thread '<unnamed>' panicked at 'got unknown property name from Gecko: ()', ../src/libcore/result.rs:799 stack backtrace: 1: 0x7fffea9ba11f - std::sys::backtrace::tracing::imp::write::hd6ece0fd16ebfe06 2: 0x7fffea9c967d - std::panicking::default_hook::{{closure}}::h523f1cb7f97bbc83 3: 0x7fffea9c6bda - std::panicking::default_hook::hc3c81c24cdcc8c31 4: 0x7fffea9c71d8 - std::panicking::rust_panic_with_hook::hf4b937f570e0ba05 5: 0x7fffea9c7032 - std::panicking::begin_panic::h4a0c5d0b7e602ca9 6: 0x7fffea9c6fb0 - std::panicking::begin_panic_fmt::h76753862db1b73c1 7: 0x7fffea9c6f31 - rust_begin_unwind 8: 0x7fffea9d92af - core::panicking::panic_fmt::h01b74bf8a81c45ca 9: 0x7fffe9d7d93e - core::result::unwrap_failed::ha1afe20e3ec72757 at /buildslave/rust-buildbot/slave/beta-dist-rustc-linux/build/obj/../src/libcore/macros.rs:29 10: 0x7fffe9d5e991 - <core::result::Result<T, E>>::expect::h40016a88d12b0800 at /buildslave/rust-buildbot/slave/beta-dist-rustc-linux/build/obj/../src/libcore/result.rs:761 11: 0x7fffe9eac345 - geckoservo::glue::get_property_id_from_atom::h877504ef90fb562e at /z/stylo/hg-incubator/servo/ports/geckolib/glue.rs:655 12: 0x7fffe9eac5d0 - Servo_DeclarationBlock_SetProperty at /z/stylo/hg-incubator/servo/ports/geckolib/glue.rs:682 13: 0x7fffe6db4feb - _ZN19nsDOMCSSDeclaration18ParsePropertyValueE15nsCSSPropertyIDRK18nsAString_internalb at /z/stylo/hg-incubator/layout/style/nsDOMCSSDeclaration.cpp:310 14: 0x7fffe6db4b32 - _ZN19nsDOMCSSDeclaration16SetPropertyValueE15nsCSSPropertyIDRK18nsAString_internal at /z/stylo/hg-incubator/layout/style/nsDOMCSSDeclaration.cpp:92 15: 0x7fffe6db49f0 - _ZN28nsDOMCSSAttributeDeclaration16SetPropertyValueE15nsCSSPropertyIDRK18nsAString_internal at /z/stylo/hg-incubator/layout/style/nsDOMCSSAttrDeclaration.cpp:203 16: 0x7fffe4be8761 - _ZN19nsDOMCSSDeclaration19SetCounterIncrementERK18nsAString_internalRN7mozilla11ErrorResultE at /z/stylo/hg-incubator/layout/style/nsCSSPropList.h:1598 17: 0x7fffe4b33020 - _ZN7mozilla3dom21CSS2PropertiesBindingL20set_counterIncrementEP9JSContextN2JS6HandleIP8JSObjectEEP19nsDOMCSSDeclaration19JSJitSetterCallArgs at /z/stylo/hg-incubator/obj/dom/bindings/CSS2PropertiesBinding.cpp:14531 18: 0x7fffe58aa3d7 - _ZN7mozilla3dom20GenericBindingSetterEP9JSContextjPN2JS5ValueE at /z/stylo/hg-incubator/dom/bindings/BindingUtils.cpp:2854 19: 0x7fffe96a761c - _ZN2js12CallJSNativeEP9JSContextPFbS1_jPN2JS5ValueEERKNS2_8CallArgsE at /z/stylo/hg-incubator/js/src/jscntxtinlines.h:239 20: 0x7fffe968b46f - _ZN2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstructE at /z/stylo/hg-incubator/js/src/vm/Interpreter.cpp:457 21: 0x7fffe968b86e - _ZL12InternalCallP9JSContextRKN2js13AnyInvokeArgsE at /z/stylo/hg-incubator/js/src/vm/Interpreter.cpp:502 22: 0x7fffe968b8e5 - _ZN2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_EE at /z/stylo/hg-incubator/js/src/vm/Interpreter.cpp:521 23: 0x7fffe968c47a - _ZN2js10CallSetterEP9JSContextN2JS6HandleINS2_5ValueEEES5_S5_ at /z/stylo/hg-incubator/js/src/vm/Interpreter.cpp:648 24: 0x7fffe96eabe7 - _ZL19SetExistingPropertyP9JSContextN2JS6HandleIPN2js12NativeObjectEEENS2_I4jsidEENS2_INS1_5ValueEEESA_S6_NS2_IPNS3_5ShapeEEERNS1_14ObjectOpResultE at /z/stylo/hg-incubator/js/src/vm/NativeObject.cpp:2437 25: 0x7fffe96ea211 - _ZN2js17NativeSetPropertyEP9JSContextN2JS6HandleIPNS_12NativeObjectEEENS3_I4jsidEENS3_INS2_5ValueEEESA_NS_13QualifiedBoolERNS2_14ObjectOpResultE at /z/stylo/hg-incubator/js/src/vm/NativeObject.cpp:2472 26: 0x7fffe8dc19ae - _ZN2js11SetPropertyEP9JSContextN2JS6HandleIP8JSObjectEENS3_I4jsidEENS3_INS2_5ValueEEESA_RNS2_14ObjectOpResultE at /z/stylo/hg-incubator/js/src/vm/NativeObject.h:1540 27: 0x7fffe9505d1c - _ZN2js30SetPropertyIgnoringNamedGetterEP9JSContextN2JS6HandleIP8JSObjectEENS3_I4jsidEENS3_INS2_5ValueEEESA_NS3_INS2_18PropertyDescriptorEEERNS2_14ObjectOpResultE at /z/stylo/hg-incubator/js/src/proxy/BaseProxyHandler.cpp:182 28: 0x7fffe58ae788 - _ZNK7mozilla3dom15DOMProxyHandler3setEP9JSContextN2JS6HandleIP8JSObjectEENS5_I4jsidEENS5_INS4_5ValueEEESC_RNS4_14ObjectOpResultE at /z/stylo/hg-incubator/dom/bindings/DOMJSProxyHandler.cpp:258 29: 0x7fffe950db84 - _ZN2js5Proxy3setEP9JSContextN2JS6HandleIP8JSObjectEENS4_I4jsidEENS4_INS3_5ValueEEESB_RNS3_14ObjectOpResultE at /z/stylo/hg-incubator/js/src/proxy/Proxy.cpp:333 30: 0x7fffe950f37c - _ZN2js17proxy_SetPropertyEP9JSContextN2JS6HandleIP8JSObjectEENS3_I4jsidEENS3_INS2_5ValueEEESA_RNS2_14ObjectOpResultE at /z/stylo/hg-incubator/js/src/proxy/Proxy.cpp:589 31: 0x7fffe9461f2c - _ZN8JSObject20nonNativeSetPropertyEP9JSContextN2JS6HandleIPS_EENS3_I4jsidEENS3_INS2_5ValueEEES9_RNS2_14ObjectOpResultE at /z/stylo/hg-incubator/js/src/jsobj.cpp:1019 32: 0x7fffe8dc194d - _ZN2js11SetPropertyEP9JSContextN2JS6HandleIP8JSObjectEENS3_I4jsidEENS3_INS2_5ValueEEESA_RNS2_14ObjectOpResultE at /z/stylo/hg-incubator/js/src/vm/NativeObject.h:1539 33: 0x7fffe969b30f - _ZL20SetPropertyOperationP9JSContext4JSOpN2JS6HandleINS2_5ValueEEENS3_I4jsidEES5_ at /z/stylo/hg-incubator/js/src/vm/Interpreter.cpp:259 34: 0x7fffe967e1a6 - _ZL9InterpretP9JSContextRN2js8RunStateE at /z/stylo/hg-incubator/js/src/vm/Interpreter.cpp:2712 