runtime panic of kraft

[yunchih]

Describe the bug

Under the example helloworld-c of application catalog, kraft crashes.

root@d1f93b7d424e:/tmp/helloworld-c# kraft run --rm --plat qemu --arch x86_64 .
[+] pulling unikraft.org/base:latest (qemu/x86_64) ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 100% [8.2s]
 i  using arch=x86_64 plat=qemu
Caught panic:

runtime error: invalid memory address or nil pointer dereference

Restoring terminal...

goroutine 4914 [running]:
runtime/debug.Stack()
        /usr/local/go/src/runtime/debug/stack.go:26 +0x5e
runtime/debug.PrintStack()
        /usr/local/go/src/runtime/debug/stack.go:18 +0x13
github.com/charmbracelet/bubbletea.(*Program).recoverFromPanic(0xc000e3c280)
        /github/home/go/pkg/mod/github.com/charmbracelet/bubbletea@v1.3.3/tea.go:733 +0x8b
panic({0x29afda0?, 0x4b44dd0?})
        /usr/local/go/src/runtime/panic.go:787 +0x132
kraftkit.sh/initrd.(*dockerfile).Build.func2()
        /__w/kraftkit/kraftkit/initrd/dockerfile.go:351 +0x2a
panic({0x29afda0?, 0x4b44dd0?})
        /usr/local/go/src/runtime/panic.go:787 +0x132
kraftkit.sh/initrd.(*dockerfile).Build(0xc0044066c0, {0x330a1b8, 0xc002d12600})
        /__w/kraftkit/kraftkit/initrd/dockerfile.go:369 +0xa04
kraftkit.sh/internal/cli/kraft/run.(*RunOptions).prepareRootfs.func1({0x330a1b8?, 0xc002d12600?})
        /__w/kraftkit/kraftkit/internal/cli/kraft/run/utils.go:398 +0x4f
kraftkit.sh/tui/processtree.(*ProcessTree).Init.(*ProcessTree).waitForProcessCmd.func2()
        /__w/kraftkit/kraftkit/tui/processtree/processtree.go:334 +0x117
github.com/charmbracelet/bubbletea.(*Program).handleCommands.func1.1()
        /github/home/go/pkg/mod/github.com/charmbracelet/bubbletea@v1.3.3/tea.go:348 +0x7d
created by github.com/charmbracelet/bubbletea.(*Program).handleCommands.func1 in goroutine 4909
        /github/home/go/pkg/mod/github.com/charmbracelet/bubbletea@v1.3.3/tea.go:342 +0x131
 E  program was killed: context canceled

Steps to reproduce

Run inside qemu container:

docker run -it --name qemu -v $(pwd)/unikraft-catalog:/unikraft --entrypoint /bin/bash qemux/qemu
# install kraft using curl ...
# copy the helloworld-c to tmp
kraft run --rm --plat qemu --arch x86_64 .

KraftKit version

kraft 0.11.5 (fb79ed2) go1.24.0 2025-03-10T15:41:21Z

[craciunoiuc]

Hey, it looks like you are trying to use docker in that container by trying to build a Dockerfile. Do you have it installed?

Meanwhile will keep this issue open, as we clearly need to catch the case where someone has no sort of Docker installed.

[nderjung]

Hi @yunchih please can you indicate which version of kraft you are using.

[yunchih]

Hi @yunchih please can you indicate which version of kraft you are using.

kraft 0.11.5 (fb79ed2) go1.24.0 2025-03-10T15:41:21Z

[craciunoiuc]

@yunchih Did you retry this since then? Maybe you can retry with the latest staging version

https://github.com/unikraft/kraftkit/releases/tag/untagged-987dc1880db42e5e30dd

[koalazub]

I've tried:

kraft 0.11.6 (caf53eec6c723d7b2c5c2cac257e6db17f185f09) go1.24.0 2025-04-01T08:10:57Z

Here are the errors:

