/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_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.4.ufo.BOUNDED-10.pals.c.p+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 17:35:51,816 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 17:35:51,818 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 17:35:51,837 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 17:35:51,837 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 17:35:51,839 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 17:35:51,841 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 17:35:51,850 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 17:35:51,855 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 17:35:51,858 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 17:35:51,859 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 17:35:51,860 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 17:35:51,860 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 17:35:51,862 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 17:35:51,864 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 17:35:51,865 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 17:35:51,867 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 17:35:51,867 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 17:35:51,869 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 17:35:51,874 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 17:35:51,878 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 17:35:51,882 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 17:35:51,882 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 17:35:51,883 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 17:35:51,885 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 17:35:51,895 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 17:35:51,896 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 17:35:51,897 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 17:35:51,897 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 17:35:51,932 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 17:35:51,933 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 17:35:51,934 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 17:35:51,934 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 17:35:51,934 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 17:35:51,934 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 17:35:51,934 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 17:35:51,934 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 17:35:51,935 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 17:35:51,935 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 17:35:51,935 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 17:35:51,935 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 17:35:51,936 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 17:35:51,937 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 17:35:51,937 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 17:35:51,937 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 17:35:51,937 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 17:35:51,937 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 17:35:51,938 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 17:35:51,938 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 17:35:51,938 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 17:35:51,938 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 17:35:51,939 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 17:35:51,939 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 17:35:51,939 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 17:35:51,939 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 17:35:51,939 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:35:51,939 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 17:35:51,940 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 17:35:51,940 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_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 17:35:52,220 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 17:35:52,232 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 17:35:52,236 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 17:35:52,237 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 17:35:52,237 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 17:35:52,238 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.4.ufo.BOUNDED-10.pals.c.p+lhb-reducer.c [2020-07-21 17:35:52,298 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bdcfcb29e/f79aa63a301e412eb9bce89714ac1607/FLAGb0733e4cb [2020-07-21 17:35:53,022 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 17:35:53,023 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.4.ufo.BOUNDED-10.pals.c.p+lhb-reducer.c [2020-07-21 17:35:53,058 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bdcfcb29e/f79aa63a301e412eb9bce89714ac1607/FLAGb0733e4cb [2020-07-21 17:35:53,131 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bdcfcb29e/f79aa63a301e412eb9bce89714ac1607 [2020-07-21 17:35:53,140 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 17:35:53,143 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 17:35:53,144 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 17:35:53,144 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 17:35:53,147 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 17:35:53,148 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 05:35:53" (1/1) ... [2020-07-21 17:35:53,151 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56d656f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:35:53, skipping insertion in model container [2020-07-21 17:35:53,151 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 05:35:53" (1/1) ... [2020-07-21 17:35:53,159 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 17:35:53,409 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 17:35:55,673 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 17:35:55,693 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 17:35:57,620 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 17:35:57,671 INFO L208 MainTranslator]: Completed translation [2020-07-21 17:35:57,673 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:35:57 WrapperNode [2020-07-21 17:35:57,673 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 17:35:57,674 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 17:35:57,674 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 17:35:57,675 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 17:35:57,696 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:35:57" (1/1) ... [2020-07-21 17:35:57,699 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:35:57" (1/1) ... [2020-07-21 17:35:57,781 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:35:57" (1/1) ... [2020-07-21 17:35:57,781 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:35:57" (1/1) ... [2020-07-21 17:35:57,847 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:35:57" (1/1) ... [2020-07-21 17:35:57,894 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:35:57" (1/1) ... [2020-07-21 17:35:57,910 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:35:57" (1/1) ... [2020-07-21 17:35:57,991 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 17:35:57,992 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 17:35:57,993 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 17:35:57,993 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 17:35:57,994 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:35:57" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 17:35:58,070 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 17:35:58,070 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 17:35:58,070 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 17:35:58,070 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 17:35:58,071 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 17:35:58,071 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 17:35:58,071 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 17:35:58,071 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-21 17:35:58,072 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 17:35:58,072 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 17:35:58,072 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-21 17:35:58,072 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-21 17:35:58,072 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-21 17:35:58,072 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-21 17:35:58,073 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-21 17:35:58,073 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-21 17:35:58,073 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-21 17:35:58,073 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 17:35:58,073 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-21 17:35:58,074 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 17:35:58,074 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 17:35:58,074 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 17:36:03,641 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 17:36:03,641 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 17:36:03,655 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:36:03 BoogieIcfgContainer [2020-07-21 17:36:03,655 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 17:36:03,656 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 