/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 BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_9.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 01:05:50,499 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 01:05:50,505 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 01:05:50,535 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 01:05:50,536 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 01:05:50,539 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 01:05:50,543 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 01:05:50,560 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 01:05:50,563 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 01:05:50,567 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 01:05:50,570 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 01:05:50,573 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 01:05:50,574 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 01:05:50,580 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 01:05:50,585 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 01:05:50,589 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 01:05:50,593 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 01:05:50,597 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 01:05:50,600 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 01:05:50,612 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 01:05:50,618 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 01:05:50,624 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 01:05:50,628 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 01:05:50,630 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 01:05:50,636 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 01:05:50,637 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 01:05:50,637 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 01:05:50,642 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 01:05:50,643 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 01:05:50,647 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 01:05:50,648 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 01:05:50,652 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 01:05:50,654 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 01:05:50,656 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 01:05:50,658 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 01:05:50,659 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 01:05:50,660 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 01:05:50,661 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 01:05:50,661 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 01:05:50,663 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 01:05:50,665 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 01:05:50,667 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 01:05:50,728 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 01:05:50,729 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 01:05:50,733 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 01:05:50,734 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 01:05:50,734 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 01:05:50,735 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 01:05:50,735 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 01:05:50,735 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 01:05:50,736 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 01:05:50,736 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 01:05:50,736 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 01:05:50,737 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 01:05:50,737 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 01:05:50,738 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 01:05:50,739 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 01:05:50,739 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 01:05:50,739 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 01:05:50,739 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 01:05:50,740 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 01:05:50,740 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 01:05:50,740 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 01:05:50,740 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:05:50,741 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 01:05:50,741 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 01:05:50,741 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 01:05:50,741 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 01:05:50,742 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:50,742 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 01:05:50,742 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 01:05:50,742 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 -> BIGGEST_EQUIVALENCE_CLASS 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 -> 4 [2020-07-21 01:05:51,219 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 01:05:51,244 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 01:05:51,252 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 01:05:51,254 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 01:05:51,255 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 01:05:51,256 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_9.c [2020-07-21 01:05:51,395 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/035fbd4c4/94b88e20fdb34b478f247de8b50c9e26/FLAG3994ecc9e [2020-07-21 01:05:52,130 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 01:05:52,131 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_9.c [2020-07-21 01:05:52,146 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/035fbd4c4/94b88e20fdb34b478f247de8b50c9e26/FLAG3994ecc9e [2020-07-21 01:05:52,523 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/035fbd4c4/94b88e20fdb34b478f247de8b50c9e26 [2020-07-21 01:05:52,538 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 01:05:52,543 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 01:05:52,545 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 01:05:52,546 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 01:05:52,552 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 01:05:52,553 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:05:52" (1/1) ... [2020-07-21 01:05:52,558 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28ed24b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:52, skipping insertion in model container [2020-07-21 01:05:52,559 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:05:52" (1/1) ... [2020-07-21 01:05:52,573 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 01:05:52,624 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 01:05:53,007 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:05:53,023 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 01:05:53,117 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:05:53,141 INFO L208 MainTranslator]: Completed translation [2020-07-21 01:05:53,141 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:53 WrapperNode [2020-07-21 01:05:53,142 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 01:05:53,143 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 01:05:53,143 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 01:05:53,143 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 01:05:53,285 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:53" (1/1) ... [2020-07-21 01:05:53,286 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:53" (1/1) ... [2020-07-21 01:05:53,298 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:53" (1/1) ... [2020-07-21 01:05:53,299 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:53" (1/1) ... [2020-07-21 01:05:53,319 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:53" (1/1) ... [2020-07-21 01:05:53,350 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:53" (1/1) ... [2020-07-21 01:05:53,353 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:53" (1/1) ... [2020-07-21 01:05:53,364 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 01:05:53,365 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 01:05:53,365 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 01:05:53,366 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 01:05:53,369 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:53" (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 01:05:53,461 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 01:05:53,461 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 01:05:53,462 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 01:05:53,462 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 01:05:53,462 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 01:05:53,463 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 01:05:53,463 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 01:05:53,463 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 01:05:53,938 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 01:05:53,939 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 01:05:53,949 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:05:53 BoogieIcfgContainer [2020-07-21 01:05:53,950 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 01:05:53,953 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 01:05:53,954 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 01:05:53,961 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 01:05:53,962 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:05:52" (1/3) ... [2020-07-21 01:05:53,965 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d27930e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:05:53, skipping insertion in model container [2020-07-21 01:05:53,965 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:53" (2/3) ... [2020-07-21 01:05:53,966 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d27930e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:05:53, skipping insertion in model container [2020-07-21 01:05:53,968 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:05:53" (3/3) ... [2020-07-21 01:05:53,972 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_9.c [2020-07-21 01:05:53,994 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 01:05:54,010 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 01:05:54,074 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 01:05:54,133 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 01:05:54,133 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 01:05:54,134 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 01:05:54,134 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 01:05:54,134 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 01:05:54,134 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 01:05:54,135 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 01:05:54,135 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 01:05:54,165 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2020-07-21 01:05:54,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 01:05:54,175 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:54,177 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:54,177 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:54,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:54,186 INFO L82 PathProgramCache]: Analyzing trace with hash 691982780, now seen corresponding path program 1 times [2020-07-21 01:05:54,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:54,196 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1821266238] [2020-07-21 01:05:54,196 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:05:54,342 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:54,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:54,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:54,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:54,431 