Bug#857947: gsequencer: possible data-race as clearing buffer of soundcard

[Joël Krähemann]

Source: gsequencer
Version: 0.7.122-2
Severity: important

Dear Maintainer,

The soundcard output is affected by a data-race. While clearing the output buffer, a data
race is possible. Resulting in corrupted audio export or playback. The possibility of
an application crash exists.
The clearing of the buffer should occur as a task. In order to run asynchronous exclusively.

-- System Information:
Debian Release: 9.0
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-1-rt-amd64 (SMP w/24 CPU cores; PREEMPT)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to C.UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)