/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 17:33:09,234 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 17:33:09,236 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 17:33:09,253 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 17:33:09,253 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 17:33:09,254 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 17:33:09,255 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 17:33:09,257 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 17:33:09,258 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 17:33:09,259 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 17:33:09,260 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 17:33:09,261 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 17:33:09,262 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 17:33:09,262 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 17:33:09,263 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 17:33:09,265 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 17:33:09,265 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 17:33:09,266 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 17:33:09,268 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 17:33:09,270 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 17:33:09,271 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 17:33:09,272 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 17:33:09,273 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 17:33:09,274 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 17:33:09,277 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 17:33:09,277 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 17:33:09,277 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 17:33:09,278 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 17:33:09,278 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 17:33:09,279 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 17:33:09,279 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 17:33:09,280 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 17:33:09,281 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 17:33:09,282 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 17:33:09,283 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 17:33:09,283 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 17:33:09,284 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 17:33:09,284 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 17:33:09,284 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 17:33:09,285 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 17:33:09,285 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 17:33:09,286 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 17:33:09,300 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 17:33:09,301 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 17:33:09,302 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 17:33:09,302 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 17:33:09,302 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 17:33:09,302 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 17:33:09,303 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 17:33:09,303 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 17:33:09,303 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 17:33:09,303 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 17:33:09,303 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 17:33:09,303 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 17:33:09,304 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 17:33:09,304 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 17:33:09,304 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 17:33:09,304 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 17:33:09,304 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 17:33:09,305 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 17:33:09,305 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 17:33:09,305 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 17:33:09,305 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 17:33:09,305 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 17:33:09,306 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 17:33:09,306 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 17:33:09,306 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 17:33:09,306 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 17:33:09,306 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:09,307 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 17:33:09,307 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 17:33:09,307 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 17:33:09,597 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 17:33:09,618 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 17:33:09,622 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 17:33:09,623 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 17:33:09,624 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 17:33:09,626 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-07-21 17:33:09,698 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae99357c8/8517b9cfa2a24499b1bdb8278f370670/FLAG29085c012 [2020-07-21 17:33:10,405 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 17:33:10,407 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-07-21 17:33:10,428 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae99357c8/8517b9cfa2a24499b1bdb8278f370670/FLAG29085c012 [2020-07-21 17:33:10,552 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae99357c8/8517b9cfa2a24499b1bdb8278f370670 [2020-07-21 17:33:10,565 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 17:33:10,568 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 17:33:10,569 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 17:33:10,569 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 17:33:10,574 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 17:33:10,575 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 05:33:10" (1/1) ... [2020-07-21 17:33:10,578 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28b5d4b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:33:10, skipping insertion in model container [2020-07-21 17:33:10,578 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 05:33:10" (1/1) ... [2020-07-21 17:33:10,586 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 17:33:10,786 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 17:33:12,418 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 17:33:12,432 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 17:33:13,607 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 17:33:13,642 INFO L208 MainTranslator]: Completed translation [2020-07-21 17:33:13,643 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:33:13 WrapperNode [2020-07-21 17:33:13,643 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 17:33:13,643 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 17:33:13,644 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 17:33:13,644 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 17:33:13,660 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:33:13" (1/1) ... [2020-07-21 17:33:13,661 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:33:13" (1/1) ... [2020-07-21 17:33:13,717 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:33:13" (1/1) ... [2020-07-21 17:33:13,717 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:33:13" (1/1) ... [2020-07-21 17:33:13,790 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:33:13" (1/1) ... [2020-07-21 17:33:13,838 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:33:13" (1/1) ... [2020-07-21 17:33:13,856 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:33:13" (1/1) ... [2020-07-21 17:33:13,882 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 17:33:13,883 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 17:33:13,883 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 17:33:13,883 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 17:33:13,884 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:33:13" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 17:33:13,962 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 17:33:13,962 