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:54,432 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:54,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1821266238] [2020-07-21 01:05:54,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:54,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:54,436 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739359068] [2020-07-21 01:05:54,444 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:54,444 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:54,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:54,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:54,464 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 3 states. [2020-07-21 01:05:54,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:54,569 INFO L93 Difference]: Finished difference Result 81 states and 138 transitions. [2020-07-21 01:05:54,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:54,573 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 01:05:54,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:54,595 INFO L225 Difference]: With dead ends: 81 [2020-07-21 01:05:54,595 INFO L226 Difference]: Without dead ends: 66 [2020-07-21 01:05:54,602 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:54,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-21 01:05:54,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-07-21 01:05:54,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 01:05:54,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 81 transitions. [2020-07-21 01:05:54,670 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 81 transitions. Word has length 19 [2020-07-21 01:05:54,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:54,671 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 81 transitions. [2020-07-21 01:05:54,671 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:54,672 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 81 transitions. [2020-07-21 01:05:54,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 01:05:54,674 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:54,674 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:54,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:54,884 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:54,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:54,885 INFO L82 PathProgramCache]: Analyzing trace with hash 950148218, now seen corresponding path program 1 times [2020-07-21 01:05:54,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:54,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1719971558] [2020-07-21 01:05:54,887 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:05:54,967 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:54,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:54,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:54,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:54,988 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:54,989 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:54,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1719971558] [2020-07-21 01:05:54,990 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:54,991 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:54,991 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116590450] [2020-07-21 01:05:54,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:54,995 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:54,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:54,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:54,997 INFO L87 Difference]: Start difference. First operand 46 states and 81 transitions. Second operand 3 states. [2020-07-21 01:05:55,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:55,044 INFO L93 Difference]: Finished difference Result 107 states and 192 transitions. [2020-07-21 01:05:55,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:55,045 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 01:05:55,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:55,048 INFO L225 Difference]: With dead ends: 107 [2020-07-21 01:05:55,048 INFO L226 Difference]: Without dead ends: 66 [2020-07-21 01:05:55,051 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-21 01:05:55,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2020-07-21 01:05:55,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 01:05:55,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 113 transitions. [2020-07-21 01:05:55,066 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 113 transitions. Word has length 19 [2020-07-21 01:05:55,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:55,067 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 113 transitions. [2020-07-21 01:05:55,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:55,067 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 113 transitions. [2020-07-21 01:05:55,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 01:05:55,069 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:55,069 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:55,284 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:55,285 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:55,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:55,287 INFO L82 PathProgramCache]: Analyzing trace with hash -23156596, now seen corresponding path program 1 times [2020-07-21 01:05:55,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:55,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1343362899] [2020-07-21 01:05:55,288 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:05:55,386 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:55,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:55,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:55,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:55,413 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:55,413 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:55,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1343362899] [2020-07-21 01:05:55,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:55,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:55,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778048070] [2020-07-21 01:05:55,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:55,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:55,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:55,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,417 INFO L87 Difference]: Start difference. First operand 64 states and 113 transitions. Second operand 3 states. [2020-07-21 01:05:55,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:55,451 INFO L93 Difference]: Finished difference Result 99 states and 171 transitions. [2020-07-21 01:05:55,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:55,452 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 01:05:55,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:55,455 INFO L225 Difference]: With dead ends: 99 [2020-07-21 01:05:55,455 INFO L226 Difference]: Without dead ends: 69 [2020-07-21 01:05:55,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-07-21 01:05:55,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2020-07-21 01:05:55,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-07-21 01:05:55,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 115 transitions. [2020-07-21 01:05:55,470 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 115 transitions. Word has length 20 [2020-07-21 01:05:55,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:55,471 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 115 transitions. [2020-07-21 01:05:55,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:55,472 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 115 transitions. [2020-07-21 01:05:55,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 01:05:55,473 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:55,473 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:55,688 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:55,689 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:55,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:55,690 INFO L82 PathProgramCache]: Analyzing trace with hash -609962610, now seen corresponding path program 1 times [2020-07-21 01:05:55,691 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:55,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1549065200] [2020-07-21 01:05:55,692 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:05:55,758 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:55,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:55,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:55,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:55,776 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:55,776 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:55,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1549065200] [2020-07-21 01:05:55,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:55,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:55,779 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296580987] [2020-07-21 01:05:55,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:55,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:55,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:55,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,781 INFO L87 Difference]: Start difference. First operand 67 states and 115 transitions. Second operand 3 states. [2020-07-21 01:05:55,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:55,820 INFO L93 Difference]: Finished difference Result 124 states and 216 transitions. [2020-07-21 01:05:55,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:55,822 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 01:05:55,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:55,824 INFO L225 Difference]: With dead ends: 124 [2020-07-21 01:05:55,824 INFO L226 Difference]: Without dead ends: 122 [2020-07-21 01:05:55,825 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-21 01:05:55,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 88. [2020-07-21 01:05:55,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-07-21 01:05:55,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 152 transitions. [2020-07-21 01:05:55,843 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 152 transitions. Word has length 20 [2020-07-21 01:05:55,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:55,844 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 152 transitions. [2020-07-21 01:05:55,844 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:55,844 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 152 transitions. [2020-07-21 01:05:55,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 01:05:55,846 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:55,847 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:56,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:56,063 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:56,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:56,064 INFO L82 PathProgramCache]: Analyzing trace with hash -351797172, now seen corresponding path program 1 times [2020-07-21 01:05:56,065 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:56,066 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [348023565] [2020-07-21 01:05:56,066 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:05:56,149 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:56,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:56,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:56,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:56,170 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:56,171 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:56,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [348023565] [2020-07-21 01:05:56,172 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:56,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:56,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305442551] [2020-07-21 