/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/locks/test_locks_10.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:50:03,035 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:50:03,039 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:50:03,056 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:50:03,056 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:50:03,058 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:50:03,059 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:50:03,061 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:50:03,063 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:50:03,064 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:50:03,065 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:50:03,066 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:50:03,066 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:50:03,067 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:50:03,068 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:50:03,070 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:50:03,071 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:50:03,072 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:50:03,074 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:50:03,076 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:50:03,077 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:50:03,078 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:50:03,080 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:50:03,080 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:50:03,083 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 13:50:03,084 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 13:50:03,084 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 13:50:03,088 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 13:50:03,088 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 13:50:03,089 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 13:50:03,089 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 13:50:03,090 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 13:50:03,091 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 13:50:03,092 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 13:50:03,093 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 13:50:03,093 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 13:50:03,094 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 13:50:03,094 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 13:50:03,094 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:50:03,095 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:50:03,096 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:50:03,097 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 13:50:03,114 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:50:03,114 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:50:03,116 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:50:03,116 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:50:03,116 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:50:03,116 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:50:03,117 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:50:03,117 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:50:03,117 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:50:03,117 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:50:03,117 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:50:03,118 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:50:03,118 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:50:03,118 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:50:03,118 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:50:03,119 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:50:03,119 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:50:03,119 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:50:03,119 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:50:03,119 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:50:03,120 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:50:03,120 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:50:03,120 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:50:03,120 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:50:03,121 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:50:03,121 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:50:03,121 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:03,121 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:50:03,121 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:50:03,122 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 13:50:03,431 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:50:03,449 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:50:03,456 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:50:03,458 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:50:03,459 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:50:03,461 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_10.c [2020-07-20 13:50:03,554 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fb854b281/4011b974b710468d8eade8387da5ce14/FLAG695bfaedc [2020-07-20 13:50:04,124 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:50:04,125 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_10.c [2020-07-20 13:50:04,137 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fb854b281/4011b974b710468d8eade8387da5ce14/FLAG695bfaedc [2020-07-20 13:50:04,468 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fb854b281/4011b974b710468d8eade8387da5ce14 [2020-07-20 13:50:04,479 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:50:04,483 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:50:04,484 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:50:04,485 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:50:04,489 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:50:04,490 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:50:04" (1/1) ... [2020-07-20 13:50:04,494 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@de58b94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:04, skipping insertion in model container [2020-07-20 13:50:04,494 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:50:04" (1/1) ... [2020-07-20 13:50:04,505 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:50:04,533 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:50:04,743 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:50:04,751 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:50:04,779 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:50:04,795 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:50:04,795 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:04 WrapperNode [2020-07-20 13:50:04,795 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:50:04,796 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:50:04,796 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:50:04,797 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:50:04,910 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:04" (1/1) ... [2020-07-20 13:50:04,911 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:04" (1/1) ... [2020-07-20 13:50:04,918 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:04" (1/1) ... [2020-07-20 13:50:04,918 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:04" (1/1) ... [2020-07-20 13:50:04,928 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:04" (1/1) ... [2020-07-20 13:50:04,936 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:04" (1/1) ... [2020-07-20 13:50:04,938 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:04" (1/1) ... [2020-07-20 13:50:04,941 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:50:04,941 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:50:04,941 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:50:04,942 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:50:04,943 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:04" (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 13:50:05,002 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:50:05,002 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:50:05,002 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:50:05,002 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:50:05,003 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:50:05,003 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:50:05,003 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:50:05,003 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:50:05,295 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:50:05,295 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 13:50:05,303 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:50:05 BoogieIcfgContainer [2020-07-20 13:50:05,303 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:50:05,305 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:50:05,305 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:50:05,309 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:50:05,310 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:50:04" (1/3) ... [2020-07-20 13:50:05,311 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24836906 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:50:05, skipping insertion in model container [2020-07-20 13:50:05,311 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:04" (2/3) ... [2020-07-20 13:50:05,312 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@24836906 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:50:05, skipping insertion in model container [2020-07-20 13:50:05,312 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:50:05" (3/3) ... [2020-07-20 13:50:05,314 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_10.c [2020-07-20 13:50:05,328 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:50:05,336 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:50:05,356 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:50:05,423 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:50:05,424 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:50:05,424 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:50:05,424 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:50:05,425 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:50:05,426 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:50:05,426 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:50:05,426 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:50:05,471 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2020-07-20 13:50:05,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 13:50:05,478 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:05,480 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] [2020-07-20 13:50:05,480 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:05,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:05,487 INFO L82 PathProgramCache]: Analyzing trace with hash -917347053, now seen corresponding path program 1 times [2020-07-20 13:50:05,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:05,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [245447772] [2020-07-20 13:50:05,497 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 13:50:05,612 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:05,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:05,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:05,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:05,668 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 13:50:05,669 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:05,670 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [245447772] [2020-07-20 13:50:05,671 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:05,671 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:05,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872917234] [2020-07-20 13:50:05,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:05,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:05,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:05,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:05,697 