cron crashed with SIGSEGV in _init() after libc6/NSS upgrade

Binary package hint: cron

I noticed the kernel logging segfaults from cron:

[2680656.645816] cron[32527]: segfault at 0 ip (null) sp bff38bc8 error 4 in libnss_nis-2.10.1.so (deleted)[110000+9000]
[2684256.769888] cron[29034]: segfault at 0 ip (null) sp bff38bc8 error 4 in libnss_nis-2.10.1.so (deleted)[110000+9000]
[2687856.272284] cron[23399]: segfault at 0 ip (null) sp bff38bc8 error 4 in libnss_nis-2.10.1.so (deleted)[110000+9000]
[2691456.718460] cron[17825]: segfault at 0 ip (null) sp bff38bc8 error 4 in libnss_nis-2.10.1.so (deleted)[110000+9000]
[2695056.347722] cron[12598]: segfault at 0 ip (null) sp bff38bc8 error 4 in libnss_nis-2.10.1.so (deleted)[110000+9000]
[2698655.941056] cron[7216]: segfault at 0 ip (null) sp bff38bc8 error 4 in libnss_nis-2.10.1.so (deleted)[110000+9000]

these happened at regular intervals, each time cron.hourly was run (17 minutes past the hour). I was able to capture this one with apport.

As you can see, cron is using an obsolete libnss_nis which has been deleted and replaced with a newer one (ibnss_nis-2.10.2.so). I believe crashes like this are the reason why NSS-using daemons get restarted on incompatible NSS upgrades, but that didn't happen in this case (cron has been running since days before the upgrade on both systems).

ProblemType: Crash
Architecture: i386
Date: Fri Jan 8 11:17:02 2010
Disassembly: 0x0: Cannot access memory at address 0x0
DistroRelease: Ubuntu 10.04
ExecutablePath: /usr/sbin/cron
Package: cron 3.0pl1-106ubuntu3
ProcCmdline: CRON
ProcEnviron: PATH=(custom, no user)
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SegvAnalysis:
 Segfault happened at: 0x0: Cannot access memory at address 0x0
 PC (0x00000000) not located in a known VMA region (needed executable region)!
SegvReason: executing NULL VMA
Signal: 11
SourcePackage: cron
StacktraceTop:
 ?? ()
 _init () from /lib/tls/i686/cmov/libpthread.so.0
 ?? () from /lib/ld-linux.so.2
 ?? () from /lib/ld-linux.so.2
 ?? () from /lib/ld-linux.so.2
Tags: lucid
Title: cron crashed with SIGSEGV in _init()
Uname: Linux 2.6.31-14-generic i686
UserGroups: