MAYBE
Errors:
Stacktrace:

  at <unknown> <0xffffffff>
  at (wrapper managed-to-native) Microsoft.Z3.Native/LIB.Z3_fixedpoint_dec_ref (intptr,intptr) [0x00002] in <1589d34e42ba4cbeb3351b894afd3b19>:0
  at Microsoft.Z3.Native.Z3_fixedpoint_dec_ref (intptr,intptr) [0x00001] in <1589d34e42ba4cbeb3351b894afd3b19>:0
  at Microsoft.Z3.Fixedpoint/DecRefQueue.DecRef (Microsoft.Z3.Context,intptr) [0x00007] in <1589d34e42ba4cbeb3351b894afd3b19>:0
  at Microsoft.Z3.IDecRefQueue.Clear (Microsoft.Z3.Context) [0x0002b] in <1589d34e42ba4cbeb3351b894afd3b19>:0
  at Microsoft.Z3.Context.Dispose () [0x000bd] in <1589d34e42ba4cbeb3351b894afd3b19>:0
  at Microsoft.Research.T2.MuZ/MuZWrapper.CallSpacer (System.Collections.Generic.Dictionary`2<int, Microsoft.Z3.FuncDecl>,Microsoft.FSharp.Collections.FSharpList`1<System.Tuple`2<Microsoft.Z3.Quantifier, Microsoft.Z3.StringSymbol>>,Microsoft.Z3.BoolExpr) [0x0014d] in <597f493e96b5f0a0a74503833e497f59>:0
  at Microsoft.Research.T2.MuZ/MuZWrapper.Microsoft-Research-T2-SafetyInterface-SafetyProver-ErrorLocationReachable () [0x000c5] in <597f493e96b5f0a0a74503833e497f59>:0
  at Microsoft.Research.T2.Termination.prover<a_REF> (Microsoft.Research.T2.Parameters/parameters,Microsoft.Research.T2.Programs/Program,Microsoft.Research.T2.CTL/CTL_Formula,bool,Microsoft.Research.T2.Utils/SetDictionary`2<Microsoft.Research.T2.CTL/CTL_Formula, System.Tuple`2<int, Microsoft.Research.T2.Formula/formula>>,Microsoft.FSharp.Core.FSharpOption`1<System.Tuple`2<Microsoft.Research.T2.Formula/formula, Microsoft.Research.T2.Formula/formula>>,bool,bool,bool) [0x0037a] in <597f493e96b5f0a0a74503833e497f59>:0
  at Microsoft.Research.T2.Termination.bottomUp<a_REF> (Microsoft.Research.T2.Parameters/parameters,Microsoft.Research.T2.Programs/Program,Microsoft.Research.T2.CTL/CTL_Formula,bool,int,Microsoft.FSharp.Core.FSharpOption`1<System.Tuple`2<Microsoft.Research.T2.Formula/formula, Microsoft.Research.T2.Formula/formula>>,Microsoft.Research.T2.Utils/SetDictionary`2<Microsoft.Research.T2.CTL/CTL_Formula, System.Tuple`2<int, Microsoft.Research.T2.Formula/formula>>) [0x0029e] in <597f493e96b5f0a0a74503833e497f59>:0
  at Microsoft.Research.T2.Termination.bottomUpProver (Microsoft.Research.T2.Parameters/parameters,Microsoft.Research.T2.Programs/Program,Microsoft.Research.T2.CTL/CTL_Formula,bool,Microsoft.FSharp.Core.FSharpOption`1<System.Tuple`2<Microsoft.Research.T2.Formula/formula, Microsoft.Research.T2.Formula/formula>>) [0x000c2] in <597f493e96b5f0a0a74503833e497f59>:0
  at Microsoft.Research.T2.Main.main$cont@113-1 (Microsoft.Research.T2.Arguments/runMode,Microsoft.Research.T2.Parameters/parameters,string,Microsoft.Research.T2.Programs/Program,Microsoft.FSharp.Core.Unit) [0x00071] in <597f4945c11a1123a745038345497f59>:0
  at Microsoft.Research.T2.Main.main (string[]) [0x00261] in <597f4945c11a1123a745038345497f59>:0
  at (wrapper runtime-invoke) <Module>.runtime_invoke_int_object (object,intptr,intptr,intptr) [0x00054] in <597f4945c11a1123a745038345497f59>:0
/proc/self/maps:
00400000-00aec000 r-xp 00000000 fd:02 29753357                           /export/starexec/sandbox/solver/bin/T2_static
