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Message #09039
[Bug 1997960] [NEW] SMB Client Segfault happening every couple of seconds
Public bug reported:
On a 22.04 LTS server with Librenms installed I'm receiving constant
panics from the smbclient:
Panic emails to root
=====================
The Samba 'panic action' script, /usr/share/samba/panic-action,
was called for PID 1595640 (/usr/bin/smbclient).
This means there was a problem with the program, such as a segfault.
Below is a backtrace for this process generated with gdb, which shows
the state of the program at the time the error occurred. The Samba log
files may contain additional information about the problem. If the problem persists, you are encouraged to first install the
samba-dbgsym package, which contains the debugging symbols for the Samba
binaries. Then submit the provided information as a bug report to
Ubuntu by visiting this link:
https://launchpad.net/ubuntu/+source/samba/+filebug [Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007f2e36bfa45a in __GI___wait4 (pid=1595645, stat_loc=stat_loc@entry=0x7ffe3c62cc28, options=options@entry=0, usage=usage@entry=0x0) at ../sysdeps/unix/sysv/linux/wait4.c:30
#0 0x00007f2e36bfa45a in __GI___wait4 (pid=1595645, stat_loc=stat_loc@entry=0x7ffe3c62cc28, options=options@entry=0, usage=usage@entry=0x0) at ../sysdeps/unix/sysv/linux/wait4.c:30 #1 0x00007f2e36bfa41b in __GI___waitpid (pid=<optimized out>, stat_loc=stat_loc@entry=0x7ffe3c62cc28, options=options@entry=0) at ./posix/waitpid.c:38 #2 0x00007f2e36b60bcb in do_system (line=<optimized out>) at ../sysdeps/posix/system.c:171 #3 0x00007f2e3711a64f in smb_panic_s3 () from /lib/x86_64-linux-gnu/libsmbconf.so.0 #4 0x00007f2e36ec3d2e in smb_panic () from /lib/x86_64-linux-gnu/libsamba-util.so.0 #5 0x00007f2e36ec4695 in ?? () from /lib/x86_64-linux-gnu/libsamba-util.so.0 #6 <signal handler called> #7 0x00007f2e36ba7681 in ___pthread_mutex_init (mutex=0x7f2e33001fe8, mutexattr=0x7ffe3c62d6a4) at ./nptl/pthread_mutex_init.c:89 #8 0x00007f2e365b6ac6 in ?? () from /lib/x86_64-linux-gnu/libtdb.so.1 #9 0x00007f2e365bea5c in tdb_open_ex () from /lib/x86_64-linux-gnu/libtdb.so.1 #10 0x00007f2e365d36c7 in tdb_wrap_open () from /usr/lib/x86_64-linux-gnu/samba/libtdb-wrap.so.0 #11 0x00007f2e37124362 in ?? () from /lib/x86_64-linux-gnu/libsmbconf.so.0 #12 0x00007f2e371253bd in gencache_parse () from /lib/x86_64-linux-gnu/libsmbconf.so.0 #13 0x00007f2e371254a6 in gencache_get_data_blob () from /lib/x86_64-linux-gnu/libsmbconf.so.0 #14 0x00007f2e37125582 in gencache_get () from /lib/x86_64-linux-gnu/libsmbconf.so.0 #15 0x00007f2e366e3aba in sitename_fetch () from /usr/lib/x86_64-linux-gnu/samba/libgse.so.0 #16 0x00007f2e366dfe38 in resolve_name_list () from /usr/lib/x86_64-linux-gnu/samba/libgse.so.0 #17 0x00007f2e371d5604 in ?? () from /usr/lib/x86_64-linux-gnu/samba/liblibsmb.so.0 #18 0x00007f2e371d59ed in cli_connect_nb () from /usr/lib/x86_64-linux-gnu/samba/liblibsmb.so.0 #19 0x00007f2e371f645f in ?? () from /usr/lib/x86_64-linux-gnu/samba/liblibsmb.so.0 #20 0x00007f2e371f697a in ?? () from /usr/lib/x86_64-linux-gnu/samba/liblibsmb.so.0 #21 0x00007f2e371f6b25 in cli_cm_open () from /usr/lib/x86_64-linux-gnu/samba/liblibsmb.so.0 #22 0x0000556aa1b8cf8e in main () A debugging session is active.
smb.conf
======================
[global]
## Browsing/Identification ###
# Change this to the workgroup/NT-domain name your Samba server will part of
workgroup = WORKGROUP
# server string is the equivalent of the NT Description field
server string = %h server (Samba, Ubuntu)