01:05:56,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:56,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:56,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:56,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:56,179 INFO L87 Difference]: Start difference. First operand 88 states and 152 transitions. Second operand 3 states. [2020-07-21 01:05:56,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:56,232 INFO L93 Difference]: Finished difference Result 204 states and 358 transitions. [2020-07-21 01:05:56,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:56,233 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 01:05:56,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:56,235 INFO L225 Difference]: With dead ends: 204 [2020-07-21 01:05:56,236 INFO L226 Difference]: Without dead ends: 124 [2020-07-21 01:05:56,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:56,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-21 01:05:56,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2020-07-21 01:05:56,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2020-07-21 01:05:56,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 210 transitions. [2020-07-21 01:05:56,263 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 210 transitions. Word has length 20 [2020-07-21 01:05:56,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:56,263 INFO L479 AbstractCegarLoop]: Abstraction has 122 states and 210 transitions. [2020-07-21 01:05:56,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:56,264 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 210 transitions. [2020-07-21 01:05:56,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 01:05:56,265 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:56,266 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:56,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:56,477 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:56,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:56,479 INFO L82 PathProgramCache]: Analyzing trace with hash -1728757681, now seen corresponding path program 1 times [2020-07-21 01:05:56,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:56,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [732970951] [2020-07-21 01:05:56,480 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:05:56,533 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:05:56,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:56,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:56,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:56,547 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:56,548 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:56,549 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [732970951] [2020-07-21 01:05:56,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:56,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:56,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646117545] [2020-07-21 01:05:56,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:56,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:56,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:56,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:56,552 INFO L87 Difference]: Start difference. First operand 122 states and 210 transitions. Second operand 3 states. [2020-07-21 01:05:56,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:56,594 INFO L93 Difference]: Finished difference Result 183 states and 313 transitions. [2020-07-21 01:05:56,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:56,595 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 01:05:56,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:56,597 INFO L225 Difference]: With dead ends: 183 [2020-07-21 01:05:56,598 INFO L226 Difference]: Without dead ends: 126 [2020-07-21 01:05:56,599 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:56,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-07-21 01:05:56,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 124. [2020-07-21 01:05:56,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-21 01:05:56,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 210 transitions. [2020-07-21 01:05:56,615 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 210 transitions. Word has length 21 [2020-07-21 01:05:56,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:56,616 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 210 transitions. [2020-07-21 01:05:56,616 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:56,616 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 210 transitions. [2020-07-21 01:05:56,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 01:05:56,618 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:56,618 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:56,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:56,833 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:56,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:56,834 INFO L82 PathProgramCache]: Analyzing trace with hash 1979403601, now seen corresponding path program 1 times [2020-07-21 01:05:56,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:56,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1528059520] [2020-07-21 01:05:56,835 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:05:56,887 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:56,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:56,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:56,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:56,910 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:56,911 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:56,912 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1528059520] [2020-07-21 01:05:56,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:56,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:56,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615519521] [2020-07-21 01:05:56,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:56,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:56,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:56,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:56,915 INFO L87 Difference]: Start difference. First operand 124 states and 210 transitions. Second operand 3 states. [2020-07-21 01:05:56,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:56,962 INFO L93 Difference]: Finished difference Result 228 states and 392 transitions. [2020-07-21 01:05:56,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:56,964 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 01:05:56,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:56,966 INFO L225 Difference]: With dead ends: 228 [2020-07-21 01:05:56,966 INFO L226 Difference]: Without dead ends: 226 [2020-07-21 01:05:56,969 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:56,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-21 01:05:57,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 168. [2020-07-21 01:05:57,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2020-07-21 01:05:57,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 282 transitions. [2020-07-21 01:05:57,015 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 282 transitions. Word has length 21 [2020-07-21 01:05:57,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:57,016 INFO L479 AbstractCegarLoop]: Abstraction has 168 states and 282 transitions. [2020-07-21 01:05:57,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:57,016 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 282 transitions. [2020-07-21 01:05:57,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 01:05:57,021 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:57,026 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:57,238 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:57,239 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:57,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:57,240 INFO L82 PathProgramCache]: Analyzing trace with hash -2057398257, now seen corresponding path program 1 times [2020-07-21 01:05:57,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:57,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [381173886] [2020-07-21 01:05:57,241 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:05:57,294 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:57,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:57,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:57,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:57,327 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:57,328 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:57,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [381173886] [2020-07-21 01:05:57,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:57,330 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:57,330 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111071477] [2020-07-21 01:05:57,331 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:57,331 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:57,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:57,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:57,332 INFO L87 Difference]: Start difference. First operand 168 states and 282 transitions. Second operand 3 states. [2020-07-21 01:05:57,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:57,377 INFO L93 Difference]: Finished difference Result 392 states and 664 transitions. [2020-07-21 01:05:57,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:57,378 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 01:05:57,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:57,380 INFO L225 Difference]: With dead ends: 392 [2020-07-21 01:05:57,382 INFO L226 Difference]: Without dead ends: 234 [2020-07-21 01:05:57,386 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:57,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-21 01:05:57,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 232. [2020-07-21 01:05:57,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2020-07-21 01:05:57,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 386 transitions. [2020-07-21 01:05:57,402 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 386 transitions. Word has length 21 [2020-07-21 01:05:57,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:57,402 INFO L479 AbstractCegarLoop]: Abstraction has 232 states and 386 transitions. [2020-07-21 01:05:57,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:57,403 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 386 transitions. [2020-07-21 01:05:57,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 01:05:57,405 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:57,406 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:57,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:57,620 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:57,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:57,621 INFO L82 PathProgramCache]: Analyzing trace with hash 1232183873, now seen corresponding path program 1 times [2020-07-21 01:05:57,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:57,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1758932596] [2020-07-21 01:05:57,623 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:05:57,688 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:57,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:57,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:57,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:57,723 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:57,723 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:57,726 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1758932596] [2020-07-21 01:05:57,726 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:57,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:57,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407048100] [2020-07-21 