/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 --rcfgbuilder.size.of.a.code.block SingleStatement --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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.5 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-c90d42b [2020-09-25 14:46:38,912 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-25 14:46:38,917 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-25 14:46:38,961 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-25 14:46:38,961 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-25 14:46:38,963 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-25 14:46:38,964 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-25 14:46:38,966 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-25 14:46:38,968 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-25 14:46:38,970 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-25 14:46:38,971 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-25 14:46:38,972 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-25 14:46:38,973 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-25 14:46:38,974 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-25 14:46:38,975 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-25 14:46:38,977 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-25 14:46:38,978 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-25 14:46:38,979 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-25 14:46:38,981 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-25 14:46:38,983 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-25 14:46:38,984 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-25 14:46:38,986 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-25 14:46:38,987 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-25 14:46:38,988 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-25 14:46:38,991 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-25 14:46:38,991 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-25 14:46:38,992 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-25 14:46:38,993 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-25 14:46:38,993 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-25 14:46:38,995 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-25 14:46:38,995 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-25 14:46:38,996 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-25 14:46:38,997 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-25 14:46:38,998 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-25 14:46:38,999 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-25 14:46:39,000 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-25 14:46:39,001 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-25 14:46:39,001 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-25 14:46:39,001 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-25 14:46:39,002 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-25 14:46:39,003 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-25 14:46:39,004 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 [2020-09-25 14:46:39,030 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-25 14:46:39,031 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-25 14:46:39,032 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-25 14:46:39,032 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-25 14:46:39,033 INFO L138 SettingsManager]: * Use SBE=true [2020-09-25 14:46:39,033 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-25 14:46:39,033 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-25 14:46:39,033 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-25 14:46:39,034 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-25 14:46:39,034 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-25 14:46:39,034 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-25 14:46:39,034 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-25 14:46:39,034 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-25 14:46:39,035 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-25 14:46:39,035 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-25 14:46:39,035 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-25 14:46:39,035 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-25 14:46:39,036 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-25 14:46:39,036 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-25 14:46:39,036 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-25 14:46:39,036 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-25 14:46:39,036 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-25 14:46:39,037 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-25 14:46:39,037 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-25 14:46:39,037 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-25 14:46:39,037 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-25 14:46:39,038 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-25 14:46:39,038 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-25 14:46:39,038 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-25 14:46:39,038 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.rcfgbuilder: Size of a code block -> SingleStatement 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=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=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=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=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=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=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=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=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=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=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=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; [2020-09-25 14:46:39,522 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-25 14:46:39,547 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-25 14:46:39,552 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-25 14:46:39,554 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-25 14:46:39,555 INFO L275 PluginConnector]: CDTParser initialized [2020-09-25 14:46:39,556 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-09-25 14:46:39,646 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e3d9322b7/4f00e7e7582f497ba0118c7027551852/FLAG0a2879064 [2020-09-25 14:46:40,253 INFO L306 CDTParser]: Found 1 translation units. [2020-09-25 14:46:40,254 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-09-25 14:46:40,263 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e3d9322b7/4f00e7e7582f497ba0118c7027551852/FLAG0a2879064 [2020-09-25 14:46:40,551 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e3d9322b7/4f00e7e7582f497ba0118c7027551852 [2020-09-25 14:46:40,566 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-25 14:46:40,572 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-25 14:46:40,574 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-25 14:46:40,574 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-25 14:46:40,578 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-25 14:46:40,579 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 02:46:40" (1/1) ... [2020-09-25 14:46:40,584 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e8d9ea1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:46:40, skipping insertion in model container [2020-09-25 14:46:40,584 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 02:46:40" (1/1) ... [2020-09-25 14:46:40,593 