/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 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 18:29:05,002 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 18:29:05,004 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 18:29:05,017 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 18:29:05,018 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 18:29:05,019 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 18:29:05,020 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 18:29:05,022 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 18:29:05,024 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 18:29:05,025 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 18:29:05,026 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 18:29:05,027 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 18:29:05,027 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 18:29:05,028 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 18:29:05,029 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 18:29:05,031 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 18:29:05,031 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 18:29:05,032 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 18:29:05,034 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 18:29:05,036 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 18:29:05,038 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 18:29:05,039 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 18:29:05,040 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 18:29:05,041 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 18:29:05,043 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 18:29:05,044 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 18:29:05,044 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 18:29:05,045 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 18:29:05,045 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 18:29:05,046 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 18:29:05,047 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 18:29:05,047 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 18:29:05,048 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 18:29:05,049 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 18:29:05,050 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 18:29:05,050 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 18:29:05,051 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 18:29:05,051 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 18:29:05,051 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 18:29:05,052 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 18:29:05,053 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 18:29:05,054 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 18:29:05,076 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 18:29:05,076 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 18:29:05,080 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 18:29:05,081 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 18:29:05,081 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 18:29:05,081 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 18:29:05,082 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 18:29:05,082 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 18:29:05,082 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 18:29:05,082 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 18:29:05,082 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 18:29:05,083 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 18:29:05,083 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 18:29:05,083 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 18:29:05,084 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 18:29:05,085 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 18:29:05,085 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 18:29:05,085 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 18:29:05,085 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 18:29:05,085 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 18:29:05,086 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 18:29:05,086 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 18:29:05,086 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 18:29:05,086 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 18:29:05,087 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 18:29:05,087 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 18:29:05,087 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:05,087 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 18:29:05,088 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 18:29:05,088 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 -> 4 [2020-07-20 18:29:05,373 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 18:29:05,388 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 18:29:05,391 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 18:29:05,393 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 18:29:05,393 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 18:29:05,394 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 18:29:05,472 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4131222e2/ef7dc66b49404e39b773eb351e1b87d9/FLAG2956fbfa8 [2020-07-20 18:29:06,275 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 18:29:06,277 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 18:29:06,304 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4131222e2/ef7dc66b49404e39b773eb351e1b87d9/FLAG2956fbfa8 [2020-07-20 18:29:06,421 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4131222e2/ef7dc66b49404e39b773eb351e1b87d9 [2020-07-20 18:29:06,433 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 18:29:06,436 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 18:29:06,439 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 18:29:06,439 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 18:29:06,443 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 18:29:06,444 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:29:06" (1/1) ... [2020-07-20 18:29:06,447 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e9ca9ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:29:06, skipping insertion in model container [2020-07-20 18:29:06,447 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:29:06" (1/1) ... [2020-07-20 18:29:06,456 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 18:29:06,585 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 18:29:07,658 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 18:29:07,677 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 18:29:08,230 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 18:29:08,272 INFO L208 MainTranslator]: Completed translation [2020-07-20 18:29:08,273 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:29:08 WrapperNode [2020-07-20 18:29:08,273 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 18:29:08,274 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 18:29:08,275 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 18:29:08,276 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 18:29:08,297 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:29:08" (1/1) ... [2020-07-20 18:29:08,300 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:29:08" (1/1) ... [2020-07-20 18:29:08,364 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:29:08" (1/1) ... [2020-07-20 18:29:08,365 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:29:08" (1/1) ... [2020-07-20 18:29:08,457 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:29:08" (1/1) ... [2020-07-20 18:29:08,508 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:29:08" (1/1) ... [2020-07-20 18:29:08,519 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:29:08" (1/1) ... [2020-07-20 18:29:08,530 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 18:29:08,531 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 18:29:08,531 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 18:29:08,531 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 18:29:08,533 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:29:08" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 18:29:08,628 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 18:29:08,629 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 18:29:08,629 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 18:29:08,629 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 18:29:08,630 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 18:29:08,630 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 18:29:08,630 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-07-20 18:29:08,630 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 18:29:08,631 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-20 18:29:08,631 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 18:29:08,631 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 18:29:08,631 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-20 18:29:08,631 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-20 18:29:08,632 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-20 18:29:08,632 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-20 18:29:08,632 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-20 18:29:08,632 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-20 18:29:08,633 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 18:29:08,633 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 18:29:08,633 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 18:29:08,634 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 18:29:08,634 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 18:29:11,294 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 18:29:11,295 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 18:29:11,306 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:29:11 BoogieIcfgContainer [2020-07-20 18:29:11,306 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 18:29:11,307 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 18:29:11,308 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 18:29:11,311 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 18:29:11,311 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 06:29:06" (1/3) ... [2020-07-20 18:29:11,312 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a096174 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:29:11, skipping insertion in model container [2020-07-20 18:29:11,312 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:29:08" (2/3) ... [2020-07-20 18:29:11,313 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a096174 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:29:11, skipping insertion in model container [2020-07-20 18:29:11,313 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:29:11" (3/3) ... [2020-07-20 18:29:11,315 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 18:29:11,326 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 18:29:11,334 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 18:29:11,349 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 18:29:11,376 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 18:29:11,376 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 18:29:11,376 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 18:29:11,376 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 18:29:11,376 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 