35: 0x7fffe96752cf - _ZN2js9RunScriptEP9JSContextRNS_8RunStateE at /z/stylo/hg-incubator/js/src/vm/Interpreter.cpp:403 36: 0x7fffe968b567 - _ZN2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstructE at /z/stylo/hg-incubator/js/src/vm/Interpreter.cpp:475 37: 0x7fffe968b86e - _ZL12InternalCallP9JSContextRKN2js13AnyInvokeArgsE at /z/stylo/hg-incubator/js/src/vm/Interpreter.cpp:502 38: 0x7fffe968b8e5 - _ZN2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_EE at /z/stylo/hg-incubator/js/src/vm/Interpreter.cpp:521 39: 0x7fffe937d1af - _ZN2JS4CallEP9JSContextNS_6HandleINS_5ValueEEES4_RKNS_16HandleValueArrayENS_13MutableHandleIS3_EE at /z/stylo/hg-incubator/js/src/jsapi.cpp:2830 40: 0x7fffe554405e - _ZN7mozilla3dom19EventHandlerNonNull4CallEP9JSContextN2JS6HandleINS4_5ValueEEERNS0_5EventENS4_13MutableHandleIS6_EERNS_11ErrorResultE at /z/stylo/hg-incubator/obj/dom/bindings/EventHandlerBinding.cpp:259 41: 0x7fffe5b8575f - _ZN7mozilla3dom19EventHandlerNonNull4CallIP11nsISupportsEEvRKT_RNS0_5EventEN2JS13MutableHandleINSA_5ValueEEERNS_11ErrorResultEPKcNS0_14CallbackObject17ExceptionHandlingEP13JSCompartment at /z/stylo/hg-incubator/obj/dist/include/mozilla/dom/EventHandlerBinding.h:361 42: 0x7fffe5b761c0 - _ZN7mozilla14JSEventHandler11HandleEventEP11nsIDOMEvent at /z/stylo/hg-incubator/dom/events/JSEventHandler.cpp:214 43: 0x7fffe5b60890 - _ZN7mozilla20EventListenerManager18HandleEventSubTypeEPNS0_8ListenerEP11nsIDOMEventPNS_3dom11EventTargetE at /z/stylo/hg-incubator/dom/events/EventListenerManager.cpp:1133 44: 0x7fffe5b60fbd - _ZN7mozilla20EventListenerManager19HandleEventInternalEP13nsPresContextPNS_11WidgetEventEPP11nsIDOMEventPNS_3dom11EventTargetEP13nsEventStatus at /z/stylo/hg-incubator/dom/events/EventListenerManager.cpp:1286 45: 0x7fffe5b8af7c - _ZN7mozilla20EventListenerManager11HandleEventEP13nsPresContextPNS_11WidgetEventEPP11nsIDOMEventPNS_3dom11EventTargetEP13nsEventStatus at /z/stylo/hg-incubator/obj/dist/include/mozilla/EventListenerManager.h:374 46: 0x7fffe5b7dd37 - _ZN7mozilla20EventTargetChainItem11HandleEventERNS_21EventChainPostVisitorERNS_19ELMCreationDetectorE at /z/stylo/hg-incubator/dom/events/EventDispatcher.cpp:314 47: 0x7fffe5b58809 - _ZN7mozilla20EventTargetChainItem22HandleEventTargetChainER8nsTArrayIS0_ERNS_21EventChainPostVisitorEPNS_24EventDispatchingCallbackERNS_19ELMCreationDetectorE at /z/stylo/hg-incubator/dom/events/EventDispatcher.cpp:463 48: 0x7fffe5b59dde - _ZN7mozilla15EventDispatcher8DispatchEP11nsISupportsP13nsPresContextPNS_11WidgetEventEP11nsIDOMEventP13nsEventStatusPNS_24EventDispatchingCallbackEP8nsTArrayIPNS_3dom11EventTargetEE