01:05:57,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:57,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:57,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:57,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:57,729 INFO L87 Difference]: Start difference. First operand 232 states and 386 transitions. Second operand 3 states. [2020-07-21 01:05:57,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:57,790 INFO L93 Difference]: Finished difference Result 348 states and 576 transitions. [2020-07-21 01:05:57,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:57,791 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 01:05:57,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:57,797 INFO L225 Difference]: With dead ends: 348 [2020-07-21 01:05:57,798 INFO L226 Difference]: Without dead ends: 238 [2020-07-21 01:05:57,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:57,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2020-07-21 01:05:57,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 236. [2020-07-21 01:05:57,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-21 01:05:57,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 386 transitions. [2020-07-21 01:05:57,837 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 386 transitions. Word has length 22 [2020-07-21 01:05:57,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:57,838 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 386 transitions. [2020-07-21 01:05:57,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:57,838 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 386 transitions. [2020-07-21 01:05:57,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 01:05:57,850 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:57,851 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:58,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:58,066 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:58,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:58,066 INFO L82 PathProgramCache]: Analyzing trace with hash 645377859, now seen corresponding path program 1 times [2020-07-21 01:05:58,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:58,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [142931844] [2020-07-21 01:05:58,067 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:05:58,148 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:58,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:58,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:58,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:58,177 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:58,178 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:58,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [142931844] [2020-07-21 01:05:58,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:58,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:58,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650075027] [2020-07-21 01:05:58,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:58,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:58,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:58,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:58,184 INFO L87 Difference]: Start difference. First operand 236 states and 386 transitions. Second operand 3 states. [2020-07-21 01:05:58,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:58,227 INFO L93 Difference]: Finished difference Result 428 states and 712 transitions. [2020-07-21 01:05:58,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:58,227 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 01:05:58,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:58,231 INFO L225 Difference]: With dead ends: 428 [2020-07-21 01:05:58,231 INFO L226 Difference]: Without dead ends: 426 [2020-07-21 01:05:58,233 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:58,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2020-07-21 01:05:58,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 328. [2020-07-21 01:05:58,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 328 states. [2020-07-21 01:05:58,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 526 transitions. [2020-07-21 01:05:58,251 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 526 transitions. Word has length 22 [2020-07-21 01:05:58,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:58,251 INFO L479 AbstractCegarLoop]: Abstraction has 328 states and 526 transitions. [2020-07-21 01:05:58,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:58,252 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 526 transitions. [2020-07-21 01:05:58,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 01:05:58,253 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:58,253 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:58,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:58,469 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:58,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:58,470 INFO L82 PathProgramCache]: Analyzing trace with hash 903543297, now seen corresponding path program 1 times [2020-07-21 01:05:58,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:58,471 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [820207460] [2020-07-21 01:05:58,471 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:05:58,519 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:58,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:58,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:58,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:58,573 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:58,576 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:58,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [820207460] [2020-07-21 01:05:58,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:58,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:58,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77177279] [2020-07-21 01:05:58,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:58,578 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:58,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:58,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:58,580 INFO L87 Difference]: Start difference. First operand 328 states and 526 transitions. Second operand 3 states. [2020-07-21 01:05:58,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:58,646 INFO L93 Difference]: Finished difference Result 764 states and 1232 transitions. [2020-07-21 01:05:58,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:58,647 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 01:05:58,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:58,652 INFO L225 Difference]: With dead ends: 764 [2020-07-21 01:05:58,654 INFO L226 Difference]: Without dead ends: 450 [2020-07-21 01:05:58,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:58,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2020-07-21 01:05:58,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 448. [2020-07-21 01:05:58,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 448 states. [2020-07-21 01:05:58,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 710 transitions. [2020-07-21 01:05:58,697 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 710 transitions. Word has length 22 [2020-07-21 01:05:58,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:58,698 INFO L479 AbstractCegarLoop]: Abstraction has 448 states and 710 transitions. [2020-07-21 01:05:58,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:58,698 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 710 transitions. [2020-07-21 01:05:58,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 01:05:58,700 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:58,700 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:58,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:58,916 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:58,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:58,917 INFO L82 PathProgramCache]: Analyzing trace with hash -1467908124, now seen corresponding path program 1 times [2020-07-21 01:05:58,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:58,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [582157638] [2020-07-21 01:05:58,918 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:05:58,962 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:58,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:58,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:58,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:58,983 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:58,983 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:58,984 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [582157638] [2020-07-21 01:05:58,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:58,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:58,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824906733] [2020-07-21 01:05:58,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:58,987 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:58,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:58,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:58,988 INFO L87 Difference]: Start difference. First operand 448 states and 710 transitions. Second operand 3 states. [2020-07-21 01:05:59,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:59,023 INFO L93 Difference]: Finished difference Result 672 states and 1060 transitions. [2020-07-21 01:05:59,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:59,024 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 01:05:59,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:59,028 INFO L225 Difference]: With dead ends: 672 [2020-07-21 01:05:59,028 INFO L226 Difference]: Without dead ends: 458 [2020-07-21 01:05:59,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:59,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2020-07-21 01:05:59,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 456. [2020-07-21 01:05:59,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 456 states. [2020-07-21 01:05:59,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 710 transitions. [2020-07-21 01:05:59,076 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 710 transitions. Word has length 23 [2020-07-21 01:05:59,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:59,077 INFO L479 AbstractCegarLoop]: Abstraction has 456 states and 710 transitions. [2020-07-21 01:05:59,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:59,077 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 710 transitions. [2020-07-21 01:05:59,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 01:05:59,085 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:59,087 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:59,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:59,300 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:59,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:59,300 INFO L82 PathProgramCache]: Analyzing trace with hash -2054714138, now seen corresponding path program 1 times [2020-07-21 01:05:59,301 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:59,301 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1122678448] [2020-07-21 01:05:59,302 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:05:59,348 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:59,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:59,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:59,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:59,368 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:59,368 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:59,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1122678448] [2020-07-21 01:05:59,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:59,371 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:59,371 