State Reason:   Resubmitted by orion
Time Submitted: 2019-04-28T19:52:50Z
Time Completed: 2019-04-29T01:52:40Z
Components:
    Name:       openmpi
    NVR:        None
    State:      undefined
    Koji Task:
    Name:       module-build-macros
    NVR:        module-build-macros-0.1-1.module_f29+4106+88ea097c
    State:      COMPLETE
    Koji Task:  https://koji.fedoraproject.org/koji/taskinfo?taskID=34514799

@jkaluza Can you look?

I did:
$ fedpkg module-build-cancel 4106
Cancelling module build #4106...
The module build #4106 was cancelled
$ fedpkg module-build-info 4106
Name: openmpi
Stream: 3.1
Version: 2920190428195227
Koji Tag: module-openmpi-3.1-2920190428195227-6c81f848
Owner: orion
State: failed
State Reason: Canceled by orion.
Time Submitted: 2019-04-28T19:52:50Z
Time Completed: 2019-04-29T01:52:40Z
Components:
Name: openmpi
NVR: None
State: FAILED
Koji Task:

Name: module-build-macros
NVR: module-build-macros-0.1-1.module_f29+4106+88ea097c
State: COMPLETE
Koji Task: https://koji.fedoraproject.org/koji/taskinfo?taskID=34514799

$ fedpkg module-build
Submitting the module build...
The builds 4105, 4106, 4107 and 4108 were submitted to the MBS
$ fedpkg module-build-info 4106
Name: openmpi
Stream: 3.1
Version: 2920190428195227
Koji Tag: module-openmpi-3.1-2920190428195227-6c81f848
Owner: orion
State: build
State Reason: Resubmitted by orion
Time Submitted: 2019-04-28T19:52:50Z
Time Completed: 2019-04-29T01:52:40Z
Components:
Name: openmpi
NVR: None
State: undefined
Koji Task:

Name: module-build-macros
NVR: module-build-macros-0.1-1.module_f29+4106+88ea097c
State: COMPLETE
Koji Task: https://koji.fedoraproject.org/koji/taskinfo?taskID=34514799

I know it's not ideal, but you could cancel the build, bump the git commit of the modulemd file, and then submit, if you're still having issues. It's likely MBS didn't handle the "too many files open" error gracefully and is in a weird state.

@orion any luck with what @mprahl said there?

I see a successfull build here: https://release-engineering.github.io/mbs-ui/module/4108

So, closing this... if there's still an issue or further action is needed, please let us know.