/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 NUM_FUNCTIONS --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/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 14:36:31,866 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 14:36:31,871 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 14:36:31,900 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 14:36:31,900 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 14:36:31,904 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 14:36:31,907 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 14:36:31,922 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 14:36:31,925 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 14:36:31,927 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 14:36:31,930 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 14:36:31,933 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 14:36:31,933 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 14:36:31,938 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 14:36:31,942 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 14:36:31,946 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 14:36:31,949 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 14:36:31,951 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 14:36:31,954 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 14:36:31,963 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 14:36:31,971 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 14:36:31,976 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 14:36:31,978 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 14:36:31,979 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 14:36:31,982 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 14:36:31,997 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 14:36:31,998 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 14:36:32,000 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 14:36:32,002 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 [2020-07-20 14:36:32,047 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 14:36:32,048 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 14:36:32,053 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 14:36:32,057 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 14:36:32,057 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 14:36:32,057 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 14:36:32,057 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 14:36:32,058 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 14:36:32,058 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 14:36:32,058 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 14:36:32,058 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 14:36:32,058 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 14:36:32,059 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 14:36:32,059 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 14:36:32,059 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 14:36:32,061 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 14:36:32,062 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 14:36:32,062 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 14:36:32,062 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 14:36:32,063 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 14:36:32,063 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 14:36:32,066 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:36:32,067 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 14:36:32,067 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 14:36:32,067 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 14:36:32,068 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 14:36:32,068 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:36:32,068 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 14:36:32,068 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 14:36:32,068 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 -> NUM_FUNCTIONS 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 [2020-07-20 14:36:32,483 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 14:36:32,502 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 14:36:32,507 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 14:36:32,510 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 14:36:32,510 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 14:36:32,511 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c [2020-07-20 14:36:32,631 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/068d52f28/610d4ab6a7f34284a6a48396d279cfbe/FLAG666b93bd1 [2020-07-20 14:36:33,300 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 14:36:33,301 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c [2020-07-20 14:36:33,327 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/068d52f28/610d4ab6a7f34284a6a48396d279cfbe/FLAG666b93bd1 [2020-07-20 14:36:33,535 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/068d52f28/610d4ab6a7f34284a6a48396d279cfbe [2020-07-20 14:36:33,548 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 14:36:33,551 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 14:36:33,552 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 14:36:33,553 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 14:36:33,558 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 14:36:33,560 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:36:33" (1/1) ... [2020-07-20 14:36:33,564 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@662a784d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:36:33, skipping insertion in model container [2020-07-20 14:36:33,565 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:36:33" (1/1) ... [2020-07-20 14:36:33,576 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 14:36:33,609 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 14:36:33,967 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:36:33,985 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 14:36:34,216 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:36:34,236 INFO L208 MainTranslator]: Completed translation [2020-07-20 14:36:34,237 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:36:34 WrapperNode [2020-07-20 14:36:34,237 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 14:36:34,238 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 14:36:34,238 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 14:36:34,239 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 14:36:34,255 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:36:34" (1/1) ... [2020-07-20 14:36:34,255 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:36:34" (1/1) ... [2020-07-20 14:36:34,279 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:36:34" (1/1) ... [2020-07-20 14:36:34,280 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:36:34" (1/1) ... [2020-07-20 14:36:34,319 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:36:34" (1/1) ... [2020-07-20 14:36:34,326 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:36:34" (1/1) ... [2020-07-20 14:36:34,331 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:36:34" (1/1) ... [2020-07-20 14:36:34,338 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 14:36:34,339 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 14:36:34,340 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 14:36:34,340 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 14:36:34,343 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:36:34" (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 [2020-07-20 14:36:34,458 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 14:36:34,459 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 14:36:34,459 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 14:36:34,459 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 14:36:34,460 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_89 [2020-07-20 14:36:34,460 INFO L130 BoogieDeclarations]: Found specification of procedure fopen [2020-07-20 14:36:34,460 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 14:36:34,460 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 14:36:34,460 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 14:36:34,461 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 14:36:34,461 