Clients seeing EPIPE, dbus-daemon 1.8.16, how to debug?

[Chris Morgan]

On Tuesday, June 2, 2015, Thiago Macieira <thiago at kde.org> wrote:

> On Tuesday 02 June 2015 19:48:23 Chris Morgan wrote:
> > Is there anything that the comes to mind that the clients might not be
> > handling in those particular cases? We looked into the gdbus code and
> > didn't see any retries etc but if it is a protocol issue I'm wondering
> > if its related to the high load and something not being handled in a
> > corner case of the protocol.
>
> The protocol does not support retries. This is all done on top of a
> reliable-
> delivery streaming connection (Unix SOCK_STREAM sockets), so there's no
> need
> to retry.
>
> There's *nothing* the daemon can do to cause an EPIPE, besides
> disconnecting
> the socket.
>
> So there are two possibilities only: either EPIPE was caused by the socket
> being disconnected or it was caused by the kernel. If it was caused by the
> kernel, it's important to know what exactly the payload of the sendmsg call
> was.
>
> Did the payload include file descriptors? I don't see how that could cause
> EPIPE, but...
>
> In fact, I don't see anything else that could cause EPIPE in the kernel
> source
> code.
> --
> Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
>    Software Architect - Intel Open Source Technology Center
>       PGP/GPG: 0x6EF45358; fingerprint:
>       E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358



I'll try to get back tomorrow sometime with the strace output, I'm in
U.S. EST time zone btw.

Chris
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