[Pkg-samba-maint] Bug#968036: samba: segfault with aio_pthread

Josep M. Perez josep.m.perez at gmail.com
Fri Aug 7 09:33:25 BST 2020


Package: samba
Version: 2:4.12.5+dfsg-3
Severity: normal
Tags: upstream
X-Debbugs-Cc: josep.m.perez at gmail.com

Dear Maintainer,

   * What led up to the situation?
Enabled aio_pthread.

   * What exactly did you do (or not do) that was effective (or
     ineffective)?
Access by a Mac OS client seems to crash smbd from time to time.

   * What was the outcome of this action?
   * What outcome did you expect instead?

A backtrace of the crash follows:

Core was generated by `/usr/sbin/smbd --foreground --no-process-group'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007fc960969cb1 in __clear_internal_signals (set=<optimized out>) at
../sysdeps/unix/sysv/linux/internal-signals.h:74
74      ../sysdeps/unix/sysv/linux/internal-signals.h: No such file or
directory.
[Current thread is 1 (Thread 0x7fc95f144a40 (LWP 70077))]
(gdb) bt
#0  0x00007fc960969cb1 in __clear_internal_signals (set=<optimized out>) at
../sysdeps/unix/sysv/linux/internal-signals.h:74
#1  __libc_signal_block_app (set=0x7ffedd750e20) at
../sysdeps/unix/sysv/linux/internal-signals.h:75
#2  __GI_raise (sig=0, sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:40
#3  0x00007fc960953537 in __GI_abort () at abort.c:79
#4  0x00007fc9612cd350 in dump_core () at ../../source3/lib/dumpcore.c:338
#5  0x00007fc9612f72f6 in smb_panic_s3 (why=0x7fc961704ce6 "internal error") at
../../source3/lib/util.c:853
#6  0x00007fc9616f2b9f in smb_panic (why=why at entry=0x7fc961704ce6 "internal
error") at ../../lib/util/fault.c:174
#7  0x00007fc9616f2dfd in fault_report (sig=11) at ../../lib/util/fault.c:88
#8  sig_fault (sig=11) at ../../lib/util/fault.c:99
#9  <signal handler called>
#10 0x00007fc9616ef892 in timeval_add (tv=tv at entry=0xb8, secs=20, usecs=0) at
../../lib/util/time.c:651
#11 0x00007fc9616ef8dc in timeval_sum (tv1=tv1 at entry=0xb8,
tv2=tv2 at entry=0x7ffedd751780) at ../../lib/util/time.c:663
#12 0x00007fc96150f5ee in request_timed_out (req=req at entry=0x0, timeout=...) at
../../source3/smbd/open.c:2659
#13 0x00007fc961517f4f in schedule_async_open (req=0x0) at
../../source3/smbd/open.c:3008
#14 open_file_ntcreate (fsp=<optimized out>, pinfo=0x7ffedd7518b0,
private_flags=16, lease=<optimized out>, oplock_request=8,
new_dos_attributes=0, create_options=0,
    create_disposition=3, share_access=7, access_mask=<optimized out>, req=0x0,
conn=0x55fc377c0a70) at ../../source3/smbd/open.c:3719
#15 create_file_unixpath (conn=conn at entry=0x55fc377c0a70, req=req at entry=0x0,
smb_fname=smb_fname at entry=0x55fc37980d70, access_mask=access_mask at entry=0,
    share_access=share_access at entry=7,
create_disposition=create_disposition at entry=3, create_options=0,
file_attributes=0, oplock_request=8, lease=<optimized out>,
    allocation_size=0, private_flags=16, sd=0x0, ea_list=0x0,
result=0x7ffedd751d18, pinfo=0x0) at ../../source3/smbd/open.c:5592
#16 0x00007fc961515bda in create_file_unixpath (conn=conn at entry=0x55fc377c0a70,
req=req at entry=0x55fc377fcf80, smb_fname=smb_fname at entry=0x55fc3791b3d0,
    access_mask=access_mask at entry=386, share_access=share_access at entry=7,
create_disposition=create_disposition at entry=5, create_options=0,
file_attributes=128, oplock_request=0,
    lease=<optimized out>, allocation_size=0, private_flags=0, sd=0x0,
ea_list=0x0, result=0x7ffedd7520e8, pinfo=0x7ffedd7520e4) at
../../source3/smbd/open.c:5512
#17 0x00007fc961518ff8 in create_file_default (conn=0x55fc377c0a70,
req=0x55fc377fcf80, root_dir_fid=<optimized out>, smb_fname=0x55fc3791b3d0,
access_mask=386, share_access=7,
    create_disposition=5, create_options=0, file_attributes=128,
oplock_request=0, lease=0x0, allocation_size=0, private_flags=0, sd=0x0,
ea_list=0x0, result=0x55fc378e23d8,
    pinfo=0x55fc378e23ec, in_context_blobs=0x7ffedd752390,
out_context_blobs=0x55fc378e25f0) at ../../source3/smbd/open.c:6010
#18 0x00007fc95ea43f47 in fruit_create_file (handle=0x55fc377c09d0,
