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-----Original Message-----
From: [email protected]
[mailto:[email protected]]
Sent: Thursday, April 04, 2002 2:01 PM
To: [email protected]
Subject: Linux-IA64 digest, Vol 1 #586 - 12 msgs

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Today's Topics:

1. Re: SIGILL errors in strncpu (NAT consumption) (Erich Focht)
2. Re: SIGILL errors in strncpu (NAT consumption) (David Mosberger)
3. Re: SIGILL errors in strncpu (NAT consumption) (Jack Steiner)
4. Re: SIGILL errors in strncpu (NAT consumption) (Francois-Xavier
Kowalski)
5. Re: [util-linux] [Linux-ia64] mkswap.c ia64 fix [patch]
([email protected])
6. Re: SIGILL errors in strncpu (NAT consumption) (Hideki Yamamoto)
7. pipe() not setting errno. (=?windows-1252?Q?Anders Herbjørnsen?=)
8. Re: pipe() not setting errno. (Andreas Schwab)
9. Re: SIGILL errors in strncpu (NAT consumption) (David Mosberger)
10. Re: SIGILL errors in strncpu (NAT consumption) (David Mosberger)
11. Re: SIGILL errors in strncpu (NAT consumption) (Erich Focht)
12. Re: SIGILL errors in strncpu (NAT consumption) (David Mosberger)

--__--__--

Message: 1
Date: Wed, 3 Apr 2002 23:29:58 +0200 (MEST)
From: Erich Focht <[email protected]>
To: Jack Steiner <[email protected]>
cc: [email protected], [email protected],
"Luck, Tony" <[email protected]>
Subject: Re: [Linux-ia64] SIGILL errors in strncpu (NAT consumption)

I've seen NaT consumption faults with an ISV application in a loop involving speculative loads, too. It was very hard to trace back (occured at different simulation times in a huge case) and disappeared after we rewrote the loop and used the latest Intel Fortran compiler. It occured with both B3 and C0 CPUs under 2.4.7 and 2.4.17. I don't have a testcase for this, sorry.

Regards,
Erich

--__--__--

Message: 2
From: David Mosberger <[email protected]>
Date: Wed, 3 Apr 2002 14:10:42 -0800
To: Erich Focht <[email protected]>
Cc: Jack Steiner <[email protected]>, [email protected],
[email protected], "Luck, Tony" <[email protected]>
Subject: Re: [Linux-ia64] SIGILL errors in strncpu (NAT consumption)
Reply-To: [email protected]

<[email protected]> said:

Erich> I've seen NaT consumption faults with an ISV application in a Erich> loop involving speculative loads, too. It was very hard to Erich> trace back (occured at different simulation times in a huge Erich> case) and disappeared after we rewrote the loop and used the Erich> latest Intel Fortran compiler. It occured with both B3 and C0 Erich> CPUs under 2.4.7 and 2.4.17. I don't have a testcase for Erich> this, sorry.

It's due to a glibc bug that was introduced last August when strncpy() was rewritten. I sent a bug report (and preliminary patch) to the author and am waiting to hear back.

	--david

--__--__--

Message: 3
From: Jack Steiner <[email protected]>
Subject: Re: [Linux-ia64] SIGILL errors in strncpu (NAT consumption)
To: [email protected]
Date: Wed, 3 Apr 2002 15:43:37 -0600 (CST)

I isolated the strncpy problem to a simple test program. It fails with the new glibc-2.2.4-19.3 within a few seconds.

Works fine with older versions of glibc.

David Mosberger took a look at the strncpy code & spotted the error:

From David:

----
Test case - run ~12 copies of this in parallel.

