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docs: Runner Doctor catalog update — B10 entrypoint fix, B13/B14/D10 new entries (2026-07-17–20 scan)#6445

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docs: Runner Doctor catalog update — B10 entrypoint fix, B13/B14/D10 new entries (2026-07-17–20 scan)#6445
lpcox merged 4 commits into
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Syncs the Runner Doctor failure-mode catalog across all three mirrored files (shared/self-hosted-failure-modes.md, self-hosted-runner-doctor.md, .github/agents/self-hosted-runner-doctor.md) with four lessons from the 2026-07-17–20 scan.

Changes

B10 — second root cause added (PRs #6342/#6356)
Even after the @digest-stripping fix from #6025, the repair container was invoked without --entrypoint sh, so AWF's own entrypoint.sh ran instead of the chown/chmod command. entrypoint.sh waits ~30 s for an iptables-init container that never starts in this context, producing the same observable: three ~30 s timeouts. Fix: --entrypoint sh + -c, stdout captured alongside stderr.

B13 — new: topology peers and difcProxyHost denied through Squid in network-isolation mode (PRs #6189, #6438)
buildProxyEnvironment() omitted config.topologyAttach peer hostnames and config.difcProxyHost from NO_PROXY. Proxy-aware clients routed those hosts through Squid, which denied them (not in the allowlist). Fixed in two PRs: #6189 (topology peers), #6438 (DIFC proxy host).

B14 — new: Copilot CLI silent crash after ~/.copilot/config.json masked as credential (PR #6374)
The mount-policy refactor (#6339) incorrectly classified config.json (experiment flags, timestamps — no token) as a credential and overlaid it with a read-only /dev/null bind mount. The Copilot CLI atomically rewrites this file at startup via temp-file + rename; the read-only overlay makes the rename fail, producing an exit-1 crash with zero output. Does not affect sbx (which moves files aside rather than overlay-masking). Fixed in #6374.

D10 — new: rootless Copilot CLI not found in sbx PATH (PR #6407)
buildCoreEnvironment() injected a PATH without ~/.local/bin. sbx microVMs don't run entrypoint.sh (which adds it for compose runtimes), so binaries installed via --rootless were present but unreachable by name. Fixed by prepending ${HOME}/.local/bin in buildCoreEnvironment().

Error-string lookup additions

Three new rows added to the quick-lookup table in all three files:

Observable Mode
Copilot CLI exits 1, ~0.5 s, zero output after AWF upgrade; sbx unaffected B14
copilot: command not found in sbx microVM, binary at ~/.local/bin/copilot D10
TCP_DENIED in Squid log for topology peer or DIFC proxy host; MCP calls fail in network-isolation B13

Copilot AI changed the title [WIP] Update Runner Doctor catalog for 2026 scan window docs: Runner Doctor catalog update — B10 entrypoint fix, B13/B14/D10 new entries (2026-07-17–20 scan) Jul 20, 2026
Copilot finished work on behalf of lpcox July 20, 2026 20:17
Copilot AI requested a review from lpcox July 20, 2026 20:17
@lpcox
lpcox marked this pull request as ready for review July 20, 2026 21:29
Copilot AI review requested due to automatic review settings July 20, 2026 21:29

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Pull request overview

Updates the mirrored Runner Doctor catalog with four recent AWF failure-mode lessons.

Changes:

  • Expands B10 with the repair-container entrypoint failure.
  • Adds B13, B14, and D10 diagnostics.
  • Adds corresponding quick-lookup entries.
Show a summary per file
File Description
.github/workflows/shared/self-hosted-failure-modes.md Updates the canonical failure catalog.
.github/workflows/self-hosted-runner-doctor.md Updates the workflow doctor guidance.
.github/agents/self-hosted-runner-doctor.md Updates the portable mirrored doctor.

Review details

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  • Files reviewed: 3/3 changed files
  • Comments generated: 9
  • Review effort level: Medium

