Bug: Intermittent Assertion failure: aStr.mDataFlags & DataFlags::TERMINATED (Unterminated literal), at /builds/worker/checkouts/gecko/xpcom/string/nsTSubstring.cpp:512
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2025-01-27 21:39:14+00:00
Resolved: 2025-02-24 12:04:44+00:00

**Filed by:** abutkovits [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=492024261&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/DR5lMhccStSaWc0TpqVXRw/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2025-01-27T21:03:04.370Z] 21:03:04     INFO - TEST-PASS | browser/components/tabbrowser/test/browser/tabs/browser_restore_isAppTab.js | Docshell should think it is an app tab - 
[task 2025-01-27T21:03:04.371Z] 21:03:04     INFO - Console message: [JavaScript Warning: "This page is in Quirks Mode. Page layout may be impacted. For Standards Mode use “<!DOCTYPE html>”." {file: "https://example.com/browser/browser/components/tabbrowser/test/browser/tabs/dummy_page.html" line: 0}]
[task 2025-01-27T21:03:04.371Z] 21:03:04     INFO - Buffered messages finished
[task 2025-01-27T21:03:04.371Z] 21:03:04     INFO - TEST-UNEXPECTED-TIMEOUT | browser/components/tabbrowser/test/browser/tabs/browser_restore_isAppTab.js | application timed out after 370 seconds with no output
[task 2025-01-27T21:03:04.371Z] 21:03:04     INFO - TEST-INFO took 398000ms
[task 2025-01-27T21:03:04.372Z] 21:03:04     INFO - Buffered messages finished
[task 2025-01-27T21:03:04.372Z] 21:03:04  WARNING - Force-terminating active process(es).
[task 2025-01-27T21:03:04.372Z] 21:03:04  WARNING - profiler Attempting to start the profiler to help with diagnosing the hang.
[task 2025-01-27T21:03:04.373Z] 21:03:04     INFO - profiler Sending SIGUSR1 to pid 756 start the profiler.
[task 2025-01-27T21:03:04.373Z] 21:03:04     INFO - profiler Waiting 10s to capture a profile...
[task 2025-01-27T21:03:14.503Z] 21:03:14     INFO - profiler Sending SIGUSR2 to pid 756 stop the profiler.
[task 2025-01-27T21:03:14.503Z] 21:03:14     INFO - profiler Wait 10s for Firefox to write the profile to disk.
[task 2025-01-27T21:03:24.583Z] 21:03:24     INFO - profiler Symbolicating profile in /opt/worker/tasks/task_173801086077195/build/blobber_upload_dir
[task 2025-01-27T21:03:24.584Z] 21:03:24     INFO - profiler Looking inside symbols dir: /opt/worker/tasks/task_173801086077195/build/symbols)
[task 2025-01-27T21:03:24.584Z] 21:03:24     INFO - profiler Symbolicating profile: /opt/worker/tasks/task_173801086077195/build/blobber_upload_dir/profile_0_756.json
[task 2025-01-27T21:03:24.584Z] 21:03:24     INFO - profiler Symbolicating the performance profile... This could take a couple of minutes.
[task 2025-01-27T21:03:24.585Z] 21:03:24    ERROR - profiler Encountered an exception during profile symbolication
[task 2025-01-27T21:03:24.585Z] 21:03:24    ERROR - profiler [Errno 2] No such file or directory: '/opt/worker/tasks/task_173801086077195/build/blobber_upload_dir/profile_0_756.json'
[task 2025-01-27T21:03:24.586Z] 21:03:24     INFO - Determining child pids from psutil...
[task 2025-01-27T21:03:24.588Z] 21:03:24     INFO - [761, 762, 767, 791, 792, 795, 800, 808, 941, 942, 943, 944, 945, 1467, 1468]
```