memory leakage messages (no talloc stackframe)

[Doug Smythies]

[Impact]

 * Warning messages related to memory leaks "no talloc stackframe at"
   are present at login and other PAM services when libpam-smbpass is
   installed.

 * Backporting the fix resolves the warning messages and memory leak.

 * The upload incorporates the upstream fix from Samba.

[Test Case]

 * On a Trusty 14.04 system:
   1. sudo apt-get install libpam-smbpass
   2. sudo passwd <user on the system>
   3. if bug is present in samba, then the output looks like:

% sudo passwd <user>
no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory
Enter new UNIX password:

   4. After applying the updated packages the 'no talloc stackframe at'
   message is no longer present during step 2.

[Regression Potential]

 * The changes are in the area of samba password authentication so it would be worth exercising Samba client password manipulation.

[Original Description]
This message appears a lot as of a recent update to samba (Trusty development branch):

no talloc stackframe at ../source3/param/loadparm.c:4831, leaking memory

From this upstream bug report, I am lead to believe the issue is in libpam-smbpass, but I don't really know for sure.

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=728666

I am filing this bug report mainly so that I can refer to it on the testing tracker as an issue, while still setting the test case to pass. Note that other than the error message itself, I am not aware of any bad side effect.

doug@v32-serv04:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu Trusty Tahr (development branch)
Release: 14.04
Codename: trusty

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1257186

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[James Dupin (james.dupin)]

this "problem" appears after installation of libpam-smbpass and disappears when this program is removed

[anake (g-n-sivalingam)]

I also have this issue. It appears to have also been raised at the samba bugzilla page:

https://bugzilla.samba.org/show_bug.cgi?id=10420

[Sander Jonkers (jonkers)]

I can confirm James Dupin's post: gone after "sudo apt-get remove libpam-smbpass".

See http://ubuntuforums.org/showthread.php?t=2214042 with my experience before I saw this post.

[Sander Jonkers (jonkers)]

PS:

So that Google will find it, I'll post my exact message with a different (line?) number:

"no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory"

HTH

[Ryan Beisner (1chb1n)]

This bug exists in Trusty Server ISO 2014-APR-02.

I'm getting this error upon each login, and periodically during my console sessions:

     no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory

Nominated for Trusty series.

[David Peters (daveshow)]

Confirmed to jonkers post #5 removing libpam-smbpass removes the error.

[Arup (arup-chowdhury)]

Confirmed I have same issue with 14.04 x64 beta updated as well.

[Ryan Beisner (1chb1n)]

Issue exists in Trusty server ISO 2014-APR-09.

Workaround confirmed, but I've not explored other potential effects of removing this package:
sudo apt-get remove libpam-smbpass

[Dmitry Veltishev (vdmit)]

Confirming this issue on 14.04 release (x64, if it's important).

[Swapnil A Wagh (wagh-aswapnil)]

Confirmed I also have same issue with 14.04 x64 beta updated as well.

no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory

[trinkity (trinkity)]

when restart apache
no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory
 * Restarting web server apache2 [ OK ]

[Thomas Reusch (reusch)]

Confirmed with 14.04 (x86) and latest updates.

Fresh install with minimal iso; afterwards in tasksel selected "Basic Ubuntu Server", "OpenSSH server", "Mail-Server" and "Samba file server".
When sudo-ing the first time after running tasksel, the error occured.

Fix:
run "pam-auth-update" and remove "SMB password synchronization".

[Quentin (quentin-divay)]

Confirmed with 14.04 x64, every time i run the sudo command :

quentin@asus-N56VZ:~$ sudo su
[sudo] password for quentin:
no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory
root@asus-N56VZ:/home/quentin#

[Jacco van der Post (jacco-v)]

Confirmed, solution of Thomas works for me, thanks.

[Douglas Fink (doug1654)]

I have had the same issue since upgrading 13.10 to 14.04. Thomas solution did not work for me.

[Rory Jaffe (rsjaffe)]

Upgraded 13.10 x64 server to 14.04. Consistently seeing this message whenever running sudo. For example,

xxx@xxx:/$ sudo -e testfile
[sudo] password for xxx:
no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory

[wxdubuntu (wxd11011)]

Confirming this issue on 14.04 LTS release (x64).