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896666033] [2020-07-21 01:05:59,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:59,372 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:59,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:59,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:59,377 INFO L87 Difference]: Start difference. First operand 456 states and 710 transitions. Second operand 3 states. [2020-07-21 01:05:59,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:59,417 INFO L93 Difference]: Finished difference Result 812 states and 1288 transitions. [2020-07-21 01:05:59,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:59,419 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 01:05:59,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:59,426 INFO L225 Difference]: With dead ends: 812 [2020-07-21 01:05:59,427 INFO L226 Difference]: Without dead ends: 810 [2020-07-21 01:05:59,429 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:59,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 810 states. [2020-07-21 01:05:59,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 810 to 648. [2020-07-21 01:05:59,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 648 states. [2020-07-21 01:05:59,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 648 states to 648 states and 982 transitions. [2020-07-21 01:05:59,458 INFO L78 Accepts]: Start accepts. Automaton has 648 states and 982 transitions. Word has length 23 [2020-07-21 01:05:59,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:59,459 INFO L479 AbstractCegarLoop]: Abstraction has 648 states and 982 transitions. [2020-07-21 01:05:59,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:59,459 INFO L276 IsEmpty]: Start isEmpty. Operand 648 states and 982 transitions. [2020-07-21 01:05:59,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 01:05:59,461 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:59,462 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:59,676 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:59,677 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:59,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:59,678 INFO L82 PathProgramCache]: Analyzing trace with hash -1796548700, now seen corresponding path program 1 times [2020-07-21 01:05:59,679 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:59,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [926368298] [2020-07-21 01:05:59,681 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:05:59,749 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:59,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:59,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:59,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:59,768 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:59,768 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:59,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [926368298] [2020-07-21 01:05:59,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:59,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:59,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641730449] [2020-07-21 01:05:59,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:59,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:59,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:59,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:59,773 INFO L87 Difference]: Start difference. First operand 648 states and 982 transitions. Second operand 3 states. [2020-07-21 01:05:59,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:59,825 INFO L93 Difference]: Finished difference Result 1500 states and 2280 transitions. [2020-07-21 01:05:59,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:59,827 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 01:05:59,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:59,835 INFO L225 Difference]: With dead ends: 1500 [2020-07-21 01:05:59,836 INFO L226 Difference]: Without dead ends: 874 [2020-07-21 01:05:59,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:59,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 874 states. [2020-07-21 01:05:59,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 874 to 872. [2020-07-21 01:05:59,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 872 states. [2020-07-21 01:05:59,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 872 states to 872 states and 1302 transitions. [2020-07-21 01:05:59,901 INFO L78 Accepts]: Start accepts. Automaton has 872 states and 1302 transitions. Word has length 23 [2020-07-21 01:05:59,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:59,901 INFO L479 AbstractCegarLoop]: Abstraction has 872 states and 1302 transitions. [2020-07-21 01:05:59,902 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:59,902 INFO L276 IsEmpty]: Start isEmpty. Operand 872 states and 1302 transitions. [2020-07-21 01:05:59,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 01:05:59,905 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:59,906 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:06:00,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:00,121 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:06:00,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:06:00,123 INFO L82 PathProgramCache]: Analyzing trace with hash 728586230, now seen corresponding path program 1 times [2020-07-21 01:06:00,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:06:00,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [134116070] [2020-07-21 01:06:00,124 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:06:00,197 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:06:00,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:06:00,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:06:00,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:06:00,221 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:06:00,222 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:06:00,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [134116070] [2020-07-21 01:06:00,228 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:06:00,228 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:06:00,229 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223531011] [2020-07-21 01:06:00,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:06:00,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:06:00,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:06:00,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:00,232 INFO L87 Difference]: Start difference. First operand 872 states and 1302 transitions. Second operand 3 states. [2020-07-21 01:06:00,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:06:00,275 INFO L93 Difference]: Finished difference Result 1308 states and 1944 transitions. [2020-07-21 01:06:00,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:06:00,276 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 01:06:00,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:06:00,284 INFO L225 Difference]: With dead ends: 1308 [2020-07-21 01:06:00,284 INFO L226 Difference]: Without dead ends: 890 [2020-07-21 01:06:00,289 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:00,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 890 states. [2020-07-21 01:06:00,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 890 to 888. [2020-07-21 01:06:00,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 888 states. [2020-07-21 01:06:00,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 888 states to 888 states and 1302 transitions. [2020-07-21 01:06:00,341 INFO L78 Accepts]: Start accepts. Automaton has 888 states and 1302 transitions. Word has length 24 [2020-07-21 01:06:00,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:06:00,341 INFO L479 AbstractCegarLoop]: Abstraction has 888 states and 1302 transitions. [2020-07-21 01:06:00,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:06:00,343 INFO L276 IsEmpty]: Start isEmpty. Operand 888 states and 1302 transitions. [2020-07-21 01:06:00,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 01:06:00,347 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:06:00,347 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:06:00,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:00,563 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:06:00,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:06:00,564 INFO L82 PathProgramCache]: Analyzing trace with hash 141780216, now seen corresponding path program 1 times [2020-07-21 01:06:00,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:06:00,565 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1029368881] [2020-07-21 01:06:00,565 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:06:00,624 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:06:00,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:06:00,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:06:00,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:06:00,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:06:00,647 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:06:00,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1029368881] [2020-07-21 01:06:00,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:06:00,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:06:00,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557451540] [2020-07-21 01:06:00,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:06:00,654 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:06:00,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:06:00,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:00,655 INFO L87 Difference]: Start difference. First operand 888 states and 1302 transitions. Second operand 3 states. [2020-07-21 01:06:00,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:06:00,714 INFO L93 Difference]: Finished difference Result 1548 states and 2312 transitions. [2020-07-21 01:06:00,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:06:00,715 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 01:06:00,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:06:00,727 INFO L225 Difference]: With dead ends: 1548 [2020-07-21 01:06:00,728 INFO L226 Difference]: Without dead ends: 1546 [2020-07-21 01:06:00,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:00,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1546 states. [2020-07-21 01:06:00,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1546 to 1288. [2020-07-21 01:06:00,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1288 states. [2020-07-21 01:06:00,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1288 states to 1288 states and 1830 transitions. [2020-07-21 01:06:00,811 INFO L78 Accepts]: Start accepts. Automaton has 1288 states and 1830 transitions. Word has length 24 [2020-07-21 01:06:00,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:06:00,814 INFO L479 AbstractCegarLoop]: Abstraction has 1288 states and 1830 transitions. [2020-07-21 01:06:00,814 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:06:00,814 INFO L276 IsEmpty]: Start isEmpty. Operand 1288 states and 1830 transitions. [2020-07-21 01:06:00,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 01:06:00,819 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:06:00,819 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:06:01,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:01,033 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:06:01,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:06:01,034 INFO L82 PathProgramCache]: Analyzing trace with hash 399945654, now seen corresponding path program 1 times [2020-07-21 01:06:01,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:06:01,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1297675845] [2020-07-21 01:06:01,035 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:06:01,108 