[Bug 1503034] Re: Autofs 5.1.1-1ubuntu2 crashes with segfault on startup

[Mathew Hodson]

** Description changed:

  I'm running Wily Beta 2, updated to the latest packages in the wily
  repository, with autofs-ldap using mounts stored in LDAP. On startup
  systemd immediately puts autofs into a failed state as it segfaults when
  reading the auto.master.
  
  Autofs & autofs-ldap version is 5.1.1-1ubuntu2.
+ 
+ [Impact]
+ 
+ This bug prevents the autofs-ldap module from loading, and causes it to
+ segfault on startup. The proposed fix allows the module to load
+ normally. The fix initialises configuration cache before it is first
+ used (it is the access to the uninitialised cache which causes the
+ segfault).
+ 
+ [Test Case]
+ 
+ Install the autofs-ldap package and have it read an automount map from
+ LDAP. The necessary auto.master & ldap.conf configuration is dependent
+ on the LDAP server that provides the automount maps.
+ 
+ [Regression Potential]
+ 
+ Given the shipped package does not load at all, it can't be a regression
+ on the shipped binary.
+ 
+ [Other Info]
  
  The log in journalctl looks like this:
  
  Oct 05 15:47:45 <hostname> autofs[2232]: * Starting automount...
  Oct 05 15:47:45 <hostname> automount[2240]: Starting automounter version 5.1.1, master map /etc/auto.master
  Oct 05 15:47:45 <hostname> automount[2240]: using kernel protocol version 5.02
  Oct 05 15:47:45 <hostname> automount[2240]: lookup_nss_read_master: reading master file /etc/auto.master
  Oct 05 15:47:45 <hostname> automount[2240]: parse_init: parse(sun): init gathered global options: (null)
  Oct 05 15:47:45 <hostname> automount[2240]: spawn_mount: mtab link detected, passing -n to mount
  Oct 05 15:47:45 <hostname> automount[2240]: spawn_umount: mtab link detected, passing -n to mount
  Oct 05 15:47:45 <hostname> automount[2240]: lookup_read_master: lookup(file): read entry /net
  Oct 05 15:47:45 <hostname> automount[2240]: lookup_read_master: lookup(file): read entry +dir:/etc/auto.master.d
  Oct 05 15:47:45 <hostname> automount[2240]: lookup_nss_read_master: reading master dir /etc/auto.master.d
  Oct 05 15:47:45 <hostname> automount[2240]: lookup(dir): dir map /etc/auto.master.d missing or not readable
  Oct 05 15:47:45 <hostname> automount[2240]: lookup(file): failed to read included master map dir:/etc/auto.master.d
  Oct 05 15:47:45 <hostname> automount[2240]: lookup_read_master: lookup(file): read entry +auto.master
  Oct 05 15:47:45 <hostname> automount[2240]: lookup_nss_read_master: reading master files auto.master
  Oct 05 15:47:45 <hostname> automount[2240]: parse_init: parse(sun): init gathered global options: (null)
  Oct 05 15:47:45 <hostname> automount[2240]: lookup_nss_read_master: reading master ldap auto.master
  Oct 05 15:47:45 <hostname> kernel: automount[2240]: segfault at 0 ip 00007fb87ade5bcb sp 00007ffc30b34550 error 4 in lookup_ldap.so[7fb87adca000+38000]
  Oct 05 15:47:47 <hostname> autofs[2232]: ...fail!
  Oct 05 15:47:47 <hostname> systemd[1]: autofs.service: Control process exited, code=exited status=1
  
  This occurs whenever the service is started with the line in auto.master
  which loads the ldap mounts. The line which causes the issue is
  "+ldap:automountMapName=auto.master.linux,ou=automount,ou=<location>,ou=<group>,o=<group>,dc=<base>,dc=com",
  and this configuration worked on 14.04, 14.10 and 15.04.
- 
- [Impact] This bug prevents the autofs-ldap module from loading, and
- causes it to segfault on startup. The proposed fix allows the module to
- load normally. The fix initialises configuration cache before it is
- first used (it is the access to the uninitialised cache which causes the
- segfault).
- 
- [Test Case] Install the autofs-ldap package and have it read an
- automount map from LDAP. The necessary auto.master & ldap.conf
- configuration is dependent on the LDAP server that provides the
- automount maps.
- 
- [Regression Potential] Given the shipped package does not load at all,
- it can't be a regression on the shipped binary.

** Changed in: autofs (Ubuntu Wily)
       Status: Confirmed => Triaged

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https://bugs.launchpad.net/bugs/1503034

Title:
  Autofs 5.1.1-1ubuntu2 crashes with segfault on startup

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