/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.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 --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.4 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 23:57:26,053 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 23:57:26,056 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 23:57:26,095 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 23:57:26,097 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 23:57:26,106 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 23:57:26,108 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 23:57:26,111 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 23:57:26,115 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 23:57:26,118 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 23:57:26,119 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 23:57:26,120 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 23:57:26,120 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 23:57:26,123 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 23:57:26,125 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 23:57:26,128 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 23:57:26,130 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 23:57:26,131 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 23:57:26,132 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 23:57:26,140 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 23:57:26,142 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 23:57:26,143 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 23:57:26,144 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 23:57:26,145 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 23:57:26,157 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 23:57:26,157 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 23:57:26,157 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 23:57:26,164 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 23:57:26,165 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 23:57:26,166 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 23:57:26,166 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 23:57:26,166 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 23:57:26,169 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 23:57:26,170 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 23:57:26,174 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 23:57:26,174 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 23:57:26,175 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 23:57:26,175 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 23:57:26,175 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 23:57:26,176 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 23:57:26,178 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 23:57:26,178 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 [2020-08-21 23:57:26,218 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 23:57:26,218 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 23:57:26,220 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 23:57:26,220 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 23:57:26,220 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 23:57:26,220 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 23:57:26,221 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 23:57:26,221 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 23:57:26,221 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 23:57:26,221 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 23:57:26,222 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 23:57:26,222 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 23:57:26,223 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 23:57:26,223 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 23:57:26,223 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 23:57:26,224 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 23:57:26,224 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 23:57:26,224 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 23:57:26,224 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 23:57:26,224 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 23:57:26,225 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 23:57:26,225 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 23:57:26,225 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 23:57:26,225 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 23:57:26,226 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 23:57:26,226 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 23:57:26,226 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 23:57:26,226 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 23:57:26,226 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 23:57:26,227 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; [2020-08-21 23:57:26,565 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 23:57:26,584 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 23:57:26,588 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 23:57:26,590 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 23:57:26,590 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 23:57:26,591 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-08-21 23:57:26,652 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b62335aff/c9628360268845358003e83b33725d68/FLAGac37a090b [2020-08-21 23:57:27,375 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 23:57:27,375 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-08-21 23:57:27,398 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b62335aff/c9628360268845358003e83b33725d68/FLAGac37a090b [2020-08-21 23:57:27,471 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b62335aff/c9628360268845358003e83b33725d68 [2020-08-21 23:57:27,484 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 23:57:27,486 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 23:57:27,488 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 23:57:27,488 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 23:57:27,492 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 23:57:27,493 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:57:27" (1/1) ... [2020-08-21 23:57:27,496 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2bd22e29 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:57:27, skipping insertion in model container [2020-08-21 23:57:27,497 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:57:27" (1/1) ... [2020-08-21 23:57:27,505 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 23:57:27,661 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 23:57:29,031 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:57:29,045 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 23:57:30,427 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:57:30,463 INFO L208 MainTranslator]: Completed translation [2020-08-21 23:57:30,465 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:57:30 WrapperNode [2020-08-21 23:57:30,465 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 23:57:30,466 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 23:57:30,466 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 23:57:30,466 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 23:57:30,481 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:57:30" (1/1) ... [2020-08-21 23:57:30,483 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:57:30" (1/1) ... [2020-08-21 23:57:30,542 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:57:30" (1/1) ... [2020-08-21 23:57:30,543 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:57:30" (1/1) ... [2020-08-21 23:57:30,595 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:57:30" (1/1) ... [2020-08-21 23:57:30,627 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:57:30" (1/1) ... [2020-08-21 23:57:30,641 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:57:30" (1/1) ... [2020-08-21 23:57:30,658 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 23:57:30,659 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 23:57:30,659 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 23:57:30,659 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 23:57:30,661 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:57:30" (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 [2020-08-21 23:57:30,731 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 23:57:30,732 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 23:57:30,732 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 23:57:30,733 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 23:57:30,733 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 23:57:30,733 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 23:57:30,733 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-21 23:57:30,734 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-21 23:57:30,734 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 23:57:30,735 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 23:57:30,735 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-21 23:57:30,735 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-21 23:57:30,735 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-21 23:57:30,735 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-21 23:57:30,736 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-21 23:57:30,736 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-21 23:57:30,737 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-21 23:57:30,737 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 23:57:30,737 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 23:57:30,737 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 23:57:30,738 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 23:57:30,738 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 23:57:34,773 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 23:57:34,773 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 23:57:34,787 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:57:34 BoogieIcfgContainer [2020-08-21 23:57:34,787 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 23:57:34,789 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 23:57:34,789 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 23:57:34,792 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 23:57:34,792 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 11:57:27" (1/3) ... [2020-08-21 23:57:34,793 