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Description of problem:
Memory leak in RPC server could allocate a lot of memory for print servers

On a heavily loaded Samba printserver with several hundred queque it was noted that after upgrading from 4.6 to 4.13 smbd processes were eating up memory over the cause of a few days.

As an example the smbd process with the highest resided set size was

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 7657 WIN\pet+  20   0 1369160 398484   7824 S   0,0  2,5   1:02.80 smbd

398 MB...

talloc report of the process:

  full talloc report on 'null_context' (total 153473847 bytes in 2253252 blocks)

153 MB....

The talloc report has a myriad duplicate printer related metadata objects. The talloc report is 2M lines, still grinding through it.

FYI, this was fixed by a backport in Fedora 34: https://bugzilla.redhat.com/show_bug.cgi?id=1946950

*** Bug 1971714 has been marked as a duplicate of this bug. ***

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (samba bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:4438