Filed by: nbeleuzu [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=360059834&repo=mozilla-central
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/P3ahrvmUQvWMQhHHXEEmQw/runs/0/artifacts/public/logs/live_backing.log

[task 2021-12-03T10:35:36.530Z] 10:35:36     INFO -  33:27.60 TEST-UNEXPECTED-FAIL | valgrind-test | 24 bytes in 1 blocks are definitely lost at malloc / alloc / __rdl_alloc / alloc
[task 2021-12-03T10:35:36.530Z] 10:35:36     INFO -  33:27.60 ==11209== 24 bytes in 1 blocks are definitely lost in loss record 3,367 of 12,561
[task 2021-12-03T10:35:36.530Z] 10:35:36     INFO -  33:27.60 ==11209==    at 0x48397B5: malloc+117 (vg_replace_malloc.c:380)
[task 2021-12-03T10:35:36.533Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0x102CF564: alloc (library/std/src/sys/unix/alloc.rs:14)
[task 2021-12-03T10:35:36.533Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0x102CF564: __rdl_alloc (library/std/src/alloc.rs:355)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0x102CF564: alloc (alloc.rs:86)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0x102CF564: alloc_impl (alloc.rs:166)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0x102CF564: allocate (alloc.rs:226)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0x102CF564: exchange_malloc (alloc.rs:315)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0x102CF564: new<rayon_core::thread_pool::ThreadPool> (sync.rs:346)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0x102CF564: wr_thread_pool_new+2212 (bindings.rs:1109)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xBD6BCCD: WebRenderThreadPool (checkouts/gecko/gfx/webrender_bindings/RenderThread.cpp:1082)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xBD6BCCD: RenderThread (checkouts/gecko/gfx/webrender_bindings/RenderThread.cpp:72)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xBD6BCCD: mozilla::wr::RenderThread::Start()+221 (checkouts/gecko/gfx/webrender_bindings/RenderThread.cpp:114)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xBCB2841: InitLayersIPC (checkouts/gecko/gfx/thebes/gfxPlatform.cpp:1290)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xBCB2841: gfxPlatform::Init()+3041 (checkouts/gecko/gfx/thebes/gfxPlatform.cpp:956)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xBCB1C2F: gfxPlatform::GetPlatform()+31 (checkouts/gecko/gfx/thebes/gfxPlatform.cpp:466)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xD7F68D1: mozilla::widget::GfxInfoBase::GetContentBackend(nsTSubstring<char16_t>&)+33 (checkouts/gecko/widget/GfxInfoBase.cpp:1812)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xAF45E65: ??? (xptcinvoke_asm_x86_64_unix.S:101)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xB948F2C: Invoke (checkouts/gecko/js/xpconnect/src/XPCWrappedNative.cpp:1631)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xB948F2C: Call (checkouts/gecko/js/xpconnect/src/XPCWrappedNative.cpp:1184)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xB948F2C: XPCWrappedNative::CallMethod(XPCCallContext&, XPCWrappedNative::CallMode)+4060 (checkouts/gecko/js/xpconnect/src/XPCWrappedNative.cpp:1130)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xB94A6B1: GetAttribute (checkouts/gecko/js/xpconnect/src/xpcprivate.h:1465)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xB94A6B1: XPC_WN_GetterSetter(JSContext*, unsigned int, JS::Value*)+625 (checkouts/gecko/js/xpconnect/src/XPCWrappedNativeJSOps.cpp:961)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED342D0: CallJSNative (checkouts/gecko/js/src/vm/Interpreter.cpp:388)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED342D0: js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct, js::CallReason)+768 (checkouts/gecko/js/src/vm/Interpreter.cpp:475)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED34DCC: InternalCall (checkouts/gecko/js/src/vm/Interpreter.cpp:535)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED34DCC: js::Call(JSContext*, JS::Handle<JS::Value>, JS::Handle<JS::Value>, js::AnyInvokeArgs const&, JS::MutableHandle<JS::Value>, js::CallReason)+156 (checkouts/gecko/js/src/vm/Interpreter.cpp:552)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED35676: js::CallGetter(JSContext*, JS::Handle<JS::Value>, JS::Handle<JS::Value>, JS::MutableHandle<JS::Value>)+150 (checkouts/gecko/js/src/vm/Interpreter.cpp:678)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xEF02591: CallGetter (checkouts/gecko/js/src/vm/NativeObject.cpp:1959)