[wylnux (wilpgam)]

Im upgrade of Ubuntu 13.10 2 ubuntu 14.04 yesterday and,
im ever at use a sudo comand . receive its message:

wylnux@expariom:/$ sudo su
[sudo] password for wylnux:
no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory

and im proced to uninstall "libpam-smbpass" with:

wylnux@expariom:/$ sudo apt-get remove libpam-smbpass

and work perfectly... thanks so much
Comfirm this solution work...

[pieterjanvu (pieterjanvu)]

Although removing the package may fix the message, libpam-smbpass is required to sync user accounts with samba passwords. Removing that packaging removes that functionality.

[Robie Basak (racb)]

Reproduced on a fresh Trusty cloud image. Steps to reproduce:

1. apt-get install libpam-smbpass
2. sudo passwd ubuntu

Expected result:

Enter new UNIX password:

Actual result:

no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory
Enter new UNIX password:

This should help with verifying a fix.

[Robie Basak (racb)]

@wilpgam

Do you intend to work on this yourself, or did you assign the bug to yourself by accident? I'll assume the latter?

[wylnux (wilpgam)]

@pieterjanvu @Robie Basak... thanks 4 ur reply
obviously if I uninstall this functionality, entered into security risk when working in large companies and ports are shared. but this solution is only in my case because I work on a single network, mine ....
and do not recommend it, but in my case to do this I lose the functionality that provides security ... (sorry 4my Inglés)

My question: How fix

how to fix that this message appearing not more without disabling lib?....
....

[Marco Scacchi (scamar)]

As Thomas (reusch) suggest in #14 :
____
Fix:
run "pam-auth-update" and remove "SMB password synchronization".
____

This isn't a security issue, simply you must remember that your samba password may not match your system password.
In an enterprise enviroment, if ubuntu is used as samba server, i bet it use kerberos tickets to verify the users identity throught domain controller or alternative ldap infrastructure.

[Robie Basak (racb)]

I tried the patch in the upstream bug, but this did not fix my test case. For the record, I'll attach the debdiff I attempted (that doesn't work).

[Thomas Jensen (uckcdkf8m0ju0r9-thomas)]

I accidentally hit the status of this bug and changed it, now I can't change it back. Sorry for the trouble!

[Dave Gilbert (ubuntu-treblig)]

Thomas: I've flipped it back.

[Eric MORAND (eric-morand+launchpad)]

This importance of this bug should probably be reexamined, because it has impact on other softwares, like Netatalk. It prevents AFP shares from being accessible and make Netatalk totally useless.

Here is a syslog trace where Netatalk crash because of this bug :

May 17 10:48:29 ace-of-spades afpd[3498]: ===============================================================
May 17 10:48:29 ace-of-spades afpd[3498]: INTERNAL ERROR: Signal 11 in pid 3498 (2.2.2)
May 17 10:48:29 ace-of-spades afpd[3498]: ===============================================================
May 17 10:48:29 ace-of-spades afpd[3498]: BACKTRACE: 3 stack frames:
May 17 10:48:29 ace-of-spades afpd[3498]: #0 /usr/sbin/afpd(netatalk_panic+0x1f) [0x7f4acaaf08bf]
May 17 10:48:29 ace-of-spades afpd[3498]: #1 /usr/sbin/afpd(+0x549bc) [0x7f4acaaf09bc]
May 17 10:48:29 ace-of-spades afpd[3498]: #2 /lib/x86_64-linux-gnu/libc.so.6(+0x36ff0) [0x7f4ac9440ff0]

See this bug report : https://bugs.launchpad.net/ubuntu/+source/netatalk/+bug/810732

Disabling SMB password synchronization (for example with pam-auth-update) not onyl remove the error message of this bug but also restore Netatalk behavior.

[Larry Chipps (larry-chipps7)]

I had been experiencing this bug until I set up RSA authentication for all my console sessions, and disabled password notifications. Once I did that, I have not seen any recurrences.

[Larry Chipps (larry-chipps7)]

I should have said password authentications there- not password notifications.

[Larry Chipps (larry-chipps7)]

and after two error free days, the error returned after a successful install and configuration of Minidlna...err... ReadyMedia if the copyright police are lurking.

[Arup (arup-chowdhury)]

I am affected with the same bug on my Trusty Thar but unfortunately solution on post number 14 leads to unable to retrieve shares list so have to turn the smb pass synchronization on to gain access to samba shared folders.

