Use of variables + for loop + switch in a generator function causes inspector to crash

Version: 7.6.0
Platform: Darwin Matthews-MBP-2.lan 16.3.0 Darwin Kernel Version 16.3.0: Thu Nov 17 20:23:58
Subsystem: Unknown

I was able to reduce it down to this code:

tcase.js

function* serialize() {
  for(let i = 0; i < 10; i++) {
    let value;
    let section = {};

    debugger;

    switch('foo') {
      case 'bar':
        let items = [];
        break;
    }
  }
}

let gen = serialize();
gen.next();

Run with node --debug-brk --inspect tcase.js. Stop on the debugger and then click to step over. It will crash with 1] 50320 illegal hardware instruction node --debug-brk --inspect tcase.js.

I dumped the output into this gist.

I can reproduce on master

Backtrace with a debug build:

(gdb) bt
#0  v8::base::OS::Abort () at ../deps/v8/src/base/platform/platform-posix.cc:230
#1  0x00000000026fb2b7 in V8_Fatal (file=0x293a348 "../deps/v8/src/debug/debug-scopes.cc", line=257, format=0x293983a "Check failed: %s.") at ../deps/v8/src/base/logging.cc:67
#2  0x0000000001cc562f in v8::internal::ScopeIterator::Type (this=0x7fffffffa4f0) at ../deps/v8/src/debug/debug-scopes.cc:257
#3  0x0000000001cc4d5f in v8::internal::ScopeIterator::MaterializeScopeDetails (this=0x7fffffffa4f0) at ../deps/v8/src/debug/debug-scopes.cc:179
#4  0x000000000210307a in v8::internal::__RT_impl_Runtime_GetAllScopesDetails (args=..., isolate=0x3863600) at ../deps/v8/src/runtime/runtime-debug.cc:886
#5  0x0000000002102ca7 in v8::internal::Runtime_GetAllScopesDetails (args_length=4, args_object=0x7fffffffaa48, isolate=0x3863600) at ../deps/v8/src/runtime/runtime-debug.cc:861
#6  0x0000273d428843a7 in ?? ()
#7  0x0000273d429dfa8e in ?? ()
#8  0x0000273d428842e1 in ?? ()
#9  0x00007fffffffaa00 in ?? ()
#10 0x0000000300000000 in ?? ()
#11 0x00007fffffffaa78 in ?? ()
#12 0x0000273d429df5f5 in ?? ()
#13 0x0000140895d02421 in ?? ()
#14 0x0000000000000000 in ?? ()

Will take a look.

I can reproduce this in d8. File V8 bug here: https://bugs.chromium.org/p/v8/issues/detail?id=6085

Fix upcoming.

https://chromium.googlesource.com/v8/v8.git/+/09de9969ccb9bc3bbd667788afad665b309d02f5

deps: cherry-pick 09de996 from V8 upstream

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Use of variables + for loop + switch in a generator function causes inspector to crash #11746

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Use of variables + for loop + switch in a generator function causes inspector to crash #11746

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targos commented on Mar 8, 2017

targos commented on Mar 8, 2017

hashseed commented on Mar 10, 2017

hashseed commented on Mar 13, 2017

hashseed commented on Mar 13, 2017

hashseed commented on Mar 13, 2017

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