[task 2021-12-03T10:35:36.534Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xEF02591: GetExistingProperty<js::CanGC> (checkouts/gecko/js/src/vm/NativeObject.cpp:1987)
[task 2021-12-03T10:35:36.535Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xEF02591: NativeGetPropertyInline<js::CanGC> (checkouts/gecko/js/src/vm/NativeObject.cpp:2133)
[task 2021-12-03T10:35:36.535Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xEF02591: js::NativeGetProperty(JSContext*, JS::Handle<js::NativeObject*>, JS::Handle<JS::Value>, JS::Handle<JS::PropertyKey>, JS::MutableHandle<JS::Value>)+2241 (checkouts/gecko/js/src/vm/NativeObject.cpp:2164)
[task 2021-12-03T10:35:36.535Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED2D3D5: GetProperty (checkouts/gecko/js/src/vm/ObjectOperations-inl.h:115)
[task 2021-12-03T10:35:36.535Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED2D3D5: GetObjectElementOperation (checkouts/gecko/js/src/vm/Interpreter-inl.h:413)
[task 2021-12-03T10:35:36.535Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED2D3D5: GetElementOperationWithStackIndex (checkouts/gecko/js/src/vm/Interpreter-inl.h:497)
[task 2021-12-03T10:35:36.535Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED2D3D5: Interpret(JSContext*, js::RunState&)+31717 (checkouts/gecko/js/src/vm/Interpreter.cpp:3042)
[task 2021-12-03T10:35:36.535Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED257B1: js::RunScript(JSContext*, js::RunState&)+657 (checkouts/gecko/js/src/vm/Interpreter.cpp:357)
[task 2021-12-03T10:35:36.535Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED34607: js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct, js::CallReason)+1591 (checkouts/gecko/js/src/vm/Interpreter.cpp:507)
[task 2021-12-03T10:35:36.535Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED34DCC: InternalCall (checkouts/gecko/js/src/vm/Interpreter.cpp:535)
[task 2021-12-03T10:35:36.535Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED34DCC: js::Call(JSContext*, JS::Handle<JS::Value>, JS::Handle<JS::Value>, js::AnyInvokeArgs const&, JS::MutableHandle<JS::Value>, js::CallReason)+156 (checkouts/gecko/js/src/vm/Interpreter.cpp:552)
[task 2021-12-03T10:35:36.535Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED35676: js::CallGetter(JSContext*, JS::Handle<JS::Value>, JS::Handle<JS::Value>, JS::MutableHandle<JS::Value>)+150 (checkouts/gecko/js/src/vm/Interpreter.cpp:678)
[task 2021-12-03T10:35:36.535Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xEF02591: CallGetter (checkouts/gecko/js/src/vm/NativeObject.cpp:1959)
[task 2021-12-03T10:35:36.535Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xEF02591: GetExistingProperty<js::CanGC> (checkouts/gecko/js/src/vm/NativeObject.cpp:1987)
[task 2021-12-03T10:35:36.535Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xEF02591: NativeGetPropertyInline<js::CanGC> (checkouts/gecko/js/src/vm/NativeObject.cpp:2133)
[task 2021-12-03T10:35:36.535Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xEF02591: js::NativeGetProperty(JSContext*, JS::Handle<js::NativeObject*>, JS::Handle<JS::Value>, JS::Handle<JS::PropertyKey>, JS::MutableHandle<JS::Value>)+2241 (checkouts/gecko/js/src/vm/NativeObject.cpp:2164)
[task 2021-12-03T10:35:36.536Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED372DE: GetProperty (checkouts/gecko/js/src/vm/ObjectOperations-inl.h:115)
[task 2021-12-03T10:35:36.536Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED372DE: GetProperty (checkouts/gecko/js/src/vm/ObjectOperations-inl.h:122)
[task 2021-12-03T10:35:36.536Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED372DE: js::GetProperty(JSContext*, JS::Handle<JS::Value>, JS::Handle<js::PropertyName*>, JS::MutableHandle<JS::Value>)+1038 (checkouts/gecko/js/src/vm/Interpreter.cpp:4552)
[task 2021-12-03T10:35:36.536Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED2BEB7: GetPropertyOperation (checkouts/gecko/js/src/vm/Interpreter.cpp:204)
