[Bug 1332203] [NEW] autofs5-ldap regularly crashes after long periods of time

[Paul Kilgo]

Public bug reported:

Over the past few months we noticed our web server would no longer serve
requests out of directories normally mounted by autofs, which is
configured to be backed by LDAP. We knew a reboot would fix the problem
temporarily but it would recur after several weeks. We just discovered
the problem in the logs:

Jun 19 04:59:07 www1 kernel: [732120.739266] do_general_protection: 9 callbacks suppressed
Jun 19 04:59:07 www1 kernel: [732120.739272] automount[5810] general protection ip:7f9816a663b1 sp:7f9809fab760 error:0 in libc-2.15.so[7f9816a1b000+1b5000]
Jun 19 04:59:10 www1 kernel: [732123.235552] init: autofs main process (931) killed by SEGV signal
Jun 19 04:59:10 www1 kernel: [732123.235602] init: autofs main process ended, respawning

After the crash, autofs does not respond to restarts via the init
scripts. It may after cleaning up the appropriate pid files and such,
but I'm not sure what those are.

I examined the .crash file and from a backtrace I assume it must be
something wrong with the LDAP portion of autofs:

$> apport-retrace -g automount.crash 
GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04
...<snip>...
Reading symbols from /usr/sbin/automount...(no debugging symbols found)...done.
[New LWP 5810]
...<snip>...
warning: Can't read pathname for load map: Input/output error.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/sbin/automount -DNFS=fstype=nfs4,rsize=32768,wsize=32768 -DNFSv3=fstype=nf'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007f9816a663b1 in _IO_vfprintf_internal (s=<optimized out>, format=<optimized out>, ap=<optimized out>) at vfprintf.c:1630
1630	vfprintf.c: No such file or directory.
(gdb) bt
#0  0x00007f9816a663b1 in _IO_vfprintf_internal (s=<optimized out>, format=<optimized out>, ap=<optimized out>) at vfprintf.c:1630
#1  0x00007f9816a691a4 in buffered_vfprintf (s=0x7f9816dd5180, format=<optimized out>, args=<optimized out>) at vfprintf.c:2313
#2  0x00007f9816a63bde in _IO_vfprintf_internal (s=0x7f9816dd5180, format=0x7f9815af9ab8 "%s: lookup(ldap): query failed for search dn %s: %s", ap=0x7f9809fae5b8)
    at vfprintf.c:1316
#3  0x00007f9816b24b08 in ___vfprintf_chk (fp=0x7f9816dd5180, flag=1, format=<optimized out>, ap=<optimized out>) at vfprintf_chk.c:35
#4  0x00007f9815af0996 in log_error () from /usr/lib/autofs/lookup_ldap.so
#5  0x00007f9815ae6276 in ?? () from /usr/lib/autofs/lookup_ldap.so
#6  0x00007f9815ae7141 in ?? () from /usr/lib/autofs/lookup_ldap.so
#7  0x00007f9815ae73fe in ?? () from /usr/lib/autofs/lookup_ldap.so
#8  0x00007f9815ae77eb in ?? () from /usr/lib/autofs/lookup_ldap.so
#9  0x00007f9815aea641 in lookup_mount () from /usr/lib/autofs/lookup_ldap.so
#10 0x00007f98177935f5 in lookup_nss_mount ()
#11 0x00007f9817789c8f in ?? ()
#12 0x00007f981713ee9a in start_thread (arg=0x7f9809fb2700) at pthread_create.c:308
#13 0x00007f9816b0f3fd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#14 0x0000000000000000 in ?? ()

I've attached the .crash file. I'll note that I added the "Package:"
line myself to be able to use it with apport-retrace.

I'm still not sure what reproduces the bug if it's something in our LDAP
database or not. I was hoping maybe it's some small problem in
log_error() that maybe was meaning to tell me something that's wrong
with LDAP.

Versions:

Ubuntu: 12.04
autofs5: 5.0.6-0ubuntu5.1
autofs5-ldap: 5.0.6-0ubuntu5.1

** Affects: autofs5 (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "crash report"
   https://bugs.launchpad.net/bugs/1332203/+attachment/4135005/+files/automount.crash

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Title:
  autofs5-ldap regularly crashes after long periods of time

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