[CI] Ventura Show Bot Info stalls until the 120-minute job timeout

[dalexsoto]

Failure signature

The M1 - Mac Ventura (13) macOS tests job stalls in the pre-test Show Bot Info task on VSM-XAM-70.Ventura.arm64 until Azure DevOps cancels the job:

The job running on agent VSM-XAM-70.Ventura.arm64 ran longer than the maximum time of 120 minutes.
The Operation will be canceled.

All five occurrences use job e59aa738-7d46-5a5e-8f43-c6b31f5d2976 and task fdc1737c-f64b-5ec2-e381-d3e861748b97, both at attempt 1. No tests start.

Confirmed occurrences

PR / head	Azure run	Terminal time (UTC)	Task
#26437 / f0243b8d39cefffaf2c857b7bf0713331c111b00	15030991 (20260820.1)	2026-08-20 04:47:56	Show Bot Info
#26437 / 3fb3386245d841672f793bead4bf8c56f3d70149	15016000 (20260819.2)	2026-08-19 04:44:42	Show Bot Info
#26444 / 67e16a518ef18a296c6c9040021675b35ead479e	15063623 (20260823.3)	2026-08-23 04:41:17	Show Bot Info
#26444 / 7e32119e9ac03e47fbdb101036d93d683ff67a57	15045113 (20260821.6)	2026-08-21 04:47:37	Show Bot Info
#26444 / e28113097531b53792a97564a04a949b74658aa6	15000705 (20260818.3)	2026-08-18 04:42:57	Show Bot Info

Total: 5 occurrences across 2 distinct monitored PRs and 5 distinct heads. First observed at 2026-08-18T04:42:57Z; latest observed at 2026-08-23T04:41:17Z.

Classification and impact

CI infrastructure failure. The same pre-test task, worker, record IDs, and hard timeout recur on unrelated dependency-update PRs. The job never reaches build or test execution, so this is not evidence of a source or deterministic test regression. It blocks the complete Ventura stage and the overall simulator check.

Investigation performed

• Inspected authenticated Azure DevOps build metadata, trigger fields, timelines, task logs, attempts, and retained run history.
• Verified each occurrence was an automatic initial PR run on a distinct head, with attempt 1 and no previous attempts.
• Correlated 5 exact-signature occurrences among 15 retained simulator runs for these PRs.
• Searched open and closed dotnet/macios issues separately by exact timeout text, task name, worker, and Ventura component terms. Existing timeout issues concern test execution or provisioning and do not match this pre-test task stall.

The lower-level reason Show Bot Info stops making progress remains unresolved. Azure task logs are retention-limited.

Workaround

Rerun failed jobs after refreshing the PR head, merge-conflict state, retry budgets, and equivalent active attempts. This may unblock the PR but does not fix the affected worker/task.

[dalexsoto]

Attempt-2 recurrence and retry update for PR #26437 @ f0243b8d39cefffaf2c857b7bf0713331c111b00:

• Build 15030991, Ventura stage attempt 2 / Show Bot Info reproduced the exact signature on VSM-XAM-70.Ventura.arm64.
• The task ran from 2026-08-24T05:45:04Z to 07:44:19Z; the job was canceled at 07:44:22Z after exceeding 120 minutes. No tests started. Build 15030991 completed failed at 07:49:24Z.
• This raises the canonical total to 6 confirmed occurrences across 2 distinct monitored PRs.
• After refreshing the unchanged MERGEABLE/BLOCKED head, active attempts, and retry ledgers, Azure accepted failed-jobs attempt 3. Retry usage is now 2 PR-lifetime / 2 current-head requests.
• Issue-specific checklist: none; the issue body has no Additional info to collect section.

[dalexsoto]

Attempt-3 recurrence and retry-loop decision for PR #26437 @ f0243b8d39cefffaf2c857b7bf0713331c111b00:

• Build 15030991, Ventura stage attempt 3 / Show Bot Info again reproduced the exact signature on VSM-XAM-70.Ventura.arm64.
• The task ran from 2026-08-24T07:55:37Z to 09:54:51Z; the job was canceled at 09:54:54Z after exceeding 120 minutes. No tests started. The build completed failed at 09:59:58Z.
• The canonical total is now 7 confirmed occurrences across 2 distinct monitored PRs.
• No further retry submitted. Retry usage remains 2 PR-lifetime / 2 current-head requests, but attempts 2 and 3 both reproduced the same fixed-worker pre-test stall. Another unchanged retry would provide no new diagnostic evidence and has not been an effective workaround.
• Issue-specific checklist: none; the issue body has no Additional info to collect section.

[dalexsoto]

New-head recurrence on PR #26437 @ 75559c264c90d3d77471700e17a4515090f82cc4:

• Build 15083235 / Ventura Show Bot Info reproduced the exact fixed-worker signature on VSM-XAM-70.Ventura.arm64.
• The task ran from 2026-08-25T02:48:58Z to 04:48:19Z; the job was canceled at 04:48:22Z after exceeding 120 minutes. No tests started. The build completed failed at 04:52:18Z.
• The canonical total is now 8 confirmed occurrences across 2 distinct monitored PRs.
• No retry submitted. PR retry usage remains 2 lifetime / 0 current-head requests. Two retries on the previous head reproduced the same stall, and this new head confirms that retrying the unchanged fixed-worker path is not an effective workaround.
• Issue-specific checklist: none; the issue body has no Additional info to collect section.

[dalexsoto]

New occurrence and retry outcome for the Ventura Show Bot Info signature:

• PR [main] Update dependencies from dotnet/dotnet #26444 @ 208d8d5caa0800da19d399c0b11b789c1986f020: build 15085070 attempt 1 stalled in Show Bot Info on VSM-XAM-70.Ventura.arm64 from 2026-08-25T05:46:41Z until 07:46:03Z. The job exceeded 120 minutes, no tests started, and the build completed failed at 07:51:04Z.
• The canonical total is now 9 confirmed occurrences across 2 distinct monitored PRs.
• PR [main] Update dependencies from dotnet/xharness #26437 @ 75559c264c90d3d77471700e17a4515090f82cc4: an externally initiated failed-job retry of build 15083235 attempt 2 reran the Ventura stage on VSM-XAM-68.Ventura.arm64 and succeeded at 07:58:25Z. Publish-results processing is still active. The triggering actor is unavailable from Azure metadata; the monitor did not submit this retry. Retry accounting is now 3 PR-lifetime / 1 current-head request.

No retry submitted for #26444: its failed-jobs set also includes a deterministic app-size assertion, and prior retries on the fixed VSM-XAM-70 path were ineffective.

Issue-specific checklist: none; the issue body has no Additional info to collect section.

[dalexsoto]

Final retry outcome for PR #26437 @ 75559c264c90d3d77471700e17a4515090f82cc4:

• Build 15083235 attempt 2 completed successfully at 2026-08-25T08:06:02Z.
• The Ventura stage passed on VSM-XAM-68.Ventura.arm64, publish-results processing completed, and PR [main] Update dependencies from dotnet/xharness #26437 merged at 08:06:44Z.
• Retry accounting remains 3 PR-lifetime / 1 current-head request. The canonical failure count remains 9 occurrences across 2 distinct monitored PRs.

Issue-specific checklist: none; the issue body has no Additional info to collect section.