/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SequenceOfStatements --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf language data_model -i ../../../trunk/examples/svcomp/eca-rers2012/Problem17_label43.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-0f64333 [2020-10-27 00:16:44,909 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-27 00:16:44,916 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-27 00:16:44,961 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-27 00:16:44,962 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-27 00:16:44,964 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-27 00:16:44,965 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-27 00:16:44,968 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-27 00:16:44,970 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-27 00:16:44,972 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-27 00:16:44,973 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-27 00:16:44,975 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-27 00:16:44,975 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-27 00:16:44,977 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-27 00:16:44,978 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-27 00:16:44,980 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-27 00:16:44,981 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-27 00:16:44,983 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-27 00:16:44,985 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-27 00:16:44,988 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-27 00:16:44,990 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-27 00:16:44,992 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-27 00:16:44,994 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-27 00:16:44,995 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-27 00:16:45,008 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-27 00:16:45,009 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-27 00:16:45,009 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-27 00:16:45,010 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-27 00:16:45,010 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-27 00:16:45,011 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-27 00:16:45,012 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-27 00:16:45,013 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-27 00:16:45,014 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-27 00:16:45,015 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-27 00:16:45,016 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-27 00:16:45,017 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-27 00:16:45,017 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-27 00:16:45,018 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-27 00:16:45,018 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-27 00:16:45,020 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-27 00:16:45,021 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-27 00:16:45,022 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-27 00:16:45,050 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-27 00:16:45,051 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-27 00:16:45,054 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-27 00:16:45,055 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-27 00:16:45,055 INFO L138 SettingsManager]: * Use SBE=true [2020-10-27 00:16:45,055 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-27 00:16:45,056 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-27 00:16:45,056 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-27 00:16:45,056 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-27 00:16:45,056 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-27 00:16:45,057 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-27 00:16:45,057 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-27 00:16:45,058 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-27 00:16:45,058 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-27 00:16:45,058 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-27 00:16:45,059 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-27 00:16:45,059 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-27 00:16:45,062 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-27 00:16:45,062 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-27 00:16:45,062 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-27 00:16:45,062 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-27 00:16:45,063 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-27 00:16:45,063 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-27 00:16:45,063 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-27 00:16:45,063 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-27 00:16:45,064 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-27 00:16:45,064 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-27 00:16:45,065 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-27 00:16:45,065 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-27 00:16:45,065 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true;unknown-allowed=true; [2020-10-27 00:16:45,554 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-27 00:16:45,583 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-27 00:16:45,587 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-27 00:16:45,589 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-27 00:16:45,589 INFO L275 PluginConnector]: CDTParser initialized [2020-10-27 00:16:45,592 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem17_label43.c [2020-10-27 00:16:45,685 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ab0b9cd22/281a1eac61e846c4bbb0ef591c218f64/FLAGc9de855bb [2020-10-27 00:16:46,658 INFO L306 CDTParser]: Found 1 translation units. [2020-10-27 00:16:46,664 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/eca-rers2012/Problem17_label43.c [2020-10-27 00:16:46,698 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ab0b9cd22/281a1eac61e846c4bbb0ef591c218f64/FLAGc9de855bb [2020-10-27 00:16:47,192 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ab0b9cd22/281a1eac61e846c4bbb0ef591c218f64 [2020-10-27 00:16:47,199 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-27 00:16:47,209 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-27 00:16:47,213 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-27 00:16:47,213 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-27 00:16:47,218 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-27 00:16:47,220 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 12:16:47" (1/1) ... [2020-10-27 00:16:47,227 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@38959bfe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:16:47, skipping insertion in model container [2020-10-27 00:16:47,227 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 12:16:47" (1/1) ... [2020-10-27 00:16:47,238 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-27 00:16:47,377 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-27 00:16:48,611 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 00:16:48,629 INFO L203 MainTranslator]: Completed pre-run [2020-10-27 00:16:49,092 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 00:16:49,121 INFO L208 MainTranslator]: Completed translation [2020-10-27 00:16:49,121 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:16:49 WrapperNode [2020-10-27 00:16:49,122 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-27 00:16:49,123 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-27 00:16:49,123 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-27 00:16:49,124 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-27 00:16:49,141 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:16:49" (1/1) ... [2020-10-27 00:16:49,144 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:16:49" (1/1) ... [2020-10-27 00:16:49,209 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:16:49" (1/1) ... [2020-10-27 