See testcase, which crashes on desktop when clicking on the button. You need to have the specialpowers extension installed to see the crash: http://people.mozilla.org/~mwargers/extensions/specialpowers/specialpowers.xpi This bug was filed from the Socorro interface and is report bp-1241b536-8224-413c-839f-7c3762121209 . ============================================================= 0 xul.dll mozilla::dom::power::PowerManagerService::PowerOff dom/power/PowerManagerService.cpp:130 1 xul.dll mozilla::dom::power::PowerManager::PowerOff dom/power/PowerManager.cpp:87 2 xul.dll NS_InvokeByIndex_P xpcom/reflect/xptcall/src/md/win32/xptcinvoke.cpp:70 3 xul.dll XPC_WN_CallMethod js/xpconnect/src/XPCWrappedNativeJSOps.cpp:1488 4 mozjs.dll js::InvokeKernel js/src/jsinterp.cpp:369 5 mozjs.dll js::Interpret js/src/jsinterp.cpp:2321 6 mozjs.dll js::RunScript js/src/jsinterp.cpp:318 7 mozjs.dll js::ExecuteKernel js/src/jsinterp.cpp:515 8 mozjs.dll js::Execute js/src/jsinterp.cpp:553 9 mozjs.dll JS::Evaluate js/src/jsapi.cpp:5605 10 xul.dll nsJSContext::EvaluateString dom/base/nsJSEnvironment.cpp:1524 etc..

Could you reproduce this on a Linux build? I can't reproduce on my nightly.

I got it, SpecialPowers is not working (gdb) bt #0 0x00007ffff3bcaf80 in mozilla::dom::power::PowerManagerService::Restart (this=0xfffffffffee1dead) at /home/kanru/zone2/mozilla/central/dom/power/PowerManagerService.cpp:141 #1 0x00007ffff58f49b8 in ?? () from /home/kanru/zone2/mozilla/central/obj-x86_64-unknown-linux-gnu/dist/bin/libxul.so #2 0x00007fffd0ff99a0 in ?? () #3 0x00007ffffffe7f90 in ?? () #4 0x00007ffff3bc9c78 in mozilla::dom::power::PowerManager::PowerOff ( this=0x7ffff4689940) at /home/kanru/zone2/mozilla/central/dom/power/PowerManager.cpp:87

Gene could take a look?

