cifs.upcall debugging

cifs.upcall debugging

[Steve French]

This had should useful things about cifs.upcall (and an earlier one
about debugging cifs.upcall problems e.g. with krb5 mounts returning
errors)

http://sprabhu.blogspot.com/2019/06/howto-cifs-kerberos-mount.html

Shouldn't some of the cifs.upcall debugging info mentioned in an
earlier blog post be also added to wiki.samba.org ? e.g.

http://wiki.samba.org/index.php/LinuxCIFS_troubleshooting

Any suggestions on how to debug cases where klist shows the principal
but cifs.upcall can't find it - see log entry:

get_tgt_time: unable to get principal

-- 
Thanks,

Steve

Re: cifs.upcall debugging

[Sachin Prabhu]

Hello Steve,

Good to hear from you. I will consider what parts should be added to
the wiki. It has been so long since I've debugged this part, that I
need to refresh my memory before I can give you a good answer.

get_tgt_time: unable to get principal

The strace for the cifs.upcall helper is available at
http://sprabhu.blogspot.com/2014/12/debugging-calls-to-cifsupcall.html
The debug logging for the cifs.upcall is pretty good and if you can
see the debug output, you can get a pretty good idea. If not, the
strace will show where it fails in obtaining the tgt and usually
contains the debug messages from the cifs.upcall.

Sachin Prabhu

On Thu, 29 Sept 2022 at 05:43, Steve French <smfrench@gmail.com> wrote:
>
> This had should useful things about cifs.upcall (and an earlier one
> about debugging cifs.upcall problems e.g. with krb5 mounts returning
> errors)
>
> http://sprabhu.blogspot.com/2019/06/howto-cifs-kerberos-mount.html
>
> Shouldn't some of the cifs.upcall debugging info mentioned in an
> earlier blog post be also added to wiki.samba.org ? e.g.
>
> http://wiki.samba.org/index.php/LinuxCIFS_troubleshooting
>
> Any suggestions on how to debug cases where klist shows the principal
> but cifs.upcall can't find it - see log entry:
>
> get_tgt_time: unable to get principal
>
> --
> Thanks,
>
> Steve