Thread 1 (Thread 0x7fbf58ed3100 (LWP 25040)):
#0  __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
#1  0x00007fbf51031657 in _L_lock_909 () from /lib/x86_64-linux-gnu/libpthread.so.0
#2  0x00007fbf51031480 in __GI___pthread_mutex_lock (mutex=0x7fbf50a1ca40 <object_mutex>) at ../nptl/pthread_mutex_lock.c:79
#3  0x00007fbf508190e6 in __gthread_mutex_lock (__mutex=0x7fbf50a1ca40 <object_mutex>) at ./gthr-default.h:748
#4  _Unwind_Find_registered_FDE (bases=0x7fff5ce52658, pc=0x7fbf508176c7 <_Unwind_Backtrace+55>) at ../../../src/libgcc/unwind-dw2-fde.c:1005
#5  _Unwind_Find_FDE (pc=0x7fbf508176c7 <_Unwind_Backtrace+55>, bases=bases@entry=0x7fff5ce52658) at ../../../src/libgcc/unwind-dw2-fde-dip.c:450
#6  0x00007fbf50816524 in uw_frame_state_for (context=context@entry=0x7fff5ce525b0, fs=fs@entry=0x7fff5ce52400) at ../../../src/libgcc/unwind-dw2.c:1245
#7  0x00007fbf50816e85 in uw_init_context_1 (context=context@entry=0x7fff5ce525b0, outer_cfa=outer_cfa@entry=0x7fff5ce52860, outer_ra=0x7fbf5215fbc3 <je_prof_backtrace+35>) at ../../../src/libgcc/unwind-dw2.c:1566
#8  0x00007fbf508176c8 in _Unwind_Backtrace (trace=trace@entry=0x7fbf5215f7c0 <prof_unwind_callback>, trace_argument=trace_argument@entry=0x7fff5ce52860) at ../../../src/libgcc/unwind.inc:283
#9  0x00007fbf5215fbc3 in je_prof_backtrace (bt=bt@entry=0x7fff5ce529a0, nignore=nignore@entry=1) at src/prof.c:231
#10 0x00007fbf52137bf1 in malloc (size=size@entry=24) at src/jemalloc.c:929
#11 0x00007fbf50818978 in start_fde_sort (count=1, accu=0x7fff5ce52a50) at ../../../src/libgcc/unwind-dw2-fde.c:409
#12 init_object (ob=0x7fbf45b08610) at ../../../src/libgcc/unwind-dw2-fde.c:771
#13 search_object (ob=ob@entry=0x7fbf45b08610, pc=pc@entry=0x7fbf508176c7 <_Unwind_Backtrace+55>) at ../../../src/libgcc/unwind-dw2-fde.c:961
#14 0x00007fbf508191da in _Unwind_Find_registered_FDE (bases=0x7fff5ce52df8, pc=0x7fbf508176c7 <_Unwind_Backtrace+55>) at ../../../src/libgcc/unwind-dw2-fde.c:1025
#15 _Unwind_Find_FDE (pc=0x7fbf508176c7 <_Unwind_Backtrace+55>, bases=bases@entry=0x7fff5ce52df8) at ../../../src/libgcc/unwind-dw2-fde-dip.c:450
#16 0x00007fbf50816524 in uw_frame_state_for (context=context@entry=0x7fff5ce52d50, fs=fs@entry=0x7fff5ce52ba0) at ../../../src/libgcc/unwind-dw2.c:1245
#17 0x00007fbf50816e85 in uw_init_context_1 (context=context@entry=0x7fff5ce52d50, outer_cfa=outer_cfa@entry=0x7fff5ce53000, outer_ra=0x7fbf5215fbc3 <je_prof_backtrace+35>) at ../../../src/libgcc/unwind-dw2.c:1566
#18 0x00007fbf508176c8 in _Unwind_Backtrace (trace=trace@entry=0x7fbf5215f7c0 <prof_unwind_callback>, trace_argument=trace_argument@entry=0x7fff5ce53000) at ../../../src/libgcc/unwind.inc:283
#19 0x00007fbf5215fbc3 in je_prof_backtrace (bt=bt@entry=0x7fff5ce53140, nignore=nignore@entry=1) at src/prof.c:231
#20 0x00007fbf52137bf1 in malloc (size=<optimized out>) at src/jemalloc.c:929
#21 0x00000000010876f5 in HPHP::jit::(anonymous namespace)::Variable::create (r=...) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/vm/jit/vasm-xls.cpp:435
