Bug 46683 - Recurring hang in System.Xaml on CI
Summary: Recurring hang in System.Xaml on CI
Alias: None
Product: Class Libraries
Classification: Mono
Component: System (show other bugs)
Version: unspecified
Hardware: PC Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Alexander Köplinger [MSFT]
Depends on:
Reported: 2016-11-09 22:29 UTC by Andi McClure
Modified: 2018-02-22 22:05 UTC (History)
4 users (show)

See Also:
Is this bug a regression?: ---
Last known good build:


Description Andi McClure 2016-11-09 22:29:02 UTC
Four times in the last week there has been a hang in the System.Xaml in the CI tests. XamlBackgroundReader tests. Two on Linux/Intel64, two on Linux/Intel32. The most recent was today.

There is a set of tests that all call into a ReadTest() function, which does nothing but take in a path and reads it in the background. The failure is always one of these tests. The hang always occurs in XamlBackgroundReader.Read (), which WaitOnes on its ManualResetEvent and never gets woken up. See:


Koeplinger reviewed and believed this is an issue for the class library team.
Comment 1 Marek Safar 2018-02-22 22:05:21 UTC
We track flaky issues differently now

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