Package: wvdial
Version: 1.61-4.1
Severity: important

Dear Maintainer,

1. 11-03-2018
After the command: apt-get upgrade
I've updated the following packages:
  base-files bsdutils cron cups cups-client cups-common cups-core-drivers
  cups-daemon cups-ppdc cups-server-common dbus dbus-user-session dbus-x11
  fonts-opensymbol gir1.2-javascriptcoregtk-4.0 gir1.2-webkit2-4.0
  grilo-plugins-0.3 isc-dhcp-client isc-dhcp-common libapparmor1 libblkid1
  libc-bin libc-dev-bin libc-l10n libc6 libc6-dev libcups2 libcupscgi1
  libcupsimage2 libcupsmime1 libcupsppdc1 libdbus-1-3 libfdisk1
  libjavascriptcoregtk-4.0-18 libmount1 libncurses5 libncursesw5
  libnss-myhostname libpam-systemd libreoffice-avmedia-backend-gstreamer
  libreoffice-base-core libreoffice-calc libreoffice-common libreoffice-core   libreoffice-draw libreoffice-gnome libreoffice-gtk3 libreoffice-help-en-gb
  libreoffice-help-pl libreoffice-impress libreoffice-l10n-en-gb
  libreoffice-l10n-pl libreoffice-math libreoffice-style-galaxy
  libreoffice-style-tango libreoffice-writer libsmartcols1 libsoundtouch1
  libsystemd0 libtinfo5 libudev1 libuuid1 libvpx4 libwebkit2gtk-4.0-37 locales   mount multiarch-support ncurses-base ncurses-bin ncurses-term openssh-client
  python3-uno systemd systemd-sysv udev uno-libs3 ure util-linux
  util-linux-locales uuid-runtime

2.Then I launched WVDIAL
................
root@debian:/home/mydebi# wvdial
--> WvDial: Internet dialer version 1.61
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: AT+CGDCONT=1,"IP","xxxxxxxxx"
AT+CGDCONT=1,"IP","xxxxxxxxx"
OK
--> Modem initialized.
--> Sending: ATD*99#
--> Waiting for carrier.
ATD*99#
CONNECT 100000000
--> Carrier detected.  Starting PPP immediately.
--> Starting pppd at Mon Mar 11 18:03:04 2018
--> Pid of pppd: 1616
wvdial: utils/wvtask.cc:303: static int WvTaskMan::yield(int): Assertion `*current_task->stack_magic == WVTASK_MAGIC' failed.
Aborted
................
The connection has been established, the internet works but this nasty message :(

3.The dependency analysis indicated that the above two files: libc6 and libc6-dev appear as dependencies in libwvstreams4.6-base (my version is: 4.6.1-11). I decided to check it out. I restored the previous version (with the Timeshift program) and then (in Synaptic) I only updated these files:
...................
libc-dev-bin (2.24-11+deb9u1) to 2.24-11+deb9u3
libc6 (2.24-11+deb9u1) to 2.24-11+deb9u3
libc6-dev (2.24-11+deb9u1) to 2.24-11+deb9u3
...................
After starting WVDIAL, this nasty message has appeared again:
..............
wvdial: utils/wvtask.cc:303: static int WvTaskMan::yield(int): Assertion `*current_task->stack_magic == WVTASK_MAGIC' failed.
Aborted
.............

4.The next day I downloaded the newest version of DEBIAN 9.4.0 LIVE. And exactly the same message as above

5.I've tried two different USB modems

6. !!! CONCLUSION !!!. The problem (error) is probably in the updated files: libc-dev-bin, libc6 or libc6-dev or in the absence of actualization the libwvstreams4.6-base file (my version is: 4.6.1-11)

Debian_version 9.3
Linux debian 4.9.0-6-amd64 #1 SMP Debian 4.9.82-1+deb9u3 (2018-03-02) x86_64 GNU/Linux

Versions of packages libwvstreams4.6-base (ver. 4.6.1-11) depends:
libwvstreams4.6-extras ver. 4.6.1-11
libc6 ver. 2.24-11+deb9u3 (problem) 2.24-11+deb9u1 (no problem)
libgcc1 ver. 1:6.3.0-18+deb9u1
libstdc++6 ver.6.3.0-18+deb9u1
zlib1g ver.1:1.2.8.dfsg-5

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