00ceb000-00cf0000 r-xp 006eb000 fd:02 29753357                           /export/starexec/sandbox/solver/bin/T2_static
00cf0000-00cf3000 rwxp 006f0000 fd:02 29753357                           /export/starexec/sandbox/solver/bin/T2_static
00cf3000-00d27000 rwxp 00000000 00:00 0 
010aa000-043e1000 rwxp 00000000 00:00 0                                  [heap]
4143a000-415ad000 rwxp 00000000 00:00 0 
41a5b000-41a6b000 rwxp 00000000 00:00 0 
2ab881ee1000-2ab881f03000 r-xp 00000000 fd:01 530934                     /usr/lib64/ld-2.17.so
2ab881f03000-2ab881f04000 rwxp 00000000 00:00 0 
2ab881f04000-2ab881f05000 rwxs 00000000 00:13 201374017                  /dev/shm/mono.53158
2ab881f05000-2ab881f28000 rwxp 00000000 00:00 0 
2ab881f28000-2ab881f2e000 rwxp 00000000 00:00 0 
2ab881f2e000-2ab881f8d000 ---p 00000000 00:00 0 
2ab881f8d000-2ab881f90000 rwxp 00000000 00:00 0 
2ab881f90000-2ab882010000 rwxp 00000000 00:00 0 
2ab882010000-2ab882027000 r-xp 00000000 fd:02 29753366                   /export/starexec/sandbox/solver/lib/System.Numerics.dll
2ab882027000-2ab882079000 r-xp 00000000 fd:01 577865                     /usr/lib/mono/gac/Mono.Security/4.0.0.0__0738eb9f132ed756/Mono.Security.dll
2ab882079000-2ab8820e2000 rwxp 00000000 00:00 0 
2ab8820e2000-2ab8820e3000 ---p 00000000 00:00 0 
2ab8820e3000-2ab8820f9000 rwxp 00000000 00:00 0 
2ab8820fc000-2ab8820fe000 rwxp 00000000 00:00 0 
2ab882101000-2ab882102000 rwxp 00000000 00:00 0 
2ab882102000-2ab882103000 r-xp 00021000 fd:01 530934                     /usr/lib64/ld-2.17.so
2ab882103000-2ab882104000 rwxp 00022000 fd:01 530934                     /usr/lib64/ld-2.17.so
2ab882104000-2ab882105000 rwxp 00000000 00:00 0 
2ab882105000-2ab882206000 r-xp 00000000 fd:01 538778                     /usr/lib64/libm-2.17.so
2ab882206000-2ab882405000 ---p 00101000 fd:01 538778                     /usr/lib64/libm-2.17.so
2ab882405000-2ab882406000 r-xp 00100000 fd:01 538778                     /usr/lib64/libm-2.17.so
2ab882406000-2ab882407000 rwxp 00101000 fd:01 538778                     /usr/lib64/libm-2.17.so
2ab882407000-2ab88240e000 r-xp 00000000 fd:01 538805                     /usr/lib64/librt-2.17.so
2ab88240e000-2ab88260d000 ---p 00007000 fd:01 538805                     /usr/lib64/librt-2.17.so
2ab88260d000-2ab88260e000 r-xp 00006000 fd:01 538805                     /usr/lib64/librt-2.17.so
2ab88260e000-2ab88260f000 rwxp 00007000 fd:01 538805                     /usr/lib64/librt-2.17.so
2ab88260f000-2ab882611000 r-xp 00000000 fd:01 538776                     /usr/lib64/libdl-2.17.so
2ab882611000-2ab882811000 ---p 00002000 fd:01 538776                     /usr/lib64/libdl-2.17.so
2ab882811000-2ab882812000 r-xp 00002000 fd:01 538776                     /usr/lib64/libdl-2.17.so
2ab882812000-2ab882813000 rwxp 00003000 fd:01 538776                     /usr/lib64/libdl-2.17.so
2ab882813000-2ab88282a000 r-xp 00000000 fd:01 530971                     /usr/lib64/libpthread-2.17.so
2ab88282a000-2ab882a29000 ---p 00017000 fd:01 530971                     /usr/lib64/libpthread-2.17.so
2ab882a29000-2ab882a2a000 r-xp 00016000 fd:01 530971                     /usr/lib64/libpthread-2.17.so
