[php-maint] Bug#755219: php5: Roundcube fails after upgrading to 5.6.0~rc2+dfsg-3

[Bernhard Schmidt]

Package: php5
Version: 5.6.0~rc2+dfsg-3
Severity: important

Dear Maintainer,

I have a hard time properly describing the problem.

I run a standard webserver on Jessie with Apache2, mod-proxy-fcgi, php5-fpm.

The Roundcube webmail system (both the 0.9.5 packaged with Debian and
1.0.1 from upstream) breaks when PHP is upgraded from 5.6.0~rc2+dfsg-1
to 5.6.0~rc2+dfsg-3.
The error is very dubious, there are no errors in any log, the server
just returns 403 on some requests (the AJAX-like polls). The effect is
that you can login, but the browser displays a "Server error" in a
message box in a loop and the message list is not displayed.

I tried upgrading to 5.6.0~rc2+dfsg-4, but that doesn't fix it.
Downgrading to -1 does, upgrading to -3 breaks it again.

Without any traces in the logs I don't have any idea where to look. Can
you give me any hints where to look?

-- System Information:
Debian Release: jessie/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 3.14-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages php5 depends on:
ii  php5-cgi     5.6.0~rc2+dfsg-3
ii  php5-common  5.6.0~rc2+dfsg-3
ii  php5-fpm     5.6.0~rc2+dfsg-3

php5 recommends no packages.

php5 suggests no packages.

-- no debconf information