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Giac miscompiles on non-x86_64 platforms #22280

Closed jpflori closed 7 years ago

jpflori commented 7 years ago

Executing 1+1 with giac-1.2.2.103 on ppc64le POWER8:

0>> 1+1;
[New Thread 0x3fff7443f180 (LWP 173710)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x3fff7443f180 (LWP 173710)]
0x00003fffb7b9e544 in giac::gen::in_eval (this=0x3fff7443e768, level=25, evaled=..., contextptr=0x3fffffffda40) at gen.cc:2109
2109              evaled=(*_SYMBptr->sommet.ptr())(evaled,contextptr);
(gdb) bt
#0  0x00003fffb7b9e544 in giac::gen::in_eval (this=0x3fff7443e768, level=25, evaled=..., contextptr=0x3fffffffda40) at gen.cc:2109
#1  0x00003fffb7b9bcdc in giac::gen::eval (this=0x3fff7443e768, level=25, contextptr=0x3fffffffda40) at gen.cc:1899
#2  0x00003fffb789e6ac in giac::protecteval (g=..., level=25, contextptr=0x3fffffffda40) at prog.cc:6881
#3  0x00003fffb767ff44 in giac::in_thread_eval (arg=0x100a9cd8) at global.cc:3463
#4  0x00003fffb5b18070 in start_thread () from /lib/powerpc64le-linux-gnu/libpthread.so.0
#5  0x00003fffb5763230 in clone () from /lib/powerpc64le-linux-gnu/libc.so.6
(gdb) list
2104              evaled=_SYMBptr->feuille;
2105            }
2106            if (is_ifte)
2107              evaled=ifte(evaled,true,contextptr);
2108            else
2109              evaled=(*_SYMBptr->sommet.ptr())(evaled,contextptr);
2110            elevel=slevel;
2111          }
2112          else
2113            evaled=_SYMBptr->eval(level,contextptr);

Upgrading to giac-1.2.3.25 (#22101) does not fix this problem.

Use > -45 version: The upstream tarball is at http://www-fourier.ujf-grenoble.fr/~parisse/debian/dists/stable/main/source/giac_1.2.3-47.tar.gz Repackaged tarball is at:

Depends on #22101

Upstream: Fixed upstream, in a later stable release.

CC: @rwst @frederichan-IMJPRG @vbraun

Component: packages: standard

Author: Jean-Pierre Flori

Branch: 8dc4c88

Reviewer: Thierry Monteil, Jean-Pierre Flori, François Bissey

Issue created by migration from https://trac.sagemath.org/ticket/22280

jpflori commented 7 years ago
comment:46

Replying to @sagetrac-tmonteil:

Did you suggest the fix for libpng/lpng1x too ([/22159#comment:29 suggested on this comment])?

Nope, I did not...

jpflori commented 7 years ago
comment:47

Replying to @kiwifb:

Which version is your starting point? I am trying with 1.2.3-25 at the moment (because I have it handy on ppc64 right now) and while it is an improvement there are still failures, and I seem to be hanging at chk_morley_demo and a few others.

Hum, the one pointed in this ticket.

The latest "unstable" (which might have become stable) tarball should have equivalent fixes. See:

I guess you still have to pass -Dx86_64 into C[XX|PP]FLAGS to make sure addresses are not cut at 32 bits.

jpflori commented 7 years ago
comment:48

Note that using static or shared libraries makes no difference, both work well.

jpflori commented 7 years ago
comment:49

Thanks to Bernard and debian folk work the latest stable version seems ok. Pass -Dx86_64 into CPPFLAGS.

jpflori commented 7 years ago

Description changed:

--- 
+++ 
@@ -32,5 +32,6 @@

 ---

-One can maybe cheat and pass  `-D__x86_64__ -DSMARTPTR64` in CPPFLAGS but that's dirty, see:
-* http://xcas.e.ujf-grenoble.fr/XCAS/viewtopic.php?f=19&t=1723
+Use > -45 version:
+* http://www-fourier.ujf-grenoble.fr/~parisse/debian/dists/stable/main/source/giac_1.2.3-47.tar.gz
+And pass `-Dx86_64` in CPPFLAGS.
7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 7 years ago

