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Bug#855606: marked as done (sqrt() regression on powerpc/jessie)

Your message dated Tue, 25 Apr 2017 19:47:13 +0000
with message-id <E1d36Qb-0009Cc-RS@fasolo.debian.org>
and subject line Bug#855606: fixed in glibc 2.19-18+deb8u8
has caused the Debian Bug report #855606,
regarding sqrt() regression on powerpc/jessie
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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-- 
855606: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=855606
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: libc6
Version: 2.19-18+deb8u7
Severity: normal
Tags: jessie

The following C program produces different output on Jessie and Sid. I
believe the Sid output is the correct one, and in fact this is the
output that has been observed for the "point" (and "polygon")
regression tests for PostgreSQL on all platforms for the last 20 years
since the test got added.


$ cat sqrt.c
#include <math.h>
#include <stdio.h>
#include <fenv.h>

double
pg_hypot(double x, double y)
{
    double      yx;

    /* Some PG-specific code deleted here */

    /* Else, drop any minus signs */
    x = fabs(x);
    y = fabs(y);

    /* Swap x and y if needed to make x the larger one */
    if (x < y)
    {
        double      temp = x;

        x = y;
        y = temp;
    }

    /*
     * If y is zero, the hypotenuse is x.  This test saves a few cycles in
     * such cases, but more importantly it also protects against
     * divide-by-zero errors, since now x >= y.
     */
    if (y == 0.0)
        return x;

    /* Determine the hypotenuse */
    yx = y / x;
    return x * sqrt(1.0 + (yx * yx));
}


int main ()
{
        //fesetround(FE_TONEAREST);
        printf("fegetround is %d\n", fegetround());
        double r = pg_hypot(10.0, 10.0);
        printf("14 %.14g\n", r);
        printf("15 %.15g\n", r);
        printf("16 %.16g\n", r);
        printf("17 %.17g\n", r);
        return 0;
}


Jessie output:
fegetround is 0
14 14.142135623731
15 14.1421356237309
16 14.14213562373095
17 14.142135623730949

Sid output:
fegetround is 0
14 14.142135623731
15 14.142135623731
16 14.14213562373095
17 14.142135623730951


The Sid output is also observed when running the binary compiled on
Jessie on Sid, so it's a library issue, not a compiler/binary one.


The problem might be due to the fix for #843904.


FTBFS in postgresql-9.4 in jessie-pu:
https://buildd.debian.org/status/fetch.php?pkg=postgresql-9.4&arch=powerpc&ver=9.4.11-0%2Bdeb8u1&stamp=1487473754&raw=0
FTBFS in postgresql-9.6 in jessie-backports:
https://buildd.debian.org/status/fetch.php?pkg=postgresql-9.6&arch=powerpc&ver=9.6.1-2~bpo8%2B1&stamp=1485184696&raw=0

Thread on pgsql-hackers:
https://www.postgresql.org/message-id/20170220155819.m2s43pf2pvkes4pc%40msg.credativ.de

Christoph

Attachment: signature.asc
Description: PGP signature


--- End Message ---
--- Begin Message --- 
Source: glibc
Source-Version: 2.19-18+deb8u8