Still crashes if I remove the StartForceQuitWatchdog line. #0 _mm_load_si128 (__P=0x7fffcebecfe0) at /home/kanru/zone2/mozilla/central/xpcom/string/src/nsUTF8UtilsSSE2.cpp:79 #1 LossyConvertEncoding8to16::write_sse2 (this=0x7ffffffe70b8, aSource=0x7fffcebecfe0 "[Exception... \"Component returned failure code: 0xc1f30001 (NS_ERROR_NOT_INITIALIZED) [nsIDownloadManager.cleanUp]\" nsresult: \"0xc1f30001 (NS_ERROR_NOT_INITIALIZED)\" location: \"JS frame :: file:///h"..., aSourceLength=338) at /home/kanru/zone2/mozilla/central/xpcom/string/src/nsUTF8UtilsSSE2.cpp:79 #2 0x00007ffff38290f6 in LossyConvertEncoding8to16::write (this=0x7ffffffe70b8, aSource=0x7fffcebecfe0 "[Exception... \"Component returned failure code: 0xc1f30001 (NS_ERROR_NOT_INITIALIZED) [nsIDownloadManager.cleanUp]\" nsresult: \"0xc1f30001 (NS_ERROR_NOT_INITIALIZED)\" location: \"JS frame :: file:///h"..., aSourceLength=338) at ../../../dist/include/nsUTF8Utils.h:655 #3 0x00007ffff382a293 in nsCharSinkTraits<LossyConvertEncoding8to16>::write (iter=..., s=0x7fffcebecfe0 "[Exception... \"Component returned failure code: 0xc1f30001 (NS_ERROR_NOT_INITIALIZED) [nsIDownloadManager.cleanUp]\" nsresult: \"0xc1f30001 (NS_ERROR_NOT_INITIALIZED)\" location: \"JS frame :: file:///h"..., n=338) at ../../../dist/include/nsCharTraits.h:688 #4 0x00007ffff4835d10 in copy_string<nsReadingIterator<char>, LossyConvertEncoding8to16> (first=..., last=..., result=...) at ../../../dist/include/nsAlgorithm.h:89 #5 0x00007ffff48341da in AppendASCIItoUTF16 (aSource=..., aDest=...) at /home/kanru/zone2/mozilla/central/xpcom/string/src/nsReadableUtils.cpp:129 #6 0x00007ffff483426c in AppendASCIItoUTF16 (aSource=0x7fffcebecfe0 "[Exception... \"Component returned failure code: 0xc1f30001 (NS_ERROR_NOT_INITIALIZED) [nsIDownloadManager.cleanUp]\" nsresult: \"0xc1f30001 (NS_ERROR_NOT_INITIALIZED)\" location: \"JS frame :: file:///h"..., aDest=...) at /home/kanru/zone2/mozilla/central/xpcom/string/src/nsReadableUtils.cpp:144 #7 0x00007ffff31c6549 in NS_ConvertASCIItoUTF16::NS_ConvertASCIItoUTF16 (this=0x7ffffffe71d8, aCString=0x7fffcebecfe0 "[Exception... \"Component returned failure code: 0xc1f30001 (NS_ERROR_NOT_INITIALIZED) [nsIDownloadManager.cleanUp]\" nsresult: \"0xc1f30001 (NS_ERROR_NOT_INITIALIZED)\" location: \"JS frame :: file:///h"...) at ../../../dist/include/nsString.h:93 #8 0x00007ffff3fe6d15 in nsXPCWrappedJSClass::CheckForException (ccx=..., aPropertyName=0x7fffe6cb3f98 "observe", anInterfaceName=0x7fffccb8d8a0 "nsIObserver", aForceReport=true) at /home/kanru/zone2/mozilla/central/js/xpconnect/src/XPCWrappedJSClass.cpp:1064 #9 0x00007ffff3fe8459 in nsXPCWrappedJSClass::CallMethod (this=0x7fffe3a8f780, wrapper=0x7fffcead8380, methodIndex=3, info_=0x7fffe6cb3f78, nativeParams=0x7ffffffe7cb8) at /home/kanru/zone2/mozilla/central/js/xpconnect/src/XPCWrappedJSClass.cpp:1467 #10 0x00007ffff3fdf2b6 in nsXPCWrappedJS::CallMethod (this=0x7fffcead8380, methodIndex=3, info=0x7fffe6cb3f78, params=0x7ffffffe7cb8) at /home/kanru/zone2/mozilla/central/js/xpconnect/src/XPCWrappedJS.cpp:580 #11 0x00007ffff482fac5 in PrepareAndDispatch (self=0x7fffce067ce0, methodIndex=3, args=0x7ffffffe7e48, gpregs=0x7ffffffe7dc8, fpregs=0x7ffffffe7df8) at /home/kanru/zone2/mozilla/central/xpcom/reflect/xptcall/src/md/unix/xptcstubs_x86_64_linux.cpp:121 #12 0x00007ffff482ed23 in SharedStub () from /home/kanru/zone2/mozilla/central/obj-x86_64-unknown-linux-gnu/dist/bin/libxul.so #13 0x00007ffff47d2657 in nsObserverList::NotifyObservers (this=0x7fffd6ab3d80, aSubject=0x0, aTopic=0x7ffff58f4ad6 "profile-change-teardown", someData=0x7ffff58f4a98) at /home/kanru/zone2/mozilla/central/xpcom/ds/nsObserverList.cpp:99 #14 0x00007ffff47d3a53 in nsObserverService::NotifyObservers (this=0x7fffe6c86500, aSubject=0x0, aTopic=0x7ffff58f4ad6 "profile-change-teardown", someData=0x7ffff58f4a98) at /home/kanru/zone2/mozilla/central/xpcom/ds/nsObserverService.cpp:161 #15 0x00007ffff3bcaeb4 in mozilla::dom::power::PowerManagerService::SyncProfile (this=0xfffffffffee1dead) at /home/kanru/zone2/mozilla/central/dom/power/PowerManagerService.cpp:108 #16 0x00007ffff3bcaf76 in mozilla::dom::power::PowerManagerService::Restart (this=0xfffffffffee1dead) at /home/kanru/zone2/mozilla/central/dom/power/PowerManagerService.cpp:143 #17 0x00007ffff58f4998 in ?? () from /home/kanru/zone2/mozilla/central/obj-x86_64-unknown-linux-gnu/dist/bin/libxul.so #18 0x00007fffd6386bb0 in ?? () #19 0x00007ffffffe7f90 in ?? () #20 0x00007ffff3bc9c78 in mozilla::dom::power::PowerManager::PowerOff (this=0x7ffff468991a) at /home/kanru/zone2/mozilla/central/dom/power/PowerManager.cpp:87

PowerManager PowerOn/Off capabilities removed in bug 1382955. Marking incomplete.