[Bug 1585614] Re: PHP Update on 2016-05-25 causes Apache not to restart, libm.so.6: symbol __strtold_nan, version GLIBC_PRIVATE not defined in file libc.so.6 with link time reference

[BrandonTomlinson]

We had around 60 12.04 servers impacted today, no 14.04 or newer web
servers.

Specifically it looks like an update race condition where libapache2
-mod-php (which restarts/reloads apache) is updated before the  libc6
package.

We could prove this theory by doing 'apt-get install libc6 && apt-get
update' to see, but I don't have the ability to test this myself.

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Title:
  PHP Update on 2016-05-25 causes Apache not to restart, libm.so.6:
  symbol __strtold_nan, version GLIBC_PRIVATE not defined in file
  libc.so.6 with link time reference

Status in eglibc package in Ubuntu:
  Confirmed

Bug description:
  This morning I applied the following updates to Ubuntu 12.04
  webservers:

  The following packages are currently pending an upgrade:

   apt 0.8.16~exp12ubuntu10.27
   apt-transport-https 0.8.16~exp12ubuntu10.27
   apt-utils 0.8.16~exp12ubuntu10.27
   libapache2-mod-php5 5.3.10-1ubuntu3.23
   libapt-inst1.4 0.8.16~exp12ubuntu10.27
   libapt-pkg4.12 0.8.16~exp12ubuntu10.27
   php5-cli 5.3.10-1ubuntu3.23
   php5-common 5.3.10-1ubuntu3.23
   php5-curl 5.3.10-1ubuntu3.23
   php5-dev 5.3.10-1ubuntu3.23
   php5-gd 5.3.10-1ubuntu3.23
   php5-mysql 5.3.10-1ubuntu3.23
   php-pear 5.3.10-1ubuntu3.23

  Apache fails to restart, siting error:

  apache2: Syntax error on line 212 of /etc/apache2/apache2.conf: Syntax
  error on line 1 of /etc/apache2/mods-enabled/php5.load: Cannot load
  /usr/lib/apache2/modules/libphp5.so into server: /lib/x86_64-linux-
  gnu/libm.so.6: symbol __strtold_nan, version GLIBC_PRIVATE not defined
  in file libc.so.6 with link time reference

  Into file /var/log/apache2/error.log

  Looks like I am trying to roll back all those php packages... Which I
  see several updates marked Security Update in the changelogs, thus
  checking the "security vulnerability" box as rolling back in this case
  is such. :-(

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