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-25 14:46:40,620 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-25 14:46:40,838 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 14:46:40,844 INFO L203 MainTranslator]: Completed pre-run [2020-09-25 14:46:40,874 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 14:46:40,900 INFO L208 MainTranslator]: Completed translation [2020-09-25 14:46:40,900 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:46:40 WrapperNode [2020-09-25 14:46:40,900 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-25 14:46:40,901 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-25 14:46:40,902 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-25 14:46:40,902 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-25 14:46:40,997 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:46:40" (1/1) ... [2020-09-25 14:46:40,997 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:46:40" (1/1) ... [2020-09-25 14:46:41,007 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:46:40" (1/1) ... [2020-09-25 14:46:41,007 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:46:40" (1/1) ... [2020-09-25 14:46:41,015 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:46:40" (1/1) ... [2020-09-25 14:46:41,022 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:46:40" (1/1) ... [2020-09-25 14:46:41,023 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:46:40" (1/1) ... [2020-09-25 14:46:41,026 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-25 14:46:41,026 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-25 14:46:41,027 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-25 14:46:41,027 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-25 14:46:41,028 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:46:40" (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 [2020-09-25 14:46:41,114 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-25 14:46:41,115 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-25 14:46:41,115 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-25 14:46:41,115 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-25 14:46:41,115 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-25 14:46:41,116 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-25 14:46:41,116 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-25 14:46:41,117 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-09-25 14:46:41,117 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-09-25 14:46:41,117 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-25 14:46:41,118 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-25 14:46:41,118 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-25 14:46:41,118 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-25 14:46:41,118 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-25 14:46:41,118 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-25 14:46:41,119 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-25 14:46:41,498 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-25 14:46:41,499 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-09-25 14:46:41,504 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 02:46:41 BoogieIcfgContainer [2020-09-25 14:46:41,505 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-25 14:46:41,506 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-25 14:46:41,507 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-25 14:46:41,510 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-25 14:46:41,510 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.09 02:46:40" (1/3) ... [2020-09-25 14:46:41,511 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4483c449 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 02:46:41, skipping insertion in model container [2020-09-25 14:46:41,512 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 02:46:40" (2/3) ... [2020-09-25 14:46:41,512 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4483c449 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 02:46:41, skipping insertion in model container [2020-09-25 14:46:41,512 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 02:46:41" (3/3) ... [2020-09-25 14:46:41,514 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-09-25 14:46:41,525 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-25 14:46:41,535 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-25 14:46:41,558 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-25 14:46:41,589 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-25 14:46:41,590 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-25 14:46:41,590 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-25 14:46:41,590 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-25 14:46:41,590 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-25 14:46:41,590 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-25 14:46:41,590 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-25 14:46:41,590 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-25 14:46:41,616 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states. [2020-09-25 14:46:41,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-25 14:46:41,624 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 14:46:41,625 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] [2020-09-25 14:46:41,625 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 14:46:41,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 14:46:41,632 INFO L82 PathProgramCache]: Analyzing trace with hash -1584943199, now seen corresponding path program 1 times [2020-09-25 14:46:41,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 14:46:41,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [596153098] [2020-09-25 14:46:41,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 14:46:41,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:46:41,816 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:41,881 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:42,073 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:42,483 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:46:42,483 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-09-25 14:46:42,484 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-09-25 14:46:42,484 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 697 [2020-09-25 14:46:42,487 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:46:42,488 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:46:42,488 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-25 14:46:42,488 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 16 [2020-09-25 14:46:42,489 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 13 [2020-09-25 14:46:42,489 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 4 [2020-09-25 14:46:42,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 14:46:42,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:46:42,608 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:42,618 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:46:42,619 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 14:46:42,619 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:46:42,619 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 12 [2020-09-25 14:46:42,620 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:46:42,621 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:46:42,621 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 14:46:42,621 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 14:46:42,621 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 14:46:42,622 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:46:42,644 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 