It was reported in IRC that while memfd works with 64-bit clients, 32-bit clients get disconnected during the connection setup phase. Disabling memfd makes things work. The last log messages at the client side are:
Negotiated SHM type: shared memfd
Connection failure: Connection terminated
The last log messages at the server side are:
D: [pulseaudio] protocol-native.c: Enabling srbchannel...
I: [pulseaudio] client.c: Freed 1 "Native client (UNIX socket client)"
I: [pulseaudio] protocol-native.c: Connection died.
So neither party complains about a protocol error, the connection seems to somehow die spontaneously.
Marking as a 10.0 blocker.
Just a quick follow up on this (I was the one who mentioned this on irc).
Original report was using arch, but i can confirm the issue is also present with ubuntu 16.10beta packages on a liveusb i had at hand. Logs for server and client show nothing new.
So looks like a proper bug.
Interesting; will install a 32-bit userland and trace up things.
This seems to be a bug in pulse iochannel layer + a subtle bug in the kernel's 32-bit socket emulation layer. Please check the fix I've just posted below, which fixes the issue on my side:
Thanks a lot for submitting this critical bug report :-)
Works for me using custom PA 9.0 arch pkgs with your patch applied, thanks for the fix.
If I understand correctly, the current solution requires the fix to be applied in the 32-bit client libs (libpulsecommon)? If that's true, this could be a small problem for the 10.0 memfd default: Default 9.0 seems to compile memfd and use it client-side (unless explicitly disabled in client.conf) when the server requests it (which the 10.0 server will do by default).
Ideally, this shouldn't be a problem as the client can be updated to 10.0 like the server, but bundling/snapshotting/embedding libs obviously happens in practice (e.g. steam, games). As of right now, this is mostly a theoretical issue because the legacy 32-bit clients I'm aware of use <9.0 anyway and therefore don't have memfd at all. But until a fixed 9.1 or 10.0 is released, faulty 9.0 clients have time to get adopted in such bundles.
That is, if I got this right, it's a little confusing and I might have missed something. :-)
Glad that the patch works ;-)
Regarding the possibility of this bug biting people in the future if they bundle 9.0 libraries and work against a 10.0/11.0/+ server, that's a very good point.
Instead of releasing a 9.1 though (which might or might not be bundled after all), I'm thinking of adding special code to 10.0 server side: refuse declaring server's memfd support if the client version is < 10.0.
Tanu, what do you think about this?
Thanks a lot for the patch! I applied it now:
(In reply to Ahmed S. Darwish from comment #6)
> Instead of releasing a 9.1 though (which might or might not be bundled after
> all), I'm thinking of adding special code to 10.0 server side: refuse
> declaring server's memfd support if the client version is < 10.0.
> Tanu, what do you think about this?
Adding a version check would probably be trivial. Would you be willing to make a patch?
On Thu, Nov 17, 2016 at 05:48:25PM +0000, email@example.com wrote:
> --- Comment #8 from Tanu Kaskinen <firstname.lastname@example.org> ---
> (In reply to Ahmed S. Darwish from comment #6)
> > Instead of releasing a 9.1 though (which might or might not be bundled after
> > all), I'm thinking of adding special code to 10.0 server side: refuse
> > declaring server's memfd support if the client version is < 10.0.
> > Tanu, what do you think about this?
> Adding a version check would probably be trivial. Would you be willing to make
> a patch?
Yeah, expect the patch by tomorrow. It would be important to
include that before a 10.0 release.
Server modified not to signal memfd support for the buggy 9.0 clients. Patch here:
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