[arch-general] PAM/crond crashes with glibc 2.21-1

[Troy Engel]

On Sun, Feb 8, 2015 at 8:43 AM, Genes Lists <lists at sapience.com> wrote:
>
> crond[952]: PAM unable to dlopen(/usr/lib/security/pam_unix.so):
> /usr/lib/libpthread.so.0: symbol __getrlimit, version GLIBC_PRIVATE not
> defined in file libc.so.6 with link time reference

Exact hit on that error: https://bugzilla.redhat.com/show_bug.cgi?id=113000

I think the error is saying "I found a libc.so.6 but it's not the one
you think", try using ldd:

 $ ldd /usr/lib/security/pam_unix.so | grep pthread
    libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007f197cda9000)

 $ ldd /usr/lib/libpthread.so.0 | grep libc
    libc.so.6 => /usr/lib/libc.so.6 (0x00007ffa27666000)

I notice that mine is linked like so -- does yours link to the
expected lib*-2.21.so ?

 $ ls -l /usr/lib/lib{pthread.so.0,c.so.6}
 lrwxrwxrwx 1 root root 12 Dec 26 20:13 /usr/lib/libc.so.6 -> libc-2.20.so
 lrwxrwxrwx 1 root root 18 Dec 26 20:13 /usr/lib/libpthread.so.0 ->
libpthread-2.20.so

Maybe another symlink isn't linked correctly (one of their deps); I
cooked up this one-liner you could try and use to find a symlink that
maybe isn't going where it's supposed to?

 $ pacman -Ql glibc | egrep "usr/lib/(.*).so" | awk '{print $2}' |
xargs ls -l | grep '\->'

Here's a pastebin of the glibc-2.20 on my system for reference:
http://pastebin.com/wfgzccaZ

hth,
-te