/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench/mannadiv.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 20:53:26,991 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 20:53:26,994 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 20:53:27,006 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 20:53:27,007 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 20:53:27,008 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 20:53:27,009 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 20:53:27,011 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 20:53:27,013 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 20:53:27,013 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 20:53:27,014 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 20:53:27,015 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 20:53:27,016 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 20:53:27,017 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 20:53:27,018 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 20:53:27,019 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 20:53:27,019 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 20:53:27,020 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 20:53:27,022 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 20:53:27,024 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 20:53:27,025 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 20:53:27,026 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 20:53:27,028 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 20:53:27,028 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 20:53:27,031 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 20:53:27,031 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 20:53:27,031 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 20:53:27,032 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 20:53:27,032 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 20:53:27,033 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 20:53:27,034 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 20:53:27,034 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 20:53:27,035 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 20:53:27,036 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 20:53:27,037 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 20:53:27,037 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 20:53:27,038 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 20:53:27,038 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 20:53:27,038 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 20:53:27,039 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 20:53:27,040 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 20:53:27,040 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 20:53:27,054 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 20:53:27,055 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 20:53:27,056 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 20:53:27,056 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 20:53:27,056 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 20:53:27,057 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 20:53:27,057 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 20:53:27,057 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 20:53:27,057 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 20:53:27,057 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 20:53:27,058 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 20:53:27,058 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 20:53:27,058 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 20:53:27,058 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 20:53:27,058 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 20:53:27,059 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 20:53:27,059 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 20:53:27,059 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 20:53:27,059 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 20:53:27,059 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 20:53:27,060 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 20:53:27,060 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 20:53:27,060 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 20:53:27,060 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 20:53:27,061 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 20:53:27,061 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 20:53:27,061 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:27,061 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 20:53:27,061 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 20:53:27,061 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 -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 20:53:27,375 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 20:53:27,389 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 20:53:27,392 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 20:53:27,394 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 20:53:27,394 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 20:53:27,395 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/mannadiv.c [2020-07-21 20:53:27,474 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/37c5b7f51/04f635cfb6854dad891397e7c84dc128/FLAG82f4e3a1c [2020-07-21 20:53:27,923 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 20:53:27,923 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/mannadiv.c [2020-07-21 20:53:27,929 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/37c5b7f51/04f635cfb6854dad891397e7c84dc128/FLAG82f4e3a1c [2020-07-21 20:53:28,305 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/37c5b7f51/04f635cfb6854dad891397e7c84dc128 [2020-07-21 20:53:28,314 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 20:53:28,317 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 20:53:28,318 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 20:53:28,318 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 20:53:28,323 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 20:53:28,324 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:53:28" (1/1) ... [2020-07-21 20:53:28,327 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55fc409a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:53:28, skipping insertion in model container [2020-07-21 20:53:28,327 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:53:28" (1/1) ... [2020-07-21 20:53:28,336 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 20:53:28,354 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 20:53:28,527 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:53:28,532 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 20:53:28,551 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:53:28,566 INFO L208 MainTranslator]: Completed translation [2020-07-21 20:53:28,567 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:53:28 WrapperNode [2020-07-21 20:53:28,567 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 20:53:28,568 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 20:53:28,568 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 20:53:28,568 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 20:53:28,582 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:53:28" (1/1) ... [2020-07-21 20:53:28,583 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:53:28" (1/1) ... [2020-07-21 20:53:28,588 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:53:28" (1/1) ... [2020-07-21 20:53:28,589 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:53:28" (1/1) ... [2020-07-21 20:53:28,593 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:53:28" (1/1) ... [2020-07-21 20:53:28,598 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:53:28" (1/1) ... [2020-07-21 20:53:28,599 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:53:28" (1/1) ... [2020-07-21 20:53:28,685 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 20:53:28,686 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 20:53:28,686 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 20:53:28,686 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 20:53:28,689 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:53:28" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2020-07-21 20:53:28,758 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 20:53:28,758 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 20:53:28,758 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 20:53:28,758 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 20:53:28,758 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 20:53:28,759 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 20:53:28,759 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 20:53:28,759 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 20:53:28,759 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 20:53:28,759 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 20:53:28,759 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 20:53:28,760 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 20:53:28,760 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 20:53:28,969 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 20:53:28,969 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 20:53:28,973 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:53:28 BoogieIcfgContainer [2020-07-21 20:53:28,973 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 20:53:28,974 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 20:53:28,975 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 20:53:28,978 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 20:53:28,978 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 08:53:28" (1/3) ... [2020-07-21 20:53:28,979 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9e48014 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:53:28, skipping insertion in model container [2020-07-21 20:53:28,979 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:53:28" (2/3) ... [2020-07-21 20:53:28,979 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9e48014 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:53:28, skipping insertion in model container [2020-07-21 20:53:28,980 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:53:28" (3/3) ... [2020-07-21 20:53:28,981 INFO L109 eAbstractionObserver]: Analyzing ICFG mannadiv.c [2020-07-21 20:53:28,990 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 20:53:28,997 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 20:53:29,011 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 20:53:29,034 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 20:53:29,034 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 20:53:29,035 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 