Re: kernel-5.18.8 breaks cifs mounts

[Steve French <smfrench@gmail.com>]

I was able to reproduce it to older Samba server (4.12.5) and could
workaround the Samba server bug by using mount option "compress" on
the client (which won't do anything different since it is not
supported but  interestingly it avoids the problem by adding another
context at the end).

On Wed, Jul 6, 2022 at 6:18 AM Julian Sikorski <belegdol@gmail.com> wrote:
>
> Am 04.07.22 um 18:29 schrieb Julian Sikorski:
> >
> >
> > Am 03.07.22 um 19:51 schrieb Stefan Metzmacher:
> >> Am 03.07.22 um 07:01 schrieb Steve French:
> >>> I lean toward thinking that this is a Samba bug (although I don't see
> >>> it on my local system - it works to samba for me, although I was
> >>> trying against a slightly different version, Samba 4.15.5-Ubuntu).
> >>>
> >>> Looking at the traces in more detail they look the same (failing vs.
> >>> working) other than the order of the negotiate context, which fails
> >>> with POSIX as the 3rd context, and netname as the 4th, but works with
> >>> the order reversed (although same contexts, and same overall length)
> >>> ie with POSIX context as the fourth one and netname context as the
> >>> third one.
> >>>
> >>> The failing server code in Samba is in
> >>> smbd_smb2_request_process_negprot but I don't see changes to it
> >>> recently around this error.
> >>>
> >>> Does this fail to anyone else's Samba version?
> >>>
> >>> This is probably a Samba server bug but ... seems odd since it doesn't
> >>> fail to Samba for me.
> >>>
> >>> Jeremy/Metze,
> >>> Does this look familiar?
> >>
> >> Maybe this one:
> >>
> >> https://git.samba.org/?p=samba.git;a=commitdiff;h=147dd9d58a429695a3b6c6e45c8b0eaafc67908a
> >>
> >>
> >> that went only into 4.15 and higher.
> >>
> >> metze
> >
> > Nice catch, I can confirm that adding this patch to debian samba
> > 2:4.13.13+dfsg-1~deb11u3 package makes the mounts work again. How do we
> > get this patch into debian?
> >
> > Best regards,
> > Julian
> I have now filed a bug against debian samba package:
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1014453
>
> Best regards,
> Julian



-- 
Thanks,

Steve