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PhysicalFileProvider: Avoid NullRef if ResolveLinkTarget returns null #57235

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merged 1 commit into from
Aug 12, 2021
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PhysicalFileProvider: Avoid NullRef if ResolveLinkTarget returns null #57235

merged 1 commit into from
Aug 12, 2021

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jozkee
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@jozkee jozkee commented Aug 11, 2021

Spotted the following exception in #57229 (helix log)

Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.Extensions.FileProviders.Physical.FileSystemInfoHelper.GetFileLinkTargetLastWriteTimeUtc(FileInfo fileInfo) in /_/src/libraries/Microsoft.Extensions.FileProviders.Physical/src/Internal/FileSystemInfoHelper.cs:line 57
   at Microsoft.Extensions.FileProviders.Physical.PollingFileChangeToken.GetLastWriteTimeUtc() in /_/src/libraries/Microsoft.Extensions.FileProviders.Physical/src/PollingFileChangeToken.cs:line 57
   at Microsoft.Extensions.FileProviders.Physical.PollingFileChangeToken.get_HasChanged() in /_/src/libraries/Microsoft.Extensions.FileProviders.Physical/src/PollingFileChangeToken.cs:line 101
   at Microsoft.Extensions.FileProviders.Physical.PhysicalFilesWatcher.RaiseChangeEvents(Object state) in /_/src/libraries/Microsoft.Extensions.FileProviders.Physical/src/PhysicalFilesWatcher.cs:line 455
   at System.Threading.TimerQueueTimer.Fire(Boolean isThreadPool) in /_/src/libraries/System.Private.CoreLib/src/System/Threading/Timer.cs:line 673
   at System.Threading.TimerQueue.FireNextTimers() in /_/src/libraries/System.Private.CoreLib/src/System/Threading/Timer.cs:line 326

@jozkee jozkee added this to the 6.0.0 milestone Aug 11, 2021
@jozkee jozkee self-assigned this Aug 11, 2021
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ghost commented Aug 11, 2021

Tagging subscribers to this area: @maryamariyan, @dotnet/area-extensions-filesystem
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Issue Details

Spotted the following exception in #57229 (helix log)

Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.Extensions.FileProviders.Physical.FileSystemInfoHelper.GetFileLinkTargetLastWriteTimeUtc(FileInfo fileInfo) in /_/src/libraries/Microsoft.Extensions.FileProviders.Physical/src/Internal/FileSystemInfoHelper.cs:line 57
   at Microsoft.Extensions.FileProviders.Physical.PollingFileChangeToken.GetLastWriteTimeUtc() in /_/src/libraries/Microsoft.Extensions.FileProviders.Physical/src/PollingFileChangeToken.cs:line 57
   at Microsoft.Extensions.FileProviders.Physical.PollingFileChangeToken.get_HasChanged() in /_/src/libraries/Microsoft.Extensions.FileProviders.Physical/src/PollingFileChangeToken.cs:line 101
   at Microsoft.Extensions.FileProviders.Physical.PhysicalFilesWatcher.RaiseChangeEvents(Object state) in /_/src/libraries/Microsoft.Extensions.FileProviders.Physical/src/PhysicalFilesWatcher.cs:line 455
   at System.Threading.TimerQueueTimer.Fire(Boolean isThreadPool) in /_/src/libraries/System.Private.CoreLib/src/System/Threading/Timer.cs:line 673
   at System.Threading.TimerQueue.FireNextTimers() in /_/src/libraries/System.Private.CoreLib/src/System/Threading/Timer.cs:line 326

<table>
  <tr>
    <th align="left">Author:</th>
    <td>Jozkee</td>
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  <tr>
    <th align="left">Assignees:</th>
    <td>Jozkee</td>
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    <th align="left">Labels:</th>
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`area-Extensions-FileSystem`

</td>
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    <th align="left">Milestone:</th>
    <td>6.0.0</td>
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LGTM

@danmoseley danmoseley mentioned this pull request Aug 11, 2021
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Wondering whether this is unit testable. (Although clearly other tests will ?sporadically hit it)

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jozkee commented Aug 11, 2021 •
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@danmoseley in theory the steps to test this is have a callback in the Timer's queue AFTER you disposed the Timer (which in this case is triggered by PhysicalFilesWatcher.Dispose() -> Timer.Dispose()) AND the file no longer exists. Not 100% sure how to translate that to code/unit test.

