Description of problem:
I see this bug every time when application try allocate huge amount memory.
So it is not a application problem. It is kernel or SELinux problem!
SELinux is preventing /usr/lib/opera/opera from 'mmap_zero' accesses on the memprotect .

*****  Plugin mmap_zero (53.1 confidence) suggests  **************************

If you do not think /usr/lib/opera/opera should need to mmap low memory in the kernel.
Then you may be under attack by a hacker, this is a very dangerous access.
Do
contact your security administrator and report this issue.

*****  Plugin catchall_boolean (42.6 confidence) suggests  *******************

If you want to control the ability to mmap a low area of the address space, as configured by /proc/sys/kernel/mmap_min_addr.
Then you must tell SELinux about this by enabling the 'mmap_low_allowed' boolean.
You can read 'unconfined_selinux' man page for more details.
Do
setsebool -P mmap_low_allowed 1

*****  Plugin catchall (5.76 confidence) suggests  ***************************

If you believe that opera should be allowed mmap_zero access on the  memprotect by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# grep opera /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Target Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Target Objects                 [ memprotect ]
Source                        opera
Source Path                   /usr/lib/opera/opera
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           opera-12.14-1737.i386
Target RPM Packages           
Policy RPM                    selinux-policy-3.11.1-76.fc18.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 3.7.6-201.fc18.i686.PAE #1 SMP Mon
                              Feb 4 16:05:44 UTC 2013 i686 i686
Alert Count                   688
First Seen                    2013-02-09 16:50:58 YEKT
Last Seen                     2013-02-09 16:56:14 YEKT
Local ID                      48b42a65-16d5-433a-9dea-64eca7711b98

Raw Audit Messages
type=AVC msg=audit(1360407374.499:296212): avc:  denied  { mmap_zero } for  pid=506 comm="opera" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=memprotect


type=SYSCALL msg=audit(1360407374.499:296212): arch=i386 syscall=mmap2 per=400000 success=no exit=EACCES a0=0 a1=954e4 a2=1 a3=1 items=0 ppid=1681 pid=506 auid=1000 uid=1000 gid=1000 euid=1000 suid=1000 fsuid=1000 egid=1000 sgid=1000 fsgid=1000 ses=2 tty=(none) comm=opera exe=/usr/lib/opera/opera subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)

Hash: opera,unconfined_t,unconfined_t,memprotect,mmap_zero

audit2allow

#============= unconfined_t ==============
#!!!! This avc can be allowed using the boolean 'mmap_low_allowed'

allow unconfined_t self:memprotect mmap_zero;

audit2allow -R

#============= unconfined_t ==============
#!!!! This avc can be allowed using the boolean 'mmap_low_allowed'

allow unconfined_t self:memprotect mmap_zero;


Additional info:
hashmarkername: setroubleshoot
kernel:         3.7.6-201.fc18.i686.PAE
type:           libreport