Comment on lines +109 to +111
- Copilot CLI exits immediately (exit code 1, ~0.5 s, zero stdout/stderr) after AWF upgrade on Docker or gVisor but not sbx → B14 (`~/.copilot/config.json` incorrectly added to credential deny list; fixed in github/gh-aw-firewall#6374)
- `copilot: command not found` inside `--container-runtime sbx` when binary is at `~/.local/bin/copilot` → D10 (`~/.local/bin` not included in sbx injected PATH; fixed in github/gh-aw-firewall#6407)
- `TCP_DENIED` in Squid access log for a topology peer or `difcProxyHost` during agent run; in-session MCP/HTTP calls to those hosts fail in network-isolation mode → B13 (topology peer hostnames and `difcProxyHost` not added to `NO_PROXY`; fixed in github/gh-aw-firewall#6189 and github/gh-aw-firewall#6438)
| D7 | Claude Code (Bun runtime) crashes with `SIGSEGV` / `SIGABRT` under `--container-runtime gvisor`; the harness retries multiple times, each attempt failing with exit code 1; no output or minimal output is produced | gVisor restricts the W^X (write XOR execute) memory operations required by JIT compilers. Bun uses JavaScriptCore (JSC) with JIT enabled by default; JSC generates native code via JIT, triggering SIGSEGV/SIGABRT on gVisor's restricted syscall surface | **AWF (PR github/gh-aw-firewall#6276) automatically sets `BUN_JSC_useJIT=0`** at runtime via `buildToolEnvironment()` when Claude runs under gVisor — no workflow change required. For older AWF builds without github/gh-aw-firewall#6276, pass `--env BUN_JSC_useJIT=0` (or set it as a job-level env var with `--env-all`) as a manual fallback. | Inside the AWF gVisor agent container: `echo $BUN_JSC_useJIT` should be `0`; a crash without this flag confirms the mode via `SIGSEGV`/`SIGABRT` signal in agent logs | github/gh-aw-firewall#6260, github/gh-aw-firewall#6261, github/gh-aw-firewall#6276 |
| D8 | MCP tool calls (`safeoutputs`, `github`) return `403 ERR_ACCESS_DENIED` under `--container-runtime gvisor` or raw `runsc`; agent completes but never writes safe outputs; smoke tests fail at "Validate safe outputs were invoked"; direct `/dev/tcp` connections fail with `No route to host` | gVisor's userspace netstack is isolated from the host network namespace. The iptables DNAT `RETURN` bypass rule (installed by `awf-iptables-init`) that normally lets the agent reach the MCP gateway (`172.30.0.1:8080`) directly never fires under gVisor. MCP requests follow `HTTP_PROXY` into Squid and receive `403 ERR_ACCESS_DENIED` because the MCP gateway IP is not in the domain allowlist. | **Fixed in AWF (PR github/gh-aw-firewall#6401)**: `runtimeUsesIptables()` returns `false` for `gvisor` and its raw `runsc` alias (plus `sbx`); `awf-iptables-init` is skipped for these runtimes (`AWF_SKIP_IPTABLES_INIT=1`); the MCP gateway (`172.30.0.1`) and `host.docker.internal` are added to `NO_PROXY` so proxy-aware MCP clients connect directly. **Caveat:** proxy-unaware tools using raw sockets (e.g. `/dev/tcp`) still get `No route to host` under gVisor — egress requires proxy-aware clients. | Inspect Squid access log for `403` on `172.30.0.1`; check `NO_PROXY` env inside the agent container — should include `172.30.0.1` when runtime is `gvisor` or raw `runsc` on patched AWF | github/gh-aw-firewall#6401, github/gh-aw-firewall#6326 |
| D9 | On `--container-runtime sbx`, credential files (`~/.aws/credentials`, `~/.ssh/id_rsa`, `~/.docker/config.json`, `~/.kube/config`, `~/.azure/`, `~/.gnupg/`, `~/.netrc`, `~/.config/gh/hosts.yml`, `~/.config/gcloud/`, `~/.cargo/credentials.toml`, `~/.claude/.credentials.json`, `~/.copilot/config.json`, `~/.gemini/oauth_creds.json`) are visible to the agent inside the sbx microVM | AWF before PR github/gh-aw-firewall#6336 mounted the entire host `$HOME` (read-write) into the sbx microVM. Unlike compose mode (empty home volume + `/dev/null` overlays), sbx uses virtiofs passthrough where mounts are directory-granular and file-level overlays are not expressible. | **Fixed in AWF (PR github/gh-aw-firewall#6336)**: `sbx-manager.ts` mounts only whitelisted tool/cache + agent-state subdirs (`HOME_TOOL_SUBDIRS` + `.copilot`/`.gemini`). For whitelisted dirs that contain nested credential files (e.g. `~/.config/gh/hosts.yml`, `~/.cargo/credentials.toml`, `~/.copilot/config.json`), `scrubHomeCredentials()` moves them aside to `.awf-sbx-cred-backup-<pid>` before `sbx create` and `restoreHomeCredentials()` restores them after teardown. Workaround (older AWF): do not use `--container-runtime sbx` with real credentials in `$HOME`. | `ls $HOME/.aws $HOME/.ssh $HOME/.docker 2>/dev/null` inside the sbx sandbox — if dirs are visible, fix is not applied; confirm AWF version includes github/gh-aw-firewall#6336 | github/gh-aw-firewall#6336 |
| D10 | On `--container-runtime sbx`, Copilot CLI installed via `install_copilot_cli.sh --rootless` (redirects install to `~/.local/bin`) is **not found** even though `~/.local` is mounted into the microVM; `copilot: command not found` or `ENOENT` at agent startup | sbx microVMs do not run AWF's `entrypoint.sh` (which prepends `$HOME/.local/bin` to PATH). `buildCoreEnvironment()` injected only `/usr/local/sbin:...:/bin` as `PATH`. The binary is present in the VM but unreachable by name. Docker/gVisor compose runtimes were unaffected because `entrypoint.sh` fixed PATH for them. | **Fixed in AWF (PR github/gh-aw-firewall#6407, merged 2026-07-19):** `buildCoreEnvironment()` now prepends `${HOME}/.local/bin` to the injected PATH, fixing sbx without affecting compose runtimes. Upgrade to the AWF version including github/gh-aw-firewall#6407. Workaround (older AWF): use the non-rootless install (requires sudo on the runner) or pass `--env PATH=/home/runner/.local/bin:$PATH` explicitly. | Inside the sbx agent: `echo $PATH` — `~/.local/bin` should appear first; `which copilot` or `ls ~/.local/bin/copilot` confirms binary presence vs PATH visibility | github/gh-aw-firewall#6407 |

D9 / github/gh-aw-firewall#6336 — sbx microVMs previously mounted the entire host `$HOME`, exposing credentials such as `~/.aws/credentials`, `~/.ssh/id_rsa`, and `~/.docker/config.json`. **Fixed in AWF (PR github/gh-aw-firewall#6336)**: sbx now mounts only whitelisted home subdirectories, and `scrubHomeCredentials()` / `restoreHomeCredentials()` temporarily move nested credential files out of the mounted tree during sandbox lifetime.

