/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 DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.4.ufo.BOUNDED-10.pals.c.p+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 21:03:43,475 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 21:03:43,477 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 21:03:43,490 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 21:03:43,490 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 21:03:43,491 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 21:03:43,493 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 21:03:43,494 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 21:03:43,496 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 21:03:43,497 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 21:03:43,498 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 21:03:43,499 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 21:03:43,499 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 21:03:43,500 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 21:03:43,501 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 21:03:43,503 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 21:03:43,503 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 21:03:43,504 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 21:03:43,506 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 21:03:43,508 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 21:03:43,509 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 21:03:43,510 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 21:03:43,511 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 21:03:43,512 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 21:03:43,514 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 21:03:43,515 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 21:03:43,515 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 21:03:43,516 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 21:03:43,516 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 21:03:43,517 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 21:03:43,517 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 21:03:43,518 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 21:03:43,519 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 21:03:43,520 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 21:03:43,521 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 21:03:43,521 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 21:03:43,522 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 21:03:43,522 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 21:03:43,522 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 21:03:43,523 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 21:03:43,523 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 21:03:43,524 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 21:03:43,539 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 21:03:43,539 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 21:03:43,540 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 21:03:43,540 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 21:03:43,541 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 21:03:43,541 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 21:03:43,541 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 21:03:43,541 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 21:03:43,542 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 21:03:43,542 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 21:03:43,542 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 21:03:43,542 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 21:03:43,542 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 21:03:43,543 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 21:03:43,543 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 21:03:43,543 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 21:03:43,543 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 21:03:43,543 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 21:03:43,544 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 21:03:43,544 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 21:03:43,544 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 21:03:43,544 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 21:03:43,544 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 21:03:43,545 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 21:03:43,545 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 21:03:43,545 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 21:03:43,545 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:03:43,545 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 21:03:43,546 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 21:03:43,546 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 -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 21:03:43,851 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 21:03:43,865 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 21:03:43,868 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 21:03:43,870 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 21:03:43,870 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 21:03:43,871 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.4.ufo.BOUNDED-10.pals.c.p+lhb-reducer.c [2020-07-21 21:03:43,935 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/336cac33a/aecb85cecf39455db1c98d88fe6b49be/FLAG2c6cdbb36 [2020-07-21 21:03:44,717 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 21:03:44,718 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.4.ufo.BOUNDED-10.pals.c.p+lhb-reducer.c [2020-07-21 21:03:44,762 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/336cac33a/aecb85cecf39455db1c98d88fe6b49be/FLAG2c6cdbb36 [2020-07-21 21:03:45,263 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/336cac33a/aecb85cecf39455db1c98d88fe6b49be [2020-07-21 21:03:45,274 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 21:03:45,277 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 21:03:45,278 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 21:03:45,278 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 21:03:45,282 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 21:03:45,283 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 09:03:45" (1/1) ... [2020-07-21 21:03:45,286 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3b09a4f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:03:45, skipping insertion in model container [2020-07-21 21:03:45,286 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 09:03:45" (1/1) ... [2020-07-21 21:03:45,294 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 21:03:45,526 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 21:03:47,869 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 21:03:47,882 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 21:03:49,669 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 21:03:49,711 INFO L208 MainTranslator]: Completed translation [2020-07-21 21:03:49,711 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:03:49 WrapperNode [2020-07-21 21:03:49,711 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 21:03:49,712 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 21:03:49,712 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 21:03:49,713 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 21:03:49,730 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:03:49" (1/1) ... [2020-07-21 21:03:49,732 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:03:49" (1/1) ... [2020-07-21 21:03:49,812 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:03:49" (1/1) ... [2020-07-21 21:03:49,815 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:03:49" (1/1) ... [2020-07-21 21:03:49,921 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:03:49" (1/1) ... [2020-07-21 21:03:49,979 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:03:49" (1/1) ... [2020-07-21 21:03:50,002 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:03:49" (1/1) ... [2020-07-21 21:03:50,034 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 21:03:50,035 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 21:03:50,035 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 21:03:50,036 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 21:03:50,037 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:03:49" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 21:03:50,128 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 21:03:50,129 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 21:03:50,129 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 21:03:50,129 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 21:03:50,129 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 21:03:50,130 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 21:03:50,130 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 21:03:50,130 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-21 21:03:50,130 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 21:03:50,131 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 21:03:50,131 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-21 21:03:50,131 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-21 21:03:50,131 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-21 21:03:50,131 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-21 21:03:50,132 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-21 21:03:50,132 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-21 21:03:50,132 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-21 21:03:50,132 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 21:03:50,133 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-21 21:03:50,133 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 21:03:50,133 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 21:03:50,133 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 21:03:55,829 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 21:03:55,830 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 21:03:55,852 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 09:03:55 BoogieIcfgContainer [2020-07-21 21:03:55,852 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 21:03:55,855 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 21:03:55,856 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 21:03:55,859 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 21:03:55,860 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 09:03:45" (1/3) ... [2020-07-21 21:03:55,861 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55de77d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 09:03:55, skipping insertion in model container [2020-07-21 21:03:55,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:03:49" (2/3) ... [2020-07-21 21:03:55,862 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55de77d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 09:03:55, skipping insertion in model container [2020-07-21 21:03:55,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 