/dump fails with "WriteDumpAsync failed - HRESULT: 0x00000000"

Description

When attempting to take a full dump by navigating to /dump endpoint (with defaults) the following error message is returned:

{"status":400,"detail":"WriteDumpAsync failed - HRESULT: 0x00000000"}

Only mention I see of this error is in #1216 but I’ve verified folder exists and is writable:

# on sidecar
            - name: DOTNETMONITOR_Storage__DumpTempFolder
              value: /dumps
# on both sidecar and app
            - mountPath: /dumps
              name: dumpsvol

Configuration

Pod with process running RHEL UBI8 (registry.access.redhat.com/ubi8/dotnet-60-runtime:6.0-5)

Dotnet --info
  Version: 6.0.2
  Commit:  839cdfb0ec

Sidecar (ms provided container) /info:

{"version":"6.1.1+17a566bc3228b2ea2a9bfa6d75423637c340943a","runtimeVersion":"6.0.4","diagnosticPortMode":"Connect","diagnosticPortName":null}

Configured with defaults other than “–no-auth” arg and DOTNETMONITOR_Urls and DOTNETMONITOR_Storage__DumpTempFolder env vars set.

Other information

• /trace & /gcdump work without issue.
• I’ve tried adding SYS_PTRACE capability to both and shareProcessNamespace as well since I saw those mentioned occasionally but same error occurred. I think those were for older dotnet dump versions anyway.

[hoyosjs]

This looks like https://github.com/dotnet/runtime/pull/67544

[plaisted]

I’ll close this, appears related to linked fix (or other photon os specific issue) and not specific to dotnet monitor tooling itself.