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 3 states. [2020-07-20 13:50:05,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:05,767 INFO L93 Difference]: Finished difference Result 87 states and 150 transitions. [2020-07-20 13:50:05,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:05,769 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 13:50:05,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:05,782 INFO L225 Difference]: With dead ends: 87 [2020-07-20 13:50:05,783 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 13:50:05,787 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 [2020-07-20 13:50:05,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 13:50:05,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-20 13:50:05,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 13:50:05,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 89 transitions. [2020-07-20 13:50:05,835 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 89 transitions. Word has length 20 [2020-07-20 13:50:05,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:05,836 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 89 transitions. [2020-07-20 13:50:05,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:05,837 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 89 transitions. [2020-07-20 13:50:05,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 13:50:05,838 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:05,838 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] [2020-07-20 13:50:06,052 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:06,053 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:06,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:06,054 INFO L82 PathProgramCache]: Analyzing trace with hash -1504153067, now seen corresponding path program 1 times [2020-07-20 13:50:06,055 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:06,055 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [686464551] [2020-07-20 13:50:06,056 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 13:50:06,137 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:06,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:06,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:06,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:06,152 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 13:50:06,153 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:06,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [686464551] [2020-07-20 13:50:06,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:06,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:06,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664418477] [2020-07-20 13:50:06,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:06,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:06,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:06,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:06,157 INFO L87 Difference]: Start difference. First operand 50 states and 89 transitions. Second operand 3 states. [2020-07-20 13:50:06,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:06,184 INFO L93 Difference]: Finished difference Result 117 states and 212 transitions. [2020-07-20 13:50:06,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:06,185 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 13:50:06,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:06,187 INFO L225 Difference]: With dead ends: 117 [2020-07-20 13:50:06,187 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 13:50:06,189 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 [2020-07-20 13:50:06,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 13:50:06,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2020-07-20 13:50:06,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 13:50:06,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 125 transitions. [2020-07-20 13:50:06,201 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 125 transitions. Word has length 20 [2020-07-20 13:50:06,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:06,201 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 125 transitions. [2020-07-20 13:50:06,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:06,201 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 125 transitions. [2020-07-20 13:50:06,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 13:50:06,202 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:06,203 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] [2020-07-20 13:50:06,417 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:06,418 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:06,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:06,419 INFO L82 PathProgramCache]: Analyzing trace with hash 1627225809, now seen corresponding path program 1 times [2020-07-20 13:50:06,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:06,420 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1127468888] [2020-07-20 13:50:06,421 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 13:50:06,470 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:06,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:06,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:06,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:06,490 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 13:50:06,491 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:06,491 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1127468888] [2020-07-20 13:50:06,491 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:06,491 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:06,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49696058] [2020-07-20 13:50:06,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:06,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:06,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:06,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:06,493 INFO L87 Difference]: Start difference. First operand 70 states and 125 transitions. Second operand 3 states. [2020-07-20 13:50:06,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:06,538 INFO L93 Difference]: Finished difference Result 133 states and 239 transitions. [2020-07-20 13:50:06,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:06,540 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 13:50:06,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:06,543 INFO L225 Difference]: With dead ends: 133 [2020-07-20 13:50:06,543 INFO L226 Difference]: Without dead ends: 131 [2020-07-20 13:50:06,546 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 [2020-07-20 13:50:06,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2020-07-20 13:50:06,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 93. [2020-07-20 13:50:06,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-20 13:50:06,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 167 transitions. [2020-07-20 13:50:06,574 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 167 transitions. Word has length 21 [2020-07-20 13:50:06,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:06,575 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 167 transitions. [2020-07-20 13:50:06,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:06,575 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 167 transitions. [2020-07-20 13:50:06,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 13:50:06,577 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:06,578 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] [2020-07-20 13:50:06,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:06,793 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:06,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:06,794 INFO L82 PathProgramCache]: Analyzing trace with hash 1040419795, now seen corresponding path program 1 times [2020-07-20 13:50:06,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:06,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1940203148] [2020-07-20 13:50:06,795 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 13:50:06,869 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:06,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:06,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:06,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:06,886 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 13:50:06,887 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:06,888 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1940203148] [2020-07-20 13:50:06,888 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:06,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:06,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985041181] [2020-07-20 13:50:06,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:06,890 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:06,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:06,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:06,891 INFO L87 Difference]: Start difference. First operand 93 states and 167 transitions. Second operand 3 states. [2020-07-20 13:50:06,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:06,933 INFO L93 Difference]: Finished difference Result 221 states and 401 transitions. [2020-07-20 13:50:06,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:06,937 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 13:50:06,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:06,939 INFO L225 Difference]: With dead ends: 221 [2020-07-20 13:50:06,939 INFO L226 Difference]: Without dead ends: 133 [2020-07-20 13:50:06,943 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 [2020-07-20 13:50:06,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-20 13:50:06,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 131. [2020-07-20 13:50:06,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2020-07-20 13:50:06,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 234 transitions. [2020-07-20 13:50:06,969 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 234 transitions. Word has length 21 [2020-07-20 13:50:06,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:06,969 INFO L479 AbstractCegarLoop]: Abstraction has 131 states and 234 transitions. [2020-07-20 13:50:06,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:06,970 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 234 transitions. [2020-07-20 13:50:06,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 13:50:06,971 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:06,971 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] [2020-07-20 13:50:07,182 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:07,183 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:07,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:07,184 INFO L82 PathProgramCache]: Analyzing trace with hash -1095393752, now seen corresponding path program 1 times [2020-07-20 13:50:07,185 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:07,185 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1520461125] [2020-07-20 13:50:07,186 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 13:50:07,257 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:07,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:07,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:07,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:07,273 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 13:50:07,274 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:07,274 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1520461125] [2020-07-20 13:50:07,274 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:07,274 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:07,275 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252956548] [2020-07-20 13:50:07,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:07,275 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:07,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:07,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:07,276 