00:16:49,210 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:16:49" (1/1) ... [2020-10-27 00:16:49,321 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:16:49" (1/1) ... [2020-10-27 00:16:49,361 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:16:49" (1/1) ... [2020-10-27 00:16:49,401 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:16:49" (1/1) ... [2020-10-27 00:16:49,442 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-27 00:16:49,445 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-27 00:16:49,445 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-27 00:16:49,445 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-27 00:16:49,447 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:16:49" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-27 00:16:49,538 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-27 00:16:49,539 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-27 00:16:49,539 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-27 00:16:49,539 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2020-10-27 00:16:49,539 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2020-10-27 00:16:49,539 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-27 00:16:49,539 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2020-10-27 00:16:49,540 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2020-10-27 00:16:49,540 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-27 00:16:49,540 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-27 00:16:49,540 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-27 00:16:49,540 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-27 00:16:49,541 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-27 00:16:49,541 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-10-27 00:16:49,541 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-27 00:16:49,541 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-27 00:16:49,541 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-27 00:16:49,541 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-27 00:16:49,542 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-27 00:16:49,542 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-27 00:16:49,542 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-27 00:16:59,138 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-27 00:16:59,139 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-27 00:16:59,142 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 12:16:59 BoogieIcfgContainer [2020-10-27 00:16:59,142 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-27 00:16:59,144 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-27 00:16:59,144 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-27 00:16:59,147 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-27 00:16:59,147 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 12:16:47" (1/3) ... [2020-10-27 00:16:59,149 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19778d1c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 12:16:59, skipping insertion in model container [2020-10-27 00:16:59,149 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:16:49" (2/3) ... [2020-10-27 00:16:59,149 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19778d1c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 12:16:59, skipping insertion in model container [2020-10-27 00:16:59,149 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 12:16:59" (3/3) ... [2020-10-27 00:16:59,152 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem17_label43.c [2020-10-27 00:16:59,166 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-27 00:16:59,172 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-27 00:16:59,187 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-27 00:16:59,222 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-27 00:16:59,222 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-27 00:16:59,222 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-27 00:16:59,222 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-27 00:16:59,222 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-27 00:16:59,223 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-27 00:16:59,223 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-27 00:16:59,223 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-27 00:16:59,256 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states. [2020-10-27 00:16:59,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-10-27 00:16:59,268 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 00:16:59,269 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 00:16:59,269 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 00:16:59,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 00:16:59,281 INFO L82 PathProgramCache]: Analyzing trace with hash 948825059, now seen corresponding path program 1 times [2020-10-27 00:16:59,291 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 00:16:59,292 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [580414488] [2020-10-27 00:16:59,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 00:16:59,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:16:59,658 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:00,261 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:17:00,262 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 79 [2020-10-27 00:17:00,262 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:17:00,263 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 672 [2020-10-27 00:17:00,265 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:17:00,265 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-27 00:17:00,266 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-27 00:17:00,266 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 70 [2020-10-27 00:17:00,266 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-27 00:17:00,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 00:17:00,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:17:00,500 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:00,543 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:17:00,543 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 00:17:00,543 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:17:00,544 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 50 [2020-10-27 00:17:00,545 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:17:00,545 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 00:17:00,545 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:17:00,545 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-27 00:17:00,546 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:17:00,581 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 00:17:00,583 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [580414488] [2020-10-27 00:17:00,585 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 00:17:00,585 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-27 00:17:00,587 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485845948] [2020-10-27 00:17:00,592 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-27 00:17:00,593 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 00:17:00,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-27 00:17:00,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-27 00:17:00,616 INFO L87 Difference]: Start difference. First operand 607 states. Second operand 4 states. [2020-10-27 00:17:13,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 00:17:13,495 INFO L93 Difference]: Finished difference Result 1734 states and 3143 transitions. [2020-10-27 00:17:13,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 00:17:13,498 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 69 [2020-10-27 00:17:13,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 00:17:13,533 INFO L225 Difference]: With dead ends: 1734 [2020-10-27 00:17:13,533 INFO L226 Difference]: Without dead ends: 1048 [2020-10-27 00:17:13,544 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-27 00:17:13,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1048 states. [2020-10-27 