[BUG] Non-existent %TEMP% kills Veeam Agent, plus fills drive with logs

[doktornotor]

When %TEMP% directory is missing for a user for some reason, and you go to the Status tab and click on some restore point to get details, or click on a backup in progress, the Veeam Agent GUI freezes and starts filling the %ProgramData%\Veeam\Endpoint directory with UI.Tray-<logged_on_username>.X.log files (a new one gets created once the previous has grown to 10MB - which happens extremely fast).

A short excerpt from those logs:

Code: Select all

[15.11.2018 10:20:05] <01> Error    The directory name is invalid.
[15.11.2018 10:20:05] <01> Error     (System.IO.IOException)
[15.11.2018 10:20:05] <01> Error       at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
[15.11.2018 10:20:05] <01> Error       at System.IO.Path.InternalGetTempFileName(Boolean checkHost)
[15.11.2018 10:20:05] <01> Error       at System.Windows.Input.Cursor.LoadFromStream(Stream cursorStream)
[15.11.2018 10:20:05] <01> Error       at System.Windows.Controls.GridViewColumnHeader.GetCursor(Int32 cursorID)
[15.11.2018 10:20:05] <01> Error       at System.Windows.Controls.GridViewColumnHeader.get_SplitCursor()
[15.11.2018 10:20:05] <01> Error       at System.Windows.Controls.GridViewColumnHeader.UpdateGripperCursor()
[15.11.2018 10:20:05] <01> Error       at System.Windows.Controls.GridViewColumnHeader.CheckWidthForPreviousHeaderGripper()
[15.11.2018 10:20:05] <01> Error       at System.Windows.Controls.GridViewHeaderRowPresenter.ArrangeOverride(Size arrangeSize)
[15.11.2018 10:20:05] <01> Error       at System.Windows.FrameworkElement.ArrangeCore(Rect finalRect)
[15.11.2018 10:20:05] <01> Error       at System.Windows.UIElement.Arrange(Rect finalRect)
[15.11.2018 10:20:05] <01> Error       at System.Windows.Controls.ScrollContentPresenter.ArrangeOverride(Size arrangeSize)
[15.11.2018 10:20:05] <01> Error       at System.Windows.FrameworkElement.ArrangeCore(Rect finalRect)
[15.11.2018 10:20:05] <01> Error       at System.Windows.UIElement.Arrange(Rect finalRect)
[15.11.2018 10:20:05] <01> Error       at System.Windows.Controls.Grid.ArrangeOverride(Size arrangeSize)
[15.11.2018 10:20:05] <01> Error       at System.Windows.FrameworkElement.ArrangeCore(Rect finalRect)
[15.11.2018 10:20:05] <01> Error       at System.Windows.UIElement.Arrange(Rect finalRect)
...

This log spam only stops when you close the Veeam Agent window.

I'd say this should not happen at all, plus can potentially crash the OS once the %SystemDrive% has filled with these extremely spammy logs. (Seen KB1046 so seems like sort of known issue for ages, just the exception handling got much worse, the KB does not mention anything about unusable GUI and filling the OS drive.)

[Dima P.]

Hi Dok.

Thanks for your post, can you please clarify the Veeam Agent for Windows version you are using? Meanwhile I'll check with the QA team and report back. Stay tuned.

[doktornotor]

Well yes, of course. The agent is the latest one available, AFAICT - 2.2.0.589. The issue seems very easily reproducible on any machine I tried.

[Dima P.]

May I ask under which circumstances TEMP folder was removed from the machine?

[doktornotor]

Not exactly sure, probably killed by CCleaner in connection with this "genius" Remote Desktop "feature" invented by MS... Does not matter anyway, a missing, super-easy to re-create directory shouldn't be breaking software.

[Dima P.]

Understood. We've noted a bug based on your report, thanks again!

[doktornotor]

Thanks as well.