INFO L87 Difference]: Start difference. First operand 131 states and 234 transitions. Second operand 3 states. [2020-07-20 13:50:07,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:07,294 INFO L93 Difference]: Finished difference Result 247 states and 444 transitions. [2020-07-20 13:50:07,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:07,295 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 13:50:07,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:07,297 INFO L225 Difference]: With dead ends: 247 [2020-07-20 13:50:07,298 INFO L226 Difference]: Without dead ends: 245 [2020-07-20 13:50:07,298 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 [2020-07-20 13:50:07,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2020-07-20 13:50:07,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 179. [2020-07-20 13:50:07,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-20 13:50:07,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 318 transitions. [2020-07-20 13:50:07,314 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 318 transitions. Word has length 22 [2020-07-20 13:50:07,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:07,315 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 318 transitions. [2020-07-20 13:50:07,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:07,315 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 318 transitions. [2020-07-20 13:50:07,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 13:50:07,317 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:07,317 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] [2020-07-20 13:50:07,531 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:07,532 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:07,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:07,534 INFO L82 PathProgramCache]: Analyzing trace with hash -1682199766, now seen corresponding path program 1 times [2020-07-20 13:50:07,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:07,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1785276008] [2020-07-20 13:50:07,536 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 13:50:07,573 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:07,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:07,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:07,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:07,590 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 13:50:07,591 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:07,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1785276008] [2020-07-20 13:50:07,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:07,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:07,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336710898] [2020-07-20 13:50:07,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:07,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:07,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:07,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:07,593 INFO L87 Difference]: Start difference. First operand 179 states and 318 transitions. Second operand 3 states. [2020-07-20 13:50:07,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:07,613 INFO L93 Difference]: Finished difference Result 427 states and 764 transitions. [2020-07-20 13:50:07,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:07,614 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 13:50:07,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:07,617 INFO L225 Difference]: With dead ends: 427 [2020-07-20 13:50:07,617 INFO L226 Difference]: Without dead ends: 253 [2020-07-20 13:50:07,619 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 [2020-07-20 13:50:07,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2020-07-20 13:50:07,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 251. [2020-07-20 13:50:07,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2020-07-20 13:50:07,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 442 transitions. [2020-07-20 13:50:07,635 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 442 transitions. Word has length 22 [2020-07-20 13:50:07,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:07,635 INFO L479 AbstractCegarLoop]: Abstraction has 251 states and 442 transitions. [2020-07-20 13:50:07,635 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:07,635 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 442 transitions. [2020-07-20 13:50:07,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 13:50:07,637 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:07,637 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] [2020-07-20 13:50:07,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:07,852 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:07,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:07,853 INFO L82 PathProgramCache]: Analyzing trace with hash 402746118, now seen corresponding path program 1 times [2020-07-20 13:50:07,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:07,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1440525046] [2020-07-20 13:50:07,854 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 [2020-07-20 13:50:07,899 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:07,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:07,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:07,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:07,911 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 13:50:07,912 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:07,912 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1440525046] [2020-07-20 13:50:07,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:07,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:07,913 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640649662] [2020-07-20 13:50:07,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:07,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:07,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:07,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:07,914 INFO L87 Difference]: Start difference. First operand 251 states and 442 transitions. Second operand 3 states. [2020-07-20 13:50:07,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:07,945 INFO L93 Difference]: Finished difference Result 467 states and 828 transitions. [2020-07-20 13:50:07,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:07,947 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 13:50:07,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:07,950 INFO L225 Difference]: With dead ends: 467 [2020-07-20 13:50:07,950 INFO L226 Difference]: Without dead ends: 465 [2020-07-20 13:50:07,951 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 [2020-07-20 13:50:07,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2020-07-20 13:50:07,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 351. [2020-07-20 13:50:07,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2020-07-20 13:50:07,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 610 transitions. [2020-07-20 13:50:07,968 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 610 transitions. Word has length 23 [2020-07-20 13:50:07,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:07,969 INFO L479 AbstractCegarLoop]: Abstraction has 351 states and 610 transitions. [2020-07-20 13:50:07,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:07,969 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 610 transitions. [2020-07-20 13:50:07,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 13:50:07,971 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:07,972 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] [2020-07-20 13:50:08,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:08,187 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:08,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:08,188 INFO L82 PathProgramCache]: Analyzing trace with hash -184059896, now seen corresponding path program 1 times [2020-07-20 13:50:08,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:08,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166493821] [2020-07-20 13:50:08,189 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 [2020-07-20 13:50:08,225 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:08,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:08,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:08,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:08,235 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 13:50:08,236 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:08,236 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [166493821] [2020-07-20 13:50:08,236 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:08,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:08,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945196403] [2020-07-20 13:50:08,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:08,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:08,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:08,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:08,238 INFO L87 Difference]: Start difference. First operand 351 states and 610 transitions. Second operand 3 states. [2020-07-20 13:50:08,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:08,262 INFO L93 Difference]: Finished difference Result 835 states and 1460 transitions. [2020-07-20 13:50:08,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:08,262 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 13:50:08,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:08,266 INFO L225 Difference]: With dead ends: 835 [2020-07-20 13:50:08,266 INFO L226 Difference]: Without dead ends: 489 [2020-07-20 13:50:08,268 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 [2020-07-20 13:50:08,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 489 states. [2020-07-20 13:50:08,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 489 to 487. [2020-07-20 13:50:08,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 487 states. [2020-07-20 13:50:08,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 838 transitions. [2020-07-20 13:50:08,287 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 838 transitions. Word has length 23 [2020-07-20 13:50:08,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:08,288 INFO L479 AbstractCegarLoop]: Abstraction has 487 states and 838 transitions. [2020-07-20 13:50:08,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:08,288 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 838 transitions. [2020-07-20 13:50:08,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 13:50:08,290 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:08,290 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] [2020-07-20 13:50:08,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:08,507 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:08,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:08,507 INFO L82 PathProgramCache]: Analyzing trace with hash -399557827, now seen corresponding path program 1 times [2020-07-20 13:50:08,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:08,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1602631030] [2020-07-20 13:50:08,509 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 [2020-07-20 13:50:08,555 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:08,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:08,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:08,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:08,571 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 13:50:08,576 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:08,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1602631030] [2020-07-20 13:50:08,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:08,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:08,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008453286] [2020-07-20 13:50:08,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:08,578 