2ab882a2a000-2ab882a2b000 rwxp 00017000 fd:01 530971                     /usr/lib64/libpthread-2.17.so
2ab882a2b000-2ab882a2f000 rwxp 00000000 00:00 0 
2ab882a2f000-2ab882a44000 r-xp 00000000 fd:01 547887                     /usr/lib64/libgcc_s-4.8.5-20150702.so.1
2ab882a44000-2ab882c43000 ---p 00015000 fd:01 547887                     /usr/lib64/libgcc_s-4.8.5-20150702.so.1
2ab882c43000-2ab882c44000 r-xp 00014000 fd:01 547887                     /usr/lib64/libgcc_s-4.8.5-20150702.so.1
2ab882c44000-2ab882c45000 rwxp 00015000 fd:01 547887                     /usr/lib64/libgcc_s-4.8.5-20150702.so.1
2ab882c45000-2ab882e08000 r-xp 00000000 fd:01 530945                     /usr/lib64/libc-2.17.so
2ab882e08000-2ab883007000 ---p 001c3000 fd:01 530945                     /usr/lib64/libc-2.17.so
2ab883007000-2ab88300b000 r-xp 001c2000 fd:01 530945                     /usr/lib64/libc-2.17.so
2ab88300b000-2ab88300d000 rwxp 001c6000 fd:01 530945                     /usr/lib64/libc-2.17.so
2ab88300d000-2ab883012000 rwxp 00000000 00:00 0 
2ab883012000-2ab88953b000 r-xp 00000000 fd:01 25355                      /usr/lib/locale/locale-archive
2ab88953b000-2ab88953c000 ---p 00000000 00:00 0 
2ab88953c000-2ab8897bc000 rwxp 00000000 00:00 0 
2ab8897be000-2ab8897bf000 rwxp 00000000 00:00 0 
2ab8897c1000-2ab8897e0000 rwxp 00000000 00:00 0 
2ab8897e6000-2ab8897e9000 rwxp 00000000 00:00 0 
2ab889800000-2ab88ac00000 rwxp 00000000 00:00 0 
2ab88ac00000-2ab88afa9000 r-xp 00000000 fd:02 29753367                   /export/starexec/sandbox/solver/lib/mscorlib.dll
2ab88afaa000-2ab88afb2000 ---p 00000000 00:00 0 
2ab88afb2000-2ab88afb3000 ---p 00000000 00:00 0 
2ab88afb3000-2ab88afb4000 rwxp 00000000 00:00 0 
2ab88afb4000-2ab88afbc000 ---p 00000000 00:00 0 
2ab88afbc000-2ab88b1b3000 rwxp 00000000 00:00 0 
2ab88b200000-2ab88b300000 rwxp 00000000 00:00 0 
2ab88b300000-2ab88b58b000 r-xp 00000000 fd:02 29753368                   /export/starexec/sandbox/solver/lib/System.dll
2ab88b58b000-2ab88b674000 r-xp 00000000 fd:01 530959                     /usr/lib64/libstdc++.so.6.0.19
2ab88b674000-2ab88b873000 ---p 000e9000 fd:01 530959                     /usr/lib64/libstdc++.so.6.0.19
2ab88b873000-2ab88b87b000 r-xp 000e8000 fd:01 530959                     /usr/lib64/libstdc++.so.6.0.19
2ab88b87b000-2ab88b87d000 rwxp 000f0000 fd:01 530959                     /usr/lib64/libstdc++.so.6.0.19
2ab88b87d000-2ab88b892000 rwxp 00000000 00:00 0 
2ab88b892000-2ab88b8b7000 r-xp 00000000 fd:01 541236                     /usr/lib64/libgomp.so.1.0.0
2ab88b8b7000-2ab88bab6000 ---p 00025000 fd:01 541236                     /usr/lib64/libgomp.so.1.0.0
2ab88bab6000-2ab88bab7000 r-xp 00024000 fd:01 541236                     /usr/lib64/libgomp.so.1.0.0
2ab88bab7000-2ab88bab8000 rwxp 00025000 fd:01 541236                     /usr/lib64/libgomp.so.1.0.0
2ab88bab8000-2ab88bbaf000 r-xp 00000000 fd:02 29753370                   /export/starexec/sandbox/solver/lib/System.Core.dll
2ab88bbb0000-2ab88bdb0000 rwxp 00000000 00:00 0 
2ab88bdd4000-2ab88bf88000 rwxp 00000000 00:00 0 
2ab88c000000-2ab88c021000 rwxp 00000000 00:00 0 
2ab88c021000-2ab890000000 ---p 00000000 00:00 0 