00:17:13,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1048 to 1029. [2020-10-27 00:17:13,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1029 states. [2020-10-27 00:17:13,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1029 states to 1029 states and 1764 transitions. [2020-10-27 00:17:13,689 INFO L78 Accepts]: Start accepts. Automaton has 1029 states and 1764 transitions. Word has length 69 [2020-10-27 00:17:13,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 00:17:13,691 INFO L481 AbstractCegarLoop]: Abstraction has 1029 states and 1764 transitions. [2020-10-27 00:17:13,691 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-27 00:17:13,691 INFO L276 IsEmpty]: Start isEmpty. Operand 1029 states and 1764 transitions. [2020-10-27 00:17:13,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2020-10-27 00:17:13,699 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 00:17:13,700 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 00:17:13,700 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-27 00:17:13,700 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 00:17:13,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 00:17:13,701 INFO L82 PathProgramCache]: Analyzing trace with hash 219697502, now seen corresponding path program 1 times [2020-10-27 00:17:13,702 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 00:17:13,702 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1279521213] [2020-10-27 00:17:13,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 00:17:13,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:17:13,807 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:14,353 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:15,616 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:17:15,616 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 150 [2020-10-27 00:17:15,617 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-27 00:17:15,618 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1846 [2020-10-27 00:17:15,620 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:17:15,620 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-27 00:17:15,620 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-27 00:17:15,648 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 75 [2020-10-27 00:17:15,649 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 29 [2020-10-27 00:17:15,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 00:17:15,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:17:15,793 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:15,810 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:17:15,812 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 00:17:15,815 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:17:15,816 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 19 [2020-10-27 00:17:15,816 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:17:15,816 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 00:17:15,816 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:17:15,817 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-27 00:17:15,817 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:17:15,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 00:17:15,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:17:15,896 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:16,078 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:17:16,086 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 70 [2020-10-27 00:17:16,087 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:17:16,087 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 197 [2020-10-27 00:17:16,087 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:17:16,088 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 00:17:16,088 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-27 00:17:16,088 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 70 [2020-10-27 00:17:16,088 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:17:16,258 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 00:17:16,259 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1279521213] [2020-10-27 00:17:16,259 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 00:17:16,260 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-27 00:17:16,260 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866506723] [2020-10-27 00:17:16,262 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-27 00:17:16,263 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 00:17:16,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-27 00:17:16,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-27 00:17:16,268 INFO L87 Difference]: Start difference. First operand 1029 states and 1764 transitions. Second operand 7 states. [2020-10-27 00:17:35,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 00:17:35,458 INFO L93 Difference]: Finished difference Result 3007 states and 5211 transitions. [2020-10-27 00:17:35,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-27 00:17:35,460 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 138 [2020-10-27 00:17:35,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 00:17:35,475 INFO L225 Difference]: With dead ends: 3007 [2020-10-27 00:17:35,476 INFO L226 Difference]: Without dead ends: 1984 [2020-10-27 00:17:35,480 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-10-27 00:17:35,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1984 states. [2020-10-27 00:17:35,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1984 to 1936. [2020-10-27 00:17:35,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1936 states. [2020-10-27 00:17:35,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1936 states to 1936 states and 2920 transitions. [2020-10-27 00:17:35,573 INFO L78 Accepts]: Start accepts. Automaton has 1936 states and 2920 transitions. Word has length 138 [2020-10-27 00:17:35,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 00:17:35,574 INFO L481 AbstractCegarLoop]: Abstraction has 1936 states and 2920 transitions. [2020-10-27 00:17:35,574 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-27 00:17:35,574 INFO L276 IsEmpty]: Start isEmpty. Operand 1936 states and 2920 transitions. [2020-10-27 00:17:35,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2020-10-27 00:17:35,578 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 00:17:35,579 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 00:17:35,579 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-27 00:17:35,579 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 00:17:35,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 00:17:35,580 INFO L82 PathProgramCache]: Analyzing trace with hash 1440148098, now seen corresponding path program 1 times [2020-10-27 00:17:35,580 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 00:17:35,581 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1826030092] [2020-10-27 00:17:35,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 00:17:35,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:17:35,660 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:35,947 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:36,231 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:38,412 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:38,668 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:17:38,669 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 152 [2020-10-27 00:17:38,669 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 4 [2020-10-27 00:17:38,669 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3034 [2020-10-27 00:17:38,669 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:17:38,670 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-10-27 00:17:38,670 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-27 00:17:38,670 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 143 [2020-10-27 00:17:38,670 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:17:38,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 00:17:38,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:17:38,850 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:38,868 