18:29:11,376 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 18:29:11,376 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 18:29:11,377 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 18:29:11,410 INFO L276 IsEmpty]: Start isEmpty. Operand 808 states. [2020-07-20 18:29:11,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-07-20 18:29:11,436 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:11,438 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] [2020-07-20 18:29:11,438 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:11,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:11,445 INFO L82 PathProgramCache]: Analyzing trace with hash 1078138388, now seen corresponding path program 1 times [2020-07-20 18:29:11,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:11,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [771208320] [2020-07-20 18:29:11,455 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:11,966 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:29:11,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:11,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 1783 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 18:29:11,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:12,217 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:12,217 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:12,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [771208320] [2020-07-20 18:29:12,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:12,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:12,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495501708] [2020-07-20 18:29:12,227 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:12,227 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:12,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:12,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:12,241 INFO L87 Difference]: Start difference. First operand 808 states. Second operand 3 states. [2020-07-20 18:29:12,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:12,654 INFO L93 Difference]: Finished difference Result 1527 states and 2683 transitions. [2020-07-20 18:29:12,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:29:12,656 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 330 [2020-07-20 18:29:12,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:12,706 INFO L225 Difference]: With dead ends: 1527 [2020-07-20 18:29:12,706 INFO L226 Difference]: Without dead ends: 1311 [2020-07-20 18:29:12,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 328 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:12,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1311 states. [2020-07-20 18:29:12,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1311 to 1309. [2020-07-20 18:29:12,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1309 states. [2020-07-20 18:29:12,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1309 states to 1309 states and 2040 transitions. [2020-07-20 18:29:12,867 INFO L78 Accepts]: Start accepts. Automaton has 1309 states and 2040 transitions. Word has length 330 [2020-07-20 18:29:12,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:12,871 INFO L479 AbstractCegarLoop]: Abstraction has 1309 states and 2040 transitions. [2020-07-20 18:29:12,871 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:29:12,872 INFO L276 IsEmpty]: Start isEmpty. Operand 1309 states and 2040 transitions. [2020-07-20 18:29:12,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-07-20 18:29:12,884 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:12,884 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] [2020-07-20 18:29:13,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:13,093 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:13,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:13,094 INFO L82 PathProgramCache]: Analyzing trace with hash 1867298226, now seen corresponding path program 1 times [2020-07-20 18:29:13,094 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:13,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [396016601] [2020-07-20 18:29:13,095 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:13,526 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:29:13,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:13,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 1784 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 18:29:13,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:13,685 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:13,686 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:13,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [396016601] [2020-07-20 18:29:13,686 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:13,686 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:13,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509772575] [2020-07-20 18:29:13,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:13,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:13,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:13,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:13,690 INFO L87 Difference]: Start difference. First operand 1309 states and 2040 transitions. Second operand 3 states. [2020-07-20 18:29:13,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:13,900 INFO L93 Difference]: Finished difference Result 2683 states and 4213 transitions. [2020-07-20 18:29:13,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:29:13,900 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 330 [2020-07-20 18:29:13,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:13,916 INFO L225 Difference]: With dead ends: 2683 [2020-07-20 18:29:13,917 INFO L226 Difference]: Without dead ends: 2301 [2020-07-20 18:29:13,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 328 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:13,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2301 states. [2020-07-20 18:29:14,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2301 to 2299. [2020-07-20 18:29:14,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2299 states. [2020-07-20 18:29:14,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2299 states to 2299 states and 3576 transitions. [2020-07-20 18:29:14,076 INFO L78 Accepts]: Start accepts. Automaton has 2299 states and 3576 transitions. Word has length 330 [2020-07-20 18:29:14,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:14,086 INFO L479 AbstractCegarLoop]: Abstraction has 2299 states and 3576 transitions. [2020-07-20 18:29:14,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:29:14,087 INFO L276 IsEmpty]: Start isEmpty. Operand 2299 states and 3576 transitions. [2020-07-20 18:29:14,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-07-20 18:29:14,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:14,103 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] [2020-07-20 18:29:14,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:14,318 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:14,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:14,319 INFO L82 PathProgramCache]: Analyzing trace with hash -1297523319, now seen corresponding path program 1 times [2020-07-20 18:29:14,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:14,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200012130] [2020-07-20 18:29:14,320 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:14,663 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:29:14,663 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:14,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 1785 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 18:29:14,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:14,875 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:14,876 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:14,876 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200012130] [2020-07-20 18:29:14,877 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:14,877 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:14,877 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293535057] [2020-07-20 18:29:14,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:14,879 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:14,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:14,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:14,880 INFO L87 Difference]: Start difference. First operand 2299 states and 3576 transitions. Second operand 3 states. [2020-07-20 18:29:15,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:15,158 INFO L93 Difference]: Finished difference Result 4867 states and 7634 transitions. [2020-07-20 18:29:15,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:29:15,159 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 330 [2020-07-20 18:29:15,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:15,186 INFO L225 Difference]: With dead ends: 4867 [2020-07-20 18:29:15,187 INFO L226 Difference]: Without dead ends: 4201 [2020-07-20 18:29:15,190 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 328 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:15,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4201 states. [2020-07-20 18:29:15,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4201 to 4199. [2020-07-20 18:29:15,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4199 states. [2020-07-20 18:29:15,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4199 states to 4199 states and 6516 transitions. [2020-07-20 18:29:15,399 INFO L78 Accepts]: Start accepts. Automaton has 4199 states and 6516 transitions. Word has length 330 [2020-07-20 18:29:15,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:15,400 INFO L479 AbstractCegarLoop]: Abstraction has 4199 states and 6516 transitions. [2020-07-20 18:29:15,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:29:15,400 INFO L276 IsEmpty]: Start isEmpty. Operand 4199 states and 6516 transitions. [2020-07-20 18:29:15,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-07-20 18:29:15,412 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:15,413 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] [2020-07-20 18:29:15,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:15,626 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:15,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:15,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1852614154, now seen corresponding path program 1 times [2020-07-20 18:29:15,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:15,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1710292371] [2020-07-20 18:29:15,628 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:15,983 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:29:15,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:15,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 1918 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 18:29:16,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:16,269 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:16,269 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:16,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1710292371] [2020-07-20 18:29:16,271 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:16,271 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:29:16,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690996723] [2020-07-20 18:29:16,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:29:16,275 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:16,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:29:16,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:29:16,275 