Faced a similar issue with the newest version of nscd. Users in
netgroups would be able to use sudo one time. Once authed the nscd
process would die for all users. `/etc/init.d/nscd status` showed it
was not running
> /etc/init.d/nscd status
* Status of Name Service Cache Daemon service:
* not running.
syslog showed the following
May 22 11:46:31 default kernel: [84228.494446] nscd[28565]: segfault at 0 ip
00007f3400ed03e1 sp 00007f33f7d2f108 error 4 in
libc-2.15.so[7f3400d6f000+1b3000]
May 22 11:53:18 default nscd: 29514 cannot stat() file `/etc/netgroup': No such
file or directory
May 22 11:53:29 default nscd: 29558 cannot stat() file `/etc/netgroup': No such
file or directory
May 22 11:55:19 default nscd: 29991 cannot stat() file `/etc/netgroup': No such
file or directory
May 22 12:01:38 default nscd: 30481 cannot stat() file `/etc/netgroup': No such
file or directory
May 22 12:02:03 default kernel: [85160.598268] nscd[30489]: segfault at 0 ip
00007f794433a3e1 sp 00007f793af98108 error 4 in
libc-2.15.so[7f79441d9000+1b3000]
May 22 12:09:42 default nscd: 31130 cannot stat() file `/etc/netgroup': No such
file or directory
May 22 12:09:50 default kernel: [85627.475382] nscd[31140]: segfault at 0 ip
00007f57b81ef3e1 sp 00007f57aea4b108 error 4 in
libc-2.15.so[7f57b808e000+1b3000]
May 22 12:17:01 default CRON[31512]: (root) CMD ( cd / && run-parts --report
/etc/cron.hourly)
May 22 12:20:39 default kernel: [86276.573029] nscd[31569]: segfault at 0 ip
00007f0a8626b3e1 sp 00007f0a7cac7108 error 4 in
libc-2.15.so[7f0a8610a000+1b3000]
To resolve I removed the following from the bottom on /etc/nscd.conf
enable-cache netgroup yes
positive-time-to-live netgroup 28800
negative-time-to-live netgroup 20
suggested-size netgroup 211
check-files netgroup yes
persistent netgroup yes
shared netgroup yes
max-db-size netgroup 33554432
Just removing these stopped the slow authentication time and more
importantly stopped the segfaults. Users in netgroups can now use sudo
and auth as many times as they like. There is still a bug to fix here.
Hopefully this workaround can help some until patched.
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https://bugs.launchpad.net/bugs/997096
Title:
nscd segmentation fault
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