D10 / github/gh-aw-firewall#6407 — On `--container-runtime sbx`, the Copilot CLI installed rootless to `~/.local/bin` was not found because `buildCoreEnvironment()` did not include `~/.local/bin` in the injected PATH and sbx microVMs do not run AWF's `entrypoint.sh` to fix PATH. **Fixed in AWF (PR github/gh-aw-firewall#6407, merged 2026-07-19):** `buildCoreEnvironment()` now prepends `${HOME}/.local/bin` to PATH for all runtimes. Workaround (older AWF): use the non-rootless install or pass `--env PATH=/home/runner/.local/bin:$PATH`.

D9 / github/gh-aw-firewall#6336 — sbx microVMs previously mounted the entire host `$HOME`, exposing credentials such as `~/.aws/credentials`, `~/.ssh/id_rsa`, and `~/.docker/config.json`. **Fixed in AWF (PR github/gh-aw-firewall#6336)**: sbx now mounts only whitelisted home subdirectories, and `scrubHomeCredentials()` / `restoreHomeCredentials()` temporarily move nested credential files out of the mounted tree during sandbox lifetime.

D10 / github/gh-aw-firewall#6407 — On `--container-runtime sbx`, the Copilot CLI installed rootless to `~/.local/bin` was not found because `buildCoreEnvironment()` did not include `~/.local/bin` in the injected PATH and sbx microVMs do not run AWF's `entrypoint.sh` to fix PATH. **Fixed in AWF (PR github/gh-aw-firewall#6407, merged 2026-07-19):** `buildCoreEnvironment()` now prepends `${HOME}/.local/bin` to PATH for all runtimes. Workaround (older AWF): use the non-rootless install or pass `--env PATH=/home/runner/.local/bin:$PATH`.
| D7 | Claude Code (Bun runtime) crashes with `SIGSEGV` / `SIGABRT` under `--container-runtime gvisor`; the harness retries multiple times, each attempt failing with exit code 1; no output or minimal output is produced | gVisor restricts the W^X (write XOR execute) memory operations required by JIT compilers. Bun uses JavaScriptCore (JSC) with JIT enabled by default; JSC generates native code via JIT, triggering SIGSEGV/SIGABRT on gVisor's restricted syscall surface | **AWF (PR github/gh-aw-firewall#6276) automatically sets `BUN_JSC_useJIT=0`** at runtime via `buildToolEnvironment()` when Claude runs under gVisor — no workflow change required. For older AWF builds without github/gh-aw-firewall#6276, pass `--env BUN_JSC_useJIT=0` (or set it as a job-level env var with `--env-all`) as a manual fallback. | Inside the AWF gVisor agent container: `echo $BUN_JSC_useJIT` should be `0`; a crash without this flag confirms the mode via `SIGSEGV`/`SIGABRT` signal in agent logs | github/gh-aw-firewall#6260, github/gh-aw-firewall#6261, github/gh-aw-firewall#6276 |
| D8 | MCP tool calls (`safeoutputs`, `github`) return `403 ERR_ACCESS_DENIED` under `--container-runtime gvisor` or raw `runsc`; agent completes but never writes safe outputs; smoke tests fail at "Validate safe outputs were invoked"; direct `/dev/tcp` connections fail with `No route to host` | gVisor's userspace netstack is isolated from the host network namespace. The iptables DNAT `RETURN` bypass rule (installed by `awf-iptables-init`) that normally lets the agent reach the MCP gateway (`172.30.0.1:8080`) directly never fires under gVisor. MCP requests follow `HTTP_PROXY` into Squid and receive `403 ERR_ACCESS_DENIED` because the MCP gateway IP is not in the domain allowlist. | **Fixed in AWF (PR github/gh-aw-firewall#6401)**: `runtimeUsesIptables()` returns `false` for `gvisor` and its raw `runsc` alias (plus `sbx`); `awf-iptables-init` is skipped for these runtimes (`AWF_SKIP_IPTABLES_INIT=1`); the MCP gateway (`172.30.0.1`) and `host.docker.internal` are added to `NO_PROXY` so proxy-aware MCP clients connect directly. **Caveat:** proxy-unaware tools using raw sockets (e.g. `/dev/tcp`) still get `No route to host` under gVisor — egress requires proxy-aware clients. | Inspect Squid access log for `403` on `172.30.0.1`; check `NO_PROXY` env inside the agent container — should include `172.30.0.1` when runtime is `gvisor` or raw `runsc` on patched AWF | github/gh-aw-firewall#6401, github/gh-aw-firewall#6326 |