20:53:29,035 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 20:53:29,035 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 20:53:29,035 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 20:53:29,035 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 20:53:29,035 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 20:53:29,052 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-21 20:53:29,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 20:53:29,059 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:53:29,060 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:53:29,061 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:53:29,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:53:29,066 INFO L82 PathProgramCache]: Analyzing trace with hash -849943384, now seen corresponding path program 1 times [2020-07-21 20:53:29,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:53:29,073 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1786524506] [2020-07-21 20:53:29,073 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:29,140 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:53:29,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:53:29,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 20:53:29,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:53:29,172 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 20:53:29,172 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:53:29,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1786524506] [2020-07-21 20:53:29,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:53:29,175 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 20:53:29,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309485047] [2020-07-21 20:53:29,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 20:53:29,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:53:29,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 20:53:29,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 20:53:29,198 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 2 states. [2020-07-21 20:53:29,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:53:29,225 INFO L93 Difference]: Finished difference Result 50 states and 67 transitions. [2020-07-21 20:53:29,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 20:53:29,227 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 21 [2020-07-21 20:53:29,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:53:29,238 INFO L225 Difference]: With dead ends: 50 [2020-07-21 20:53:29,239 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 20:53:29,243 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 20:53:29,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 20:53:29,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-21 20:53:29,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-21 20:53:29,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2020-07-21 20:53:29,286 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 21 [2020-07-21 20:53:29,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:53:29,286 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2020-07-21 20:53:29,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 20:53:29,287 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2020-07-21 20:53:29,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 20:53:29,288 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:53:29,289 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:53:29,489 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:29,490 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:53:29,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:53:29,491 INFO L82 PathProgramCache]: Analyzing trace with hash -1193991140, now seen corresponding path program 1 times [2020-07-21 20:53:29,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:53:29,492 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [564763959] [2020-07-21 20:53:29,493 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:29,529 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:53:29,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:53:29,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 20:53:29,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:53:29,672 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 20:53:29,673 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:53:29,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [564763959] [2020-07-21 20:53:29,674 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:53:29,674 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 20:53:29,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142539428] [2020-07-21 20:53:29,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 20:53:29,677 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:53:29,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 20:53:29,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-21 20:53:29,678 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 8 states. [2020-07-21 20:53:29,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:53:29,918 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-07-21 20:53:29,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 20:53:29,919 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-07-21 20:53:29,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:53:29,921 INFO L225 Difference]: With dead ends: 34 [2020-07-21 20:53:29,922 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 20:53:29,923 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 20:53:29,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 20:53:29,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2020-07-21 20:53:29,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 20:53:29,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-07-21 20:53:29,934 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 21 [2020-07-21 20:53:29,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:53:29,936 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-07-21 20:53:29,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 20:53:29,936 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-07-21 20:53:29,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 20:53:29,937 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:53:29,937 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:53:30,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:30,142 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:53:30,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:53:30,144 INFO L82 PathProgramCache]: Analyzing trace with hash -1415100442, now seen corresponding path program 1 times [2020-07-21 20:53:30,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:53:30,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [980651307] [2020-07-21 20:53:30,145 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:30,196 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:53:30,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:53:30,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 20:53:30,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:53:30,304 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 20:53:30,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:53:30,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:53:30,408 INFO L320 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-07-21 20:53:30,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:53:30,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:53:30,462 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 20:53:30,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [980651307] [2020-07-21 20:53:30,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:53:30,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2020-07-21 20:53:30,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682702407] [2020-07-21 20:53:30,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 20:53:30,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:53:30,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 20:53:30,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-07-21 20:53:30,465 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 10 states. [2020-07-21 20:53:32,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:53:32,635 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-07-21 20:53:32,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 20:53:32,636 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 20:53:32,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:53:32,642 INFO L225 Difference]: With dead ends: 37 [2020-07-21 20:53:32,642 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 20:53:32,643 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2020-07-21 20:53:32,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 20:53:32,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2020-07-21 20:53:32,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 20:53:32,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-07-21 20:53:32,659 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 27 [2020-07-21 20:53:32,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:53:32,660 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-07-21 20:53:32,660 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 20:53:32,660 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-07-21 20:53:32,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 20:53:32,663 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:53:32,663 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:53:32,876 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:32,877 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:53:32,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:53:32,877 INFO L82 PathProgramCache]: Analyzing trace with hash -1831429119, now seen corresponding path program 1 times [2020-07-21 20:53:32,878 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:53:32,878 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1716520854] [2020-07-21 20:53:32,878 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:32,924 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:53:32,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:53:32,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 20:53:32,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:53:32,991 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 20:53:32,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:53:33,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:53:33,070 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 20:53:33,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1716520854] [2020-07-21 20:53:33,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:53:33,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-21 20:53:33,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458824063] [2020-07-21 20:53:33,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 