INFO L87 Difference]: Start difference. First operand 4199 states and 6516 transitions. Second operand 4 states. [2020-07-20 18:29:16,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:16,817 INFO L93 Difference]: Finished difference Result 12374 states and 19171 transitions. [2020-07-20 18:29:16,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 18:29:16,818 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 330 [2020-07-20 18:29:16,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:16,876 INFO L225 Difference]: With dead ends: 12374 [2020-07-20 18:29:16,877 INFO L226 Difference]: Without dead ends: 8228 [2020-07-20 18:29:16,890 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 327 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:29:16,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8228 states. [2020-07-20 18:29:17,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8228 to 8226. [2020-07-20 18:29:17,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8226 states. [2020-07-20 18:29:17,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8226 states to 8226 states and 12688 transitions. [2020-07-20 18:29:17,471 INFO L78 Accepts]: Start accepts. Automaton has 8226 states and 12688 transitions. Word has length 330 [2020-07-20 18:29:17,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:17,472 INFO L479 AbstractCegarLoop]: Abstraction has 8226 states and 12688 transitions. [2020-07-20 18:29:17,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 18:29:17,474 INFO L276 IsEmpty]: Start isEmpty. Operand 8226 states and 12688 transitions. [2020-07-20 18:29:17,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-20 18:29:17,496 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:17,496 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] [2020-07-20 18:29:17,709 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:17,710 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:17,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:17,711 INFO L82 PathProgramCache]: Analyzing trace with hash 743148751, now seen corresponding path program 1 times [2020-07-20 18:29:17,712 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:17,712 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1665968237] [2020-07-20 18:29:17,713 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:18,074 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:29:18,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:18,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 1917 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:29:18,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:18,183 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:18,183 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:18,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1665968237] [2020-07-20 18:29:18,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:18,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:18,184 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935059706] [2020-07-20 18:29:18,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:18,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:18,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:18,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:18,186 INFO L87 Difference]: Start difference. First operand 8226 states and 12688 transitions. Second operand 3 states. [2020-07-20 18:29:18,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:18,893 INFO L93 Difference]: Finished difference Result 24144 states and 37148 transitions. [2020-07-20 18:29:18,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:29:18,894 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 332 [2020-07-20 18:29:18,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:18,959 INFO L225 Difference]: With dead ends: 24144 [2020-07-20 18:29:18,959 INFO L226 Difference]: Without dead ends: 16047 [2020-07-20 18:29:18,976 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 [2020-07-20 18:29:18,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16047 states. [2020-07-20 18:29:19,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16047 to 16045. [2020-07-20 18:29:19,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16045 states. [2020-07-20 18:29:19,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16045 states to 16045 states and 24579 transitions. [2020-07-20 18:29:19,568 INFO L78 Accepts]: Start accepts. Automaton has 16045 states and 24579 transitions. Word has length 332 [2020-07-20 18:29:19,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:19,568 INFO L479 AbstractCegarLoop]: Abstraction has 16045 states and 24579 transitions. [2020-07-20 18:29:19,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:29:19,569 INFO L276 IsEmpty]: Start isEmpty. Operand 16045 states and 24579 transitions. [2020-07-20 18:29:19,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-20 18:29:19,600 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:19,600 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] [2020-07-20 18:29:19,814 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:19,815 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:19,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:19,815 INFO L82 PathProgramCache]: Analyzing trace with hash -41667308, now seen corresponding path program 1 times [2020-07-20 18:29:19,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:19,816 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1707549615] [2020-07-20 18:29:19,816 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:20,036 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:29:20,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:20,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 938 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:29:20,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:20,238 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:20,238 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:20,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1707549615] [2020-07-20 18:29:20,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:20,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:20,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173104377] [2020-07-20 18:29:20,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:20,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:20,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:20,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:20,241 INFO L87 Difference]: Start difference. First operand 16045 states and 24579 transitions. Second operand 3 states. [2020-07-20 18:29:20,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:20,839 INFO L93 Difference]: Finished difference Result 47813 states and 73168 transitions. [2020-07-20 18:29:20,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:29:20,840 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 332 [2020-07-20 18:29:20,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:20,929 INFO L225 Difference]: With dead ends: 47813 [2020-07-20 18:29:20,930 INFO L226 Difference]: Without dead ends: 31933 [2020-07-20 18:29:20,978 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 [2020-07-20 18:29:21,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31933 states. [2020-07-20 18:29:22,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31933 to 16067. [2020-07-20 18:29:22,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16067 states. [2020-07-20 18:29:22,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16067 states to 16067 states and 24606 transitions. [2020-07-20 18:29:22,524 INFO L78 Accepts]: Start accepts. Automaton has 16067 states and 24606 transitions. Word has length 332 [2020-07-20 18:29:22,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:22,525 INFO L479 AbstractCegarLoop]: Abstraction has 16067 states and 24606 transitions. [2020-07-20 18:29:22,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:29:22,525 INFO L276 IsEmpty]: Start isEmpty. Operand 16067 states and 24606 transitions. [2020-07-20 18:29:22,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2020-07-20 18:29:22,565 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:22,566 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] [2020-07-20 18:29:22,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:22,780 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:22,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:22,781 INFO L82 PathProgramCache]: Analyzing trace with hash -2133097602, now seen corresponding path program 1 times [2020-07-20 18:29:22,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:22,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1167486133] [2020-07-20 18:29:22,783 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:23,174 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:29:23,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:23,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 1790 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:29:23,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:23,271 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:23,272 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:23,272 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1167486133] [2020-07-20 18:29:23,272 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:23,272 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:23,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517947188] [2020-07-20 18:29:23,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:23,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:23,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:23,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:23,274 INFO L87 Difference]: Start difference. First operand 16067 states and 24606 transitions. Second operand 3 states. [2020-07-20 18:29:23,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:23,992 INFO L93 Difference]: Finished difference Result 47856 states and 73225 transitions. [2020-07-20 18:29:23,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:29:23,992 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 333 [2020-07-20 18:29:23,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:24,068 INFO L225 Difference]: With dead ends: 47856 [2020-07-20 18:29:24,069 INFO L226 Difference]: Without dead ends: 31968 [2020-07-20 18:29:24,109 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:24,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31968 states. [2020-07-20 18:29:24,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31968 to 16096. [2020-07-20 18:29:24,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16096 states. [2020-07-20 18:29:24,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16096 states to 16096 states and 24643 transitions. [2020-07-20 18:29:24,914 INFO L78 Accepts]: Start accepts. Automaton has 16096 states and 24643 transitions. Word has length 333 [2020-07-20 18:29:24,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:24,915 INFO L479 AbstractCegarLoop]: Abstraction has 16096 states and 24643 transitions. [2020-07-20 18:29:24,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:29:24,915 INFO L276 IsEmpty]: Start isEmpty. Operand 16096 states and 24643 transitions. [2020-07-20 18:29:24,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-07-20 18:29:24,945 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:24,946 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] [2020-07-20 18:29:25,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:25,160 