@ChayoteJarocho ChayoteJarocho mentioned this pull request Aug 11, 2021
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danmoseley commented Aug 12, 2021 •
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Lots and lots of staging failures. I went through most

failure in Mono Windows Microsoft.Extensions.Hosting.Tests.ConsoleLifetimeExitTests.EnsureEnvironmentExitDoesntHang already tracked by #57184

The test libraries on Catalyst reports show up as "The Helix Work Item failed. Often this is due to a test crash or infrastructure failure. See the Helix Test Logs tab in the Results page of Azure DevOps." but when I look at artefacts, there's a testResults.Xml present with results in it -- @steveisok ? I think that's more interesting to fix than the actual failures.
example failures

  • hitting the UTF7 issue "Support for UTF-7 is disabled"
  • "System.PlatformNotSupportedException : System.Drawing.Common is not supported on non-Windows platforms
  • TestJapaneseCalendarDateParsing
  • etc

Android has the same issue with not extracting results from the test results XML

these two failures both seem related to appcompat switches?

    <collection total="1" passed="0" failed="1" skipped="0" name="Test collection for System.IO.Tests.Net5CompatSwitchTests" time="0.003">
      <test name="System.IO.Tests.Net5CompatSwitchTests.LegacySwitchIsHonored" type="System.IO.Tests.Net5CompatSwitchTests" method="LegacySwitchIsHonored" time="0.0028879" result="Fail">
        <failure exception-type="Xunit.Sdk.ContainsException">
          <message><![CDATA[Assert.Contains() Failure\nNot found: Net5Compat\nIn value:  System.IO.Strategies.BufferedFileStreamStrategy]]></message>
          <stack-trace><![CDATA[   at System.IO.Tests.Net5CompatSwitchTests.LegacySwitchIsHonored() in /_/src/libraries/System.IO.FileSystem/tests/Net5CompatTests/Net5CompatSwitchTests.cs:line 23
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)]]></stack-trace>
        </failure>

    <collection total="1" passed="0" failed="1" skipped="0" name="Test collection for System.IO.Tests.DisabledFileLockingSwitchTests" time="0.027">
      <test name="System.IO.Tests.DisabledFileLockingSwitchTests.ConfigSwitchIsHonored" type="System.IO.Tests.DisabledFileLockingSwitchTests" method="ConfigSwitchIsHonored" time="0.0268309" result="Fail">
        <failure exception-type="Xunit.Sdk.EqualException">
          <message><![CDATA[Assert.Equal() Failure\nExpected: False\nActual:   True]]></message>
          <stack-trace><![CDATA[   at System.IO.Tests.DisabledFileLockingSwitchTests.ConfigSwitchIsHonored() in /_/src/libraries/System.IO.FileSystem/tests/DisabledFileLockingTests/DisabledFileLockingSwitchTests.cs:line 13
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)]]></stack-trace>

Turkish I

      <test name="System.Tests.CharTests.CasingTest(lowerForm: 'ı', upperForm: 'I', cultureName: \&quot;tr-TR\&quot;)" type="System.Tests.CharTests" method="CasingTest" time="0.0567224" result="Fail">
        <failure exception-type="Xunit.Sdk.EqualException">
          <message><![CDATA[Assert.Equal() Failure\nExpected: 'ı'\nActual:   'i']]></message>
          <stack-trace><![CDATA[   at System.Tests.CharTests.CasingTest(Char lowerForm, Char upperForm, String cultureName) in /_/src/libraries/System.Runtime/tests/System/CharTests.cs:line 1132
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)]]></stack-trace>
        </failure>

various others

No evidence that any of these are caused by this PR. We may be in a bind here where something has broken these specifically because they don't block checkin?

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steveisok commented Aug 12, 2021 •
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@danmoseley #57114 should address these. There was a prior commit that stopped runtimeconfig.json from being processed. On mobile, we generate a bin file from runtimeconfig.json

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@steveisok thanks, following back to what caused that it seems it was #56486 but it looks like staging passed 100% before that was committed?

@danmoseley danmoseley merged commit e0f6071 into dotnet:main Aug 12, 2021
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The only non staging failure was the async one fixed in a parallel PR.

@jozkee jozkee deleted the nullref_physicalfileprovider branch August 12, 2021 00:38
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@carlossanlop carlossanlop carlossanlop approved these changes

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