docker: Error response from daemon: failed to create task for container: failed to create shim task: OCI runtime create failed: unknown platform: kvm: unknown.

[JADDYK]

Description

I want to start gvisor with KVM. I changed /etc/docker/daeon.json and added "--platform=kvm". My host supports the KVM function which satisfies the Prerequisites in https://gvisor.dev/docs/user_guide/platforms/.

Docker cannot start on my host, so there are no bug logs in /tmp/runsc file. Are there some mistakes in my configuration or gvsior kvm platform? My host can run gvsior with the default platform configuration.

Steps to reproduce

No response

runsc version

runsc version release-20240325.0-19-g7d68056681dd-dirty
spec: 1.1.0-rc.1

docker version (if using docker)

Client: Docker Engine - Community
 Version:           26.0.0
 API version:       1.45
 Go version:        go1.21.8
 Git commit:        2ae903e
 Built:             Wed Mar 20 15:17:48 2024
 OS/Arch:           linux/amd64
 Context:           default

Server: Docker Engine - Community
 Engine:
  Version:          26.0.0
  API version:      1.45 (minimum version 1.24)
  Go version:       go1.21.8
  Git commit:       8b79278
  Built:            Wed Mar 20 15:17:48 2024
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.6.28
  GitCommit:        ae07eda36dd25f8a1b98dfbf587313b99c0190bb
 runc:
  Version:          1.1.12
  GitCommit:        v1.1.12-0-g51d5e94
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

uname

Linux ubuntu 6.5.0-26-generic #26~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue Mar 12 10:22:43 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

kubectl (if using Kubernetes)

No response

repo state (if built from source)

7d68056

runsc debug logs (if available)

No response

[Ayush Ranjan]

Docker cannot start on my host, so there are no bug logs in /tmp/runsc file.

Are you passing a --debug-log= flag? Can you pass `--debug-log=/tmp/runsc/" (the trailing forward slash is important). It will create a directory at /tmp/runsc/ and create log files there. https://gvisor.dev/docs/user_guide/debugging/.

[JADDYK]

Oh, I solve the problem. I check the symbol table and find that no kvm symbol.
I import "gvisor.dev/gvisor/pkg/sentry/platform/kvm" in file runsc/boot/platforms/platforms_debug.go and change default_platform, save_restore_platforms to "kvm" in file "tools/bazeldefs/platforms.bzl".
My solution is very strange. Maybe my environment have some problems.