/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 14:52:38,908 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 14:52:38,910 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 14:52:38,929 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 14:52:38,929 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 14:52:38,931 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 14:52:38,932 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 14:52:38,936 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 14:52:38,940 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 14:52:38,943 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 14:52:38,945 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 14:52:38,946 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 14:52:38,946 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 14:52:38,950 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 14:52:38,951 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 14:52:38,952 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 14:52:38,953 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 14:52:38,954 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 14:52:38,955 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 14:52:38,957 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 14:52:38,958 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 14:52:38,960 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 14:52:38,961 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 14:52:38,961 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 14:52:38,964 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 14:52:38,971 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 14:52:38,972 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 14:52:38,973 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 14:52:38,973 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 14:52:38,988 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 14:52:38,988 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 14:52:38,989 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 14:52:38,989 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 14:52:38,990 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 14:52:38,990 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 14:52:38,990 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 14:52:38,990 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 14:52:38,990 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 14:52:38,990 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 14:52:38,991 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 14:52:38,991 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 14:52:38,991 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 14:52:38,991 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 14:52:38,991 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 14:52:38,992 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 14:52:38,992 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 14:52:38,992 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 14:52:38,992 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 14:52:38,992 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 14:52:38,992 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 14:52:38,993 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 14:52:38,993 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 14:52:38,993 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 14:52:38,993 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 14:52:38,993 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 14:52:38,994 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:52:38,994 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 14:52:38,994 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 14:52:38,994 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 14:52:39,320 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 14:52:39,338 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 14:52:39,342 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 14:52:39,344 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 14:52:39,344 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 14:52:39,346 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-21 14:52:39,426 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6b3545754/810eb0167f1240a8a0d274421a4d3fdb/FLAG92478d6bf [2020-07-21 14:52:40,135 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 14:52:40,136 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-21 14:52:40,177 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6b3545754/810eb0167f1240a8a0d274421a4d3fdb/FLAG92478d6bf [2020-07-21 14:52:40,218 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6b3545754/810eb0167f1240a8a0d274421a4d3fdb [2020-07-21 14:52:40,231 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 14:52:40,235 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 14:52:40,239 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 14:52:40,240 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 14:52:40,244 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 14:52:40,245 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:52:40" (1/1) ... [2020-07-21 14:52:40,248 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@262fcb53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:52:40, skipping insertion in model container [2020-07-21 14:52:40,249 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:52:40" (1/1) ... [2020-07-21 14:52:40,258 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 14:52:40,472 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 14:52:42,101 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:52:42,115 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 14:52:43,233 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:52:43,272 INFO L208 MainTranslator]: Completed translation [2020-07-21 14:52:43,273 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:52:43 WrapperNode [2020-07-21 14:52:43,274 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 14:52:43,275 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 14:52:43,275 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 14:52:43,276 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 14:52:43,292 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:52:43" (1/1) ... [2020-07-21 14:52:43,294 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:52:43" (1/1) ... [2020-07-21 14:52:43,357 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:52:43" (1/1) ... [2020-07-21 14:52:43,357 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:52:43" (1/1) ... [2020-07-21 14:52:43,435 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:52:43" (1/1) ... [2020-07-21 14:52:43,474 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:52:43" (1/1) ... [2020-07-21 14:52:43,486 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:52:43" (1/1) ... [2020-07-21 14:52:43,511 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 14:52:43,517 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 14:52:43,517 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 14:52:43,517 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 14:52:43,519 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:52:43" (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 14:52:43,627 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 14:52:43,628 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 14:52:43,628 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 14:52:43,628 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 14:52:43,629 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 14:52:43,630 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 14:52:43,630 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-07-21 14:52:43,630 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 14:52:43,631 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-21 14:52:43,631 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 14:52:43,632 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 14:52:43,632 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-21 14:52:43,632 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-21 14:52:43,632 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-21 14:52:43,633 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-21 14:52:43,634 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-21 14:52:43,634 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-21 14:52:43,634 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-21 14:52:43,635 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 14:52:43,635 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-21 14:52:43,636 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 14:52:43,636 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 14:52:43,636 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 14:52:48,041 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 14:52:48,042 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 14:52:48,054 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:52:48 BoogieIcfgContainer [2020-07-21 14:52:48,054 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 14:52:48,055 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 14:52:48,056 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 14:52:48,059 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 14:52:48,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 02:52:40" (1/3) ... [2020-07-21 14:52:48,060 