| D9 | On `--container-runtime sbx`, credential files (`~/.aws/credentials`, `~/.ssh/id_rsa`, `~/.docker/config.json`, `~/.kube/config`, `~/.azure/`, `~/.gnupg/`, `~/.netrc`, `~/.config/gh/hosts.yml`, `~/.config/gcloud/`, `~/.cargo/credentials.toml`, `~/.claude/.credentials.json`, `~/.copilot/config.json`, `~/.gemini/oauth_creds.json`) are visible to the agent inside the sbx microVM | AWF before PR github/gh-aw-firewall#6336 mounted the entire host `$HOME` (read-write) into the sbx microVM. Unlike compose mode (empty home volume + `/dev/null` overlays), sbx uses virtiofs passthrough where mounts are directory-granular and file-level overlays are not expressible. | **Fixed in AWF (PR github/gh-aw-firewall#6336)**: `sbx-manager.ts` mounts only whitelisted tool/cache + agent-state subdirs (`HOME_TOOL_SUBDIRS` + `.copilot`/`.gemini`). For whitelisted dirs that contain nested credential files (e.g. `~/.config/gh/hosts.yml`, `~/.cargo/credentials.toml`, `~/.copilot/config.json`), `scrubHomeCredentials()` moves them aside to `.awf-sbx-cred-backup-<pid>` before `sbx create` and `restoreHomeCredentials()` restores them after teardown. Workaround (older AWF): do not use `--container-runtime sbx` with real credentials in `$HOME`. | `ls $HOME/.aws $HOME/.ssh $HOME/.docker 2>/dev/null` inside the sbx sandbox — if dirs are visible, fix is not applied; confirm AWF version includes github/gh-aw-firewall#6336 | github/gh-aw-firewall#6336 |
| D10 | On `--container-runtime sbx`, Copilot CLI installed via `install_copilot_cli.sh --rootless` (redirects install to `~/.local/bin`) is **not found** even though `~/.local` is mounted into the microVM; `copilot: command not found` or `ENOENT` at agent startup | sbx microVMs do not run AWF's `entrypoint.sh` (which prepends `$HOME/.local/bin` to PATH). `buildCoreEnvironment()` injected only `/usr/local/sbin:...:/bin` as `PATH`. The binary is present in the VM but unreachable by name. Docker/gVisor compose runtimes were unaffected because `entrypoint.sh` fixed PATH for them. | **Fixed in AWF (PR github/gh-aw-firewall#6407, merged 2026-07-19):** `buildCoreEnvironment()` now prepends `${HOME}/.local/bin` to the injected PATH, fixing sbx without affecting compose runtimes. Upgrade to the AWF version including github/gh-aw-firewall#6407. Workaround (older AWF): use the non-rootless install (requires sudo on the runner) or pass `--env PATH=/home/runner/.local/bin:$PATH` explicitly. | Inside the sbx agent: `echo $PATH` — `~/.local/bin` should appear first; `which copilot` or `ls ~/.local/bin/copilot` confirms binary presence vs PATH visibility | github/gh-aw-firewall#6407 |
| B11 | AWF exits with code 1 and logs show `[WARN] Rootless artifact permission repair failed ... (exit 1)` plus cleanup warnings, but no actionable stderr detail from the repair container | `fixArtifactPermissionsForRootless()` previously discarded repair-container stderr, so the warning hid the real failure context. The non-zero exit code comes from `runAgentCommand()` before cleanup; cleanup warnings do not override it. | **Improved in AWF (PR github/gh-aw-firewall#6072, merged 2026-07-10)**: stderr from the repair container is now captured in the warning, and chroot-home cleanup noise is reduced by downgrading that log from `warn` to `debug`. Treat this mode as diagnostic-opacity around a pre-existing non-zero command exit, not cleanup-driven exit-code mutation. | Compare agent-command logs with `Command completed with exit code: <n>`; on affected versions, repair warnings lack stderr context. On AWF including github/gh-aw-firewall#6072, the warning includes stderr detail for root-cause triage. | github/gh-aw-firewall#6070, github/gh-aw-firewall#6072 |
| B12 | `getaddrinfo EAI_AGAIN <awmg-cli-proxy>` or `ENOTFOUND <awmg-cli-proxy>` → `awf-cli-proxy could not connect to the external DIFC proxy` → `The agent was never invoked` on ARC/DinD, and DinD containers cannot resolve the Kubernetes Service name even after the ordering fix | ARC/DinD DNS isolation: the DinD Docker network does not forward DNS to the cluster resolver, so Kubernetes Service names such as `awmg-cli-proxy` are unreachable from AWF containers even though the service exists. | **Diagnosed in AWF (PR github/gh-aw-firewall#6328, merged 2026-07-17):** `detectDnsResolutionFailure()` scans cli-proxy logs for `EAI_AGAIN`/`ENOTFOUND`, extracts the unresolved hostname, and augments the startup error with concrete remediation. Address the DIFC proxy by IP, or configure `dockerd --dns <cluster-dns-ip>` so DinD containers can reach the cluster DNS server. | `docker run --rm alpine nslookup awmg-cli-proxy` — `NXDOMAIN`/`SERVFAIL` confirms the Kubernetes DNS is not reachable from DinD containers; compare with the augmented startup error from `detectDnsResolutionFailure()` | github/gh-aw-firewall#6326, github/gh-aw-firewall#6328 |