17:36:03,656 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 17:36:03,659 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 17:36:03,660 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 05:35:53" (1/3) ... [2020-07-21 17:36:03,660 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fe7603c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 05:36:03, skipping insertion in model container [2020-07-21 17:36:03,661 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:35:57" (2/3) ... [2020-07-21 17:36:03,661 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fe7603c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 05:36:03, skipping insertion in model container [2020-07-21 17:36:03,661 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:36:03" (3/3) ... [2020-07-21 17:36:03,663 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.4.ufo.BOUNDED-10.pals.c.p+lhb-reducer.c [2020-07-21 17:36:03,673 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 17:36:03,682 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-07-21 17:36:03,696 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-07-21 17:36:03,728 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 17:36:03,728 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 17:36:03,729 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 17:36:03,729 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 17:36:03,729 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 17:36:03,729 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 17:36:03,729 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 17:36:03,729 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 17:36:03,778 INFO L276 IsEmpty]: Start isEmpty. Operand 2515 states. [2020-07-21 17:36:03,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-21 17:36:03,817 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:03,819 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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] [2020-07-21 17:36:03,819 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:03,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:03,826 INFO L82 PathProgramCache]: Analyzing trace with hash -1936618047, now seen corresponding path program 1 times [2020-07-21 17:36:03,835 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:03,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739388647] [2020-07-21 17:36:03,836 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:04,357 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:04,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:04,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 1663 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 17:36:04,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:04,592 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:04,593 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:04,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [739388647] [2020-07-21 17:36:04,595 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:04,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 17:36:04,596 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432965649] [2020-07-21 17:36:04,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 17:36:04,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:04,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 17:36:04,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 17:36:04,620 INFO L87 Difference]: Start difference. First operand 2515 states. Second operand 4 states. [2020-07-21 17:36:04,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:36:04,872 INFO L93 Difference]: Finished difference Result 4047 states and 7028 transitions. [2020-07-21 17:36:04,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 17:36:04,875 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 322 [2020-07-21 17:36:04,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:36:04,917 INFO L225 Difference]: With dead ends: 4047 [2020-07-21 17:36:04,917 INFO L226 Difference]: Without dead ends: 2511 [2020-07-21 17:36:04,933 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 17:36:04,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2511 states. [2020-07-21 17:36:05,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2511 to 2511. [2020-07-21 17:36:05,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2511 states. [2020-07-21 17:36:05,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2511 states to 2511 states and 4372 transitions. [2020-07-21 17:36:05,124 INFO L78 Accepts]: Start accepts. Automaton has 2511 states and 4372 transitions. Word has length 322 [2020-07-21 17:36:05,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:05,127 INFO L479 AbstractCegarLoop]: Abstraction has 2511 states and 4372 transitions. [2020-07-21 17:36:05,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 17:36:05,128 INFO L276 IsEmpty]: Start isEmpty. Operand 2511 states and 4372 transitions. [2020-07-21 17:36:05,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 332 [2020-07-21 17:36:05,142 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:05,143 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:36:05,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:05,357 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:05,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:05,357 INFO L82 PathProgramCache]: Analyzing trace with hash 237230463, now seen corresponding path program 1 times [2020-07-21 17:36:05,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:05,358 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [195642424] [2020-07-21 17:36:05,358 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:05,748 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:05,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:05,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 1666 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:36:05,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:05,945 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:05,945 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:05,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [195642424] [2020-07-21 17:36:05,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:05,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:36:05,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086896236] [2020-07-21 17:36:05,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:36:05,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:05,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:36:05,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:05,956 INFO L87 Difference]: Start difference. First operand 2511 states and 4372 transitions. Second operand 3 states. [2020-07-21 17:36:06,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:36:06,356 INFO L93 Difference]: Finished difference Result 5485 states and 9414 transitions. [2020-07-21 17:36:06,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:36:06,356 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 331 [2020-07-21 17:36:06,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:36:06,382 INFO L225 Difference]: With dead ends: 5485 [2020-07-21 17:36:06,383 INFO L226 Difference]: Without dead ends: 3917 [2020-07-21 17:36:06,389 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 329 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:06,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3917 states. [2020-07-21 17:36:06,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3917 to 3913. [2020-07-21 17:36:06,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3913 states. [2020-07-21 17:36:06,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3913 states to 3913 states and 6736 transitions. [2020-07-21 17:36:06,521 INFO L78 Accepts]: Start accepts. Automaton has 3913 states and 6736 transitions. Word has length 331 [2020-07-21 17:36:06,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:06,522 INFO L479 AbstractCegarLoop]: Abstraction has 3913 states and 6736 transitions. [2020-07-21 17:36:06,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:36:06,522 INFO L276 IsEmpty]: Start isEmpty. Operand 3913 states and 6736 transitions. [2020-07-21 17:36:06,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-21 17:36:06,534 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:06,535 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:36:06,747 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:06,749 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:06,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:06,750 INFO L82 PathProgramCache]: Analyzing trace with hash -1663160899, now seen corresponding path program 1 times [2020-07-21 17:36:06,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:06,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [951360953] [2020-07-21 17:36:06,751 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:07,101 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:07,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:07,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 1664 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:36:07,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:07,237 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:07,237 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:07,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [951360953] [2020-07-21 17:36:07,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:07,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:36:07,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629646650] [2020-07-21 