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  1. I've gotten a couple different traces:
  2.  
  3. #0 HPHP::ClassScope::TMIOps::addTraitAlias (cs=0x7fffb93f62f0, stmt=std::shared_ptr (count -1187028272, weak 32766) 0x7fffb93f6058,
  4. traitCls=<error reading variable: Cannot access memory at address 0x646574636570784d>)
  5. at /home/andrewkl/hhvm/hphp/compiler/analysis/class_scope.cpp:524
  6. #1 0x000000000644df7b in std::_Hashtable<unsigned long, std::pair<unsigned long const, long>, std::allocator<std::pair<unsigned long const, long> >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >::_M_insert_unique_node (this=0x7fffb93f62d0,
  7. __bkt=66, __code=1047972020383, __node=0x7fffbfdfe120)
  8. at /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../include/c++/4.8.5/bits/hashtable.h:1339
  9. #2 0x000000000644a975 in std::__detail::_Map_base<unsigned long, std::pair<unsigned long const, long>, std::allocator<std::pair<unsigned long const, long> >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, true>::operator[] (this=0x7fffb93f62d0,
  10. __k=@0x7fffb93f6058: 1047972020383) at /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../include/c++/4.8.5/bits/hashtable_policy.h:496
  11. #3 0x00000000064491bb in std::unordered_map<unsigned long, long, std::hash<unsigned long>, std::equal_to<unsigned long>, std::allocator<std::pair<unsigned long const, long> > >::operator[] (this=0x7fffb93f62d0, __k=@0x7fffb93f6058: 1047972020383)
  12. at /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../include/c++/4.8.5/bits/unordered_map.h:596
  13. #4 0x00000000064463ef in HPHP::jit::(anonymous namespace)::Scale::computeArcWeights (this=0x7fffb93f6280)
  14. at /home/andrewkl/hhvm/hphp/runtime/vm/jit/vasm-layout.cpp:189
  15. #5 0x0000000006446738 in HPHP::jit::(anonymous namespace)::Scale::computeWeights (this=0x7fffb93f6280)
  16. at /home/andrewkl/hhvm/hphp/runtime/vm/jit/vasm-layout.cpp:203
  17. #6 0x0000000006445e0a in HPHP::jit::(anonymous namespace)::Scale::Scale (this=0x7fffb93f6280, unit=...)
  18. at /home/andrewkl/hhvm/hphp/runtime/vm/jit/vasm-layout.cpp:107
  19. #7 0x0000000006448740 in HPHP::jit::(anonymous namespace)::pgoLayout (unit=..., text=...)
  20. at /home/andrewkl/hhvm/hphp/runtime/vm/jit/vasm-layout.cpp:461
  21. #8 0x0000000006448c71 in HPHP::jit::layoutBlocks (unit=..., text=...) at /home/andrewkl/hhvm/hphp/runtime/vm/jit/vasm-layout.cpp:500
  22. #9 0x00000000065e0e74 in HPHP::jit::vasm_emit<HPHP::jit::(anonymous namespace)::Vgen> (unit=..., text=..., fixups=..., asm_info=0x0)
  23. at /home/andrewkl/hhvm/hphp/runtime/vm/jit/vasm-internal-inl.h:170
  24. #10 0x00000000065df25b in HPHP::jit::emitX64 (unit=..., text=..., fixups=..., asmInfo=0x0)
  25. at /home/andrewkl/hhvm/hphp/runtime/vm/jit/vasm-x64.cpp:1076
  26. #11 0x00000000063edfe5 in HPHP::jit::(anonymous namespace)::emit (vunit=..., vtext=..., meta=..., ai=0x0)
  27. at /home/andrewkl/hhvm/hphp/runtime/vm/jit/vasm-emit.cpp:111
  28. ---Type <return> to continue, or q <return> to quit---
  29. #12 0x00000000063ee555 in HPHP::jit::emitVunit (vunit=..., unit=..., code=..., meta=..., annotations=0x7fffb93fa1f8)
  30. at /home/andrewkl/hhvm/hphp/runtime/vm/jit/vasm-emit.cpp:193
  31. #13 0x000000000629050d in HPHP::jit::tc::(anonymous namespace)::mcGenUnit (env=..., codeView=..., fixups=...)
  32. at /home/andrewkl/hhvm/hphp/runtime/vm/jit/tc-region.cpp:67
  33. #14 0x0000000006292e06 in HPHP::jit::tc::emitTranslation (env=..., optDst=...) at /home/andrewkl/hhvm/hphp/runtime/vm/jit/tc-region.cpp:415
  34. #15 0x000000000601ddd2 in HPHP::jit::mcgen::translate (args=..., spOff=..., optView=...)