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 17:33:13,962 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 17:33:13,963 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 17:33:13,963 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 17:33:13,964 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 17:33:13,965 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-07-21 17:33:13,965 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 17:33:13,965 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-21 17:33:13,966 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 17:33:13,967 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 17:33:13,967 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-21 17:33:13,967 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-21 17:33:13,968 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-21 17:33:13,968 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-21 17:33:13,969 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-21 17:33:13,969 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-21 17:33:13,969 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-21 17:33:13,970 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 17:33:13,970 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-21 17:33:13,970 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 17:33:13,971 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 17:33:13,971 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 17:33:18,499 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 17:33:18,499 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 17:33:18,510 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:33:18 BoogieIcfgContainer [2020-07-21 17:33:18,510 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 17:33:18,512 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 17:33:18,512 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 17:33:18,515 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 17:33:18,515 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 05:33:10" (1/3) ... [2020-07-21 17:33:18,516 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17b14824 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 05:33:18, skipping insertion in model container [2020-07-21 17:33:18,516 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:33:13" (2/3) ... [2020-07-21 17:33:18,516 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17b14824 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 05:33:18, skipping insertion in model container [2020-07-21 17:33:18,517 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:33:18" (3/3) ... [2020-07-21 17:33:18,518 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-07-21 17:33:18,528 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 17:33:18,537 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-07-21 17:33:18,551 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-07-21 17:33:18,582 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 17:33:18,583 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 17:33:18,583 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 17:33:18,583 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 17:33:18,583 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 17:33:18,583 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 17:33:18,583 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 17:33:18,584 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 17:33:18,624 INFO L276 IsEmpty]: Start isEmpty. Operand 1506 states. [2020-07-21 17:33:18,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 494 [2020-07-21 17:33:18,663 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:33:18,665 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] [2020-07-21 17:33:18,666 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:33:18,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:33:18,672 INFO L82 PathProgramCache]: Analyzing trace with hash 1738290825, now seen corresponding path program 1 times [2020-07-21 17:33:18,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:33:18,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1286158439] [2020-07-21 17:33:18,682 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:19,480 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:33:19,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:33:19,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 3066 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 17:33:19,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:33:20,048 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:33:20,049 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:33:20,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1286158439] [2020-07-21 17:33:20,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:33:20,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 17:33:20,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059891188] [2020-07-21 17:33:20,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 17:33:20,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:33:20,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 17:33:20,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 17:33:20,074 INFO L87 Difference]: Start difference. First operand 1506 states. Second operand 4 states. [2020-07-21 17:33:20,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:33:20,482 INFO L93 Difference]: Finished difference Result 4451 states and 8035 transitions. [2020-07-21 17:33:20,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 17:33:20,484 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 493 [2020-07-21 17:33:20,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:33:20,518 INFO L225 Difference]: With dead ends: 4451 [2020-07-21 17:33:20,518 INFO L226 Difference]: Without dead ends: 2958 [2020-07-21 17:33:20,528 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 490 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 17:33:20,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2958 states. [2020-07-21 17:33:20,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2958 to 2937. [2020-07-21 17:33:20,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2937 states. [2020-07-21 17:33:20,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2937 states to 2937 states and 4822 transitions. [2020-07-21 17:33:20,719 INFO L78 Accepts]: Start accepts. Automaton has 2937 states and 4822 transitions. Word has length 493 [2020-07-21 17:33:20,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:33:20,721 INFO L479 AbstractCegarLoop]: Abstraction has 2937 states and 4822 transitions. [2020-07-21 17:33:20,721 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 17:33:20,721 INFO L276 IsEmpty]: Start isEmpty. Operand 2937 states and 4822 transitions. [2020-07-21 17:33:20,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 496 [2020-07-21 17:33:20,737 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:33:20,738 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] [2020-07-21 17:33:20,952 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:20,952 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:33:20,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:33:20,953 INFO L82 PathProgramCache]: Analyzing trace with hash -1411774216, now seen corresponding path program 1 times [2020-07-21 17:33:20,953 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:33:20,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2147280989] [2020-07-21 17:33:20,954 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:21,559 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:33:21,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:33:21,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 3069 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:33:21,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:33:21,824 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:33:21,825 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:33:21,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2147280989] [2020-07-21 17:33:21,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:33:21,825 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:33:21,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31991727] [2020-07-21 