kraft build
<!> a fatal error occurred: interface conversion: interface {} is []interface {}, not map[string]interface {}
 E  goroutine 1 [running]:
 E  runtime/debug.Stack()
 E      /usr/local/go/src/runtime/debug/stack.go:26 +0x64
 E  kraftkit.sh/internal/cli/kraft.Main.func2()
 E      /__w/kraftkit/kraftkit/internal/cli/kraft/kraft.go:241 +0xd4
 E  panic({0x1062bf100?, 0x140004f0000?})
 E      /usr/local/go/src/runtime/panic.go:787 +0x124
 E  kraftkit.sh/unikraft/app.getSectionMap(...)
 E      /__w/kraftkit/kraftkit/unikraft/app/loader.go:145
 E  kraftkit.sh/unikraft/app.NewApplicationFromInterface({0x10667bdd8, 0x14000615e00}, 0x14000638c60, 0x1400080c0c0)
 E      /__w/kraftkit/kraftkit/unikraft/app/loader.go:110 +0xa00
 E  kraftkit.sh/unikraft/app.NewProjectFromOptions({0x10667bdd8, 0x140006383f0}, {0x1400010e580?, 0x0?, 0x1062686e0?})
 E      /__w/kraftkit/kraftkit/unikraft/app/project.go:130 +0x430
 E  kraftkit.sh/internal/cli/kraft/build.(*BuildOptions).initProject(0x14000308a00, {0x10667bdd8, 0x140006383f0})
 E      /__w/kraftkit/kraftkit/internal/cli/kraft/build/utils.go:34 +0x250
 E  kraftkit.sh/internal/cli/kraft/build.(*builderKraftfileUnikraft).Buildable(0x140008a5e80?, {0x10667bdd8, 0x140006383f0}, 0x14000308a00, {0x1400010e570?, 0x1046e103c?, 0x106654a90?})
 E      /__w/kraftkit/kraftkit/internal/cli/kraft/build/builder_kraftfile_unikraft.go:47 +0x3c
 E  kraftkit.sh/internal/cli/kraft/build.Build({0x10667bdd8, 0x140006383f0}, 0x2000?, {0x1078efee0, 0x0, 0x0})
 E      /__w/kraftkit/kraftkit/internal/cli/kraft/build/build.go:94 +0x260
 E  kraftkit.sh/internal/cli/kraft/build.(*BuildOptions).Run(0x14000308a00, {0x10667bdd8, 0x140006383f0}, {0x1078efee0?, 0x0?, 0x0?})
 E      /__w/kraftkit/kraftkit/internal/cli/kraft/build/build.go:188 +0x44
 E  kraftkit.sh/cmdfactory.New.func1(0x14000158908?, {0x1078efee0?, 0x0?, 0x0?})
 E      /__w/kraftkit/kraftkit/cmdfactory/builder.go:371 +0x4c
 E  kraftkit.sh/cmdfactory.AttributeFlags.bind.func3(0x14000158908, {0x1078efee0, 0x0, 0x0})
 E      /__w/kraftkit/kraftkit/cmdfactory/builder.go:553 +0x14c
 E  github.com/spf13/cobra.(*Command).execute(0x14000158908, {0x1078efee0, 0x0, 0x0})
 E      /github/home/go/pkg/mod/github.com/spf13/cobra@v1.9.1/command.go:1015 +0x828
 E  github.com/spf13/cobra.(*Command).ExecuteC(0x14000158308)
 E      /github/home/go/pkg/mod/github.com/spf13/cobra@v1.9.1/command.go:1148 +0x350
 E  github.com/spf13/cobra.(*Command).Execute(...)
 E      /github/home/go/pkg/mod/github.com/spf13/cobra@v1.9.1/command.go:1071
 E  github.com/spf13/cobra.(*Command).ExecuteContext(...)
 E      /github/home/go/pkg/mod/github.com/spf13/cobra@v1.9.1/command.go:1064
 E  kraftkit.sh/cmdfactory.Main({0x10667bdd8, 0x1400076c360}, 0x14000158308)
 E      /__w/kraftkit/kraftkit/cmdfactory/builder.go:183 +0x6c
 E  kraftkit.sh/internal/cli/kraft.Main({0x16b8572f8?, 0x1045e9a68?, 0x1077679d8?})
 E      /__w/kraftkit/kraftkit/internal/cli/kraft/kraft.go:286 +0xb1c
 E  main.main()
 E      /__w/kraftkit/kraftkit/cmd/kraft/main.go:19 +0x94
 E
<!> please consider opening an issue at: https://github.com/unikraft/kraftkit/issues/new?template=bug_report.yml

This was build via: brew install unikraft/cli/kraftkit

I then tried building from source and still got the same issue. Mac details:

ProductName:            macOS
ProductVersion:         26.0
BuildVersion:           25A5295e

I can't run the cli tool at all

[craciunoiuc]

This is separate issue but indeed a problem

@koalazub What were you trying to build?

This looks like an issue in a kraftfile. It's basically complaining that it was expecting a map of things but got an array of things in the yaml

As most things parse the kraftfile it's probably why you get the error in multiple commands

[craciunoiuc]

I will add an explicit check to explain the error, but you'll still have to adjust the kraftfile you're using

[craciunoiuc]

So it looks like you created a list of libraries instead of a map of libraries, as in:

libraries:
- lwip:
- smth:

vs.

libraries:
  lwip:
  smth:

I can try to add a better message but this is still a user error 👀

[koalazub]

This is separate issue but indeed a problem

@koalazub What were you trying to build?

This looks like an issue in a kraftfile. It's basically complaining that it was expecting a map of things but got an array of things in the yaml

As most things parse the kraftfile it's probably why you get the error in multiple commands

Excuse the delayed reply.

I didn't realise that even if you run a kraft command to pull in another kraft image it still looks at a Kraftfile that's present in the current directory.

I just had a hunch and was then able to spot that by changing to another empty directory when running a test Kraft command.
This could be something worth divulging maybe?

[koalazub]

And to your point - yup it was an issue with the underlying Kraftfile I had