Changed commit from f5e35f2 to 8dc4c88

7ed8c4ca-6d56-4ae9-953a-41e42b4ed313 commented 7 years ago

Branch pushed to git repo; I updated commit sha1. New commits:

8dc4c88Update to 1.2.3-47.
jpflori commented 7 years ago

Description changed:

--- 
+++ 
@@ -33,5 +33,7 @@
 ---

 Use > -45 version:
-* http://www-fourier.ujf-grenoble.fr/~parisse/debian/dists/stable/main/source/giac_1.2.3-47.tar.gz
+The upstream tarball is at http://www-fourier.ujf-grenoble.fr/~parisse/debian/dists/stable/main/source/giac_1.2.3-47.tar.gz
+Repackaged tarball is at:
+* http://perso.telecom-paristech.fr/~flori/giac-1.2.3.47.tar.bz2
 And pass `-Dx86_64` in CPPFLAGS.
jpflori commented 7 years ago
comment:52

If you want to add arm64 support, please do so. But I think this is ready to go now.

jpflori commented 7 years ago
comment:53

Feel free to send this to the bots!

jpflori commented 7 years ago

Changed upstream from Reported upstream. No feedback yet. to Fixed upstream, in a later stable release.

kiwifb commented 7 years ago
comment:55

I am sorry I haven't had time to test this fully yet. I will try to give it another go over the weekend.

