qgis-providers: postinst failure: free(): invalid pointer

[sebastic]

As reported by Laurent Bonnaud in Debian Bug #954242:

here is the problem:

Setting up qgis-providers (3.10.3+dfsg-1+b1) ...
free(): invalid pointer
Aborted (core dumped)
dpkg: error processing package qgis-providers (--configure):
 installed qgis-providers package post-installation script subprocess returned error exit status 134

Note that my system has glibc 2.31 from experimental and the following environment variables are set:

MALLOC_PERTURB_=117
MALLOC_CHECK_=3

Running "valgrind /usr/lib/qgis/crssync" finds many memory errors, and the first one is:

==34194== Invalid free() / delete / delete[] / realloc()
==34194==    at 0x4838EAB: operator delete(void*) (vg_replace_malloc.c:586)
==34194==    by 0x76643D5: __cxa_finalize (cxa_finalize.c:83)
==34194==    by 0xEC8FF62: ??? (in /usr/lib/x86_64-linux-gnu/libproj.so.15.3.1)
==34194==    by 0x400FF92: _dl_fini (dl-fini.c:138)
==34194==    by 0x7663DD6: __run_exit_handlers (exit.c:108)
==34194==    by 0x7663F89: exit (exit.c:139)
==34194==    by 0x764CCF1: (below main) (libc-start.c:342)
==34194==  Address 0x1796f740 is 0 bytes inside a block of size 17 free'd
==34194==    at 0x4838EAB: operator delete(void*) (vg_replace_malloc.c:586)
==34194==    by 0x76643D5: __cxa_finalize (cxa_finalize.c:83)
==34194==    by 0x7B12702: ??? (in /usr/lib/x86_64-linux-gnu/libproj.so.19.0.0)
==34194==    by 0x400FF92: _dl_fini (dl-fini.c:138)
==34194==    by 0x7663DD6: __run_exit_handlers (exit.c:108)
==34194==    by 0x7663F89: exit (exit.c:139) 
==34194==    by 0x764CCF1: (below main) (libc-start.c:342)
==34194==  Block was alloc'd at
==34194==    at 0x4837DEF: operator new(unsigned long) (vg_replace_malloc.c:344)
==34194==    by 0x7B0E91F: ??? (in /usr/lib/x86_64-linux-gnu/libproj.so.19.0.0)
==34194==    by 0x7B11A2C: ??? (in /usr/lib/x86_64-linux-gnu/libproj.so.19.0.0)
==34194==    by 0x400FC09: call_init.part.0 (dl-init.c:72)
==34194==    by 0x400FD08: call_init (dl-init.c:30)
==34194==    by 0x400FD08: _dl_init (dl-init.c:119)
==34194==    by 0x40010C9: ??? (in /usr/lib/x86_64-linux-gnu/ld-2.31.so)

-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 5.4.0-4-rt-amd64 (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages qgis-providers depends on:
ii  dpkg                              1.20.0
ii  libc6                             2.31-0experimental0
ii  libexpat1                         2.2.9-1
ii  libgcc-s1                         10-20200312-2
ii  libgdal26                         3.0.4+dfsg-1+b1
ii  libhdf5-103                       1.10.4+repack-11
ii  libnetcdf15                       1:4.7.3-1
ii  libpq5                            12.2-1+b1
ii  libqca-qt5-2                      2.2.1-2
ii  libqca-qt5-2-plugins              2.2.1-2
ii  libqgis-core3.10.3                3.10.3+dfsg-1+b1
ii  libqgis-gui3.10.3                 3.10.3+dfsg-1+b1
ii  libqscintilla2-qt5-15             2.11.2+dfsg-6
ii  libqt5core5a [qtbase-abi-5-12-5]  5.12.5+dfsg-9
ii  libqt5gui5                        5.12.5+dfsg-9
ii  libqt5network5                    5.12.5+dfsg-9
ii  libqt5sql5                        5.12.5+dfsg-9
ii  libqt5sql5-sqlite                 5.12.5+dfsg-9
ii  libqt5webkit5                     5.212.0~alpha4-1
ii  libqt5widgets5                    5.12.5+dfsg-9
ii  libqt5xml5                        5.12.5+dfsg-9
ii  libspatialite7                    5.0.0~beta0-1~exp4
ii  libsqlite3-0                      3.31.1-4
ii  libstdc++6                        10-20200312-2
ii  libxml2                           2.9.10+dfsg-4
ii  qgis-providers-common             3.10.3+dfsg-1

qgis-providers recommends no packages.

qgis-providers suggests no packages.

-- no debconf information

[stev-0]

A similar issue (when building, not package related) was caused by linking with Proj 7 on my machine - 6.3 x worked fine. So this looks like a system issue on that individual system. Obviously this will need to be fixed at some point though. Plus the memory leak issues - validated those and got a similar output but don't understand enough to comment.

[sebastic]

The memory leak issues are the most important thing to fix for the issue.

[adisrivasa]

The bug seems to be in qgis, rather than the system. I am also facing the same issue. It has now blocked all possible updates on my system also.

[nyalldawson]

I can't reproduce - on my build using a self-built proj 7 and gdal master direct from upstream I get no issues reported by valgrind/asan.

My gut feeling is that this isn't a qgis issue.

[rouault]

The Valgrind stack trace shows that QGIS and/or one of its dependent libraries is linking against 2 different versions of PROJ:

/usr/lib/x86_64-linux-gnu/libproj.so.15.3.1
/usr/lib/x86_64-linux-gnu/libproj.so.19.0.0

This is the cause of the crash

[nyalldawson]

Closing as a downstream bug

[oe2lsp]

can't install qgis on ubuntu 20.04 due to this problem