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Date: Sun, 22 Apr 2001 23:13:52 +0200
From: Corinna Vinschen <vinschen AT redhat DOT com>
To: Corinna Vinschen <cygwin-developers AT cygwin DOT com>
Subject: Re: SHOWSTOPPER: [was Re: vfscanf in newlib]
Message-ID: <20010422231352.U15499@cygbert.vinschen.de>
Reply-To: Corinna Vinschen <cygwin-developers AT cygwin DOT com>
Mail-Followup-To: Corinna Vinschen <cygwin-developers AT cygwin DOT com>
References: <987861904 DOT 20126 DOT ezmlm AT sources DOT redhat DOT com> <3AE1C5B2 DOT B63F2B54 AT ece DOT gatech DOT edu> <20010422223317 DOT S15499 AT cygbert DOT vinschen DOT de>
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In-Reply-To: <20010422223317.S15499@cygbert.vinschen.de>; from vinschen@redhat.com on Sun, Apr 22, 2001 at 10:33:17PM +0200

On Sun, Apr 22, 2001 at 10:33:17PM +0200, Corinna Vinschen wrote:
> On Sat, Apr 21, 2001 at 01:38:58PM -0400, Charles S. Wilson wrote:
> > > On Sat, Apr 21, 2001 at 01:21:30AM -0400, Charles Wilson wrote:
> > > > I've just discovered that I get a coredump with all three when I try to
> > > > run ssh.  #$!@&$
> > > 
> > > I just build the latest from CVS and it's running fine, even ssh and
> > > sshd.
> > > 
> > > Corinna
> > 
> > Thank you.  I guess that means the answer from my email is #3: I've
> > somehow lost the ability to build a working cygwin snapshot from a
> > perfectly good codebase.  Funny, I don't remember the surgeon saying
> > "Ooops" during my recent brain surgery.... :-)
> 
> Sorry Chuck, it seems I haven't tried to build from the latest sources.
> You're right, the latest code fails to run sshd. It dies with an access
> violation on each connect.
> 
> I tracked it down to Robert's changes. Somewhere here:
> [...]
>         * passwd.cc (getpwuid): Check for thread cancellation.
>         (getpwuid_r): Ditto.
>         (getpwname): Ditto.
>         (getpwnam_r): Ditto.

The above four calls to pthread_testcancel() are the problem. I've
further tracked them down to the __pthread_testcancel() function.
The following patch solves the problem.

Robert? Chris? Ok to checkin?


Sun Apr 22 23:12:00 2001 Corinna Vinschen <corinna AT vinschen DOT de>

	* thread.cc (__pthread_testcancel): Avoid using NULL thread
	pointer.

Index: thread.cc
===================================================================
RCS file: /cvs/src/src/winsup/cygwin/thread.cc,v
retrieving revision 1.26
diff -u -p -r1.26 thread.cc
--- thread.cc   2001/04/21 23:26:14     1.26
+++ thread.cc   2001/04/22 21:10:29
@@ -1069,7 +1069,7 @@ void
 __pthread_testcancel (void)
 {
   class pthread *thread = __pthread_self ();
-  if (thread->cancelstate == PTHREAD_CANCEL_DISABLE)
+  if (thread && thread->cancelstate == PTHREAD_CANCEL_DISABLE)
     return;
   /* check the cancellation event object here - not neededuntil pthread_cancel actually
    * does something*/

Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin AT cygwin DOT com
Red Hat, Inc.