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f64a043 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:52:48, skipping insertion in model container [2020-07-21 14:52:48,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:52:43" (2/3) ... [2020-07-21 14:52:48,061 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f64a043 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:52:48, skipping insertion in model container [2020-07-21 14:52:48,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:52:48" (3/3) ... [2020-07-21 14:52:48,063 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-21 14:52:48,075 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 14:52:48,087 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 14:52:48,104 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 14:52:48,135 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 14:52:48,135 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 14:52:48,135 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 14:52:48,135 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 14:52:48,135 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 14:52:48,136 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 14:52:48,136 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 14:52:48,136 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 14:52:48,177 INFO L276 IsEmpty]: Start isEmpty. Operand 1449 states. [2020-07-21 14:52:48,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-21 14:52:48,211 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:52:48,213 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:52:48,214 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:52:48,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:52:48,220 INFO L82 PathProgramCache]: Analyzing trace with hash -2033441387, now seen corresponding path program 1 times [2020-07-21 14:52:48,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:52:48,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [947499242] [2020-07-21 14:52:48,231 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 14:52:49,095 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:52:49,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:52:49,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 3055 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 14:52:49,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:52:49,552 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 14:52:49,552 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:52:49,554 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [947499242] [2020-07-21 14:52:49,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:52:49,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 14:52:49,556 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666631247] [2020-07-21 14:52:49,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 14:52:49,562 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:52:49,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 14:52:49,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 14:52:49,580 INFO L87 Difference]: Start difference. First operand 1449 states. Second operand 3 states. [2020-07-21 14:52:49,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:52:49,982 INFO L93 Difference]: Finished difference Result 2488 states and 4423 transitions. [2020-07-21 14:52:49,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 14:52:49,984 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 496 [2020-07-21 14:52:49,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:52:50,022 INFO L225 Difference]: With dead ends: 2488 [2020-07-21 14:52:50,022 INFO L226 Difference]: Without dead ends: 2186 [2020-07-21 14:52:50,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 494 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 14:52:50,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2186 states. [2020-07-21 14:52:50,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2186 to 2184. [2020-07-21 14:52:50,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2184 states. [2020-07-21 14:52:50,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2184 states to 2184 states and 3563 transitions. [2020-07-21 14:52:50,225 INFO L78 Accepts]: Start accepts. Automaton has 2184 states and 3563 transitions. Word has length 496 [2020-07-21 14:52:50,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:52:50,227 INFO L479 AbstractCegarLoop]: Abstraction has 2184 states and 3563 transitions. [2020-07-21 14:52:50,227 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 14:52:50,227 INFO L276 IsEmpty]: Start isEmpty. Operand 2184 states and 3563 transitions. [2020-07-21 14:52:50,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-21 14:52:50,238 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:52:50,238 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:52:50,452 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:52:50,452 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:52:50,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:52:50,454 INFO L82 PathProgramCache]: Analyzing trace with hash 426855444, now seen corresponding path program 1 times [2020-07-21 14:52:50,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:52:50,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1055207871] [2020-07-21 14:52:50,455 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 14:52:51,108 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:52:51,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:52:51,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 3056 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 14:52:51,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:52:51,532 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 14:52:51,533 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:52:51,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1055207871] [2020-07-21 14:52:51,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:52:51,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 14:52:51,534 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287938574] [2020-07-21 14:52:51,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 14:52:51,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:52:51,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 14:52:51,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 14:52:51,538 INFO L87 Difference]: Start difference. First operand 2184 states and 3563 transitions. Second operand 4 states. [2020-07-21 14:52:51,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:52:51,907 INFO L93 Difference]: Finished difference Result 6477 states and 10566 transitions. [2020-07-21 14:52:51,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 14:52:51,908 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 496 [2020-07-21 14:52:51,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:52:51,935 INFO L225 Difference]: With dead ends: 6477 [2020-07-21 14:52:51,935 INFO L226 Difference]: Without dead ends: 4308 [2020-07-21 14:52:51,944 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 493 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 14:52:51,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4308 states. [2020-07-21 14:52:52,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4308 to 4306. [2020-07-21 14:52:52,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4306 states. [2020-07-21 14:52:52,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4306 states to 4306 states and 6998 transitions. [2020-07-21 14:52:52,135 INFO L78 Accepts]: Start accepts. Automaton has 4306 states and 6998 transitions. Word has length 496 [2020-07-21 14:52:52,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:52:52,136 INFO L479 AbstractCegarLoop]: Abstraction has 4306 states and 6998 transitions. [2020-07-21 14:52:52,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 14:52:52,136 INFO L276 IsEmpty]: Start isEmpty. Operand 4306 states and 6998 transitions. [2020-07-21 14:52:52,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 499 [2020-07-21 14:52:52,154 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:52:52,155 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:52:52,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:52:52,370 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:52:52,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:52:52,371 INFO L82 PathProgramCache]: Analyzing trace with hash 598630969, now seen corresponding path program 1 times [2020-07-21 14:52:52,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:52:52,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1793492564] [2020-07-21 14:52:52,372 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 14:52:53,081 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:52:53,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:52:53,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 3059 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 14:52:53,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:52:53,335 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 14:52:53,335 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:52:53,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1793492564] [2020-07-21 14:52:53,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:52:53,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 14:52:53,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837218526] [2020-07-21 14:52:53,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 14:52:53,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:52:53,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 