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-20 14:36:34,461 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-07-20 14:36:34,461 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 14:36:34,462 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 14:36:34,462 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 14:36:34,462 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-20 14:36:34,462 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 14:36:37,450 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 14:36:37,450 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 14:36:37,465 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:36:37 BoogieIcfgContainer [2020-07-20 14:36:37,465 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 14:36:37,469 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 14:36:37,470 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 14:36:37,475 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 14:36:37,476 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 02:36:33" (1/3) ... [2020-07-20 14:36:37,477 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@192d4ada and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:36:37, skipping insertion in model container [2020-07-20 14:36:37,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:36:34" (2/3) ... [2020-07-20 14:36:37,481 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@192d4ada and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:36:37, skipping insertion in model container [2020-07-20 14:36:37,482 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:36:37" (3/3) ... [2020-07-20 14:36:37,486 INFO L109 eAbstractionObserver]: Analyzing ICFG aiob_4.c.v+cfa-reducer.c [2020-07-20 14:36:37,504 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 14:36:37,519 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 14:36:37,542 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 14:36:37,575 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 14:36:37,575 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 14:36:37,575 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 14:36:37,575 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 14:36:37,575 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 14:36:37,576 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 14:36:37,576 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 14:36:37,576 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 14:36:37,600 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-07-20 14:36:37,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 14:36:37,610 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:36:37,612 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:36:37,613 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:36:37,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:36:37,623 INFO L82 PathProgramCache]: Analyzing trace with hash 316900320, now seen corresponding path program 1 times [2020-07-20 14:36:37,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:36:37,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602337542] [2020-07-20 14:36:37,638 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 [2020-07-20 14:36:44,726 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:36:44,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:36:44,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 14:36:44,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:36:44,829 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:36:44,830 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:36:44,833 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602337542] [2020-07-20 14:36:44,835 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:36:44,835 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 14:36:44,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054172116] [2020-07-20 14:36:44,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 14:36:44,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:36:44,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 14:36:44,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 14:36:44,871 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 4 states. [2020-07-20 14:36:44,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:36:44,972 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2020-07-20 14:36:44,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 14:36:44,975 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2020-07-20 14:36:44,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:36:44,994 INFO L225 Difference]: With dead ends: 46 [2020-07-20 14:36:44,995 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 14:36:45,001 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 14:36:45,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 14:36:45,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 18. [2020-07-20 14:36:45,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 14:36:45,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 14:36:45,063 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 14:36:45,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:36:45,064 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 14:36:45,064 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 14:36:45,064 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 14:36:45,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 14:36:45,065 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:36:45,065 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:36:45,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:36:45,283 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:36:45,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:36:45,285 INFO L82 PathProgramCache]: Analyzing trace with hash 316483246, now seen corresponding path program 1 times [2020-07-20 14:36:45,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:36:45,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1021364261] [2020-07-20 14:36:45,286 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 [2020-07-20 14:36:52,519 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:36:52,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:36:52,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 14:36:52,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:36:52,572 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:36:52,572 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:36:52,573 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1021364261] [2020-07-20 14:36:52,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:36:52,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 14:36:52,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567845943] [2020-07-20 14:36:52,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 14:36:52,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:36:52,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 14:36:52,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 14:36:52,578 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 4 states. [2020-07-20 14:36:52,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:36:52,650 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2020-07-20 14:36:52,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 14:36:52,654 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2020-07-20 14:36:52,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:36:52,657 INFO L225 Difference]: With dead ends: 28 [2020-07-20 14:36:52,657 INFO L226 Difference]: Without dead ends: 26 [2020-07-20 14:36:52,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 14:36:52,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-20 14:36:52,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2020-07-20 14:36:52,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-20 14:36:52,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-07-20 14:36:52,690 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 13 [2020-07-20 14:36:52,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:36:52,691 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-07-20 14:36:52,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 14:36:52,691 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-07-20 14:36:52,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 14:36:52,696 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:36:52,696 