20:53:33,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:53:33,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 20:53:33,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 20:53:33,073 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2020-07-21 20:53:37,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:53:37,479 INFO L93 Difference]: Finished difference Result 72 states and 84 transitions. [2020-07-21 20:53:37,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 20:53:37,480 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-21 20:53:37,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:53:37,482 INFO L225 Difference]: With dead ends: 72 [2020-07-21 20:53:37,482 INFO L226 Difference]: Without dead ends: 56 [2020-07-21 20:53:37,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-07-21 20:53:37,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-07-21 20:53:37,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-07-21 20:53:37,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 20:53:37,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 65 transitions. [2020-07-21 20:53:37,507 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 65 transitions. Word has length 29 [2020-07-21 20:53:37,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:53:37,508 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 65 transitions. [2020-07-21 20:53:37,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 20:53:37,508 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 65 transitions. [2020-07-21 20:53:37,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-21 20:53:37,512 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:53:37,512 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:53:37,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:37,727 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:53:37,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:53:37,728 INFO L82 PathProgramCache]: Analyzing trace with hash 802873865, now seen corresponding path program 1 times [2020-07-21 20:53:37,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:53:37,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [806293059] [2020-07-21 20:53:37,730 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:37,764 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:53:37,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:53:37,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 20:53:37,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:53:37,806 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 20:53:37,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:53:37,869 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 20:53:37,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [806293059] [2020-07-21 20:53:37,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:53:37,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-07-21 20:53:37,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365144743] [2020-07-21 20:53:37,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 20:53:37,871 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:53:37,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 20:53:37,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 20:53:37,871 INFO L87 Difference]: Start difference. First operand 56 states and 65 transitions. Second operand 6 states. [2020-07-21 20:53:37,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:53:37,942 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2020-07-21 20:53:37,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 20:53:37,943 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 45 [2020-07-21 20:53:37,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:53:37,945 INFO L225 Difference]: With dead ends: 86 [2020-07-21 20:53:37,945 INFO L226 Difference]: Without dead ends: 70 [2020-07-21 20:53:37,946 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-07-21 20:53:37,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-21 20:53:37,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-07-21 20:53:37,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 20:53:37,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2020-07-21 20:53:37,962 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 45 [2020-07-21 20:53:37,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:53:37,962 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2020-07-21 20:53:37,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 20:53:37,963 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2020-07-21 20:53:37,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-21 20:53:37,965 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:53:37,965 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:53:38,179 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:38,180 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:53:38,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:53:38,181 INFO L82 PathProgramCache]: Analyzing trace with hash -208243385, now seen corresponding path program 2 times [2020-07-21 20:53:38,181 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:53:38,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2036453807] [2020-07-21 20:53:38,182 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:38,216 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:53:38,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:53:38,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 20:53:38,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:53:38,330 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 20:53:38,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:53:38,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:53:38,571 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 20:53:38,571 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2036453807] [2020-07-21 20:53:38,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:53:38,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2020-07-21 20:53:38,572 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077029484] [2020-07-21 20:53:38,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 20:53:38,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:53:38,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 20:53:38,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-07-21 20:53:38,574 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand 12 states. [2020-07-21 20:53:49,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:53:49,384 INFO L93 Difference]: Finished difference Result 124 states and 150 transitions. [2020-07-21 20:53:49,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 20:53:49,416 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 45 [2020-07-21 20:53:49,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:53:49,418 INFO L225 Difference]: With dead ends: 124 [2020-07-21 20:53:49,419 INFO L226 Difference]: Without dead ends: 122 [2020-07-21 20:53:49,419 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2020-07-21 20:53:49,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-21 20:53:49,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 112. [2020-07-21 20:53:49,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-21 20:53:49,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 136 transitions. [2020-07-21 20:53:49,443 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 136 transitions. Word has length 45 [2020-07-21 20:53:49,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:53:49,443 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 136 transitions. [2020-07-21 20:53:49,443 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 20:53:49,443 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 136 transitions. [2020-07-21 20:53:49,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 20:53:49,446 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:53:49,446 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:53:49,650 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:49,651 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:53:49,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:53:49,652 INFO L82 PathProgramCache]: Analyzing trace with hash -53426768, now seen corresponding path program 2 times [2020-07-21 20:53:49,652 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:53:49,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1622474866] [2020-07-21 20:53:49,653 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:49,689 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:53:49,690 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:53:49,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-21 20:53:49,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:53:49,899 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 20:53:49,899 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:53:49,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:53:50,377 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 20:53:50,377 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1622474866] [2020-07-21 20:53:50,377 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:53:50,377 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-21 20:53:50,378 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704744808] [2020-07-21 20:53:50,378 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 20:53:50,378 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:53:50,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 20:53:50,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2020-07-21 20:53:50,379 INFO L87 Difference]: Start difference. First operand 112 states and 136 transitions. Second operand 14 states. [2020-07-21 20:53:50,638 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 20:53:54,032 WARN L193 SmtUtils]: Spent 703.