14:46:42,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [596153098] [2020-09-25 14:46:42,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 14:46:42,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-25 14:46:42,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699199956] [2020-09-25 14:46:42,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-25 14:46:42,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 14:46:42,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-25 14:46:42,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-25 14:46:42,680 INFO L87 Difference]: Start difference. First operand 66 states. Second operand 5 states. [2020-09-25 14:46:43,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 14:46:43,038 INFO L93 Difference]: Finished difference Result 139 states and 161 transitions. [2020-09-25 14:46:43,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-25 14:46:43,040 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2020-09-25 14:46:43,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 14:46:43,054 INFO L225 Difference]: With dead ends: 139 [2020-09-25 14:46:43,054 INFO L226 Difference]: Without dead ends: 75 [2020-09-25 14:46:43,059 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-09-25 14:46:43,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-09-25 14:46:43,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 58. [2020-09-25 14:46:43,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-09-25 14:46:43,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-09-25 14:46:43,122 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 31 [2020-09-25 14:46:43,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 14:46:43,123 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-09-25 14:46:43,123 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-25 14:46:43,123 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-09-25 14:46:43,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-25 14:46:43,125 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 14:46:43,125 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] [2020-09-25 14:46:43,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-25 14:46:43,126 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 14:46:43,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 14:46:43,127 INFO L82 PathProgramCache]: Analyzing trace with hash 419131922, now seen corresponding path program 1 times [2020-09-25 14:46:43,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 14:46:43,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1064992056] [2020-09-25 14:46:43,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 14:46:43,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:46:43,156 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:43,204 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:43,279 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:43,553 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:43,974 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:44,336 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:45,059 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:46:45,060 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 50 [2020-09-25 14:46:45,060 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 6 [2020-09-25 14:46:45,060 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1914 [2020-09-25 14:46:45,060 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:46:45,061 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:46:45,064 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-25 14:46:45,065 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 23 [2020-09-25 14:46:45,065 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 19 [2020-09-25 14:46:45,065 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 4 [2020-09-25 14:46:45,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 14:46:45,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:46:45,126 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:45,132 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:46:45,133 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 14:46:45,133 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:46:45,133 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 7 [2020-09-25 14:46:45,134 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:46:45,135 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:46:45,135 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 14:46:45,135 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 14:46:45,135 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 14:46:45,142 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 7 [2020-09-25 14:46:45,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-25 14:46:45,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1064992056] [2020-09-25 14:46:45,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 14:46:45,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-09-25 14:46:45,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650013063] [2020-09-25 14:46:45,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-25 14:46:45,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 14:46:45,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-25 14:46:45,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-09-25 14:46:45,157 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 6 states. [2020-09-25 14:46:45,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 14:46:45,395 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-09-25 14:46:45,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-25 14:46:45,396 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-09-25 14:46:45,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 14:46:45,398 INFO L225 Difference]: With dead ends: 118 [2020-09-25 14:46:45,398 INFO L226 Difference]: Without dead ends: 75 [2020-09-25 14:46:45,400 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-09-25 14:46:45,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-09-25 14:46:45,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 59. [2020-09-25 14:46:45,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-09-25 14:46:45,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2020-09-25 14:46:45,410 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 41 [2020-09-25 14:46:45,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 14:46:45,411 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2020-09-25 14:46:45,411 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-25 14:46:45,411 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2020-09-25 14:46:45,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-09-25 14:46:45,412 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 14:46:45,413 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] [2020-09-25 14:46:45,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-25 14:46:45,413 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 14:46:45,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 14:46:45,414 INFO L82 PathProgramCache]: Analyzing trace with hash -2141827952, now seen corresponding path program 1 times [2020-09-25 14:46:45,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 14:46:45,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1326345582] [2020-09-25 14:46:45,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 14:46:45,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:46:45,453 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:45,688 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:45,849 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:46,756 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:47,866 