17:36:07,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:36:07,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:07,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:36:07,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:07,241 INFO L87 Difference]: Start difference. First operand 3913 states and 6736 transitions. Second operand 3 states. [2020-07-21 17:36:07,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:36:07,731 INFO L93 Difference]: Finished difference Result 7716 states and 13178 transitions. [2020-07-21 17:36:07,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:36:07,732 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 332 [2020-07-21 17:36:07,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:36:07,759 INFO L225 Difference]: With dead ends: 7716 [2020-07-21 17:36:07,759 INFO L226 Difference]: Without dead ends: 5221 [2020-07-21 17:36:07,765 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 330 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:07,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5221 states. [2020-07-21 17:36:07,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5221 to 5054. [2020-07-21 17:36:07,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5054 states. [2020-07-21 17:36:07,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5054 states to 5054 states and 8661 transitions. [2020-07-21 17:36:07,997 INFO L78 Accepts]: Start accepts. Automaton has 5054 states and 8661 transitions. Word has length 332 [2020-07-21 17:36:07,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:07,998 INFO L479 AbstractCegarLoop]: Abstraction has 5054 states and 8661 transitions. [2020-07-21 17:36:07,998 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:36:07,998 INFO L276 IsEmpty]: Start isEmpty. Operand 5054 states and 8661 transitions. [2020-07-21 17:36:08,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 339 [2020-07-21 17:36:08,022 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:08,023 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:36:08,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:08,238 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:08,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:08,239 INFO L82 PathProgramCache]: Analyzing trace with hash -1738401562, now seen corresponding path program 1 times [2020-07-21 17:36:08,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:08,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1334201528] [2020-07-21 17:36:08,240 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:08,804 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:08,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:08,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 1673 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:36:08,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:08,975 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:08,975 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:08,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1334201528] [2020-07-21 17:36:08,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:08,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:36:08,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427326548] [2020-07-21 17:36:08,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:36:08,979 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:08,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:36:08,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:08,980 INFO L87 Difference]: Start difference. First operand 5054 states and 8661 transitions. Second operand 3 states. [2020-07-21 17:36:09,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:36:09,588 INFO L93 Difference]: Finished difference Result 12163 states and 20676 transitions. [2020-07-21 17:36:09,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:36:09,589 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 338 [2020-07-21 17:36:09,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:36:09,642 INFO L225 Difference]: With dead ends: 12163 [2020-07-21 17:36:09,643 INFO L226 Difference]: Without dead ends: 8067 [2020-07-21 17:36:09,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 336 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:09,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8067 states. [2020-07-21 17:36:10,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8067 to 8051. [2020-07-21 17:36:10,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8051 states. [2020-07-21 17:36:10,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8051 states to 8051 states and 13709 transitions. [2020-07-21 17:36:10,206 INFO L78 Accepts]: Start accepts. Automaton has 8051 states and 13709 transitions. Word has length 338 [2020-07-21 17:36:10,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:10,207 INFO L479 AbstractCegarLoop]: Abstraction has 8051 states and 13709 transitions. [2020-07-21 17:36:10,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:36:10,207 INFO L276 IsEmpty]: Start isEmpty. Operand 8051 states and 13709 transitions. [2020-07-21 17:36:10,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 340 [2020-07-21 17:36:10,234 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:10,235 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:36:10,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:10,449 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:10,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:10,451 INFO L82 PathProgramCache]: Analyzing trace with hash -2067598783, now seen corresponding path program 1 times [2020-07-21 17:36:10,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:10,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [910175631] [2020-07-21 17:36:10,452 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:11,145 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:11,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:11,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 1674 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:36:11,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:11,313 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:11,314 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:11,314 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [910175631] [2020-07-21 17:36:11,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:11,315 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:36:11,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778592385] [2020-07-21 17:36:11,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:36:11,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:11,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:36:11,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:11,320 INFO L87 Difference]: Start difference. First operand 8051 states and 13709 transitions. Second operand 3 states. [2020-07-21 17:36:12,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:36:12,167 INFO L93 Difference]: Finished difference Result 20642 states and 34963 transitions. [2020-07-21 17:36:12,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:36:12,168 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 339 [2020-07-21 17:36:12,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:36:12,240 INFO L225 Difference]: With dead ends: 20642 [2020-07-21 17:36:12,241 INFO L226 Difference]: Without dead ends: 13603 [2020-07-21 17:36:12,274 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 337 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:12,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13603 states. [2020-07-21 17:36:13,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13603 to 13572. [2020-07-21 17:36:13,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13572 states. [2020-07-21 17:36:13,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13572 states to 13572 states and 23008 transitions. [2020-07-21 17:36:13,730 INFO L78 Accepts]: Start accepts. Automaton has 13572 states and 23008 transitions. Word has length 339 [2020-07-21 17:36:13,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:13,731 INFO L479 AbstractCegarLoop]: Abstraction has 13572 states and 23008 transitions. [2020-07-21 17:36:13,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:36:13,731 INFO L276 IsEmpty]: Start isEmpty. Operand 13572 states and 23008 transitions. [2020-07-21 17:36:13,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2020-07-21 17:36:13,761 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:13,762 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:36:13,976 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:13,977 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:13,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:13,977 INFO L82 PathProgramCache]: Analyzing trace with hash -1181346913, now seen corresponding path program 1 times [2020-07-21 17:36:13,978 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:13,978 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [776901931] [2020-07-21 17:36:13,978 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:14,383 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:14,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:14,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 1673 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:36:14,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:14,480 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:14,480 