#22 0x000000000109e62d in def (wide=false, hint=..., kind=HPHP::jit::(anonymous namespace)::Any, r=..., this=0x7fff5ce534a0) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/vm/jit/vasm-xls.cpp:875
#23 def (r=..., this=0x7fff5ce534a0) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/vm/jit/vasm-xls.cpp:859
#24 operator() (r=..., __closure=<synthetic pointer>) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/vm/jit/vasm-xls.cpp:861
#25 forEach<HPHP::jit::(anonymous namespace)::DefVisitor::def(HPHP::jit::RegSet)::__lambda93> (f=..., this=<synthetic pointer>) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/vm/jit/phys-reg.h:378
#26 def (rs=..., this=0x7fff5ce534a0) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/vm/jit/vasm-xls.cpp:861
#27 buildIntervals (ctx=..., unit=...) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/vm/jit/vasm-xls.cpp:1009
#28 HPHP::jit::allocateRegisters (unit=..., abi=...) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/vm/jit/vasm-xls.cpp:2769
#29 0x0000000001282241 in HPHP::jit::optimizeX64 (unit=..., abi=...) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/vm/jit/vasm-x64.cpp:894
#30 0x0000000001181cc9 in HPHP::jit::Vauto::~Vauto (this=0x7fff5ce53b50, __in_chrg=<optimized out>) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/vm/jit/vasm-gen.cpp:87
#31 0x000000000122310c in vwrap<HPHP::jit::x64::emitFreeLocalsHelpers(HPHP::CodeBlock&, HPHP::jit::UniqueStubs&)::__lambda98> (kind=HPHP::jit::CrossTrace, gen=..., cb=...) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/vm/jit/vasm-gen.h:181
#32 HPHP::jit::x64::emitFreeLocalsHelpers (cb=..., us=...) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/vm/jit/unique-stubs-x64.cpp:239
#33 0x0000000001024100 in emitFreeLocalsHelpers (us=..., cb=...) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/vm/jit/unique-stubs.cpp:136
#34 HPHP::jit::UniqueStubs::emitAll (this=this@entry=0x7fbf48bcafb8) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/vm/jit/unique-stubs.cpp:859
#35 0x000000000104f987 in HPHP::jit::MCGenerator::initUniqueStubs (this=this@entry=0x7fbf48bcac00) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/vm/jit/mc-generator.cpp:2164
#36 0x0000000000bf1ce5 in HPHP::ProcessInit () at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/hhvm/process-init.cpp:72
#37 0x0000000000ca7fac in HPHP::hphp_process_init () at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/base/program-functions.cpp:1944
#38 0x0000000000cb3a60 in HPHP::execute_program_impl (argc=argc@entry=6, argv=argv@entry=0x7fff5ce56270) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/base/program-functions.cpp:1657
#39 0x0000000000cb58af in HPHP::execute_program (argc=6, argv=argv@entry=0x7fff5ce56270) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/base/program-functions.cpp:1040
#40 0x0000000000d352e0 in HPHP::emulate_zend (argc=argc@entry=3, argv=argv@entry=0x7fff5ce566e0) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/runtime/base/emulate-zend.cpp:273
#41 0x0000000000bf1a30 in main (argc=<optimized out>, argv=0x7fff5ce566d8) at /tmp/buildd/hhvm-3.12.1+dfsg/hphp/hhvm/main.cpp:55