[Neeraz Poudel (v-info-m)]

after i run this command "sudo apt-get remove libpam-smbpass"
ubuntu doesnt start.
i see the Ubuntu logo with dots below and then a blank screen after that.
if i close lid and open again i see button labeled with [OK] and nothing happens.
please help.

[Hanine HAMZIOUI (hanynowsky)]

"sudo pam-auth-update " did the trick for me.

[jerry moss (gfmoss)]

confirming affects server 14.04 installed by netboot, with smb file and print server, ssh server, selected.

[doliveira (nquare)]

Hi,

I have a HP Microserver N40L and on a fresh installation of Ubuntu Server 14.04 LTS i get the same Leaking Memory Problem.

Because im new using Ubuntu Server, can please someone please help me on this and respond to 3 simple questions i have:

1- Besides removing "libpam-smbpass" is there any other solution for this problem?

2- Until Ubuntu team releases a fix / update for this, can i still use Ubuntu Server 14.04 LTS, without problems? How does this memory leaking problem affects my system?

3- On the installation process i choose to install Samba. If i don't install Samba will the Leaking Memory problem still happen?

Thanks

[Wayne (wayne-okuma)]

On fresh 14.04 install with "Samba File Server" selected during install...I hit the same "leaking memory" message when i 'sudo su'. Confirmed was able to run 'pam-auth-update' and deselected "SMB password synchronization" option in the pam-auth-update UI and the "leaking memory" no longer appears. However, i don't know if this actually prevents the memory leak or if there are any other side-effects.

[Gerald Drouillard (gerald-drouillard)]

Disabling the module with pam-auth-update makes the problem go away for me. If I re-enable the problem comes back.

This should be a HIGH priority bug.

The problem will occur after a successful su command.

Running with all the available patches available today.

[Mika Anttila (mika-anttila)]

I installed the 14.04.1 LTS for my server. Samba was not selected during the installation. I Installed it manually without a problem. The problem occured immediately after installing the libpam-smbpass. My Samba version is 4.1.6-Ubuntu

This issue seems to be resolved by the samba team already in July (https://bugzilla.samba.org/show_bug.cgi?id=8449). It says it has been fixed in 4.1 but the fix is not in 4.1 for Ubuntu ?

Having a fix in 14.10 is not a resolution. 14.04 is a LTS for (production) servers and must receive the fix through normal package upgrades. Is this bug really "not assigned" in the Ubuntu team ?

[monochromec (monochromec)]

It would be interesting to hear about timelines from upstream Canonical support when the fix is finally integrated in the 14.04 LTS codebase.

Any updates on this?

[Luca Reverberi (socketreve)]

No one can make a patch for this release?
We have to wait for ubuntu-14.04.2 ? really?

This MUST be a HIGH priority bug!

[Heiko (heiko-barg)]

I also can't understand why it is not fixed already. Because on 14.10 the fix is already released ...so it exists one! :-(

[Arthur (ikkeniet)]

Another Ubuntu user with the same memory leak issue.
Just like others said, how can it be that the LTS version hasn't got the fix that was already released in July?
This is another one of these "Linux quirks" that makes you wonder if using LTS was worth it?
 Should be top priority but seemingly the devs do not care. I'm puzzled.

[peter flaxer (bnutuone-x-loki04)]

On my machine message looks like this (i.e. when i sudo winecfg):

xxx@xxx-pc:~$ sudo winecfg
[sudo] password for xxx:
no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory
Ignoring unknown parameter "password level"
Ignoring unknown parameter "update encrypted"
wine: /home/xxx/.wine is not owned by you

I have all kind of samba packages installed, also the libpam stuff and pam auth, took me 2 hours to get samba to browser my network, then my user password was changed, when samba and ubuntu passwords where synced, the i had to re-passwd my user, now samba works, ubuntu works, but i get this message. i must say that samba has to be considered completely broken on ubuntu 14.04 LTS as the "Local network share"-feature in the File manager does nothing useful at all, it just doenst bring samba to life, one has to install samba by hand and go through the hole pain in the ass smb.conf procedure, as sambe is a pure pain in the ass to configure.
gtz

[Achim Behrens (k1l)]

i really cant think how this could be waited so long to ship a fix. this is really not acceptable.