#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <time.h>

char *dest, *src;

void
sigill_handler(int sig)

{
        fprintf(stderr,"SIGILL: pid %d, dest 0x%lx, src 0x%lx\n",
                getpid(), (long)dest, (long)src);
        exit(1);
}

int
main() {
time_t temp1;
char *p, buffer[1024];

  signal(SIGILL, sigill_handler);
  
  time(&temp1);
  src = ctime(&temp1);

  dest = buffer;

  printf("%d\n", strlen(src));

while(1)

      strncpy(buffer,src,strlen(src));
}

Thanks

Jack Steiner    (651-683-5302)   (vnet 233-5302)      [email protected]



--__--__--

Message: 4
Date: Thu, 04 Apr 2002 10:36:20 +0200
From: Francois-Xavier Kowalski <[email protected]>
Reply-To: [email protected]
Organization: Hewlett-Packard
To: [email protected]
Subject: Re: [Linux-ia64] SIGILL errors in strncpu (NAT consumption)

Do you have the bug-report ID on GNATS? I am not able to find it in the database to known if it is being worked-out by the maintainer.

FiX

Francois-Xavier "FiX" KOWALSKI





--__--__--

Message: 5
From: [email protected]
Date: Thu, 4 Apr 2002 10:25:10 GMT
To: [email protected], [email protected]
Subject: Re: [util-linux] [Linux-ia64] mkswap.c ia64 fix  [patch]
Cc: [email protected], [email protected]

Thanks! Applied.
Andries

--__--__--

Message: 6
Date: Thu, 04 Apr 2002 19:29:46 +0900
From: "Hideki Yamamoto" <[email protected]>
To: [email protected]
Subject: Re: [Linux-ia64] SIGILL errors in strncpu (NAT consumption)

Hi there,

I have a favor to ask David.
If possible, plase give me the patch you had resolved this problem. I have been looking for the patch in all email(linux-ia64) but I could not find this patch.

Thanks.

though,

--__--__--

Message: 7
From: =?windows-1252?Q?Anders Herbjørnsen?<[email protected]>
To: [email protected]
Date: Thu, 04 Apr 2002 13:48:50 +0200
Subject: [Linux-ia64] pipe() not setting errno.

Hello,

When running out of file descriptors pipe() does return -1 but errno is not set. This is working ok on IA32 systems, but fails on IA64. I've tested this with kernels 2.4.9 and 2.4.18.

Below is a small sample program to illustrate the problem:

########################################################
#include <stdio.h>
#include <errno.h>
#include <unistd.h>

int main (int argc, char **argv){
int i;

  for (i = 0; i < 3000; i++) {
    int fd[2];
    if (-1 = pipe(fd))
      break;
    printf ("%d ", i);

} /* for */
printf ("\npipe number %d error: errno=%d\n", i, errno); return errno;
}
#############################################################

Sample run:

$ ulimit -n 12
$ ./tpipe
0 1 2 3
pipe number 4 error: errno=0

Regards
Anders Herbjørnsen

--__--__--

Message: 8
To: Anders =?iso-8859-1?q?Herbjørnsen?= <[email protected]>
Cc: [email protected], [email protected]
Subject: Re: [Linux-ia64] pipe() not setting errno.
From: Andreas Schwab <[email protected]>
Date: Thu, 04 Apr 2002 15:36:29 +0200

Anders Herbjørnsen <[email protected]> writes:

|> Hello,
|> 
|> When running out of file descriptors pipe() does return -1 but
|> errno is not set. This is working ok on IA32 systems, but fails
|> on IA64. I've tested this with kernels 2.4.9 and 2.4.18.

It's a bug in glibc, this should fix it:

2002-04-04 Andreas Schwab <[email protected]>

* sysdeps/unix/sysv/linux/ia64/pipe.S: Don't overwrite r8 on error.

--- sysdeps/unix/sysv/linux/ia64/pipe.S.~1.2.~ 2001-07-16
10:45:29.000000000 +0200
+++ sysdeps/unix/sysv/linux/ia64/pipe.S 2002-04-04 14:35:31.000000000 +0200
@@ -1,4 +1,4 @@
-/* Copyright (C) 1999, 2000 Free Software Foundation, Inc. +/* Copyright (C) 1999, 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David Mosberger <[email protected]>

@@ -28,7 +28,7 @@

        cmp.ne p6,p0=-1,r10
        ;;
 (p6)   st4 [r2]=r8,4
-       mov ret0=0
+(p6)   mov ret0=0
        ;;

(p6) st4 [r2]=r9
(p6) ret

Andreas.