#### Networking ####
# The specific set of interfaces / networks to bind to
# This can be either the interface name or an IP address/netmask;
# interface names are normally preferred
; interfaces = 127.0.0.0/8 eth0
# Only bind to the named interfaces and/or networks; you must use the
# 'interfaces' option above to use this.
# It is recommended that you enable this feature if your Samba machine is
# not protected by a firewall or is a firewall itself. However, this
# option cannot handle dynamic or non-broadcast interfaces correctly.
; bind interfaces only = yes
#### Debugging/Accounting ####
# This tells Samba to use a separate log file for each machine
# that connects
log file = /var/log/samba/log.%m
# Cap the size of the individual log files (in KiB).
max log size = 1000
# We want Samba to only log to /var/log/samba/log.{smbd,nmbd}.
# Append syslog@1 if you want important messages to be sent to syslog too.
logging = file
# Do something sensible when Samba crashes: mail the admin a backtrace
panic action = /usr/share/samba/panic-action %d
####### Authentication #######
# Server role. Defines in which mode Samba will operate. Possible
# values are "standalone server", "member server", "classic primary
# domain controller", "classic backup domain controller", "active
# directory domain controller".
#
# Most people will want "standalone server" or "member server".
# Running as "active directory domain controller" will require first
# running "samba-tool domain provision" to wipe databases and create a
# new domain.
server role = standalone server
obey pam restrictions = yes
# This boolean parameter controls whether Samba attempts to sync the Unix
# password with the SMB password when the encrypted SMB password in the
# passdb is changed.
unix password sync = yes
# For Unix password sync to work on a Debian GNU/Linux system, the following
# parameters must be set (thanks to Ian Kahan <<kahan@xxxxxxxxxxxxxxxxxxxxxxxxx> for
# sending the correct chat script for the passwd program in Debian Sarge).
passwd program = /usr/bin/passwd %u
passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
# This boolean controls whether PAM will be used for password changes
# when requested by an SMB client instead of the program listed in
# 'passwd program'. The default is 'no'.
pam password change = yes
# This option controls how unsuccessful authentication attempts are mapped
# to anonymous connections
map to guest = bad user
########## Domains ###########
#
# The following settings only takes effect if 'server role = classic
# primary domain controller', 'server role = classic backup domain controller'
# or 'domain logons' is set
#
# It specifies the location of the user's
# profile directory from the client point of view) The following
# required a [profiles] share to be setup on the samba server (see
# below)
; logon path = \\%N\profiles\%U
# Another common choice is storing the profile in the user's home directory
# (this is Samba's default)
# logon path = \\%N\%U\profile
# The following setting only takes effect if 'domain logons' is set
# It specifies the location of a user's home directory (from the client
# point of view)
; logon drive = H:
# logon home = \\%N\%U
# The following setting only takes effect if 'domain logons' is set
# It specifies the script to run during logon. The script must be stored
# in the [netlogon] share
# NOTE: Must be store in 'DOS' file format convention
; logon script = logon.cmd
# This allows Unix users to be created on the domain controller via the SAMR
# RPC pipe. The example command creates a user account with a disabled Unix
# password; please adapt to your needs
; add user script = /usr/sbin/adduser --quiet --disabled-password --gecos "" %u
# This allows machine accounts to be created on the domain controller via the
# SAMR RPC pipe.
# The following assumes a "machines" group exists on the system
; add machine script = /usr/sbin/useradd -g machines -c "%u machine account" -d /var/lib/samba -s /bin/false %u
# This allows Unix groups to be created on the domain controller via the SAMR
# RPC pipe.
; add group script = /usr/sbin/addgroup --force-badname %g
############ Misc ############
# Using the following line enables you to customise your configuration
# on a per machine basis. The %m gets replaced with the netbios name
# of the machine that is connecting
; include = /home/samba/etc/smb.conf.%m
# Some defaults for winbind (make sure you're not using the ranges
# for something else.)
; idmap config * : backend = tdb
; idmap config * : range = 3000-7999
; idmap config YOURDOMAINHERE : backend = tdb
; idmap config YOURDOMAINHERE : range = 100000-999999
; template shell = /bin/bash
# Setup usershare options to enable non-root users to share folders
# with the net usershare command.
# Maximum number of usershare. 0 means that usershare is disabled.
# usershare max shares = 100
# Allow users who've been granted usershare privileges to create
# public shares, not just authenticated ones
usershare allow guests = yes
#======================= Share Definitions =======================
# Un-comment the following (and tweak the other settings below to suit)
# to enable the default home directory shares. This will share each
# user's home directory as \\server\username
;[homes]
; comment = Home Directories
; browseable = no
# By default, the home directories are exported read-only. Change the
# next parameter to 'no' if you want to be able to write to them.
; read only = yes
# File creation mask is set to 0700 for security reasons. If you want to
# create files with group=rw permissions, set next parameter to 0775.
; create mask = 0700
# Directory creation mask is set to 0700 for security reasons. If you want to
# create dirs. with group=rw permissions, set next parameter to 0775.
; directory mask = 0700
# By default, \\server\username shares can be connected to by anyone
# with access to the samba server.
# Un-comment the following parameter to make sure that only "username"
# can connect to \\server\username
# This might need tweaking when using external authentication schemes
; valid users = %S
# Un-comment the following and create the netlogon directory for Domain Logons
# (you need to configure Samba to act as a domain controller too.)
;[netlogon]
; comment = Network Logon Service
; path = /home/samba/netlogon
; guest ok = yes
; read only = yes
# Un-comment the following and create the profiles directory to store
# users profiles (see the "logon path" option above)
# (you need to configure Samba to act as a domain controller too.)
# The path below should be writable by all users so that their
# profile directory may be created the first time they log on
;[profiles]
; comment = Users profiles
; path = /home/samba/profiles
; guest ok = no
; browseable = no
; create mask = 0600
; directory mask = 0700
[printers]
comment = All Printers
browseable = no
path = /var/spool/samba
printable = yes
guest ok = no
read only = yes
create mask = 0700
# Windows clients look for this share name as a source of downloadable
# printer drivers
[print$]
comment = Printer Drivers
path = /var/lib/samba/printers
browseable = yes
read only = yes
guest ok = no
# Uncomment to allow remote administration of Windows print drivers.
# You may need to replace 'lpadmin' with the name of the group your
# admin users are members of.
# Please note that you also need to set appropriate Unix permissions
# to the drivers directory for these users to have write rights in it
; write list = root, @lpadmin
** Affects: samba (Ubuntu)
Importance: Undecided
Status: New
** Tags: librenms segfault smbclient
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https://bugs.launchpad.net/bugs/1997960
Title:
SMB Client Segfault happening every couple of seconds
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