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is this bug still (or again?) present in Debian Squeeze?
I think I hit this problem multiple times during last week, getting
hostname:/# strace -p 22854
Process 22854 attached - interrupt to quit
futex(0x7f1dc6f96550, FUTEX_WAIT_PRIVATE, 2, NULL^C <unfinished ...>
Process 22854 detached
After finding this bugreport I disabled ipv6 on the server which seems
to fix the issue.
List of enabled modules from 'apache2 -M':
alias auth_basic auth_pam auth_sys_group authn_file authz_default
authz_groupfile authz_host authz_user autoindex deflate dir env
macro mime php5 rewrite setenvif status
List of enabled php5 extensions:
curl gd mcrypt mysql mysqli pdo pdo_mysql suhosin