req=0x55fc377fcf80, root_dir_fid=<optimized out>, smb_fname=0x55fc3791b3d0,
access_mask=386, share_access=7,
    create_disposition=5, create_options=0, file_attributes=128,
oplock_request=0, lease=0x0, allocation_size=0, private_flags=0, sd=0x0,
ea_list=0x0, result=0x55fc378e23d8,
    pinfo=0x55fc378e23ec, in_context_blobs=0x7ffedd752390,
out_context_blobs=0x55fc378e25f0) at ../../source3/modules/vfs_fruit.c:4035
#19 0x00007fc96154de75 in smbd_smb2_create_send (in_context_blobs=...,
in_name=<optimized out>, in_create_options=<optimized out>,
in_create_disposition=<optimized out>,
    in_share_access=<optimized out>, in_file_attributes=<optimized out>,
in_desired_access=<optimized out>, in_impersonation_level=<optimized out>,
in_oplock_level=<optimized out>,
    smb2req=0x55fc37904230, ev=<optimized out>, mem_ctx=0x55fc37904230) at
../../source3/smbd/smb2_create.c:983
#20 smbd_smb2_request_process_create (smb2req=smb2req at entry=0x55fc37904230) at
../../source3/smbd/smb2_create.c:268
#21 0x00007fc96154557e in smbd_smb2_request_dispatch
(req=req at entry=0x55fc37904230) at ../../source3/smbd/smb2_server.c:2709
#22 0x00007fc961546290 in smbd_smb2_io_handler (fde_flags=<optimized out>,
xconn=0x55fc377a7be0) at ../../source3/smbd/smb2_server.c:4060
#23 smbd_smb2_connection_handler (ev=<optimized out>, fde=<optimized out>,
flags=<optimized out>, private_data=<optimized out>) at
../../source3/smbd/smb2_server.c:4098
#24 0x00007fc960afa70d in tevent_common_invoke_fd_handler
(fde=fde at entry=0x55fc377afaa0, flags=1, removed=removed at entry=0x0) at
../../tevent_fd.c:138
#25 0x00007fc960b00a77 in epoll_event_loop (tvalp=0x7ffedd752540,
epoll_ev=0x55fc37786ca0) at ../../tevent_epoll.c:736
#26 epoll_event_loop_once (ev=<optimized out>, location=<optimized out>) at
../../tevent_epoll.c:937
#27 0x00007fc960afec07 in std_event_loop_once (ev=0x55fc3776f380,
location=0x7fc961645c40 "../../source3/smbd/process.c:4170") at
../../tevent_standard.c:110
#28 0x00007fc960af9df4 in _tevent_loop_once (ev=ev at entry=0x55fc3776f380,
location=location at entry=0x7fc961645c40 "../../source3/smbd/process.c:4170") at
../../tevent.c:772
#29 0x00007fc960afa09b in tevent_common_loop_wait (ev=0x55fc3776f380,
location=0x7fc961645c40 "../../source3/smbd/process.c:4170") at
../../tevent.c:895
#30 0x00007fc960afeba7 in std_event_loop_wait (ev=0x55fc3776f380,
location=0x7fc961645c40 "../../source3/smbd/process.c:4170") at
../../tevent_standard.c:141
#31 0x00007fc961535687 in smbd_process (ev_ctx=0x55fc3776f380,
msg_ctx=<optimized out>, sock_fd=<optimized out>, interactive=<optimized out>)
at ../../source3/smbd/process.c:4170
#32 0x000055fc367ecd51 in smbd_accept_connection (ev=0x55fc3776f380,
fde=<optimized out>, flags=<optimized out>, private_data=<optimized out>) at
../../source3/smbd/server.c:1012
#33 0x00007fc960afa70d in tevent_common_invoke_fd_handler
(fde=fde at entry=0x55fc377b0180, flags=1, removed=removed at entry=0x0) at
../../tevent_fd.c:138
#34 0x00007fc960b00a77 in epoll_event_loop (tvalp=0x7ffedd7527c0,
epoll_ev=0x55fc37786b00) at ../../tevent_epoll.c:736
#35 epoll_event_loop_once (ev=<optimized out>, location=<optimized out>) at
../../tevent_epoll.c:937
#36 0x00007fc960afec07 in std_event_loop_once (ev=0x55fc3776f380,
location=0x55fc367f2f18 "../../source3/smbd/server.c:1359") at
../../tevent_standard.c:110
#37 0x00007fc960af9df4 in _tevent_loop_once (ev=ev at entry=0x55fc3776f380,
location=location at entry=0x55fc367f2f18 "../../source3/smbd/server.c:1359") at
../../tevent.c:772
#38 0x00007fc960afa09b in tevent_common_loop_wait (ev=0x55fc3776f380,
location=0x55fc367f2f18 "../../source3/smbd/server.c:1359") at
../../tevent.c:895
#39 0x00007fc960afeba7 in std_event_loop_wait (ev=0x55fc3776f380,
location=0x55fc367f2f18 "../../source3/smbd/server.c:1359") at
../../tevent_standard.c:141
#40 0x000055fc367e8aff in smbd_parent_loop (parent=0x55fc377896c0,
ev_ctx=0x55fc3776f380) at ../../source3/smbd/server.c:1359
#41 main (argc=<optimized out>, argv=<optimized out>) at
../../source3/smbd/server.c:2197

