Certain VS2010 build configurations will cause mongo_sm.exe to segfault. Specifically, the builds that are known to do this now:

Release Win32
Release x64
Win2008PlusRelease Win32
Win2008PlusRelease x64

stack trace:

MongoDB shell version: 2.4.0-rc2-pre-
Tue Mar 05 23:35:32.278 mongo got signal 11 (SIGSEGV), stack trace:

Tue Mar 05 23:35:32.667 mongo_sm.exe ...\src\mongo\shell\dbshell.cpp(216)
quitAbruptly+0x14f
Tue Mar 05 23:35:32.668 mongo_sm.exe f:\dd\vctools\crt_bld\self_64_amd64\crt\sr
c\winxfltr.c(372) _XcptFilter+0x1ad
Tue Mar 05 23:35:32.668 mongo_sm.exe f:\dd\vctools\crt_bld\self_64_amd64\crt\sr
c\threadex.c(316) _callthreadstartex$filt$0+0x16
Tue Mar 05 23:35:32.668 mongo_sm.exe
__C_specific_handler+0x97
Tue Mar 05 23:35:32.668 ntdll.dll
RtlDecodePointer+0xbd
Tue Mar 05 23:35:32.668 ntdll.dll
RtlUnwindEx+0xbbf
Tue Mar 05 23:35:32.668 ntdll.dll
KiUserExceptionDispatcher+0x2e
Tue Mar 05 23:35:32.668 mongo_sm.exe ...\src\third_party\js-1.7\jsparse.c(972)
BindLocalVariable+0x3d
Tue Mar 05 23:35:32.669 mongo_sm.exe ...\src\third_party\js-1.7\jsparse.c(1876)
BindVarOrConst+0x3dd
Tue Mar 05 23:35:32.669 mongo_sm.exe ...\src\third_party\js-1.7\jsparse.c(3711)
Variables+0x1fa
Tue Mar 05 23:35:32.669 mongo_sm.exe ...\src\third_party\js-1.7\jsparse.c(3308)
Statement+0x1908
Tue Mar 05 23:35:32.670 mongo_sm.exe ...\src\third_party\js-1.7\jsparse.c(1463)
Statements+0x12a
Tue Mar 05 23:35:32.670 mongo_sm.exe ...\src\third_party\js-1.7\jsparse.c(502)
js_CompileTokenStream+0x72
Tue Mar 05 23:35:32.671 mongo_sm.exe ...\src\third_party\js-1.7\jsapi.c(3774)
CompileTokenStream+0x17e
Tue Mar 05 23:35:32.671 mongo_sm.exe ...\src\third_party\js-1.7\jsapi.c(3870)
JS_CompileUCScriptForPrincipals+0x70
Tue Mar 05 23:35:32.671 mongo_sm.exe ...\src\third_party\js-1.7\jsapi.c(4293)
JS_EvaluateUCScriptForPrincipals+0x50
Tue Mar 05 23:35:32.672 mongo_sm.exe ...\src\third_party\js-1.7\jsapi.c(4240)
JS_EvaluateScript+0xb2
Tue Mar 05 23:35:32.672 mongo_sm.exe ...\src\mongo\scripting\engine_spidermonke
y.cpp(1622) mongo::spidermonkey::SMScope::exec+0x13b
Tue Mar 05 23:35:32.673 mongo_sm.exe ...\src\mongo\scripting\engine.h(116)
mongo::Scope::execSetup+0x22
Tue Mar 05 23:35:32.673 mongo_sm.exe ...\src\mongo\scripting\engine.h(119)
mongo::Scope::execSetup+0x77