PHP crashes on F21 with roundcube

[Reindl Harald]

am i the only one facing reproduceable crashes of apache worker process 
each time a roundcube 1.0.5 page is loaded? all relevant packages 
(apache, php..) here are built from identical srpms andthe only 
difference is the Fedora 21 userland and a newer GCC

that affects the same way PHP 5.5 as PHP 5.6

[Mon Apr 27 11:09:23.113259 2015] [core:notice] [pid 118704] AH00052: 
child pid 118706 exit signal Segmentation fault (11)

open("/dev/urandom", O_RDONLY)          = 13
read(13, 
"\200\376%\23\240\236\n9\373\210\243%i\223\367J\210\271\177\26\207\331\177\r\372RB\342\2223\352="..., 
64) = 64
close(13)                               = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x7fcf70b39000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x7fcf70b37000
munmap(0x7fcf70b37000, 8192)            = 0
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x8} ---
chdir("/etc/httpd")                     = 0
rt_sigaction(SIGSEGV, {SIG_DFL, [], SA_RESTORER|SA_INTERRUPT, 
0x7fcf754c70d0}, {SIG_DFL, [], SA_RESTORER|SA_RESETHAND, 
0x7fcf754c70d0}, 8) = 0
kill(118706, SIGSEGV)                   = 0
rt_sigreturn({mask=[]})                 = 32
--- SIGSEGV {si_signo=SIGSEGV, si_code=SI_USER, si_pid=118706, 
si_uid=48} ---
+++ killed by SIGSEGV +++

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