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 20:53:54,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:53:54,090 INFO L93 Difference]: Finished difference Result 156 states and 183 transitions. [2020-07-21 20:53:54,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 20:53:54,094 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 53 [2020-07-21 20:53:54,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:53:54,096 INFO L225 Difference]: With dead ends: 156 [2020-07-21 20:53:54,096 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 20:53:54,097 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2020-07-21 20:53:54,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 20:53:54,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2020-07-21 20:53:54,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-21 20:53:54,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 115 transitions. [2020-07-21 20:53:54,114 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 115 transitions. Word has length 53 [2020-07-21 20:53:54,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:53:54,115 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 115 transitions. [2020-07-21 20:53:54,115 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 20:53:54,115 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 115 transitions. [2020-07-21 20:53:54,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-21 20:53:54,117 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:53:54,117 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:53:54,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:54,328 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:53:54,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:53:54,329 INFO L82 PathProgramCache]: Analyzing trace with hash 10333007, now seen corresponding path program 3 times [2020-07-21 20:53:54,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:53:54,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [926905721] [2020-07-21 20:53:54,330 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:54,374 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:53:54,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:53:54,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 20:53:54,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:53:54,429 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-21 20:53:54,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:53:54,513 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-21 20:53:54,513 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [926905721] [2020-07-21 20:53:54,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:53:54,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 20:53:54,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483012142] [2020-07-21 20:53:54,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 20:53:54,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:53:54,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 20:53:54,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-07-21 20:53:54,520 INFO L87 Difference]: Start difference. First operand 98 states and 115 transitions. Second operand 10 states. [2020-07-21 20:53:54,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:53:54,662 INFO L93 Difference]: Finished difference Result 148 states and 180 transitions. [2020-07-21 20:53:54,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 20:53:54,669 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 61 [2020-07-21 20:53:54,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:53:54,670 INFO L225 Difference]: With dead ends: 148 [2020-07-21 20:53:54,671 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 20:53:54,672 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2020-07-21 20:53:54,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 20:53:54,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2020-07-21 20:53:54,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-21 20:53:54,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 138 transitions. [2020-07-21 20:53:54,698 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 138 transitions. Word has length 61 [2020-07-21 20:53:54,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:53:54,698 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 138 transitions. [2020-07-21 20:53:54,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 20:53:54,698 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 138 transitions. [2020-07-21 20:53:54,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-21 20:53:54,700 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:53:54,700 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:53:54,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:54,916 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:53:54,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:53:54,916 INFO L82 PathProgramCache]: Analyzing trace with hash -185889457, now seen corresponding path program 4 times [2020-07-21 20:53:54,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:53:54,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1008641116] [2020-07-21 20:53:54,917 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:54,950 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:53:54,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:53:54,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 20:53:54,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:53:54,998 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-21 20:53:54,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:53:55,081 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-21 20:53:55,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1008641116] [2020-07-21 20:53:55,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:53:55,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 20:53:55,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831953755] [2020-07-21 20:53:55,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 20:53:55,082 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:53:55,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 20:53:55,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 20:53:55,083 INFO L87 Difference]: Start difference. First operand 116 states and 138 transitions. Second operand 9 states. [2020-07-21 20:53:55,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:53:55,256 INFO L93 Difference]: Finished difference Result 134 states and 156 transitions. [2020-07-21 20:53:55,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 20:53:55,258 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 61 [2020-07-21 20:53:55,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:53:55,262 INFO L225 Difference]: With dead ends: 134 [2020-07-21 20:53:55,262 INFO L226 Difference]: Without dead ends: 116 [2020-07-21 20:53:55,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 111 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-07-21 20:53:55,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-21 20:53:55,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2020-07-21 20:53:55,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-21 20:53:55,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 135 transitions. [2020-07-21 20:53:55,299 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 135 transitions. Word has length 61 [2020-07-21 20:53:55,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:53:55,299 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 135 transitions. [2020-07-21 20:53:55,299 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 20:53:55,300 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 135 transitions. [2020-07-21 20:53:55,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-21 20:53:55,305 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:53:55,307 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:53:55,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:55,508 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:53:55,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:53:55,508 INFO L82 PathProgramCache]: Analyzing trace with hash -377856460, now seen corresponding path program 5 times [2020-07-21 20:53:55,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:53:55,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [264694794] [2020-07-21 20:53:55,509 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:53:55,553 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:53:55,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:53:55,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-21 20:53:55,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:53:56,076 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 12 proven. 72 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-21 20:53:56,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:53:56,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:53:57,075 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 12 proven. 72 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-21 20:53:57,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [264694794] [2020-07-21 20:53:57,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:53:57,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2020-07-21 20:53:57,077 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064298768] [2020-07-21 20:53:57,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 20:53:57,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:53:57,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 20:53:57,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-07-21 20:53:57,078 INFO L87 Difference]: Start difference. First operand 116 states and 135 transitions. Second operand 18 states. [2020-07-21 20:53:57,904 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-21 20:53:58,702 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 20:54:01,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:54:01,270 INFO L93 Difference]: Finished difference Result 140 states and 156 transitions. [2020-07-21 20:54:01,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 20:54:01,271 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 69 [2020-07-21 20:54:01,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:54:01,273 INFO L225 Difference]: With dead ends: 140 [2020-07-21 20:54:01,273 INFO L226 Difference]: Without dead ends: 86 [2020-07-21 20:54:01,274 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 119 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2020-07-21 20:54:01,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-21 20:54:01,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2020-07-21 20:54:01,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-21 20:54:01,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 100 transitions. [2020-07-21 20:54:01,285 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 100 transitions. Word has length 69 [2020-07-21 20:54:01,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:54:01,286 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 100 transitions. [2020-07-21 20:54:01,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 20:54:01,286 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 100 transitions. [2020-07-21 20:54:01,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-07-21 20:54:01,287 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:54:01,288 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:54:01,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:54:01,502 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:54:01,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:54:01,503 INFO L82 PathProgramCache]: Analyzing trace with hash 728435349, now seen corresponding path program 6 times [2020-07-21 20:54:01,503 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:54:01,504 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315366816] [2020-07-21 20:54:01,504 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:54:01,538 