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:08,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:08,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:08,579 INFO L87 Difference]: Start difference. First operand 487 states and 838 transitions. Second operand 3 states. [2020-07-20 13:50:08,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:08,617 INFO L93 Difference]: Finished difference Result 891 states and 1544 transitions. [2020-07-20 13:50:08,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:08,619 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 13:50:08,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:08,625 INFO L225 Difference]: With dead ends: 891 [2020-07-20 13:50:08,627 INFO L226 Difference]: Without dead ends: 889 [2020-07-20 13:50:08,630 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 [2020-07-20 13:50:08,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 889 states. [2020-07-20 13:50:08,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 889 to 695. [2020-07-20 13:50:08,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 695 states. [2020-07-20 13:50:08,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 695 states to 695 states and 1174 transitions. [2020-07-20 13:50:08,660 INFO L78 Accepts]: Start accepts. Automaton has 695 states and 1174 transitions. Word has length 24 [2020-07-20 13:50:08,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:08,660 INFO L479 AbstractCegarLoop]: Abstraction has 695 states and 1174 transitions. [2020-07-20 13:50:08,661 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:08,661 INFO L276 IsEmpty]: Start isEmpty. Operand 695 states and 1174 transitions. [2020-07-20 13:50:08,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 13:50:08,664 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:08,664 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] [2020-07-20 13:50:08,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:08,880 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:08,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:08,881 INFO L82 PathProgramCache]: Analyzing trace with hash -986363841, now seen corresponding path program 1 times [2020-07-20 13:50:08,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:08,883 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2100824827] [2020-07-20 13:50:08,883 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 [2020-07-20 13:50:08,924 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:08,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:08,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:08,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:08,961 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 13:50:08,961 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:08,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2100824827] [2020-07-20 13:50:08,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:08,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:08,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315932932] [2020-07-20 13:50:08,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:08,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:08,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:08,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:08,966 INFO L87 Difference]: Start difference. First operand 695 states and 1174 transitions. Second operand 3 states. [2020-07-20 13:50:08,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:08,999 INFO L93 Difference]: Finished difference Result 1643 states and 2792 transitions. [2020-07-20 13:50:09,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:09,000 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 13:50:09,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:09,005 INFO L225 Difference]: With dead ends: 1643 [2020-07-20 13:50:09,006 INFO L226 Difference]: Without dead ends: 953 [2020-07-20 13:50:09,008 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 [2020-07-20 13:50:09,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 953 states. [2020-07-20 13:50:09,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 953 to 951. [2020-07-20 13:50:09,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 951 states. [2020-07-20 13:50:09,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 951 states to 951 states and 1590 transitions. [2020-07-20 13:50:09,043 INFO L78 Accepts]: Start accepts. Automaton has 951 states and 1590 transitions. Word has length 24 [2020-07-20 13:50:09,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:09,043 INFO L479 AbstractCegarLoop]: Abstraction has 951 states and 1590 transitions. [2020-07-20 13:50:09,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:09,044 INFO L276 IsEmpty]: Start isEmpty. Operand 951 states and 1590 transitions. [2020-07-20 13:50:09,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 13:50:09,046 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:09,046 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] [2020-07-20 13:50:09,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:09,261 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:09,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:09,261 INFO L82 PathProgramCache]: Analyzing trace with hash 498823995, now seen corresponding path program 1 times [2020-07-20 13:50:09,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:09,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1240603858] [2020-07-20 13:50:09,263 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 [2020-07-20 13:50:09,318 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:09,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:09,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:09,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:09,343 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 13:50:09,343 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:09,344 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1240603858] [2020-07-20 13:50:09,344 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:09,344 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:09,344 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673266896] [2020-07-20 13:50:09,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:09,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:09,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:09,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:09,346 INFO L87 Difference]: Start difference. First operand 951 states and 1590 transitions. Second operand 3 states. [2020-07-20 13:50:09,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:09,379 INFO L93 Difference]: Finished difference Result 1707 states and 2872 transitions. [2020-07-20 13:50:09,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:09,380 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 13:50:09,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:09,390 INFO L225 Difference]: With dead ends: 1707 [2020-07-20 13:50:09,390 INFO L226 Difference]: Without dead ends: 1705 [2020-07-20 13:50:09,392 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 [2020-07-20 13:50:09,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1705 states. [2020-07-20 13:50:09,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1705 to 1383. [2020-07-20 13:50:09,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1383 states. [2020-07-20 13:50:09,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1383 states to 1383 states and 2262 transitions. [2020-07-20 13:50:09,441 INFO L78 Accepts]: Start accepts. Automaton has 1383 states and 2262 transitions. Word has length 25 [2020-07-20 13:50:09,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:09,441 INFO L479 AbstractCegarLoop]: Abstraction has 1383 states and 2262 transitions. [2020-07-20 13:50:09,442 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:09,442 INFO L276 IsEmpty]: Start isEmpty. Operand 1383 states and 2262 transitions. [2020-07-20 13:50:09,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 13:50:09,446 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:09,446 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] [2020-07-20 13:50:09,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:09,662 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:09,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:09,663 INFO L82 PathProgramCache]: Analyzing trace with hash -87982019, now seen corresponding path program 1 times [2020-07-20 13:50:09,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:09,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [344705371] [2020-07-20 13:50:09,664 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 [2020-07-20 13:50:09,737 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:09,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:09,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:09,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:09,762 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 13:50:09,762 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:09,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [344705371] [2020-07-20 13:50:09,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:09,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:09,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932118795] [2020-07-20 13:50:09,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:09,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:09,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:09,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:09,767 INFO L87 Difference]: Start difference. First operand 1383 states and 2262 transitions. Second operand 3 states. [2020-07-20 13:50:09,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:09,808 INFO L93 Difference]: Finished difference Result 2062 states and 3356 transitions. [2020-07-20 13:50:09,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:09,809 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 13:50:09,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:09,818 INFO L225 Difference]: With dead ends: 2062 [2020-07-20 13:50:09,818 INFO L226 Difference]: Without dead ends: 1388 [2020-07-20 13:50:09,821 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 [2020-07-20 13:50:09,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1388 states. [2020-07-20 13:50:09,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1388 to 1386. [2020-07-20 13:50:09,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1386 states. [2020-07-20 13:50:09,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1386 states to 1386 states and 2218 transitions. [2020-07-20 13:50:09,889 INFO L78 Accepts]: Start accepts. Automaton has 1386 states and 2218 transitions. Word has length 25 [2020-07-20 13:50:09,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:09,889 INFO L479 AbstractCegarLoop]: Abstraction has 1386 states and 2218 transitions. [2020-07-20 13:50:09,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:09,890 INFO L276 IsEmpty]: Start isEmpty. Operand 1386 states and 2218 transitions. [2020-07-20 13:50:09,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 13:50:09,895 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:09,895 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] [2020-07-20 13:50:10,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:10,109 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:10,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:10,110 INFO L82 PathProgramCache]: Analyzing trace with hash -2082126725, now seen corresponding path program 1 times [2020-07-20 13:50:10,110 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:10,111 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [709583696] [2020-07-20 13:50:10,111 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 [2020-07-20 13:50:10,165 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:10,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:10,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:10,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:10,177 