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:17:38,868 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 00:17:38,868 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:17:38,868 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 21 [2020-10-27 00:17:38,869 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:17:38,869 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 00:17:38,869 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:17:38,869 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-27 00:17:38,870 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:17:38,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 00:17:38,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:17:38,926 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:38,974 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:39,250 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:17:39,251 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 72 [2020-10-27 00:17:39,251 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-27 00:17:39,251 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 336 [2020-10-27 00:17:39,251 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:17:39,252 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 00:17:39,252 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-27 00:17:39,252 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 72 [2020-10-27 00:17:39,252 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:17:39,332 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-10-27 00:17:39,333 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1826030092] [2020-10-27 00:17:39,333 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 00:17:39,333 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 00:17:39,334 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091165851] [2020-10-27 00:17:39,334 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-27 00:17:39,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 00:17:39,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-27 00:17:39,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-27 00:17:39,335 INFO L87 Difference]: Start difference. First operand 1936 states and 2920 transitions. Second operand 6 states. [2020-10-27 00:17:53,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 00:17:53,377 INFO L93 Difference]: Finished difference Result 4355 states and 6954 transitions. [2020-10-27 00:17:53,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-27 00:17:53,386 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 140 [2020-10-27 00:17:53,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 00:17:53,406 INFO L225 Difference]: With dead ends: 4355 [2020-10-27 00:17:53,407 INFO L226 Difference]: Without dead ends: 2425 [2020-10-27 00:17:53,414 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-27 00:17:53,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2425 states. [2020-10-27 00:17:53,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2425 to 2398. [2020-10-27 00:17:53,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2398 states. [2020-10-27 00:17:53,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2398 states to 2398 states and 3350 transitions. [2020-10-27 00:17:53,532 INFO L78 Accepts]: Start accepts. Automaton has 2398 states and 3350 transitions. Word has length 140 [2020-10-27 00:17:53,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 00:17:53,533 INFO L481 AbstractCegarLoop]: Abstraction has 2398 states and 3350 transitions. [2020-10-27 00:17:53,533 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-27 00:17:53,533 INFO L276 IsEmpty]: Start isEmpty. Operand 2398 states and 3350 transitions. [2020-10-27 00:17:53,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2020-10-27 00:17:53,545 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 00:17:53,545 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 00:17:53,545 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-27 00:17:53,547 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 00:17:53,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 00:17:53,553 INFO L82 PathProgramCache]: Analyzing trace with hash -517086857, now seen corresponding path program 1 times [2020-10-27 00:17:53,554 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 00:17:53,554 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849366996] [2020-10-27 00:17:53,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 00:17:53,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:17:53,646 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:53,793 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:54,479 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:58,613 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:17:58,613 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 155 [2020-10-27 00:17:58,616 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 00:17:58,616 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4999 [2020-10-27 00:17:58,616 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:17:58,616 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 9 [2020-10-27 00:17:58,617 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-27 00:17:58,617 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 113 [2020-10-27 00:17:58,617 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:17:58,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 00:17:58,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:17:58,850 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:58,866 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:17:58,866 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 00:17:58,866 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:17:58,867 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 19 [2020-10-27 00:17:58,867 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:17:58,867 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 00:17:58,867 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:17:58,868 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-27 00:17:58,868 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 00:17:58,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 00:17:58,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:17:58,951 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:17:59,153 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:17:59,153 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 75 [2020-10-27 00:17:59,153 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:17:59,154 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 219 [2020-10-27 00:17:59,154 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:17:59,154 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-27 00:17:59,154 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-27 00:17:59,154 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 75 [2020-10-27 00:17:59,155 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:17:59,542 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 33 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 00:17:59,543 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849366996] [2020-10-27 00:17:59,543 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 00:17:59,545 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-27 00:17:59,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565850079] [2020-10-27 00:17:59,546 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-27 00:17:59,546 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 00:17:59,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-27 00:17:59,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-10-27 00:17:59,558 INFO L87 Difference]: Start difference. First operand 2398 states and 3350 transitions. Second operand 8 states. [2020-10-27 00:18:00,371 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-10-27 00:18:19,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 00:18:19,312 INFO L93 Difference]: Finished difference Result 4436 states and 6348 transitions. [2020-10-27 