#0  HPHP::BigHeap::freeBig (this=0x7fde75bfbfc8, ptr=0x7fdc9853ce90) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/memory-manager.cpp:1240
#1  0x00007fdf363e00ad in ?? () from /usr/lib/x86_64-linux-gnu/hhvm/extensions/20150212/luasandbox.so
#2  0x00007fdf361b6fde in luaM_realloc_ (L=L@entry=0x7fdd82612e90, block=<optimized out>, osize=320, nsize=nsize@entry=0) at lmem.c:79
#3  0x00007fdf361bb388 in luaH_free (L=L@entry=0x7fdd82612e90, t=t@entry=0x7fdca04bae70) at ltable.c:376
#4  0x00007fdf361b4b55 in freeobj (o=0x7fdca04bae70, L=0x7fdd82612e90) at lgc.c:383
#5  sweeplist (L=L@entry=0x7fdd82612e90, p=p@entry=0x7fdd82612f70, count=18446744073709463959, count@entry=18446744073709551613) at lgc.c:424
#6  0x00007fdf361b5911 in luaC_freeall (L=L@entry=0x7fdd82612e90) at lgc.c:487
#7  0x00007fdf361ba61e in close_state (L=0x7fdd82612e90) at lstate.c:108
#8  0x00007fdf363e6c18 in ?? () from /usr/lib/x86_64-linux-gnu/hhvm/extensions/20150212/luasandbox.so
#9  0x0000000001d37681 in HPHP::ZendObjectStore::freeObject (this=0x7fde394e45b0, handle=101)
    at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/ext_zend_compat/hhvm/zend-object-store.cpp:76
#10 0x00000000012df5d1 in HPHP::Native::nativeDataInstanceDtor (obj=0x7fdd0eb7a860, cls=<optimized out>)
    at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/vm/native-data.cpp:138
#11 0x0000000001d099e2 in tvDecRefHelper (datum=<optimized out>, type=<optimized out>) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/tv-helpers.h:175
#12 tvDecRef (tv=<optimized out>, tv=<optimized out>) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/tv-helpers.h:206
#13 tvRefcountedDecRef (tv=<optimized out>) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/tv-helpers.h:212
#14 ~Variant (this=0x7fdccc5e5188, __in_chrg=<optimized out>) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/type-variant.h:335
#15 ~RefData (this=0x7fdccc5e5180, __in_chrg=<optimized out>) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/type-variant.h:1509
#16 release (this=0x7fdccc5e5180) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/ref-data.h:100
#17 decRefAndRelease (this=0x7fdccc5e5180) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/ref-data.h:108
#18 decRefRef (ref=0x7fdccc5e5180) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/ref-data.h:269
#19 _zval_ptr_dtor (zval_ptr=<optimized out>) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/ext_zend_compat/php-src/Zend/zend_variables.cpp:55
#20 0x00007fdf363e58af in ?? () from /usr/lib/x86_64-linux-gnu/hhvm/extensions/20150212/luasandbox.so
#21 0x0000000001d37681 in HPHP::ZendObjectStore::freeObject (this=0x7fde394e45b0, handle=67)
    at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/ext_zend_compat/hhvm/zend-object-store.cpp:76
#22 0x00000000012df5d1 in HPHP::Native::nativeDataInstanceDtor (obj=0x7fddad0729e0, cls=<optimized out>)
    at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/vm/native-data.cpp:138
#23 0x0000000002129e88 in tvDecRefHelper (datum=<optimized out>, type=<optimized out>) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/tv-helpers.h:175
#24 tvDecRef (tv=<optimized out>, tv=<optimized out>) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/tv-helpers.h:206
#25 tvRefcountedDecRef (tv=0x7fde20e76648) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/tv-helpers.h:212
#26 HPHP::ObjectData::releaseNoObjDestructCheck (this=0x7fde20e76600) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/object-data.cpp:171
#27 0x000000000212945a in tvDecRefHelper (datum=<optimized out>, type=<optimized out>) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/tv-helpers.h:175
#28 tvDecRef (tv=<optimized out>, tv=<optimized out>) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/tv-helpers.h:206
#29 tvRefcountedDecRef (tv=0x7fdd86187628) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/tv-helpers.h:212
#30 HPHP::MixedArray::Release (in=0x7fdd86186a00) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/mixed-array.cpp:489
#31 0x0000000002130882 in tvDecRefHelper (datum=<optimized out>, type=<optimized out>) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/tv-helpers.h:175
#32 tvRefcountedDecRefHelper (datum=<optimized out>, type=<optimized out>) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/tv-helpers.h:182
#33 tvSet (inTo=..., fr=...) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/tv-helpers.h:393
#34 HPHP::ObjectData::setProp (this=0x7fde7187f360, ctx=<optimized out>, key=0x7fdf2c211880, val=val@entry=0x7fde75bfa8c0,
    bindingAssignment=bindingAssignment@entry=false) at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/base/object-data.cpp:1361
#35 0x00000000016b6ee5 in SetPropObj<(HPHP::KeyType)2> (val=0x7fde75bfa8c0, key=<optimized out>, instance=<optimized out>, ctx=<optimized out>)
    at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/vm/member-operations.h:2850
#36 HPHP::jit::MInstrHelpers::setPropCOS (ctx=<optimized out>, base=<optimized out>, key=<optimized out>, val={ HPHP::KindOfNull })
    at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/vm/jit/minstr-helpers.h:291
#37 0x00000000043497ba in ?? ()
#38 0x00007fde71aff1b0 in ?? ()
#39 0x00000000047d465c in ?? ()
#40 0x00007fde71aff1e0 in ?? ()
#41 0x00000000047d44cc in ?? ()
#42 0x00007fde71aff220 in ?? ()
#43 0x00000000040910a6 in ?? ()
#44 0x00007fde71aff350 in ?? ()
#45 0x0000000004884c9e in ?? ()
#46 0x00007fde71aff3a0 in ?? ()
#47 0x0000000004d9343c in ?? ()
#48 0x00007fde71aff410 in ?? ()
#49 0x0000000004d931f1 in ?? ()
#50 0x00007fde71aff5d0 in ?? ()
#51 0x0000000004d14df2 in ?? ()
#52 0x00007fde71aff7b0 in ?? ()
#53 0x0000000004091376 in ?? ()
#54 0x00007fde71aff8f0 in ?? ()
#55 0x0000000004ce3a9f in ?? ()
#56 0x00007fde71aff940 in ?? ()
#57 0x0000000004ce16fc in ?? ()
#58 0x00007fde71affaf0 in ?? ()
#59 0x00000000048e4054 in ?? ()
#60 0x00007fde71affbe0 in ?? ()
#61 0x0000000004629227 in ?? ()
#62 0x000000000400004f in ?? ()
#63 0x00007fdd84c2ebf0 in ?? ()
#64 0x00007fde75bfa9f0 in ?? ()
#65 0x0000000001772a84 in HPHP::jit::enterTCImpl (start=<optimized out>, stashedAR=<optimized out>)
    at /tmp/buildd/hhvm-3.18.2+dfsg/hphp/runtime/vm/jit/unique-stubs.cpp:1421
Backtrace stopped: previous frame inner to this frame (corrupt stack?)