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:14,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [776901931] [2020-07-21 17:36:14,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:14,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:36:14,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727905342] [2020-07-21 17:36:14,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:36:14,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:14,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:36:14,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:14,483 INFO L87 Difference]: Start difference. First operand 13572 states and 23008 transitions. Second operand 3 states. [2020-07-21 17:36:15,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:36:15,187 INFO L93 Difference]: Finished difference Result 36085 states and 60978 transitions. [2020-07-21 17:36:15,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:36:15,187 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 340 [2020-07-21 17:36:15,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:36:15,247 INFO L225 Difference]: With dead ends: 36085 [2020-07-21 17:36:15,247 INFO L226 Difference]: Without dead ends: 23619 [2020-07-21 17:36:15,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 338 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:15,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23619 states. [2020-07-21 17:36:16,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23619 to 23562. [2020-07-21 17:36:16,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23562 states. [2020-07-21 17:36:16,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23562 states to 23562 states and 39830 transitions. [2020-07-21 17:36:16,130 INFO L78 Accepts]: Start accepts. Automaton has 23562 states and 39830 transitions. Word has length 340 [2020-07-21 17:36:16,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:16,130 INFO L479 AbstractCegarLoop]: Abstraction has 23562 states and 39830 transitions. [2020-07-21 17:36:16,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:36:16,131 INFO L276 IsEmpty]: Start isEmpty. Operand 23562 states and 39830 transitions. [2020-07-21 17:36:16,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 342 [2020-07-21 17:36:16,191 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:16,192 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:36:16,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:16,408 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:16,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:16,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1270878886, now seen corresponding path program 1 times [2020-07-21 17:36:16,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:16,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [731074938] [2020-07-21 17:36:16,410 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:16,796 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:16,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:16,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 1674 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:36:16,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:16,891 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:16,891 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:16,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [731074938] [2020-07-21 17:36:16,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:16,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:36:16,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126565504] [2020-07-21 17:36:16,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:36:16,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:16,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:36:16,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:16,895 INFO L87 Difference]: Start difference. First operand 23562 states and 39830 transitions. Second operand 3 states. [2020-07-21 17:36:18,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:36:18,024 INFO L93 Difference]: Finished difference Result 63802 states and 107654 transitions. [2020-07-21 17:36:18,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:36:18,025 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 341 [2020-07-21 17:36:18,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:36:18,108 INFO L225 Difference]: With dead ends: 63802 [2020-07-21 17:36:18,108 INFO L226 Difference]: Without dead ends: 41480 [2020-07-21 17:36:18,159 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 339 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:18,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41480 states. [2020-07-21 17:36:20,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41480 to 41378. [2020-07-21 17:36:20,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41378 states. [2020-07-21 17:36:20,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41378 states to 41378 states and 69820 transitions. [2020-07-21 17:36:20,570 INFO L78 Accepts]: Start accepts. Automaton has 41378 states and 69820 transitions. Word has length 341 [2020-07-21 17:36:20,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:20,570 INFO L479 AbstractCegarLoop]: Abstraction has 41378 states and 69820 transitions. [2020-07-21 17:36:20,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:36:20,571 INFO L276 IsEmpty]: Start isEmpty. Operand 41378 states and 69820 transitions. [2020-07-21 17:36:20,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 343 [2020-07-21 17:36:20,641 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:20,642 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:36:20,856 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:20,857 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:20,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:20,857 INFO L82 PathProgramCache]: Analyzing trace with hash -1544938920, now seen corresponding path program 1 times [2020-07-21 17:36:20,858 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:20,858 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [55605336] [2020-07-21 17:36:20,858 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:21,220 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:21,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:21,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 1672 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:36:21,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:21,328 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:21,328 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:21,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [55605336] [2020-07-21 17:36:21,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:21,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:36:21,329 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125931118] [2020-07-21 17:36:21,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:36:21,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:21,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:36:21,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:21,331 INFO L87 Difference]: Start difference. First operand 41378 states and 69820 transitions. Second operand 3 states. [2020-07-21 17:36:22,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:36:22,735 INFO L93 Difference]: Finished difference Result 112688 states and 189953 transitions. [2020-07-21 17:36:22,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:36:22,736 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 342 [2020-07-21 17:36:22,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:36:22,854 INFO L225 Difference]: With dead ends: 112688 [2020-07-21 17:36:22,855 INFO L226 Difference]: Without dead ends: 72724 [2020-07-21 17:36:22,913 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 340 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:22,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72724 states. [2020-07-21 17:36:24,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72724 to 72546. [2020-07-21 17:36:24,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72546 states. [2020-07-21 17:36:24,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72546 states to 72546 states and 122271 transitions. [2020-07-21 17:36:24,610 INFO L78 Accepts]: Start accepts. Automaton has 72546 states and 122271 transitions. Word has length 342 [2020-07-21 17:36:24,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:24,610 INFO L479 AbstractCegarLoop]: Abstraction has 72546 states and 122271 transitions. [2020-07-21 17:36:24,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:36:24,611 INFO L276 IsEmpty]: Start isEmpty. Operand 72546 states and 122271 transitions. [2020-07-21 17:36:24,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 344 [2020-07-21 17:36:24,684 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:24,684 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:36:24,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:24,899 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:24,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:24,899 INFO L82 PathProgramCache]: Analyzing trace with hash 2074181148, now seen corresponding path program 1 times [2020-07-21 17:36:24,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:24,900 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1302540534] [2020-07-21 17:36:24,901 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:25,252 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:25,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:25,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 