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76232066 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:57:34, skipping insertion in model container [2020-08-21 23:57:34,793 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:57:30" (2/3) ... [2020-08-21 23:57:34,794 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76232066 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:57:34, skipping insertion in model container [2020-08-21 23:57:34,794 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:57:34" (3/3) ... [2020-08-21 23:57:34,796 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-08-21 23:57:34,809 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 23:57:34,819 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 23:57:34,836 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 23:57:34,869 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 23:57:34,870 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 23:57:34,870 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 23:57:34,870 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 23:57:34,870 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 23:57:34,870 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 23:57:34,870 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 23:57:34,871 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 23:57:34,913 INFO L276 IsEmpty]: Start isEmpty. Operand 1322 states. [2020-08-21 23:57:34,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-08-21 23:57:34,949 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:57:34,951 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, 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, 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, 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, 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, 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, 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] [2020-08-21 23:57:34,952 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:57:34,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:57:34,960 INFO L82 PathProgramCache]: Analyzing trace with hash -191467784, now seen corresponding path program 1 times [2020-08-21 23:57:34,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:57:34,970 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1906766109] [2020-08-21 23:57:34,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:57:36,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:57:37,793 WARN L193 SmtUtils]: Spent 1.02 s on a formula simplification that was a NOOP. DAG size: 388 [2020-08-21 23:57:37,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:57:37,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:57:38,085 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:57:38,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1906766109] [2020-08-21 23:57:38,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:57:38,088 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 23:57:38,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521673479] [2020-08-21 23:57:38,094 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 23:57:38,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:57:38,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 23:57:38,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 23:57:38,108 INFO L87 Difference]: Start difference. First operand 1322 states. Second operand 4 states. [2020-08-21 23:57:39,154 WARN L193 SmtUtils]: Spent 957.00 ms on a formula simplification that was a NOOP. DAG size: 389 [2020-08-21 23:57:49,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:57:49,093 INFO L93 Difference]: Finished difference Result 2212 states and 3947 transitions. [2020-08-21 23:57:49,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 23:57:49,095 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 467 [2020-08-21 23:57:49,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:57:49,136 INFO L225 Difference]: With dead ends: 2212 [2020-08-21 23:57:49,136 INFO L226 Difference]: Without dead ends: 1956 [2020-08-21 23:57:49,143 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:57:49,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1956 states. [2020-08-21 23:57:49,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1956 to 1954. [2020-08-21 23:57:49,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1954 states. [2020-08-21 23:57:49,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1954 states to 1954 states and 3183 transitions. [2020-08-21 23:57:49,291 INFO L78 Accepts]: Start accepts. Automaton has 1954 states and 3183 transitions. Word has length 467 [2020-08-21 23:57:49,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:57:49,293 INFO L479 AbstractCegarLoop]: Abstraction has 1954 states and 3183 transitions. [2020-08-21 23:57:49,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 23:57:49,293 INFO L276 IsEmpty]: Start isEmpty. Operand 1954 states and 3183 transitions. [2020-08-21 23:57:49,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-08-21 23:57:49,303 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:57:49,304 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, 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, 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, 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, 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, 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, 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] [2020-08-21 23:57:49,304 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 23:57:49,305 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:57:49,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:57:49,305 INFO L82 PathProgramCache]: Analyzing trace with hash -1227921449, now seen corresponding path program 1 times [2020-08-21 23:57:49,306 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:57:49,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1396230122] [2020-08-21 23:57:49,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:57:50,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:57:52,359 WARN L193 SmtUtils]: Spent 1.49 s on a formula simplification that was a NOOP. DAG size: 388 [2020-08-21 23:57:52,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:57:52,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:57:52,796 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:57:52,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1396230122] [2020-08-21 23:57:52,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:57:52,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 23:57:52,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637689540] [2020-08-21 23:57:52,801 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 23:57:52,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:57:52,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 23:57:52,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:57:52,802 INFO L87 Difference]: Start difference. First operand 1954 states and 3183 transitions. Second operand 5 states. [2020-08-21 23:58:08,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:58:08,992 INFO L93 Difference]: Finished difference Result 5793 states and 9438 transitions. [2020-08-21 23:58:08,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 23:58:08,996 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 467 [2020-08-21 23:58:08,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:58:09,021 INFO L225 Difference]: With dead ends: 5793 [2020-08-21 23:58:09,021 INFO L226 Difference]: Without dead ends: 3856 [2020-08-21 23:58:09,031 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:58:09,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3856 states. [2020-08-21 23:58:09,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3856 to 3854. [2020-08-21 23:58:09,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3854 states. [2020-08-21 23:58:09,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3854 states to 3854 states and 6254 transitions. [2020-08-21 23:58:09,260 INFO L78 Accepts]: Start accepts. Automaton has 3854 states and 6254 transitions. Word has length 467 [2020-08-21 23:58:09,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:58:09,261 INFO L479 AbstractCegarLoop]: Abstraction has 3854 states and 6254 transitions. [2020-08-21 23:58:09,261 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 23:58:09,262 INFO L276 IsEmpty]: Start isEmpty. Operand 3854 states and 6254 transitions. [2020-08-21 23:58:09,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-08-21 23:58:09,288 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:58:09,289 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, 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, 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, 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, 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, 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, 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] [2020-08-21 23:58:09,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 23:58:09,289 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:58:09,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:58:09,290 INFO L82 PathProgramCache]: Analyzing trace with hash 1934187579, now seen corresponding path program 1 times [2020-08-21 23:58:09,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:58:09,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1036659629] [2020-08-21 23:58:09,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:58:09,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:58:10,924 WARN L193 SmtUtils]: Spent 1.12 s on a formula simplification that was a NOOP. DAG size: 388 [2020-08-21 23:58:10,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:58:10,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:58:11,348 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:58:11,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1036659629] [2020-08-21 23:58:11,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:58:11,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 23:58:11,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959718832] [2020-08-21 23:58:11,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 23:58:11,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:58:11,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 23:58:11,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 23:58:11,353 INFO L87 Difference]: Start difference. First operand 3854 states and 6254 transitions. Second operand 4 states.