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Mail Archives: cygwin/2014/09/03/09:38:18

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X-HELO: calimero.vinschen.de
Date: Wed, 3 Sep 2014 15:37:28 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Windows Server 2012R2 64bit and 32bit Cygwin sshd
Message-ID: <20140903133728.GL6056@calimero.vinschen.de>
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On Sep  3 13:02, Achim Gratz wrote:
> Achim Gratz <Stromeko <at> NexGo.DE> writes:
> > > The strace shows that it doesn't even *try* to start bash, but it's
> > > entirely unclear why.
> >=20
> > Is it possible to run sshd in gdb?
>=20
> I can attach the debugger but I didn't manage to break into something use=
ful
> (or anything at all,  really).  However, the bug must be triggered by a r=
ace
> because with the debugger attached once in a blue moon I'll get the comma=
nd
> actually executed correctly.  I'm running this on an 8-core machine, so it
> is very likely that each new thread hits a different core...

You already built your own Cygwin DLL, right?  What you could do is to
do some good old printf debugging.  First let's try to find out if it's
really one of the NetUser calls:

Index: sec_auth.cc
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
RCS file: /cvs/src/src/winsup/cygwin/sec_auth.cc,v
retrieving revision 1.57
diff -u -p -r1.57 sec_auth.cc
--- sec_auth.cc	22 May 2014 16:40:13 -0000	1.57
+++ sec_auth.cc	3 Sep 2014 13:37:11 -0000
@@ -256,8 +256,10 @@ get_user_groups (WCHAR *logonserver, cyg
   NET_API_STATUS ret;
=20
   /* Look only on logonserver */
+  debug_printf ("Before NetUserGetGroups");
   ret =3D NetUserGetGroups (logonserver, user, 0, (LPBYTE *) &buf,
 			  MAX_PREFERRED_LENGTH, &cnt, &tot);
+  debug_printf ("After NetUserGetGroups");
   if (ret)
     {
       __seterrno_from_win_error (ret);
@@ -306,9 +308,11 @@ get_user_local_groups (PWCHAR logonserve
   DWORD cnt, tot;
   NET_API_STATUS ret;
=20
+  debug_printf ("Before NetUserGetLocalGroups");
   ret =3D NetUserGetLocalGroups (logonserver, user, 0, LG_INCLUDE_INDIRECT,
 			       (LPBYTE *) &buf, MAX_PREFERRED_LENGTH,
 			       &cnt, &tot);
+  debug_printf ("After NetUserGetLocalGroups");
   if (ret)
     {
       __seterrno_from_win_error (ret);


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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