gdb --args ./mksnapshot --random-seed 314159265 --startup_blob ../../out/Debug/snapshot_blob.bin ""
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Reading symbols from ./mksnapshot...done.
(gdb) r
Starting program: /var/tmp/portage/www-client/chromium-52.0.2743.116/work/chromium-52.0.2743.116/out/Debug/mksnapshot --random-seed 314159265 --startup_blob ../../out/Debug/snapshot_blob.bin ''
Traceback (most recent call last):
  File "/usr/share/gdb/auto-load/usr/lib/gcc/x86_64-pc-linux-muslx32/4.9.3/libstdc++.so.6.0.20-gdb.py", line 59, in <module>
    from libstdcxx.v6.printers import register_libstdcxx_printers
ImportError: No module named libstdcxx.v6.printers
[New LWP 2862]


#
# Fatal error in ../../v8/src/crankshaft/x64/lithium-codegen-x64.cc, line 2960
# Check failed: key_representation.IsInteger32().
#

Thread 1 "mksnapshot" received signal SIGILL, Illegal instruction.
v8::base::OS::Abort () at ../../v8/src/base/platform/platform-posix.cc:240
240	    V8_IMMEDIATE_CRASH();
(gdb) bt
#0  v8::base::OS::Abort () at ../../v8/src/base/platform/platform-posix.cc:240
#1  0x00ed3708 in V8_Fatal (file=<optimized out>, line=2960, format=<optimized out>) at ../../v8/src/base/logging.cc:116
#2  0x0096cb4e in v8::internal::LCodeGen::BuildFastArrayOperand (this=this@entry=0xffffc870, elements_pointer=<optimized out>, key=key@entry=0x1527bb0, key_representation=...,
    elements_kind=elements_kind@entry=v8::internal::FAST_ELEMENTS, offset=offset@entry=7) at ../../v8/src/crankshaft/x64/lithium-codegen-x64.cc:2960
#3  0x00975618 in v8::internal::LCodeGen::DoStoreKeyedFixedArray (this=<optimized out>, instr=<optimized out>) at ../../v8/src/crankshaft/x64/lithium-codegen-x64.cc:4147
#4  0x00ba200a in v8::internal::LCodeGenBase::GenerateBody (this=this@entry=0xffffc870) at ../../v8/src/crankshaft/lithium-codegen.cc:107
#5  0x0097431e in v8::internal::LCodeGen::GenerateCode (this=this@entry=0xffffc870) at ../../v8/src/crankshaft/x64/lithium-codegen-x64.cc:59
#6  0x0063f427 in v8::internal::LChunk::Codegen (this=<optimized out>) at ../../v8/src/crankshaft/lithium.cc:458
#7  0x004f11d2 in v8::internal::DoGenerateCode<v8::internal::ArraySingleArgumentConstructorStub> (stub=<optimized out>) at ../../v8/src/code-stubs-hydrogen.cc:291
#8  0x004f1378 in v8::internal::ArraySingleArgumentConstructorStub::GenerateCode (this=<optimized out>) at ../../v8/src/code-stubs-hydrogen.cc:1422
#9  0x004d8dcd in v8::internal::CodeStub::GetCode (this=this@entry=0xffffcdd0) at ../../v8/src/code-stubs.cc:157
#10 0x009c06ef in v8::internal::ArrayConstructorStubAheadOfTimeHelper<v8::internal::ArraySingleArgumentConstructorStub> (isolate=0x14f8010) at ../../v8/src/x64/code-stubs-x64.cc:4058
#11 v8::internal::ArrayConstructorStubBase::GenerateStubsAheadOfTime (isolate=isolate@entry=0x14f8010) at ../../v8/src/x64/code-stubs-x64.cc:4071
#12 0x009c0861 in v8::internal::CodeStub::GenerateStubsAheadOfTime (isolate=isolate@entry=0x14f8010) at ../../v8/src/x64/code-stubs-x64.cc:1659
#13 0x006d6123 in v8::internal::Heap::CreateFixedStubs (this=this@entry=0x14f8020) at ../../v8/src/heap/heap.cc:2576
#14 0x006e3ee4 in v8::internal::Heap::CreateInitialObjects (this=this@entry=0x14f8020) at ../../v8/src/heap/heap.cc:2870
#15 0x006eea00 in v8::internal::Heap::CreateHeapObjects (this=this@entry=0x14f8020) at ../../v8/src/heap/heap.cc:5361
#16 0x00792152 in v8::internal::Isolate::Init (this=this@entry=0x14f8010, des=des@entry=0x0) at ../../v8/src/isolate.cc:2274
#17 0x004599a0 in v8::V8::CreateSnapshotDataBlob (embedded_source=embedded_source@entry=0x0) at ../../v8/src/api.cc:450
#18 0x00420afb in main (argc=2, argv=<optimized out>) at ../../v8/src/snapshot/mksnapshot.cc:164
(gdb)