kiwifb commented 7 years ago
comment:56
make[3]: Entering directory '/dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/check'
*** stack smashing detected ***: /dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/icas terminated
======= Backtrace: =========
/shared/work_no_backup/ppc64-prefix/lib64/libc.so.6(+0xa3ba8)[0x400016e3ba8]
/shared/work_no_backup/ppc64-prefix/lib64/libc.so.6(__fortify_fail-0x89548)[0x40001782480]
/shared/work_no_backup/ppc64-prefix/lib64/libc.so.6(__stack_chk_fail-0x89598)[0x40001782418]
/dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0(_ZN4giac5substERKNS_3genERKNS_15dbgprint_vectorIS0_EES6_bPKNS_7contextE-0x836be0)[0x400007770d8]
/dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0(+0x6dbcc0)[0x4000074bcc0]
/dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0(+0x1ca518)[0x4000023a518]
/dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0(+0x6e0834)[0x40000750834]
/dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0(_ZN4giac5limitERKNS_3genERKNS_14identificateurES2_iPKNS_7contextE-0x85b8e8)[0x40000751590]
/dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0(_ZN4giac11quotedlimitERKNS_3genERKNS_14identificateurES2_iPKNS_7contextE-0x85b498)[0x400007519f8]
/dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0(_ZN4giac6_limitERKNS_3genEPKNS_7contextE-0x85ab14)[0x40000752394]
/dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0(_ZNK4giac19unary_function_evalclERKNS_3genEPKNS_7contextE-0x3aa814)[0x40000c165b4]
/dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0(_ZNK4giac18unary_function_ptrclERKNS_3genEPKNS_7contextE-0x3b940c)[0x40000c07c5c]
/dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0(_ZNK4giac8symbolic4evalEiPKNS_7contextE-0xa07dd8)[0x4000059f9b8]
/dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0(_ZNK4giac3gen7in_evalEiRS0_PKNS_7contextE-0x2c80d0)[0x40000cfdc30]
/dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0(_ZNK4giac3gen4evalEiPKNS_7contextE-0x2c70d8)[0x40000cfec58]
/dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0(_ZN4giac11protectevalERKNS_3genEiPKNS_7contextE-0x54a214)[0x40000a6fe34]
/dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0(+0x81b894)[0x4000088b894]
/shared/work_no_backup/ppc64-prefix/lib64/libpthread.so.0(+0xbb10)[0x40002c1bb10]
/shared/work_no_backup/ppc64-prefix/lib64/libc.so.6(clone-0x9e5b8)[0x4000176b268]
======= Memory map: ========
10000000-10020000 r-xp 00000000 00:10 13112212                           /dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/icas
10020000-10030000 r--p 00010000 00:10 13112212                           /dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/icas
10030000-10040000 rw-p 00020000 00:10 13112212                           /dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/icas
10040000-100d0000 rw-p 00000000 00:00 0                                  [heap]
40000000000-40000030000 r-xp 00000000 00:16 41936355                     /shared/work_no_backup/ppc64-prefix/lib64/ld-2.23.so
40000030000-40000040000 r--p 00020000 00:16 41936355                     /shared/work_no_backup/ppc64-prefix/lib64/ld-2.23.so
40000040000-40000050000 rw-p 00030000 00:16 41936355                     /shared/work_no_backup/ppc64-prefix/lib64/ld-2.23.so
40000050000-40000070000 r-xp 00000000 00:00 0                            [vdso]
40000070000-40000f60000 r-xp 00000000 00:10 13111890                     /dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0.0.0
40000f60000-40000f70000 ---p 00ef0000 00:10 13111890                     /dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0.0.0
40000f70000-40000fd0000 r--p 00ef0000 00:10 13111890                     /dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0.0.0
40000fd0000-40000ff0000 rw-p 00f50000 00:10 13111890                     /dev/shm/portage/sci-mathematics/giac-1.2.3.47/work/giac-1.2.3/src/.libs/libgiac.so.0.0.0
40000ff0000-40001020000 rw-p 00000000 00:00 0 
40001020000-40001080000 r-xp 00000000 00:16 14674565                     /shared/work_no_backup/ppc64-prefix/usr/lib64/libreadline.so.7.0
40001080000-40001090000 r--p 00050000 00:16 14674565                     /shared/work_no_backup/ppc64-prefix/usr/lib64/libreadline.so.7.0
40001090000-400010a0000 rw-p 00060000 00:16 14674565                     /shared/work_no_backup/ppc64-prefix/usr/lib64/libreadline.so.7.0
400010a0000-40001340000 r-xp 00000000 00:16 16553231                     /shared/work_no_backup/ppc64-prefix/usr/lib64/libgsl.so.19.3.0
40001340000-40001370000 r--p 00290000 00:16 16553231                     /shared/work_no_backup/ppc64-prefix/usr/lib64/libgsl.so.19.3.0
40001370000-40001390000 rw-p 002c0000 00:16 16553231                     /shared/work_no_backup/ppc64-prefix/usr/lib64/libgsl.so.19.3.0
40001390000-400013a0000 rw-p 00000000 00:00 0 
400013b0000-400015c0000 r-xp 00000000 00:16 15211125                     /shared/work_no_backup/ppc64-prefix/usr/lib64/gcc/powerpc64-unknown-linux-gnu/5.4.0/libstdc++.so.6.0.21
400015c0000-400015f0000 r--p 00200000 00:16 15211125                     /shared/work_no_backup/ppc64-prefix/usr/lib64/gcc/powerpc64-unknown-linux-gnu/5.4.0/libstdc++.so.6.0.21
400015f0000-40001600000 rw-p 00230000 00:16 15211125                     /shared/work_no_backup/ppc64-prefix/usr/lib64/gcc/powerpc64-unknown-linux-gnu/5.4.0/libstdc++.so.6.0.21
40001600000-40001620000 r-xp 00000000 00:16 15211117                     /shared/work_no_backup/ppc64-prefix/usr/lib64/gcc/powerpc64-unknown-linux-gnu/5.4.0/libgcc_s.so.1
40001620000-40001630000 r--p 00010000 00:16 15211117                     /shared/work_no_backup/ppc64-prefix/usr/lib64/gcc/powerpc64-unknown-linux-gnu/5.4.0/libgcc_s.so.1
40001630000-40001640000 rw-p 00020000 00:16 15211117                     /shared/work_no_backup/ppc64-prefix/usr/lib64/gcc/powerpc64-unknown-linux-gnu/5.4.0/libgcc_s.so.1FAIL: chk_limit
PASS: chk_partfrac
FAIL: chk_fhan15
PASS: chk_fhan13
PASS: chk_factor
PASS: chk_geo
FAIL: chk_fhan0
PASS: chk_fhan21
PASS: chk_integrate
FAIL: chk_fhan2
FAIL: chk_cas
PASS: chk_xavier
FAIL: chk_fhan1
PASS: chk_normalize
FAIL: chk_morley_demo
FAIL: chk_fhan18
FAIL: chk_fhan12
FAIL: chk_fhan7
FAIL: chk_fhan20
FAIL: chk_fhan16
FAIL: chk_fhan9
FAIL: chk_fhan17
FAIL: chk_fhan8
FAIL: chk_fhan5
FAIL: chk_fhan3
FAIL: chk_fhan4
FAIL: chk_fhan6
FAIL: chk_fhan19
FAIL: chk_fhan14
FAIL: chk_fhan11
============================================================================
Testsuite summary for giac 1.2.3
============================================================================
# TOTAL: 30
# PASS:  8
# SKIP:  0
# XFAIL: 0
# FAIL:  22
# XPASS: 0
# ERROR: 0