14:52:53,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 14:52:53,339 INFO L87 Difference]: Start difference. First operand 4306 states and 6998 transitions. Second operand 3 states. [2020-07-21 14:52:53,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:52:53,846 INFO L93 Difference]: Finished difference Result 12571 states and 20378 transitions. [2020-07-21 14:52:53,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 14:52:53,847 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 498 [2020-07-21 14:52:53,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:52:53,891 INFO L225 Difference]: With dead ends: 12571 [2020-07-21 14:52:53,892 INFO L226 Difference]: Without dead ends: 8494 [2020-07-21 14:52:53,902 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 496 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 14:52:53,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8494 states. [2020-07-21 14:52:54,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8494 to 8492. [2020-07-21 14:52:54,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8492 states. [2020-07-21 14:52:54,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8492 states to 8492 states and 13752 transitions. [2020-07-21 14:52:54,278 INFO L78 Accepts]: Start accepts. Automaton has 8492 states and 13752 transitions. Word has length 498 [2020-07-21 14:52:54,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:52:54,279 INFO L479 AbstractCegarLoop]: Abstraction has 8492 states and 13752 transitions. [2020-07-21 14:52:54,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 14:52:54,280 INFO L276 IsEmpty]: Start isEmpty. Operand 8492 states and 13752 transitions. [2020-07-21 14:52:54,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-21 14:52:54,319 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:52:54,320 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:52:54,532 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:52:54,533 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:52:54,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:52:54,533 INFO L82 PathProgramCache]: Analyzing trace with hash 74932662, now seen corresponding path program 1 times [2020-07-21 14:52:54,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:52:54,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1378288522] [2020-07-21 14:52:54,534 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 14:52:54,983 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:52:54,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:52:54,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 1673 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 14:52:55,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:52:55,200 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 14:52:55,201 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:52:55,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1378288522] [2020-07-21 14:52:55,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:52:55,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 14:52:55,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31362308] [2020-07-21 14:52:55,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 14:52:55,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:52:55,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 14:52:55,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 14:52:55,204 INFO L87 Difference]: Start difference. First operand 8492 states and 13752 transitions. Second operand 3 states. [2020-07-21 14:52:55,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:52:55,610 INFO L93 Difference]: Finished difference Result 25220 states and 40793 transitions. [2020-07-21 14:52:55,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 14:52:55,611 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 499 [2020-07-21 14:52:55,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:52:55,678 INFO L225 Difference]: With dead ends: 25220 [2020-07-21 14:52:55,679 INFO L226 Difference]: Without dead ends: 16759 [2020-07-21 14:52:55,701 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 497 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 14:52:55,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16759 states. [2020-07-21 14:52:56,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16759 to 8518. [2020-07-21 14:52:56,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8518 states. [2020-07-21 14:52:56,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8518 states to 8518 states and 13790 transitions. [2020-07-21 14:52:56,104 INFO L78 Accepts]: Start accepts. Automaton has 8518 states and 13790 transitions. Word has length 499 [2020-07-21 14:52:56,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:52:56,104 INFO L479 AbstractCegarLoop]: Abstraction has 8518 states and 13790 transitions. [2020-07-21 14:52:56,104 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 14:52:56,105 INFO L276 IsEmpty]: Start isEmpty. Operand 8518 states and 13790 transitions. [2020-07-21 14:52:56,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2020-07-21 14:52:56,133 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:52:56,134 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:52:56,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:52:56,348 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:52:56,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:52:56,348 INFO L82 PathProgramCache]: Analyzing trace with hash 1851088404, now seen corresponding path program 1 times [2020-07-21 14:52:56,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:52:56,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [448210904] [2020-07-21 14:52:56,350 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 14:52:56,911 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:52:56,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:52:56,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 1672 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 14:52:56,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:52:57,044 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 14:52:57,045 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:52:57,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [448210904] [2020-07-21 14:52:57,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:52:57,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 14:52:57,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [369218694] [2020-07-21 14:52:57,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 14:52:57,047 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:52:57,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 14:52:57,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 14:52:57,048 INFO L87 Difference]: Start difference. First operand 8518 states and 13790 transitions. Second operand 4 states. [2020-07-21 14:52:57,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:52:57,551 INFO L93 Difference]: Finished difference Result 19066 states and 31090 transitions. [2020-07-21 14:52:57,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 14:52:57,552 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 500 [2020-07-21 14:52:57,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:52:57,576 INFO L225 Difference]: With dead ends: 19066 [2020-07-21 14:52:57,580 INFO L226 Difference]: Without dead ends: 9609 [2020-07-21 14:52:57,601 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 497 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 14:52:57,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9609 states. [2020-07-21 14:52:57,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9609 to 9607. [2020-07-21 14:52:57,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9607 states. [2020-07-21 14:52:57,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9607 states to 9607 states and 15619 transitions. [2020-07-21 14:52:57,990 INFO L78 Accepts]: Start accepts. Automaton has 9607 states and 15619 transitions. Word has length 500 [2020-07-21 14:52:57,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:52:57,990 INFO L479 AbstractCegarLoop]: Abstraction has 9607 states and 15619 transitions. [2020-07-21 14:52:57,990 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 14:52:57,990 INFO L276 IsEmpty]: Start isEmpty. Operand 9607 states and 15619 transitions. [2020-07-21 14:52:58,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-21 14:52:58,021 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:52:58,022 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:52:58,234 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:52:58,235 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:52:58,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:52:58,235 INFO L82 PathProgramCache]: Analyzing trace with hash 815858906, now seen corresponding path program 1 times [2020-07-21 14:52:58,235 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:52:58,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [505940980] [2020-07-21 14:52:58,236 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 14:52:58,690 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:52:58,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:52:58,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 1688 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 14:52:58,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:52:58,912 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 14:52:58,912 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:52:58,912 