| B13 | In `--network-isolation` mode, MCP tool calls to topology-attached peers (e.g. `awmg-mcpg`) or to a `difcProxyHost` configured independently of `topologyAttach` return connection errors or are logged as `TCP_DENIED` in Squid's access log; the agent can reach the DIFC proxy host during startup (B5/B12) but individual in-session MCP/HTTP calls to those same hosts fail or produce Squid 403 noise | `buildProxyEnvironment()` assembled `NO_PROXY` from a static list of AWF-internal hosts but did not include (a) `config.topologyAttach` peer hostnames or (b) `config.difcProxyHost`. Proxy-aware clients (Node `undici`, curl) honoured `HTTPS_PROXY` for those hosts; Squid denied them because they are not in the domain allowlist. | **Fixed in AWF (PR github/gh-aw-firewall#6189, merged 2026-07-20):** `config.topologyAttach` peer hostnames are now added to `NO_PROXY`/`no_proxy`. **Fixed in AWF (PR github/gh-aw-firewall#6438, merged 2026-07-20):** `config.difcProxyHost` (stripped of any `:port` suffix) is also added to `NO_PROXY`. Upgrade AWF to version including both PRs. | Inspect Squid `access.log` for `TCP_DENIED` entries whose target host is a topology peer or the DIFC proxy host; inside the agent container check `echo $NO_PROXY` — the topology peer and DIFC proxy hostname should appear | github/gh-aw-firewall#6189, github/gh-aw-firewall#6438 |
| B14 | After upgrading to AWF including the centralized mount-policy refactor (PR github/gh-aw-firewall#6339), the Copilot CLI agent exits immediately (exit code 1, ~0.5 s, zero stdout/stderr); no network calls are made; the issue appears on Docker and gVisor runtimes but not sbx (which moves files aside rather than overlay-masking them) | PR github/gh-aw-firewall#6339 added `~/.copilot/config.json` to the credential **deny list** with reason *"Copilot CLI persisted auth token"*. This is incorrect: `config.json` contains only experiment flags, first-launch timestamps, and plugin metadata — no token. AWF masks denied files with a **read-only** `/dev/null` bind-mount overlay. The Copilot CLI reads **and atomically rewrites** `config.json` via temp-file + rename at startup; a rename cannot target a bind-mounted path and the overlay is read-only, so the CLI crashes silently. | **Fixed in AWF (PR github/gh-aw-firewall#6374, merged 2026-07-18):** `~/.copilot/config.json` is removed from the credential deny list; the file is bind-mounted read-write as part of the `.copilot` tool subdir (pre-#6339 behaviour). Upgrade to the AWF version including github/gh-aw-firewall#6374. Workaround (older AWF): pass `--keep-containers` and inspect the agent container for `EROFS` or rename errors; downgrade AWF past github/gh-aw-firewall#6339 if unpatched. | `awf ... copilot agent --version` — if it exits 1 with no output in ~0.5 s, confirm AWF version includes github/gh-aw-firewall#6374; inspect agent container logs for `EROFS`/`rename` errors on `~/.copilot/config.json` | github/gh-aw-firewall#6339, github/gh-aw-firewall#6374 |
| B11 | AWF exits with code 1 and logs show `[WARN] Rootless artifact permission repair failed ... (exit 1)` plus cleanup warnings, but no actionable stderr detail from the repair container | `fixArtifactPermissionsForRootless()` previously discarded repair-container stderr, so the warning hid the real failure context. The non-zero exit code comes from `runAgentCommand()` before cleanup; cleanup warnings do not override it. | **Improved in AWF (PR github/gh-aw-firewall#6072, merged 2026-07-10)**: stderr from the repair container is now captured in the warning, and chroot-home cleanup noise is reduced by downgrading that log from `warn` to `debug`. Treat this mode as diagnostic-opacity around a pre-existing non-zero command exit, not cleanup-driven exit-code mutation. | Compare agent-command logs with `Command completed with exit code: <n>`; on affected versions, repair warnings lack stderr context. On AWF including github/gh-aw-firewall#6072, the warning includes stderr detail for root-cause triage. | github/gh-aw-firewall#6070, github/gh-aw-firewall#6072 |
| B12 | `getaddrinfo EAI_AGAIN <awmg-cli-proxy>` or `ENOTFOUND <awmg-cli-proxy>` → `awf-cli-proxy could not connect to the external DIFC proxy` → `The agent was never invoked` on ARC/DinD, and DinD containers cannot resolve the Kubernetes Service name even after the ordering fix | ARC/DinD DNS isolation: the DinD Docker network does not forward DNS to the cluster resolver, so Kubernetes Service names such as `awmg-cli-proxy` are unreachable from AWF containers even though the service exists. | **Diagnosed in AWF (PR github/gh-aw-firewall#6328, merged 2026-07-17):** `detectDnsResolutionFailure()` scans cli-proxy logs for `EAI_AGAIN`/`ENOTFOUND`, extracts the unresolved hostname, and augments the startup error with concrete remediation. Address the DIFC proxy by IP, or configure `dockerd --dns <cluster-dns-ip>` so DinD containers can reach the cluster DNS server. | `docker run --rm alpine nslookup awmg-cli-proxy` — `NXDOMAIN`/`SERVFAIL` confirms the Kubernetes DNS is not reachable from DinD containers; compare with the augmented startup error from `detectDnsResolutionFailure()` | github/gh-aw-firewall#6326, github/gh-aw-firewall#6328 |