[Nick Minkler (nick-minkler)]

Still broken in 14.04.2.

[Emmanuel Chanel (emmanuelchanel)]

This error makes my dovecot's auth-worker get down since I use both system accounts and virtual mail boxes... So it's serious to me... Probably, there occur such problems...

[Mark Wilson (mark-wilson-d)]

Confirmed in Ubuntu 14.04.02 LTS after recent upgrade from Ubuntu 12.04 LTS.

[Brian Trotter (brian-trotter)]

Confirmed in Ubuntu 14.04.02 LST after fresh install.

[Brian Trotter (brian-trotter)]

Correction: make that 14.04.02 LTS Server.

[peter flaxer (bnutuone-x-loki04)]

I also get it when starting python:
Ignoring unknown parameter "password level"
Ignoring unknown parameter "update encrypted

[23W (kyselgov)]

Confirmed in Ubuntu 14.04.02 LST x64 after fresh install.

[Geoffrey McClinsey (geoffmcc)]

Confirmed in Ubuntu 14.04.02 LST x64.

I did not notice it until after I updated, but maybe it was there.

[Olli Ovaskainen (olli-ovaskainen)]

Confirmed in Ubuntu 14.04.02 LST x64.
Fresh install.

[Chad (chad-z)]

Still and issue. Ubuntu 14.04.2 LTS (GNU/Linux 3.16.0-37-generic x86_64)

chad@server:~$ sudo su
[sudo] password for chad:
no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory
root@server:/home/chad#

[CaesarS (cmsamsi)]

Wow, this bug has a long history.

I can confirm the issue as well with 4.1.6 and 4.2.1 I've isolated to the line:

auth optional pam_smbpass.so migrate

Configured in /etc/pam.d/common-auth

That line is added by libpam package installation and also by using pam-auth-update to enable SMB Password Synchronization

For 4.2.1 the error however occurs in su:

*** Error in `su': double free or corruption (fasttop): 0x000000000110d800 ***
Aborted

Which happens after the password is entered.

[Ian (iguy)]

This is happening still in 14.04.2.

I installed libpam-smbpass:amd64 2:4.1.6+dfsg-1ubuntu2.14.04.7

Whenever I do sudo commands and login in the issue shows up with talloc.

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.2 LTS
Release: 14.04
Codename: trusty

[Ian Abbott (ian-abbott)]

I think this should be easy to fix if Canonical can find anyone to assign the bug to. I managed to fix it locally by following the guide at https://help.ubuntu.com/community/UpdatingADeb to rebuild the samba packages from source with the upstream patch applied. For the final step, I used "sudo debi -u" instead of "sudo debi" to only upgrade the existing packages instead of installing all of them.

[James Knox (binarymonk)]

I can also confirm this is still an issue:

no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory

SYSTEM SETTINGS:

Operating system : Linux Mint 17.1 Cinnamon 64bit
Cinnamon Version : 2.4.5
Linux Kernel : 3.13.0-37 generic

Confirmed no longer an issue once "libpam-smbpass" removed.

[Xavier L. (xav0989)]

This should me moved to the https://launchpad.net/ubuntu/+milestone/ubuntu-14.04.3 or https://launchpad.net/ubuntu/+milestone/ubuntu-14.04.4 milestone.

[Ian Abbott (ian-abbott)]

I'm not sure why unresolved bugs for missed milestones can't be moved to the next milestone automatically. Less chance of them being ignored that way!

[Donovan Long (donovan-long)]

Thank you #89. It's a PITA to do, but it does work as Ian described and the error no longer appears when I use sudo.

[Chad (chad-z)]

Xavier wrote that this needs to be moved somewhere else. Does anyone know how to do that? If someone can explain to me what needs to happen, I'll be happy to do it myself. Removing libpam-smbpass is not an option for me, nor is it, in my opinion, an appropriate "fix". I can't believe no one is looking at this.

[Doug Smythies (dsmythies)]

Chad wrote:
>Xavier wrote that this needs to be moved somewhere else.
> Does anyone know how to do that?
> If someone can explain to me what needs to happen,

I changed the trusty target from 14.04.2 (which is in the past) to 14.04.3 (which is in the future, albeit, not far off)

[gollum53 (smid)]

This bug also affects vsftpd functionality. When SMB password synchronisation is selected in pam-auth-update, vsftpd can not authenticate users and segfaults with OOPS message. This seems like a critical bug to me and should be corrected as soon as possible in a LTS server release...