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:54:01,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:54:01,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 20:54:01,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:54:01,655 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 20:54:01,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:54:01,775 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 20:54:01,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315366816] [2020-07-21 20:54:01,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:54:01,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 13 [2020-07-21 20:54:01,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777066778] [2020-07-21 20:54:01,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 20:54:01,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:54:01,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 20:54:01,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2020-07-21 20:54:01,778 INFO L87 Difference]: Start difference. First operand 86 states and 100 transitions. Second operand 13 states. [2020-07-21 20:54:02,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:54:02,087 INFO L93 Difference]: Finished difference Result 148 states and 180 transitions. [2020-07-21 20:54:02,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 20:54:02,091 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 77 [2020-07-21 20:54:02,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:54:02,094 INFO L225 Difference]: With dead ends: 148 [2020-07-21 20:54:02,094 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 20:54:02,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 139 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-21 20:54:02,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 20:54:02,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2020-07-21 20:54:02,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-21 20:54:02,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 139 transitions. [2020-07-21 20:54:02,117 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 139 transitions. Word has length 77 [2020-07-21 20:54:02,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:54:02,119 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 139 transitions. [2020-07-21 20:54:02,119 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 20:54:02,119 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 139 transitions. [2020-07-21 20:54:02,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-07-21 20:54:02,120 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:54:02,121 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:54:02,333 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:54:02,334 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:54:02,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:54:02,335 INFO L82 PathProgramCache]: Analyzing trace with hash -323556203, now seen corresponding path program 7 times [2020-07-21 20:54:02,335 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:54:02,335 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [446136618] [2020-07-21 20:54:02,335 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:54:02,380 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:54:02,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:54:02,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 20:54:02,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:54:02,457 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 20:54:02,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:54:02,564 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 20:54:02,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [446136618] [2020-07-21 20:54:02,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:54:02,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 20:54:02,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509904921] [2020-07-21 20:54:02,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 20:54:02,567 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:54:02,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 20:54:02,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2020-07-21 20:54:02,568 INFO L87 Difference]: Start difference. First operand 116 states and 139 transitions. Second operand 12 states. [2020-07-21 20:54:02,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:54:02,951 INFO L93 Difference]: Finished difference Result 138 states and 162 transitions. [2020-07-21 20:54:02,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 20:54:02,954 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 77 [2020-07-21 20:54:02,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:54:02,956 INFO L225 Difference]: With dead ends: 138 [2020-07-21 20:54:02,956 INFO L226 Difference]: Without dead ends: 116 [2020-07-21 20:54:02,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 139 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2020-07-21 20:54:02,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-21 20:54:02,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2020-07-21 20:54:02,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-21 20:54:02,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 137 transitions. [2020-07-21 20:54:02,969 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 137 transitions. Word has length 77 [2020-07-21 20:54:02,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:54:02,970 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 137 transitions. [2020-07-21 20:54:02,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 20:54:02,970 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 137 transitions. [2020-07-21 20:54:02,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-21 20:54:02,971 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:54:02,972 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 8, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:54:03,185 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:54:03,186 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:54:03,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:54:03,186 INFO L82 PathProgramCache]: Analyzing trace with hash -1534824776, now seen corresponding path program 8 times [2020-07-21 20:54:03,187 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:54:03,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [765901761] [2020-07-21 20:54:03,187 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:54:03,234 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:54:03,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:54:03,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-21 20:54:03,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:54:03,812 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 16 proven. 128 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-21 20:54:03,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:54:03,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:54:06,067 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 16 proven. 128 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-21 20:54:06,068 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [765901761] [2020-07-21 20:54:06,068 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:54:06,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-21 20:54:06,069 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543573770] [2020-07-21 20:54:06,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 20:54:06,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:54:06,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 20:54:06,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=406, Unknown=0, NotChecked=0, Total=462 [2020-07-21 20:54:06,070 INFO L87 Difference]: Start difference. First operand 116 states and 137 transitions. Second operand 22 states. [2020-07-21 20:54:18,094 WARN L193 SmtUtils]: Spent 897.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-21 20:54:22,880 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-21 20:54:25,492 WARN L193 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 20:54:26,710 WARN L193 SmtUtils]: Spent 827.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 21 [2020-07-21 20:54:29,120 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* c_main_~y1~0 c_main_~x2~0))) (and (= (+ (* 2 c_main_~y2~0) (* 3 c_main_~y1~0) c_main_~y3~0 (* c_main_~y2~0 c_main_~y1~0)) (+ c_main_~x1~0 1)) (= (+ c_main_~x1~0 3) (+ c_main_~x2~0 c_main_~y3~0 .cse0)) (= (+ c_main_~y2~0 c_main_~y3~0 .cse0) c_main_~x1~0))) is different from false [2020-07-21 20:54:38,298 WARN L193 SmtUtils]: Spent 374.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 20:54:45,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:54:45,977 INFO L93 Difference]: Finished difference Result 236 states and 280 transitions. [2020-07-21 20:54:45,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 20:54:45,982 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 85 [2020-07-21 20:54:45,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:54:45,984 INFO L225 Difference]: With dead ends: 236 [2020-07-21 20:54:45,984 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 20:54:45,985 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 147 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=122, Invalid=1002, Unknown=2, NotChecked=64, Total=1190 [2020-07-21 20:54:45,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 20:54:46,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 200. [2020-07-21 20:54:46,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-21 20:54:46,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 237 transitions. [2020-07-21 20:54:46,006 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 237 transitions. Word has length 85 [2020-07-21 20:54:46,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:54:46,006 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 237 transitions. [2020-07-21 20:54:46,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 20:54:46,007 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 237 transitions. [2020-07-21 20:54:46,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-21 20:54:46,008 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:54:46,008 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 6, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:54:46,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:54:46,212 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:54:46,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:54:46,212 INFO L82 PathProgramCache]: Analyzing trace with hash -2106989411, now seen corresponding path program 9 times [2020-07-21 20:54:46,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:54:46,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1226220606] [2020-07-21 20:54:46,213 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:54:46,258 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:54:46,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:54:46,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-21 20:54:46,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:54:47,310 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 20:54:47,735 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 20:54:48,212 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 20:54:48,618 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-21 20:54:49,176 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 18 proven. 