| B13 | In `--network-isolation` mode, MCP tool calls to topology-attached peers (e.g. `awmg-mcpg`) or to a `difcProxyHost` configured independently of `topologyAttach` return connection errors or are logged as `TCP_DENIED` in Squid's access log; the agent can reach the DIFC proxy host during startup (B5/B12) but individual in-session MCP/HTTP calls to those same hosts fail or produce Squid 403 noise | `buildProxyEnvironment()` assembled `NO_PROXY` from a static list of AWF-internal hosts but did not include (a) `config.topologyAttach` peer hostnames or (b) `config.difcProxyHost`. Proxy-aware clients (Node `undici`, curl) honoured `HTTPS_PROXY` for those hosts; Squid denied them because they are not in the domain allowlist. | **Fixed in AWF (PR github/gh-aw-firewall#6189, merged 2026-07-20):** `config.topologyAttach` peer hostnames are now added to `NO_PROXY`/`no_proxy`. **Fixed in AWF (PR github/gh-aw-firewall#6438, merged 2026-07-20):** `config.difcProxyHost` (stripped of any `:port` suffix) is also added to `NO_PROXY`. Upgrade AWF to version including both PRs. | Inspect Squid `access.log` for `TCP_DENIED` entries whose target host is a topology peer or the DIFC proxy host; inside the agent container check `echo $NO_PROXY` — the topology peer and DIFC proxy hostname should appear | github/gh-aw-firewall#6189, github/gh-aw-firewall#6438 |
| B14 | After upgrading to AWF including the centralized mount-policy refactor (PR github/gh-aw-firewall#6339), the Copilot CLI agent exits immediately (exit code 1, ~0.5 s, zero stdout/stderr); no network calls are made; the issue appears on Docker and gVisor runtimes but not sbx (which moves files aside rather than overlay-masking them) | PR github/gh-aw-firewall#6339 added `~/.copilot/config.json` to the credential **deny list** with reason *"Copilot CLI persisted auth token"*. This is incorrect: `config.json` contains only experiment flags, first-launch timestamps, and plugin metadata — no token. AWF masks denied files with a **read-only** `/dev/null` bind-mount overlay. The Copilot CLI reads **and atomically rewrites** `config.json` via temp-file + rename at startup; a rename cannot target a bind-mounted path and the overlay is read-only, so the CLI crashes silently. | **Fixed in AWF (PR github/gh-aw-firewall#6374, merged 2026-07-18):** `~/.copilot/config.json` is removed from the credential deny list; the file is bind-mounted read-write as part of the `.copilot` tool subdir (pre-#6339 behaviour). Upgrade to the AWF version including github/gh-aw-firewall#6374. Workaround (older AWF): pass `--keep-containers` and inspect the agent container for `EROFS` or rename errors; downgrade AWF past github/gh-aw-firewall#6339 if unpatched. | `awf ... copilot agent --version` — if it exits 1 with no output in ~0.5 s, confirm AWF version includes github/gh-aw-firewall#6374; inspect agent container logs for `EROFS`/`rename` errors on `~/.copilot/config.json` | github/gh-aw-firewall#6339, github/gh-aw-firewall#6374 |
- `FATAL: http_port: IPv6 is not available` → B3
- `No CA certificates were loaded from the system` in chroot on RHEL/Fedora/Amazon Linux → B9 (missing /etc/pki/ mount)
- `[WARN] Rootless artifact permission repair failed` with each attempt taking ~30 s (registry timeout, not instant) → B10 (compound tag@digest ref causes Docker to attempt GHCR manifest verification even under `--pull never`)
- `[WARN] Rootless artifact permission repair failed` with each attempt taking ~30 s (registry timeout, not instant) → B10 (compound tag@digest ref causes Docker to attempt GHCR manifest verification even under `--pull never`; or, even with a tag-only ref, `docker run` missing `--entrypoint sh` causes AWF's own `entrypoint.sh` to run and wait ~30 s for iptables-init — fixed in github/gh-aw-firewall#6342/github/gh-aw-firewall#6356)
- `FATAL: http_port: IPv6 is not available` → B3
- `No CA certificates were loaded from the system` in chroot on RHEL/Fedora/Amazon Linux → B9 (missing /etc/pki/ mount)
- `[WARN] Rootless artifact permission repair failed` with each attempt taking ~30 s (registry timeout, not instant) → B10 (compound tag@digest ref causes Docker to attempt GHCR manifest verification even under `--pull never`)
- `[WARN] Rootless artifact permission repair failed` with each attempt taking ~30 s (registry timeout, not instant) → B10 (compound tag@digest ref causes Docker to attempt GHCR manifest verification even under `--pull never`; or, even with a tag-only ref, `docker run` missing `--entrypoint sh` causes AWF's own `entrypoint.sh` to run and wait ~30 s for iptables-init — fixed in github/gh-aw-firewall#6342/github/gh-aw-firewall#6356)
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lpcox commented Jul 20, 2026