09:03:55" (3/3) ... [2020-07-21 21:03:55,865 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.4.ufo.BOUNDED-10.pals.c.p+lhb-reducer.c [2020-07-21 21:03:55,876 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 21:03:55,894 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-07-21 21:03:55,910 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-07-21 21:03:55,949 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 21:03:55,949 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 21:03:55,949 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 21:03:55,949 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 21:03:55,949 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 21:03:55,949 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 21:03:55,949 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 21:03:55,949 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 21:03:56,002 INFO L276 IsEmpty]: Start isEmpty. Operand 2249 states. [2020-07-21 21:03:56,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2020-07-21 21:03:56,041 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:03:56,042 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] [2020-07-21 21:03:56,043 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:03:56,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:03:56,049 INFO L82 PathProgramCache]: Analyzing trace with hash -2040294362, now seen corresponding path program 1 times [2020-07-21 21:03:56,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:03:56,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [926525267] [2020-07-21 21:03:56,060 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:03:56,571 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:03:56,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:03:56,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 1602 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 21:03:56,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:03:56,736 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:03:56,737 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:03:56,738 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [926525267] [2020-07-21 21:03:56,739 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:03:56,739 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:03:56,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689287124] [2020-07-21 21:03:56,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:03:56,746 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:03:56,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:03:56,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:03:56,764 INFO L87 Difference]: Start difference. First operand 2249 states. Second operand 4 states. [2020-07-21 21:03:57,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:03:57,034 INFO L93 Difference]: Finished difference Result 3578 states and 6234 transitions. [2020-07-21 21:03:57,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:03:57,037 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 290 [2020-07-21 21:03:57,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:03:57,070 INFO L225 Difference]: With dead ends: 3578 [2020-07-21 21:03:57,070 INFO L226 Difference]: Without dead ends: 2245 [2020-07-21 21:03:57,082 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 287 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:03:57,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2245 states. [2020-07-21 21:03:57,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2245 to 2245. [2020-07-21 21:03:57,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2245 states. [2020-07-21 21:03:57,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2245 states to 2245 states and 3921 transitions. [2020-07-21 21:03:57,256 INFO L78 Accepts]: Start accepts. Automaton has 2245 states and 3921 transitions. Word has length 290 [2020-07-21 21:03:57,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:03:57,260 INFO L479 AbstractCegarLoop]: Abstraction has 2245 states and 3921 transitions. [2020-07-21 21:03:57,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:03:57,260 INFO L276 IsEmpty]: Start isEmpty. Operand 2245 states and 3921 transitions. [2020-07-21 21:03:57,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 21:03:57,275 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:03:57,276 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] [2020-07-21 21:03:57,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:03:57,493 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:03:57,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:03:57,494 INFO L82 PathProgramCache]: Analyzing trace with hash -694396288, now seen corresponding path program 1 times [2020-07-21 21:03:57,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:03:57,495 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1676232804] [2020-07-21 21:03:57,495 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:03:57,945 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:03:57,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:03:57,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 1610 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:03:57,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:03:58,069 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:03:58,070 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:03:58,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1676232804] [2020-07-21 21:03:58,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:03:58,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:03:58,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296765029] [2020-07-21 21:03:58,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:03:58,074 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:03:58,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:03:58,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:03:58,074 INFO L87 Difference]: Start difference. First operand 2245 states and 3921 transitions. Second operand 3 states. [2020-07-21 21:03:58,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:03:58,529 INFO L93 Difference]: Finished difference Result 4813 states and 8277 transitions. [2020-07-21 21:03:58,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:03:58,530 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 299 [2020-07-21 21:03:58,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:03:58,551 INFO L225 Difference]: With dead ends: 4813 [2020-07-21 21:03:58,551 INFO L226 Difference]: Without dead ends: 3452 [2020-07-21 21:03:58,557 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 297 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:03:58,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3452 states. [2020-07-21 21:03:58,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3452 to 3448. [2020-07-21 21:03:58,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3448 states. [2020-07-21 21:03:58,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3448 states to 3448 states and 5950 transitions. [2020-07-21 21:03:58,680 INFO L78 Accepts]: Start accepts. Automaton has 3448 states and 5950 transitions. Word has length 299 [2020-07-21 21:03:58,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:03:58,681 INFO L479 AbstractCegarLoop]: Abstraction has 3448 states and 5950 transitions. [2020-07-21 21:03:58,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:03:58,682 INFO L276 IsEmpty]: Start isEmpty. Operand 3448 states and 5950 transitions. [2020-07-21 21:03:58,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-21 21:03:58,693 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:03:58,694 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] [2020-07-21 21:03:58,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:03:58,908 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:03:58,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:03:58,909 INFO L82 PathProgramCache]: Analyzing trace with hash -141790480, now seen corresponding path program 1 times [2020-07-21 21:03:58,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:03:58,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [898689436] [2020-07-21 21:03:58,909 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:03:59,317 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:03:59,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:03:59,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 1609 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:03:59,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:03:59,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:03:59,455 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:03:59,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [898689436] [2020-07-21 21:03:59,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:03:59,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:03:59,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846624959] [2020-07-21 21:03:59,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:03:59,457 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:03:59,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:03:59,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:03:59,459 INFO L87 Difference]: Start difference. First operand 3448 states and 5950 transitions. Second operand 3 states. [2020-07-21 21:04:00,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:00,122 INFO L93 Difference]: Finished difference Result 6716 states and 11493 transitions. [2020-07-21 21:04:00,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:04:00,123 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 300 [2020-07-21 21:04:00,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:00,157 INFO L225 Difference]: With dead ends: 6716 [2020-07-21 21:04:00,158 INFO L226 Difference]: Without dead ends: 4564 [2020-07-21 21:04:00,169 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 298 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:00,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4564 states. [2020-07-21 21:04:00,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4564 to 4421. [2020-07-21 21:04:00,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4421 states. [2020-07-21 21:04:00,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4421 states to 4421 states and 7595 transitions. [2020-07-21 21:04:00,431 INFO L78 Accepts]: Start accepts. Automaton has 4421 states and 7595 transitions. Word has length 300 [2020-07-21 21:04:00,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:00,432 INFO L479 AbstractCegarLoop]: Abstraction has 4421 states and 7595 transitions. [2020-07-21 21:04:00,432 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:04:00,432 INFO L276 IsEmpty]: Start isEmpty. Operand 4421 states and 7595 transitions. [2020-07-21 21:04:00,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2020-07-21 21:04:00,448 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:00,449 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] [2020-07-21 21:04:00,662 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:00,663 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:00,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:00,664 