Hey,
I'm hoping someone with more experience than me can shed some light on my
issue.
v8 is being run on a separate thread to the main thread, all interactions
with v8 occur on this thread
The problem is that when an action (playing/pausing a film in android's
MediaPlayer) occurs on the main thread, the app has a high chance of
crashing either straight away or after a short period (can be as high as
600ms).
The crash is always the same (with differing address(:
signal 11 (SIGSEGV), code 2 (SEGV_ACCERR), fault addr 0x45524854
Although occasionally SEGV_ACCERR might be SEGV_MAPERR.
Stack frame #00 pc 0061d3ec /[...]/lib/arm/libnative_webgl.so
(v8::internal::AstValueFactory::Internalize(v8::internal::Isolate*)+56)
SEGV_ACCERR and SEGV_MAPERR surely imply that the v8 thread is accessing
data on another thread, but as far as my code is concerned, nothing
interesting is happening when the crash occurs and if there are any calls
to js land they're happening on the thread v8 was created with.
The code for AstValueFactory::Internalize is
void AstValueFactory::Internalize(Isolate* isolate) {
if (isolate_) {
// Everything is already internalized.
return;
}
// Strings need to be internalized before values, because values refer to
// strings.
for (int i = 0; i < strings_.length(); ++i) {
strings_[i]->Internalize(isolate);
}
for (int i = 0; i < values_.length(); ++i) {
values_[i]->Internalize(isolate);
}
isolate_ = isolate;
}
Do you have any thoughts about what could cause this? If the media player
action is corrupting memory in some way, is there some reason that it
always crashes on this particular function?
I'm using v8 3.2.8 on Android (via NDK). (unfortunately upgrading to more
recent v8 isn't an option).
v8::Locker is used before every handle_scope, should I be doing something
else to ensure thread safety?
Been on this problem for a long time now, any insight someone might have
will be useful.
Thanks,
George Corney
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