[pulseaudio-tickets] [Bug 104958] New: Crash when enabling echo cancellation and also specifying PULSE_PROP="filter.want=echo-cancel media.role=phone"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104958

            Bug ID: 104958
           Summary: Crash when enabling echo cancellation and also
                    specifying PULSE_PROP="filter.want=echo-cancel
                    media.role=phone"
           Product: PulseAudio
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: modules
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: rocketraman at gmail.com
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

Created attachment 137179
  --> https://bugs.freedesktop.org/attachment.cgi?id=137179&action=edit
gdb backtrace with symbols

I am able to consistently reproduce a SEGFAULT on 11.1 (RPM Fedora
pulseaudio-11.1-7.fc27.x86_64, with the two echo cancellation patches @
https://patchwork.freedesktop.org/patch/187359/ applied on top.

To do this, I run pulseaudio with the following in /etc/pulse/default.pa:

load-module module-echo-cancel use_master_format=1 aec_method=webrtc
aec_args="analog_gain_control=0 digital_gain_control=1 noise_suppression=1"
source_name=echoCancel_source sink_name=echoCancel_sink
set-default-source echoCancel_source
set-default-sink echoCancel_sink

and then I run Zoiper as follows:

PULSE_PROP="filter.want=echo-cancel media.role=phone" /opt/Zoiper/zoiper

This then causes a crash in pulseaudio:

Here are the last few lines of the log:

I: [pulseaudio] protocol-native.c: Final latency 50.00 ms = 12.50 ms + 2*12.50
ms + 12.50 ms
D: [alsa-sink-USB Audio] alsa-sink.c: Latency set to 12.50ms
D: [alsa-sink-USB Audio] alsa-sink.c: hwbuf_unused=381600
D: [alsa-sink-USB Audio] alsa-sink.c: setting avail_min=95701
D: [alsa-sink-USB Audio] module-echo-cancel.c: Sink input update max request
4800
D: [alsa-sink-USB Audio] alsa-sink.c: Requesting rewind due to latency change.
D: [alsa-sink-USB Audio] module-echo-cancel.c: Sink input update requested
latency 12500
D: [alsa-sink-USB Audio] alsa-sink.c: Requested to rewind 384000 bytes.
D: [alsa-sink-USB Audio] alsa-sink.c: Limited to 9344 bytes.
D: [alsa-sink-USB Audio] alsa-sink.c: before: 2336
D: [alsa-sink-USB Audio] alsa-sink.c: after: 2336
D: [alsa-sink-USB Audio] alsa-sink.c: Rewound 9344 bytes.
D: [alsa-sink-USB Audio] sink.c: Processing rewind...
D: [alsa-sink-USB Audio] sink-input.c: Have to rewind 9344 bytes on render
memblockq.
D: [alsa-sink-USB Audio] module-echo-cancel.c: Sink process rewind 0
D: [alsa-sink-USB Audio] sink-input.c: Have to rewind 9344 bytes on render
memblockq.
D: [alsa-sink-USB Audio] source.c: Processing rewind...
D: [alsa-source-USB Audio] module-echo-cancel.c: Sink rewind (0)

Thread 1 "pulseaudio" received signal SIGSEGV, Segmentation fault.
0x00007fffcbbf81c1 in find_paired_master (is_sink_input=true, o=0x5555559921a0,
filter=0x555555a55810, u=0x5555559c0040) at modules/module-filter-apply.c:204
204                             filter->source_master =
so->source->output_from_master->source;


And I have attached the complete backtrace with symbols from `thread apply all
bt full`.

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