1684 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 17:36:25,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:25,355 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:25,356 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:25,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1302540534] [2020-07-21 17:36:25,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:25,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 17:36:25,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242482639] [2020-07-21 17:36:25,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 17:36:25,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:25,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 17:36:25,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 17:36:25,363 INFO L87 Difference]: Start difference. First operand 72546 states and 122271 transitions. Second operand 4 states. [2020-07-21 17:36:27,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:36:27,423 INFO L93 Difference]: Finished difference Result 99048 states and 166920 transitions. [2020-07-21 17:36:27,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 17:36:27,424 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 343 [2020-07-21 17:36:27,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:36:27,475 INFO L225 Difference]: With dead ends: 99048 [2020-07-21 17:36:27,476 INFO L226 Difference]: Without dead ends: 33462 [2020-07-21 17:36:27,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 340 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 17:36:27,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33462 states. [2020-07-21 17:36:28,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33462 to 32730. [2020-07-21 17:36:28,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32730 states. [2020-07-21 17:36:28,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32730 states to 32730 states and 55249 transitions. [2020-07-21 17:36:28,319 INFO L78 Accepts]: Start accepts. Automaton has 32730 states and 55249 transitions. Word has length 343 [2020-07-21 17:36:28,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:28,320 INFO L479 AbstractCegarLoop]: Abstraction has 32730 states and 55249 transitions. [2020-07-21 17:36:28,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 17:36:28,321 INFO L276 IsEmpty]: Start isEmpty. Operand 32730 states and 55249 transitions. [2020-07-21 17:36:28,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 358 [2020-07-21 17:36:28,342 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:28,342 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:36:28,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:28,557 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:28,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:28,558 INFO L82 PathProgramCache]: Analyzing trace with hash -125223035, now seen corresponding path program 1 times [2020-07-21 17:36:28,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:28,559 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2127876358] [2020-07-21 17:36:28,561 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:28,893 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:28,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:28,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 1691 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:36:28,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:29,219 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:29,219 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:29,220 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2127876358] [2020-07-21 17:36:29,220 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:29,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:36:29,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543058007] [2020-07-21 17:36:29,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:36:29,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:29,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:36:29,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:29,222 INFO L87 Difference]: Start difference. First operand 32730 states and 55249 transitions. Second operand 3 states. [2020-07-21 17:36:30,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:36:30,105 INFO L93 Difference]: Finished difference Result 77359 states and 130447 transitions. [2020-07-21 17:36:30,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:36:30,106 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 357 [2020-07-21 17:36:30,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:36:30,177 INFO L225 Difference]: With dead ends: 77359 [2020-07-21 17:36:30,177 INFO L226 Difference]: Without dead ends: 49258 [2020-07-21 17:36:30,234 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 355 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:30,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49258 states. [2020-07-21 17:36:32,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49258 to 47432. [2020-07-21 17:36:32,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47432 states. [2020-07-21 17:36:32,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47432 states to 47432 states and 79990 transitions. [2020-07-21 17:36:32,781 INFO L78 Accepts]: Start accepts. Automaton has 47432 states and 79990 transitions. Word has length 357 [2020-07-21 17:36:32,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:32,782 INFO L479 AbstractCegarLoop]: Abstraction has 47432 states and 79990 transitions. [2020-07-21 17:36:32,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:36:32,782 INFO L276 IsEmpty]: Start isEmpty. Operand 47432 states and 79990 transitions. [2020-07-21 17:36:32,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 363 [2020-07-21 17:36:32,811 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:32,812 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:36:33,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:33,026 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:33,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:33,026 INFO L82 PathProgramCache]: Analyzing trace with hash -1388739782, now seen corresponding path program 1 times [2020-07-21 17:36:33,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:33,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [9990273] [2020-07-21 17:36:33,027 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:33,379 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:33,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:33,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 1697 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:36:33,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:33,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:33,482 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:33,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [9990273] [2020-07-21 17:36:33,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:33,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:36:33,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936613137] [2020-07-21 17:36:33,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:36:33,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:33,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:36:33,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:33,484 INFO L87 Difference]: Start difference. First operand 47432 states and 79990 transitions. Second operand 3 states. [2020-07-21 17:36:35,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:36:35,058 INFO L93 Difference]: Finished difference Result 113257 states and 190818 transitions. [2020-07-21 17:36:35,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:36:35,058 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 362 [2020-07-21 17:36:35,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:36:35,157 INFO L225 Difference]: With dead ends: 113257 [2020-07-21 17:36:35,158 INFO L226 Difference]: Without dead ends: 71688 [2020-07-21 17:36:35,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 360 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:35,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71688 states. [2020-07-21 17:36:36,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71688 to 69832. [2020-07-21 17:36:36,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69832 states. [2020-07-21 17:36:36,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69832 states to 69832 states and 117658 transitions. [2020-07-21 17:36:36,701 INFO L78 Accepts]: Start accepts. Automaton has 69832 states and 117658 transitions. Word has length 362 [2020-07-21 17:36:36,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:36,701 INFO L479 AbstractCegarLoop]: Abstraction has 69832 states and 117658 transitions. [2020-07-21 17:36:36,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:36:36,701 INFO L276 IsEmpty]: Start isEmpty. Operand 69832 states and 117658 transitions. [2020-07-21 17:36:36,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 365 [2020-07-21 17:36:36,730 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:36,731 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:36:36,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:36,932 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:36,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:36,933 INFO L82 PathProgramCache]: Analyzing trace with hash -2038288736, now seen corresponding path program 1 times [2020-07-21 