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [505940980] [2020-07-21 14:52:58,913 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:52:58,913 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-21 14:52:58,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705024533] [2020-07-21 14:52:58,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 14:52:58,916 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:52:58,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 14:52:58,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-21 14:52:58,917 INFO L87 Difference]: Start difference. First operand 9607 states and 15619 transitions. Second operand 9 states. [2020-07-21 14:53:09,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:53:09,416 INFO L93 Difference]: Finished difference Result 59226 states and 95013 transitions. [2020-07-21 14:53:09,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 14:53:09,416 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 502 [2020-07-21 14:53:09,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:53:09,554 INFO L225 Difference]: With dead ends: 59226 [2020-07-21 14:53:09,554 INFO L226 Difference]: Without dead ends: 57274 [2020-07-21 14:53:09,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 533 GetRequests, 496 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=370, Invalid=1112, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 14:53:09,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57274 states. [2020-07-21 14:53:10,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57274 to 22386. [2020-07-21 14:53:10,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22386 states. [2020-07-21 14:53:10,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22386 states to 22386 states and 35944 transitions. [2020-07-21 14:53:10,852 INFO L78 Accepts]: Start accepts. Automaton has 22386 states and 35944 transitions. Word has length 502 [2020-07-21 14:53:10,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:53:10,853 INFO L479 AbstractCegarLoop]: Abstraction has 22386 states and 35944 transitions. [2020-07-21 14:53:10,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 14:53:10,853 INFO L276 IsEmpty]: Start isEmpty. Operand 22386 states and 35944 transitions. [2020-07-21 14:53:10,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-21 14:53:10,885 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:53:10,886 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:53:11,101 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:53:11,102 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:53:11,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:53:11,103 INFO L82 PathProgramCache]: Analyzing trace with hash -1949345144, now seen corresponding path program 1 times [2020-07-21 14:53:11,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:53:11,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [128942865] [2020-07-21 14:53:11,105 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 14:53:11,756 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:53:11,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:53:11,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 3075 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 14:53:11,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:53:12,188 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:53:12,188 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:53:12,189 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [128942865] [2020-07-21 14:53:12,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:53:12,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 14:53:12,189 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123509480] [2020-07-21 14:53:12,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 14:53:12,191 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:53:12,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 14:53:12,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-21 14:53:12,192 INFO L87 Difference]: Start difference. First operand 22386 states and 35944 transitions. Second operand 8 states. [2020-07-21 14:53:12,968 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 14:53:15,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:53:15,977 INFO L93 Difference]: Finished difference Result 35444 states and 56903 transitions. [2020-07-21 14:53:15,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 14:53:15,978 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 502 [2020-07-21 14:53:15,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:53:16,048 INFO L225 Difference]: With dead ends: 35444 [2020-07-21 14:53:16,048 INFO L226 Difference]: Without dead ends: 24750 [2020-07-21 14:53:16,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 495 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-07-21 14:53:16,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24750 states. [2020-07-21 14:53:17,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24750 to 12644. [2020-07-21 14:53:17,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12644 states. [2020-07-21 14:53:17,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12644 states to 12644 states and 20292 transitions. [2020-07-21 14:53:17,385 INFO L78 Accepts]: Start accepts. Automaton has 12644 states and 20292 transitions. Word has length 502 [2020-07-21 14:53:17,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:53:17,385 INFO L479 AbstractCegarLoop]: Abstraction has 12644 states and 20292 transitions. [2020-07-21 14:53:17,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 14:53:17,386 INFO L276 IsEmpty]: Start isEmpty. Operand 12644 states and 20292 transitions. [2020-07-21 14:53:17,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-21 14:53:17,400 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:53:17,401 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:53:17,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:53:17,608 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:53:17,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:53:17,609 INFO L82 PathProgramCache]: Analyzing trace with hash -600161981, now seen corresponding path program 1 times [2020-07-21 14:53:17,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:53:17,610 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [726526216] [2020-07-21 14:53:17,611 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 14:53:18,271 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:53:18,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:53:18,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 3071 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 14:53:18,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:53:18,409 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 14:53:18,410 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:53:18,410 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [726526216] [2020-07-21 14:53:18,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:53:18,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 14:53:18,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032179406] [2020-07-21 14:53:18,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 14:53:18,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:53:18,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 14:53:18,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 14:53:18,412 INFO L87 Difference]: Start difference. First operand 12644 states and 20292 transitions. Second operand 3 states. [2020-07-21 14:53:19,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:53:19,270 INFO L93 Difference]: Finished difference Result 25585 states and 40617 transitions. [2020-07-21 14:53:19,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 14:53:19,272 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-21 14:53:19,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:53:19,297 INFO L225 Difference]: With dead ends: 25585 [2020-07-21 14:53:19,297 INFO L226 Difference]: Without dead ends: 16179 [2020-07-21 14:53:19,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 500 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 14:53:19,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16179 states. [2020-07-21 14:53:19,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16179 to 14001. [2020-07-21 14:53:19,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14001 states. [2020-07-21 14:53:19,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14001 states to 14001 states and 22514 transitions. [2020-07-21 14:53:19,952 INFO L78 Accepts]: Start accepts. Automaton has 14001 states and 22514 transitions. Word has length 502 [2020-07-21 14:53:19,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:53:19,953 INFO L479 AbstractCegarLoop]: Abstraction has 14001 states and 22514 transitions. [2020-07-21 14:53:19,953 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 14:53:19,953 INFO L276 IsEmpty]: Start isEmpty. Operand 14001 states and 22514 transitions. [2020-07-21 14:53:19,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-21 14:53:19,973 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:53:19,973 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:53:20,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:53:20,187 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:53:20,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:53:20,188 INFO L82 PathProgramCache]: Analyzing trace with hash 277201045, now seen corresponding path program 1 times [2020-07-21 