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:25,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:25,161 INFO L82 PathProgramCache]: Analyzing trace with hash 2016507530, now seen corresponding path program 1 times [2020-07-20 18:29:25,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:25,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [411823270] [2020-07-20 18:29:25,163 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:25,493 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:29:25,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:25,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 1922 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:29:25,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:25,621 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:25,622 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:25,622 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [411823270] [2020-07-20 18:29:25,622 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:25,623 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:25,623 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844165523] [2020-07-20 18:29:25,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:25,624 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:25,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:25,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:25,624 INFO L87 Difference]: Start difference. First operand 16096 states and 24643 transitions. Second operand 3 states. [2020-07-20 18:29:27,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:27,317 INFO L93 Difference]: Finished difference Result 45679 states and 69806 transitions. [2020-07-20 18:29:27,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:29:27,317 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 334 [2020-07-20 18:29:27,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:27,368 INFO L225 Difference]: With dead ends: 45679 [2020-07-20 18:29:27,369 INFO L226 Difference]: Without dead ends: 29798 [2020-07-20 18:29:27,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 332 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:27,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29798 states. [2020-07-20 18:29:28,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29798 to 29796. [2020-07-20 18:29:28,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29796 states. [2020-07-20 18:29:28,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29796 states to 29796 states and 45295 transitions. [2020-07-20 18:29:28,282 INFO L78 Accepts]: Start accepts. Automaton has 29796 states and 45295 transitions. Word has length 334 [2020-07-20 18:29:28,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:28,283 INFO L479 AbstractCegarLoop]: Abstraction has 29796 states and 45295 transitions. [2020-07-20 18:29:28,283 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:29:28,283 INFO L276 IsEmpty]: Start isEmpty. Operand 29796 states and 45295 transitions. [2020-07-20 18:29:28,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-07-20 18:29:28,322 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:28,322 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] [2020-07-20 18:29:28,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:28,537 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:28,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:28,538 INFO L82 PathProgramCache]: Analyzing trace with hash 1948498983, now seen corresponding path program 1 times [2020-07-20 18:29:28,539 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:28,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [119852319] [2020-07-20 18:29:28,540 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:28,918 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:29:28,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:28,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 941 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 18:29:28,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:29,011 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:29,011 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:29,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [119852319] [2020-07-20 18:29:29,014 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:29,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:29:29,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877740184] [2020-07-20 18:29:29,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:29:29,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:29,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:29:29,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:29:29,017 INFO L87 Difference]: Start difference. First operand 29796 states and 45295 transitions. Second operand 4 states. [2020-07-20 18:29:29,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:29,709 INFO L93 Difference]: Finished difference Result 60211 states and 91486 transitions. [2020-07-20 18:29:29,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 18:29:29,709 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 334 [2020-07-20 18:29:29,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:29,765 INFO L225 Difference]: With dead ends: 60211 [2020-07-20 18:29:29,765 INFO L226 Difference]: Without dead ends: 30536 [2020-07-20 18:29:29,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:29:29,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30536 states. [2020-07-20 18:29:30,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30536 to 29792. [2020-07-20 18:29:30,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29792 states. [2020-07-20 18:29:30,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29792 states to 29792 states and 45278 transitions. [2020-07-20 18:29:30,943 INFO L78 Accepts]: Start accepts. Automaton has 29792 states and 45278 transitions. Word has length 334 [2020-07-20 18:29:30,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:30,943 INFO L479 AbstractCegarLoop]: Abstraction has 29792 states and 45278 transitions. [2020-07-20 18:29:30,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 18:29:30,943 INFO L276 IsEmpty]: Start isEmpty. Operand 29792 states and 45278 transitions. [2020-07-20 18:29:30,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2020-07-20 18:29:30,964 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:30,965 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] [2020-07-20 18:29:31,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:31,178 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:31,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:31,179 INFO L82 PathProgramCache]: Analyzing trace with hash 1391434938, now seen corresponding path program 1 times [2020-07-20 18:29:31,180 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:31,180 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [303425833] [2020-07-20 18:29:31,181 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:31,402 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:29:31,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:31,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 942 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:29:31,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:31,476 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:31,477 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:31,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [303425833] [2020-07-20 18:29:31,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:31,478 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:31,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663136750] [2020-07-20 18:29:31,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:31,479 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:31,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:31,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:31,480 INFO L87 Difference]: Start difference. First operand 29792 states and 45278 transitions. Second operand 3 states. [2020-07-20 18:29:32,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:32,810 INFO L93 Difference]: Finished difference Result 88990 states and 135177 transitions. [2020-07-20 18:29:32,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:29:32,811 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 336 [2020-07-20 18:29:32,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:32,882 INFO L225 Difference]: With dead ends: 88990 [2020-07-20 18:29:32,883 INFO L226 Difference]: Without dead ends: 59397 [2020-07-20 18:29:32,928 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 334 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:32,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59397 states. [2020-07-20 18:29:35,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59397 to 29818. [2020-07-20 18:29:35,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29818 states. [2020-07-20 18:29:35,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29818 states to 29818 states and 45310 transitions. [2020-07-20 18:29:35,090 INFO L78 Accepts]: Start accepts. Automaton has 29818 states and 45310 transitions. Word has length 336 [2020-07-20 18:29:35,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:35,090 INFO L479 AbstractCegarLoop]: Abstraction has 29818 states and 45310 transitions. [2020-07-20 18:29:35,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:29:35,090 INFO L276 IsEmpty]: Start isEmpty. Operand 29818 states and 45310 transitions. [2020-07-20 18:29:35,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-20 18:29:35,117 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:35,118 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] [2020-07-20 18:29:35,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:35,326 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:35,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:35,327 INFO L82 PathProgramCache]: Analyzing trace with hash 460100053, now seen corresponding path program 1 times [2020-07-20 18:29:35,327 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:35,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [587512696] [2020-07-20 18:29:35,328 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:35,549 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:29:35,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:35,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 944 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 18:29:35,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:35,642 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:35,642 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:35,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [587512696] [2020-07-20 18:29:35,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:35,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:29:35,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092723408] [2020-07-20 18:29:35,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:29:35,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:35,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:29:35,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:29:35,645 INFO L87 Difference]: Start difference. First operand 29818 states and 45310 transitions. Second operand 4 states. [2020-07-20 18:29:37,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:37,279 INFO L93 Difference]: Finished difference Result 86448 states and 131200 transitions. [2020-07-20 18:29:37,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 