Re: get_printer_list_db: Failed to open printer_list.tdb

On 19.04.2026 08:21, Andreas Schneider via samba-technical wrote:
> On Saturday, 18 April 2026 08:44:49 Central European Summer Time Michael
> Tokarev wrote:

>> ..or maybe just revert
>>
>> commit 9080cd30d517cb50954e440bb4475c2eeb678906
>> Author: Andreas Schneider <[email protected]>
>> Date:   Wed Jun 22 18:56:26 2022 +0200
>>
>>       s3:printing: Do not clear the printer-list.tdb
>>
>> which seems to help too (Cc'ing asn@).
> 
> You read the full commit message of that commit, did you?

definitely.

The logic here is simple: since printer_list.tdb is never created -
and we're watching this issue for months, that file isn't there - and
everything works fine, - maybe this whole thing isn't needed at all.

> Isn't the obvious question, why is the rpcd_spoolss running as a user an not
> root? Without details and log files we don't know. Guessing and reverting
> random commit is not the way how to fix issues.

rpcd_spoolss switches from root to user right before trying to create
printer_list.tdb.  And switches back to root short after.   Maybe it's
missing unbecome_user() call.

It isn't random a random commit, it's the commit which introduced this
particular problem.

The logs don't tell much, since rpcd_spoolss doesn't have much logging.
Also, rpcd_spoolss seems to ignore log level setting in smb.conf, so
I can only turn logging on using smbcontrol, after it has been started.
And there it doesn't report about calls to become_user/unbecome_user,
even at level 9, yet it calls setresgid() to user and back to root, as
can be seen in strace.  http://www.corpit.ru/mjt/tmp/rpcd_spoolss.log
is an example of a level-10 log.

 > If you want to report a bug:
 >
 > https://hackmd.io/@asn/SkHk8rXBz

 > Please attach testparm -s info collect logs, open a bug at https://
 > bugzilla.samba.org/ and we can take a look what is going on.

Over the years I found out that submitting bugs to bugzilla.samba.org
is useless.  Ditto for writing emails to samba@ or samba-technical@ -
actually I think I mostly gave up there, not getting any interest at
all.

Sure, I'll try again.

Thanks,

/mjt

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