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:36:52,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:36:52,900 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:36:52,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:36:52,901 INFO L82 PathProgramCache]: Analyzing trace with hash 625969832, now seen corresponding path program 1 times [2020-07-20 14:36:52,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:36:52,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1978438191] [2020-07-20 14:36:52,903 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 [2020-07-20 14:37:17,268 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:37:17,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:37:17,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 14:37:17,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:37:17,373 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:37:17,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:37:17,463 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:37:17,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1978438191] [2020-07-20 14:37:17,467 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:37:17,467 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-20 14:37:17,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594289181] [2020-07-20 14:37:17,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 14:37:17,471 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:37:17,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 14:37:17,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-07-20 14:37:17,474 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 8 states. [2020-07-20 14:37:19,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:37:19,841 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2020-07-20 14:37:19,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 14:37:19,842 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2020-07-20 14:37:19,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:37:19,844 INFO L225 Difference]: With dead ends: 53 [2020-07-20 14:37:19,844 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 14:37:19,846 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2020-07-20 14:37:19,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 14:37:19,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 38. [2020-07-20 14:37:19,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-20 14:37:19,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2020-07-20 14:37:19,857 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 19 [2020-07-20 14:37:19,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:37:19,858 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2020-07-20 14:37:19,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 14:37:19,858 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2020-07-20 14:37:19,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-20 14:37:19,860 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:37:19,861 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:37:20,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:37:20,062 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:37:20,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:37:20,064 INFO L82 PathProgramCache]: Analyzing trace with hash 599808768, now seen corresponding path program 2 times [2020-07-20 14:37:20,065 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:37:20,065 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2053072779] [2020-07-20 14:37:20,065 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 [2020-07-20 14:38:18,046 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:38:18,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:38:19,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 14:38:19,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:38:19,545 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 8 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:38:19,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:38:19,779 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 8 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:38:19,785 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2053072779] [2020-07-20 14:38:19,785 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:38:19,786 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-07-20 14:38:19,786 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752329545] [2020-07-20 14:38:19,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 14:38:19,788 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:38:19,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 14:38:19,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2020-07-20 14:38:19,796 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 14 states. [2020-07-20 14:38:24,678 WARN L193 SmtUtils]: Spent 2.21 s on a formula simplification. DAG size of input: 25 DAG size of output: 15 [2020-07-20 14:38:25,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:38:25,102 INFO L93 Difference]: Finished difference Result 89 states and 97 transitions. [2020-07-20 14:38:25,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 14:38:25,104 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 37 [2020-07-20 14:38:25,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:38:25,106 INFO L225 Difference]: With dead ends: 89 [2020-07-20 14:38:25,106 INFO L226 Difference]: Without dead ends: 79 [2020-07-20 14:38:25,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=192, Invalid=458, Unknown=0, NotChecked=0, Total=650 [2020-07-20 14:38:25,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-07-20 14:38:25,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 74. [2020-07-20 14:38:25,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-07-20 14:38:25,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2020-07-20 14:38:25,124 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 37 [2020-07-20 14:38:25,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:38:25,125 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2020-07-20 14:38:25,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 14:38:25,125 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2020-07-20 14:38:25,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-20 14:38:25,128 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:38:25,129 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:38:25,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:38:25,344 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:38:25,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:38:25,345 INFO L82 PathProgramCache]: Analyzing trace with hash 740837808, now seen corresponding path program 3 times [2020-07-20 14:38:25,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:38:25,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [3999847] [2020-07-20 14:38:25,346 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 [2020-07-20 14:40:29,842 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:40:29,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:40:36,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 14:40:36,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:40:36,960 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 20 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:40:36,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:40:54,338 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 20 proven. 275 refuted. 25 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:40:54,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [3999847] [2020-07-20 14:40:54,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:40:54,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2020-07-20 14:40:54,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348632891] [2020-07-20 14:40:54,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 14:40:54,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:40:54,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 14:40:54,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=471, Unknown=8, NotChecked=0, Total=650 [2020-07-20 14:40:54,343 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand 26 states. [2020-07-20 14:41:16,002 WARN L193 SmtUtils]: Spent 368.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2020-07-20 14:41:16,864 WARN L193 SmtUtils]: Spent 552.