162 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-21 20:54:49,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:54:49,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:54:57,749 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 18 proven. 162 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-21 20:54:57,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1226220606] [2020-07-21 20:54:57,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:54:57,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 24 [2020-07-21 20:54:57,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938069053] [2020-07-21 20:54:57,751 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 20:54:57,751 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:54:57,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 20:54:57,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-07-21 20:54:57,753 INFO L87 Difference]: Start difference. First operand 200 states and 237 transitions. Second operand 24 states. [2020-07-21 20:55:00,223 WARN L193 SmtUtils]: Spent 1.00 s on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 20:55:01,405 WARN L193 SmtUtils]: Spent 604.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-21 20:55:02,376 WARN L193 SmtUtils]: Spent 357.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 20:55:06,357 WARN L193 SmtUtils]: Spent 376.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 20:55:08,091 WARN L193 SmtUtils]: Spent 852.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 20:55:09,558 WARN L193 SmtUtils]: Spent 487.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 20:55:13,420 WARN L193 SmtUtils]: Spent 2.85 s on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 20:55:15,705 WARN L193 SmtUtils]: Spent 1.15 s on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-21 20:55:17,174 WARN L193 SmtUtils]: Spent 470.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-21 20:55:17,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:55:17,312 INFO L93 Difference]: Finished difference Result 224 states and 258 transitions. [2020-07-21 20:55:17,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 20:55:17,322 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 93 [2020-07-21 20:55:17,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:55:17,325 INFO L225 Difference]: With dead ends: 224 [2020-07-21 20:55:17,326 INFO L226 Difference]: Without dead ends: 166 [2020-07-21 20:55:17,327 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 24.8s TimeCoverageRelationStatistics Valid=138, Invalid=984, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 20:55:17,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-07-21 20:55:17,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2020-07-21 20:55:17,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2020-07-21 20:55:17,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 193 transitions. [2020-07-21 20:55:17,356 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 193 transitions. Word has length 93 [2020-07-21 20:55:17,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:55:17,356 INFO L479 AbstractCegarLoop]: Abstraction has 166 states and 193 transitions. [2020-07-21 20:55:17,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 20:55:17,356 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 193 transitions. [2020-07-21 20:55:17,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-21 20:55:17,359 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:55:17,359 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 7, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:55:17,572 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:55:17,573 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:55:17,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:55:17,574 INFO L82 PathProgramCache]: Analyzing trace with hash -178978853, now seen corresponding path program 10 times [2020-07-21 20:55:17,574 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:55:17,574 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [782962590] [2020-07-21 20:55:17,575 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:55:17,608 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:55:17,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:55:17,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 20:55:17,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:55:17,701 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 76 proven. 104 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-21 20:55:17,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:55:17,838 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 76 proven. 104 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-21 20:55:17,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [782962590] [2020-07-21 20:55:17,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:55:17,839 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2020-07-21 20:55:17,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765525551] [2020-07-21 20:55:17,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 20:55:17,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:55:17,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 20:55:17,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-07-21 20:55:17,840 INFO L87 Difference]: Start difference. First operand 166 states and 193 transitions. Second operand 15 states. [2020-07-21 20:55:18,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:55:18,485 INFO L93 Difference]: Finished difference Result 220 states and 261 transitions. [2020-07-21 20:55:18,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 20:55:18,490 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 93 [2020-07-21 20:55:18,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:55:18,492 INFO L225 Difference]: With dead ends: 220 [2020-07-21 20:55:18,492 INFO L226 Difference]: Without dead ends: 194 [2020-07-21 20:55:18,493 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 167 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=121, Invalid=341, Unknown=0, NotChecked=0, Total=462 [2020-07-21 20:55:18,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2020-07-21 20:55:18,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 194. [2020-07-21 20:55:18,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2020-07-21 20:55:18,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 230 transitions. [2020-07-21 20:55:18,510 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 230 transitions. Word has length 93 [2020-07-21 20:55:18,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:55:18,511 INFO L479 AbstractCegarLoop]: Abstraction has 194 states and 230 transitions. [2020-07-21 20:55:18,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 20:55:18,511 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 230 transitions. [2020-07-21 20:55:18,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-07-21 20:55:18,512 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:55:18,512 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 8, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:55:18,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:55:18,713 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:55:18,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:55:18,714 INFO L82 PathProgramCache]: Analyzing trace with hash -837428226, now seen corresponding path program 11 times [2020-07-21 20:55:18,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:55:18,715 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611755619] [2020-07-21 20:55:18,715 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:55:18,764 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:55:18,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:55:18,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 45 conjunts are in the unsatisfiable core [2020-07-21 20:55:18,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:55:19,599 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 20:55:19,960 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 20:55:20,351 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 20:55:20,772 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 20:55:21,425 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 20:55:22,034 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 20 proven. 200 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-21 20:55:22,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:55:22,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:55:35,001 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 20 proven. 200 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-21 20:55:35,001 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611755619] [2020-07-21 20:55:35,001 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:55:35,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2020-07-21 20:55:35,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173615510] [2020-07-21 20:55:35,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 20:55:35,002 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:55:35,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 20:55:35,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=583, Unknown=0, NotChecked=0, Total=650 [2020-07-21 20:55:35,003 INFO L87 Difference]: Start difference. First operand 194 states and 230 transitions. Second operand 26 states. [2020-07-21 20:56:01,288 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 20:56:02,324 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 20:56:03,119 WARN L193 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 20:56:10,566 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 20:56:15,286 WARN L193 SmtUtils]: Spent 400.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 20:56:20,563 WARN L193 SmtUtils]: Spent 414.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 20:56:55,360 WARN L193 SmtUtils]: Spent 7.40 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-21 20:57:15,074 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* c_main_~y1~0 c_main_~x2~0))) (and (= (+ c_main_~x1~0 3) (+ c_main_~x2~0 c_main_~y3~0 .cse0)) (= (+ (* 2 c_main_~y2~0) (* 3 c_main_~y1~0) c_main_~y3~0 (* c_main_~y2~0 c_main_~y1~0)) (+ c_main_~x1~0 2)) (= (+ c_main_~y2~0 c_main_~y3~0 .cse0) c_main_~x1~0))) is different from false [2020-07-21 20:57:20,242 WARN L193 SmtUtils]: Spent 1.19 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 20:57:29,299 WARN L193 SmtUtils]: Spent 783.