Download it now!
Bug 86745 - Possible exception/segfault in jurt jpipe.dll under Windows with pipe connection
Summary: Possible exception/segfault in jurt jpipe.dll under Windows with pipe connection
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: sdk (show other bugs)
(earliest affected) Master
Hardware: x86 (IA32) Windows (All)
: medium normal
Assignee: Juergen Funk (CIB)
Whiteboard: target:4.5.0
Depends on:
Reported: 2014-11-26 15:34 UTC by Juergen Funk (CIB)
Modified: 2016-01-11 10:23 UTC (History)
2 users (show)

See Also:
Crash report or crash signature:

Test this exception with this JAVA Class (1.64 MB, application/java-archive)
2014-11-26 15:34 UTC, Juergen Funk (CIB)
a new jpipe.dll for Windows - replace the buggy one by this (11.00 KB, application/x-msdownload)
2015-01-26 20:51 UTC, Christoph Lutz

Note You need to log in before you can comment on or make changes to this bug.
Description Juergen Funk (CIB) 2014-11-26 15:34:18 UTC
Created attachment 110072 [details]
Test this exception with this JAVA Class

On Windows when you start a java-uno-connection via pipe then on some machines you can get the following exception/segfault in the jpipe.dll. 

Detailed Description (sorry for the German UI language settings):
Problemereignisname:	APPCRASH
  Anwendungsname:	javaw.exe
  Anwendungszeitstempel:	50f13a25
  Fehlermodulname:	jpipe.dll
  Fehlermodulzeitstempel:	53bc1d00
  Ausnahmecode:	c00000fd
  Ausnahmeoffset:	000011c7
  Betriebsystemversion:	6.1.7601.
  Gebietsschema-ID:	1031
  Zusatzinformation 1:	022d
  Zusatzinformation 2:	022d20d2f136501747c7b284fa79af41
  Zusatzinformation 3:	171f
  Zusatzinformation 4:	171fb495ef00f99cffbb09f85224e710

The problem is reprocible with LO 4.2.5 and current master.

How to reproduce:

- Download and extracting in your home-dir e.g. C:\Users\<user-name>
- Copy the WollMuxBar.jar in your preferred directory
- Start with:
"c:\Program Files (x86)\Java\jdk1.7.0_67/bin\java.exe" -cp "WollMuxBar.jar;<Your-Path>\lo-core\instdir\URE\java\juh.jar;<Your-Path>\lo-core\instdir\program\classes\unoil.jar" de.muenchen.allg.itd51.wollmux.dialog.WollMuxBar
- Sometimes now the segfault appears

When the bar appears you are a lucky guy, but you were not able to reproduce the bug - it is a sporadic bug.

Analysis result / solution:

In the jpipe.dll DLLMain there's a call to the WinApi's LoadLibraryExW function and that is not allowed. Please see in the Remarks section. It is clearly mentioned there, that the behaviour for such usage is not defined and risky.
Comment 1 Julien Nabet 2014-11-26 21:22:24 UTC
Here's some code pointer I suppose:

Stephan: one for you?
Comment 2 Stephan Bergmann 2014-11-27 08:05:58 UTC
Yes, I faintly remember that the DllMain restrictions were well known when the code was originally written, but it was considered "appears to work anyway."

But should be possible to move the code from DllMain into getFunction.  Jürgen, do you want to work on that?
Comment 3 Juergen Funk (CIB) 2014-11-27 10:47:16 UTC
- Remove the LoadLibrary from DLLMain (from windows not recommended) 
- Set function-ptr variable (faster) 
- Improve the comment why we need two dll's (jpipe.dll and jpipx.dll)

Comment 4 Juergen Funk (CIB) 2014-11-28 13:27:57 UTC
In Patch set 2
i have remove the function pointer
gerrit: see Comment 2
Comment 5 Commit Notification 2014-12-05 13:19:02 UTC
Juergen Funk committed a patch related to this issue.
It has been pushed to "master":

fdo#86745 - Possible exception/segfault in jurt jpipe.dll under Windows ...

It will be available in 4.5.0.

The patch should be included in the daily builds available at in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.
Comment 6 Christoph Lutz 2015-01-26 20:51:31 UTC
Created attachment 112816 [details]
a new jpipe.dll for Windows - replace the buggy one by this
Comment 7 Julien Nabet 2015-12-31 10:19:51 UTC
Juergen: I'm not sure, may we consider this tracker as FIXED or is there some work to do here?
Comment 8 Juergen Funk (CIB) 2016-01-11 09:56:49 UTC
Hi Julien,

this can set to be fixed, it works.
Comment 9 Julien Nabet 2016-01-11 10:23:35 UTC
Thank you Juergen for your feedback.