18:29:37,279 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 337 [2020-07-20 18:29:37,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:37,336 INFO L225 Difference]: With dead ends: 86448 [2020-07-20 18:29:37,336 INFO L226 Difference]: Without dead ends: 57360 [2020-07-20 18:29:37,366 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 334 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:29:37,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57360 states. [2020-07-20 18:29:38,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57360 to 30281. [2020-07-20 18:29:38,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30281 states. [2020-07-20 18:29:38,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30281 states to 30281 states and 46081 transitions. [2020-07-20 18:29:38,782 INFO L78 Accepts]: Start accepts. Automaton has 30281 states and 46081 transitions. Word has length 337 [2020-07-20 18:29:38,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:38,783 INFO L479 AbstractCegarLoop]: Abstraction has 30281 states and 46081 transitions. [2020-07-20 18:29:38,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 18:29:38,783 INFO L276 IsEmpty]: Start isEmpty. Operand 30281 states and 46081 transitions. [2020-07-20 18:29:38,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 340 [2020-07-20 18:29:38,811 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:38,811 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] [2020-07-20 18:29:39,024 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:39,025 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:39,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:39,026 INFO L82 PathProgramCache]: Analyzing trace with hash -164231846, now seen corresponding path program 1 times [2020-07-20 18:29:39,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:39,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1083358104] [2020-07-20 18:29:39,028 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:39,239 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:29:39,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:39,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 956 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 18:29:39,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:39,360 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:39,360 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:39,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1083358104] [2020-07-20 18:29:39,360 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:39,361 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 18:29:39,361 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136010578] [2020-07-20 18:29:39,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 18:29:39,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:39,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 18:29:39,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 18:29:39,362 INFO L87 Difference]: Start difference. First operand 30281 states and 46081 transitions. Second operand 9 states. [2020-07-20 18:29:50,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:50,996 INFO L93 Difference]: Finished difference Result 186955 states and 289268 transitions. [2020-07-20 18:29:50,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 18:29:50,996 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 339 [2020-07-20 18:29:50,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:51,303 INFO L225 Difference]: With dead ends: 186955 [2020-07-20 18:29:51,304 INFO L226 Difference]: Without dead ends: 178713 [2020-07-20 18:29:51,370 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=347, Invalid=985, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 18:29:51,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178713 states. [2020-07-20 18:29:57,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178713 to 80735. [2020-07-20 18:29:57,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80735 states. [2020-07-20 18:29:58,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80735 states to 80735 states and 123281 transitions. [2020-07-20 18:29:58,088 INFO L78 Accepts]: Start accepts. Automaton has 80735 states and 123281 transitions. Word has length 339 [2020-07-20 18:29:58,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:58,089 INFO L479 AbstractCegarLoop]: Abstraction has 80735 states and 123281 transitions. [2020-07-20 18:29:58,089 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 18:29:58,089 INFO L276 IsEmpty]: Start isEmpty. Operand 80735 states and 123281 transitions. [2020-07-20 18:29:58,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 340 [2020-07-20 18:29:58,164 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:58,164 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] [2020-07-20 18:29:58,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:58,380 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:58,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:58,381 INFO L82 PathProgramCache]: Analyzing trace with hash -599446493, now seen corresponding path program 1 times [2020-07-20 18:29:58,381 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:58,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [623661542] [2020-07-20 18:29:58,382 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:58,750 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:29:58,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:58,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 1937 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 18:29:58,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:58,996 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:58,996 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:58,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [623661542] [2020-07-20 18:29:58,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:58,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 18:29:58,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019198682] [2020-07-20 18:29:58,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 18:29:58,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:58,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 18:29:58,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-20 18:29:58,999 INFO L87 Difference]: Start difference. First operand 80735 states and 123281 transitions. Second operand 8 states. [2020-07-20 18:30:04,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:30:04,564 INFO L93 Difference]: Finished difference Result 128353 states and 197249 transitions. [2020-07-20 18:30:04,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 18:30:04,573 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 339 [2020-07-20 18:30:04,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:30:04,687 INFO L225 Difference]: With dead ends: 128353 [2020-07-20 18:30:04,687 INFO L226 Difference]: Without dead ends: 81241 [2020-07-20 18:30:04,735 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 332 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-07-20 18:30:04,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81241 states. [2020-07-20 18:30:07,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81241 to 34895. [2020-07-20 18:30:07,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34895 states. [2020-07-20 18:30:07,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34895 states to 34895 states and 52351 transitions. [2020-07-20 18:30:07,125 INFO L78 Accepts]: Start accepts. Automaton has 34895 states and 52351 transitions. Word has length 339 [2020-07-20 18:30:07,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:30:07,126 INFO L479 AbstractCegarLoop]: Abstraction has 34895 states and 52351 transitions. [2020-07-20 18:30:07,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 18:30:07,126 INFO L276 IsEmpty]: Start isEmpty. Operand 34895 states and 52351 transitions. [2020-07-20 18:30:07,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 340 [2020-07-20 18:30:07,149 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:30:07,150 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] [2020-07-20 18:30:07,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:07,351 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:30:07,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:30:07,351 INFO L82 PathProgramCache]: Analyzing trace with hash 797997647, now seen corresponding path program 1 times [2020-07-20 18:30:07,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:30:07,352 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1693337495] [2020-07-20 18:30:07,352 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:07,691 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:30:07,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:30:07,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 1934 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:30:07,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:30:07,775 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:30:07,775 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:30:07,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1693337495] [2020-07-20 18:30:07,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:30:07,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:30:07,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774915357] [2020-07-20 18:30:07,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:30:07,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:30:07,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:30:07,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:30:07,777 INFO L87 Difference]: Start difference. First operand 34895 states and 52351 transitions. Second operand 3 states. [2020-07-20 18:30:11,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:30:11,851 INFO L93 Difference]: Finished difference Result 104152 states and 156157 transitions. [2020-07-20 18:30:11,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:30:11,852 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 339 [2020-07-20 18:30:11,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:30:11,926 INFO L225 Difference]: With dead ends: 104152 [2020-07-20 18:30:11,926 INFO L226 Difference]: Without dead ends: 69427 [2020-07-20 18:30:11,963 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 [2020-07-20 18:30:12,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69427 states. [2020-07-20 18:30:14,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69427 to 34926. [2020-07-20 18:30:14,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34926 states. [2020-07-20 18:30:14,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34926 states to 34926 states and 52389 transitions. [2020-07-20 18:30:14,057 INFO L78 Accepts]: Start accepts. Automaton has 34926 states and 52389 transitions. Word has length 339 [2020-07-20 18:30:14,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:30:14,058 INFO L479 AbstractCegarLoop]: Abstraction has 34926 states and 52389 transitions. [2020-07-20 18:30:14,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:30:14,058 INFO L276 IsEmpty]: Start isEmpty. Operand 34926 states and 52389 transitions. [2020-07-20 18:30:14,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2020-07-20 18:30:14,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:30:14,079 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] [2020-07-20 18:30:14,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:14,280 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:30:14,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:30:14,281 