2ab890000000-2ab890fce000 r-xp 00000000 fd:02 29753371                   /export/starexec/sandbox/solver/lib/libz3.so
2ab890fce000-2ab8911ce000 ---p 00fce000 fd:02 29753371                   /export/starexec/sandbox/solver/lib/libz3.so
2ab8911ce000-2ab8911f6000 r-xp 00fce000 fd:02 29753371                   /export/starexec/sandbox/solver/lib/libz3.so
2ab8911f6000-2ab8911f9000 rwxp 00ff6000 fd:02 29753371                   /export/starexec/sandbox/solver/lib/libz3.so
2ab8911f9000-2ab89147d000 rwxp 00000000 00:00 0 
2ab891480000-2ab891801000 rwxp 00000000 00:00 0 
7fff4a2e1000-7fff4a302000 rwxp 00000000 00:00 0                          [stack]
7fff4a35b000-7fff4a35d000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]

Native stacktrace:


Unhandled Exception:
System.NullReferenceException: Object reference not set to an instance of an object
  at (wrapper managed-to-native) Microsoft.Z3.Native+LIB:Z3_fixedpoint_dec_ref (intptr,intptr)
  at Microsoft.Z3.Native.Z3_fixedpoint_dec_ref (System.IntPtr a0, System.IntPtr a1) [0x00001] in <1589d34e42ba4cbeb3351b894afd3b19>:0 
  at Microsoft.Z3.Fixedpoint+DecRefQueue.DecRef (Microsoft.Z3.Context ctx, System.IntPtr obj) [0x00007] in <1589d34e42ba4cbeb3351b894afd3b19>:0 
  at Microsoft.Z3.IDecRefQueue.Clear (Microsoft.Z3.Context ctx) [0x0002b] in <1589d34e42ba4cbeb3351b894afd3b19>:0 
  at Microsoft.Z3.Context.Dispose () [0x000bd] in <1589d34e42ba4cbeb3351b894afd3b19>:0 
  at Microsoft.Research.T2.MuZ+MuZWrapper.CallSpacer (System.Collections.Generic.Dictionary`2[TKey,TValue] locationToFuncDecl, Microsoft.FSharp.Collections.FSharpList`1[T] rules, Microsoft.Z3.BoolExpr errorQuery) [0x0014d] in <597f493e96b5f0a0a74503833e497f59>:0 
  at Microsoft.Research.T2.MuZ+MuZWrapper.Microsoft-Research-T2-SafetyInterface-SafetyProver-ErrorLocationReachable () [0x000c5] in <597f493e96b5f0a0a74503833e497f59>:0 
  at Microsoft.Research.T2.Termination.prover[a] (Microsoft.Research.T2.Parameters+parameters pars, Microsoft.Research.T2.Programs+Program p_orig, Microsoft.Research.T2.CTL+CTL_Formula f, System.Boolean termination_only, Microsoft.Research.T2.Utils+SetDictionary`2[Key,Value] precondMap, Microsoft.FSharp.Core.FSharpOption`1[T] fairness_constraint, System.Boolean existential, System.Boolean findPreconds, System.Boolean next) [0x0037a] in <597f493e96b5f0a0a74503833e497f59>:0 
  at Microsoft.Research.T2.Termination.bottomUp[a] (Microsoft.Research.T2.Parameters+parameters pars, Microsoft.Research.T2.Programs+Program p, Microsoft.Research.T2.CTL+CTL_Formula f, System.Boolean termination_only, System.Int32 nest_level, Microsoft.FSharp.Core.FSharpOption`1[T] fairness_constraint, Microsoft.Research.T2.Utils+SetDictionary`2[Key,Value] propertyMap) [0x0029e] in <597f493e96b5f0a0a74503833e497f59>:0 
  at Microsoft.Research.T2.Termination.bottomUpProver (Microsoft.Research.T2.Parameters+parameters pars, Microsoft.Research.T2.Programs+Program p, Microsoft.Research.T2.CTL+CTL_Formula f, System.Boolean termination_only, Microsoft.FSharp.Core.FSharpOption`1[T] fairness_constraint) [0x00116] in <597f493e96b5f0a0a74503833e497f59>:0 