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 20:57:51,899 WARN L193 SmtUtils]: Spent 321.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 20:57:58,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:57:58,114 INFO L93 Difference]: Finished difference Result 340 states and 402 transitions. [2020-07-21 20:57:58,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 20:57:58,121 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 101 [2020-07-21 20:57:58,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:57:58,123 INFO L225 Difference]: With dead ends: 340 [2020-07-21 20:57:58,123 INFO L226 Difference]: Without dead ends: 302 [2020-07-21 20:57:58,125 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 175 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 90.6s TimeCoverageRelationStatistics Valid=151, Invalid=1484, Unknown=9, NotChecked=78, Total=1722 [2020-07-21 20:57:58,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2020-07-21 20:57:58,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 302. [2020-07-21 20:57:58,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-07-21 20:57:58,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 356 transitions. [2020-07-21 20:57:58,157 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 356 transitions. Word has length 101 [2020-07-21 20:57:58,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:57:58,158 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 356 transitions. [2020-07-21 20:57:58,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 20:57:58,158 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 356 transitions. [2020-07-21 20:57:58,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 20:57:58,159 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:57:58,160 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 9, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:57:58,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:57:58,373 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:57:58,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:57:58,374 INFO L82 PathProgramCache]: Analyzing trace with hash -1126316255, now seen corresponding path program 12 times [2020-07-21 20:57:58,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:57:58,374 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [272183387] [2020-07-21 20:57:58,374 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:57:58,412 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:57:58,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:57:58,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 20:57:58,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:57:58,552 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 104 proven. 160 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2020-07-21 20:57:58,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:57:58,775 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 104 proven. 160 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2020-07-21 20:57:58,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [272183387] [2020-07-21 20:57:58,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:57:58,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 18 [2020-07-21 20:57:58,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769038965] [2020-07-21 20:57:58,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 20:57:58,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:57:58,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 20:57:58,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2020-07-21 20:57:58,778 INFO L87 Difference]: Start difference. First operand 302 states and 356 transitions. Second operand 18 states. [2020-07-21 20:58:00,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:58:00,215 INFO L93 Difference]: Finished difference Result 368 states and 440 transitions. [2020-07-21 20:58:00,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 20:58:00,221 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 109 [2020-07-21 20:58:00,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:58:00,223 INFO L225 Difference]: With dead ends: 368 [2020-07-21 20:58:00,224 INFO L226 Difference]: Without dead ends: 338 [2020-07-21 20:58:00,225 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 195 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=207, Invalid=663, Unknown=0, NotChecked=0, Total=870 [2020-07-21 20:58:00,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2020-07-21 20:58:00,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 338. [2020-07-21 20:58:00,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 338 states. [2020-07-21 20:58:00,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 404 transitions. [2020-07-21 20:58:00,276 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 404 transitions. Word has length 109 [2020-07-21 20:58:00,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:58:00,277 INFO L479 AbstractCegarLoop]: Abstraction has 338 states and 404 transitions. [2020-07-21 20:58:00,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 20:58:00,277 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 404 transitions. [2020-07-21 20:58:00,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 20:58:00,279 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:58:00,279 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 12, 10, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:58:00,493 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:58:00,494 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:58:00,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:58:00,494 INFO L82 PathProgramCache]: Analyzing trace with hash 1251867972, now seen corresponding path program 13 times [2020-07-21 20:58:00,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:58:00,495 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [100231742] [2020-07-21 20:58:00,495 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:58:00,550 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:58:00,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:58:00,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-21 20:58:00,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:58:02,103 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 20:58:02,691 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 20:58:03,323 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 20:58:04,002 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 20:58:04,724 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 20:58:05,783 WARN L193 SmtUtils]: Spent 265.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 20:58:06,848 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 24 proven. 288 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-21 20:58:06,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:58:07,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:58:33,668 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 24 proven. 288 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-21 20:58:33,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [100231742] [2020-07-21 20:58:33,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:58:33,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 30 [2020-07-21 20:58:33,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050253129] [2020-07-21 20:58:33,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 20:58:33,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:58:33,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 20:58:33,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=792, Unknown=0, NotChecked=0, Total=870 [2020-07-21 20:58:33,671 INFO L87 Difference]: Start difference. First operand 338 states and 404 transitions. Second operand 30 states. [2020-07-21 20:59:18,334 WARN L193 SmtUtils]: Spent 4.87 s on a formula simplification that was a NOOP. DAG size: 22 [2020-07-21 20:59:48,157 WARN L193 SmtUtils]: Spent 816.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-21 21:00:00,133 WARN L193 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 21:00:30,992 WARN L193 SmtUtils]: Spent 683.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 21:01:04,720 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 21:01:25,666 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 21:01:27,295 WARN L193 SmtUtils]: Spent 395.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 21:01:30,112 WARN L193 SmtUtils]: Spent 512.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 21:01:32,904 WARN L193 SmtUtils]: Spent 649.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-21 21:01:57,957 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 21:02:10,420 WARN L193 SmtUtils]: Spent 500.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-21 21:02:32,749 WARN L193 SmtUtils]: Spent 951.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-21 21:02:48,748 WARN L193 SmtUtils]: Spent 897.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 21:03:37,820 WARN L193 SmtUtils]: Spent 4.31 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-21 21:04:00,156 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* c_main_~y1~0 c_main_~x2~0))) (and (= (+ (* 2 c_main_~y2~0) (* 4 c_main_~y1~0) c_main_~y3~0 (* c_main_~y2~0 c_main_~y1~0)) (+ c_main_~x1~0 2)) (= (+ c_main_~x1~0 4) (+ c_main_~x2~0 c_main_~y3~0 .cse0)) (= (+ c_main_~y2~0 c_main_~y3~0 .cse0) c_main_~x1~0))) is different from false [2020-07-21 21:04:10,809 WARN L193 SmtUtils]: Spent 1.17 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 21:04:24,438 WARN L193 SmtUtils]: Spent 279.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-21 21:04:53,888 WARN L193 SmtUtils]: Spent 879.