00:18:19,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-27 00:18:19,314 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 143 [2020-10-27 00:18:19,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 00:18:19,331 INFO L225 Difference]: With dead ends: 4436 [2020-10-27 00:18:19,332 INFO L226 Difference]: Without dead ends: 2438 [2020-10-27 00:18:19,338 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-10-27 00:18:19,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2438 states. [2020-10-27 00:18:19,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2438 to 2403. [2020-10-27 00:18:19,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2403 states. [2020-10-27 00:18:19,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2403 states to 2403 states and 3330 transitions. [2020-10-27 00:18:19,421 INFO L78 Accepts]: Start accepts. Automaton has 2403 states and 3330 transitions. Word has length 143 [2020-10-27 00:18:19,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 00:18:19,422 INFO L481 AbstractCegarLoop]: Abstraction has 2403 states and 3330 transitions. [2020-10-27 00:18:19,422 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-27 00:18:19,422 INFO L276 IsEmpty]: Start isEmpty. Operand 2403 states and 3330 transitions. [2020-10-27 00:18:19,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2020-10-27 00:18:19,425 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 00:18:19,425 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 00:18:19,425 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-27 00:18:19,426 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 00:18:19,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 00:18:19,426 INFO L82 PathProgramCache]: Analyzing trace with hash 2082318114, now seen corresponding path program 1 times [2020-10-27 00:18:19,426 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 00:18:19,427 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [574197071] [2020-10-27 00:18:19,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 00:18:19,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:18:19,504 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:18:19,894 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:18:19,895 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 168 [2020-10-27 00:18:19,895 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:18:19,895 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 420 [2020-10-27 00:18:19,896 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:18:19,896 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 00:18:19,896 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 97 [2020-10-27 00:18:19,896 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 67 [2020-10-27 00:18:19,897 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 00:18:20,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 00:18:20,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:18:20,089 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:18:20,096 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:18:20,097 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 00:18:20,097 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:18:20,097 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 8 [2020-10-27 00:18:20,098 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:18:20,098 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 00:18:20,098 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:18:20,098 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 00:18:20,099 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 00:18:20,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 00:18:20,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:18:20,167 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:18:20,265 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:18:20,266 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 88 [2020-10-27 00:18:20,266 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:18:20,267 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 114 [2020-10-27 00:18:20,267 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:18:20,267 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 00:18:20,268 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:18:20,268 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 82 [2020-10-27 00:18:20,268 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 00:18:20,351 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 60 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 00:18:20,352 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [574197071] [2020-10-27 00:18:20,352 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 00:18:20,353 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 00:18:20,354 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061350094] [2020-10-27 00:18:20,355 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-27 00:18:20,355 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 00:18:20,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-27 00:18:20,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-27 00:18:20,356 INFO L87 Difference]: Start difference. First operand 2403 states and 3330 transitions. Second operand 5 states. [2020-10-27 00:18:38,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 00:18:38,783 INFO L93 Difference]: Finished difference Result 6153 states and 9003 transitions. [2020-10-27 00:18:38,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 00:18:38,785 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 156 [2020-10-27 00:18:38,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 00:18:38,811 INFO L225 Difference]: With dead ends: 6153 [2020-10-27 00:18:38,811 INFO L226 Difference]: Without dead ends: 4189 [2020-10-27 00:18:38,818 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-10-27 00:18:38,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4189 states. [2020-10-27 00:18:38,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4189 to 4174. [2020-10-27 00:18:38,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4174 states. [2020-10-27 00:18:38,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4174 states to 4174 states and 6022 transitions. [2020-10-27 00:18:38,954 INFO L78 Accepts]: Start accepts. Automaton has 4174 states and 6022 transitions. Word has length 156 [2020-10-27 00:18:38,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 00:18:38,954 INFO L481 AbstractCegarLoop]: Abstraction has 4174 states and 6022 transitions. [2020-10-27 00:18:38,954 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-27 00:18:38,955 INFO L276 IsEmpty]: Start isEmpty. Operand 4174 states and 6022 transitions. [2020-10-27 00:18:38,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2020-10-27 00:18:38,960 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 00:18:38,960 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 00:18:38,960 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-27 00:18:38,961 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 00:18:38,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 00:18:38,961 INFO L82 PathProgramCache]: Analyzing trace with hash 1575572067, now seen corresponding path program 1 times [2020-10-27 00:18:38,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 00:18:38,962 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1860753024] [2020-10-27 00:18:38,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 00:18:39,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:18:39,061 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:18:39,186 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:18:39,424 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:18:41,248 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:18:43,902 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:18:43,903 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 241 [2020-10-27 00:18:43,904 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 4 [2020-10-27 00:18:43,904 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4880 [2020-10-27 00:18:43,904 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:18:43,904 