Do you have any crash dumps? If you look at Steam's system information it'll list available dumps and ones that have been sent to Valve. If you can include that section here we can look them up.
Also, do you have any selinux events? Steam uses code which dynamically generates executable instructions in ways that selinux doesn't like.
Now I remember how to reproduce this error, when I go "Games" -> "Free to Play" -> "Dota 2" it crashes every time.
There do not appear to be any SELinux events, but this is what I am getting under Recent Failure Report
Recent Failure Reports:
Sun Jul 28 04:59:56 2013 GMT: file ''/tmp/dumps/crash_20130728005932_1.dmp'', upload no: ''HTTP response code said error''
This happens more frequently then just that,
Processor Information:
Vendor: AuthenticAMD
Speed: 1600 Mhz
4 logical processors
4 physical processors
HyperThreading: Unsupported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSSE3: Unsupported
SSE4a: Supported
SSE41: Unsupported
SSE42: Unsupported
Network Information:
Network Speed:
Operating System Version:
"Fedora release 19 (Schrödinger’s Cat)" (64 bit)
Kernel Name: Linux
Kernel Version: 3.9.9-302.fc19.x86_64
X Server Vendor: Fedora Project
X Server Release: 11402000
X Window Manager: KWin
Steam Runtime Version: steam-runtime-release-i386_2013-06-28
Video Card:
Driver: X.Org Gallium 0.4 on AMD SUMO
Driver Version: 1.4 (3.0 Mesa 9.2.0-devel)
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 59 Hz
VendorID: 0x1002
DeviceID: 0x9641
Number of Monitors: 2
Number of Logical Video Cards: 1
Primary Display Resolution: 2560 x 1440
Desktop Resolution: 4480 x 1440
Primary Display Size: 23.50" x 13.23" (26.97" diag)
59.7cm x 33.6cm (68.5cm diag)
Primary VRAM Not Detected
Sound card:
Audio device: ATI R6xx HDMI
Memory:
RAM: 7461 Mb
Miscellaneous:
UI Language: English
LANG: en_US.UTF-8
Microphone: Not set
Total Hard Disk Space Available: 78516 Mb
Largest Free Hard Disk Block: 55198 Mb
Installed software:
Recent Failure Reports:
Sun Jul 28 04:59:56 2013 GMT: file ''/tmp/dumps/crash_20130728005932_1.dmp'', upload no: ''HTTP response code said error''
Sun Jul 28 05:02:47 2013 GMT: file ''/tmp/dumps/crash_20130728010006_1.dmp'', upload no: ''HTTP response code said error''
Sun Jul 28 05:06:32 2013 GMT: file ''/tmp/dumps/crash_20130728010534_1.dmp'', upload no: ''HTTP response code said error''
Sun Jul 28 05:06:57 2013 GMT: file ''/tmp/dumps/crash_20130728010642_1.dmp'', upload no: ''HTTP response code said error''
Sun Jul 28 05:07:50 2013 GMT: file ''/tmp/dumps/crash_20130728010712_1.dmp'', upload no: ''HTTP response code said error''
Nothing extracted yet.
It is worth noting I am running Fedora 19 and not a version of Ubuntu. I've included possibly useful information from the dump file.
vendor_id : AuthenticAMD
cpu family : 18
model : 1
model name : AMD A8-3520M APU with Radeon(tm) HD Graphics
stepping : 0
microcode : 0x3000027
cpu MHz : 800.000
cache size : 1024 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 6
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt arat cpb hw_pstate npt lbrv svm_lock nrip_save pausefilter
bogomips : 3193.99
TLB size : 1536 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate cpb
processor : 1
vendor_id : AuthenticAMD
cpu family : 18
model : 1
model name : AMD A8-3520M APU with Radeon(tm) HD Graphics
stepping : 0
microcode : 0x3000027
cpu MHz : 800.000
cache size : 1024 KB
physical id : 0
siblings : 4
core id : 1
cpu cores : 4
apicid : 1
initial apicid : 1
fpu : yes
fpu_exception : yes
cpuid level : 6
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt arat cpb hw_pstate npt lbrv svm_lock nrip_save pausefilter
bogomips : 3193.99
TLB size : 1536 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate cpb
processor : 2
vendor_id : AuthenticAMD
cpu family : 18
model : 1
model name : AMD A8-3520M APU with Radeon(tm) HD Graphics
stepping : 0
microcode : 0x3000027
cpu MHz : 1600.000
cache size : 1024 KB
physical id : 0
siblings : 4
core id : 2
cpu cores : 4
apicid : 2
initial apicid : 2
fpu : yes
fpu_exception : yes
cpuid level : 6
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt arat cpb hw_pstate npt lbrv svm_lock nrip_save pausefilter
bogomips : 3193.99
TLB size : 1536 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate cpb
processor : 3
vendor_id : AuthenticAMD
cpu family : 18
model : 1
model name : AMD A8-3520M APU with Radeon(tm) HD Graphics
stepping : 0
microcode : 0x3000027
cpu MHz : 800.000
cache size : 1024 KB
physical id : 0
siblings : 4
core id : 3
cpu cores : 4
apicid : 3
initial apicid : 3
fpu : yes
fpu_exception : yes
cpuid level : 6
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt arat cpb hw_pstate npt lbrv svm_lock nrip_save pausefilter
bogomips : 3193.99
TLB size : 1536 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate cpb