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:48,332 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:48,445 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:49,053 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:50,436 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:46:50,437 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 57 [2020-09-25 14:46:50,437 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 8 [2020-09-25 14:46:50,437 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5000 [2020-09-25 14:46:50,438 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:46:50,438 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:46:50,439 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 15 [2020-09-25 14:46:50,439 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 16 [2020-09-25 14:46:50,439 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 40 [2020-09-25 14:46:50,440 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-09-25 14:46:50,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 14:46:50,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:46:50,864 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:50,869 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:46:50,869 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 14:46:50,869 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:46:50,870 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 6 [2020-09-25 14:46:50,870 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:46:50,870 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:46:50,870 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 14:46:50,871 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 14:46:50,871 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 14:46:50,871 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:46:50,884 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 14:46:50,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1326345582] [2020-09-25 14:46:50,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-25 14:46:50,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-09-25 14:46:50,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478548112] [2020-09-25 14:46:50,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-25 14:46:50,887 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 14:46:50,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-25 14:46:50,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=234, Unknown=0, NotChecked=0, Total=272 [2020-09-25 14:46:50,888 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 17 states. [2020-09-25 14:46:52,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 14:46:52,055 INFO L93 Difference]: Finished difference Result 164 states and 173 transitions. [2020-09-25 14:46:52,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-09-25 14:46:52,055 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-09-25 14:46:52,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 14:46:52,058 INFO L225 Difference]: With dead ends: 164 [2020-09-25 14:46:52,058 INFO L226 Difference]: Without dead ends: 162 [2020-09-25 14:46:52,059 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=248, Invalid=1084, Unknown=0, NotChecked=0, Total=1332 [2020-09-25 14:46:52,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-09-25 14:46:52,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 90. [2020-09-25 14:46:52,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-09-25 14:46:52,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2020-09-25 14:46:52,092 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 48 [2020-09-25 14:46:52,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 14:46:52,092 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2020-09-25 14:46:52,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-25 14:46:52,093 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2020-09-25 14:46:52,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-09-25 14:46:52,099 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 14:46:52,103 INFO L422 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1] [2020-09-25 14:46:52,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-25 14:46:52,104 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 14:46:52,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 14:46:52,104 INFO L82 PathProgramCache]: Analyzing trace with hash -523876270, now seen corresponding path program 2 times [2020-09-25 14:46:52,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 14:46:52,105 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [880487573] [2020-09-25 14:46:52,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 14:46:52,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:46:52,145 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:52,302 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:52,489 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:53,632 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:54,136 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:57,136 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:46:57,136 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 64 [2020-09-25 14:46:57,136 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-09-25 14:46:57,137 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5005 [2020-09-25 14:46:57,137 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:46:57,137 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:46:57,137 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-09-25 14:46:57,138 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 23 [2020-09-25 14:46:57,138 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 30 [2020-09-25 14:46:57,138 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:46:57,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 14:46:57,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:46:57,236 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:57,240 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:46:57,241 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 14:46:57,244 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:46:57,245 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 6 [2020-09-25 14:46:57,245 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:46:57,246 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:46:57,246 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 14:46:57,246 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 14:46:57,246 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 14:46:57,247 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:46:57,254 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 14:46:57,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [880487573] [2020-09-25 14:46:57,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-25 14:46:57,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-25 14:46:57,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139545066] [2020-09-25 14:46:57,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-25 14:46:57,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 14:46:57,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-25 14:46:57,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-25 14:46:57,259 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand 8 states. [2020-09-25 14:46:57,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 14:46:57,631 INFO L93 Difference]: Finished difference Result 166 states and 175 transitions. [2020-09-25 14:46:57,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-25 14:46:57,631 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 55 [2020-09-25 