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 11 [2020-10-27 00:18:43,905 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-27 00:18:43,905 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 232 [2020-10-27 00:18:43,905 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 00:18:44,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 00:18:44,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:18:44,144 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:18:44,154 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:18:44,154 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 00:18:44,154 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:18:44,154 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 12 [2020-10-27 00:18:44,155 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:18:44,155 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 00:18:44,155 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:18:44,155 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-27 00:18:44,155 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:18:44,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 00:18:44,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:18:44,252 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:18:44,424 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:18:44,425 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 88 [2020-10-27 00:18:44,425 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:18:44,425 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 186 [2020-10-27 00:18:44,425 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:18:44,425 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-27 00:18:44,426 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-27 00:18:44,426 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 88 [2020-10-27 00:18:44,426 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:18:44,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 95 [2020-10-27 00:18:44,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:18:44,553 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:18:44,652 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:18:44,653 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 72 [2020-10-27 00:18:44,653 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:18:44,653 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 111 [2020-10-27 00:18:44,653 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:18:44,654 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 00:18:44,654 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-27 00:18:44,654 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 72 [2020-10-27 00:18:44,654 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:18:44,875 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 124 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-10-27 00:18:44,876 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1860753024] [2020-10-27 00:18:44,877 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 00:18:44,877 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-27 00:18:44,877 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605876677] [2020-10-27 00:18:44,878 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-27 00:18:44,878 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 00:18:44,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-27 00:18:44,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-10-27 00:18:44,879 INFO L87 Difference]: Start difference. First operand 4174 states and 6022 transitions. Second operand 8 states. [2020-10-27 00:18:45,845 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 68 [2020-10-27 00:18:55,280 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 68 [2020-10-27 00:19:06,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 00:19:06,518 INFO L93 Difference]: Finished difference Result 9396 states and 14512 transitions. [2020-10-27 00:19:06,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-27 00:19:06,521 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 227 [2020-10-27 00:19:06,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 00:19:06,553 INFO L225 Difference]: With dead ends: 9396 [2020-10-27 00:19:06,553 INFO L226 Difference]: Without dead ends: 5661 [2020-10-27 00:19:06,567 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-10-27 00:19:06,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5661 states. [2020-10-27 00:19:06,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5661 to 5131. [2020-10-27 00:19:06,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5131 states. [2020-10-27 00:19:06,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5131 states to 5131 states and 7261 transitions. [2020-10-27 00:19:06,752 INFO L78 Accepts]: Start accepts. Automaton has 5131 states and 7261 transitions. Word has length 227 [2020-10-27 00:19:06,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 00:19:06,753 INFO L481 AbstractCegarLoop]: Abstraction has 5131 states and 7261 transitions. [2020-10-27 00:19:06,753 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-27 00:19:06,753 INFO L276 IsEmpty]: Start isEmpty. Operand 5131 states and 7261 transitions. [2020-10-27 00:19:06,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2020-10-27 00:19:06,758 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 00:19:06,758 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 00:19:06,759 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-27 00:19:06,759 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 00:19:06,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 00:19:06,760 INFO L82 PathProgramCache]: Analyzing trace with hash 1126834447, now seen corresponding path program 1 times [2020-10-27 00:19:06,760 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 00:19:06,760 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1696606202] [2020-10-27 00:19:06,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 00:19:06,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:19:06,870 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:06,976 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:08,159 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:08,727 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:19:08,727 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 247 [2020-10-27 00:19:08,727 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 00:19:08,727 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1900 [2020-10-27 00:19:08,728 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:19:08,728 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 00:19:08,728 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 97 [2020-10-27 00:19:08,728 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 80 [2020-10-27 00:19:08,728 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:19:08,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 00:19:08,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:19:08,878 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:08,883 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:19:08,884 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 00:19:08,884 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:19:08,884 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 6 [2020-10-27 00:19:08,884 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:19:08,885 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 00:19:08,885 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:19:08,885 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 00:19:08,885 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:19:08,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 00:19:08,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:19:08,953 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:09,036 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:19:09,036 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 88 [2020-10-27 00:19:09,036 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:19:09,037 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 