[task 2021-12-03T10:35:36.536Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED2BEB7: Interpret(JSContext*, js::RunState&)+26311 (checkouts/gecko/js/src/vm/Interpreter.cpp:2907)
[task 2021-12-03T10:35:36.536Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED257B1: js::RunScript(JSContext*, js::RunState&)+657 (checkouts/gecko/js/src/vm/Interpreter.cpp:357)
[task 2021-12-03T10:35:36.536Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED34607: js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct, js::CallReason)+1591 (checkouts/gecko/js/src/vm/Interpreter.cpp:507)
[task 2021-12-03T10:35:36.537Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED34DCC: InternalCall (checkouts/gecko/js/src/vm/Interpreter.cpp:535)
[task 2021-12-03T10:35:36.537Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xED34DCC: js::Call(JSContext*, JS::Handle<JS::Value>, JS::Handle<JS::Value>, js::AnyInvokeArgs const&, JS::MutableHandle<JS::Value>, js::CallReason)+156 (checkouts/gecko/js/src/vm/Interpreter.cpp:552)
[task 2021-12-03T10:35:36.537Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xEDFE2DE: JS_CallFunctionValue(JSContext*, JS::Handle<JSObject*>, JS::Handle<JS::Value>, JS::HandleValueArray const&, JS::MutableHandle<JS::Value>)+654 (checkouts/gecko/js/src/vm/CallAndConstruct.cpp:53)
[task 2021-12-03T10:35:36.537Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xB94460D: nsXPCWrappedJS::CallMethod(unsigned short, nsXPTMethodInfo const*, nsXPTCMiniVariant*)+2909 (checkouts/gecko/js/xpconnect/src/XPCWrappedJSClass.cpp:973)
[task 2021-12-03T10:35:36.537Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xAF46BE4: PrepareAndDispatch+548 (checkouts/gecko/xpcom/reflect/xptcall/md/unix/xptcstubs_x86_64_linux.cpp:115)
[task 2021-12-03T10:35:36.537Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xAF4601E: SharedStub+90 (in /builds/worker/workspace/obj-build/toolkit/library/build/libxul.so)
[task 2021-12-03T10:35:36.538Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xAF0C8D2: NS_CreateServicesFromCategory(char const*, nsISupports*, char const*, char16_t const*)+1122 (checkouts/gecko/xpcom/components/nsCategoryManager.cpp:687)
[task 2021-12-03T10:35:36.538Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xEC6BEBA: nsXREDirProvider::DoStartup()+442 (checkouts/gecko/toolkit/xre/nsXREDirProvider.cpp:976)
[task 2021-12-03T10:35:36.538Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xEC5F013: XREMain::XRE_mainRun()+1491 (checkouts/gecko/toolkit/xre/nsAppRunner.cpp:5045)
[task 2021-12-03T10:35:36.538Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xEC5FFA5: XREMain::XRE_main(int, char**, mozilla::BootstrapConfig const&)+1189 (checkouts/gecko/toolkit/xre/nsAppRunner.cpp:5495)
[task 2021-12-03T10:35:36.538Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0xEC602F9: XRE_main(int, char**, mozilla::BootstrapConfig const&)+153 (checkouts/gecko/toolkit/xre/nsAppRunner.cpp:5554)
[task 2021-12-03T10:35:36.538Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0x12B3F5: do_main (checkouts/gecko/browser/app/nsBrowserApp.cpp:225)
[task 2021-12-03T10:35:36.539Z] 10:35:36     INFO -  33:27.60 ==11209==    by 0x12B3F5: main+1045 (checkouts/gecko/browser/app/nsBrowserApp.cpp:395)

The upgrade of rustc added some frames between calls, either from better
debug info, or from changes in optimizations.

Set release status flags based on info from the regressing bug 1742749

https://hg.mozilla.org/mozilla-central/rev/ccf218f32ae1

This is still happening: https://treeherder.mozilla.org/logviewer?job_id=360337619&repo=autoland&lineNumber=69463
Mike, should we reopen this bug or create a new one for it?

(In reply to Alexandru Michis [:malexandru] from comment #6)

This is still happening: https://treeherder.mozilla.org/logviewer?job_id=360337619&repo=autoland&lineNumber=69463
Mike, should we reopen this bug or create a new one for it?

No, that would be a regression. I bet on e754af875d57e5ad3ce30e7aac0b8dd8f5918551. I backfilled.

Looks like it was solved by backing out e754af875d57e5ad3ce30e7aac0b8dd8f5918551 earlier, the valgrind job above turned green.
Thank you for taking a look