Thanks in advance!

Cheers,
Josep M. Perez




-- Package-specific info:
* /etc/samba/smb.conf present, and attached
* /var/lib/samba/dhcp.conf present, and attached

-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.7.0-2-amd64 (SMP w/12 CPU threads)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages samba depends on:
ii  adduser              3.118
ii  dpkg                 1.20.5
ii  init-system-helpers  1.58
ii  libbsd0              0.10.0-1
ii  libc6                2.31-3
ii  libgnutls30          3.6.14-2+b1
ii  libldb2              2:2.1.4-2
ii  libpam-modules       1.3.1-5
ii  libpam-runtime       1.3.1-5
ii  libpopt0             1.18-1
ii  libpython3.8         3.8.5-2
ii  libtalloc2           2.3.1-1
ii  libtasn1-6           4.16.0-2
ii  libtdb1              1.4.3-1
ii  libtevent0           0.10.2-1
ii  libwbclient0         2:4.12.5+dfsg-3
ii  lsb-base             11.1.0
ii  procps               2:3.3.16-5
ii  python3              3.8.2-3
ii  python3-dnspython    1.16.0-2
ii  python3-samba        2:4.12.5+dfsg-3
ii  samba-common         2:4.12.5+dfsg-3
ii  samba-common-bin     2:4.12.5+dfsg-3
ii  samba-libs           2:4.12.5+dfsg-3
ii  tdb-tools            1.4.3-1

Versions of packages samba recommends:
ii  attr                1:2.4.48-5
ii  logrotate           3.16.0-3
ii  python3-markdown    3.2.2-2
ii  samba-dsdb-modules  2:4.12.5+dfsg-3
ii  samba-vfs-modules   2:4.12.5+dfsg-3

Versions of packages samba suggests:
ii  bind9                     1:9.16.4-1+b1
ii  bind9-utils [bind9utils]  1:9.16.4-1+b1
ii  bind9utils                1:9.16.4-1
pn  ctdb                      <none>
pn  ldb-tools                 <none>
pn  ntp | chrony              <none>
ii  smbldap-tools             0.9.11-1
pn  ufw                       <none>
pn  winbind                   <none>

-- no debconf information
-------------- next part --------------
#
# Sample configuration file for the Samba suite for Debian GNU/Linux.
#
#
# This is the main Samba configuration file. You should read the
# smb.conf(5) manual page in order to understand the options listed
# here. Samba has a huge number of configurable options most of which 
# are not shown in this example
#
# Some options that are often worth tuning have been included as
# commented-out examples in this file.
#  - When such options are commented with ";", the proposed setting
#    differs from the default Samba behaviour
#  - When commented with "#", the proposed setting is the default
#    behaviour of Samba but the option is considered important
#    enough to be mentioned here
#
# NOTE: Whenever you modify this file you should run the command
# "testparm" to check that you have not made any basic syntactic 
# errors. 