INFO L82 PathProgramCache]: Analyzing trace with hash -1586632427, now seen corresponding path program 1 times [2020-07-20 18:30:14,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:30:14,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2054822071] [2020-07-20 18:30:14,282 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:14,627 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:30:14,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:30:14,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 1936 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 18:30:14,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:30:14,817 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:30:14,817 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:30:14,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2054822071] [2020-07-20 18:30:14,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:30:14,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 18:30:14,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403304212] [2020-07-20 18:30:14,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 18:30:14,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:30:14,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 18:30:14,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-20 18:30:14,819 INFO L87 Difference]: Start difference. First operand 34926 states and 52389 transitions. Second operand 8 states. [2020-07-20 18:30:21,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:30:21,705 INFO L93 Difference]: Finished difference Result 94392 states and 144435 transitions. [2020-07-20 18:30:21,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 18:30:21,706 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 340 [2020-07-20 18:30:21,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:30:21,798 INFO L225 Difference]: With dead ends: 94392 [2020-07-20 18:30:21,798 INFO L226 Difference]: Without dead ends: 82304 [2020-07-20 18:30:21,822 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-07-20 18:30:21,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82304 states. [2020-07-20 18:30:25,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82304 to 50360. [2020-07-20 18:30:25,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50360 states. [2020-07-20 18:30:25,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50360 states to 50360 states and 75783 transitions. [2020-07-20 18:30:25,199 INFO L78 Accepts]: Start accepts. Automaton has 50360 states and 75783 transitions. Word has length 340 [2020-07-20 18:30:25,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:30:25,199 INFO L479 AbstractCegarLoop]: Abstraction has 50360 states and 75783 transitions. [2020-07-20 18:30:25,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 18:30:25,200 INFO L276 IsEmpty]: Start isEmpty. Operand 50360 states and 75783 transitions. [2020-07-20 18:30:25,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2020-07-20 18:30:25,229 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:30:25,230 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] [2020-07-20 18:30:25,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:25,431 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:30:25,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:30:25,432 INFO L82 PathProgramCache]: Analyzing trace with hash 1672466475, now seen corresponding path program 1 times [2020-07-20 18:30:25,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:30:25,433 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2113589299] [2020-07-20 18:30:25,433 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:25,787 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:30:25,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:30:25,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 1933 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:30:25,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:30:25,864 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:30:25,864 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:30:25,868 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2113589299] [2020-07-20 18:30:25,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:30:25,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:30:25,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739947701] [2020-07-20 18:30:25,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:30:25,871 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:30:25,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:30:25,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:30:25,872 INFO L87 Difference]: Start difference. First operand 50360 states and 75783 transitions. Second operand 3 states. [2020-07-20 18:30:31,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:30:31,801 INFO L93 Difference]: Finished difference Result 118988 states and 179587 transitions. [2020-07-20 18:30:31,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:30:31,802 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 340 [2020-07-20 18:30:31,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:30:31,877 INFO L225 Difference]: With dead ends: 118988 [2020-07-20 18:30:31,878 INFO L226 Difference]: Without dead ends: 70592 [2020-07-20 18:30:31,914 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 [2020-07-20 18:30:31,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70592 states. [2020-07-20 18:30:35,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70592 to 58330. [2020-07-20 18:30:35,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58330 states. [2020-07-20 18:30:35,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58330 states to 58330 states and 88375 transitions. [2020-07-20 18:30:35,819 INFO L78 Accepts]: Start accepts. Automaton has 58330 states and 88375 transitions. Word has length 340 [2020-07-20 18:30:35,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:30:35,820 INFO L479 AbstractCegarLoop]: Abstraction has 58330 states and 88375 transitions. [2020-07-20 18:30:35,820 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:30:35,820 INFO L276 IsEmpty]: Start isEmpty. Operand 58330 states and 88375 transitions. [2020-07-20 18:30:36,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2020-07-20 18:30:36,092 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:30:36,093 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] [2020-07-20 18:30:36,293 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:36,294 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:30:36,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:30:36,295 INFO L82 PathProgramCache]: Analyzing trace with hash -1657930489, now seen corresponding path program 1 times [2020-07-20 18:30:36,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:30:36,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [233283624] [2020-07-20 18:30:36,296 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:36,651 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:30:36,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:30:36,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 1933 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:30:36,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:30:36,741 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:30:36,741 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:30:36,742 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [233283624] [2020-07-20 18:30:36,742 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:30:36,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:30:36,742 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837241410] [2020-07-20 18:30:36,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:30:36,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:30:36,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:30:36,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:30:36,744 INFO L87 Difference]: Start difference. First operand 58330 states and 88375 transitions. Second operand 3 states. [2020-07-20 18:30:44,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:30:44,278 INFO L93 Difference]: Finished difference Result 142122 states and 216379 transitions. [2020-07-20 18:30:44,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:30:44,279 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 340 [2020-07-20 18:30:44,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:30:44,381 INFO L225 Difference]: With dead ends: 142122 [2020-07-20 18:30:44,381 INFO L226 Difference]: Without dead ends: 86192 [2020-07-20 18:30:44,433 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 [2020-07-20 18:30:44,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86192 states. [2020-07-20 18:30:49,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86192 to 76598. [2020-07-20 18:30:49,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76598 states. [2020-07-20 18:30:49,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76598 states to 76598 states and 117345 transitions. [2020-07-20 18:30:49,857 INFO L78 Accepts]: Start accepts. Automaton has 76598 states and 117345 transitions. Word has length 340 [2020-07-20 18:30:49,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:30:49,858 INFO L479 AbstractCegarLoop]: Abstraction has 76598 states and 117345 transitions. [2020-07-20 18:30:49,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:30:49,858 INFO L276 IsEmpty]: Start isEmpty. Operand 76598 states and 117345 transitions. [2020-07-20 18:30:49,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2020-07-20 18:30:49,886 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:30:49,887 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] [2020-07-20 18:30:50,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:50,088 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:30:50,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:30:50,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1443025596, now seen corresponding path program 1 times [2020-07-20 18:30:50,089 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:30:50,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1812709314] [2020-07-20 18:30:50,090 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:50,314 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:30:50,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:30:50,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 945 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:30:50,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:30:50,391 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:30:50,391 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:30:50,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1812709314] [2020-07-20 18:30:50,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:30:50,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:30:50,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277282771] [2020-07-20 18:30:50,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:30:50,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:30:50,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:30:50,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:30:50,393 INFO L87 Difference]: Start difference. First operand 76598 states and 117345 transitions. Second operand 3 states. [2020-07-20 18:31:02,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:31:02,880 INFO L93 Difference]: Finished difference Result 227308 states and 347874 transitions. [2020-07-20 18:31:02,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:31:02,880 