ASAN report is

=================================================================
==1==ERROR: AddressSanitizer: heap-use-after-free on address 0x62a000073c80 at pc 0x7f9636bb72a4 bp 0x7ffc62590270 sp 0x7ffc62590268
READ of size 8 at 0x62a000073c80 thread T0 (chrome)
==1==WARNING: invalid path to external symbolizer!
==1==WARNING: Failed to use and restart external symbolizer!
    #0 0x7f9636bb72a3 in Enter v8/src/isolate.cc:2441:45
    #1 0x7f9637bd2bd7 in Scope v8/include/v8.h:5630:16
    #2 0x7f9637bd2bd7 in Scope gin/runner.cc:16:0
    #3 0x7f963c1b80b3 in OnHandleReady mojo/edk/js/waiting_callback.cc:72:22
    #4 0x7f963a5f8ef2 in Run base/callback.h:389:12
    #5 0x7f963a5f8ef2 in OnHandleReady mojo/public/cpp/system/watcher.cc:122:0
    #6 0x7f963a5f8ef2 in WillDestroyCurrentMessageLoop mojo/public/cpp/system/watcher.cc:32:0
    #7 0x7f96421e241f in ~MessageLoop base/message_loop/message_loop.cc:174:3
    #8 0x7f96421dcc7d in ?? base/message_loop/message_loop.cc:139:29
    #9 0x7f963bdf33a0 in operator() buildtools/third_party/libc++/trunk/include/memory:2529:13
    #10 0x7f963bdf33a0 in reset buildtools/third_party/libc++/trunk/include/memory:2735:0
    #11 0x7f963bdf33a0 in Shutdown content/renderer/render_thread_impl.cc:1009:0
    #12 0x7f963a030e78 in ~ChildProcess content/child/child_process.cc:73:19
    #13 0x7f963be81956 in RendererMain content/renderer/renderer_main.cc:207:3
    #14 0x7f963c1bd515 in RunZygote content/app/content_main_runner.cc:343:14
    #15 0x7f963c1c037d in Run content/app/content_main_runner.cc:785:12
    #16 0x7f963c1bc7ba in ContentMain content/app/content_main.cc:20:28
    #17 0x7f96439b5208 in ChromeMain chrome/app/chrome_main.cc:85:12
    #18 0x7f962b982f44 in __libc_start_main /build/eglibc-oGUzwX/eglibc-2.19/csu/libc-start.c:287:0

0x62a000073c80 is located 6784 bytes inside of 22440-byte region [0x62a000072200,0x62a0000779a8)
freed by thread T0 (chrome) here:
    #0 0x7f96439b348b in operator delete(void*) ??:?
    #1 0x7f9636bb20a3 in TearDown v8/src/isolate.cc:1992:3
    #2 0x7f9637bb8ebc in ~IsolateHolder gin/isolate_holder.cc:75:13
    #3 0x7f9625c950fa in operator() buildtools/third_party/libc++/trunk/include/memory:2529:13
    #4 0x7f9625c950fa in reset buildtools/third_party/libc++/trunk/include/memory:2735:0
    #5 0x7f9625c950fa in ~unique_ptr buildtools/third_party/libc++/trunk/include/memory:2703:0
    #6 0x7f9625c950fa in ~V8PerIsolateData third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp:78:0
    #7 0x7f9625c95b17 in destroy third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp:257:5
    #8 0x7f9631f7a14c in shutdown third_party/WebKit/Source/web/WebKit.cpp:114:5
    #9 0x7f963bdf3348 in Shutdown content/renderer/render_thread_impl.cc:998:5
    #10 0x7f963a030e78 in ~ChildProcess content/child/child_process.cc:73:19
    #11 0x7f963be81956 in RendererMain content/renderer/renderer_main.cc:207:3
    #12 0x7f963c1bd515 in RunZygote content/app/content_main_runner.cc:343:14
    #13 0x7f963c1c037d in Run content/app/content_main_runner.cc:785:12
    #14 0x7f963c1bc7ba in ContentMain content/app/content_main.cc:20:28
    #15 0x7f96439b5208 in ChromeMain chrome/app/chrome_main.cc:85:12
    #16 0x7f962b982f44 in __libc_start_main /build/eglibc-oGUzwX/eglibc-2.19/csu/libc-start.c:287:0

previously allocated by thread T0 (chrome) here:
    #0 0x7f96439b2e8b in operator new(unsigned long) ??:?
    #1 0x7f9635f9bc07 in New v8/src/api.cc:7477:25
    #2 0x7f9637bb8b65 in IsolateHolder gin/isolate_holder.cc:43:14
    #3 0x7f9625c945e2 in V8PerIsolateData third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp:58:38
    #4 0x7f9625c9544f in initialize third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp:88:34
    #5 0x7f9625c7bfcc in initializeMainThread third_party/WebKit/Source/bindings/core/v8/V8Initializer.cpp:362:28
    #6 0x7f9631f79cc3 in initialize third_party/WebKit/Source/web/WebKit.cpp:87:5
    #7 0x7f963bdec3b7 in InitializeWebKit content/renderer/render_thread_impl.cc:1197:3
    #8 0x7f963bde854b in Init content/renderer/render_thread_impl.cc:660:3
    #9 0x7f963bde793f in RenderThreadImpl content/renderer/render_thread_impl.cc:634:3
    #10 0x7f963bde7294 in Create content/renderer/render_thread_impl.cc:599:14
    #11 0x7f963be8180d in RendererMain content/renderer/renderer_main.cc:186:5
    #12 0x7f963c1bd515 in RunZygote content/app/content_main_runner.cc:343:14
    #13 0x7f963c1c037d in Run content/app/content_main_runner.cc:785:12
    #14 0x7f963c1bc7ba in ContentMain content/app/content_main.cc:20:28
    #15 0x7f96439b5208 in ChromeMain chrome/app/chrome_main.cc:85:12
    #16 0x7f962b982f44 in __libc_start_main /build/eglibc-oGUzwX/eglibc-2.19/csu/libc-start.c:287:0

SUMMARY: AddressSanitizer: heap-use-after-free (/usr/local/google/home/eisinger/blink/src/out/Release/./libv8.so+0x10112a3)
Shadow bytes around the buggy address:
  0x0c5480006740: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c5480006750: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c5480006760: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c5480006770: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c5480006780: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
=>0x0c5480006790:[fd]fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c54800067a0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c54800067b0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c54800067c0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c54800067d0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c54800067e0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==1==ABORTING