INFO L82 PathProgramCache]: Analyzing trace with hash 1939673867, now seen corresponding path program 1 times [2020-07-21 21:04:00,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:00,665 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [149845550] [2020-07-21 21:04:00,665 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:01,179 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:01,179 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:01,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 1616 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 21:04:01,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:01,399 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:01,400 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:01,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [149845550] [2020-07-21 21:04:01,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:01,402 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:04:01,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213780206] [2020-07-21 21:04:01,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:04:01,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:01,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:04:01,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:04:01,405 INFO L87 Difference]: Start difference. First operand 4421 states and 7595 transitions. Second operand 4 states. [2020-07-21 21:04:01,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:01,771 INFO L93 Difference]: Finished difference Result 7958 states and 13588 transitions. [2020-07-21 21:04:01,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:04:01,772 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 305 [2020-07-21 21:04:01,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:01,796 INFO L225 Difference]: With dead ends: 7958 [2020-07-21 21:04:01,797 INFO L226 Difference]: Without dead ends: 4271 [2020-07-21 21:04:01,810 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 302 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:04:01,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4271 states. [2020-07-21 21:04:01,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4271 to 4271. [2020-07-21 21:04:01,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4271 states. [2020-07-21 21:04:01,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4271 states to 4271 states and 7331 transitions. [2020-07-21 21:04:01,978 INFO L78 Accepts]: Start accepts. Automaton has 4271 states and 7331 transitions. Word has length 305 [2020-07-21 21:04:01,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:01,978 INFO L479 AbstractCegarLoop]: Abstraction has 4271 states and 7331 transitions. [2020-07-21 21:04:01,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:04:01,979 INFO L276 IsEmpty]: Start isEmpty. Operand 4271 states and 7331 transitions. [2020-07-21 21:04:01,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 314 [2020-07-21 21:04:01,993 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:01,993 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] [2020-07-21 21:04:02,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:02,209 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:02,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:02,210 INFO L82 PathProgramCache]: Analyzing trace with hash -17513046, now seen corresponding path program 1 times [2020-07-21 21:04:02,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:02,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2016112183] [2020-07-21 21:04:02,211 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:02,825 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:02,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:02,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 1626 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 21:04:02,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:02,919 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:02,920 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:02,920 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2016112183] [2020-07-21 21:04:02,920 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:02,920 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:04:02,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666049105] [2020-07-21 21:04:02,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:04:02,923 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:02,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:04:02,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:04:02,924 INFO L87 Difference]: Start difference. First operand 4271 states and 7331 transitions. Second operand 4 states. [2020-07-21 21:04:03,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:03,049 INFO L93 Difference]: Finished difference Result 5110 states and 8752 transitions. [2020-07-21 21:04:03,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:04:03,050 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 313 [2020-07-21 21:04:03,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:03,071 INFO L225 Difference]: With dead ends: 5110 [2020-07-21 21:04:03,072 INFO L226 Difference]: Without dead ends: 4071 [2020-07-21 21:04:03,081 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 310 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:04:03,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4071 states. [2020-07-21 21:04:03,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4071 to 3932. [2020-07-21 21:04:03,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3932 states. [2020-07-21 21:04:03,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3932 states to 3932 states and 6750 transitions. [2020-07-21 21:04:03,241 INFO L78 Accepts]: Start accepts. Automaton has 3932 states and 6750 transitions. Word has length 313 [2020-07-21 21:04:03,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:03,242 INFO L479 AbstractCegarLoop]: Abstraction has 3932 states and 6750 transitions. [2020-07-21 21:04:03,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:04:03,242 INFO L276 IsEmpty]: Start isEmpty. Operand 3932 states and 6750 transitions. [2020-07-21 21:04:03,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-21 21:04:03,262 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:03,263 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:04:03,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:03,477 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:03,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:03,477 INFO L82 PathProgramCache]: Analyzing trace with hash 1868161067, now seen corresponding path program 1 times [2020-07-21 21:04:03,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:03,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [690213709] [2020-07-21 21:04:03,478 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:03,927 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:03,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:03,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 1626 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 21:04:03,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:04,020 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:04,020 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:04,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [690213709] [2020-07-21 21:04:04,021 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:04,021 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:04:04,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374684170] [2020-07-21 21:04:04,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:04:04,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:04,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:04:04,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:04:04,023 INFO L87 Difference]: Start difference. First operand 3932 states and 6750 transitions. Second operand 4 states. [2020-07-21 21:04:04,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:04,125 INFO L93 Difference]: Finished difference Result 5436 states and 9294 transitions. [2020-07-21 21:04:04,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:04:04,126 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 322 [2020-07-21 21:04:04,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:04,146 INFO L225 Difference]: With dead ends: 5436 [2020-07-21 21:04:04,147 INFO L226 Difference]: Without dead ends: 3732 [2020-07-21 21:04:04,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:04:04,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3732 states. [2020-07-21 21:04:04,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3732 to 3593. [2020-07-21 21:04:04,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3593 states. [2020-07-21 21:04:04,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3593 states to 3593 states and 6169 transitions. [2020-07-21 21:04:04,270 INFO L78 Accepts]: Start accepts. Automaton has 3593 states and 6169 transitions. Word has length 322 [2020-07-21 21:04:04,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:04,271 INFO L479 AbstractCegarLoop]: Abstraction has 3593 states and 6169 transitions. [2020-07-21 21:04:04,271 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:04:04,272 INFO L276 IsEmpty]: Start isEmpty. Operand 3593 states and 6169 transitions. [2020-07-21 21:04:04,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-07-21 21:04:04,284 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:04,284 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] [2020-07-21 21:04:04,498 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:04,499 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:04,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:04,499 INFO L82 PathProgramCache]: Analyzing trace with hash -1292517172, now seen corresponding path program 1 times [2020-07-21 21:04:04,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:04,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [627112497] [2020-07-21 21:04:04,500 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:04,873 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:04,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:04,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 1638 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 21:04:04,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:04,967 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:04,967 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:04,968 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [627112497] [2020-07-21 21:04:04,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:04,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:04:04,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169813949] [2020-07-21 21:04:04,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:04:04,969 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:04,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:04:04,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:04:04,970 INFO L87 Difference]: Start difference. First operand 3593 states and 6169 transitions. Second operand 4 states. [2020-07-21 