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:10,177 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:10,177 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [709583696] [2020-07-20 13:50:10,178 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:10,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:10,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897154579] [2020-07-20 13:50:10,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:10,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:10,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:10,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:10,179 INFO L87 Difference]: Start difference. First operand 1386 states and 2218 transitions. Second operand 3 states. [2020-07-20 13:50:10,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:10,217 INFO L93 Difference]: Finished difference Result 2064 states and 3288 transitions. [2020-07-20 13:50:10,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:10,218 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 13:50:10,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:10,227 INFO L225 Difference]: With dead ends: 2064 [2020-07-20 13:50:10,227 INFO L226 Difference]: Without dead ends: 1390 [2020-07-20 13:50:10,230 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 [2020-07-20 13:50:10,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1390 states. [2020-07-20 13:50:10,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1390 to 1388. [2020-07-20 13:50:10,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1388 states. [2020-07-20 13:50:10,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1388 states to 1388 states and 2174 transitions. [2020-07-20 13:50:10,278 INFO L78 Accepts]: Start accepts. Automaton has 1388 states and 2174 transitions. Word has length 25 [2020-07-20 13:50:10,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:10,278 INFO L479 AbstractCegarLoop]: Abstraction has 1388 states and 2174 transitions. [2020-07-20 13:50:10,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:10,278 INFO L276 IsEmpty]: Start isEmpty. Operand 1388 states and 2174 transitions. [2020-07-20 13:50:10,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 13:50:10,281 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:10,281 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] [2020-07-20 13:50:10,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:10,496 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:10,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:10,497 INFO L82 PathProgramCache]: Analyzing trace with hash 624492669, now seen corresponding path program 1 times [2020-07-20 13:50:10,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:10,498 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [852773845] [2020-07-20 13:50:10,498 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 [2020-07-20 13:50:10,531 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:10,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:10,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:10,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:10,545 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 13:50:10,545 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:10,545 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [852773845] [2020-07-20 13:50:10,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:10,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:10,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358058479] [2020-07-20 13:50:10,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:10,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:10,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:10,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:10,547 INFO L87 Difference]: Start difference. First operand 1388 states and 2174 transitions. Second operand 3 states. [2020-07-20 13:50:10,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:10,601 INFO L93 Difference]: Finished difference Result 3248 states and 5120 transitions. [2020-07-20 13:50:10,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:10,602 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 13:50:10,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:10,613 INFO L225 Difference]: With dead ends: 3248 [2020-07-20 13:50:10,613 INFO L226 Difference]: Without dead ends: 1870 [2020-07-20 13:50:10,617 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 [2020-07-20 13:50:10,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1870 states. [2020-07-20 13:50:10,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1870 to 1868. [2020-07-20 13:50:10,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1868 states. [2020-07-20 13:50:10,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1868 states to 1868 states and 2894 transitions. [2020-07-20 13:50:10,677 INFO L78 Accepts]: Start accepts. Automaton has 1868 states and 2894 transitions. Word has length 25 [2020-07-20 13:50:10,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:10,678 INFO L479 AbstractCegarLoop]: Abstraction has 1868 states and 2894 transitions. [2020-07-20 13:50:10,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:10,678 INFO L276 IsEmpty]: Start isEmpty. Operand 1868 states and 2894 transitions. [2020-07-20 13:50:10,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:50:10,681 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:10,682 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] [2020-07-20 13:50:10,895 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:10,896 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:10,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:10,897 INFO L82 PathProgramCache]: Analyzing trace with hash -1104231406, now seen corresponding path program 1 times [2020-07-20 13:50:10,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:10,897 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [88982031] [2020-07-20 13:50:10,897 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 [2020-07-20 13:50:10,955 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:10,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:10,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:10,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:10,971 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 13:50:10,971 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:10,972 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [88982031] [2020-07-20 13:50:10,972 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:10,972 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:10,972 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658077343] [2020-07-20 13:50:10,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:10,973 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:10,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:10,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:10,973 INFO L87 Difference]: Start difference. First operand 1868 states and 2894 transitions. Second operand 3 states. [2020-07-20 13:50:11,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:11,022 INFO L93 Difference]: Finished difference Result 3280 states and 5136 transitions. [2020-07-20 13:50:11,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:11,022 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 13:50:11,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:11,039 INFO L225 Difference]: With dead ends: 3280 [2020-07-20 13:50:11,040 INFO L226 Difference]: Without dead ends: 3278 [2020-07-20 13:50:11,044 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 [2020-07-20 13:50:11,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3278 states. [2020-07-20 13:50:11,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3278 to 2764. [2020-07-20 13:50:11,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2764 states. [2020-07-20 13:50:11,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2764 states to 2764 states and 4174 transitions. [2020-07-20 13:50:11,130 INFO L78 Accepts]: Start accepts. Automaton has 2764 states and 4174 transitions. Word has length 26 [2020-07-20 13:50:11,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:11,132 INFO L479 AbstractCegarLoop]: Abstraction has 2764 states and 4174 transitions. [2020-07-20 13:50:11,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:11,132 INFO L276 IsEmpty]: Start isEmpty. Operand 2764 states and 4174 transitions. [2020-07-20 13:50:11,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:50:11,137 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:11,137 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] [2020-07-20 13:50:11,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:11,351 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:11,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:11,351 INFO L82 PathProgramCache]: Analyzing trace with hash -1691037420, now seen corresponding path program 1 times [2020-07-20 13:50:11,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:11,352 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [54992677] [2020-07-20 13:50:11,352 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 [2020-07-20 13:50:11,392 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:11,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:11,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:11,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:11,403 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 13:50:11,404 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:11,405 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [54992677] [2020-07-20 13:50:11,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:11,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:11,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948473385] [2020-07-20 13:50:11,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:11,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:11,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:11,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:11,410 INFO L87 Difference]: Start difference. First operand 2764 states and 4174 transitions. Second operand 3 states. [2020-07-20 13:50:11,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:11,513 INFO L93 Difference]: Finished difference Result 6416 states and 9744 transitions. [2020-07-20 13:50:11,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:11,514 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 13:50:11,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:11,533 INFO L225 Difference]: With dead ends: 6416 [2020-07-20 13:50:11,534 INFO L226 Difference]: Without dead ends: 3662 [2020-07-20 13:50:11,541 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 [2020-07-20 13:50:11,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3662 states. [2020-07-20 13:50:11,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3662 to 3660. [2020-07-20 13:50:11,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3660 states. [2020-07-20 13:50:11,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3660 states to 3660 states and 5454 transitions. [2020-07-20 13:50:11,652 INFO L78 Accepts]: Start accepts. Automaton has 3660 states and 5454 transitions. Word has length 26 [2020-07-20 13:50:11,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:11,653 INFO L479 AbstractCegarLoop]: Abstraction has 3660 states and 5454 transitions. [2020-07-20 13:50:11,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:11,653 INFO L276 IsEmpty]: Start isEmpty. Operand 3660 states and 5454 transitions. [2020-07-20 13:50:11,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:50:11,658 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:11,658 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] [2020-07-20 13:50:11,871 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:11,872 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:11,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:11,872 INFO L82 PathProgramCache]: Analyzing trace with hash 128780208, now seen corresponding path program 1 times [2020-07-20 