Re: CVS HEAD

> I'm seeing PostgreSQL 7.4.2's postmaster SEGV on startup under 1.5.9-1
> too. AFAICT, the stackdump indicates the problem is in the
> Cygwin DLL.

Well, that confirms things. 7.4.2 includes a repeated call to dup(0) to get
an estimate for the max number of fds, whilst 7.4.1 does not.

Code like that below should not SEGV, IMNSHO. Want me to push this over to
the cygwin list?

#include <errno.h>

int main(void)
{
int i;
for (i = 0; ; i++)
{
printf("i = %d\n",i);
if (dup(0) < 0)
{
printf("dup failed\n");
return -1;
}
}
return 0;
}

> and starting a new job,

Congrats.

Cheers,
Claudio

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FYI, similar problem reported, 21 mar 2004, in
"How many fds can *you* open?"
http://cygwin.com/ml/cygwin/2004-03/msg00984.html

But cfg terminated the thread with rudeness. :(

--- Claudio Natoli <> wrote:
>
>
> > I'm seeing PostgreSQL 7.4.2's postmaster SEGV on
> startup under 1.5.9-1
> > too. AFAICT, the stackdump indicates the problem
> is in the
> > Cygwin DLL.
>
> Well, that confirms things. 7.4.2 includes a
> repeated call to dup(0) to get
> an estimate for the max number of fds, whilst 7.4.1
> does not.
>
> Code like that below should not SEGV, IMNSHO. Want
> me to push this over to
> the cygwin list?
>
>
> #include <errno.h>
>
> int main(void)
> {
> int i;
> for (i = 0; ; i++)
> {
> printf("i = %d\n",i);
> if (dup(0) < 0)
> {
> printf("dup failed\n");
> return -1;
> }
> }
> return 0;
> }
>

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Claudio,

On Wed, Apr 14, 2004 at 10:55:42AM +1000, Claudio Natoli wrote:
> > I'm seeing PostgreSQL 7.4.2's postmaster SEGV on startup under
> > 1.5.9-1 too. AFAICT, the stackdump indicates the problem is in the
> > Cygwin DLL.
>
> Well, that confirms things. 7.4.2 includes a repeated call to dup(0)
> to get an estimate for the max number of fds, whilst 7.4.1 does not.
>
> Code like that below should not SEGV, IMNSHO. Want me to push this
> over to the cygwin list?
>
> [snip]

Yes, I would really appreciate it. And, thanks for tracking this down.

> > and starting a new job,
>
> Congrats.

Thanks. Unfortunately, one of my compromises was significantly less
time for open source. :,(

Jason

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Claudio,

On Wed, Apr 14, 2004 at 07:46:52AM -0400, Jason Tishler wrote:
> On Wed, Apr 14, 2004 at 10:55:42AM +1000, Claudio Natoli wrote:
> > > I'm seeing PostgreSQL 7.4.2's postmaster SEGV on startup under
> > > 1.5.9-1 too. AFAICT, the stackdump indicates the problem is in
> > > the Cygwin DLL.
> >
> > Well, that confirms things. 7.4.2 includes a repeated call to dup(0)
> > to get an estimate for the max number of fds, whilst 7.4.1 does not.
> >
> > Code like that below should not SEGV, IMNSHO. Want me to push this
> > over to the cygwin list?
> >
> > [snip]
>
> Yes, I would really appreciate it. And, thanks for tracking this down.

The following seems to indicate that the problem has been resolved in
a recent snapshot:

http://cygwin.com/ml/cygwin/2004-04/msg00560.html

Would you be willing to try out the latest one and report back?

Thanks,
Jason

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