17:36:36,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:36,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [571235915] [2020-07-21 17:36:36,935 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:37,300 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:37,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:37,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 1705 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 17:36:37,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:37,384 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:37,384 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:37,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [571235915] [2020-07-21 17:36:37,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:37,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 17:36:37,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883864703] [2020-07-21 17:36:37,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 17:36:37,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:37,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 17:36:37,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 17:36:37,387 INFO L87 Difference]: Start difference. First operand 69832 states and 117658 transitions. Second operand 4 states. [2020-07-21 17:36:38,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:36:38,878 INFO L93 Difference]: Finished difference Result 139113 states and 234280 transitions. [2020-07-21 17:36:38,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 17:36:38,878 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 364 [2020-07-21 17:36:38,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:36:38,957 INFO L225 Difference]: With dead ends: 139113 [2020-07-21 17:36:38,957 INFO L226 Difference]: Without dead ends: 69832 [2020-07-21 17:36:39,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 361 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 17:36:39,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69832 states. [2020-07-21 17:36:42,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69832 to 69832. [2020-07-21 17:36:42,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69832 states. [2020-07-21 17:36:42,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69832 states to 69832 states and 117593 transitions. [2020-07-21 17:36:42,575 INFO L78 Accepts]: Start accepts. Automaton has 69832 states and 117593 transitions. Word has length 364 [2020-07-21 17:36:42,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:42,576 INFO L479 AbstractCegarLoop]: Abstraction has 69832 states and 117593 transitions. [2020-07-21 17:36:42,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 17:36:42,576 INFO L276 IsEmpty]: Start isEmpty. Operand 69832 states and 117593 transitions. [2020-07-21 17:36:42,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 429 [2020-07-21 17:36:42,606 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:42,606 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:36:42,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:42,820 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:42,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:42,821 INFO L82 PathProgramCache]: Analyzing trace with hash 1008024699, now seen corresponding path program 1 times [2020-07-21 17:36:42,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:42,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [109797278] [2020-07-21 17:36:42,823 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:43,302 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:43,302 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:43,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 2740 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 17:36:43,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:43,432 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:43,433 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:43,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [109797278] [2020-07-21 17:36:43,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:43,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 17:36:43,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579958698] [2020-07-21 17:36:43,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 17:36:43,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:43,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 17:36:43,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 17:36:43,436 INFO L87 Difference]: Start difference. First operand 69832 states and 117593 transitions. Second operand 4 states. [2020-07-21 17:36:44,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:36:44,237 INFO L93 Difference]: Finished difference Result 105254 states and 177209 transitions. [2020-07-21 17:36:44,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 17:36:44,238 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 428 [2020-07-21 17:36:44,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:36:44,303 INFO L225 Difference]: With dead ends: 105254 [2020-07-21 17:36:44,304 INFO L226 Difference]: Without dead ends: 50952 [2020-07-21 17:36:44,362 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 425 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 17:36:44,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50952 states. [2020-07-21 17:36:45,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50952 to 48147. [2020-07-21 17:36:45,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48147 states. [2020-07-21 17:36:45,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48147 states to 48147 states and 81099 transitions. [2020-07-21 17:36:45,562 INFO L78 Accepts]: Start accepts. Automaton has 48147 states and 81099 transitions. Word has length 428 [2020-07-21 17:36:45,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:45,563 INFO L479 AbstractCegarLoop]: Abstraction has 48147 states and 81099 transitions. [2020-07-21 17:36:45,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 17:36:45,563 INFO L276 IsEmpty]: Start isEmpty. Operand 48147 states and 81099 transitions. [2020-07-21 17:36:45,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 442 [2020-07-21 17:36:45,578 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:45,579 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:36:45,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:45,788 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:45,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:45,789 INFO L82 PathProgramCache]: Analyzing trace with hash 997383586, now seen corresponding path program 1 times [2020-07-21 17:36:45,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:45,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1512288017] [2020-07-21 17:36:45,791 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:46,252 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:46,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:46,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 2739 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:36:46,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:46,426 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:46,426 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:46,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1512288017] [2020-07-21 17:36:46,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:46,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:36:46,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480910172] [2020-07-21 17:36:46,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:36:46,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:46,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:36:46,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:46,428 INFO L87 Difference]: Start difference. First operand 48147 states and 81099 transitions. Second operand 3 states. [2020-07-21 17:36:48,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:36:48,024 INFO L93 Difference]: Finished difference Result 111971 states and 188499 transitions. [2020-07-21 17:36:48,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:36:48,025 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 441 [2020-07-21 17:36:48,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:36:48,097 INFO L225 Difference]: With dead ends: 111971 [2020-07-21 17:36:48,098 INFO L226 Difference]: Without dead ends: 71600 [2020-07-21 17:36:48,134 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 439 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:48,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71600 states. [2020-07-21 17:36:49,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71600 to 68815. [2020-07-21 17:36:49,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68815 states. [2020-07-21 17:36:49,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68815 states to 68815 states and 115850 transitions. [2020-07-21 17:36:49,316 INFO L78 Accepts]: Start accepts. Automaton has 68815 states and 115850 transitions. Word has length 441 [2020-07-21 17:36:49,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:49,317 INFO L479 AbstractCegarLoop]: Abstraction has 68815 states and 115850 transitions. [2020-07-21 17:36:49,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:36:49,317 INFO L276 IsEmpty]: Start isEmpty. Operand 68815 states and 115850 transitions. [2020-07-21 17:36:49,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 443 [2020-07-21 17:36:49,335 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:49,335 