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:06:01,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:06:01,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:06:01,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:06:01,121 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:06:01,122 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:06:01,122 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1297675845] [2020-07-21 01:06:01,122 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:06:01,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:06:01,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846092232] [2020-07-21 01:06:01,128 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:06:01,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:06:01,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:06:01,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:01,130 INFO L87 Difference]: Start difference. First operand 1288 states and 1830 transitions. Second operand 3 states. [2020-07-21 01:06:01,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:06:01,190 INFO L93 Difference]: Finished difference Result 2956 states and 4200 transitions. [2020-07-21 01:06:01,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:06:01,190 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 01:06:01,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:06:01,203 INFO L225 Difference]: With dead ends: 2956 [2020-07-21 01:06:01,204 INFO L226 Difference]: Without dead ends: 1706 [2020-07-21 01:06:01,209 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:01,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1706 states. [2020-07-21 01:06:01,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1706 to 1704. [2020-07-21 01:06:01,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1704 states. [2020-07-21 01:06:01,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1704 states to 1704 states and 2374 transitions. [2020-07-21 01:06:01,319 INFO L78 Accepts]: Start accepts. Automaton has 1704 states and 2374 transitions. Word has length 24 [2020-07-21 01:06:01,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:06:01,319 INFO L479 AbstractCegarLoop]: Abstraction has 1704 states and 2374 transitions. [2020-07-21 01:06:01,319 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:06:01,320 INFO L276 IsEmpty]: Start isEmpty. Operand 1704 states and 2374 transitions. [2020-07-21 01:06:01,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 01:06:01,327 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:06:01,327 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:06:01,541 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:01,542 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:06:01,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:06:01,543 INFO L82 PathProgramCache]: Analyzing trace with hash 100434809, now seen corresponding path program 1 times [2020-07-21 01:06:01,543 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:06:01,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2007704474] [2020-07-21 01:06:01,544 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:06:01,584 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:06:01,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:06:01,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:06:01,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:06:01,595 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:06:01,596 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:06:01,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2007704474] [2020-07-21 01:06:01,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:06:01,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:06:01,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262118967] [2020-07-21 01:06:01,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:06:01,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:06:01,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:06:01,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:01,599 INFO L87 Difference]: Start difference. First operand 1704 states and 2374 transitions. Second operand 3 states. [2020-07-21 01:06:01,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:06:01,663 INFO L93 Difference]: Finished difference Result 2556 states and 3544 transitions. [2020-07-21 01:06:01,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:06:01,664 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 01:06:01,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:06:01,677 INFO L225 Difference]: With dead ends: 2556 [2020-07-21 01:06:01,677 INFO L226 Difference]: Without dead ends: 1738 [2020-07-21 01:06:01,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:01,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1738 states. [2020-07-21 01:06:01,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1738 to 1736. [2020-07-21 01:06:01,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1736 states. [2020-07-21 01:06:01,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1736 states to 1736 states and 2374 transitions. [2020-07-21 01:06:01,765 INFO L78 Accepts]: Start accepts. Automaton has 1736 states and 2374 transitions. Word has length 25 [2020-07-21 01:06:01,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:06:01,766 INFO L479 AbstractCegarLoop]: Abstraction has 1736 states and 2374 transitions. [2020-07-21 01:06:01,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:06:01,766 INFO L276 IsEmpty]: Start isEmpty. Operand 1736 states and 2374 transitions. [2020-07-21 01:06:01,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 01:06:01,770 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:06:01,770 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:06:01,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:01,985 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:06:01,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:06:01,986 INFO L82 PathProgramCache]: Analyzing trace with hash -486371205, now seen corresponding path program 1 times [2020-07-21 01:06:01,986 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:06:01,986 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1846276249] [2020-07-21 01:06:01,987 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:06:02,030 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:06:02,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:06:02,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:06:02,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:06:02,054 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:06:02,054 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:06:02,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1846276249] [2020-07-21 01:06:02,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:06:02,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:06:02,055 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863274171] [2020-07-21 01:06:02,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:06:02,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:06:02,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:06:02,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:02,061 INFO L87 Difference]: Start difference. First operand 1736 states and 2374 transitions. Second operand 3 states. [2020-07-21 01:06:02,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:06:02,142 INFO L93 Difference]: Finished difference Result 2956 states and 4104 transitions. [2020-07-21 01:06:02,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:06:02,143 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 01:06:02,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:06:02,164 INFO L225 Difference]: With dead ends: 2956 [2020-07-21 01:06:02,165 INFO L226 Difference]: Without dead ends: 2954 [2020-07-21 01:06:02,171 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:02,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2954 states. [2020-07-21 01:06:02,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2954 to 2568. [2020-07-21 01:06:02,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2568 states. [2020-07-21 01:06:02,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2568 states to 2568 states and 3398 transitions. [2020-07-21 01:06:02,318 INFO L78 Accepts]: Start accepts. Automaton has 2568 states and 3398 transitions. Word has length 25 [2020-07-21 01:06:02,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:06:02,318 INFO L479 AbstractCegarLoop]: Abstraction has 2568 states and 3398 transitions. [2020-07-21 01:06:02,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:06:02,319 INFO L276 IsEmpty]: Start isEmpty. Operand 2568 states and 3398 transitions. [2020-07-21 01:06:02,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 01:06:02,326 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:06:02,326 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:06:02,540 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:02,541 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:06:02,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:06:02,542 INFO L82 PathProgramCache]: Analyzing trace with hash -228205767, now seen corresponding path program 1 times [2020-07-21 01:06:02,542 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:06:02,542 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1154344251] [2020-07-21 01:06:02,542 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:06:02,606 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:06:02,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:06:02,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:06:02,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:06:02,626 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:06:02,627 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:06:02,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1154344251] [2020-07-21 01:06:02,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:06:02,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:06:02,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702808978] [2020-07-21 01:06:02,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:06:02,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:06:02,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:06:02,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:02,632 INFO L87 Difference]: Start difference. First operand 2568 states and 3398 transitions. Second operand 3 states. [2020-07-21 01:06:02,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:06:02,752 INFO L93 Difference]: Finished difference Result 5836 states and 7688 transitions. [2020-07-21 01:06:02,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:06:02,753 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 01:06:02,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:06:02,773 INFO L225 Difference]: With dead ends: 5836 [2020-07-21 01:06:02,773 INFO L226 Difference]: Without dead ends: 3338 [2020-07-21 01:06:02,780 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:02,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3338 states. [2020-07-21 01:06:02,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3338 to 3336. [2020-07-21 01:06:02,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3336 states. [2020-07-21 01:06:02,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3336 states to 3336 states and 4294 transitions. [2020-07-21 01:06:02,916 INFO L78 Accepts]: Start accepts. Automaton has 3336 states and 4294 transitions. Word has length 25 [2020-07-21 01:06:02,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:06:02,916 INFO L479 AbstractCegarLoop]: Abstraction has 3336 states and 4294 transitions. [2020-07-21 01:06:02,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:06:02,917 INFO L276 IsEmpty]: Start isEmpty. Operand 3336 states and 4294 transitions. [2020-07-21 01:06:02,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 01:06:02,924 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:06:02,924 