[PATCH 2/2] cobalt: switch hand over status to -ENODEV for non-RTDM fd

Lange Norbert norbert.lange at andritz.com
Fri Aug 30 11:58:46 CEST 2019



> -----Original Message-----
> From: Jan Kiszka <jan.kiszka at siemens.com>
> Sent: Donnerstag, 29. August 2019 16:52
> To: Lange Norbert <norbert.lange at andritz.com>; Philippe Gerum
> <rpm at xenomai.org>; Xenomai (xenomai at xenomai.org)
> <xenomai at xenomai.org>
> Subject: Re: [PATCH 2/2] cobalt: switch hand over status to -ENODEV for non-
> RTDM fd
>
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> On 29.08.19 16:12, Lange Norbert via Xenomai wrote:
> >
> > I ran into a rather big issue with linux filehandles I use Xenomai
> > master on ipipe-core-4.19.60-x86-5 with those patches, (can't be 100%
> > sure its not some kernel/userspace conflict, but I doubt it)
> >
> > What happens is that upon a __cobalt_close with a linux filehande, the
> > syscall sc_cobalt_close returns EBADF, but that means the libc close
> > will never be tried and filehandles are leaking like mad.
> >
>
> Ah, good catch. Looks like Philippe's patch was missing a change to
> rtdm_fd_close().

Yes, but his v3 works.

> Thanks a lot for testing pro-actively!

You are welcome, its less benign than you might think though,
Philippe's patches (allow for device teardown) were requested from myself.

How does Xenomai/cobalt handle kernel/userspace conflicts like these BTW,
Is there some ABI variable that needs to be incremented and can detect mismatches?
(if you use an old libcobalt on a new kernel module with patchset or vice verse, it would result in leaks or other issues)

Kind regards,
Norbert
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