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:36:49,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:49,536 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:49,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:49,537 INFO L82 PathProgramCache]: Analyzing trace with hash -40355071, now seen corresponding path program 1 times [2020-07-21 17:36:49,538 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:49,538 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [589131351] [2020-07-21 17:36:49,539 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:49,992 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:49,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:50,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 2739 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:36:50,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:50,115 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:50,115 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:50,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [589131351] [2020-07-21 17:36:50,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:50,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:36:50,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862175711] [2020-07-21 17:36:50,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:36:50,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:50,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:36:50,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:50,117 INFO L87 Difference]: Start difference. First operand 68815 states and 115850 transitions. Second operand 3 states. [2020-07-21 17:36:52,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:36:52,041 INFO L93 Difference]: Finished difference Result 160622 states and 270258 transitions. [2020-07-21 17:36:52,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:36:52,042 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 442 [2020-07-21 17:36:52,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:36:52,175 INFO L225 Difference]: With dead ends: 160622 [2020-07-21 17:36:52,175 INFO L226 Difference]: Without dead ends: 102504 [2020-07-21 17:36:52,242 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 440 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:52,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102504 states. [2020-07-21 17:36:56,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102504 to 98812. [2020-07-21 17:36:56,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98812 states. [2020-07-21 17:36:56,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98812 states to 98812 states and 166259 transitions. [2020-07-21 17:36:56,696 INFO L78 Accepts]: Start accepts. Automaton has 98812 states and 166259 transitions. Word has length 442 [2020-07-21 17:36:56,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:56,697 INFO L479 AbstractCegarLoop]: Abstraction has 98812 states and 166259 transitions. [2020-07-21 17:36:56,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:36:56,697 INFO L276 IsEmpty]: Start isEmpty. Operand 98812 states and 166259 transitions. [2020-07-21 17:36:56,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 444 [2020-07-21 17:36:56,722 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:56,722 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:36:56,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:56,937 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:56,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:56,938 INFO L82 PathProgramCache]: Analyzing trace with hash -2140924343, now seen corresponding path program 1 times [2020-07-21 17:36:56,939 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:56,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1805109033] [2020-07-21 17:36:56,940 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:57,391 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:57,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:57,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 2740 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:36:57,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:57,528 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:57,528 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:57,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1805109033] [2020-07-21 17:36:57,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:57,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:36:57,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907736755] [2020-07-21 17:36:57,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:36:57,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:57,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:36:57,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:57,531 INFO L87 Difference]: Start difference. First operand 98812 states and 166259 transitions. Second operand 3 states. [2020-07-21 17:37:00,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:37:00,283 INFO L93 Difference]: Finished difference Result 230261 states and 387196 transitions. [2020-07-21 17:37:00,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:37:00,283 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 443 [2020-07-21 17:37:00,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:37:00,506 INFO L225 Difference]: With dead ends: 230261 [2020-07-21 17:37:00,506 INFO L226 Difference]: Without dead ends: 147183 [2020-07-21 17:37:00,607 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 441 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:37:00,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147183 states. [2020-07-21 17:37:06,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147183 to 141610. [2020-07-21 17:37:06,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141610 states. [2020-07-21 17:37:06,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141610 states to 141610 states and 238149 transitions. [2020-07-21 17:37:06,727 INFO L78 Accepts]: Start accepts. Automaton has 141610 states and 238149 transitions. Word has length 443 [2020-07-21 17:37:06,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:37:06,728 INFO L479 AbstractCegarLoop]: Abstraction has 141610 states and 238149 transitions. [2020-07-21 17:37:06,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:37:06,728 INFO L276 IsEmpty]: Start isEmpty. Operand 141610 states and 238149 transitions. [2020-07-21 17:37:06,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2020-07-21 17:37:06,758 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:37:06,759 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:37:06,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:37:06,960 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:37:06,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:37:06,961 INFO L82 PathProgramCache]: Analyzing trace with hash 163736225, now seen corresponding path program 1 times [2020-07-21 17:37:06,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:37:06,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1145377129] [2020-07-21 17:37:06,963 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:37:07,429 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:37:07,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:37:07,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 2746 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 17:37:07,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:37:07,602 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:37:07,603 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:37:07,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1145377129] [2020-07-21 17:37:07,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:37:07,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 17:37:07,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135517772] [2020-07-21 17:37:07,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 17:37:07,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:37:07,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 17:37:07,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-21 17:37:07,605 INFO L87 Difference]: Start difference. First operand 141610 states and 238149 transitions. Second operand 5 states. [2020-07-21 17:37:18,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:37:18,458 INFO L93 Difference]: Finished difference Result 468397 states and 787293 transitions. [2020-07-21 17:37:18,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 17:37:18,459 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 444 [2020-07-21 17:37:18,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:37:18,903 INFO L225 Difference]: With dead ends: 468397 [2020-07-21 17:37:18,903 INFO L226 Difference]: Without dead ends: 348008 [2020-07-21 17:37:19,014 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 441 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-21 17:37:19,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348008 states. [2020-07-21 17:37:31,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348008 to 273325. [2020-07-21 17:37:31,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273325 states. [2020-07-21 17:37:31,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273325 states to 273325 states and 459553 transitions. [2020-07-21 17:37:31,439 INFO L78 Accepts]: Start accepts. Automaton has 273325 states and 459553 transitions. Word has length 444 [2020-07-21 17:37:31,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:37:31,439 INFO L479 AbstractCegarLoop]: Abstraction has 273325 states and 459553 