Bug#845662: libqt5core5a: Segfault in QObject::disconnect

["George B." <i93.borg@gmail.com>]

Package: libqt5core5a
Version: 5.7.1~20161021+dfsg-6
Severity: important

Hello,

I get a Qt5 related segfault when exiting any of the application provided by the
`calibre` package. Please re-assign to correct package if appropriate.

In the syslog I see:

```
Nov 25 17:52:21 glossy kernel: [21774.794341] QDBusConnection[20621]: segfault at 7f3f543dd220 ip 00007f3fac31eb8f sp 00007f3f57ffcb90 error 4 in libQt5Core.so.5.7.1[7f3fac065000+4cd000]
```

Backtrace (could not find any useful `-dbgsym` packages to install):

```
Core was generated by `/usr/bin/python2.7 /usr/bin/calibre'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fbdc428ab8f in QObject::disconnect(QObject const*, char const*, QObject const*, char const*)
    () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
[Current thread is 1 (Thread 0x7fbdaffff700 (LWP 17144))]
(gdb) bt full
#0  0x00007fbdc428ab8f in QObject::disconnect(QObject const*, char const*, QObject const*, char const*)
    () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#1  0x00007fbdc0ffed50 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
No symbol table info available.
#2  0x00007fbdc0feb7e2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
No symbol table info available.
#3  0x00007fbdc407fd88 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#4  0x00007fbdce713464 in start_thread (arg=0x7fbdaffff700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7fbdaffff700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140452678334208, -5589713675346736358, 0, 
                140721743300143, 0, 140453193498688, 5554634856892238618, 5554844778963307290}, 
              mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, 
              cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#5  0x00007fbdcdb319df in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105
No locals.
```


Best regards,

George

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

Kernel: Linux 4.8.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libqt5core5a depends on:
ii  libc6         2.24-6
ii  libgcc1       1:6.2.1-5
ii  libglib2.0-0  2.50.2-2
ii  libicu57      57.1-4
ii  libpcre16-3   2:8.39-2
ii  libstdc++6    6.2.1-5
ii  zlib1g        1:1.2.8.dfsg-2+b3

Versions of packages libqt5core5a recommends:
ii  qttranslations5-l10n  5.7.1~20161021-1

Versions of packages libqt5core5a suggests:
ii  libthai0  0.1.25-2

-- no debconf information