microsoft / microsoft/WSL

Support for kdump/kexec on WSL2

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#5,823 10 comments 0 reactions 0 assignees View on GitHub

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feature
Dominant language
C++
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Description

I am trying to set up kernel core dumps (preferably kdump but vmcore is OK) on WSL2 4.19.128-microsoft-standard. I'm wanting to use this for testing, and debugging (I'm working on some kernel panic / dump parsers) and was hoping I could use WSL2 to generate kdumps via sysrq or driver causing an OOPS. I can install kdump-tools and kernel-kdump but I cannot get it all configured, such as setting crashkernel kernel variabl

Describe the solution you'd like
A clear and concise description of what you want to happen.

Describe alternatives you've considered
Unclear if there are workarounds outside of not using WSL2 for kdump. For sysrq issue that can be resolved by building a driver to trigger a panic.

Additional context

kdump-config show

  • kdump is not supported by this kernel
  • no crashkernel= parameter in the kernel cmdline
    DUMP_MODE: kdump
    USE_KDUMP: 1
    KDUMP_SYSCTL: kernel.panic_on_oops=1
    KDUMP_COREDIR: /var/crash
    crashkernel addr:
    /var/lib/kdump/vmlinuz
    kdump initrd:
    /var/lib/kdump/initrd.img
    cat: /sys/kernel/kexec_crash_loaded: No such file or directory
    /usr/sbin/kdump-config: line 155: [: too many arguments
    current state: Not ready to kdump

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the reported kdump-config output for WSL2 4.19.128-microsoft-standard, including the missing crashkernel command-line parameter and /sys/kernel/kexec_crash_loaded path. Investigate the kernel and driver support involved in kdump/kexec; done means WSL2 can load a crash kernel and produce a vmcore or kdump without the reported unsupported state.

Written by the indexing model from the issue text.

Assessment

Tech stack
linux
Domain
operating-systems
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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