21:04:05,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:05,197 INFO L93 Difference]: Finished difference Result 6640 states and 11312 transitions. [2020-07-21 21:04:05,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 21:04:05,198 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 330 [2020-07-21 21:04:05,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:05,222 INFO L225 Difference]: With dead ends: 6640 [2020-07-21 21:04:05,222 INFO L226 Difference]: Without dead ends: 3593 [2020-07-21 21:04:05,232 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 [2020-07-21 21:04:05,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3593 states. [2020-07-21 21:04:05,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3593 to 3593. [2020-07-21 21:04:05,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3593 states. [2020-07-21 21:04:05,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3593 states to 3593 states and 6109 transitions. [2020-07-21 21:04:05,370 INFO L78 Accepts]: Start accepts. Automaton has 3593 states and 6109 transitions. Word has length 330 [2020-07-21 21:04:05,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:05,371 INFO L479 AbstractCegarLoop]: Abstraction has 3593 states and 6109 transitions. [2020-07-21 21:04:05,371 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:04:05,371 INFO L276 IsEmpty]: Start isEmpty. Operand 3593 states and 6109 transitions. [2020-07-21 21:04:05,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2020-07-21 21:04:05,391 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:05,391 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:04:05,605 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:05,606 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:05,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:05,607 INFO L82 PathProgramCache]: Analyzing trace with hash 20247992, now seen corresponding path program 1 times [2020-07-21 21:04:05,607 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:05,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [164227553] [2020-07-21 21:04:05,608 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:06,110 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:06,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:06,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 1676 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:04:06,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:06,275 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:06,275 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:06,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [164227553] [2020-07-21 21:04:06,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:06,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:04:06,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859046925] [2020-07-21 21:04:06,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:04:06,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:06,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:04:06,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:06,278 INFO L87 Difference]: Start difference. First operand 3593 states and 6109 transitions. Second operand 3 states. [2020-07-21 21:04:06,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:06,574 INFO L93 Difference]: Finished difference Result 8211 states and 13909 transitions. [2020-07-21 21:04:06,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:04:06,574 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 389 [2020-07-21 21:04:06,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:06,590 INFO L225 Difference]: With dead ends: 8211 [2020-07-21 21:04:06,590 INFO L226 Difference]: Without dead ends: 6042 [2020-07-21 21:04:06,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 387 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:06,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6042 states. [2020-07-21 21:04:06,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6042 to 5217. [2020-07-21 21:04:06,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5217 states. [2020-07-21 21:04:06,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5217 states to 5217 states and 8853 transitions. [2020-07-21 21:04:06,768 INFO L78 Accepts]: Start accepts. Automaton has 5217 states and 8853 transitions. Word has length 389 [2020-07-21 21:04:06,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:06,768 INFO L479 AbstractCegarLoop]: Abstraction has 5217 states and 8853 transitions. [2020-07-21 21:04:06,769 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:04:06,769 INFO L276 IsEmpty]: Start isEmpty. Operand 5217 states and 8853 transitions. [2020-07-21 21:04:06,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 394 [2020-07-21 21:04:06,786 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:06,786 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:04:06,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:06,995 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:06,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:06,995 INFO L82 PathProgramCache]: Analyzing trace with hash 673930817, now seen corresponding path program 1 times [2020-07-21 21:04:06,996 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:06,996 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1348981420] [2020-07-21 21:04:06,996 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:07,361 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:07,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:07,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 1678 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:04:07,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:07,543 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:07,544 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:07,544 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1348981420] [2020-07-21 21:04:07,544 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:07,544 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:04:07,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523515] [2020-07-21 21:04:07,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:04:07,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:07,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:04:07,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:07,547 INFO L87 Difference]: Start difference. First operand 5217 states and 8853 transitions. Second operand 3 states. [2020-07-21 21:04:07,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:07,929 INFO L93 Difference]: Finished difference Result 12322 states and 20847 transitions. [2020-07-21 21:04:07,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:04:07,930 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 393 [2020-07-21 21:04:07,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:07,952 INFO L225 Difference]: With dead ends: 12322 [2020-07-21 21:04:07,953 INFO L226 Difference]: Without dead ends: 8958 [2020-07-21 21:04:07,964 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 391 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:07,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8958 states. [2020-07-21 21:04:08,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8958 to 8158. [2020-07-21 21:04:08,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8158 states. [2020-07-21 21:04:08,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8158 states to 8158 states and 13817 transitions. [2020-07-21 21:04:08,210 INFO L78 Accepts]: Start accepts. Automaton has 8158 states and 13817 transitions. Word has length 393 [2020-07-21 21:04:08,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:08,210 INFO L479 AbstractCegarLoop]: Abstraction has 8158 states and 13817 transitions. [2020-07-21 21:04:08,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:04:08,211 INFO L276 IsEmpty]: Start isEmpty. Operand 8158 states and 13817 transitions. [2020-07-21 21:04:08,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 398 [2020-07-21 21:04:08,227 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:08,227 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:04:08,442 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:08,443 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:08,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:08,443 INFO L82 PathProgramCache]: Analyzing trace with hash -1566711354, now seen corresponding path program 1 times [2020-07-21 21:04:08,443 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:08,444 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1491333824] [2020-07-21 21:04:08,444 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:08,822 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:08,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:08,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 1681 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:04:08,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:08,953 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:08,953 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:08,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1491333824] [2020-07-21 21:04:08,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:08,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:04:08,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358016038] [2020-07-21 21:04:08,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:04:08,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:08,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:04:08,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:08,955 INFO L87 Difference]: Start difference. First operand 8158 states and 13817 transitions. Second operand 3 states. [2020-07-21 21:04:09,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:09,498 INFO L93 Difference]: Finished difference Result 19549 states and 33026 transitions. [2020-07-21 21:04:09,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:04:09,499 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 397 [2020-07-21 21:04:09,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:09,551 INFO L225 Difference]: With dead ends: 19549 [2020-07-21 21:04:09,551 INFO L226 Difference]: Without dead ends: 14100 [2020-07-21 21:04:09,573 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 395 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:09,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14100 states. [2020-07-21 21:04:11,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14100 to 13319. [2020-07-21 21:04:11,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13319 states. [2020-07-21 21:04:11,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13319 states to 13319 states and 22513 transitions. [2020-07-21 21:04:11,028 INFO L78 Accepts]: Start accepts. Automaton has 13319 states and 22513 transitions. Word has length 397 [2020-07-21 21:04:11,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:11,029 INFO L479 AbstractCegarLoop]: Abstraction has 13319 states and 22513 transitions. [2020-07-21 21:04:11,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:04:11,029 INFO L276 IsEmpty]: Start isEmpty. Operand 13319 states and 22513 transitions. [2020-07-21 