at /z/stylo/hg-incubator/dom/events/EventDispatcher.cpp:820 49: 0x7fffe6f7eef4 - _ZN16nsDocumentViewer12LoadCompleteE8nsresult at /z/stylo/hg-incubator/layout/base/nsDocumentViewer.cpp:1024 50: 0x7fffe772771c - _ZN10nsDocShell11EndPageLoadEP14nsIWebProgressP10nsIChannel8nsresult at /z/stylo/hg-incubator/docshell/base/nsDocShell.cpp:7571 51: 0x7fffe77259d2 - _ZN10nsDocShell13OnStateChangeEP14nsIWebProgressP10nsIRequestj8nsresult at /z/stylo/hg-incubator/docshell/base/nsDocShell.cpp:7375 52: 0x7fffe3f27ccd - _ZN11nsDocLoader19DoFireOnStateChangeEP14nsIWebProgressP10nsIRequestRi8nsresult at /z/stylo/hg-incubator/uriloader/base/nsDocLoader.cpp:1255 53: 0x7fffe3f277a8 - _ZN11nsDocLoader18doStopDocumentLoadEP10nsIRequest8nsresult at /z/stylo/hg-incubator/uriloader/base/nsDocLoader.cpp:840 54: 0x7fffe3f2626e - _ZN11nsDocLoader16DocLoaderIsEmptyEb at /z/stylo/hg-incubator/uriloader/base/nsDocLoader.cpp:730 55: 0x7fffe3f271ab - _ZN11nsDocLoader13OnStopRequestEP10nsIRequestP11nsISupports8nsresult at /z/stylo/hg-incubator/uriloader/base/nsDocLoader.cpp:612 56: 0x7fffe2c4798e - _ZN7mozilla3net11nsLoadGroup13RemoveRequestEP10nsIRequestP11nsISupports8nsresult at /z/stylo/hg-incubator/netwerk/base/nsLoadGroup.cpp:633 57: 0x7fffe48a9dcf - _ZN10nsDocument15DoUnblockOnloadEv at /z/stylo/hg-incubator/dom/base/nsDocument.cpp:8622 58: 0x7fffe48a9b8c - _ZN10nsDocument13UnblockOnloadEb at /z/stylo/hg-incubator/dom/base/nsDocument.cpp:8550 59: 0x7fffe489ab72 - _ZN10nsDocument27DispatchContentLoadedEventsEv at /z/stylo/hg-incubator/dom/base/nsDocument.cpp:5058 60: 0x7fffe4928d19 - _ZN7mozilla6detail23RunnableMethodArgumentsIJEE9applyImplI10nsDocumentMS4_FvvEJEJEEEDTcldsdefp_fp0_spcldtcl3GetIXT2_EEfp1_E15PassAsParameterEEEPT_T0_RNS_5TupleIJDpT1_EEENS_13IndexSequenceIJXspT2_EEEE at /z/stylo/hg-incubator/obj/dist/include/nsThreadUtils.h:791 61: 0x7fffe4928c98 - _ZN7mozilla6detail23RunnableMethodArgumentsIJEE5applyI10nsDocumentMS4_FvvEEEDTcl9applyImplfp_fp0_dtdefpT10mArgumentscvNS_13IndexSequenceIJEEE_EEEPT_T0_ at /z/stylo/hg-incubator/obj/dist/include/nsThreadUtils.h:797 62: 0x7fffe4928b21 - _ZN7mozilla6detail18RunnableMethodImplIM10nsDocumentFvvELb1ELb0EJEE3RunEv at /z/stylo/hg-incubator/obj/dist/include/nsThreadUtils.h:826 63: 0x7fffe2ad0ca7 - _ZN8nsThread16ProcessNextEventEbPb at /z/stylo/hg-incubator/xpcom/threads/nsThread.cpp:1213 64: 0x7fffe2b505fb - _Z19NS_ProcessNextEventP9nsIThreadb at /z/stylo/hg-incubator/xpcom/glue/nsThreadUtils.cpp:381 65: 0x7fffe33cb0e8 - _ZN7mozilla3ipc11MessagePump3RunEPN4base11MessagePump8DelegateE