97 [2020-10-27 00:19:09,037 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:19:09,037 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 00:19:09,037 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:19:09,038 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 82 [2020-10-27 00:19:09,038 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:19:09,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 95 [2020-10-27 00:19:09,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:19:09,113 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:09,281 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:19:09,282 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 78 [2020-10-27 00:19:09,282 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:19:09,282 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 181 [2020-10-27 00:19:09,282 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:19:09,282 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 00:19:09,283 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-27 00:19:09,283 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 78 [2020-10-27 00:19:09,283 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:19:09,400 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 196 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-27 00:19:09,401 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1696606202] [2020-10-27 00:19:09,401 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 00:19:09,401 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-27 00:19:09,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786927245] [2020-10-27 00:19:09,402 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-27 00:19:09,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 00:19:09,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-27 00:19:09,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-27 00:19:09,403 INFO L87 Difference]: Start difference. First operand 5131 states and 7261 transitions. Second operand 7 states. [2020-10-27 00:19:31,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 00:19:31,644 INFO L93 Difference]: Finished difference Result 12699 states and 19260 transitions. [2020-10-27 00:19:31,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-27 00:19:31,647 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 233 [2020-10-27 00:19:31,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 00:19:31,703 INFO L225 Difference]: With dead ends: 12699 [2020-10-27 00:19:31,703 INFO L226 Difference]: Without dead ends: 8009 [2020-10-27 00:19:31,718 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2020-10-27 00:19:31,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8009 states. [2020-10-27 00:19:31,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8009 to 7926. [2020-10-27 00:19:31,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7926 states. [2020-10-27 00:19:31,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7926 states to 7926 states and 10979 transitions. [2020-10-27 00:19:31,985 INFO L78 Accepts]: Start accepts. Automaton has 7926 states and 10979 transitions. Word has length 233 [2020-10-27 00:19:31,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 00:19:31,985 INFO L481 AbstractCegarLoop]: Abstraction has 7926 states and 10979 transitions. [2020-10-27 00:19:31,986 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-27 00:19:31,986 INFO L276 IsEmpty]: Start isEmpty. Operand 7926 states and 10979 transitions. [2020-10-27 00:19:31,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2020-10-27 00:19:31,990 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 00:19:31,991 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 00:19:31,991 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-27 00:19:31,991 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 00:19:31,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 00:19:31,992 INFO L82 PathProgramCache]: Analyzing trace with hash 696074101, now seen corresponding path program 1 times [2020-10-27 00:19:31,992 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 00:19:31,992 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [679377004] [2020-10-27 00:19:31,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 00:19:32,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:19:32,095 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:32,193 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:32,369 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:37,085 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:19:37,085 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 256 [2020-10-27 00:19:37,085 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 00:19:37,086 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5031 [2020-10-27 00:19:37,086 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:19:37,086 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-27 00:19:37,086 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 97 [2020-10-27 00:19:37,086 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 155 [2020-10-27 00:19:37,086 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:19:37,275 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-10-27 00:19:37,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 00:19:37,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:19:37,280 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:37,285 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:19:37,285 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 00:19:37,285 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:19:37,285 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-10-27 00:19:37,286 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:19:37,286 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 00:19:37,286 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:19:37,286 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 00:19:37,286 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:19:37,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 00:19:37,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:19:37,362 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:37,454 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:19:37,454 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 88 [2020-10-27 00:19:37,455 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:19:37,455 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 105 [2020-10-27 00:19:37,455 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:19:37,455 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 00:19:37,456 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:19:37,456 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 82 [2020-10-27 00:19:37,456 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:19:37,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 95 [2020-10-27 00:19:37,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:19:37,531 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:37,640 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:37,776 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:19:37,777 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 87 [2020-10-27 00:19:37,777 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-27 00:19:37,777 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 259 [2020-10-27 00:19:37,777 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:19:37,777 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 00:19:37,777 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-27 00:19:37,778 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 87 [2020-10-27 00:19:37,778 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:19:37,896 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 142 proven. 