21:04:11,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2020-07-21 21:04:11,051 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:11,051 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:04:11,265 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:11,266 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:11,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:11,269 INFO L82 PathProgramCache]: Analyzing trace with hash -920485006, now seen corresponding path program 1 times [2020-07-21 21:04:11,270 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:11,270 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [118767210] [2020-07-21 21:04:11,270 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:11,644 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:11,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:11,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 1685 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:04:11,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:11,820 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:11,820 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:11,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [118767210] [2020-07-21 21:04:11,821 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:11,821 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:04:11,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423839058] [2020-07-21 21:04:11,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:04:11,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:11,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:04:11,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:11,822 INFO L87 Difference]: Start difference. First operand 13319 states and 22513 transitions. Second operand 3 states. [2020-07-21 21:04:12,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:12,919 INFO L93 Difference]: Finished difference Result 31769 states and 53569 transitions. [2020-07-21 21:04:12,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:04:12,919 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 400 [2020-07-21 21:04:12,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:12,968 INFO L225 Difference]: With dead ends: 31769 [2020-07-21 21:04:12,969 INFO L226 Difference]: Without dead ends: 22866 [2020-07-21 21:04:12,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 398 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:13,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22866 states. [2020-07-21 21:04:13,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22866 to 22092. [2020-07-21 21:04:13,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22092 states. [2020-07-21 21:04:13,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22092 states to 22092 states and 37257 transitions. [2020-07-21 21:04:13,685 INFO L78 Accepts]: Start accepts. Automaton has 22092 states and 37257 transitions. Word has length 400 [2020-07-21 21:04:13,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:13,686 INFO L479 AbstractCegarLoop]: Abstraction has 22092 states and 37257 transitions. [2020-07-21 21:04:13,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:04:13,686 INFO L276 IsEmpty]: Start isEmpty. Operand 22092 states and 37257 transitions. [2020-07-21 21:04:13,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 403 [2020-07-21 21:04:13,719 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:13,720 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:04:13,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:13,935 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:13,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:13,935 INFO L82 PathProgramCache]: Analyzing trace with hash 565610897, now seen corresponding path program 1 times [2020-07-21 21:04:13,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:13,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1624684203] [2020-07-21 21:04:13,936 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:14,297 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:14,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:14,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 1691 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:04:14,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:14,459 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:14,459 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:14,459 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1624684203] [2020-07-21 21:04:14,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:14,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:04:14,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818143707] [2020-07-21 21:04:14,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:04:14,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:14,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:04:14,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:14,462 INFO L87 Difference]: Start difference. First operand 22092 states and 37257 transitions. Second operand 3 states. [2020-07-21 21:04:15,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:15,461 INFO L93 Difference]: Finished difference Result 51332 states and 86333 transitions. [2020-07-21 21:04:15,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:04:15,461 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 402 [2020-07-21 21:04:15,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:15,525 INFO L225 Difference]: With dead ends: 51332 [2020-07-21 21:04:15,526 INFO L226 Difference]: Without dead ends: 37059 [2020-07-21 21:04:15,564 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 400 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:15,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37059 states. [2020-07-21 21:04:17,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37059 to 35775. [2020-07-21 21:04:17,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35775 states. [2020-07-21 21:04:17,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35775 states to 35775 states and 60158 transitions. [2020-07-21 21:04:17,701 INFO L78 Accepts]: Start accepts. Automaton has 35775 states and 60158 transitions. Word has length 402 [2020-07-21 21:04:17,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:17,701 INFO L479 AbstractCegarLoop]: Abstraction has 35775 states and 60158 transitions. [2020-07-21 21:04:17,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:04:17,701 INFO L276 IsEmpty]: Start isEmpty. Operand 35775 states and 60158 transitions. [2020-07-21 21:04:17,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 404 [2020-07-21 21:04:17,731 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:17,731 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:04:17,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:17,932 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:17,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:17,933 INFO L82 PathProgramCache]: Analyzing trace with hash 1278828941, now seen corresponding path program 1 times [2020-07-21 21:04:17,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:17,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1412443008] [2020-07-21 21:04:17,934 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:18,313 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:18,313 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:18,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 1697 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 21:04:18,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:18,414 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:18,414 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:18,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1412443008] [2020-07-21 21:04:18,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:18,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:04:18,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106741802] [2020-07-21 21:04:18,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:04:18,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:18,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:04:18,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:18,417 INFO L87 Difference]: Start difference. First operand 35775 states and 60158 transitions. Second operand 3 states. [2020-07-21 21:04:20,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:20,304 INFO L93 Difference]: Finished difference Result 101828 states and 171157 transitions. [2020-07-21 21:04:20,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:04:20,304 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 403 [2020-07-21 21:04:20,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:20,391 INFO L225 Difference]: With dead ends: 101828 [2020-07-21 21:04:20,391 INFO L226 Difference]: Without dead ends: 66823 [2020-07-21 21:04:20,449 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 401 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:20,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66823 states. [2020-07-21 21:04:22,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66823 to 66819. [2020-07-21 21:04:22,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66819 states. [2020-07-21 21:04:22,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66819 states to 66819 states and 112264 transitions. [2020-07-21 21:04:22,314 INFO L78 Accepts]: Start accepts. Automaton has 66819 states and 112264 transitions. Word has length 403 [2020-07-21 21:04:22,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:22,315 INFO L479 AbstractCegarLoop]: Abstraction has 66819 states and 112264 transitions. [2020-07-21 21:04:22,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:04:22,315 INFO L276 IsEmpty]: Start isEmpty. Operand 66819 states and 112264 transitions. [2020-07-21 21:04:22,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 404 [2020-07-21 21:04:22,366 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:22,366 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:04:22,581 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:22,582 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:22,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:22,583 INFO L82 PathProgramCache]: Analyzing trace with hash 713530010, now seen corresponding path program 1 times [2020-07-21 21:04:22,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:22,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1877796178] [2020-07-21 21:04:22,584 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:22,983 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:22,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:22,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 1696 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 21:04:22,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:23,096 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:23,096 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:23,096 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1877796178] [2020-07-21 21:04:23,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:23,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:04:23,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998975889] [2020-07-21 