13:50:11,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:11,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2006364763] [2020-07-20 13:50:11,873 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 [2020-07-20 13:50:11,912 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:11,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:11,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:11,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:11,933 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 13:50:11,933 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:11,933 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2006364763] [2020-07-20 13:50:11,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:11,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:11,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372714641] [2020-07-20 13:50:11,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:11,935 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:11,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:11,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:11,938 INFO L87 Difference]: Start difference. First operand 3660 states and 5454 transitions. Second operand 3 states. [2020-07-20 13:50:12,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:12,058 INFO L93 Difference]: Finished difference Result 10832 states and 16080 transitions. [2020-07-20 13:50:12,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:12,059 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 13:50:12,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:12,097 INFO L225 Difference]: With dead ends: 10832 [2020-07-20 13:50:12,097 INFO L226 Difference]: Without dead ends: 7182 [2020-07-20 13:50:12,106 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 [2020-07-20 13:50:12,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7182 states. [2020-07-20 13:50:12,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7182 to 7180. [2020-07-20 13:50:12,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7180 states. [2020-07-20 13:50:12,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7180 states to 7180 states and 10382 transitions. [2020-07-20 13:50:12,292 INFO L78 Accepts]: Start accepts. Automaton has 7180 states and 10382 transitions. Word has length 27 [2020-07-20 13:50:12,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:12,292 INFO L479 AbstractCegarLoop]: Abstraction has 7180 states and 10382 transitions. [2020-07-20 13:50:12,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:12,292 INFO L276 IsEmpty]: Start isEmpty. Operand 7180 states and 10382 transitions. [2020-07-20 13:50:12,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:50:12,302 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:12,302 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] [2020-07-20 13:50:12,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:12,518 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:12,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:12,518 INFO L82 PathProgramCache]: Analyzing trace with hash 715586222, now seen corresponding path program 1 times [2020-07-20 13:50:12,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:12,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [562797085] [2020-07-20 13:50:12,519 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 [2020-07-20 13:50:12,552 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:12,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:12,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:12,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:12,562 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 13:50:12,562 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:12,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [562797085] [2020-07-20 13:50:12,563 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:12,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:12,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084079804] [2020-07-20 13:50:12,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:12,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:12,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:12,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:12,564 INFO L87 Difference]: Start difference. First operand 7180 states and 10382 transitions. Second operand 3 states. [2020-07-20 13:50:12,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:12,661 INFO L93 Difference]: Finished difference Result 7952 states and 11664 transitions. [2020-07-20 13:50:12,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:12,662 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 13:50:12,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:12,685 INFO L225 Difference]: With dead ends: 7952 [2020-07-20 13:50:12,685 INFO L226 Difference]: Without dead ends: 7950 [2020-07-20 13:50:12,690 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 [2020-07-20 13:50:12,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7950 states. [2020-07-20 13:50:12,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7950 to 7180. [2020-07-20 13:50:12,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7180 states. [2020-07-20 13:50:12,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7180 states to 7180 states and 10254 transitions. [2020-07-20 13:50:12,902 INFO L78 Accepts]: Start accepts. Automaton has 7180 states and 10254 transitions. Word has length 27 [2020-07-20 13:50:12,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:12,903 INFO L479 AbstractCegarLoop]: Abstraction has 7180 states and 10254 transitions. [2020-07-20 13:50:12,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:12,903 INFO L276 IsEmpty]: Start isEmpty. Operand 7180 states and 10254 transitions. [2020-07-20 13:50:12,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 13:50:12,913 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:12,913 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:13,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:13,129 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:13,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:13,129 INFO L82 PathProgramCache]: Analyzing trace with hash -302565081, now seen corresponding path program 1 times [2020-07-20 13:50:13,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:13,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1264012497] [2020-07-20 13:50:13,130 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 [2020-07-20 13:50:13,163 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:13,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:13,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:13,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:13,171 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 13:50:13,171 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:13,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1264012497] [2020-07-20 13:50:13,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:13,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:13,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336830565] [2020-07-20 13:50:13,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:13,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:13,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:13,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:13,173 INFO L87 Difference]: Start difference. First operand 7180 states and 10254 transitions. Second operand 3 states. [2020-07-20 13:50:13,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:13,300 INFO L93 Difference]: Finished difference Result 12048 states and 17168 transitions. [2020-07-20 13:50:13,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:13,300 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-20 13:50:13,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:13,332 INFO L225 Difference]: With dead ends: 12048 [2020-07-20 13:50:13,333 INFO L226 Difference]: Without dead ends: 12046 [2020-07-20 13:50:13,340 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:13,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12046 states. [2020-07-20 13:50:13,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12046 to 11020. [2020-07-20 13:50:13,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11020 states. [2020-07-20 13:50:13,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11020 states to 11020 states and 15374 transitions. [2020-07-20 13:50:13,704 INFO L78 Accepts]: Start accepts. Automaton has 11020 states and 15374 transitions. Word has length 28 [2020-07-20 13:50:13,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:13,705 INFO L479 AbstractCegarLoop]: Abstraction has 11020 states and 15374 transitions. [2020-07-20 13:50:13,705 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:13,705 INFO L276 IsEmpty]: Start isEmpty. Operand 11020 states and 15374 transitions. [2020-07-20 13:50:13,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 13:50:13,723 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:13,723 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:13,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:13,937 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:13,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:13,937 INFO L82 PathProgramCache]: Analyzing trace with hash -889371095, now seen corresponding path program 1 times [2020-07-20 13:50:13,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:13,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [367464744] [2020-07-20 13:50:13,938 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 [2020-07-20 13:50:13,971 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:13,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:13,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:13,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:13,984 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 13:50:13,985 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:13,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [367464744] [2020-07-20 13:50:13,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:13,986 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:13,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046609697] [2020-07-20 13:50:13,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:13,987 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:13,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:13,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:13,987 INFO L87 Difference]: Start difference. First operand 11020 states and 15374 transitions. Second operand 3 states. [2020-07-20 13:50:14,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:14,180 INFO L93 Difference]: Finished difference Result 25104 states and 35088 transitions. [2020-07-20 13:50:14,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:14,180 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-20 13:50:14,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:14,211 INFO L225 Difference]: With dead ends: 25104 [2020-07-20 13:50:14,211 INFO L226 Difference]: Without dead ends: 14094 [2020-07-20 13:50:14,239 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:14,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14094 states. [2020-07-20 13:50:14,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14094 to 14092. [2020-07-20 13:50:14,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14092 states. [2020-07-20 13:50:14,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14092 states to 14092 states and 19214 transitions. [2020-07-20 13:50:14,705 INFO L78 Accepts]: Start accepts. Automaton has 14092 states and 19214 transitions. Word has length 28 [2020-07-20 13:50:14,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:14,705 INFO L479 AbstractCegarLoop]: Abstraction has 14092 states and 19214 transitions. [2020-07-20 13:50:14,706 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:14,706 INFO L276 IsEmpty]: Start isEmpty. Operand 14092 states and 19214 transitions. [2020-07-20 13:50:14,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 