14:46:57,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 14:46:57,638 INFO L225 Difference]: With dead ends: 166 [2020-09-25 14:46:57,638 INFO L226 Difference]: Without dead ends: 146 [2020-09-25 14:46:57,639 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-09-25 14:46:57,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-09-25 14:46:57,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 100. [2020-09-25 14:46:57,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-09-25 14:46:57,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2020-09-25 14:46:57,665 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 55 [2020-09-25 14:46:57,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 14:46:57,666 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2020-09-25 14:46:57,666 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-25 14:46:57,666 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2020-09-25 14:46:57,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-09-25 14:46:57,668 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 14:46:57,668 INFO L422 BasicCegarLoop]: trace histogram [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, 1, 1] [2020-09-25 14:46:57,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-25 14:46:57,669 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 14:46:57,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 14:46:57,670 INFO L82 PathProgramCache]: Analyzing trace with hash -2134174762, now seen corresponding path program 3 times [2020-09-25 14:46:57,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 14:46:57,670 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1417366483] [2020-09-25 14:46:57,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 14:46:57,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:46:57,704 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:57,871 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:58,111 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:58,393 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:58,510 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:59,570 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:46:59,819 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:00,836 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:01,038 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:02,696 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:47:02,697 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 67 [2020-09-25 14:47:02,697 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 9 [2020-09-25 14:47:02,697 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5007 [2020-09-25 14:47:02,698 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:47:02,698 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:47:02,699 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 17 [2020-09-25 14:47:02,699 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 23 [2020-09-25 14:47:02,699 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 43 [2020-09-25 14:47:02,699 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:47:03,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 14:47:03,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:47:03,041 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:03,046 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:47:03,047 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 14:47:03,047 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:47:03,047 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 6 [2020-09-25 14:47:03,048 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:47:03,048 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:47:03,048 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 14:47:03,048 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 14:47:03,048 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 14:47:03,049 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:47:03,062 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-09-25 14:47:03,064 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1417366483] [2020-09-25 14:47:03,064 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-25 14:47:03,064 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-09-25 14:47:03,065 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962826452] [2020-09-25 14:47:03,065 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-09-25 14:47:03,065 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 14:47:03,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-09-25 14:47:03,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=268, Unknown=0, NotChecked=0, Total=306 [2020-09-25 14:47:03,066 INFO L87 Difference]: Start difference. First operand 100 states and 104 transitions. Second operand 18 states. [2020-09-25 14:47:04,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 14:47:04,242 INFO L93 Difference]: Finished difference Result 157 states and 164 transitions. [2020-09-25 14:47:04,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-09-25 14:47:04,242 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 58 [2020-09-25 14:47:04,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 14:47:04,244 INFO L225 Difference]: With dead ends: 157 [2020-09-25 14:47:04,244 INFO L226 Difference]: Without dead ends: 155 [2020-09-25 14:47:04,246 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=271, Invalid=1369, Unknown=0, NotChecked=0, Total=1640 [2020-09-25 14:47:04,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-09-25 14:47:04,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 100. [2020-09-25 14:47:04,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-09-25 14:47:04,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2020-09-25 14:47:04,274 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 58 [2020-09-25 14:47:04,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 14:47:04,278 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2020-09-25 14:47:04,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-09-25 14:47:04,278 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2020-09-25 14:47:04,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-09-25 14:47:04,284 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 14:47:04,284 INFO L422 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 14:47:04,284 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-25 14:47:04,285 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 14:47:04,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 14:47:04,285 INFO L82 PathProgramCache]: Analyzing trace with hash -280271430, now seen corresponding path program 1 times [2020-09-25 14:47:04,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 14:47:04,286 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1019831697] [2020-09-25 14:47:04,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 14:47:04,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:47:04,329 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:04,360 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:05,915 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:47:05,915 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 75 [2020-09-25 14:47:05,915 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-09-25 14:47:05,915 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1602 [2020-09-25 14:47:05,916 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:47:05,916 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:47:05,916 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-09-25 14:47:05,916 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 23 [2020-09-25 14:47:05,917 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 