61 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-10-27 00:19:37,896 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [679377004] [2020-10-27 00:19:37,897 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 00:19:37,897 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-27 00:19:37,897 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319489472] [2020-10-27 00:19:37,898 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-27 00:19:37,898 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 00:19:37,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-27 00:19:37,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-27 00:19:37,899 INFO L87 Difference]: Start difference. First operand 7926 states and 10979 transitions. Second operand 6 states. [2020-10-27 00:19:38,661 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-10-27 00:19:56,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 00:19:56,078 INFO L93 Difference]: Finished difference Result 16805 states and 24258 transitions. [2020-10-27 00:19:56,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-27 00:19:56,081 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 242 [2020-10-27 00:19:56,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 00:19:56,129 INFO L225 Difference]: With dead ends: 16805 [2020-10-27 00:19:56,129 INFO L226 Difference]: Without dead ends: 9327 [2020-10-27 00:19:56,152 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-27 00:19:56,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9327 states. [2020-10-27 00:19:56,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9327 to 9258. [2020-10-27 00:19:56,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9258 states. [2020-10-27 00:19:56,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9258 states to 9258 states and 12895 transitions. [2020-10-27 00:19:56,494 INFO L78 Accepts]: Start accepts. Automaton has 9258 states and 12895 transitions. Word has length 242 [2020-10-27 00:19:56,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 00:19:56,495 INFO L481 AbstractCegarLoop]: Abstraction has 9258 states and 12895 transitions. [2020-10-27 00:19:56,496 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-27 00:19:56,496 INFO L276 IsEmpty]: Start isEmpty. Operand 9258 states and 12895 transitions. [2020-10-27 00:19:56,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 314 [2020-10-27 00:19:56,505 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 00:19:56,506 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 00:19:56,506 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-10-27 00:19:56,506 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 00:19:56,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 00:19:56,507 INFO L82 PathProgramCache]: Analyzing trace with hash 1104808950, now seen corresponding path program 1 times [2020-10-27 00:19:56,507 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 00:19:56,513 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924130777] [2020-10-27 00:19:56,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 00:19:56,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:19:56,663 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:56,847 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:56,958 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:59,520 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:19:59,724 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:20:01,619 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:20:01,620 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 329 [2020-10-27 00:20:01,620 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-27 00:20:01,620 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5017 [2020-10-27 00:20:01,620 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:20:01,620 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 00:20:01,621 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 97 [2020-10-27 00:20:01,621 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 74 [2020-10-27 00:20:01,621 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:20:01,807 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-10-27 00:20:01,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 00:20:01,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:20:01,814 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:20:01,818 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:20:01,819 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 00:20:01,819 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:20:01,819 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 6 [2020-10-27 00:20:01,819 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:20:01,820 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 00:20:01,820 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:20:01,820 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 00:20:01,820 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:20:01,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 00:20:01,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:20:01,894 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:20:01,980 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:20:01,980 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 88 [2020-10-27 00:20:01,980 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:20:01,980 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 101 [2020-10-27 00:20:01,981 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:20:01,981 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 00:20:01,981 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 00:20:01,981 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 82 [2020-10-27 00:20:01,981 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:20:02,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 95 [2020-10-27 00:20:02,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:20:02,051 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:20:02,165 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:20:02,165 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 72 [2020-10-27 00:20:02,165 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:20:02,166 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 127 [2020-10-27 00:20:02,166 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:20:02,166 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 00:20:02,166 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-27 00:20:02,166 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 72 [2020-10-27 00:20:02,166 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:20:02,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 166 [2020-10-27 00:20:02,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 00:20:02,278 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 00:20:02,324 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 00:20:02,324 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 87 [2020-10-27 00:20:02,324 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 00:20:02,325 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 61 [2020-10-27 00:20:02,325 FATAL L256 erpolLogProxyWrapper]: Heuristic: SHALLOWEST [2020-10-27 00:20:02,325 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 00:20:02,325 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 84 [2020-10-27 00:20:02,325 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 00:20:02,326 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 00:20:02,518 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 255 proven. 70 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2020-10-27 00:20:02,519 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924130777] [2020-10-27 00:20:02,519 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 00:20:02,520 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-27 00:20:02,521 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953893194] [2020-10-27 00:20:02,522 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-27 00:20:02,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 00:20:02,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-27 00:20:02,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-27 00:20:02,523 INFO L87 Difference]: Start difference. First operand 9258 states and 12895 transitions. Second operand 7 states. [2020-10-27 00:20:11,128 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 68