https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68853
Bug ID: 68853
Summary: [6 Regression] gcc-6 miscompiles Chromium v8 garbage
collector
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: trippels at gcc dot gnu.org
Target Milestone: ---
Chromium build with gcc-6 crashes almost immediately in the
v8 (javascript) garbage collector.
Program received signal SIGSEGV, Segmentation fault.
0x0000555557830de0 in
v8::internal::IncrementalMarking::ActivateIncrementalWriteBarrier() ()
(gdb) bt
#0 0x0000555557830de0 in
v8::internal::IncrementalMarking::ActivateIncrementalWriteBarrier() ()
#1 0x0000555557831007 in v8::internal::IncrementalMarking::StartMarking() ()
#2 0x0000555557831163 in v8::internal::IncrementalMarking::Start(char const*)
()
#3 0x0000555557820e86 in
v8::internal::Heap::CollectGarbage(v8::internal::GarbageCollector, char const*,
char const*, v8::GCCallbackFlags) ()
#4 0x00005555577f0b7d in v8::internal::Factory::NewRawOneByteString(int,
v8::internal::PretenureFlag) ()
#5 0x0000555557b86b62 in v8::internal::Runtime_StringToLowerCase(int,
v8::internal::Object**, v8::internal::Isolate*) ()
markus@x4 Release % c++ -MMD -MF
obj/v8/src/heap/v8_base.incremental-marking.o.d -DV8_DEPRECATION_WARNINGS
-DCLD_VERSION=2 -D_FILE_OFFSET_BITS=64 -DDISABLE_NACL -DCHROMIUM_BUILD
-DUI_COMPOSITOR_IMAGE_TRANSPORT -DUSE_AURA=1 -DUSE_ASH=1 -DUSE_PANGO=1
-DUSE_CAIRO=1 -DUSE_DEFAULT_RENDER_THEME=1 -DUSE_LIBJPEG_TURBO=1 -DUSE_X11=1
-DUSE_CLIPBOARD_AURAX11=1 -DENABLE_ONE_CLICK_SIGNIN -DENABLE_WEBRTC=1
-DENABLE_MEDIA_ROUTER=1 -DUSE_PROPRIETARY_CODECS -DENABLE_PEPPER_CDMS
-DENABLE_CONFIGURATION_POLICY -DENABLE_NOTIFICATIONS -DENABLE_HIDPI=1
-DENABLE_TOPCHROME_MD=1 -DUSE_UDEV -DDONT_EMBED_BUILD_METADATA
-DFIELDTRIAL_TESTING_ENABLED -DENABLE_TASK_MANAGER=1 -DENABLE_EXTENSIONS=1
-DENABLE_PDF=1 -DENABLE_PLUGINS=1 -DENABLE_SESSION_SERVICE=1 -DENABLE_THEMES=1
-DENABLE_AUTOFILL_DIALOG=1 -DENABLE_BACKGROUND=1 -DENABLE_PRINTING=1
-DENABLE_BASIC_PRINTING=1 -DENABLE_PRINT_PREVIEW=1 -DENABLE_SPELLCHECK=1
-DENABLE_CAPTIVE_PORTAL_DETECTION=1 -DENABLE_APP_LIST=1 -DENABLE_SETTINGS_APP=1
-DENABLE_SUPERVISED_USERS=1 -DENABLE_MDNS=1 -DENABLE_SERVICE_DISCOVERY=1
-DV8_USE_EXTERNAL_STARTUP_DATA -DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD
-DSAFE_BROWSING_DB_LOCAL -DV8_TARGET_ARCH_X64 -DV8_I18N_SUPPORT
-DV8_IMMINENT_DEPRECATION_WARNINGS -DICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_FILE
-DU_USING_ICU_NAMESPACE=0 -DU_ENABLE_DYLOAD=0 -DU_STATIC_IMPLEMENTATION
-DUSE_LIBPCI=1 -DUSE_OPENSSL=1 -DUSE_GLIB=1 -DUSE_NSS_CERTS=1 -DNDEBUG
-DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -DENABLE_HANDLE_ZAPPING -I../../v8
-Igen -I../../third_party/icu/source/i18n -I../../third_party/icu/source/common
-fstack-protector --param=ssp-buffer-size=4 -pthread -fno-strict-aliasing
-Wno-unused-parameter -Wno-missing-field-initializers -fvisibility=hidden -pipe
-fPIC -Wno-unused-local-typedefs -Wno-format -Wno-unused-result -m64
-march=x86-64 -m64 -O3 -fno-ident -fdata-sections -ffunction-sections
-funwind-tables -fdata-sections -ffunction-sections -O3 -fno-exceptions
-fno-rtti -fno-threadsafe-statics -fvisibility-inlines-hidden -Wno-deprecated
-std=gnu++11 -Wno-narrowing -Wno-literal-suffix -c
../../v8/src/heap/incremental-marking.cc -o
obj/v8/src/heap/v8_base.incremental-marking.o
Compiling this file with gcc-5 fixes the issue.
I will try to narrow this further down to a single function.