#======================= Global Settings =======================

[global]

strict allocate = yes


## Browsing/Identification ###

# Change this to the workgroup/NT-domain name your Samba server will part of
#   workgroup = WORKGROUP
   workgroup = LOCAL

# Windows Internet Name Serving Support Section:
# WINS Support - Tells the NMBD component of Samba to enable its WINS Server
#   wins support = no

# WINS Server - Tells the NMBD components of Samba to be a WINS Client
# Note: Samba can be either a WINS Server, or a WINS Client, but NOT both
;   wins server = w.x.y.z

# If we receive WINS server info from DHCP, override the options above. 
   include = /var/lib/samba/dhcp.conf

# This will prevent nmbd to search for NetBIOS names through DNS.
   dns proxy = no

#### 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
;   interfaces = 127.0.0.0/8 enp2s0 
;   interfaces = 127.0.0.0/8 bond0
   interfaces = 127.0.0.0/8 enp1s0 enp2s0

# 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

# If you want Samba to only log through syslog then set the following
# parameter to 'yes'.
#   syslog only = no

# We want Samba to log a minimum amount of information to syslog. Everything
# should go to /var/log/samba/log.{smbd,nmbd} instead. If you want to log
# through syslog you should set the following parameter to something higher.
#   syslog = 0

# Do something sensible when Samba crashes: mail the admin a backtrace
   panic action = /usr/share/samba/panic-action %d



   logging = file systemd
   log level = 1 auth_audit:2



####### 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

# If you are using encrypted passwords, Samba will need to know what
# password database type you are using.  
   passdb backend = tdbsam

   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 at informatik.tu-muenchen.de> 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 = primary
# classic domain controller', 'server role = 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 uid = 10000-20000
;   idmap gid = 10000-20000
;   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 (default) 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
   usershare allow guests = no



#   fruit:aapl = yes
#   fruit:time machine = yes

   durable handles = yes
#   durable handles = no
   kernel oplocks = no
   kernel share modes = no
   posix locking = no

#   oplocks = no
   oplocks = yes
#   level2 oplocks = no


   #vfs objects = fruit streams_xattr recycle
#   vfs objects = fruit streams_xattr acl_xattr
#   vfs objects = catia fruit streams_xattr acl_xattr aio_pthread
   vfs objects = fruit streams_xattr acl_xattr readahead aio_pthread
   map acl inherit = yes
   store dos attributes = yes
   aio_pthread:aio open = yes

#   aio read size = 1
#   aio write size = 1

#   recycle:repository = .recycle
#   recycle:keeptree = yes
#   recycle:versions = yes
#   recycle:touch = yes
#   recycle:touch_mtime = yes

   sync always = no
   strict sync = no
   
   server multi channel support = yes
   load printers = no
   disable spoolss = yes
   show add printer wizard = no
   disable netbios = yes
   dns proxy = no
   deadtime = 1800
#   smb encrypt = off
#   socket options = TCP_NODELAY IPTOS_LOWDELAY IPTOS_THROUGHPUT SO_RCVBUF=131072 SO_SNDBUF=131072 SO_KEEPALIVE
#   min receivefile size = 16384
#   use sendfile = yes
#   write cache size = 262144
#   strict locking = no
#   aio read size = 16384
#   aio write size = 16384



   allow insecure wide links = yes




#======================= Share Definitions =======================

[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
   read only = no

# 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.
# The following parameter makes sure that only "username" can connect
# to \\server\username
# This might need tweaking when using external authentication schemes
   valid users = %S

   follow symlinks = yes
   wide links = yes




[TimeMachine]
	comment = Time Machine
	path = /home/mini2-timemachine/TimeMachine
	browseable = yes
	read only = no
	create mask = 0700
	directory mask = 0700
	valid users = mini2-timemachine
	spotlight = yes

#	vfs objects = fruit streams_xattr acl_xattr catia
	vfs objects = fruit streams_xattr acl_xattr catia aio_pthread
	fruit:aapl = yes
	fruit:time machine = yes

# 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
   browseable = yes
   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

-------------- next part --------------
   wins server =enp2s0:192.168.2.1


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