Having the same issue seems to only happen after sitting at the screen saver for some time.
MBP late 2011
Process: killall [42752]
Path: /usr/bin/killall
Identifier: killall
Version: 170
Code Type: X86-64 (Native)
Parent Process: launchd [1]
User ID: 501
Date/Time: 2012-07-27 09:01:03.654 -0500
OS Version: Mac OS X 10.8 (12A269)
Report Version: 10
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x0000000000000000
Application Specific Information:
Data corruption: Could not retain bootstrap port!
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libxpc.dylib 0x00007fff8c5435d3 _xpc_domain_create + 222
1 libxpc.dylib 0x00007fff8c542e72 _libxpc_initializer + 400
2 libSystem.B.dylib 0x00007fff92abdb2d libSystem_initializer + 172
3 dyld 0x00007fff679ef378 ImageLoaderMachO::doModInitFunctions(ImageLoader::LinkContext const&) + 236
4 dyld 0x00007fff679ef762 ImageLoaderMachO::doInitialization(ImageLoader::LinkContext const&) + 46
5 dyld 0x00007fff679ec06e ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int, ImageLoader::InitializerTimingList&) + 380
6 dyld 0x00007fff679ebfc4 ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int, ImageLoader::InitializerTimingList&) + 210
7 dyld 0x00007fff679ebeba ImageLoader::runInitializers(ImageLoader::LinkContext const&, ImageLoader::InitializerTimingList&) + 54
8 dyld 0x00007fff679ddfc0 dyld::initializeMainExecutable() + 207
9 dyld 0x00007fff679e1b04 dyld::_main(macho_header const*, unsigned long, int, char const**, char const**, char const**, unsigned long*) + 3060
10 dyld 0x00007fff679dd397 dyldbootstrap::start(macho_header const*, int, char const**, long, macho_header const*, unsigned long*) + 761
11 dyld 0x00007fff679dd05e _dyld_start + 54
Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x00007fff8c557af1 rbx: 0x00007fdf99c034a0 rcx: 0x00007fff888be61a rdx: 0x0000000000000000
rdi: 0x0000000000000907 rsi: 0x0000000000000507 rbp: 0x00007fff57e23030 rsp: 0x00007fff57e23020
r8: 0x0000000000000107 r9: 0x0000000000000000 r10: 0x0000000000000001 r11: 0x0000000000000246
r12: 0x00007fdf99c02ff0 r13: 0x0000000000000001 r14: 0x00007fff57e23d20 r15: 0x00007fff57e230e0
rip: 0x00007fff8c5435d3 rfl: 0x0000000000010206 cr2: 0x00007fdf99c03000
Logical CPU: 2
Binary Images:
0x107ddc000 - 0x107dddfff killall (170) <7609C509-2A5C-3DFD-A307-EEDF7551566B> /usr/bin/killall
0x7fff679dc000 - 0x7fff67a1093f dyld (210.2.3) <A40597AA-5529-3337-8C09-D8A014EB1578> /usr/lib/dyld
0x7fff86cd9000 - 0x7fff86cdaff7 libremovefile.dylib (23.1) <DBBFAF35-AC78-3856-92F6-6E4FD9DF14A2> /usr/lib/system/libremovefile.dylib
0x7fff871f4000 - 0x7fff87218ff7 libc++abi.dylib (24.2) <340E7C7B-DC93-3AA2-B015-B1C9541EC255> /usr/lib/libc++abi.dylib
0x7fff87282000 - 0x7fff87287fff libcompiler_rt.dylib (30) <08F8731D-5961-39F1-AD00-4590321D24A9> /usr/lib/system/libcompiler_rt.dylib
0x7fff874f1000 - 0x7fff8753dff7 libauto.dylib (185.1) <73CDC482-16E3-3FC7-9BB4-FBA2DA44DBC2> /usr/lib/libauto.dylib
0x7fff87772000 - 0x7fff87773ff7 libdnsinfo.dylib (453.16) <38A3E0F4-E34C-3D45-A2C9-4CDE2DF007BD> /usr/lib/system/libdnsinfo.dylib
0x7fff87774000 - 0x7fff87774fff libkeymgr.dylib (25) <CC9E3394-BE16-397F-926B-E579B60EE429> /usr/lib/system/libkeymgr.dylib
0x7fff888ae000 - 0x7fff888c9ff7 libsystem_kernel.dylib (2050.7.9) <E0447BF5-E104-35B0-B28B-4156887D58F1> /usr/lib/system/libsystem_kernel.dylib
0x7fff8a959000 - 0x7fff8a96eff7 libdispatch.dylib (228.18) <0B6B6E7F-4D8A-3F3B-A4BF-6CF34638DBBB> /usr/lib/system/libdispatch.dylib