Andreas Schwab, SuSE Labs, [email protected]
SuSE GmbH, Deutschherrnstr. 15-19, D-90429 Nürnberg
Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."


--__--__--

Message: 9
From: David Mosberger <[email protected]>
Date: Thu, 4 Apr 2002 07:54:57 -0800
To: "Hideki Yamamoto" <[email protected]>
Cc: [email protected]
Subject: Re: [Linux-ia64] SIGILL errors in strncpu (NAT consumption)
Reply-To: [email protected]

<[email protected]> said:

Hideki> I have a favor to ask David. If possible, plase give me Hideki> the patch you had resolved this problem. I have been looking Hideki> for the patch in all email(linux-ia64) but I could not find Hideki> this patch.

Jack just sent the patch. Caveat: it has not been tested much. You may be better off reverting to the pre-August 2001 version of strncpy() if stability is what you want.

	--david

--__--__--

Message: 10
From: David Mosberger <[email protected]>
Date: Thu, 4 Apr 2002 10:44:31 -0800
To: [email protected]
Cc: [email protected]
Subject: Re: [Linux-ia64] SIGILL errors in strncpu (NAT consumption)
Reply-To: [email protected]

<[email protected]> said:

Francois-Xavier> Do you have the bug-report ID on GNATS? I am not Francois-Xavier> able to find it in the database to known if it is Francois-Xavier> being worked-out by the maintainer.

No, I don't. I just reported it to Jakub Jelenik.

	--david

--__--__--

Message: 11
Date: Thu, 4 Apr 2002 21:27:58 +0200 (MEST)
From: Erich Focht <[email protected]>
To: [email protected]
cc: Jack Steiner <[email protected]>, [email protected],
"Luck, Tony" <[email protected]>
Subject: Re: [Linux-ia64] SIGILL errors in strncpu (NAT consumption)

The error I've seen didn't have anything to do with strncpy(), the loop where the strange SIGILL and "NaT consumption" came from was:

      DO 502 IB=1,NBCUT0
      if(IB.GT.NBNCST.AND.IB.LE.NBNCEN) GO TO 502
      IP1=LCU(1,IB)
      IP2=LCU(2,IB)
      IF(LQ(1,IP1).LT.-NBC.OR.LQ(1,IP2).LT.-NBC) GO TO 502
      IDP1=NDIR(ICU(1,IB))
      LQ(IDP1,IP1)=LCB(1,IB)
      IDP2=NDIR(ICU(2,IB))
      LQ(IDP2,IP2)=LCB(2,IB)

502 CONTINUE

You shouldn't blame me for the first IF condition, it's a third party (ISV) code. The assembler code produced by the Fortran compiler looked correct.

What change did you make for strncpy()? Did it somehow produce a NaT somewhere where it could influence a Fortran program? I'd like to understand whether the problem comes from a strange combination of instructions or somehow propagates from glibc. Splitting the loop and eliminating the first IF helped in this case, so it's improbable that strncpy() is related to this.

Thanks,
best regards,
Erich

--__--__--

Message: 12
From: David Mosberger <[email protected]>
Date: Thu, 4 Apr 2002 11:31:43 -0800
To: Erich Focht <[email protected]>
Cc: [email protected], Jack Steiner <[email protected]>,

        [email protected], "Luck, Tony" <[email protected]>

Subject: Re: [Linux-ia64] SIGILL errors in strncpu (NAT consumption)
Reply-To: [email protected]

<[email protected]> said:

Erich> What change did you make for strncpy()? Did it somehow Erich> produce a NaT somewhere where it could influence a Fortran Erich> program? I'd like to understand whether the problem comes Erich> from a strange combination of instructions or somehow Erich> propagates from glibc.

The glibc routine simply was buggy. Garbage in, garbage out, not surprise here. I suspect your Fortran problem is something entirely different.

	--david

--__--__--

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