Intermittent crash during shutdown in reftests

[jdm]

  ▶ CRASH [expected PASS] /css/CSS2/css1/c5513-ibrdr-bw-000.xht
  │ 
  │ 
  │ 
  │ 
  │ Shutting down the Constellation after generating an output file or exit flag specified
  │ 
  │ 
  │ 
  └ Shutting down the Constellation after generating an output file or exit flag specified

Observed on Linux.

[pshaughn]

Is this always .xht?

[jdm]

Unclear, but I doubt it?

[asajeffrey]

No, I got this on a .html test (https://community-tc.services.mozilla.com/tasks/AceEISiVQ2ek7JCoEIIWEQ/runs/0/logs/https%3A%2F%2Fcommunity-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2FAceEISiVQ2ek7JCoEIIWEQ%2Fruns%2F0%2Fartifacts%2Fpublic%2Ffiltered-wpt-errorsummary.log)

0 matches
1 unexpected results that are NOT known-intermittents:
  ▶ CRASH [expected PASS] /css/css-values/vh-support-transform-translate.html
  │ 
  │ 
  │ 
  │ 
  │ Shutting down the Constellation after generating an output file or exit flag specified
  │ Stack trace for thread "LayoutThread PipelineId { namespace_id: PipelineNamespaceId(1), index: PipelineIndex(1) }"
  └ stack backtrace:

[jdm]

I suspect that segfaults from the layout thread right now are #26129.