[pkg-tasktools] Bug#907603: taskwarrior: Task sync fails with "Aborted"

[Charlie Hagedorn]

Package: taskwarrior
Version: 2.5.1+dfsg-6
Severity: important

Dear Maintainer,

   * What led up to the situation?

A long-functioning taskwarrior installation fails to sync and crashes, perhaps 
after a recent update.

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

Ran 'task sync'. Running 'task list' works as usual.

   * What was the outcome of this action?

$ task sync
Aborted
$

Or, with debugging output turned on: 

$ task rc.debug=1 rc.debug.tls=3 sync
c: INFO Server certificate will be verified but hostname ignored.
c: 3 ASSERT: extensions.c[_gnutls_get_extension]:65
c: 3 ASSERT: extensions.c[_gnutls_get_extension]:65
c: 3 ASSERT: mpi.c[_gnutls_x509_read_uint]:246
c: 3 ASSERT: extensions.c[_gnutls_get_extension]:65
c: 3 ASSERT: extensions.c[_gnutls_get_extension]:65
c: 3 ASSERT: x509_ext.c[gnutls_subject_alt_names_get]:110
c: 3 ASSERT: x509.c[get_alt_name]:1701
c: 3 ASSERT: extensions.c[_gnutls_get_extension]:65
c: 3 ASSERT: constate.c[_gnutls_epoch_get]:600
c: 3 ASSERT: system/threads.c[gnutls_system_mutex_lock]:120
Aborted
$


   * What outcome did you expect instead?

Proper syncing with the taskserver, as usual.  The taskserver (inthe.am) is 
fine,
as my Debian jessie box and Android clients sync correctly.

As part of debugging this anomaly, I have tried cloning and compiling 
taskwarrior
from the upstream source, using Debian's libgnutls, with the same error. 

Thank you for your time! Taskwarrior makes my life better :)!

Charlie


-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (200, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.17.0-3-amd64 (SMP w/4 CPU cores)
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 /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages taskwarrior depends on:
ii  libc6        2.27-5
ii  libgcc1      1:8.2.0-4
ii  libgnutls30  3.5.19-1
ii  libstdc++6   8.2.0-4
ii  libuuid1     2.32.1-0.1

taskwarrior recommends no packages.

taskwarrior suggests no packages.

-- no debconf information