14:53:20,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:53:20,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [623470817] [2020-07-21 14:53:20,190 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 14:53:20,840 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:53:20,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:53:20,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 3066 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 14:53:20,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:53:21,382 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 14:53:21,386 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:53:21,386 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [623470817] [2020-07-21 14:53:21,387 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:53:21,387 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 14:53:21,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262370858] [2020-07-21 14:53:21,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 14:53:21,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:53:21,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 14:53:21,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 14:53:21,390 INFO L87 Difference]: Start difference. First operand 14001 states and 22514 transitions. Second operand 3 states. [2020-07-21 14:53:22,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:53:22,803 INFO L93 Difference]: Finished difference Result 41300 states and 66333 transitions. [2020-07-21 14:53:22,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 14:53:22,803 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-21 14:53:22,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:53:22,845 INFO L225 Difference]: With dead ends: 41300 [2020-07-21 14:53:22,845 INFO L226 Difference]: Without dead ends: 27675 [2020-07-21 14:53:22,878 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 500 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 14:53:22,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27675 states. [2020-07-21 14:53:24,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27675 to 27673. [2020-07-21 14:53:24,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27673 states. [2020-07-21 14:53:24,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27673 states to 27673 states and 44319 transitions. [2020-07-21 14:53:24,281 INFO L78 Accepts]: Start accepts. Automaton has 27673 states and 44319 transitions. Word has length 502 [2020-07-21 14:53:24,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:53:24,281 INFO L479 AbstractCegarLoop]: Abstraction has 27673 states and 44319 transitions. [2020-07-21 14:53:24,281 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 14:53:24,281 INFO L276 IsEmpty]: Start isEmpty. Operand 27673 states and 44319 transitions. [2020-07-21 14:53:24,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-21 14:53:24,302 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:53:24,302 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:53:24,502 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:53:24,503 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:53:24,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:53:24,504 INFO L82 PathProgramCache]: Analyzing trace with hash -1729528208, now seen corresponding path program 1 times [2020-07-21 14:53:24,504 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:53:24,505 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1044694226] [2020-07-21 14:53:24,506 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 14:53:24,958 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:53:24,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:53:24,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 1676 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 14:53:24,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:53:25,076 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 14:53:25,076 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:53:25,077 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1044694226] [2020-07-21 14:53:25,077 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:53:25,077 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 14:53:25,077 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983824221] [2020-07-21 14:53:25,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 14:53:25,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:53:25,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 14:53:25,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 14:53:25,078 INFO L87 Difference]: Start difference. First operand 27673 states and 44319 transitions. Second operand 3 states. [2020-07-21 14:53:27,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:53:27,246 INFO L93 Difference]: Finished difference Result 82766 states and 132521 transitions. [2020-07-21 14:53:27,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 14:53:27,247 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-21 14:53:27,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:53:27,334 INFO L225 Difference]: With dead ends: 82766 [2020-07-21 14:53:27,335 INFO L226 Difference]: Without dead ends: 55207 [2020-07-21 14:53:27,378 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 500 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 14:53:27,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55207 states. [2020-07-21 14:53:29,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55207 to 27771. [2020-07-21 14:53:29,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27771 states. [2020-07-21 14:53:29,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27771 states to 27771 states and 44453 transitions. [2020-07-21 14:53:29,834 INFO L78 Accepts]: Start accepts. Automaton has 27771 states and 44453 transitions. Word has length 502 [2020-07-21 14:53:29,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:53:29,834 INFO L479 AbstractCegarLoop]: Abstraction has 27771 states and 44453 transitions. [2020-07-21 14:53:29,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 14:53:29,835 INFO L276 IsEmpty]: Start isEmpty. Operand 27771 states and 44453 transitions. [2020-07-21 14:53:29,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2020-07-21 14:53:29,853 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:53:29,858 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:53:30,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:53:30,073 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:53:30,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:53:30,074 INFO L82 PathProgramCache]: Analyzing trace with hash 1225472698, now seen corresponding path program 1 times [2020-07-21 14:53:30,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:53:30,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [727130416] [2020-07-21 14:53:30,075 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 14:53:30,523 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:53:30,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:53:30,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 1675 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 14:53:30,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:53:30,642 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:53:30,642 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:53:30,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [727130416] [2020-07-21 14:53:30,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:53:30,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 14:53:30,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386454353] [2020-07-21 14:53:30,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 14:53:30,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:53:30,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 14:53:30,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 14:53:30,645 INFO L87 Difference]: Start difference. First operand 27771 states and 44453 transitions. Second operand 3 states. [2020-07-21 14:53:32,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:53:32,971 INFO L93 Difference]: Finished difference Result 82359 states and 131779 transitions. [2020-07-21 14:53:32,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 14:53:32,972 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 503 [2020-07-21 14:53:32,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:53:33,038 INFO L225 Difference]: With dead ends: 82359 [2020-07-21 14:53:33,038 INFO L226 Difference]: Without dead ends: 55079 [2020-07-21 14:53:33,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 501 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 14:53:33,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55079 states. [2020-07-21 14:53:34,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55079 to 27923. [2020-07-21 14:53:34,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27923 states. [2020-07-21 14:53:34,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27923 states to 27923 states and 44677 transitions. [2020-07-21 14:53:34,826 INFO L78 Accepts]: Start accepts. Automaton has 27923 states and 44677 transitions. Word has length 503 [2020-07-21 14:53:34,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:53:34,826 INFO L479 AbstractCegarLoop]: Abstraction has 27923 states and 44677 transitions. [2020-07-21 14:53:34,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 14:53:34,827 INFO L276 IsEmpty]: Start isEmpty. Operand 27923 states and 44677 transitions. [2020-07-21 14:53:34,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2020-07-21 14:53:34,852 