[Robie Basak (racb)]

> This bug also affects vsftpd functionality. When SMB password synchronisation is selected in pam-auth-update, vsftpd can not authenticate users and segfaults with OOPS message.

This sounds like bug 1348972 in vsftpd and I don't think a fix to this samba bug will affect it.

[Ian Abbott (ian-abbott)]

gollum53 wrote in comment #96:
> This bug also affects vsftpd functionality. When SMB password synchronisation is selected in pam-auth-update, vsftpd can not authenticate users and segfaults with OOPS message.

I had a quick go at trying to reproduce that to see if I could install a modified libpam-smbpass to make the problem go away, but I was unable to reproduce it. That was probably related to these messages in my /var/log/auth.log:

Jun 23 11:33:20 ubuntu vsftpd: PAM unable to dlopen(pam_smbpass.so): /lib/security/pam_smbpass.so: cannot open shared object file: No such file or directory
Jun 23 11:33:20 ubuntu vsftpd: PAM adding faulty module: pam_smbpass.so

as the PAM modules such as pam_smbpass.so are actually installed in /lib/x86_64-linux-gnu/security/ on my 64-bit system, not /lib/security/. This is a separate issue with vsftpd not worth dwelling on in this bug, though I did try symlinking /lib/x86_64-linux-gnu/security to /lib/security and got these errors instead:

Jun 23 11:51:40 ubuntu vsftpd: PAM unable to dlopen(pam_smbpass.so): libsamba-hostconfig.so.0: failed to map segment from shared object: Cannot allocate memory
Jun 23 11:51:40 ubuntu vsftpd: PAM adding faulty module: pam_smbpass.so

At that point I gave up trying to reproduce the problem with vsftpd!

[Ryan Harper (raharper)]

I've confirmed that this is already fixed in Wily.

[Robie Basak (racb)]

SRU from Ryan Harper sponsored and uploaded. Thanks! Now awaiting review from the SRU team.

[Chad (chad-z)]

Would someone explain the last several updates? What is the SRU team and what kind of review are they performing? Finally (and possibly most importantly), how can the status be "In Progress" when the ticket is still "Unassigned"?

Thanks in advance!

[Ryan Harper (raharper)]

On Thu, Jun 25, 2015 at 7:44 PM, Chad <email address hidden> wrote:

> Would someone explain the last several updates? What is the SRU team
>
and what kind of review are they performing? Finally (and possibly most

Hi, I think most of your questions will be answered by looking at the
Stable Release Update wiki page:

https://wiki.ubuntu.com/StableReleaseUpdates

I've applied and tested the upstream fix for this issue to the Samba
package in trusty.
I've confirmed that the fix that's upstream in Samba is not present in the
current development release (Wily)
And I've packaged up the fix for trusty and submitted for the SRU team to
review. If approved, there will be
a test package published to be verified and if all goes well it will be
released into the
Trusty updates stream.

importantly), how can the status be "In Progress" when the ticket is
> still "Unassigned"?
>

Work is under-way, specially the Trusty SRT task is in progress; bug
assignment isn't required AFAIK.

Hope that helps,
Ryan

[Chris J Arges (arges)]

Hello Doug, or anyone else affected,

Accepted samba into trusty-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/samba/2:4.1.6+dfsg-1ubuntu2.14.04.8 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

[stop (whoopwhoop)]

I did a dist-upgrade with trusty proposed and the leakage message is gone for me...

[Ian Abbott (ian-abbott)]

libpam-smbpass 2:4.1.6+dfsg-1ubuntu2.14.04.8 fixes it for me.

[jswinner (jswinner)]

Unable to test at this time, too many umet dependencies

[Launchpad Janitor (janitor)]

This bug was fixed in the package samba - 2:4.1.6+dfsg-1ubuntu2.14.04.8

---------------
samba (2:4.1.6+dfsg-1ubuntu2.14.04.8) trusty; urgency=medium

  * Fix for "no talloc stackframe at" warning messages (LP: #1257186)

 -- Ryan Harper <email address hidden> Mon, 22 Jun 2015 08:48:37 -0500

[Brian Murray (brian-murray)]

The verification of the Stable Release Update for samba has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.