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@copilot address review feedback

Copilot AI commented Jul 20, 2026

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@copilot address review feedback

Addressed in 901d379.

Updated the three mirrored Runner Doctor sources to fix D10 wording/workaround (sbx command wrapper after bash -lc init), removed ~/.copilot/config.json from D9 credential signals/examples, and made B10 timing text non-registry-specific. Regenerated .github/workflows/self-hosted-runner-doctor.lock.yml and updated the corresponding workflow test expectations.

Copilot finished work on behalf of lpcox July 20, 2026 22:10
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@copilot resolve the merge conflicts in this pull request

@lpcox lpcox closed this Jul 20, 2026
@lpcox lpcox reopened this Jul 20, 2026
…-doctor-catalog

# Conflicts:
#	.github/workflows/self-hosted-runner-doctor.lock.yml
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✅ Copilot review passed with no inline comments.

@copilot Add the ready-for-aw label to this PR to trigger agentic CI smoke tests.

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✅ Coverage Check Passed

Overall Coverage

Metric Base PR Delta
Lines 98.76% 98.79% 📈 +0.03%
Statements 98.70% 98.73% 📈 +0.03%
Functions 99.28% 99.28% ➡️ +0.00%
Branches 95.01% 95.01% ➡️ +0.00%
📁 Per-file Coverage Changes (1 files)
File Lines (Before → After) Statements (Before → After)
src/log-directory-setup.ts 96.2% → 100.0% (+3.78%) 96.3% → 100.0% (+3.71%)

Coverage comparison generated by scripts/ci/compare-coverage.ts

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🔌 Smoke Services — All services reachable! ✅

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Smoke Claude passed

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Smoke Copilot BYOK completed. Copilot BYOK mode operational. 🔓

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Contribution Check completed successfully!

PR #6445 follows the applicable CONTRIBUTING.md guidelines: the change is documentation-only, includes a clear description and issue reference, and updates the mirrored docs consistently. No missing tests or file-organization issues to flag.

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Smoke Gemini completed. All facets verified. 💎

Smoke tests complete. Overall status: FAIL. Connectivity to github.com failed. File writing and bash tool tests passed. PRs identified: #6446, #6438.

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Chroot tests passed! Smoke Chroot - All security and functionality tests succeeded.

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Smoke Copilot BYOK AOAI (api-key) completed. Copilot AOAI BYOK (api-key) mode operational. 🔓

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🔍 Smoke Test Results

Test Status
GitHub MCP connectivity ✅ MCP reachable (secrecy policy filtered PR data — expected for private repo)
GitHub.com HTTP connectivity ⚠️ Pre-step template vars not expanded
File write/read ⚠️ Pre-step template vars not expanded

Overall: PARTIAL — MCP engine is operational; pre-step smoke data was not injected (template variables unexpanded, likely a workflow configuration issue).

@lpcox — smoke test ran but steps.smoke-data.outputs were not available to the agent.

📰 BREAKING: Report filed by Smoke Copilot
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Smoke Test: Claude Engine Validation

Check Result
API status ✅ PASS
gh check ✅ PASS
File status ✅ PASS

Overall result: PASS

Generated by Smoke Claude for #6445 · 54.4 AIC · ⊞ 3.3K ·
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@lpcox — Smoke test: Copilot Network Isolation Egress Enforcement

EGRESS_RESULT allow=pass deny=pass

✅ Allowed domain (api.github.com) — HTTP 200
✅ Blocked domain (example.com) — 403 proxy denial

Overall: PASS

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

  • example.com

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "example.com"

See Network Configuration for more information.

🛡️ Egress verdict from Smoke Copilot Network Isolation
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@github-actions github-actions Bot added the smoke-copilot-network-isolation Copilot network-isolation egress smoke test label Jul 20, 2026
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Smoke Test Results — FAIL

Check Result
Redis PING ❌ Name resolution failed for host.docker.internal
PostgreSQL pg_isready ❌ No response
PostgreSQL SELECT 1 ❌ Name resolution failed

Overall: FAILhost.docker.internal is not resolvable in this environment. Service containers may not be running or DNS is not configured to reach them.

🔌 Service connectivity validated by Smoke Services
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@lpcox

  • MCP PR data: ✅
  • GitHub.com HTTP: ✅
  • File read/write: ✅
  • BYOK inference: ✅
    Running in direct BYOK mode (AWF_AUTH_TYPE=github-oidc + AWF_AUTH_AZURE_* + COPILOT_PROVIDER_BASE_URL) via api-proxy → Azure OpenAI (Foundry, o4-mini-aw) authenticated via Microsoft Entra

Overall PASS

🪪 BYOK (AOAI Entra) report filed by Smoke Copilot BYOK AOAI (Entra)
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🔥 AWF Smoke Test — PAT Auth

Test Result
GitHub MCP connectivity ✅ Connected
github.com HTTP ✅ 200 OK
File write/read ❌ File not found (template vars unresolved)

Overall: FAIL

Auth mode: PAT (COPILOT_GITHUB_TOKEN)

Note: steps.smoke-data.outputs template variables were not substituted — pre-step likely did not run or outputs were not set.

