Bug 9310 - Connection to Samba share from Windows 7 client fails with PANIC sys_setgroups failed in samba log
Summary: Connection to Samba share from Windows 7 client fails with PANIC sys_setgrou...
Alias: None
Product: Samba 3.6
Classification: Unclassified
Component: File services (show other bugs)
Version: 3.6.3
Hardware: All Linux
: P5 normal
Target Milestone: ---
Assignee: Volker Lendecke
QA Contact: Samba QA Contact
Depends on:
Reported: 2012-10-21 10:12 UTC by Niels Albers
Modified: 2014-07-26 11:51 UTC (History)
1 user (show)

See Also:

samba log for client involved (871.22 KB, text/plain)
2012-10-21 10:12 UTC, Niels Albers
no flags Details

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Description Niels Albers 2012-10-21 10:12:59 UTC
Created attachment 8091 [details]
samba log for client involved

When connecting to a samba share (\\<servername>\Public) running on a Unbuntu 12.04 server running samba 3.6.3, from a client running windows 7, I receive the error : The specified network name is no longer available. 

On the server, the log shows a samba PANIC: sys-setgroups failed.

This problem suddenly showed up roughly 2 weeks ago, so it could be patch related (either windows or samba-side). No config changes were made prior to problem showing up.

This is the config for Samba on the server:

	log file = /var/log/samba/log.%m
	passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
	obey pam restrictions = yes
	socket options = TCP_NODELAY
	map to guest = bad user
	winbind trusted domains only = no
	encrypt passwords = yes
	winbind use default domain = yes
	passdb backend = tdbsam
	passwd program = /usr/bin/passwd %u
	dns proxy = no
	netbios name = <servername>  #real name removed
	server string = %h server (Samba, Ubuntu)
	unix password sync = yes
	workgroup = WORKGROUP
	os level = 20
	syslog = 0
	panic action = /usr/share/samba/panic-action %d
	usershare allow guests = yes
	max log size = 1000
	pam password change = yes
	create mask = 0700
	comment = All Printers
	printable = yes
	guest only = yes
	public = yes
	path = /var/spool/samba
	guest ok = no
	comment = Printer Drivers
	writable = no
	path = /var/lib/samba/printers

	writeable = yes
	path = /home/Public
	force group = shrpublic
	force user = nralbers
	comment = Public data share
	guest only = yes
	public = yes
Comment 1 Niels Albers 2012-10-21 19:17:34 UTC
Okay, did some more research. The problem looks to be kernel-related.
Problem exists while i'm running:
Linux <servername> 3.5.0-1-generic #1~precise-Ubuntu SMP Mon Jun 25 17:55:09 UTC 2012 i686 i686 i386 GNU/Linux

but disappears when I reboot into
Linux <servername> 3.2.0-30-generic-pae #48-Ubuntu SMP Fri Aug 24 17:14:09 UTC 2012 i686 i686 i386 GNU/Linux

Strangely, it didn't appear immediately after I moved to the 3.5.0-1 kernel. The kernel version i'm using is out of a PPA supplied by Kamal Mostafa (https://launchpad.net/~kamalmostafa/+archive/bufferbloat), and is part of some ongoing research on my part into Bufferbloat prevention.

Anyway, i've managed to fix my problem, but this may be of interest for when kernel version 3.5 moves into the mainstream.
Comment 2 Björn Jacke 2014-07-26 11:51:37 UTC
not a samba issue