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:53:34,852 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:53:35,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:53:35,066 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:53:35,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:53:35,067 INFO L82 PathProgramCache]: Analyzing trace with hash 297843511, now seen corresponding path program 1 times [2020-07-21 14:53:35,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:53:35,068 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [853146158] [2020-07-21 14:53:35,068 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 14:53:35,522 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:53:35,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:53:35,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 1676 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 14:53:35,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:53:35,648 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 14:53:35,648 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:53:35,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [853146158] [2020-07-21 14:53:35,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:53:35,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 14:53:35,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405032188] [2020-07-21 14:53:35,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 14:53:35,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:53:35,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 14:53:35,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 14:53:35,651 INFO L87 Difference]: Start difference. First operand 27923 states and 44677 transitions. Second operand 3 states. [2020-07-21 14:53:38,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:53:38,792 INFO L93 Difference]: Finished difference Result 83368 states and 133388 transitions. [2020-07-21 14:53:38,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 14:53:38,793 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 503 [2020-07-21 14:53:38,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:53:38,859 INFO L225 Difference]: With dead ends: 83368 [2020-07-21 14:53:38,859 INFO L226 Difference]: Without dead ends: 55638 [2020-07-21 14:53:38,894 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 501 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 14:53:38,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55638 states. [2020-07-21 14:53:40,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55638 to 28050. [2020-07-21 14:53:40,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28050 states. [2020-07-21 14:53:40,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28050 states to 28050 states and 44855 transitions. [2020-07-21 14:53:40,691 INFO L78 Accepts]: Start accepts. Automaton has 28050 states and 44855 transitions. Word has length 503 [2020-07-21 14:53:40,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:53:40,692 INFO L479 AbstractCegarLoop]: Abstraction has 28050 states and 44855 transitions. [2020-07-21 14:53:40,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 14:53:40,692 INFO L276 IsEmpty]: Start isEmpty. Operand 28050 states and 44855 transitions. [2020-07-21 14:53:40,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-21 14:53:40,718 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:53:40,719 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:53:40,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:53:40,933 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:53:40,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:53:40,934 INFO L82 PathProgramCache]: Analyzing trace with hash 1956289972, now seen corresponding path program 1 times [2020-07-21 14:53:40,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:53:40,935 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [613238939] [2020-07-21 14:53:40,935 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:53:41,594 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:53:41,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:53:41,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 3068 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 14:53:41,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:53:41,857 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 14:53:41,857 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:53:41,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [613238939] [2020-07-21 14:53:41,858 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:53:41,858 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 14:53:41,858 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598252466] [2020-07-21 14:53:41,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 14:53:41,859 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:53:41,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 14:53:41,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 14:53:41,859 INFO L87 Difference]: Start difference. First operand 28050 states and 44855 transitions. Second operand 3 states. [2020-07-21 14:53:44,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:53:44,839 INFO L93 Difference]: Finished difference Result 81404 states and 129930 transitions. [2020-07-21 14:53:44,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 14:53:44,840 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 504 [2020-07-21 14:53:44,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:53:44,911 INFO L225 Difference]: With dead ends: 81404 [2020-07-21 14:53:44,911 INFO L226 Difference]: Without dead ends: 54898 [2020-07-21 14:53:44,946 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 502 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 14:53:44,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54898 states. [2020-07-21 14:53:48,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54898 to 54896. [2020-07-21 14:53:48,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54896 states. [2020-07-21 14:53:49,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54896 states to 54896 states and 87442 transitions. [2020-07-21 14:53:49,026 INFO L78 Accepts]: Start accepts. Automaton has 54896 states and 87442 transitions. Word has length 504 [2020-07-21 14:53:49,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:53:49,027 INFO L479 AbstractCegarLoop]: Abstraction has 54896 states and 87442 transitions. [2020-07-21 14:53:49,027 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 14:53:49,027 INFO L276 IsEmpty]: Start isEmpty. Operand 54896 states and 87442 transitions. [2020-07-21 14:53:49,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-21 14:53:49,060 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:53:49,061 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:53:49,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:53:49,262 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:53:49,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:53:49,263 INFO L82 PathProgramCache]: Analyzing trace with hash -980640222, now seen corresponding path program 1 times [2020-07-21 14:53:49,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:53:49,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269907058] [2020-07-21 14:53:49,264 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 14:53:49,924 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:53:49,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:53:49,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 3078 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 14:53:49,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:53:50,147 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 14:53:50,147 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:53:50,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269907058] [2020-07-21 14:53:50,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:53:50,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-21 14:53:50,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968356812] [2020-07-21 14:53:50,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 14:53:50,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:53:50,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 14:53:50,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-21 14:53:50,149 INFO L87 Difference]: Start difference. First operand 54896 states and 87442 transitions. Second operand 9 states. [2020-07-21 14:54:13,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:54:13,127 INFO L93 Difference]: Finished difference Result 255090 states and 405903 transitions. [2020-07-21 14:54:13,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 14:54:13,127 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 504 [2020-07-21 14:54:13,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:54:13,435 INFO L225 Difference]: With dead ends: 255090 [2020-07-21 14:54:13,435 INFO L226 Difference]: Without dead ends: 240128 [2020-07-21 14:54:13,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 533 GetRequests, 498 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 375 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=337, Invalid=995, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 14:54:13,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240128 states. [2020-07-21 14:54:21,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240128 to 109528. [2020-07-21 14:54:21,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109528 states. [2020-07-21 14:54:21,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109528 states to 109528 states and 