Status: New
Owner: ----
New issue 3694 by [email protected]: Segmentation fault in
CopyCharsUnsigned() with g++ 4.9.2
https://code.google.com/p/v8/issues/detail?id=3694
The current implementation of CopyCharsUnsigned() in src/utils.h makes
x86_64 g++ 4.9.2 emit movdqa instructions for unaligned addresses.
I'm not entirely sure if g++ is to blame here or if there is a pointer
aliasing bug in V8 but replacing this line:
while (dest < limit) *dest++ = static_cast<sinkchar>(*src++);
With a byte-for-byte copy fixes the issue.
I've only seen the SIGSEGV happen in calls to
Factory::NewStringFromTwoByte() and only with a source and destination of
type uint16_t.
Tested with the current HEAD and v3.29.93.1.
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