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 340 [2020-07-20 18:31:02,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:31:03,065 INFO L225 Difference]: With dead ends: 227308 [2020-07-20 18:31:03,066 INFO L226 Difference]: Without dead ends: 151957 [2020-07-20 18:31:03,129 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 [2020-07-20 18:31:03,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151957 states. [2020-07-20 18:31:09,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151957 to 76703. [2020-07-20 18:31:09,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76703 states. [2020-07-20 18:31:09,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76703 states to 76703 states and 117479 transitions. [2020-07-20 18:31:09,326 INFO L78 Accepts]: Start accepts. Automaton has 76703 states and 117479 transitions. Word has length 340 [2020-07-20 18:31:09,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:31:09,327 INFO L479 AbstractCegarLoop]: Abstraction has 76703 states and 117479 transitions. [2020-07-20 18:31:09,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:31:09,327 INFO L276 IsEmpty]: Start isEmpty. Operand 76703 states and 117479 transitions. [2020-07-20 18:31:09,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2020-07-20 18:31:09,355 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:31:09,355 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] [2020-07-20 18:31:09,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:31:09,556 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:31:09,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:31:09,557 INFO L82 PathProgramCache]: Analyzing trace with hash -918932206, now seen corresponding path program 1 times [2020-07-20 18:31:09,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:31:09,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1071906208] [2020-07-20 18:31:09,558 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:31:09,906 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:31:09,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:31:09,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 1933 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:31:09,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:31:09,994 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:31:09,995 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:31:09,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1071906208] [2020-07-20 18:31:09,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:31:09,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:31:09,995 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304069556] [2020-07-20 18:31:09,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:31:09,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:31:09,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:31:09,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:31:09,996 INFO L87 Difference]: Start difference. First operand 76703 states and 117479 transitions. Second operand 3 states. [2020-07-20 18:31:22,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:31:22,603 INFO L93 Difference]: Finished difference Result 206411 states and 317615 transitions. [2020-07-20 18:31:22,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:31:22,604 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 340 [2020-07-20 18:31:22,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:31:22,782 INFO L225 Difference]: With dead ends: 206411 [2020-07-20 18:31:22,782 INFO L226 Difference]: Without dead ends: 132065 [2020-07-20 18:31:22,849 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 [2020-07-20 18:31:22,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132065 states. [2020-07-20 18:31:31,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132065 to 115087. [2020-07-20 18:31:31,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115087 states. [2020-07-20 18:31:32,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115087 states to 115087 states and 178227 transitions. [2020-07-20 18:31:32,189 INFO L78 Accepts]: Start accepts. Automaton has 115087 states and 178227 transitions. Word has length 340 [2020-07-20 18:31:32,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:31:32,190 INFO L479 AbstractCegarLoop]: Abstraction has 115087 states and 178227 transitions. [2020-07-20 18:31:32,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:31:32,190 INFO L276 IsEmpty]: Start isEmpty. Operand 115087 states and 178227 transitions. [2020-07-20 18:31:32,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 342 [2020-07-20 18:31:32,219 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:31:32,219 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] [2020-07-20 18:31:32,426 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:31:32,427 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:31:32,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:31:32,428 INFO L82 PathProgramCache]: Analyzing trace with hash -613272991, now seen corresponding path program 1 times [2020-07-20 18:31:32,428 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:31:32,428 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513106494] [2020-07-20 18:31:32,428 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:31:32,760 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:31:32,761 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:31:32,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 1798 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 18:31:32,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:31:32,820 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:31:32,821 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:31:32,821 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513106494] [2020-07-20 18:31:32,821 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:31:32,821 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:31:32,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469362680] [2020-07-20 18:31:32,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:31:32,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:31:32,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:31:32,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:31:32,822 INFO L87 Difference]: Start difference. First operand 115087 states and 178227 transitions. Second operand 4 states. [2020-07-20 18:31:53,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:31:53,773 INFO L93 Difference]: Finished difference Result 338163 states and 523346 transitions. [2020-07-20 18:31:53,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 18:31:53,774 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 341 [2020-07-20 18:31:53,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:31:54,078 INFO L225 Difference]: With dead ends: 338163 [2020-07-20 18:31:54,079 INFO L226 Difference]: Without dead ends: 224549 [2020-07-20 18:31:54,167 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 338 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:31:54,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224549 states. [2020-07-20 18:32:05,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224549 to 115786. [2020-07-20 18:32:05,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115786 states. [2020-07-20 18:32:05,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115786 states to 115786 states and 179401 transitions. [2020-07-20 18:32:05,393 INFO L78 Accepts]: Start accepts. Automaton has 115786 states and 179401 transitions. Word has length 341 [2020-07-20 18:32:05,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:32:05,393 INFO L479 AbstractCegarLoop]: Abstraction has 115786 states and 179401 transitions. [2020-07-20 18:32:05,393 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 18:32:05,393 INFO L276 IsEmpty]: Start isEmpty. Operand 115786 states and 179401 transitions. [2020-07-20 18:32:05,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 344 [2020-07-20 18:32:05,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:32:05,423 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] [2020-07-20 18:32:05,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:32:05,624 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:32:05,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:32:05,624 INFO L82 PathProgramCache]: Analyzing trace with hash 582123950, now seen corresponding path program 1 times [2020-07-20 18:32:05,625 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:32:05,625 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [555887621] [2020-07-20 18:32:05,625 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:32:05,972 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:32:05,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:32:05,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 1941 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 18:32:05,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:32:06,188 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:32:06,189 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:32:06,189 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [555887621] [2020-07-20 18:32:06,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:32:06,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 18:32:06,189 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372934333] [2020-07-20 18:32:06,190 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 18:32:06,190 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:32:06,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 18:32:06,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:32:06,191 INFO L87 Difference]: Start difference. First operand 115786 states and 179401 transitions. Second operand 5 states. [2020-07-20 18:32:28,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:32:28,347 INFO L93 Difference]: Finished difference Result 309814 states and 484219 transitions. [2020-07-20 18:32:28,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 18:32:28,347 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 343 [2020-07-20 18:32:28,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:32:28,663 INFO L225 Difference]: With dead ends: 309814 [2020-07-20 18:32:28,663 INFO L226 Difference]: Without dead ends: 225472 [2020-07-20 18:32:28,757 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 339 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-20 18:32:28,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225472 states. [2020-07-20 18:32:52,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225472 to 225470. [2020-07-20 18:32:52,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225470 states. [2020-07-20 18:32:52,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225470 states to 225470 states and 349218 transitions. [2020-07-20 18:32:52,809 INFO L78 Accepts]: Start accepts. Automaton has 225470 states and 349218 transitions. Word has length 343 [2020-07-20 18:32:52,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:32:52,810 INFO L479 AbstractCegarLoop]: Abstraction has 225470 states and 349218 transitions. [2020-07-20 18:32:52,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 18:32:52,810 INFO L276 IsEmpty]: Start isEmpty. Operand 225470 states and 349218 transitions. [2020-07-20 18:32:52,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 344 [2020-07-20 18:32:52,870 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:32:52,870 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] [2020-07-20 18:32:53,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:32:53,071 