173610 transitions. [2020-07-21 14:54:21,468 INFO L78 Accepts]: Start accepts. Automaton has 109528 states and 173610 transitions. Word has length 504 [2020-07-21 14:54:21,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:54:21,469 INFO L479 AbstractCegarLoop]: Abstraction has 109528 states and 173610 transitions. [2020-07-21 14:54:21,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 14:54:21,469 INFO L276 IsEmpty]: Start isEmpty. Operand 109528 states and 173610 transitions. [2020-07-21 14:54:21,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-21 14:54:21,523 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:54:21,524 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:54:21,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:54:21,725 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:54:21,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:54:21,726 INFO L82 PathProgramCache]: Analyzing trace with hash -2126461271, now seen corresponding path program 1 times [2020-07-21 14:54:21,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:54:21,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [945615131] [2020-07-21 14:54:21,727 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 14:54:22,349 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:54:22,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:54:22,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 3074 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 14:54:22,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:54:22,479 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 14:54:22,479 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:54:22,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [945615131] [2020-07-21 14:54:22,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:54:22,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 14:54:22,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051829479] [2020-07-21 14:54:22,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 14:54:22,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:54:22,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 14:54:22,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 14:54:22,481 INFO L87 Difference]: Start difference. First operand 109528 states and 173610 transitions. Second operand 3 states. [2020-07-21 14:54:33,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:54:33,723 INFO L93 Difference]: Finished difference Result 245060 states and 388632 transitions. [2020-07-21 14:54:33,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 14:54:33,724 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 504 [2020-07-21 14:54:33,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:54:33,945 INFO L225 Difference]: With dead ends: 245060 [2020-07-21 14:54:33,946 INFO L226 Difference]: Without dead ends: 149146 [2020-07-21 14:54:34,039 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 502 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 14:54:34,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149146 states. [2020-07-21 14:54:45,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149146 to 132812. [2020-07-21 14:54:45,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132812 states. [2020-07-21 14:54:46,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132812 states to 132812 states and 211166 transitions. [2020-07-21 14:54:46,107 INFO L78 Accepts]: Start accepts. Automaton has 132812 states and 211166 transitions. Word has length 504 [2020-07-21 14:54:46,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:54:46,107 INFO L479 AbstractCegarLoop]: Abstraction has 132812 states and 211166 transitions. [2020-07-21 14:54:46,108 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 14:54:46,108 INFO L276 IsEmpty]: Start isEmpty. Operand 132812 states and 211166 transitions. [2020-07-21 14:54:46,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-21 14:54:46,161 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:54:46,162 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:54:46,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:54:46,368 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:54:46,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:54:46,369 INFO L82 PathProgramCache]: Analyzing trace with hash 359846569, now seen corresponding path program 1 times [2020-07-21 14:54:46,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:54:46,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [209909467] [2020-07-21 14:54:46,370 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 14:54:47,014 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:54:47,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:54:47,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 3080 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 14:54:47,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:54:47,434 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 14:54:47,434 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:54:47,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [209909467] [2020-07-21 14:54:47,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:54:47,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 14:54:47,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361804346] [2020-07-21 14:54:47,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 14:54:47,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:54:47,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 14:54:47,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-21 14:54:47,436 INFO L87 Difference]: Start difference. First operand 132812 states and 211166 transitions. Second operand 5 states. [2020-07-21 14:55:10,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:55:10,532 INFO L93 Difference]: Finished difference Result 331876 states and 529076 transitions. [2020-07-21 14:55:10,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 14:55:10,533 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 505 [2020-07-21 14:55:10,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:55:10,875 INFO L225 Difference]: With dead ends: 331876 [2020-07-21 14:55:10,875 INFO L226 Difference]: Without dead ends: 248708 [2020-07-21 14:55:10,993 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 501 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-21 14:55:11,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248708 states. [2020-07-21 14:55:32,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248708 to 248706. [2020-07-21 14:55:32,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248706 states. [2020-07-21 14:55:32,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248706 states to 248706 states and 394072 transitions. [2020-07-21 14:55:32,840 INFO L78 Accepts]: Start accepts. Automaton has 248706 states and 394072 transitions. Word has length 505 [2020-07-21 14:55:32,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:55:32,841 INFO L479 AbstractCegarLoop]: Abstraction has 248706 states and 394072 transitions. [2020-07-21 14:55:32,841 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 14:55:32,841 INFO L276 IsEmpty]: Start isEmpty. Operand 248706 states and 394072 transitions. [2020-07-21 14:55:32,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-21 14:55:32,934 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:55:32,935 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:55:33,135 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:55:33,136 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:55:33,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:55:33,137 INFO L82 PathProgramCache]: Analyzing trace with hash -69343826, now seen corresponding path program 1 times [2020-07-21 14:55:33,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:55:33,138 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [837376058] [2020-07-21 14:55:33,138 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 14:55:33,784 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:55:33,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:55:33,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 3081 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 14:55:33,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:55:34,014 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 14:55:34,015 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:55:34,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [837376058] [2020-07-21 14:55:34,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:55:34,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 14:55:34,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503251529] [2020-07-21 14:55:34,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 14:55:34,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:55:34,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 14:55:34,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 14:55:34,017 INFO L87 Difference]: Start difference. First operand 248706 states and 394072 transitions. Second operand 4 states. [2020-07-21 14:56:15,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:56:15,901 INFO L93 Difference]: Finished difference Result 738456 states and 1169898 transitions. [2020-07-21 14:56:15,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 14:56:15,902 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 505 [2020-07-21 14:56:15,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:56:16,582 INFO L225 Difference]: With dead ends: 738456 [2020-07-21 14:56:16,582 INFO L226 Difference]: Without dead ends: 491456 [2020-07-21 14:56:16,789 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 502 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 14:56:17,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 491456 states. [2020-07-21 14:57:08,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 491456 to 491454. [2020-07-21 14:57:08,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 491454 states. [2020-07-21 14:57:09,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491454 states to 491454 states and 776534 transitions. [2020-07-21 14:57:09,014 INFO L78 Accepts]: Start accepts. Automaton has 491454 states and 776534 transitions. Word has length 505 [2020-07-21 14:57:09,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:57:09,014 INFO L479 AbstractCegarLoop]: Abstraction has 491454 states and 776534 transitions. [2020-07-21 14:57:09,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 14:57:09,015 INFO L276 IsEmpty]: Start isEmpty. Operand 491454 states and 776534 transitions. [2020-07-21 14:57:09,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 507 [2020-07-21 14:57:09,187 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:57:09,187 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:57:09,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:57:09,388 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:57:09,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:57:09,389 INFO L82 PathProgramCache]: Analyzing trace with hash -1172872875, now seen corresponding path program 1 times [2020-07-21 14:57:09,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:57:09,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1930782453] [2020-07-21 14:57:09,390 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 14:57:09,855 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:57:09,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:57:09,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 1676 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 14:57:09,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:57:10,798 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 14:57:10,799 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:57:10,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1930782453] [2020-07-21 14:57:10,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:57:10,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 14:57:10,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035268491] [2020-07-21 14:57:10,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 14:57:10,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:57:10,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 14:57:10,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 14:57:10,801 INFO L87 Difference]: Start difference. First operand 491454 states and 776534 transitions. Second operand 4 states. [2020-07-21 14:58:06,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:58:06,021 INFO L93 Difference]: Finished difference Result 1007459 states and 1593058 transitions. [2020-07-21 14:58:06,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 14:58:06,022 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 506 [2020-07-21 14:58:06,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:58:06,771 INFO L225 Difference]: With dead ends: 1007459 [2020-07-21 14:58:06,771 INFO L226 Difference]: Without dead ends: 505533 [2020-07-21 14:58:07,084 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 503 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 14:58:07,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505533 states. [2020-07-21 14:58:57,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505533 to 505531. [2020-07-21 14:58:57,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 505531 states. [2020-07-21 14:58:58,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 505531 states to 505531 states and 797175 transitions. [2020-07-21 14:58:58,264 INFO L78 Accepts]: Start accepts. Automaton has 505531 states and 797175 transitions. Word has length 506 [2020-07-21 14:58:58,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:58:58,264 INFO L479 AbstractCegarLoop]: Abstraction has 505531 states and 797175 transitions. [2020-07-21 14:58:58,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 14:58:58,265 INFO L276 IsEmpty]: Start isEmpty. Operand 505531 states and 797175 transitions. [2020-07-21 14:58:58,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 14:58:58,434 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:58:58,434 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:58:58,646 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:58:58,647 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:58:58,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:58:58,648 INFO L82 PathProgramCache]: Analyzing trace with hash 490851249, now seen corresponding path program 1 times [2020-07-21 14:58:58,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:58:58,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997367573] [2020-07-21 14:58:58,650 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 14:59:00,264 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:59:00,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:59:00,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 3084 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 14:59:00,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:59:00,462 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 14:59:00,462 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:59:00,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997367573] [2020-07-21 14:59:00,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:59:00,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 14:59:00,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931585808] [2020-07-21 14:59:00,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 14:59:00,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:59:00,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 14:59:00,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 14:59:00,464 INFO L87 Difference]: Start difference. First operand 505531 states and 797175 transitions. Second operand 3 states. [2020-07-21 15:00:41,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:00:41,812 INFO L93 Difference]: Finished difference Result 1491837 states and 2351819 transitions. [2020-07-21 15:00:41,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 15:00:41,813 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 507 [2020-07-21 15:00:41,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:00:43,330 INFO L225 Difference]: With dead ends: 1491837 [2020-07-21 15:00:43,330 INFO L226 Difference]: Without dead ends: 993359 [2020-07-21 15:00:44,333 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 505 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 15:00:45,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 993359 states. [2020-07-21 15:02:34,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 993359 to 993357. [2020-07-21 15:02:34,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 993357 states. [2020-07-21 15:02:36,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 993357 states to 993357 states and 1562182 transitions. [2020-07-21 15:02:36,135 INFO L78 Accepts]: Start accepts. Automaton has 993357 states and 1562182 transitions. Word has length 507 [2020-07-21 15:02:36,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:02:36,135 INFO L479 AbstractCegarLoop]: Abstraction has 993357 states and 1562182 transitions. [2020-07-21 15:02:36,135 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 15:02:36,135 INFO L276 IsEmpty]: Start isEmpty. Operand 993357 states and 1562182 transitions. [2020-07-21 15:02:36,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 509 [2020-07-21 15:02:36,472 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:02:36,474 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:02:36,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:02:36,675 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:02:36,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:02:36,676 INFO L82 PathProgramCache]: Analyzing trace with hash 1547199302, now seen corresponding path program 1 times [2020-07-21 15:02:36,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:02:36,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1245291757] [2020-07-21 15:02:36,678 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 15:02:37,127 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:02:37,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:02:37,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 1681 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 15:02:37,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:02:37,267 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 15:02:37,268 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:02:37,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1245291757] [2020-07-21 15:02:37,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:02:37,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 15:02:37,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172482451] [2020-07-21 15:02:37,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 15:02:37,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:02:37,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 15:02:37,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 15:02:37,270 INFO L87 Difference]: Start difference. First operand 993357 states and 1562182 transitions. Second operand 4 states.