21:04:23,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:04:23,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:23,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:04:23,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:04:23,099 INFO L87 Difference]: Start difference. First operand 66819 states and 112264 transitions. Second operand 4 states. [2020-07-21 21:04:25,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:25,690 INFO L93 Difference]: Finished difference Result 103277 states and 173326 transitions. [2020-07-21 21:04:25,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:04:25,691 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 403 [2020-07-21 21:04:25,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:25,817 INFO L225 Difference]: With dead ends: 103277 [2020-07-21 21:04:25,817 INFO L226 Difference]: Without dead ends: 66469 [2020-07-21 21:04:25,893 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 400 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:04:25,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66469 states. [2020-07-21 21:04:27,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66469 to 42097. [2020-07-21 21:04:27,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42097 states. [2020-07-21 21:04:27,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42097 states to 42097 states and 70464 transitions. [2020-07-21 21:04:27,470 INFO L78 Accepts]: Start accepts. Automaton has 42097 states and 70464 transitions. Word has length 403 [2020-07-21 21:04:27,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:27,471 INFO L479 AbstractCegarLoop]: Abstraction has 42097 states and 70464 transitions. [2020-07-21 21:04:27,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:04:27,471 INFO L276 IsEmpty]: Start isEmpty. Operand 42097 states and 70464 transitions. [2020-07-21 21:04:27,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 412 [2020-07-21 21:04:27,491 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:27,491 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:04:27,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:27,706 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:27,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:27,707 INFO L82 PathProgramCache]: Analyzing trace with hash 217796803, now seen corresponding path program 1 times [2020-07-21 21:04:27,707 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:27,708 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437477454] [2020-07-21 21:04:27,708 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:28,100 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:28,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:28,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 1703 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 21:04:28,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:28,193 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:28,194 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:28,194 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [437477454] [2020-07-21 21:04:28,194 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:28,194 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:04:28,194 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749462616] [2020-07-21 21:04:28,195 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:04:28,195 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:28,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:04:28,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:04:28,195 INFO L87 Difference]: Start difference. First operand 42097 states and 70464 transitions. Second operand 4 states. [2020-07-21 21:04:28,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:28,995 INFO L93 Difference]: Finished difference Result 78931 states and 132149 transitions. [2020-07-21 21:04:28,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:04:28,995 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 411 [2020-07-21 21:04:28,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:29,056 INFO L225 Difference]: With dead ends: 78931 [2020-07-21 21:04:29,056 INFO L226 Difference]: Without dead ends: 41797 [2020-07-21 21:04:29,103 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 408 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:04:29,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41797 states. [2020-07-21 21:04:30,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41797 to 38472. [2020-07-21 21:04:30,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38472 states. [2020-07-21 21:04:30,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38472 states to 38472 states and 64461 transitions. [2020-07-21 21:04:30,571 INFO L78 Accepts]: Start accepts. Automaton has 38472 states and 64461 transitions. Word has length 411 [2020-07-21 21:04:30,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:30,571 INFO L479 AbstractCegarLoop]: Abstraction has 38472 states and 64461 transitions. [2020-07-21 21:04:30,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:04:30,571 INFO L276 IsEmpty]: Start isEmpty. Operand 38472 states and 64461 transitions. [2020-07-21 21:04:30,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 415 [2020-07-21 21:04:30,581 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:30,582 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:04:30,793 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:30,793 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:30,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:30,794 INFO L82 PathProgramCache]: Analyzing trace with hash -1532310655, now seen corresponding path program 1 times [2020-07-21 21:04:30,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:30,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [220416723] [2020-07-21 21:04:30,796 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:31,184 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:31,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:31,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 1703 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 21:04:31,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:31,299 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:31,300 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:31,300 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [220416723] [2020-07-21 21:04:31,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:31,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:04:31,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659817094] [2020-07-21 21:04:31,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:04:31,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:31,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:04:31,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:04:31,304 INFO L87 Difference]: Start difference. First operand 38472 states and 64461 transitions. Second operand 4 states. [2020-07-21 21:04:32,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:32,066 INFO L93 Difference]: Finished difference Result 70553 states and 118274 transitions. [2020-07-21 21:04:32,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:04:32,067 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 414 [2020-07-21 21:04:32,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:32,117 INFO L225 Difference]: With dead ends: 70553 [2020-07-21 21:04:32,117 INFO L226 Difference]: Without dead ends: 38172 [2020-07-21 21:04:32,153 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 414 GetRequests, 411 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:04:32,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38172 states. [2020-07-21 21:04:34,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38172 to 34847. [2020-07-21 21:04:34,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34847 states. [2020-07-21 21:04:34,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34847 states to 34847 states and 58458 transitions. [2020-07-21 21:04:34,236 INFO L78 Accepts]: Start accepts. Automaton has 34847 states and 58458 transitions. Word has length 414 [2020-07-21 21:04:34,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:34,237 INFO L479 AbstractCegarLoop]: Abstraction has 34847 states and 58458 transitions. [2020-07-21 21:04:34,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:04:34,237 INFO L276 IsEmpty]: Start isEmpty. Operand 34847 states and 58458 transitions. [2020-07-21 21:04:34,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 418 [2020-07-21 21:04:34,244 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:34,244 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:04:34,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:34,450 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:34,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:34,451 INFO L82 PathProgramCache]: Analyzing trace with hash 1730706966, now seen corresponding path program 1 times [2020-07-21 21:04:34,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:34,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1396703083] [2020-07-21 21:04:34,452 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:34,977 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 21:04:34,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:34,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 2951 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:04:34,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:35,062 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:35,062 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:35,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1396703083] [2020-07-21 21:04:35,063 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:35,063 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:04:35,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201062729] [2020-07-21 21:04:35,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:04:35,064 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:35,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:04:35,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:35,065 INFO L87 Difference]: Start difference. First operand 34847 states and 58458 transitions. Second operand 3 states. [2020-07-21 21:04:36,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:36,825 INFO L93 Difference]: Finished difference Result 95904 states and 160730 transitions. [2020-07-21 21:04:36,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:04:36,826 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 417 [2020-07-21 21:04:36,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:36,921 INFO L225 Difference]: With dead ends: 95904 [2020-07-21 21:04:36,921 INFO L226 Difference]: Without dead ends: 61929 [2020-07-21 21:04:36,956 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 415 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:37,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61929 states. [2020-07-21 21:04:38,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61929 to 61925. [2020-07-21 21:04:38,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61925 states. [2020-07-21 