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:06:03,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:03,142 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:06:03,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:06:03,143 INFO L82 PathProgramCache]: Analyzing trace with hash 2102577579, now seen corresponding path program 1 times [2020-07-21 01:06:03,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:06:03,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1189535966] [2020-07-21 01:06:03,144 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:06:03,195 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:06:03,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:06:03,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:06:03,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:06:03,210 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:06:03,210 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:06:03,211 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1189535966] [2020-07-21 01:06:03,211 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:06:03,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:06:03,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212246249] [2020-07-21 01:06:03,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:06:03,212 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:06:03,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:06:03,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:03,213 INFO L87 Difference]: Start difference. First operand 3336 states and 4294 transitions. Second operand 3 states. [2020-07-21 01:06:03,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:06:03,290 INFO L93 Difference]: Finished difference Result 5004 states and 6408 transitions. [2020-07-21 01:06:03,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:06:03,293 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 01:06:03,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:06:03,314 INFO L225 Difference]: With dead ends: 5004 [2020-07-21 01:06:03,315 INFO L226 Difference]: Without dead ends: 3402 [2020-07-21 01:06:03,322 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:03,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3402 states. [2020-07-21 01:06:03,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3402 to 3400. [2020-07-21 01:06:03,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3400 states. [2020-07-21 01:06:03,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3400 states to 3400 states and 4294 transitions. [2020-07-21 01:06:03,466 INFO L78 Accepts]: Start accepts. Automaton has 3400 states and 4294 transitions. Word has length 26 [2020-07-21 01:06:03,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:06:03,466 INFO L479 AbstractCegarLoop]: Abstraction has 3400 states and 4294 transitions. [2020-07-21 01:06:03,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:06:03,466 INFO L276 IsEmpty]: Start isEmpty. Operand 3400 states and 4294 transitions. [2020-07-21 01:06:03,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 01:06:03,472 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:06:03,473 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:06:03,688 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:03,689 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:06:03,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:06:03,689 INFO L82 PathProgramCache]: Analyzing trace with hash 1515771565, now seen corresponding path program 1 times [2020-07-21 01:06:03,689 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:06:03,690 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1028849068] [2020-07-21 01:06:03,690 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:03,729 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:06:03,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:06:03,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:06:03,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:06:03,741 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:06:03,742 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:06:03,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1028849068] [2020-07-21 01:06:03,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:06:03,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:06:03,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850912729] [2020-07-21 01:06:03,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:06:03,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:06:03,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:06:03,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:03,745 INFO L87 Difference]: Start difference. First operand 3400 states and 4294 transitions. Second operand 3 states. [2020-07-21 01:06:03,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:06:03,879 INFO L93 Difference]: Finished difference Result 9804 states and 12104 transitions. [2020-07-21 01:06:03,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:06:03,880 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 01:06:03,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:06:03,918 INFO L225 Difference]: With dead ends: 9804 [2020-07-21 01:06:03,918 INFO L226 Difference]: Without dead ends: 6538 [2020-07-21 01:06:03,934 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:03,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6538 states. [2020-07-21 01:06:04,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6538 to 6536. [2020-07-21 01:06:04,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6536 states. [2020-07-21 01:06:04,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6536 states to 6536 states and 7814 transitions. [2020-07-21 01:06:04,247 INFO L78 Accepts]: Start accepts. Automaton has 6536 states and 7814 transitions. Word has length 26 [2020-07-21 01:06:04,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:06:04,247 INFO L479 AbstractCegarLoop]: Abstraction has 6536 states and 7814 transitions. [2020-07-21 01:06:04,247 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:06:04,248 INFO L276 IsEmpty]: Start isEmpty. Operand 6536 states and 7814 transitions. [2020-07-21 01:06:04,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 01:06:04,264 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:06:04,264 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:06:04,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:04,478 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:06:04,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:06:04,479 INFO L82 PathProgramCache]: Analyzing trace with hash 1257606127, now seen corresponding path program 1 times [2020-07-21 01:06:04,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:06:04,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1536106925] [2020-07-21 01:06:04,480 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:04,532 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:06:04,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:06:04,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:06:04,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:06:04,546 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:06:04,547 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:06:04,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1536106925] [2020-07-21 01:06:04,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:06:04,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:06:04,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304304296] [2020-07-21 01:06:04,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:06:04,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:06:04,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:06:04,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:04,550 INFO L87 Difference]: Start difference. First operand 6536 states and 7814 transitions. Second operand 3 states. [2020-07-21 01:06:04,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:06:04,694 INFO L93 Difference]: Finished difference Result 7052 states and 8584 transitions. [2020-07-21 01:06:04,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:06:04,695 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 01:06:04,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:06:04,723 INFO L225 Difference]: With dead ends: 7052 [2020-07-21 01:06:04,724 INFO L226 Difference]: Without dead ends: 7050 [2020-07-21 01:06:04,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:04,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7050 states. [2020-07-21 01:06:05,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7050 to 6536. [2020-07-21 01:06:05,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6536 states. [2020-07-21 01:06:05,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6536 states to 6536 states and 7686 transitions. [2020-07-21 01:06:05,091 INFO L78 Accepts]: Start accepts. Automaton has 6536 states and 7686 transitions. Word has length 26 [2020-07-21 01:06:05,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:06:05,091 INFO L479 AbstractCegarLoop]: Abstraction has 6536 states and 7686 transitions. [2020-07-21 01:06:05,091 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:06:05,092 INFO L276 IsEmpty]: Start isEmpty. Operand 6536 states and 7686 transitions. [2020-07-21 01:06:05,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 01:06:05,108 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:06:05,109 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:06:05,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:05,323 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:06:05,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:06:05,324 INFO L82 PathProgramCache]: Analyzing trace with hash -255505650, now seen corresponding path program 1 times [2020-07-21 01:06:05,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:06:05,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [767554185] [2020-07-21 01:06:05,325 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:05,363 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:06:05,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:06:05,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:06:05,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:06:05,385 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:06:05,386 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:06:05,386 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [767554185] [2020-07-21 01:06:05,387 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:06:05,387 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:06:05,387 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996864317] [2020-07-21 01:06:05,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:06:05,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:06:05,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:06:05,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:05,389 INFO L87 Difference]: Start difference. First operand 6536 states and 7686 transitions. Second operand 3 states. [2020-07-21 01:06:05,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:06:05,598 INFO L93 Difference]: Finished difference Result 10634 states and 12423 transitions. [2020-07-21 01:06:05,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:06:05,599 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 01:06:05,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:06:05,638 INFO L225 Difference]: With dead ends: 10634 [2020-07-21 01:06:05,639 INFO L226 Difference]: Without dead ends: 10632 [2020-07-21 01:06:05,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:05,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10632 states. [2020-07-21 01:06:05,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10632 to 10120. [2020-07-21 01:06:05,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10120 states. [2020-07-21 01:06:05,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10120 states to 10120 