  35. at /home/andrewkl/hhvm/hphp/runtime/vm/jit/mcgen-translate.cpp:408
  36. #16 0x000000000601b9e9 in HPHP::jit::mcgen::(anonymous namespace)::optimize (func=0x7fffe6a7f380, localBuf=0x0)
  37. at /home/andrewkl/hhvm/hphp/runtime/vm/jit/mcgen-translate.cpp:79
  38. #17 0x000000000601bedc in HPHP::jit::mcgen::(anonymous namespace)::TranslateWorker::doJob (this=0x7fffc5d0ed30, d=0x7fffbe816000)
  39. at /home/andrewkl/hhvm/hphp/runtime/vm/jit/mcgen-translate.cpp:114
  40. #18 0x0000000006024ac0 in HPHP::JobQueueWorker<HPHP::jit::mcgen::(anonymous namespace)::OptimizeData*, void*, true, true, HPHP::detail::NoDropCachePolicy>::start (this=0x7fffc5d0ed30) at /home/andrewkl/hhvm/hphp/util/job-queue.h:463
  41. #19 0x000000000473e1d0 in HPHP::AsyncFunc<HPHP::AsyncFileCacheSaver>::run_ (obj=0x7fffc4834a00) at /home/andrewkl/hhvm/hphp/util/async-func.h:203
  42. #20 0x00000000049fcbdb in HPHP::AsyncFuncImpl::threadFuncImpl (this=0x7fffc4834a00) at /home/andrewkl/hhvm/hphp/util/async-func.cpp:139
  43. #21 0x00000000049fc7ad in HPHP::AsyncFuncImpl::ThreadFunc (obj=0x7fffc4834a00) at /home/andrewkl/hhvm/hphp/util/async-func.cpp:57
  44. #22 0x000000000504ab35 in HPHP::start_routine_wrapper (arg=0x7fffbf7f19c0) at /home/andrewkl/hhvm/hphp/runtime/base/thread-hooks.cpp:105
  45. #23 0x00007ffff5e2edc5 in start_thread () from /lib64/libpthread.so.0
  46. #24 0x00007fffef26e73d in clone () from /lib64/libc.so.6
  47.  
  48. #0 HPHP::Func::getFuncId (this=0x7fffbd7fa5f0) at /home/andrewkl/hhvm/hphp/runtime/vm/func-inl.h:87
  49. #1 0x000000000601aefb in HPHP::jit::tc::FuncMetaInfo::FuncMetaInfo(HPHP::Func*, HPHP::jit::tc::ThreadTCBuffer&&) (this=0x7fffbd7fa970,
  50. f=0x7fffe6ab3e80, buf=<unknown type in /home/andrewkl/hhvm/hphp/hhvm/hhvm, CU 0x1da1f752, DIE 0x1dbdcf57>)
  51. at /home/andrewkl/hhvm/hphp/runtime/vm/jit/tc.h:97
  52. #2 0x000000000601b741 in HPHP::jit::mcgen::(anonymous namespace)::optimize (func=0x7fffe6ab3e80,
  53. localBuf=0x4100000 "llocatorIN8facebook8memcache19MemcacheRouteHandleINS2_16AllMajorityRouteINS2_21MemcacheRouteHandleIfEEEEEED1Ev")
  54. at /home/andrewkl/hhvm/hphp/runtime/vm/jit/mcgen-translate.cpp:56
  55. #3 0x000000000601bedc in HPHP::jit::mcgen::(anonymous namespace)::TranslateWorker::doJob (this=0x7fffc4799460, d=0x7fffc44efb60)
  56. at /home/andrewkl/hhvm/hphp/runtime/vm/jit/mcgen-translate.cpp:114
  57. #4 0x0000000006024ac0 in HPHP::JobQueueWorker<HPHP::jit::mcgen::(anonymous namespace)::OptimizeData*, void*, true, true, HPHP::detail::NoDropCachePolicy>::start (this=0x7fffc4799460) at /home/andrewkl/hhvm/hphp/util/job-queue.h:463
  58. #5 0x000000000473e1d0 in HPHP::AsyncFunc<HPHP::AsyncFileCacheSaver>::run_ (obj=0x7fffbf2c4900) at /home/andrewkl/hhvm/hphp/util/async-func.h:203
  59. #6 0x00000000049fcbdb in HPHP::AsyncFuncImpl::threadFuncImpl (this=0x7fffbf2c4900) at /home/andrewkl/hhvm/hphp/util/async-func.cpp:139
  60. #7 0x00000000049fc7ad in HPHP::AsyncFuncImpl::ThreadFunc (obj=0x7fffbf2c4900) at /home/andrewkl/hhvm/hphp/util/async-func.cpp:57
  61. #8 0x000000000504ab35 in HPHP::start_routine_wrapper (arg=0x7fffbf1368e0) at /home/andrewkl/hhvm/hphp/runtime/base/thread-hooks.cpp:105
  62. #9 0x00007ffff5e2edc5 in start_thread (arg=0x7fffbd7ff700) at pthread_create.c:308
  63. #10 0x00007fffef26e73d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
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