13:50:14,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:14,725 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:14,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:14,942 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:14,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:14,942 INFO L82 PathProgramCache]: Analyzing trace with hash -789366811, now seen corresponding path program 1 times [2020-07-20 13:50:14,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:14,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [678155009] [2020-07-20 13:50:14,943 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 [2020-07-20 13:50:14,975 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:14,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:14,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:14,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:14,984 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 13:50:14,984 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:14,984 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [678155009] [2020-07-20 13:50:14,984 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:14,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:14,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876281917] [2020-07-20 13:50:14,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:14,985 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:14,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:14,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:14,986 INFO L87 Difference]: Start difference. First operand 14092 states and 19214 transitions. Second operand 3 states. [2020-07-20 13:50:15,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:15,203 INFO L93 Difference]: Finished difference Result 23054 states and 30991 transitions. [2020-07-20 13:50:15,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:15,204 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-20 13:50:15,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:15,255 INFO L225 Difference]: With dead ends: 23054 [2020-07-20 13:50:15,255 INFO L226 Difference]: Without dead ends: 23052 [2020-07-20 13:50:15,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:15,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23052 states. [2020-07-20 13:50:16,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23052 to 22028. [2020-07-20 13:50:16,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22028 states. [2020-07-20 13:50:16,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22028 states to 22028 states and 29454 transitions. [2020-07-20 13:50:16,157 INFO L78 Accepts]: Start accepts. Automaton has 22028 states and 29454 transitions. Word has length 29 [2020-07-20 13:50:16,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:16,158 INFO L479 AbstractCegarLoop]: Abstraction has 22028 states and 29454 transitions. [2020-07-20 13:50:16,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:16,158 INFO L276 IsEmpty]: Start isEmpty. Operand 22028 states and 29454 transitions. [2020-07-20 13:50:16,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 13:50:16,195 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:16,195 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:16,410 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:16,411 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:16,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:16,411 INFO L82 PathProgramCache]: Analyzing trace with hash -1376172825, now seen corresponding path program 1 times [2020-07-20 13:50:16,412 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:16,412 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [478869752] [2020-07-20 13:50:16,413 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 [2020-07-20 13:50:16,447 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:16,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:16,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:16,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:16,459 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 13:50:16,459 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:16,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [478869752] [2020-07-20 13:50:16,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:16,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:16,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951771655] [2020-07-20 13:50:16,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:16,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:16,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:16,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:16,461 INFO L87 Difference]: Start difference. First operand 22028 states and 29454 transitions. Second operand 3 states. [2020-07-20 13:50:16,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:16,634 INFO L93 Difference]: Finished difference Result 32788 states and 43544 transitions. [2020-07-20 13:50:16,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:16,635 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-20 13:50:16,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:16,676 INFO L225 Difference]: With dead ends: 32788 [2020-07-20 13:50:16,677 INFO L226 Difference]: Without dead ends: 22034 [2020-07-20 13:50:16,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:16,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22034 states. [2020-07-20 13:50:17,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22034 to 22032. [2020-07-20 13:50:17,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22032 states. [2020-07-20 13:50:17,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22032 states to 22032 states and 28694 transitions. [2020-07-20 13:50:17,275 INFO L78 Accepts]: Start accepts. Automaton has 22032 states and 28694 transitions. Word has length 29 [2020-07-20 13:50:17,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:17,276 INFO L479 AbstractCegarLoop]: Abstraction has 22032 states and 28694 transitions. [2020-07-20 13:50:17,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:17,276 INFO L276 IsEmpty]: Start isEmpty. Operand 22032 states and 28694 transitions. [2020-07-20 13:50:17,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 13:50:17,324 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:17,324 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:17,538 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:17,539 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:17,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:17,540 INFO L82 PathProgramCache]: Analyzing trace with hash 2101146021, now seen corresponding path program 1 times [2020-07-20 13:50:17,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:17,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1810366360] [2020-07-20 13:50:17,541 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 [2020-07-20 13:50:17,573 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:17,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:17,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:17,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:17,587 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 13:50:17,587 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:17,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1810366360] [2020-07-20 13:50:17,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:17,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:17,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166222742] [2020-07-20 13:50:17,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:17,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:17,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:17,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:17,590 INFO L87 Difference]: Start difference. First operand 22032 states and 28694 transitions. Second operand 3 states. [2020-07-20 13:50:17,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:17,772 INFO L93 Difference]: Finished difference Result 32796 states and 42408 transitions. [2020-07-20 13:50:17,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:17,773 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-20 13:50:17,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:17,829 INFO L225 Difference]: With dead ends: 32796 [2020-07-20 13:50:17,829 INFO L226 Difference]: Without dead ends: 22042 [2020-07-20 13:50:17,858 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:17,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22042 states. [2020-07-20 13:50:18,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22042 to 22040. [2020-07-20 13:50:18,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22040 states. [2020-07-20 13:50:18,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22040 states to 22040 states and 27942 transitions. [2020-07-20 13:50:18,474 INFO L78 Accepts]: Start accepts. Automaton has 22040 states and 27942 transitions. Word has length 29 [2020-07-20 13:50:18,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:18,474 INFO L479 AbstractCegarLoop]: Abstraction has 22040 states and 27942 transitions. [2020-07-20 13:50:18,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:18,475 INFO L276 IsEmpty]: Start isEmpty. Operand 22040 states and 27942 transitions. [2020-07-20 13:50:18,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 13:50:18,502 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:18,502 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:18,719 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:18,720 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:18,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:18,721 INFO L82 PathProgramCache]: Analyzing trace with hash 412202279, now seen corresponding path program 1 times [2020-07-20 13:50:18,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:18,722 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1865139258] [2020-07-20 13:50:18,722 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 [2020-07-20 13:50:18,753 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:18,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:18,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:18,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:18,768 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:18,768 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:18,768 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1865139258] [2020-07-20 13:50:18,768 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:18,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:18,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205353545] [2020-07-20 13:50:18,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:18,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:18,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:18,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:18,770 INFO L87 Difference]: Start difference. First operand 22040 states and 27942 transitions. Second operand 3 states. [2020-07-20 13:50:18,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:18,959 INFO L93 Difference]: Finished difference Result 32812 states and 41288 transitions. [2020-07-20 13:50:18,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:18,960 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-20 13:50:18,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:18,996 INFO L225 Difference]: With dead ends: 32812 [2020-07-20 13:50:18,996 INFO L226 Difference]: Without dead ends: 22058 [2020-07-20 13:50:19,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:19,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22058 states. [2020-07-20 13:50:20,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22058 to 22056. [2020-07-20 13:50:20,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22056 states. [2020-07-20 13:50:20,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22056 states to 22056 states and 27206 transitions. [2020-07-20 13:50:20,067 INFO L78 Accepts]: Start accepts. Automaton has 22056 states and 27206 