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 21:05:13,473 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 21:05:44,222 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 21:05:57,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:57,613 INFO L93 Difference]: Finished difference Result 512 states and 613 transitions. [2020-07-21 21:05:57,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 21:05:57,624 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 117 [2020-07-21 21:05:57,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:57,627 INFO L225 Difference]: With dead ends: 512 [2020-07-21 21:05:57,627 INFO L226 Difference]: Without dead ends: 470 [2020-07-21 21:05:57,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 203 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 258.2s TimeCoverageRelationStatistics Valid=201, Invalid=2531, Unknown=28, NotChecked=102, Total=2862 [2020-07-21 21:05:57,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2020-07-21 21:05:57,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 470. [2020-07-21 21:05:57,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 470 states. [2020-07-21 21:05:57,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 562 transitions. [2020-07-21 21:05:57,670 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 562 transitions. Word has length 117 [2020-07-21 21:05:57,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:57,670 INFO L479 AbstractCegarLoop]: Abstraction has 470 states and 562 transitions. [2020-07-21 21:05:57,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 21:05:57,670 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 562 transitions. [2020-07-21 21:05:57,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-21 21:05:57,672 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:57,672 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 10, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:05:57,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:57,887 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:57,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:57,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1353613609, now seen corresponding path program 14 times [2020-07-21 21:05:57,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:57,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1530754824] [2020-07-21 21:05:57,888 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:57,931 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:57,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:57,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 21:05:57,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:58,069 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 172 proven. 168 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-07-21 21:05:58,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 21:05:58,297 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 92 proven. 248 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-07-21 21:05:58,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1530754824] [2020-07-21 21:05:58,298 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 21:05:58,298 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-21 21:05:58,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682287011] [2020-07-21 21:05:58,299 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 21:05:58,299 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:58,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 21:05:58,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2020-07-21 21:05:58,300 INFO L87 Difference]: Start difference. First operand 470 states and 562 transitions. Second operand 17 states. [2020-07-21 21:05:59,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:59,511 INFO L93 Difference]: Finished difference Result 532 states and 639 transitions. [2020-07-21 21:05:59,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 21:05:59,525 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 125 [2020-07-21 21:05:59,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:59,528 INFO L225 Difference]: With dead ends: 532 [2020-07-21 21:05:59,528 INFO L226 Difference]: Without dead ends: 454 [2020-07-21 21:05:59,529 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 229 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=119, Invalid=301, Unknown=0, NotChecked=0, Total=420 [2020-07-21 21:05:59,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2020-07-21 21:05:59,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 452. [2020-07-21 21:05:59,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 452 states. [2020-07-21 21:05:59,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 533 transitions. [2020-07-21 21:05:59,563 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 533 transitions. Word has length 125 [2020-07-21 21:05:59,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:59,564 INFO L479 AbstractCegarLoop]: Abstraction has 452 states and 533 transitions. [2020-07-21 21:05:59,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 21:05:59,564 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 533 transitions. [2020-07-21 21:05:59,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-21 21:05:59,566 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:59,566 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 11, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:05:59,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:59,781 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:59,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:59,782 INFO L82 PathProgramCache]: Analyzing trace with hash -1050066329, now seen corresponding path program 15 times [2020-07-21 21:05:59,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:59,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1085069482] [2020-07-21 21:05:59,782 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:59,829 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:59,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:59,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 21:05:59,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:06:00,057 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 136 proven. 228 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2020-07-21 21:06:00,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 21:06:00,388 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 136 proven. 228 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2020-07-21 21:06:00,388 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1085069482] [2020-07-21 21:06:00,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 21:06:00,389 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 21 [2020-07-21 21:06:00,389 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718090565] [2020-07-21 21:06:00,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 21:06:00,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:06:00,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 21:06:00,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2020-07-21 21:06:00,390 INFO L87 Difference]: Start difference. First operand 452 states and 533 transitions. Second operand 21 states. [2020-07-21 21:06:06,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:06:06,577 INFO L93 Difference]: Finished difference Result 526 states and 627 transitions. [2020-07-21 21:06:06,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-21 21:06:06,593 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 125 [2020-07-21 21:06:06,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:06:06,596 INFO L225 Difference]: With dead ends: 526 [2020-07-21 21:06:06,596 INFO L226 Difference]: Without dead ends: 492 [2020-07-21 21:06:06,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 223 SyntacticMatches, 7 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=329, Invalid=1153, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 21:06:06,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2020-07-21 21:06:06,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 492. [2020-07-21 21:06:06,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 492 states. [2020-07-21 21:06:06,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 586 transitions. [2020-07-21 21:06:06,637 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 586 transitions. Word has length 125 [2020-07-21 21:06:06,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:06:06,638 INFO L479 AbstractCegarLoop]: Abstraction has 492 states and 586 transitions. [2020-07-21 21:06:06,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 21:06:06,638 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 586 transitions. [2020-07-21 21:06:06,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-21 21:06:06,639 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:06:06,640 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 14, 14, 14, 14, 12, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:06:06,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:06:06,854 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:06:06,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:06:06,855 INFO L82 PathProgramCache]: Analyzing trace with hash 3461770, now seen corresponding path program 16 times [2020-07-21 21:06:06,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:06:06,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [506237122] [2020-07-21 21:06:06,856 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:06:06,963 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 21:06:06,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:06:06,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 57 conjunts are in the unsatisfiable core [2020-07-21 21:06:06,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:06:07,247 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 21:06:07,543 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 21:06:07,895 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 21:06:08,295 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 21:06:08,769 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 21:06:09,345 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 21:06:10,387 WARN L193 SmtUtils]: Spent 339.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 21:06:11,594 WARN L193 SmtUtils]: Spent 343.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 21:06:12,850 WARN L193 SmtUtils]: Spent 335.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 21:06:14,220 WARN L193 SmtUtils]: Spent 329.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 21:06:15,514 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 21:06:17,014 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 21:06:18,985 WARN L193 SmtUtils]: Spent 471.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 21:06:21,109 INFO L134 CoverageAnalysis]: Checked inductivity of 788 backedges. 28 proven. 392 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 21:06:21,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 21:06:23,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 21:06:43,002 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2020-07-21 21:07:26,024 INFO L134 CoverageAnalysis]: Checked inductivity of 788 backedges. 28 proven. 392 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 21:07:26,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [506237122] [2020-07-21 21:07:26,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 21:07:26,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 34 [2020-07-21 21:07:26,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110697597] [2020-07-21 21:07:26,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 21:07:26,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:07:26,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 21:07:26,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1032, Unknown=1, NotChecked=0, Total=1122 [2020-07-21 21:07:26,027 INFO L87 Difference]: Start difference. First operand 492 states and 586 transitions. Second operand 34 states.