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 15 [2020-07-20 14:41:19,558 WARN L193 SmtUtils]: Spent 2.38 s on a formula simplification. DAG size of input: 55 DAG size of output: 15 [2020-07-20 14:41:20,412 WARN L193 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 15 [2020-07-20 14:41:21,854 WARN L193 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 15 [2020-07-20 14:41:29,818 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 15 [2020-07-20 14:41:44,480 WARN L193 SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 25 DAG size of output: 15 [2020-07-20 14:41:51,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:41:51,302 INFO L93 Difference]: Finished difference Result 161 states and 175 transitions. [2020-07-20 14:41:51,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 14:41:51,305 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 73 [2020-07-20 14:41:51,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:41:51,308 INFO L225 Difference]: With dead ends: 161 [2020-07-20 14:41:51,308 INFO L226 Difference]: Without dead ends: 151 [2020-07-20 14:41:51,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 44.9s TimeCoverageRelationStatistics Valid=665, Invalid=1775, Unknown=10, NotChecked=0, Total=2450 [2020-07-20 14:41:51,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2020-07-20 14:41:51,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 146. [2020-07-20 14:41:51,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2020-07-20 14:41:51,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 147 transitions. [2020-07-20 14:41:51,332 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 147 transitions. Word has length 73 [2020-07-20 14:41:51,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:41:51,333 INFO L479 AbstractCegarLoop]: Abstraction has 146 states and 147 transitions. [2020-07-20 14:41:51,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 14:41:51,334 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 147 transitions. [2020-07-20 14:41:51,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-20 14:41:51,337 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:41:51,337 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:41:51,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:41:51,547 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:41:51,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:41:51,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1184145648, now seen corresponding path program 4 times [2020-07-20 14:41:51,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:41:51,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [299479419] [2020-07-20 14:41:51,551 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 [2020-07-20 14:46:46,591 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:46:46,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:47:01,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 887 conjuncts, 49 conjunts are in the unsatisfiable core [2020-07-20 14:47:01,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:47:01,824 INFO L134 CoverageAnalysis]: Checked inductivity of 1496 backedges. 44 proven. 1452 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:47:01,825 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:47:26,348 INFO L134 CoverageAnalysis]: Checked inductivity of 1496 backedges. 44 proven. 1415 refuted. 37 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:47:26,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [299479419] [2020-07-20 14:47:26,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:47:26,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2020-07-20 14:47:26,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034665130] [2020-07-20 14:47:26,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-20 14:47:26,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:47:26,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-20 14:47:26,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=621, Invalid=1818, Unknown=11, NotChecked=0, Total=2450 [2020-07-20 14:47:26,353 INFO L87 Difference]: Start difference. First operand 146 states and 147 transitions. Second operand 50 states. [2020-07-20 14:47:59,640 WARN L193 SmtUtils]: Spent 1.02 s on a formula simplification. DAG size of input: 99 DAG size of output: 14 [2020-07-20 14:48:06,419 WARN L193 SmtUtils]: Spent 1.24 s on a formula simplification. DAG size of input: 100 DAG size of output: 15 [2020-07-20 14:48:15,149 WARN L193 SmtUtils]: Spent 2.49 s on a formula simplification. DAG size of input: 95 DAG size of output: 15 [2020-07-20 14:48:20,713 WARN L193 SmtUtils]: Spent 688.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 15 [2020-07-20 14:48:29,233 WARN L193 SmtUtils]: Spent 1.60 s on a formula simplification. DAG size of input: 85 DAG size of output: 15 [2020-07-20 14:48:32,667 WARN L193 SmtUtils]: Spent 722.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 15 [2020-07-20 14:48:37,878 WARN L193 SmtUtils]: Spent 829.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 15 [2020-07-20 14:48:49,212 WARN L193 SmtUtils]: Spent 594.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 15 [2020-07-20 14:48:58,825 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 15 [2020-07-20 14:49:07,710 WARN L193 SmtUtils]: Spent 2.23 s on a formula simplification. DAG size of input: 60 DAG size of output: 15 [2020-07-20 14:49:15,115 WARN L193 SmtUtils]: Spent 316.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 15 [2020-07-20 14:49:18,825 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 15 [2020-07-20 14:49:28,364 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 15 [2020-07-20 14:49:39,412 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 15 [2020-07-20 14:49:40,476 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 15 [2020-07-20 14:49:57,453 WARN L193 SmtUtils]: Spent 4.20 s on a formula simplification. DAG size of input: 25 DAG size of output: 15 [2020-07-20 14:50:12,678 WARN L193 SmtUtils]: Spent 2.09 s on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:50:12,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:50:12,846 INFO L93 Difference]: Finished difference Result 281 states and 303 transitions. [2020-07-20 14:50:12,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-07-20 14:50:12,847 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 145 [2020-07-20 14:50:12,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:50:12,850 INFO L225 Difference]: With dead ends: 281 [2020-07-20 14:50:12,850 INFO L226 Difference]: Without dead ends: 271 [2020-07-20 14:50:12,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 242 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1069 ImplicationChecksByTransitivity, 156.6s TimeCoverageRelationStatistics Valid=2177, Invalid=6545, Unknown=20, NotChecked=0, Total=8742 [2020-07-20 14:50:12,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2020-07-20 14:50:12,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 266. [2020-07-20 14:50:12,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 266 states. [2020-07-20 14:50:12,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 267 transitions. [2020-07-20 14:50:12,882 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 267 transitions. Word has length 145 [2020-07-20 14:50:12,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:50:12,883 INFO L479 AbstractCegarLoop]: Abstraction has 266 states and 267 transitions. [2020-07-20 14:50:12,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-20 14:50:12,883 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 267 transitions. [2020-07-20 14:50:12,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2020-07-20 14:50:12,888 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:50:12,889 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 43, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:50:13,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:50:13,103 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:50:13,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:50:13,104 INFO L82 PathProgramCache]: Analyzing trace with hash 713884336, now seen corresponding path program 5 times [2020-07-20 14:50:13,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:50:13,105 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1072281806] [2020-07-20 14:50:13,105 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