pulseaudio crashes with E: sink.c: Assertion 'PA_SINK_INPUT_IS_LINKED(st)' failed at pulsecore/sink.c:1748, function pa_sink_check_suspend(). Aborting.

[Philip Peitsch]

Binary package hint: pulseaudio

I am trying to run my 5.1 surround card as two independent stereo channels. In previous versions of Ubuntu (9.10 this still worked), I have done this by adding the following commands to my /etc/pulse/default.pa file. It appears to no longer work, allowing me to add the first remap, but always crashing after the second remap saying:

E: sink.c: Assertion 'PA_SINK_INPUT_IS_LINKED(st)' failed at pulsecore/sink.c:1748, function pa_sink_check_suspend(). Aborting.

The relevant part of config is:
load-module module-remap-sink sink_name=headphones master=alsa_output.pci-0000_00_1b.0.analog-surround-51 channels=2 master_channel_map=front-left,front-right channel_map=front-left,front-right remix=no
update-sink-proplist headphones device.description=Headphones
load-module module-remap-sink sink_name=external_speakers master=alsa_output.pci-0000_00_1b.0.analog-surround-51 channels=2 master_channel_map=rear-left,rear-right channel_map=front-left,front-right remix=no
update-sink-proplist external_speakers device.description=Speakers

I can add one of these lines (either one), but adding the second will crash. I've attached my default.pa file and the logfile produced by attempting to start the pulseaudio service with -Cvvvv

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: pulseaudio 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu14
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: insanity 6886 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfc100000 irq 22'
   Mixer name : 'Realtek ALC888'
   Components : 'HDA:10ec0888,1458e601,00100001'
   Controls : 40
   Simple ctrls : 22
CheckboxSubmission: 627843f773788cb8684bdb11b1715f9c
CheckboxSystem: 9038dc5b445882e24b06ebe5cf05c9fc
Date: Thu Apr 22 23:09:24 2010
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: pulseaudio
dmi.bios.date: 07/17/2007
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F12
dmi.board.name: 965P-S3
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF12:bd07/17/2007:svnGigabyteTechnologyCo.,Ltd.:pn965P-S3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rn965P-S3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: 965P-S3
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
mtime.conffile..etc.pulse.default.pa: 2010-04-22T23:01:04.655970

[Oliver Muth (dr-o-muth)]

Same problem here.
However, loading those modules manually using pacmd works fine.
Like:
pacmd load-module module-remap-sink sink_name=headphones master=alsa_output.pci-0000_00_1b.0.analog-surround-51 channels=2 master_channel_map=front-left,front-right channel_map=front-left,front-right remix=no
update-sink-proplist headphones device.description=Headphones

[dino99 (9d9)]

That version is no more supported