21:04:38,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61925 states to 61925 states and 103568 transitions. [2020-07-21 21:04:38,524 INFO L78 Accepts]: Start accepts. Automaton has 61925 states and 103568 transitions. Word has length 417 [2020-07-21 21:04:38,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:38,525 INFO L479 AbstractCegarLoop]: Abstraction has 61925 states and 103568 transitions. [2020-07-21 21:04:38,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:04:38,525 INFO L276 IsEmpty]: Start isEmpty. Operand 61925 states and 103568 transitions. [2020-07-21 21:04:38,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 432 [2020-07-21 21:04:38,536 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:38,536 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:04:38,736 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:38,737 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:38,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:38,738 INFO L82 PathProgramCache]: Analyzing trace with hash -964076392, now seen corresponding path program 1 times [2020-07-21 21:04:38,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:38,738 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1139312798] [2020-07-21 21:04:38,739 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:39,112 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:39,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:39,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 1721 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:04:39,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:39,573 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:39,573 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:39,573 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1139312798] [2020-07-21 21:04:39,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:39,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:04:39,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084451725] [2020-07-21 21:04:39,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:04:39,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:39,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:04:39,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:39,575 INFO L87 Difference]: Start difference. First operand 61925 states and 103568 transitions. Second operand 3 states. [2020-07-21 21:04:41,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:41,765 INFO L93 Difference]: Finished difference Result 147598 states and 246620 transitions. [2020-07-21 21:04:41,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:04:41,765 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 431 [2020-07-21 21:04:41,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:41,935 INFO L225 Difference]: With dead ends: 147598 [2020-07-21 21:04:41,935 INFO L226 Difference]: Without dead ends: 86523 [2020-07-21 21:04:42,040 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 429 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:42,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86523 states. [2020-07-21 21:04:46,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86523 to 86508. [2020-07-21 21:04:46,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86508 states. [2020-07-21 21:04:46,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86508 states to 86508 states and 144543 transitions. [2020-07-21 21:04:46,552 INFO L78 Accepts]: Start accepts. Automaton has 86508 states and 144543 transitions. Word has length 431 [2020-07-21 21:04:46,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:46,553 INFO L479 AbstractCegarLoop]: Abstraction has 86508 states and 144543 transitions. [2020-07-21 21:04:46,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:04:46,553 INFO L276 IsEmpty]: Start isEmpty. Operand 86508 states and 144543 transitions. [2020-07-21 21:04:46,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 432 [2020-07-21 21:04:46,567 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:46,568 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:04:46,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:46,769 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:46,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:46,770 INFO L82 PathProgramCache]: Analyzing trace with hash 1837564182, now seen corresponding path program 1 times [2020-07-21 21:04:46,770 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:46,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1996788332] [2020-07-21 21:04:46,771 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:47,296 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 21:04:47,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:47,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 2979 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:04:47,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:47,416 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:47,416 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:47,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1996788332] [2020-07-21 21:04:47,416 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:47,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:04:47,417 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366869253] [2020-07-21 21:04:47,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:04:47,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:47,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:04:47,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:47,418 INFO L87 Difference]: Start difference. First operand 86508 states and 144543 transitions. Second operand 3 states. [2020-07-21 21:04:50,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:50,151 INFO L93 Difference]: Finished difference Result 183794 states and 306921 transitions. [2020-07-21 21:04:50,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:04:50,152 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 431 [2020-07-21 21:04:50,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:50,308 INFO L225 Difference]: With dead ends: 183794 [2020-07-21 21:04:50,308 INFO L226 Difference]: Without dead ends: 98518 [2020-07-21 21:04:50,399 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 429 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:50,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98518 states. [2020-07-21 21:04:55,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98518 to 97848. [2020-07-21 21:04:55,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97848 states. [2020-07-21 21:04:55,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97848 states to 97848 states and 163289 transitions. [2020-07-21 21:04:55,457 INFO L78 Accepts]: Start accepts. Automaton has 97848 states and 163289 transitions. Word has length 431 [2020-07-21 21:04:55,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:55,458 INFO L479 AbstractCegarLoop]: Abstraction has 97848 states and 163289 transitions. [2020-07-21 21:04:55,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:04:55,458 INFO L276 IsEmpty]: Start isEmpty. Operand 97848 states and 163289 transitions. [2020-07-21 21:04:55,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 436 [2020-07-21 21:04:55,474 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:55,475 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:04:55,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:55,676 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:55,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:55,677 INFO L82 PathProgramCache]: Analyzing trace with hash 855381512, now seen corresponding path program 1 times [2020-07-21 21:04:55,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:55,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964617951] [2020-07-21 21:04:55,678 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:56,059 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:56,059 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:56,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 1724 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:04:56,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:56,560 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:04:56,560 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:56,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [964617951] [2020-07-21 21:04:56,561 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:56,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:04:56,561 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595680746] [2020-07-21 21:04:56,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:04:56,562 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:56,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:04:56,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:56,562 INFO L87 Difference]: Start difference. First operand 97848 states and 163289 transitions. Second operand 3 states. [2020-07-21 21:05:00,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:00,149 INFO L93 Difference]: Finished difference Result 230228 states and 384472 transitions. [2020-07-21 21:05:00,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:05:00,150 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 435 [2020-07-21 21:05:00,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:00,376 INFO L225 Difference]: With dead ends: 230228 [2020-07-21 21:05:00,376 INFO L226 Difference]: Without dead ends: 144292 [2020-07-21 21:05:00,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 433 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:00,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144292 states. [2020-07-21 21:05:07,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144292 to 144288. [2020-07-21 21:05:07,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144288 states. [2020-07-21 21:05:08,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144288 states to 144288 states and 240581 transitions. [2020-07-21 21:05:08,038 INFO L78 Accepts]: Start accepts. Automaton has 144288 states and 240581 transitions. Word has length 435 [2020-07-21 21:05:08,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:08,039 INFO L479 AbstractCegarLoop]: Abstraction has 144288 states and 240581 transitions. [2020-07-21 21:05:08,039 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:05:08,039 INFO L276 IsEmpty]: Start isEmpty. Operand 144288 states and 240581 transitions. [2020-07-21 21:05:08,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 440 [2020-07-21 21:05:08,055 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:08,056 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:05:08,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:08,256 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:08,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:08,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1334176463, now seen corresponding path program 1 times [2020-07-21 21:05:08,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:08,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [69037293] [2020-07-21 21:05:08,258 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:08,649 