transitions. [2020-07-21 17:37:31,439 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 17:37:31,440 INFO L276 IsEmpty]: Start isEmpty. Operand 273325 states and 459553 transitions. [2020-07-21 17:37:31,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2020-07-21 17:37:31,499 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:37:31,499 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:37:31,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:37:31,700 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:37:31,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:37:31,701 INFO L82 PathProgramCache]: Analyzing trace with hash 414384973, now seen corresponding path program 1 times [2020-07-21 17:37:31,701 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:37:31,702 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1918303360] [2020-07-21 17:37:31,702 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:37:32,161 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:37:32,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:37:32,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 2746 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 17:37:32,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:37:32,302 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:37:32,302 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:37:32,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1918303360] [2020-07-21 17:37:32,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:37:32,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 17:37:32,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435692813] [2020-07-21 17:37:32,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 17:37:32,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:37:32,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 17:37:32,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-21 17:37:32,304 INFO L87 Difference]: Start difference. First operand 273325 states and 459553 transitions. Second operand 5 states. [2020-07-21 17:37:55,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:37:55,738 INFO L93 Difference]: Finished difference Result 911416 states and 1531436 transitions. [2020-07-21 17:37:55,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 17:37:55,739 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 444 [2020-07-21 17:37:55,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:37:56,723 INFO L225 Difference]: With dead ends: 911416 [2020-07-21 17:37:56,724 INFO L226 Difference]: Without dead ends: 679516 [2020-07-21 17:37:56,928 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 447 GetRequests, 442 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-21 17:37:57,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 679516 states. [2020-07-21 17:38:20,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 679516 to 540204. [2020-07-21 17:38:20,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 540204 states. [2020-07-21 17:38:21,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 540204 states to 540204 states and 908455 transitions. [2020-07-21 17:38:21,766 INFO L78 Accepts]: Start accepts. Automaton has 540204 states and 908455 transitions. Word has length 444 [2020-07-21 17:38:21,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:38:21,767 INFO L479 AbstractCegarLoop]: Abstraction has 540204 states and 908455 transitions. [2020-07-21 17:38:21,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 17:38:21,767 INFO L276 IsEmpty]: Start isEmpty. Operand 540204 states and 908455 transitions. [2020-07-21 17:38:21,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2020-07-21 17:38:21,905 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:38:21,905 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:38:22,105 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:38:22,106 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:38:22,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:38:22,107 INFO L82 PathProgramCache]: Analyzing trace with hash -1298356893, now seen corresponding path program 1 times [2020-07-21 17:38:22,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:38:22,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [442343283] [2020-07-21 17:38:22,108 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:38:22,568 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:38:22,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:38:22,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 2746 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 17:38:22,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:38:22,747 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:38:22,747 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:38:22,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [442343283] [2020-07-21 17:38:22,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:38:22,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 17:38:22,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552535712] [2020-07-21 17:38:22,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 17:38:22,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:38:22,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 17:38:22,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-21 17:38:22,749 INFO L87 Difference]: Start difference. First operand 540204 states and 908455 transitions. Second operand 5 states. [2020-07-21 17:39:16,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:39:16,938 INFO L93 Difference]: Finished difference Result 1788190 states and 3004397 transitions. [2020-07-21 17:39:16,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 17:39:16,938 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 444 [2020-07-21 17:39:16,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:39:19,463 INFO L225 Difference]: With dead ends: 1788190 [2020-07-21 17:39:19,463 INFO L226 Difference]: Without dead ends: 1329762 [2020-07-21 17:39:19,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 447 GetRequests, 442 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-21 17:39:20,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1329762 states. [2020-07-21 17:40:30,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1329762 to 1075840. [2020-07-21 17:40:30,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1075840 states. [2020-07-21 17:40:32,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1075840 states to 1075840 states and 1810015 transitions. [2020-07-21 17:40:32,167 INFO L78 Accepts]: Start accepts. Automaton has 1075840 states and 1810015 transitions. Word has length 444 [2020-07-21 17:40:32,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:40:32,167 INFO L479 AbstractCegarLoop]: Abstraction has 1075840 states and 1810015 transitions. [2020-07-21 17:40:32,167 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 17:40:32,167 INFO L276 IsEmpty]: Start isEmpty. Operand 1075840 states and 1810015 transitions. [2020-07-21 17:40:32,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2020-07-21 17:40:32,461 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:40:32,462 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:40:32,662 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:40:32,663 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:40:32,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:40:32,664 INFO L82 PathProgramCache]: Analyzing trace with hash -1503662153, now seen corresponding path program 1 times [2020-07-21 17:40:32,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:40:32,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1672842546] [2020-07-21 17:40:32,665 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:40:34,526 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:40:34,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:40:34,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 2746 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 17:40:34,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:40:34,642 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:40:34,642 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:40:34,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1672842546] [2020-07-21 17:40:34,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:40:34,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 17:40:34,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847950256] [2020-07-21 17:40:34,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 17:40:34,645 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:40:34,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 17:40:34,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 17:40:34,645 INFO L87 Difference]: Start difference. First operand 1075840 states and 1810015 transitions. Second operand 4 states. [2020-07-21 17:41:34,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:41:34,535 INFO L93 Difference]: Finished difference Result 2145600 states and 3609718 transitions. [2020-07-21 17:41:34,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 17:41:34,535 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 444 [2020-07-21 17:41:34,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:41:36,190 INFO L225 Difference]: With dead ends: 2145600 [2020-07-21 17:41:36,190 INFO L226 Difference]: Without dead ends: 1070840 [2020-07-21 17:41:36,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 441 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 17:41:38,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1070840 states.