at /z/stylo/hg-incubator/ipc/glue/MessagePump.cpp:96 66: 0x7fffe33296c4 - _ZN11MessageLoop11RunInternalEv at /z/stylo/hg-incubator/ipc/chromium/src/base/message_loop.cc:232 67: 0x7fffe3329644 - _ZN11MessageLoop10RunHandlerEv at /z/stylo/hg-incubator/ipc/chromium/src/base/message_loop.cc:225 68: 0x7fffe332961c - _ZN11MessageLoop3RunEv at /z/stylo/hg-incubator/ipc/chromium/src/base/message_loop.cc:205 69: 0x7fffe6ad4002 - _ZN14nsBaseAppShell3RunEv at /z/stylo/hg-incubator/widget/nsBaseAppShell.cpp:156 70: 0x7fffe7cab191 - _ZN12nsAppStartup3RunEv at /z/stylo/hg-incubator/toolkit/components/startup/nsAppStartup.cpp:283 71: 0x7fffe7da48ab - _ZN7XREMain11XRE_mainRunEv at /z/stylo/hg-incubator/toolkit/xre/nsAppRunner.cpp:4485 72: 0x7fffe7da5395 - _ZN7XREMain8XRE_mainEiPPcPK12nsXREAppData at /z/stylo/hg-incubator/toolkit/xre/nsAppRunner.cpp:4618 73: 0x7fffe7da5b6e - XRE_main at /z/stylo/hg-incubator/toolkit/xre/nsAppRunner.cpp:4709 74: 0x40633e - _ZL7do_mainiPPcS0_P7nsIFile at /z/stylo/hg-incubator/browser/app/nsBrowserApp.cpp:328 75: 0x405a61 - main at /z/stylo/hg-incubator/browser/app/nsBrowserApp.cpp:461 76: 0x7ffff6d6c82f - __libc_start_main 77: 0x4058f8 - _start

dom/html/crashtests/395340-1.html layout/base/crashtests/403245-1.html layout/base/crashtests/416107.xhtml layout/base/crashtests/420219-1.html layout/base/crashtests/455623-1.html layout/base/crashtests/691118-1.html layout/base/crashtests/725535.html layout/base/crashtests/727601.html layout/base/crashtests/788360.html layout/generic/crashtests/397844-1.xhtml layout/generic/crashtests/397844-2.xhtml layout/generic/crashtests/400223-1.html layout/generic/crashtests/403143-1.html layout/generic/crashtests/411835.html layout/generic/crashtests/437156-1.html layout/generic/crashtests/444861-1.html layout/generic/crashtests/448996-1.html layout/generic/crashtests/514800-1.html layout/generic/crashtests/673770.html

layout/style/crashtests/1074651-1.html layout/svg/crashtests/459666-1.html layout/svg/crashtests/789390-1.html layout/tables/crashtests/404301-1.xhtml

layout/xul/crashtests/397293.xhtml layout/style/crashtests/456196.html layout/style/crashtests/1277908-1.html

This one looks straightforward and should unblock about 30 tests. Putting it on Manish's pile for now, but feel free to punt it if this is too many. :-)

This was fixed by xidorn in https://github.com/servo/servo/commit/e73bb054c559ff5a0731d33b0806cfcbd9425033#diff-b7611dde2809bb07d05c81111b7fc93aR659 If we fail property id parsing we now bail out of the Servo_* call early.