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:32:53,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:32:53,072 INFO L82 PathProgramCache]: Analyzing trace with hash 901932915, now seen corresponding path program 1 times [2020-07-20 18:32:53,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:32:53,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1949216432] [2020-07-20 18:32:53,073 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:32:53,426 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:32:53,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:32:53,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 1942 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 18:32:53,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:32:53,537 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:32:53,538 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:32:53,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1949216432] [2020-07-20 18:32:53,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:32:53,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:32:53,538 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033824905] [2020-07-20 18:32:53,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:32:53,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:32:53,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:32:53,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:32:53,540 INFO L87 Difference]: Start difference. First operand 225470 states and 349218 transitions. Second operand 4 states. [2020-07-20 18:33:42,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:33:42,340 INFO L93 Difference]: Finished difference Result 667013 states and 1033055 transitions. [2020-07-20 18:33:42,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 18:33:42,341 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 343 [2020-07-20 18:33:42,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:33:43,022 INFO L225 Difference]: With dead ends: 667013 [2020-07-20 18:33:43,022 INFO L226 Difference]: Without dead ends: 441626 [2020-07-20 18:33:43,246 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 [2020-07-20 18:33:43,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441626 states. [2020-07-20 18:34:31,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441626 to 441586. [2020-07-20 18:34:31,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 441586 states. [2020-07-20 18:34:32,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441586 states to 441586 states and 681024 transitions. [2020-07-20 18:34:32,276 INFO L78 Accepts]: Start accepts. Automaton has 441586 states and 681024 transitions. Word has length 343 [2020-07-20 18:34:32,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:34:32,277 INFO L479 AbstractCegarLoop]: Abstraction has 441586 states and 681024 transitions. [2020-07-20 18:34:32,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 18:34:32,277 INFO L276 IsEmpty]: Start isEmpty. Operand 441586 states and 681024 transitions. [2020-07-20 18:34:32,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2020-07-20 18:34:32,403 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:34:32,403 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] [2020-07-20 18:34:32,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:34:32,604 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:34:32,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:34:32,605 INFO L82 PathProgramCache]: Analyzing trace with hash -1066844016, now seen corresponding path program 1 times [2020-07-20 18:34:32,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:34:32,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [935508074] [2020-07-20 18:34:32,606 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:34:33,732 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:34:33,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:34:33,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 1799 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:34:33,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:34:33,815 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:34:33,815 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:34:33,815 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [935508074] [2020-07-20 18:34:33,815 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:34:33,816 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:34:33,816 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083249564] [2020-07-20 18:34:33,816 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:34:33,816 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:34:33,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:34:33,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:34:33,817 INFO L87 Difference]: Start difference. First operand 441586 states and 681024 transitions. Second operand 3 states. [2020-07-20 18:36:10,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:36:10,605 INFO L93 Difference]: Finished difference Result 1316990 states and 2030242 transitions. [2020-07-20 18:36:10,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:36:10,605 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 344 [2020-07-20 18:36:10,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:36:12,038 INFO L225 Difference]: With dead ends: 1316990 [2020-07-20 18:36:12,039 INFO L226 Difference]: Without dead ends: 879296 [2020-07-20 18:36:12,392 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:36:13,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 879296 states. [2020-07-20 18:37:11,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 879296 to 441789. [2020-07-20 18:37:11,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 441789 states. [2020-07-20 18:37:12,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441789 states to 441789 states and 681282 transitions. [2020-07-20 18:37:12,179 INFO L78 Accepts]: Start accepts. Automaton has 441789 states and 681282 transitions. Word has length 344 [2020-07-20 18:37:12,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:37:12,179 INFO L479 AbstractCegarLoop]: Abstraction has 441789 states and 681282 transitions. [2020-07-20 18:37:12,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:37:12,179 INFO L276 IsEmpty]: Start isEmpty. Operand 441789 states and 681282 transitions. [2020-07-20 18:37:12,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2020-07-20 18:37:12,318 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:37:12,319 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] [2020-07-20 18:37:12,519 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:37:12,519 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:37:12,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:37:12,520 INFO L82 PathProgramCache]: Analyzing trace with hash -1923341071, now seen corresponding path program 1 times [2020-07-20 18:37:12,521 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:37:12,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [810132019] [2020-07-20 18:37:12,522 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:37:12,862 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:37:12,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:37:12,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 1946 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:37:12,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:37:12,962 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:37:12,962 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:37:12,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [810132019] [2020-07-20 18:37:12,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:37:12,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:37:12,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355523383] [2020-07-20 18:37:12,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:37:12,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:37:12,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:37:12,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:37:12,964 INFO L87 Difference]: Start difference. First operand 441789 states and 681282 transitions. Second operand 3 states. [2020-07-20 18:38:52,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:38:52,999 INFO L93 Difference]: Finished difference Result 1303341 states and 2010094 transitions. [2020-07-20 18:38:53,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:38:53,000 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 345 [2020-07-20 18:38:53,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:38:54,413 INFO L225 Difference]: With dead ends: 1303341 [2020-07-20 18:38:54,413 INFO L226 Difference]: Without dead ends: 862613 [2020-07-20 18:38:54,734 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 343 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:38:55,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 862613 states. [2020-07-20 18:40:45,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 862613 to 862598. [2020-07-20 18:40:45,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 862598 states. [2020-07-20 18:40:47,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 862598 states to 862598 states and 1324859 transitions. [2020-07-20 18:40:47,835 INFO L78 Accepts]: Start accepts. Automaton has 862598 states and 1324859 transitions. Word has length 345 [2020-07-20 18:40:47,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:40:47,835 INFO L479 AbstractCegarLoop]: Abstraction has 862598 states and 1324859 transitions. [2020-07-20 18:40:47,835 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:40:47,835 INFO L276 IsEmpty]: Start isEmpty. Operand 862598 states and 1324859 transitions. [2020-07-20 18:40:48,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2020-07-20 18:40:48,074 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:40:48,075 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] [2020-07-20 18:40:48,283 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:40:48,284 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:40:48,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:40:48,285 INFO L82 PathProgramCache]: Analyzing trace with hash -1385034310, now seen corresponding path program 1 times [2020-07-20 18:40:48,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:40:48,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [784043987] [2020-07-20 18:40:48,286 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:40:48,579 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:40:48,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:40:48,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 1510 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 18:40:48,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:40:48,661 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:40:48,661 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:40:48,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [784043987] [2020-07-20 18:40:48,661 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:40:48,662 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:40:48,662 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308038703] [2020-07-20 18:40:48,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:40:48,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:40:48,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:40:48,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:40:48,663 INFO L87 Difference]: Start difference. First operand 862598 states and 1324859 transitions. Second operand 4 states.