[Samba] Strange logs from smbd

[Roy Eastwood]

On 01 April 2021 15:01 Ralph Boehme wrote:
> Am 4/1/21 um 3:58 PM schrieb Ralph Boehme:
> > Am 4/1/21 um 1:11 PM schrieb Roy Eastwood via samba:
> >> I have a member server running in a LXD privileged container using a
> >> btrfs storage pool for the container.   I have been getting logs in
> >> the form:
> >>
> >> Apr  1 10:09:35 lxd-m1 smbd[4586]:   btrfs_fget_compression: /proc
> >> open of /proc/self/fd/50 failed: Permission denied
> >>
> >> Is this an artefact of running samba in a container and can these be
> >> ignored or is it a problem I should be worried about?   Any advice
> >> will be appreciated.
> >
> > this is definitely something to worry about. I assume this is happening
> > with Samba 4.14? That uses a new internal infrastructure code that makes
> > use of re-opening fds via /proc/self/fd.
> >
> > I've just checked and I don't see a problem inside a privileged podmain
> > container on kernel 5.10.22-200.fc33.x86_64 (latest Fedora).
> 
> fwiw, it seems the SYS_PTRACE cap is needed.
> 
> -slowcap
Yes, it's version 4.14.2.    I noticed it also with version 14.4.0 but today had over 40 such logs which got my attention!

cap_sys_ptrace is enabled on the container.    Not familiar with ptrace though so will need help if you need debug info.
Thanks.
Roy