transitions. Word has length 29 [2020-07-20 13:50:20,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:20,067 INFO L479 AbstractCegarLoop]: Abstraction has 22056 states and 27206 transitions. [2020-07-20 13:50:20,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:20,067 INFO L276 IsEmpty]: Start isEmpty. Operand 22056 states and 27206 transitions. [2020-07-20 13:50:20,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 13:50:20,087 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:20,087 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, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:20,303 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:20,303 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:20,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:20,304 INFO L82 PathProgramCache]: Analyzing trace with hash -1581942427, now seen corresponding path program 1 times [2020-07-20 13:50:20,304 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:20,305 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321455207] [2020-07-20 13:50:20,305 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 [2020-07-20 13:50:20,340 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:20,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:20,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:20,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:20,348 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:20,348 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:20,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321455207] [2020-07-20 13:50:20,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:20,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:20,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271724714] [2020-07-20 13:50:20,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:20,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:20,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:20,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:20,350 INFO L87 Difference]: Start difference. First operand 22056 states and 27206 transitions. Second operand 3 states. [2020-07-20 13:50:20,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:20,614 INFO L93 Difference]: Finished difference Result 49704 states and 60998 transitions. [2020-07-20 13:50:20,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:20,615 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-20 13:50:20,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:20,615 INFO L225 Difference]: With dead ends: 49704 [2020-07-20 13:50:20,615 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 13:50:20,673 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:20,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 13:50:20,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 13:50:20,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 13:50:20,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 13:50:20,674 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 29 [2020-07-20 13:50:20,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:20,674 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 13:50:20,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:20,674 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 13:50:20,674 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 13:50:20,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:20,893 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 13:50:20,947 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 13:50:20,947 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 13:50:20,948 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 13:50:20,948 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 13:50:20,948 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 13:50:20,948 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 13:50:20,948 INFO L271 CegarLoopResult]: At program point L159(lines 5 163) the Hoare annotation is: true [2020-07-20 13:50:20,948 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 163) no Hoare annotation was computed. [2020-07-20 13:50:20,948 INFO L268 CegarLoopResult]: For program point L118-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,949 INFO L268 CegarLoopResult]: For program point L143-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,949 INFO L268 CegarLoopResult]: For program point L102-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,949 INFO L268 CegarLoopResult]: For program point L94-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,949 INFO L268 CegarLoopResult]: For program point L119(line 119) no Hoare annotation was computed. [2020-07-20 13:50:20,949 INFO L268 CegarLoopResult]: For program point L86-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,949 INFO L268 CegarLoopResult]: For program point L144(line 144) no Hoare annotation was computed. [2020-07-20 13:50:20,949 INFO L268 CegarLoopResult]: For program point L78-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,949 INFO L268 CegarLoopResult]: For program point L70-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,950 INFO L268 CegarLoopResult]: For program point L128-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,950 INFO L271 CegarLoopResult]: At program point L153-1(lines 39 158) the Hoare annotation is: true [2020-07-20 13:50:20,950 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 163) no Hoare annotation was computed. [2020-07-20 13:50:20,950 INFO L268 CegarLoopResult]: For program point L129(line 129) no Hoare annotation was computed. [2020-07-20 13:50:20,950 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 161) no Hoare annotation was computed. [2020-07-20 13:50:20,950 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 163) the Hoare annotation is: true [2020-07-20 13:50:20,950 INFO L268 CegarLoopResult]: For program point L154(line 154) no Hoare annotation was computed. [2020-07-20 13:50:20,951 INFO L264 CegarLoopResult]: At program point L154-1(lines 5 163) the Hoare annotation is: false [2020-07-20 13:50:20,951 INFO L268 CegarLoopResult]: For program point L113-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,951 INFO L268 CegarLoopResult]: For program point L138-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,951 INFO L268 CegarLoopResult]: For program point L114(line 114) no Hoare annotation was computed. [2020-07-20 13:50:20,951 INFO L268 CegarLoopResult]: For program point L139(line 139) no Hoare annotation was computed. [2020-07-20 13:50:20,951 INFO L268 CegarLoopResult]: For program point L98-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,951 INFO L268 CegarLoopResult]: For program point L123-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,951 INFO L268 CegarLoopResult]: For program point L90-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,951 INFO L268 CegarLoopResult]: For program point L148-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,952 INFO L268 CegarLoopResult]: For program point L82-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,952 INFO L268 CegarLoopResult]: For program point L41(lines 41 43) no Hoare annotation was computed. [2020-07-20 13:50:20,952 INFO L268 CegarLoopResult]: For program point L74-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,952 INFO L268 CegarLoopResult]: For program point L66(lines 66 68) no Hoare annotation was computed. [2020-07-20 13:50:20,952 INFO L268 CegarLoopResult]: For program point L66-2(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,952 INFO L268 CegarLoopResult]: For program point L124(line 124) no Hoare annotation was computed. [2020-07-20 13:50:20,952 INFO L268 CegarLoopResult]: For program point L149(line 149) no Hoare annotation was computed. [2020-07-20 13:50:20,952 INFO L268 CegarLoopResult]: For program point L108-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,952 INFO L268 CegarLoopResult]: For program point L133-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 13:50:20,953 INFO L268 CegarLoopResult]: For program point L109(line 109) no Hoare annotation was computed. [2020-07-20 13:50:20,953 INFO L268 CegarLoopResult]: For program point L134(line 134) no Hoare annotation was computed. [2020-07-20 13:50:20,964 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 01:50:20 BoogieIcfgContainer [2020-07-20 13:50:20,964 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 13:50:20,967 INFO L168 Benchmark]: Toolchain (without parser) took 16485.28 ms. Allocated memory was 140.5 MB in the beginning and 695.2 MB in the end (delta: 554.7 MB). Free memory was 100.2 MB in the beginning and 334.2 MB in the end (delta: -234.0 MB). Peak memory consumption was 320.7 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:20,967 INFO L168 Benchmark]: CDTParser took 0.53 ms. Allocated memory is still 140.5 MB. Free memory was 118.5 MB in the beginning and 118.3 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-20 13:50:20,968 INFO L168 Benchmark]: CACSL2BoogieTranslator took 311.33 ms. Allocated memory is still 140.5 MB. Free memory was 99.9 MB in the beginning and 89.1 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:20,968 INFO L168 Benchmark]: Boogie Preprocessor took 144.68 ms. Allocated memory was 140.5 MB in the beginning and 200.3 MB in the end (delta: 59.8 MB). Free memory was 89.1 MB in the beginning and 178.4 MB in the end (delta: -89.2 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:20,969 INFO L168 Benchmark]: RCFGBuilder took 362.03 ms. Allocated memory is still 200.3 MB. Free memory was 178.4 MB in the beginning and 158.8 MB in the end (delta: 19.6 MB). Peak memory consumption was 19.6 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:20,969 INFO L168 Benchmark]: TraceAbstraction took 15659.40 ms. Allocated memory was 200.3 MB in the beginning and 695.2 MB in the end (delta: 494.9 MB). Free memory was 158.8 MB in the beginning and 334.2 MB in the end (delta: -175.4 MB). Peak memory consumption was 319.5 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:20,972 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.53 ms. Allocated memory is still 140.5 MB. Free memory was 118.5 MB in the beginning and 118.3 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 311.33 ms. Allocated memory is still 140.5 MB. Free memory was 99.9 MB in the beginning and 89.1 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 144.68 ms. Allocated memory was 140.5 MB in the beginning and 200.3 MB in the end (delta: 59.8 MB). Free memory was 89.1 MB in the beginning and 178.4 MB in the end (delta: -89.2 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 362.03 ms. Allocated memory is still 200.3 MB. Free memory was 178.4 MB in the beginning and 158.8 MB in the end (delta: 19.6 MB). Peak memory consumption was 19.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 15659.40 ms. Allocated memory was 200.3 MB in the beginning and 695.2 MB in the end (delta: 494.9 MB). Free memory was 158.8 MB in the beginning and 334.2 MB in the end (delta: -175.4 MB). Peak memory consumption was 319.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 161]: 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: 39]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 44 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 15.4s, OverallIterations: 25, TraceHistogramMax: 1, AutomataDifference: 2.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 2082 SDtfs, 1000 SDslu, 1438 SDs, 0 SdLazy, 134 SolverSat, 25 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 602 GetRequests, 577 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22056occurred 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: 4.9s AutomataMinimizationTime, 25 MinimizatonAttempts, 4118 StatesRemovedByMinimization, 24 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 1034 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 627 NumberOfCodeBlocks, 473 NumberOfCodeBlocksAsserted, 71 NumberOfCheckSat, 602 ConstructedInterpolants, 0 QuantifiedInterpolants, 28544 SizeOfPredicates, 0 NumberOfNonLiveVariables, 2603 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...