--- Begin Message ---
Package: libc0.1
Version: 2.13-38+deb7u2
X-Debbugs-CC: jtaylor.debian@googlemail.com , debian-bsd@lists.debian.org
On Sat, 6 Sep 2014, Julian Taylor wrote:
I encountered a weird issue on kfreebsd i386 using pthreads. It seems to
change the x87 fpu precision mode (bits 8 and 9 of the control word) in
threads compared to the master. In the master its set to extended
precision, in child threads it changes to double precision. This breaks
equality of e.g. python-numpy's threaded and serial random number generator.
Is this expected? it doesn't happen on linux i386.
The thread started in kernel have different default precision
in FreeBSD compared to Linux.
The initial value of precision is set-up before main() starts,
but not in each thread.
We should think about how it should be fixed.
The new thread should either inherit FPU control word from parent, or it
should be created with the same value as original main().
Julian, please, could you verify behaviour of linux-i386 ?
Hint:
typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__HI__)));
#define _FPU_GETCW(cw) __asm__ __volatile__ ("fnstcw %0" : "=m" (*&cw))
#define _FPU_SETCW(cw) __asm__ __volatile__ ("fldcw %0" : : "m" (*&cw))
test with values 0x037f, 0x027f, 0x007f
To reproduce use this simple file and gdb on fischer.debian.org:
$ cat test.c
#include <pthread.h>
#include <stdio.h>
void *thread_fun(void *x_void_ptr)
{
printf("thread\n");
return NULL;
}
int main()
{
pthread_t thread;
if(pthread_create(&thread, NULL, thread_fun, NULL)) {
fprintf(stderr, "Error creating thread\n");
return 1;
}
if(pthread_join(thread, NULL)) {
fprintf(stderr, "Error joining thread\n");
return 2;
}
return 0;
}
$ gcc test.c -g -pthreads
$ gdb ./a.out
(gdb) break main
Breakpoint 1 at 0x8048589: file test.c, line 14.
(gdb) break thread_fun
Breakpoint 2 at 0x8048561: file test.c, line 6.
(gdb) r
Starting program: /home/jtaylor/a.out
Breakpoint 1, main () at test.c:14
14 if(pthread_create(&thread, NULL, thread_fun, NULL)) {
(gdb) p $fctrl
$1 = 4991
(gdb) c
Continuing.
Breakpoint 2, thread_fun (x_void_ptr=0x0) at test.c:6
6 printf("thread\n");
(gdb) p $fctrl
$2 = 4735
--- End Message ---
--- Begin Message ---
Source: glibc
Source-Version: 2.19-11
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 761175@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: SHA256
Format: 1.8
Date: Fri, 12 Sep 2014 23:49:50 +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-prof libc6-pic libc6-udeb libc6.1 libc6.1-dev libc6.1-dbg libc6.1-prof libc6.1-pic libc6.1-udeb libc0.3 libc0.3-dev libc0.3-dbg libc0.3-prof libc0.3-pic libc0.3-udeb libc0.1 libc0.1-dev libc0.1-dbg libc0.1-prof 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 amd64
Version: 2.19-11
Distribution: unstable
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
libc0.1 - GNU C Library: Shared libraries
libc0.1-dbg - GNU C Library: detached debugging symbols
libc0.1-dev - GNU C Library: Development Libraries and Header Files
libc0.1-dev-i386 - GNU C Library: 32bit development libraries for AMD64
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-prof - GNU C Library: Profiling Libraries
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-prof - GNU C Library: Profiling Libraries
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
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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-prof - GNU C Library: Profiling Libraries
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-prof - GNU C Library: Profiling Libraries
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: 759495 759568 760076 760092 761175
Changes:
glibc (2.19-11) unstable; urgency=medium
.
[ Samuel Thibault ]
* patches/hurd-i386/tg-thread-cancel.diff: Update patch against two other
overzealous assertions.
* patches/hurd-i386/submitted-bind_umask.diff: Split into cvs-bind_umask.diff
and submitted-bind_umask2.diff as requested by upstream.
* patches/hurd-i386/cvs-fork_ss_hang.diff: New patch which fixes some dash
hangs.
* patches/hurd-i386/cvs-libpthread_guardsize.diff: Add another guard size
computation fix. Fixes gcj's boehm-gc. Closes: #760076.
.
[ Aurelien Jarno ]
* debian/control.in/main: Build-Depends on dpkg (>= 1.17.11) instead of
dpkg-dev (>= 1.17.1). Closes: #759495.
* debian/debhelper.in/libc.{preinst,postinst,postrm}: correctly remove old
conffiles /etc/ld.so.conf.d/i486-{kfreebsd-gnu.conf,gnu-gnu.conf,gnu.conf}.
Closes: #759568.
* Update Italian debconf translation, by Luca Monducci. Closes: #760092.
.
[ Petr Salinger ]
* kfreebsd/local-fbtl.diff: update to revision 5520 (from glibc-bsd).
Fixes x87 precision mode in newly created pthreads. Closes: #761175.
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