[ubuntu-mono] [Bug 1293481] Re: asp.net 4.0 with apache does not seem to work on trusty

Tue Mar 18 11:55:23 UTC 2014

I have some additional information on this bug - not anything like a
solution, but an idea about the direction in which to search.

As was clear from the original posting, the crash occurs in
Mono.WebServer.VPathToHost.CreateHost.  I have now narrowed it down to
the call of System.Web.Hosting.ApplicationHost.CreateApplicationHost, to
be precise, in line 150.  Test output determines that the program
reaches the point of this call, but the call never returns.

Now, CreateApplicationHost is part of mono, not of xsp. So I went and
added an exception throw to CreateApplicationHost, as the very first
thing to do, compiled and installed the modified System.Web.dll and
tried again.  No change, the mod-mono-server4 still crashes the same
way.

On the other hand, if I earlier ran the application through xsp4, it has
always gone fine - until I made this change - now it crashes, but with
my exception.  This was just to ensure that I hadn't bungled up the
modification of System.Web.dll.

So to my thinking the real problem is actually in calling a method in a
standard Mono .NET module.  Could it be related to the fact that
CreateApplicationHost is compiled as UnManagedCode?  or some of the
security issues around CreateApplicationHost?  It is hard to imagine,
and even harder to imagine why it works fine in xsp4 but crashes so
spectacularly in mod-mono-server4.  After all, much of the code
(including the calling method, VPathToHost.CreateHost) is shared between
the two solutions.

best regards

                              --peder chr.

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https://bugs.launchpad.net/bugs/1293481

Title:
  asp.net 4.0 with apache does not seem to work on trusty

Status in “xsp” package in Ubuntu:
  New

Bug description:
  This is a sister-bug to #1292567 which reports a similar problem with
  asp.net 2.0.  I have created two different reports, because the faults
  manifests themselves very differently, depending on the asp.net
  version.

  I have created an extremely small ASP.NET application (attached as a
  tar file).

  When I run that against the apache server on "saucy salamander", using
  mono-server4, it runs just fine.

  When I run it against the apache server on the current beta of "trusty
  tahr", using mono-server4, the mono-server4 dies with a SIGABRT.  The
  client gets a "500" error and the mono process running
  /usr/lib/mono/4.5/mod-mono-server4.exe disappears from the system.

  Luckily there is a good description in the apache error log:

  Stacktrace:

    at <unknown> <0xffffffff>
    at Mono.WebServer.VPathToHost.CreateHost (Mono.WebServer.ApplicationServer,Mono.WebServer.WebSource) <0x0007b>
    at Mono.WebServer.ApplicationServer.GetApplicationForPath (string,int,string,bool) <0x0013f>
    at (wrapper remoting-invoke-with-check) Mono.WebServer.ApplicationServer.GetApplicationForPath (string,int,string,bool) <0xffffffff>
    at Mono.WebServer.ModMonoWorker.InnerRun (object) <0x0024f>
    at Mono.WebServer.ModMonoWorker.Run (object) <0x0001b>
    at (wrapper runtime-invoke) <Module>.runtime_invoke_void__this___object (object,intptr,intptr,intptr) <0xffffffff>

  Native stacktrace:

          /usr/bin/mono() [0x8105b4a]
          [0xb77bb40c]
          [0xb77bb424]
          /lib/i386-linux-gnu/libc.so.6(gsignal+0x46) [0xb75ba7e6]
          /lib/i386-linux-gnu/libc.so.6(abort+0x143) [0xb75bdc33]
          /usr/bin/mono() [0x8288b23]
          /usr/bin/mono() [0x8288bb3]
          /usr/bin/mono() [0x816b4d1]
          /usr/bin/mono(mono_class_get_full+0xff) [0x816bdff]
          /usr/bin/mono(mono_class_from_name+0x107) [0x816c237]
          /usr/bin/mono(mono_class_from_typeref+0x190) [0x816b9a0]
          /usr/bin/mono(mono_class_get_full+0x164) [0x816be64]
          /usr/bin/mono(mono_class_get+0x1f) [0x816bf4f]
          /usr/bin/mono(mono_metadata_parse_mh_full+0x45c) [0x81b29fc]
          /usr/bin/mono(mono_method_get_header+0xbf) [0x819130f]
          /usr/bin/mono() [0x807ff7c]
          /usr/bin/mono() [0x8066ccc]
          /usr/bin/mono() [0x8068de4]
          /usr/bin/mono() [0x8069aee]
          /usr/bin/mono() [0x8106d17]
          [0xb757903e]
          [0xb5816970]
          [0xb58167fc]
          [0xb5812aa8]
          [0xb58126c4]
          [0xb7466c9d]
          /usr/bin/mono() [0x8069bf0]

  Debug info from gdb:

  =================================================================
  Got a SIGABRT while executing native code. This usually indicates
  a fatal error in the mono runtime or one of the native libraries 
  used by your application.
  =================================================================

  So, as you see, the SIGABRT occurs in a basic mono runtime routine called from the mod-mono-server4.exe
  module.  Of course, I cannot know whether the bug that causes the abortion is in xsp or in basic mono.  But 
  any search after the bug would start in mod-mono-server4, so I chose to file the bug against that package.

  I have the same bug on my company's larger ASP.NET application.

  This report is not made from the "trusty" installation, that one is a
  test installation without access to the net, so you don't get all the
  stuff that apport would collect to you. Honestly, you don't need it to
  reproduce, just grab a pristine trusty installation and try it!

  However, a few important package versions:

  libapache2-mod-mono: 2.11+git20130708.6b73e85-4ubuntu1
  mono-complete: 3.2.8+dfsg-4ubuntu1
  mono-apache-server2: 3.0.11-1

  I am willing to offer any possible kind of assistance in fixing this
  problem - my company had looked forward to upgrade to "trusty". But,
  to be honest, I don't think you really need my help - the problem is
  so trivial to reproduce, it ought to be pretty trivial to fix if you
  know the ropes.

  best regards

  Peder Chr. Nørgaard

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