44 [2020-09-25 14:47:05,917 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:47:06,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 14:47:06,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:47:06,009 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:06,014 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:47:06,014 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 14:47:06,014 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:47:06,014 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-09-25 14:47:06,015 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:47:06,015 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:47:06,015 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 14:47:06,015 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 14:47:06,016 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 14:47:06,016 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:47:06,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2020-09-25 14:47:06,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:47:06,021 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:06,030 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:47:06,030 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-25 14:47:06,031 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:47:06,031 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 9 [2020-09-25 14:47:06,031 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:47:06,032 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:47:06,032 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-25 14:47:06,032 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 14:47:06,032 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-25 14:47:06,032 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:47:06,042 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-25 14:47:06,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1019831697] [2020-09-25 14:47:06,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-25 14:47:06,043 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-25 14:47:06,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273322181] [2020-09-25 14:47:06,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-25 14:47:06,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 14:47:06,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-25 14:47:06,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-09-25 14:47:06,045 INFO L87 Difference]: Start difference. First operand 100 states and 104 transitions. Second operand 10 states. [2020-09-25 14:47:06,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 14:47:06,346 INFO L93 Difference]: Finished difference Result 151 states and 156 transitions. [2020-09-25 14:47:06,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-25 14:47:06,347 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 64 [2020-09-25 14:47:06,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 14:47:06,348 INFO L225 Difference]: With dead ends: 151 [2020-09-25 14:47:06,348 INFO L226 Difference]: Without dead ends: 92 [2020-09-25 14:47:06,349 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2020-09-25 14:47:06,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-09-25 14:47:06,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 76. [2020-09-25 14:47:06,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-09-25 14:47:06,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-09-25 14:47:06,355 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 64 [2020-09-25 14:47:06,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 14:47:06,356 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-09-25 14:47:06,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-25 14:47:06,356 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-09-25 14:47:06,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-09-25 14:47:06,357 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 14:47:06,357 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-09-25 14:47:06,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-25 14:47:06,357 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 14:47:06,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 14:47:06,358 INFO L82 PathProgramCache]: Analyzing trace with hash 1930216728, now seen corresponding path program 4 times [2020-09-25 14:47:06,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 14:47:06,358 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [541789411] [2020-09-25 14:47:06,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 14:47:06,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:47:06,405 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:06,832 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:06,916 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:07,102 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:07,467 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:08,259 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:08,521 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:08,984 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:09,414 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:09,851 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:11,383 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:47:11,384 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 74 [2020-09-25 14:47:11,384 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 10 [2020-09-25 14:47:11,384 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5006 [2020-09-25 14:47:11,385 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:47:11,385 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:47:11,385 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 19 [2020-09-25 14:47:11,385 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 23 [2020-09-25 14:47:11,386 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 50 [2020-09-25 14:47:11,386 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:47:11,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 14:47:11,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:47:11,883 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:11,887 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:47:11,887 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 14:47:11,887 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:47:11,888 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-09-25 14:47:11,888 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:47:11,888 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:47:11,888 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 14:47:11,888 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 14:47:11,889 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 14:47:11,889 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:47:11,905 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 14:47:11,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [541789411] [2020-09-25 14:47:11,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-25 14:47:11,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-09-25 14:47:11,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856778131] [2020-09-25 14:47:11,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-25 14:47:11,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 14:47:11,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-25 14:47:11,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=377, Unknown=0, NotChecked=0, Total=420 [2020-09-25 14:47:11,909 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 21 states. [2020-09-25 14:47:13,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 14:47:13,867 INFO L93 