Ubuntu
samba package

Samba multi-channel multi-connection race condition

Lunar (23.04)
Bug #2031619

Bug #2031619 reported by Mike Silva on 2023-08-17

This bug affects 1 person

	Status	Importance	Assigned to
samba	Unknown	Unknown	samba-bugs #15346
samba (Ubuntu)	Status tracked in Mantic
Lunar	New	Undecided	Unassigned
Mantic	Fix Released	Undecided	Andreas Hasenack

Bug Description

There is a race condition bug in Samba 4.17 to 4.18.5 that repeatably causes connection mounts to fail when:
- A client is connecting to a multi-channel server. (Multi-channel has defaulted to on for all Samba package installs for some time.)
- A client is making multiple connections to said multi-channel server.

A patch has been released in Samba 4.18.6.

For the Samba bug on this issue, see:
https://bugzilla.samba.org/show_bug.cgi?id=15346

For details on the race condition and patch see:
https://gitlab.com/samba-team/samba/-/merge_requests/3209/diffs?commit_id=6961ad7ae2e02a8e5afe6bcfe0368d38a6117699

System Details: (note the bug is not architecture specific)
-----------------------------------------------------------
uname -a
Linux 6.2.0-1009-raspi #11-Ubuntu SMP PREEMPT Mon Jul 17 10:19:57 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux

lsb_release -rd
No LSB modules are available.
Description: Ubuntu Mantic Minotaur (development branch)
Release: 23.10

Package version
----------------------------------------------------------
samba/mantic,now 2:4.18.5+dfsg-1ubuntu2 arm64 [installed]
SMB/CIFS file, print, and login server for Unix

Related branches

~ahasenack/ubuntu/+source/samba:mantic-samba-merge-3

Merged into ubuntu/+source/samba:debian/sid at revision 7b56970dca7b822697a56ca8209fbc1b0855f484

git-ubuntu bot: Approve on 2023-08-17

Bryce Harrington (community): Approve on 2023-08-17

Canonical Server Reporter: Pending requested 2023-08-17

Andreas Hasenack (ahasenack) on 2023-08-17

Changed in samba (Ubuntu Mantic):
status:	New → In Progress
assignee:	nobody → Andreas Hasenack (ahasenack)

Revision history for this message

Mike Silva (mikesilva) wrote on 2023-08-18:

Sorry, for not linking this to Lunatic and Minotaur, Andreas. Didn't realize I could get that specific.

Revision history for this message

Launchpad Janitor (janitor) wrote on 2023-08-27:

This bug was fixed in the package samba - 2:4.18.6+dfsg-1ubuntu1

---------------
samba (2:4.18.6+dfsg-1ubuntu1) mantic; urgency=medium

  * Merge with Debian unstable (LP: #2031655, LP: #2031619). Remaining changes:
    - debian/control: Ubuntu i386 binary compatibility:
      + drop ceph support
      + enable the liburing vfs module, except on i386 where liburing is
        not available
    - d/t/control, d/t/util,d/t/samba-ad-dc-provisioning-internal-dns:
      samba AD DC provisioning and domain join tests with internal DNS
      (LP #1977746, LP #2011745)
  * Dropped:
    - build-depend on libglusterfs-dev only on !i386 arches
      [In 2:4.18.5+dfsg-2]
    - Add changes to fix uncaught exception when updating old password
      containing regex metacharacters by simplifying samba-tool password
      redaction (LP #2002949).
      + d/p/lib-cmdline-Return-if-the-commandline-was-redacted-i.patch
      + d/p/lib-cmdline-Also-redact-newpassword-in-samba_cmdline.patch
      + d/p/lib-cmdline-Also-burn-the-password2-parameter-if-giv.patch
      + d/p/samba-tool-Use-samba.glue.get_burnt_cmdline-rather-t.patch
      + d/p/python-Add-glue.burn_commandline-method.patch
      + d/p/python-Move-PyList_AsStringList-to-common-code-so-we.patch
      + d/p/python-Remove-const-from-PyList_AsStringList.patch
        [Fixed upstream in 4.18.6]
  * Added:
    - d/control: adjust breaks/replaces for file move that Debian did in
      4.16.6+dfsg-5, and Ubuntu only did in 4.17.7+dfsg-1ubuntu1, to avoid
      file conflict in a dist-upgrade from earlier Ubuntu releases, like
      Kinetic (LP: #2024663)
    - d/rules: ceph is not available in Ubuntu i386, disable it

-- Andreas Hasenack <email address hidden> Thu, 17 Aug 2023 09:52:00 -0300

Changed in samba (Ubuntu Mantic):
status:	In Progress → Fix Released

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