🔑 PAT report filed by Smoke Copilot PAT
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Smoke test results: FAIL

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

  • localhost

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "localhost"

See Network Configuration for more information.

💎 Faceted by Smoke Gemini
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Smoke test results:

  • chore: upgrade gh-aw extension to v0.82.14 pre-release
  • fix: exempt DIFC/cli-proxy host from proxy routing in isolation mode
  • GitHub page title contains GitHub ✅
  • Smoke file write/read ✅
  • npm ci && npm run build
    Overall: PASS

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

  • registry.npmjs.org

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "registry.npmjs.org"

See Network Configuration for more information.

🔮 The oracle has spoken through Smoke Codex
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Smoke Test: Copilot BYOK (Direct) Mode

✅ GitHub MCP connectivity verified
✅ BYOK inference path working (agent → api-proxy → api.githubcopilot.com)
✅ Agent environment configured with dummy COPILOT_API_KEY placeholder
⚠️ Pre-fetched test data (HTTP code, file tests) not provided in environment

Status: Infrastructure tests PASS
Mode: Direct BYOK (COPILOT_PROVIDER_API_KEY)

🔑 BYOK report filed by Smoke Copilot BYOK
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Smoke Test: API Proxy OpenTelemetry Tracing

Scenario Result Notes
S1: Module Loading otel.js loads successfully; exports: startRequestSpan, setTokenAttributes, setBudgetAttributes, endSpan, endSpanError, shutdown, isEnabled + internal symbols
S2: Test Suite 59 passed, 0 failed across otel.test.js + otel-fanout.test.js (GenAI attrs, OTLP exporter, file exporter, serialization, span lifecycle)
S3: Env Var Forwarding src/services/api-proxy-env-config.ts forwards OTEL_EXPORTER_OTLP_ENDPOINT, OTEL_EXPORTER_OTLP_HEADERS, GITHUB_AW_OTEL_TRACE_ID, GITHUB_AW_OTEL_PARENT_SPAN_ID, OTEL_SERVICE_NAME (defaults to awf-api-proxy)
S4: Token Tracker Integration onUsage callback exists in token-tracker-http.js (line 343); invoked after normalized usage extraction — confirmed OTEL hook point
S5: OTEL Diagnostics No runtime spans exported (no OTEL endpoint configured in sandbox); graceful degradation confirmed — no errors when unconfigured

Summary: All 5 scenarios pass. OTEL tracing integration is fully functional in containers/api-proxy/.

📡 OTel tracing validated by Smoke OTel Tracing
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Chroot Runtime Version Check ✅

Runtime Host Version Chroot Version Match?
Python Python 3.12.13 Python 3.12.13
Node.js v24.18.0 v24.18.0
Go go1.22.12 go1.22.12

All runtimes match between host and chroot environments.

Tested by Smoke Chroot
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🏗️ Build Test Suite Results

Ecosystem Project Build/Install Tests Status
Bun elysia 1/1 passed ✅ PASS
Bun hono 1/1 passed ✅ PASS
C++ fmt N/A ✅ PASS
C++ json N/A ✅ PASS
Deno oak N/A 1/1 passed ✅ PASS
Deno std N/A 1/1 passed ✅ PASS
.NET hello-world N/A ✅ PASS
.NET json-parse N/A ✅ PASS
Go color 1/1 passed ✅ PASS
Go env 1/1 passed ✅ PASS
Go uuid 1/1 passed ✅ PASS
Java gson 1/1 passed ✅ PASS
Java caffeine 1/1 passed ✅ PASS
Node.js clsx All passed ✅ PASS
Node.js execa All passed ✅ PASS
Node.js p-limit All passed ✅ PASS
Rust fd 1/1 passed ✅ PASS
Rust zoxide 1/1 passed ✅ PASS

Overall: 8/8 ecosystems passed — ✅ PASS

Generated by Build Test Suite for #6445 · 38.5 AIC · ⊞ 8.3K ·
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@lpcox smoke test results:

  • GitHub MCP connectivity: ✅
  • GitHub.com connectivity: ✅
  • File I/O test: ✅
  • BYOK inference test: ✅

Running in direct BYOK mode (COPILOT_PROVIDER_API_KEY + COPILOT_PROVIDER_BASE_URL) via api-proxy → Azure OpenAI (Foundry, o4-mini-aw)

Overall: PASS

🔑 BYOK (AOAI api-key) report filed by Smoke Copilot BYOK AOAI (api-key)
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🔥 Smoke Test: Docker Sbx Validation

Test Result
GitHub MCP connectivity ✅ (data filtered by secrecy policy, but connected)
GitHub.com HTTP ✅ HTTP 200
File write/read ⚠️ Template vars not substituted — smoke file not found

Overall: PASS (core connectivity verified; file test inconclusive due to unresolved template variables)

PR author: @lpcox

📰 BREAKING: Report filed by Smoke Docker Sbx
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@lpcox
lpcox merged commit e962a77 into main Jul 20, 2026
137 of 141 checks passed
@lpcox
lpcox deleted the copilot/update-runner-doctor-catalog branch July 20, 2026 22:49
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