Difference]: Finished difference Result 191 states and 200 transitions. [2020-09-25 14:47:13,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-09-25 14:47:13,868 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2020-09-25 14:47:13,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 14:47:13,870 INFO L225 Difference]: With dead ends: 191 [2020-09-25 14:47:13,870 INFO L226 Difference]: Without dead ends: 189 [2020-09-25 14:47:13,872 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 465 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=324, Invalid=2226, Unknown=0, NotChecked=0, Total=2550 [2020-09-25 14:47:13,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2020-09-25 14:47:13,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 117. [2020-09-25 14:47:13,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-09-25 14:47:13,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 121 transitions. [2020-09-25 14:47:13,881 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 121 transitions. Word has length 65 [2020-09-25 14:47:13,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 14:47:13,881 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 121 transitions. [2020-09-25 14:47:13,881 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-25 14:47:13,881 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 121 transitions. [2020-09-25 14:47:13,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-09-25 14:47:13,883 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 14:47:13,883 INFO L422 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1] [2020-09-25 14:47:13,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-25 14:47:13,883 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 14:47:13,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 14:47:13,884 INFO L82 PathProgramCache]: Analyzing trace with hash 499090838, now seen corresponding path program 5 times [2020-09-25 14:47:13,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 14:47:13,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1497189037] [2020-09-25 14:47:13,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 14:47:13,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:47:13,913 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:14,120 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:14,391 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:14,776 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:15,380 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:16,939 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:17,454 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:18,905 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:47:18,906 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 81 [2020-09-25 14:47:18,906 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 7 [2020-09-25 14:47:18,906 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5006 [2020-09-25 14:47:18,906 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:47:18,906 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:47:18,906 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 12 [2020-09-25 14:47:18,907 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 23 [2020-09-25 14:47:18,907 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 47 [2020-09-25 14:47:18,907 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-25 14:47:19,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 14:47:19,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:47:19,018 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:19,022 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:47:19,022 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 14:47:19,022 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:47:19,022 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-09-25 14:47:19,022 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:47:19,023 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:47:19,023 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 14:47:19,023 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 14:47:19,023 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 14:47:19,023 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-25 14:47:19,034 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 9 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 14:47:19,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1497189037] [2020-09-25 14:47:19,035 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-25 14:47:19,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-25 14:47:19,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123815576] [2020-09-25 14:47:19,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-25 14:47:19,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 14:47:19,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-25 14:47:19,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2020-09-25 14:47:19,038 INFO L87 Difference]: Start difference. First operand 117 states and 121 transitions. Second operand 11 states. [2020-09-25 14:47:19,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 14:47:19,562 INFO L93 Difference]: Finished difference Result 193 states and 202 transitions. [2020-09-25 14:47:19,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-09-25 14:47:19,562 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 72 [2020-09-25 14:47:19,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 14:47:19,565 INFO L225 Difference]: With dead ends: 193 [2020-09-25 14:47:19,565 INFO L226 Difference]: Without dead ends: 173 [2020-09-25 14:47:19,566 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=125, Invalid=381, Unknown=0, NotChecked=0, Total=506 [2020-09-25 14:47:19,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2020-09-25 14:47:19,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 127. [2020-09-25 14:47:19,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-09-25 14:47:19,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 131 transitions. [2020-09-25 14:47:19,575 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 131 transitions. Word has length 72 [2020-09-25 14:47:19,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 14:47:19,575 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 131 transitions. [2020-09-25 14:47:19,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-25 14:47:19,575 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 131 transitions. [2020-09-25 14:47:19,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-09-25 14:47:19,576 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 14:47:19,577 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2020-09-25 14:47:19,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-25 14:47:19,577 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 14:47:19,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 14:47:19,578 INFO L82 PathProgramCache]: Analyzing trace with hash 1430946398, now seen corresponding path program 6 times [2020-09-25 14:47:19,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 14:47:19,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2059345464] [2020-09-25 14:47:19,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 14:47:19,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:47:19,603 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:19,811 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:20,085 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:20,236 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:20,432 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:20,780 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:21,695 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:24,598 