I am starting to think my g++ is at fault :(

kiwifb commented 7 years ago
comment:57

@ Jean-Pierre, what version of gcc did you test this with?

jpflori commented 7 years ago
comment:58

An old one:

gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/ppc64-redhat-linux/4.8.3/lto-wrapper
Target: ppc64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin --enable-initfini-array --enable-java-awt=gtk --disable-dssi --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre --enable-libgcj-multifile --enable-java-maintainer-mode --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib --with-isl=/builddir/build/BUILD/gcc-4.8.3-20140911/obj-ppc64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.8.3-20140911/obj-ppc64-redhat-linux/cloog-install --enable-secureplt --with-long-double-128 --build=ppc64-redhat-linux
Thread model: posix
gcc version 4.8.3 20140911 (Red Hat 4.8.3-7) (GCC)

I did not run giac testsuite though.

kiwifb commented 7 years ago
comment:59

Replying to @jpflori:

An old one:

gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/ppc64-redhat-linux/4.8.3/lto-wrapper
Target: ppc64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin --enable-initfini-array --enable-java-awt=gtk --disable-dssi --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre --enable-libgcj-multifile --enable-java-maintainer-mode --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib --with-isl=/builddir/build/BUILD/gcc-4.8.3-20140911/obj-ppc64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.8.3-20140911/obj-ppc64-redhat-linux/cloog-install --enable-secureplt --with-long-double-128 --build=ppc64-redhat-linux
Thread model: posix
gcc version 4.8.3 20140911 (Red Hat 4.8.3-7) (GCC)

I did not run giac testsuite though.

Ah, I never had trouble building it. Just running/testing it. It will be some work to get things to build with gcc 4.8.x, will have to find all the C++ dependencies before building.

jpflori commented 7 years ago
comment:60

Most tests seem to pass on my machine except for some numerical noise and some very long or looping tests I killed.

edd8e884-f507-429a-b577-5d554626c0fe commented 7 years ago
comment:61

Replying to @jpflori:

Replying to @sagetrac-tmonteil:

Did you suggest the fix for libpng/lpng1x too ([/22159#comment:29 suggested on this comment])?

Nope, I did not...

Could you please give me some hints on how to achieve this (which file to modify, and how) ?

(sorry for not being able to help on the review, i do not have any ppc machine, my intel 32bit VM is trying it right now, just in case)

jpflori commented 7 years ago
comment:62

Just patch the Makefile to use -lpng16 rather than -lpng.

kiwifb commented 7 years ago
comment:63

Currently giac configure png with

CONFIG_PNG="yes"
AC_ARG_ENABLE(png,
        [AS_HELP_STRING([--enable-png], [Enable PNG library])],
        [ if test "x$enableval" = "xno"; then CONFIG_PNG="no"; fi], [])

if test "x$CONFIG_PNG" = "xyes"; then
   AC_CHECK_HEADERS(png.h, AC_CHECK_LIB(png,main))
fi

in configure.in. An option is to use AC_CHECK_LIBS(main,[png16,png14,png12,png]) instead of AC_CHECK_LIB. For Jean-Pierre suggestion you have to do the replacement after configure is run. Because AC_CHECK_LIB is used -lpng is added to LIBS by configure.

edd8e884-f507-429a-b577-5d554626c0fe commented 7 years ago
comment:64

Replying to @sagetrac-tmonteil:

(sorry for not being able to help on the review, i do not have any ppc machine, my intel 32bit VM is trying it right now, just in case)

For what it worth, giac-1.2.3.47 from this ticket compiles and pass self-tests on both my 64bit laptop and 32bit VM (both running Debian GNU/Linux jessie).