0x7fff8bc1c000 - 0x7fff8bc4aff7 libsystem_m.dylib (3022.6) <B434BE5C-25AB-3EBD-BAA7-5304B34E3441> /usr/lib/system/libsystem_m.dylib
0x7fff8c53e000 - 0x7fff8c560ff7 libxpc.dylib (140.37) <C552985C-2171-3136-A1B9-3AB21CBF7C4A> /usr/lib/system/libxpc.dylib
0x7fff8d140000 - 0x7fff8d147fff libcopyfile.dylib (89) <876573D0-E907-3566-A108-577EAD1B6182> /usr/lib/system/libcopyfile.dylib
0x7fff8d1c5000 - 0x7fff8d291fef libsystem_c.dylib (825.24) <16B6B86C-53EE-36E8-AC2B-4AADC1008098> /usr/lib/system/libsystem_c.dylib
0x7fff8d7fd000 - 0x7fff8d803fff libmacho.dylib (829) <BF332AD9-E89F-387E-92A4-6E1AB74BD4D9> /usr/lib/system/libmacho.dylib
0x7fff8e74a000 - 0x7fff8e752ff7 libsystem_dnssd.dylib (379.27) <057906EA-206E-3C35-B43F-5D936FD0A84F> /usr/lib/system/libsystem_dnssd.dylib
0x7fff8ebe2000 - 0x7fff8ebf0ff7 libsystem_network.dylib (77.10) <0D99F24E-56FE-380F-B81B-4A4C630EE587> /usr/lib/system/libsystem_network.dylib
0x7fff8faa6000 - 0x7fff8fab1fff libsystem_notify.dylib (98.5) <C49275CC-835A-3207-AFBA-8C01374927B6> /usr/lib/system/libsystem_notify.dylib
0x7fff9002b000 - 0x7fff90039fff libcommonCrypto.dylib (60026) <2D6537F5-1B5E-305C-A1CF-D1FA80CA3939> /usr/lib/system/libcommonCrypto.dylib
0x7fff9039c000 - 0x7fff903a2ff7 libunwind.dylib (35.1) <21703D36-2DAB-3D8B-8442-EAAB23C060D3> /usr/lib/system/libunwind.dylib
0x7fff90f79000 - 0x7fff90f7efff libcache.dylib (57) <65187C6E-3FBF-3EB8-A1AA-389445E2984D> /usr/lib/system/libcache.dylib
0x7fff90f7f000 - 0x7fff91097a27 libobjc.A.dylib (532) <9FA80CDA-97F4-3801-8879-0C1B976BC5CA> /usr/lib/libobjc.A.dylib
0x7fff91548000 - 0x7fff91597ff7 libcorecrypto.dylib (106) <57BC99C6-3C3F-344C-BDD6-25E845D956F2> /usr/lib/system/libcorecrypto.dylib
0x7fff91ac1000 - 0x7fff91ac4ff7 libdyld.dylib (210.2.3) <F59367C9-C110-382B-A695-9035A6DD387E> /usr/lib/system/libdyld.dylib
0x7fff91e2d000 - 0x7fff91e95ff7 libc++.1.dylib (65.1) <20E31B90-19B9-3C2A-A9EB-474E08F9FE05> /usr/lib/libc++.1.dylib
0x7fff92a83000 - 0x7fff92a84fff libsystem_blocks.dylib (59) <D92DCBC3-541C-37BD-AADE-ACC75A0C59C8> /usr/lib/system/libsystem_blocks.dylib
0x7fff92a85000 - 0x7fff92abbfff libsystem_info.dylib (406.17) <4FFCA242-7F04-365F-87A6-D4EFB89503C1> /usr/lib/system/libsystem_info.dylib
0x7fff92abc000 - 0x7fff92abdff7 libSystem.B.dylib (169.3) <365477AB-D641-389D-B8F4-A1FAE9657EEE> /usr/lib/libSystem.B.dylib
0x7fff92b17000 - 0x7fff92b19fff libquarantine.dylib (52) <4BE2E642-A14F-340A-B482-5BD2AEFD9C24> /usr/lib/system/libquarantine.dylib
0x7fff92d0a000 - 0x7fff92d12fff liblaunch.dylib (442.21) <224CB010-6CF8-3FC2-885C-6F80330321EB> /usr/lib/system/liblaunch.dylib
0x7fff92ee6000 - 0x7fff92ee7ff7 libsystem_sandbox.dylib (220) <3C3B03CF-C525-3CB3-8557-62E91B93AC95> /usr/lib/system/libsystem_sandbox.dylib
0x7fff92ee8000 - 0x7fff92eeaff7 libunc.dylib (25) <92805328-CD36-34FF-9436-571AB0485072> /usr/lib/system/libunc.dylib
External Modification Summary:
Calls made by other processes targeting this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by all processes on this machine:
task_for_pid: 46371
thread_create: 0
thread_set_state: 0
VM Region Summary:
ReadOnly portion of Libraries: Total=57.3M resident=36.7M(64%) swapped_out_or_unallocated=20.6M(36%)
Writable regions: Total=17.4M written=88K(0%) resident=132K(1%) swapped_out=0K(0%) unallocated=17.3M(99%)
REGION TYPE VIRTUAL
=========== =======
MALLOC 9396K
MALLOC guard page 16K
STACK GUARD 56.0M
Stack 8192K
__DATA 668K
__LINKEDIT 52.8M
__TEXT 4568K
shared memory 12K
=========== =======
TOTAL 131.1M