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:47:24,599 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 84 [2020-09-25 14:47:24,599 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 7 [2020-09-25 14:47:24,600 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5007 [2020-09-25 14:47:24,600 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:47:24,600 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:47:24,601 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 12 [2020-09-25 14:47:24,601 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 23 [2020-09-25 14:47:24,601 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 40 [2020-09-25 14:47:24,601 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:47:24,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 14:47:24,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 14:47:24,732 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 14:47:24,734 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 14:47:24,734 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 14:47:24,735 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 14:47:24,735 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-09-25 14:47:24,735 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 14:47:24,735 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.5 [2020-09-25 14:47:24,736 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 14:47:24,736 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 14:47:24,736 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 14:47:24,737 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 14:47:24,748 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 33 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 14:47:24,749 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2059345464] [2020-09-25 14:47:24,749 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-25 14:47:24,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-25 14:47:24,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032323717] [2020-09-25 14:47:24,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-25 14:47:24,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 14:47:24,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-25 14:47:24,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-09-25 14:47:24,751 INFO L87 Difference]: Start difference. First operand 127 states and 131 transitions. Second operand 12 states. [2020-09-25 14:47:25,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 14:47:25,214 INFO L93 Difference]: Finished difference Result 192 states and 199 transitions. [2020-09-25 14:47:25,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-09-25 14:47:25,215 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 75 [2020-09-25 14:47:25,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 14:47:25,216 INFO L225 Difference]: With dead ends: 192 [2020-09-25 14:47:25,216 INFO L226 Difference]: Without dead ends: 162 [2020-09-25 14:47:25,218 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=133, Invalid=419, Unknown=0, NotChecked=0, Total=552 [2020-09-25 14:47:25,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-09-25 14:47:25,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 127. [2020-09-25 14:47:25,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-09-25 14:47:25,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 130 transitions. [2020-09-25 14:47:25,226 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 130 transitions. Word has length 75 [2020-09-25 14:47:25,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 14:47:25,227 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 130 transitions. [2020-09-25 14:47:25,227 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-25 14:47:25,227 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 130 transitions. [2020-09-25 14:47:25,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-09-25 14:47:25,228 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 14:47:25,228 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 14:47:25,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-25 14:47:25,229 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 14:47:25,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 14:47:25,229 INFO L82 PathProgramCache]: Analyzing trace with hash 810536514, now seen corresponding path program 2 times [2020-09-25 14:47:25,229 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 14:47:25,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1240588615] [2020-09-25 14:47:25,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 14:47:25,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-25 14:47:25,249 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-25 14:47:25,249 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-25 14:47:25,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-25 14:47:25,275 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.09 02:47:25 BoogieIcfgContainer [2020-09-25 14:47:25,275 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-25 14:47:25,278 INFO L168 Benchmark]: Toolchain (without parser) took 44709.50 ms. Allocated memory was 140.5 MB in the beginning and 428.9 MB in the end (delta: 288.4 MB). Free memory was 104.0 MB in the beginning and 314.1 MB in the end (delta: -210.1 MB). Peak memory consumption was 78.2 MB. Max. memory is 7.1 GB. [2020-09-25 14:47:25,278 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-09-25 14:47:25,279 INFO L168 Benchmark]: CACSL2BoogieTranslator took 327.30 ms. Allocated memory is still 140.5 MB. Free memory was 103.4 MB in the beginning and 92.8 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2020-09-25 14:47:25,280 INFO L168 Benchmark]: Boogie Preprocessor took 124.71 ms. Allocated memory was 140.5 MB in the beginning and 202.9 MB in the end (delta: 62.4 MB). Free memory was 92.8 MB in the beginning and 180.6 MB in the end (delta: -87.8 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-09-25 14:47:25,281 INFO L168 Benchmark]: RCFGBuilder took 478.88 ms. Allocated memory is still 202.9 MB. Free memory was 180.6 MB in the beginning and 161.3 MB in the end (delta: 19.4 MB). Peak memory consumption was 19.4 MB. Max. memory is 7.1 GB. [2020-09-25 14:47:25,282 INFO L168 Benchmark]: TraceAbstraction took 43768.58 ms. Allocated memory was 202.9 MB in the beginning and 428.9 MB in the end (delta: 226.0 MB). Free memory was 161.3 MB in the beginning and 314.1 MB in the end (delta: -152.9 MB). Peak memory consumption was 73.1 MB. Max. memory is 7.1 GB. [2020-09-25 14:47:25,285 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 327.30 ms. Allocated memory is still 140.5 MB. Free memory was 103.4 MB in the beginning and 92.8 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 124.71 ms. Allocated memory was 140.5 MB in the beginning and 202.9 MB in the end (delta: 62.4 MB). Free memory was 92.8 MB in the beginning and 180.6 MB in the end (delta: -87.8 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 478.88 ms. Allocated memory is still 202.9 MB. Free memory was 180.6 MB in the beginning and 161.3 MB in the end (delta: 19.4 MB). Peak memory consumption was 19.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 43768.58 ms. Allocated memory was 202.9 MB in the beginning and 428.9 MB in the end (delta: 226.0 MB). Free memory was 161.3 MB in the beginning and 314.1 MB in the end (delta: -152.9 MB). Peak memory consumption was 73.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int MAX = __VERIFIER_nondet_uint(); [L15] COND FALSE !(!(MAX > 0)) [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND FALSE !(i >= 0) [L32] j = MAX-1 [L33] i=0 [L33] COND TRUE i