  at Microsoft.Research.T2.Main.main$cont@113-1 (Microsoft.Research.T2.Arguments+runMode runMode, Microsoft.Research.T2.Parameters+parameters parameters, System.String fairness_constraint_string, Microsoft.Research.T2.Programs+Program p, Microsoft.FSharp.Core.Unit unitVar) [0x00071] in <597f4945c11a1123a745038345497f59>:0 
  at Microsoft.Research.T2.Main.main (System.String[] arguments) [0x00261] in <597f4945c11a1123a745038345497f59>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object
  at (wrapper managed-to-native) Microsoft.Z3.Native+LIB:Z3_fixedpoint_dec_ref (intptr,intptr)
  at Microsoft.Z3.Native.Z3_fixedpoint_dec_ref (System.IntPtr a0, System.IntPtr a1) [0x00001] in <1589d34e42ba4cbeb3351b894afd3b19>:0 
  at Microsoft.Z3.Fixedpoint+DecRefQueue.DecRef (Microsoft.Z3.Context ctx, System.IntPtr obj) [0x00007] in <1589d34e42ba4cbeb3351b894afd3b19>:0 
  at Microsoft.Z3.IDecRefQueue.Clear (Microsoft.Z3.Context ctx) [0x0002b] in <1589d34e42ba4cbeb3351b894afd3b19>:0 
  at Microsoft.Z3.Context.Dispose () [0x000bd] in <1589d34e42ba4cbeb3351b894afd3b19>:0 
  at Microsoft.Research.T2.MuZ+MuZWrapper.CallSpacer (System.Collections.Generic.Dictionary`2[TKey,TValue] locationToFuncDecl, Microsoft.FSharp.Collections.FSharpList`1[T] rules, Microsoft.Z3.BoolExpr errorQuery) [0x0014d] in <597f493e96b5f0a0a74503833e497f59>:0 
  at Microsoft.Research.T2.MuZ+MuZWrapper.Microsoft-Research-T2-SafetyInterface-SafetyProver-ErrorLocationReachable () [0x000c5] in <597f493e96b5f0a0a74503833e497f59>:0 
  at Microsoft.Research.T2.Termination.prover[a] (Microsoft.Research.T2.Parameters+parameters pars, Microsoft.Research.T2.Programs+Program p_orig, Microsoft.Research.T2.CTL+CTL_Formula f, System.Boolean termination_only, Microsoft.Research.T2.Utils+SetDictionary`2[Key,Value] precondMap, Microsoft.FSharp.Core.FSharpOption`1[T] fairness_constraint, System.Boolean existential, System.Boolean findPreconds, System.Boolean next) [0x0037a] in <597f493e96b5f0a0a74503833e497f59>:0 
  at Microsoft.Research.T2.Termination.bottomUp[a] (Microsoft.Research.T2.Parameters+parameters pars, Microsoft.Research.T2.Programs+Program p, Microsoft.Research.T2.CTL+CTL_Formula f, System.Boolean termination_only, System.Int32 nest_level, Microsoft.FSharp.Core.FSharpOption`1[T] fairness_constraint, Microsoft.Research.T2.Utils+SetDictionary`2[Key,Value] propertyMap) [0x0029e] in <597f493e96b5f0a0a74503833e497f59>:0 
  at Microsoft.Research.T2.Termination.bottomUpProver (Microsoft.Research.T2.Parameters+parameters pars, Microsoft.Research.T2.Programs+Program p, Microsoft.Research.T2.CTL+CTL_Formula f, System.Boolean termination_only, Microsoft.FSharp.Core.FSharpOption`1[T] fairness_constraint) [0x00116] in <597f493e96b5f0a0a74503833e497f59>:0 
  at Microsoft.Research.T2.Main.main$cont@113-1 (Microsoft.Research.T2.Arguments+runMode runMode, Microsoft.Research.T2.Parameters+parameters parameters, System.String fairness_constraint_string, Microsoft.Research.T2.Programs+Program p, Microsoft.FSharp.Core.Unit unitVar) [0x00071] in <597f4945c11a1123a745038345497f59>:0 
  at Microsoft.Research.T2.Main.main (System.String[] arguments) [0x00261] in <597f4945c11a1123a745038345497f59>:0