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:08,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:08,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 1728 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:05:08,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:08,815 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:08,815 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:08,815 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [69037293] [2020-07-21 21:05:08,815 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:08,815 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:05:08,816 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717547257] [2020-07-21 21:05:08,816 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:05:08,816 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:08,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:05:08,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:05:08,817 INFO L87 Difference]: Start difference. First operand 144288 states and 240581 transitions. Second operand 4 states. [2020-07-21 21:05:20,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:20,923 INFO L93 Difference]: Finished difference Result 431067 states and 718672 transitions. [2020-07-21 21:05:20,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:05:20,924 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 439 [2020-07-21 21:05:20,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:21,400 INFO L225 Difference]: With dead ends: 431067 [2020-07-21 21:05:21,401 INFO L226 Difference]: Without dead ends: 286796 [2020-07-21 21:05:21,538 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 439 GetRequests, 436 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:05:21,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286796 states. [2020-07-21 21:05:34,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286796 to 286792. [2020-07-21 21:05:34,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286792 states. [2020-07-21 21:05:35,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286792 states to 286792 states and 477105 transitions. [2020-07-21 21:05:35,341 INFO L78 Accepts]: Start accepts. Automaton has 286792 states and 477105 transitions. Word has length 439 [2020-07-21 21:05:35,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:35,342 INFO L479 AbstractCegarLoop]: Abstraction has 286792 states and 477105 transitions. [2020-07-21 21:05:35,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:05:35,342 INFO L276 IsEmpty]: Start isEmpty. Operand 286792 states and 477105 transitions. [2020-07-21 21:05:35,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 442 [2020-07-21 21:05:35,375 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:35,375 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:05:35,576 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:35,576 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:35,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:35,577 INFO L82 PathProgramCache]: Analyzing trace with hash 1797289440, now seen corresponding path program 1 times [2020-07-21 21:05:35,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:35,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [589698005] [2020-07-21 21:05:35,578 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:36,456 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:36,457 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:36,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 1729 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:05:36,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:36,641 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:36,641 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:36,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [589698005] [2020-07-21 21:05:36,641 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:36,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:05:36,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412811015] [2020-07-21 21:05:36,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:05:36,642 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:36,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:05:36,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:05:36,643 INFO L87 Difference]: Start difference. First operand 286792 states and 477105 transitions. Second operand 4 states. [2020-07-21 21:06:00,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:06:00,638 INFO L93 Difference]: Finished difference Result 856512 states and 1424624 transitions. [2020-07-21 21:06:00,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:06:00,639 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 441 [2020-07-21 21:06:00,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:06:01,569 INFO L225 Difference]: With dead ends: 856512 [2020-07-21 21:06:01,569 INFO L226 Difference]: Without dead ends: 569738 [2020-07-21 21:06:01,840 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 438 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:06:02,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 569738 states. [2020-07-21 21:06:38,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 569738 to 569734. [2020-07-21 21:06:38,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 569734 states. [2020-07-21 21:06:40,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 569734 states to 569734 states and 945231 transitions. [2020-07-21 21:06:40,021 INFO L78 Accepts]: Start accepts. Automaton has 569734 states and 945231 transitions. Word has length 441 [2020-07-21 21:06:40,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:06:40,022 INFO L479 AbstractCegarLoop]: Abstraction has 569734 states and 945231 transitions. [2020-07-21 21:06:40,022 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:06:40,022 INFO L276 IsEmpty]: Start isEmpty. Operand 569734 states and 945231 transitions. [2020-07-21 21:06:40,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2020-07-21 21:06:40,119 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:06:40,119 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [MP z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (23)] Forcibly destroying the process [2020-07-21 21:06:41,004 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:06:41,005 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:06:41,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:06:41,005 INFO L82 PathProgramCache]: Analyzing trace with hash 851280521, now seen corresponding path program 1 times [2020-07-21 21:06:41,005 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:06:41,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1432990276] [2020-07-21 21:06:41,006 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:06:41,407 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:06:41,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:06:41,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 1732 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:06:41,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:06:41,734 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:06:41,735 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:06:41,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1432990276] [2020-07-21 21:06:41,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:06:41,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:06:41,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132976800] [2020-07-21 21:06:41,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:06:41,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:06:41,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:06:41,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:06:41,737 INFO L87 Difference]: Start difference. First operand 569734 states and 945231 transitions. Second operand 4 states. [2020-07-21 21:07:41,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:07:41,544 INFO L93 Difference]: Finished difference Result 1701083 states and 2821522 transitions. [2020-07-21 21:07:41,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:07:41,544 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 444 [2020-07-21 21:07:41,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:07:43,573 INFO L225 Difference]: With dead ends: 1701083 [2020-07-21 21:07:43,573 INFO L226 Difference]: Without dead ends: 1131384 [2020-07-21 21:07:44,136 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 441 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:07:45,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1131384 states. [2020-07-21 21:09:14,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1131384 to 1131380. [2020-07-21 21:09:14,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1131380 states. [2020-07-21 21:09:17,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1131380 states to 1131380 states and 1871320 transitions. [2020-07-21 21:09:17,618 INFO L78 Accepts]: Start accepts. Automaton has 1131380 states and 1871320 transitions. Word has length 444 [2020-07-21 21:09:17,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:09:17,618 INFO L479 AbstractCegarLoop]: Abstraction has 1131380 states and 1871320 transitions. [2020-07-21 21:09:17,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:09:17,618 INFO L276 IsEmpty]: Start isEmpty. Operand 1131380 states and 1871320 transitions. [2020-07-21 21:09:17,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 447 [2020-07-21 21:09:17,788 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:09:17,788 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:09:17,988 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:09:17,989 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:09:17,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:09:17,990 INFO L82 PathProgramCache]: Analyzing trace with hash 219345117, now seen corresponding path program 1 times [2020-07-21 21:09:17,991 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:09:17,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1216473002] [2020-07-21 21:09:17,992 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:09:18,368 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:09:18,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:09:18,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 1731 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:09:18,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:09:20,262 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:09:20,262 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:09:20,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1216473002] [2020-07-21 21:09:20,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:09:20,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:09:20,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839998079] [2020-07-21 21:09:20,264 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:09:20,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:09:20,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:09:20,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:09:20,264 INFO L87 Difference]: Start difference. First operand 1131380 states and 1871320 transitions. Second operand 4 states.