states and 11654 transitions. [2020-07-21 01:06:05,956 INFO L78 Accepts]: Start accepts. Automaton has 10120 states and 11654 transitions. Word has length 27 [2020-07-21 01:06:05,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:06:05,957 INFO L479 AbstractCegarLoop]: Abstraction has 10120 states and 11654 transitions. [2020-07-21 01:06:05,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:06:05,957 INFO L276 IsEmpty]: Start isEmpty. Operand 10120 states and 11654 transitions. [2020-07-21 01:06:05,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 01:06:05,990 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:06:05,990 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:06:06,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:06,206 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:06:06,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:06:06,207 INFO L82 PathProgramCache]: Analyzing trace with hash 2659788, now seen corresponding path program 1 times [2020-07-21 01:06:06,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:06:06,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [701004314] [2020-07-21 01:06:06,208 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:06,268 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:06:06,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:06:06,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:06:06,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:06:06,283 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:06:06,284 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:06:06,285 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [701004314] [2020-07-21 01:06:06,286 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:06:06,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:06:06,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433210373] [2020-07-21 01:06:06,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:06:06,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:06:06,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:06:06,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:06,289 INFO L87 Difference]: Start difference. First operand 10120 states and 11654 transitions. Second operand 3 states. [2020-07-21 01:06:06,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:06:06,808 INFO L93 Difference]: Finished difference Result 22664 states and 25734 transitions. [2020-07-21 01:06:06,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:06:06,810 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 01:06:06,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:06:06,811 INFO L225 Difference]: With dead ends: 22664 [2020-07-21 01:06:06,811 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 01:06:06,875 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:06,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 01:06:06,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 01:06:06,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 01:06:06,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 01:06:06,878 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 27 [2020-07-21 01:06:06,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:06:06,878 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 01:06:06,878 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:06:06,879 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 01:06:06,879 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 01:06:07,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:07,100 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 01:06:07,216 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 01:06:07,217 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 01:06:07,217 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 01:06:07,217 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 01:06:07,220 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 01:06:07,221 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 01:06:07,221 INFO L268 CegarLoopResult]: For program point L93-1(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,221 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 149) no Hoare annotation was computed. [2020-07-21 01:06:07,222 INFO L268 CegarLoopResult]: For program point L85-1(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,222 INFO L268 CegarLoopResult]: For program point L110(line 110) no Hoare annotation was computed. [2020-07-21 01:06:07,222 INFO L268 CegarLoopResult]: For program point L77-1(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,222 INFO L268 CegarLoopResult]: For program point L135(line 135) no Hoare annotation was computed. [2020-07-21 01:06:07,222 INFO L268 CegarLoopResult]: For program point L69-1(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,222 INFO L268 CegarLoopResult]: For program point L61(lines 61 63) no Hoare annotation was computed. [2020-07-21 01:06:07,223 INFO L268 CegarLoopResult]: For program point L61-2(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,225 INFO L268 CegarLoopResult]: For program point L119-1(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,226 INFO L268 CegarLoopResult]: For program point L120(line 120) no Hoare annotation was computed. [2020-07-21 01:06:07,227 INFO L271 CegarLoopResult]: At program point L145(lines 5 149) the Hoare annotation is: true [2020-07-21 01:06:07,227 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 149) no Hoare annotation was computed. [2020-07-21 01:06:07,227 INFO L268 CegarLoopResult]: For program point L104-1(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,227 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-21 01:06:07,227 INFO L268 CegarLoopResult]: For program point L129-1(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,228 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 147) no Hoare annotation was computed. [2020-07-21 01:06:07,228 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 149) the Hoare annotation is: true [2020-07-21 01:06:07,228 INFO L268 CegarLoopResult]: For program point L105(line 105) no Hoare annotation was computed. [2020-07-21 01:06:07,228 INFO L268 CegarLoopResult]: For program point L130(line 130) no Hoare annotation was computed. [2020-07-21 01:06:07,228 INFO L268 CegarLoopResult]: For program point L89-1(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,228 INFO L268 CegarLoopResult]: For program point L114-1(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,229 INFO L268 CegarLoopResult]: For program point L81-1(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,229 INFO L271 CegarLoopResult]: At program point L139-1(lines 36 144) the Hoare annotation is: true [2020-07-21 01:06:07,229 INFO L268 CegarLoopResult]: For program point L73-1(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,229 INFO L268 CegarLoopResult]: For program point L65-1(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,230 INFO L268 CegarLoopResult]: For program point L115(line 115) no Hoare annotation was computed. [2020-07-21 01:06:07,230 INFO L268 CegarLoopResult]: For program point L140(line 140) no Hoare annotation was computed. [2020-07-21 01:06:07,230 INFO L264 CegarLoopResult]: At program point L140-1(lines 5 149) the Hoare annotation is: false [2020-07-21 01:06:07,230 INFO L268 CegarLoopResult]: For program point L99-1(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,230 INFO L268 CegarLoopResult]: For program point L124-1(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,231 INFO L268 CegarLoopResult]: For program point L100(line 100) no Hoare annotation was computed. [2020-07-21 01:06:07,231 INFO L268 CegarLoopResult]: For program point L125(line 125) no Hoare annotation was computed. [2020-07-21 01:06:07,231 INFO L268 CegarLoopResult]: For program point L109-1(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,231 INFO L268 CegarLoopResult]: For program point L134-1(lines 36 144) no Hoare annotation was computed. [2020-07-21 01:06:07,255 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:06:07 BoogieIcfgContainer [2020-07-21 01:06:07,256 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 01:06:07,264 INFO L168 Benchmark]: Toolchain (without parser) took 14718.50 ms. Allocated memory was 137.9 MB in the beginning and 330.3 MB in the end (delta: 192.4 MB). Free memory was 102.5 MB in the beginning and 180.7 MB in the end (delta: -78.2 MB). Peak memory consumption was 114.2 MB. Max. memory is 7.1 GB. [2020-07-21 01:06:07,265 INFO L168 Benchmark]: CDTParser took 0.39 ms. Allocated memory is still 137.9 MB. Free memory is still 120.6 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 01:06:07,266 INFO L168 Benchmark]: CACSL2BoogieTranslator took 596.70 ms. Allocated memory is still 137.9 MB. Free memory was 102.1 MB in the beginning and 91.4 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2020-07-21 01:06:07,266 INFO L168 Benchmark]: Boogie Preprocessor took 221.47 ms. Allocated memory was 137.9 MB in the beginning and 200.3 MB in the end (delta: 62.4 MB). Free memory was 91.4 MB in the beginning and 177.9 MB in the end (delta: -86.4 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. [2020-07-21 01:06:07,267 INFO L168 Benchmark]: RCFGBuilder took 585.20 ms. Allocated memory is still 200.3 MB. Free memory was 177.9 MB in the beginning and 159.4 MB in the end (delta: 18.5 MB). Peak memory consumption was 18.5 MB. Max. memory is 7.1 GB. [2020-07-21 01:06:07,268 INFO L168 Benchmark]: TraceAbstraction took 13303.51 ms. Allocated memory was 200.3 MB in the beginning and 330.3 MB in the end (delta: 130.0 MB). Free memory was 158.4 MB in the beginning and 180.7 MB in the end (delta: -22.3 MB). Peak memory consumption was 107.7 MB. Max. memory is 7.1 GB. [2020-07-21 01:06:07,270 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.39 ms. Allocated memory is still 137.9 MB. Free memory is still 120.6 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 596.70 ms. Allocated memory is still 137.9 MB. Free memory was 102.1 MB in the beginning and 91.4 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 221.47 ms. Allocated memory was 137.9 MB in the beginning and 200.3 MB in the end (delta: 62.4 MB). Free memory was 91.4 MB in the beginning and 177.9 MB in the end (delta: -86.4 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 585.20 ms. Allocated memory is still 200.3 MB. Free memory was 177.9 MB in the beginning and 159.4 MB in the end (delta: 18.5 MB). Peak memory consumption was 18.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 13303.51 ms. Allocated memory was 200.3 MB in the beginning and 330.3 MB in the end (delta: 130.0 MB). Free memory was 158.4 MB in the beginning and 180.7 MB in the end (delta: -22.3 MB). Peak memory consumption was 107.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 147]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 36]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 41 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 12.9s, OverallIterations: 25, TraceHistogramMax: 1, AutomataDifference: 2.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1937 SDtfs, 926 SDslu, 1314 SDs, 0 SdLazy, 133 SolverSat, 25 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 550 GetRequests, 525 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=10120occurred in iteration=24, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 2.1s AutomataMinimizationTime, 25 MinimizatonAttempts, 2072 StatesRemovedByMinimization, 24 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 522 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.7s SatisfiabilityAnalysisTime, 0.6s InterpolantComputationTime, 575 NumberOfCodeBlocks, 572 NumberOfCodeBlocksAsserted, 99 NumberOfCheckSat, 550 ConstructedInterpolants, 0 QuantifiedInterpolants, 23930 SizeOfPredicates, 0 NumberOfNonLiveVariables, 2549 ConjunctsInSsa, 75 ConjunctsInUnsatCore, 25 InterpolantComputations, 25 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...