We believe that the bug you reported is fixed in the latest version of
glibc, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 855606@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Aurelien Jarno <aurel32@debian.org> (supplier of updated glibc package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Format: 1.8
Date: Mon, 24 Apr 2017 06:41:38 +0200
Source: glibc
Binary: libc-bin libc-dev-bin glibc-doc glibc-source locales locales-all nscd multiarch-support libc6 libc6-dev libc6-dbg libc6-pic libc6-udeb libc6.1 libc6.1-dev libc6.1-dbg libc6.1-pic libc6.1-udeb libc0.3 libc0.3-dev libc0.3-dbg libc0.3-pic libc0.3-udeb libc0.1 libc0.1-dev libc0.1-dbg libc0.1-pic libc0.1-udeb libc6-i386 libc6-dev-i386 libc6-sparc libc6-dev-sparc libc6-sparc64 libc6-dev-sparc64 libc6-s390 libc6-dev-s390 libc6-amd64 libc6-dev-amd64 libc6-powerpc libc6-dev-powerpc libc6-ppc64 libc6-dev-ppc64 libc6-mips32 libc6-dev-mips32 libc6-mipsn32 libc6-dev-mipsn32 libc6-mips64 libc6-dev-mips64 libc0.1-i386 libc0.1-dev-i386 libc6-x32 libc6-dev-x32 libc6-i686 libc6-xen libc0.1-i686 libc0.3-i686 libc0.3-xen libc6.1-alphaev67 libc6-loongson2f libnss-dns-udeb libnss-files-udeb
Architecture: source all
Version: 2.19-18+deb8u8
Distribution: stable
Urgency: medium
Maintainer: Aurelien Jarno <aurel32@debian.org>
Changed-By: Aurelien Jarno <aurel32@debian.org>
Description:
 glibc-doc  - GNU C Library: Documentation
 glibc-source - GNU C Library: sources
 libc-bin   - GNU C Library: Binaries
 libc-dev-bin - GNU C Library: Development binaries
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 libc0.1-i386 - GNU C Library: 32bit shared libraries for AMD64
 libc0.1-i686 - GNU C Library: Shared libraries [i686 optimized]
 libc0.1-pic - GNU C Library: PIC archive library
 libc0.1-udeb - GNU C Library: Shared libraries - udeb (udeb)
 libc0.3    - GNU C Library: Shared libraries
 libc0.3-dbg - GNU C Library: detached debugging symbols
 libc0.3-dev - GNU C Library: Development Libraries and Header Files
 libc0.3-i686 - GNU C Library: Shared libraries [i686 optimized]
 libc0.3-pic - GNU C Library: PIC archive library
 libc0.3-udeb - GNU C Library: Shared libraries - udeb (udeb)
 libc0.3-xen - GNU C Library: Shared libraries [Xen version]
 libc6      - GNU C Library: Shared libraries
 libc6-amd64 - GNU C Library: 64bit Shared libraries for AMD64
 libc6-dbg  - GNU C Library: detached debugging symbols
 libc6-dev  - GNU C Library: Development Libraries and Header Files
 libc6-dev-amd64 - GNU C Library: 64bit Development Libraries for AMD64
 libc6-dev-i386 - GNU C Library: 32-bit development libraries for AMD64
 libc6-dev-mips32 - GNU C Library: o32 Development Libraries for MIPS
 libc6-dev-mips64 - GNU C Library: 64bit Development Libraries for MIPS64
 libc6-dev-mipsn32 - GNU C Library: n32 Development Libraries for MIPS64
 libc6-dev-powerpc - GNU C Library: 32bit powerpc development libraries for ppc64
 libc6-dev-ppc64 - GNU C Library: 64bit Development Libraries for PowerPC64
 libc6-dev-s390 - GNU C Library: 32bit Development Libraries for IBM zSeries
 libc6-dev-sparc - GNU C Library: 32bit Development Libraries for SPARC
 libc6-dev-sparc64 - GNU C Library: 64bit Development Libraries for UltraSPARC
 libc6-dev-x32 - GNU C Library: X32 ABI Development Libraries for AMD64
 libc6-i386 - GNU C Library: 32-bit shared libraries for AMD64
 libc6-i686 - GNU C Library: Shared libraries [i686 optimized]
 libc6-loongson2f - GNU C Library: Shared libraries (Loongson 2F optimized)
 libc6-mips32 - GNU C Library: o32 Shared libraries for MIPS
 libc6-mips64 - GNU C Library: 64bit Shared libraries for MIPS64
 libc6-mipsn32 - GNU C Library: n32 Shared libraries for MIPS64
 libc6-pic  - GNU C Library: PIC archive library
 libc6-powerpc - GNU C Library: 32bit powerpc shared libraries for ppc64
 libc6-ppc64 - GNU C Library: 64bit Shared libraries for PowerPC64
 libc6-s390 - GNU C Library: 32bit Shared libraries for IBM zSeries
 libc6-sparc - GNU C Library: 32bit Shared libraries for SPARC
 libc6-sparc64 - GNU C Library: 64bit Shared libraries for UltraSPARC
 libc6-udeb - GNU C Library: Shared libraries - udeb (udeb)
 libc6-x32  - GNU C Library: X32 ABI Shared libraries for AMD64
 libc6-xen  - GNU C Library: Shared libraries [Xen version]
 libc6.1    - GNU C Library: Shared libraries
 libc6.1-alphaev67 - GNU C Library: Shared libraries (EV67 optimized)
 libc6.1-dbg - GNU C Library: detached debugging symbols
 libc6.1-dev - GNU C Library: Development Libraries and Header Files
 libc6.1-pic - GNU C Library: PIC archive library
 libc6.1-udeb - GNU C Library: Shared libraries - udeb (udeb)
 libnss-dns-udeb - GNU C Library: NSS helper for DNS - udeb (udeb)
 libnss-files-udeb - GNU C Library: NSS helper for files - udeb (udeb)
 locales    - GNU C Library: National Language (locale) data [support]
 locales-all - GNU C Library: Precompiled locale data
 multiarch-support - Transitional package to ensure multiarch compatibility
 nscd       - GNU C Library: Name Service Cache Daemon
Closes: 796106 855606
Changes:
 glibc (2.19-18+deb8u8) stable; urgency=medium
 .
   [ Aurelien Jarno ]
   * Update from upstream stable branch:
     - Fix PowerPC sqrt inaccuracy.  Closes: #855606.
   * patches/any/cvs-resolv-internal-qtype.diff: patch from upstream to fix a
     NULL pointer dereference in libresolv when receiving a T_UNSPEC internal
     QTYPE (CVE-2015-5180).  Closes: #796106.
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