Re: [alsa-devel] 1.1.4 bug report: dmix fails when using both 32-bit and 64-bit clients

On Wed, 24 May 2017 21:13:46 +0200, Cheng Sun wrote:

Hi all,

The following commit (released in v1.1.4) introduced an issue where a client compiled against a 32-bit (x86) compile of alsa-lib cannot use the same dmix as a client compiled against a 64-bit alsa-lib.

1a9bd0f0448106b917ae7f7bedccfcbf6ce84802

The error message is:

ALSA lib pcm_dmix.c:1077:(snd_pcm_dmix_open) unable to create IPC

shm instance

The following forum post (not mine) describes the symptoms of the issue in more detail (although the git commit the poster specified is not correct):

https://forums.gentoo.org/viewtopic-p-8072290.html?sid=c2fbca45102933ddf9ca7...

There is a known problem when you mix up two alsa-lib versions because of the changes in dmix shmem struct. The solution should upgrade all users.

Takashi