edd8e884-f507-429a-b577-5d554626c0fe commented 7 years ago
comment:65

Ragarding building giac with png support, thanks Jean-Pierre and François for your hints, i opened #23262.

kiwifb commented 7 years ago
comment:66

Unfortunately, I still have no luck on ppc64 with gcc-5.4.0. It is better than before in that some tests are now succeeding. But things seems to get stuck in a C++ allocator for a number of them.

jpflori commented 7 years ago
comment:67

Is giac itself functional? That is: is it only failing its testsuite or is it completely broken as well?

kiwifb commented 7 years ago
comment:68

Fair question. "1+1" works, the fact that some tests work means that it is working up to a point. I haven't tried to run the sage testsuite with it. Any tests I should run?

jpflori commented 7 years ago
comment:69

Maybe sage -t src/sage/interfaces/giac.py and rings and symbolic would tell you if it looks functional or not.

On my side, giac also fails a lot of its own testsuite, inlcuding bunch of numerical noise, but also more worrying stuff i did not investigate, but running tests as above seems to indicate it is good enough for sage.

kiwifb commented 7 years ago
comment:70

OK, I did run those tests and the few failures I have are unrelated to giac (I'll have to investigate some of them more deeply but they are definitely not giac). I guess we can go ahead with this.

kiwifb commented 7 years ago

Reviewer: Thierry Monteil, Jean-Pierre Flori, François Bissey

vbraun commented 7 years ago

Changed branch from public/giac to 8dc4c88

c4796b8b-df47-4c78-a415-d934347608f6 commented 7 years ago

Changed commit from 8dc4c88 to none

c4796b8b-df47-4c78-a415-d934347608f6 commented 7 years ago
comment:72

Do you guys know why the -Dx86_64 is needed on ppc64? That is still a bug that should be fixed upstream. In theory upstream should now be detecting 64-bit in a cross-platform way so I'm confused why it fails on ppc64.

c4796b8b-df47-4c78-a415-d934347608f6 commented 7 years ago
comment:73

(sorry, I have no idea why my comment there deleted the commit field)

(I can't seem to fix it either, even by Modifying the ticket with that commit)

c4796b8b-df47-4c78-a415-d934347608f6 commented 7 years ago
comment:74

All tests pass for me for 1.2.3-51 on arm64 on Debian without further changes or extra flags, btw.

kiwifb commented 7 years ago
comment:75

I'll have to try 1.2.3-51 on ppc64 without extra flags then. 1.2.3-47 builds but a lot of tests fail for me. We may want to consider a further upgrade.

The removal of the commit when you comment further is a "feature" of track. It is annoying but not harmfull.

kiwifb commented 7 years ago
comment:76

Well, you probably don't have that problem but I allow compilation without gui, and sage itself doesn't depend on fltk

  bool has_graph3d(Fl_Widget * widget){
#ifdef HAVE_LIBFLTK
    Fl_Group * g=dynamic_cast<Fl_Group *>(widget);

Oooops! in src/Xcas.cc (line 3360) there goes your compilation failure if you don't have fltk.

c4796b8b-df47-4c78-a415-d934347608f6 commented 7 years ago
comment:77

I have found that annoying too, in Debian I am forced to ship the non-GUI icas program (which is what Sage actually wants) together with the GUI xcas program, and it even links against X libraries. I've filed a bug about it upstream, hopefully they can fix it.

kiwifb commented 7 years ago
comment:78

Well, I pilled up some more in http://xcas.e.ujf-grenoble.fr/XCAS/viewtopic.php?f=4&t=1814 because your request, I felt, was much broader than mine (but yes something should be done about all that X stuff).

c4796b8b-df47-4c78-a415-d934347608f6 commented 7 years ago
comment:79

Unfortunately giac fails to compile for me on a arm64 (aarch64) 4.9 Linux kernel:

http://xcas.e.ujf-grenoble.fr/XCAS/viewtopic.php?p=8941#p8941

It succeeded on a 3.16 Linux kernel though, as I reported above. Could someone reproduce this and if so re-open this ticket or open another one?

c4796b8b-df47-4c78-a415-d934347608f6 commented 7 years ago
comment:80

A potential solution to this has been suggested on the Debian bug tracker: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=855078#29

I'll try to test it next week, in the meantime feel free to jump in ahead.