17:33:21,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:33:21,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:33:21,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:33:21,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:33:21,829 INFO L87 Difference]: Start difference. First operand 2937 states and 4822 transitions. Second operand 3 states. [2020-07-21 17:33:22,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:33:22,133 INFO L93 Difference]: Finished difference Result 8500 states and 13913 transitions. [2020-07-21 17:33:22,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:33:22,134 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 495 [2020-07-21 17:33:22,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:33:22,164 INFO L225 Difference]: With dead ends: 8500 [2020-07-21 17:33:22,164 INFO L226 Difference]: Without dead ends: 5740 [2020-07-21 17:33:22,172 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 493 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:33:22,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5740 states. [2020-07-21 17:33:22,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5740 to 5721. [2020-07-21 17:33:22,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5721 states. [2020-07-21 17:33:22,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5721 states to 5721 states and 9358 transitions. [2020-07-21 17:33:22,379 INFO L78 Accepts]: Start accepts. Automaton has 5721 states and 9358 transitions. Word has length 495 [2020-07-21 17:33:22,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:33:22,380 INFO L479 AbstractCegarLoop]: Abstraction has 5721 states and 9358 transitions. [2020-07-21 17:33:22,380 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:33:22,381 INFO L276 IsEmpty]: Start isEmpty. Operand 5721 states and 9358 transitions. [2020-07-21 17:33:22,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-21 17:33:22,407 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:33:22,407 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 17:33:22,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:22,623 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:33:22,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:33:22,624 INFO L82 PathProgramCache]: Analyzing trace with hash -622300963, now seen corresponding path program 1 times [2020-07-21 17:33:22,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:33:22,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2092344225] [2020-07-21 17:33:22,624 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:23,191 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:33:23,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:33:23,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 3071 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:33:23,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:33:23,354 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:33:23,354 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:33:23,355 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2092344225] [2020-07-21 17:33:23,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:33:23,355 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:33:23,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982289795] [2020-07-21 17:33:23,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:33:23,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:33:23,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:33:23,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:33:23,358 INFO L87 Difference]: Start difference. First operand 5721 states and 9358 transitions. Second operand 3 states. [2020-07-21 17:33:23,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:33:23,677 INFO L93 Difference]: Finished difference Result 17022 states and 27823 transitions. [2020-07-21 17:33:23,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:33:23,678 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 496 [2020-07-21 17:33:23,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:33:23,739 INFO L225 Difference]: With dead ends: 17022 [2020-07-21 17:33:23,739 INFO L226 Difference]: Without dead ends: 11325 [2020-07-21 17:33:23,755 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 17:33:23,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11325 states. [2020-07-21 17:33:24,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11325 to 5743. [2020-07-21 17:33:24,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5743 states. [2020-07-21 17:33:24,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5743 states to 5743 states and 9393 transitions. [2020-07-21 17:33:24,107 INFO L78 Accepts]: Start accepts. Automaton has 5743 states and 9393 transitions. Word has length 496 [2020-07-21 17:33:24,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:33:24,107 INFO L479 AbstractCegarLoop]: Abstraction has 5743 states and 9393 transitions. [2020-07-21 17:33:24,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:33:24,107 INFO L276 IsEmpty]: Start isEmpty. Operand 5743 states and 9393 transitions. [2020-07-21 17:33:24,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 498 [2020-07-21 17:33:24,121 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:33:24,122 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] [2020-07-21 17:33:24,334 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:24,335 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:33:24,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:33:24,335 INFO L82 PathProgramCache]: Analyzing trace with hash 1955427773, now seen corresponding path program 1 times [2020-07-21 17:33:24,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:33:24,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1892456492] [2020-07-21 17:33:24,336 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:24,857 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:33:24,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:33:24,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 3072 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:33:24,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:33:25,170 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:33:25,170 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:33:25,170 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1892456492] [2020-07-21 17:33:25,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:33:25,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:33:25,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055606469] [2020-07-21 17:33:25,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:33:25,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:33:25,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:33:25,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:33:25,173 INFO L87 Difference]: Start difference. First operand 5743 states and 9393 transitions. Second operand 3 states. [2020-07-21 17:33:25,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:33:25,549 INFO L93 Difference]: Finished difference Result 16664 states and 27179 transitions. [2020-07-21 17:33:25,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:33:25,550 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 497 [2020-07-21 17:33:25,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:33:25,606 INFO L225 Difference]: With dead ends: 16664 [2020-07-21 17:33:25,606 INFO L226 Difference]: Without dead ends: 11218 [2020-07-21 17:33:25,628 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 495 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:33:25,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11218 states. [2020-07-21 17:33:26,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11218 to 11201. [2020-07-21 17:33:26,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11201 states. [2020-07-21 17:33:26,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11201 states to 11201 states and 18242 transitions. [2020-07-21 17:33:26,027 INFO L78 Accepts]: Start accepts. Automaton has 11201 states and 18242 transitions. Word has length 497 [2020-07-21 17:33:26,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:33:26,027 INFO L479 AbstractCegarLoop]: Abstraction has 11201 states and 18242 transitions. [2020-07-21 17:33:26,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:33:26,029 INFO L276 IsEmpty]: Start isEmpty. Operand 11201 states and 18242 transitions. [2020-07-21 17:33:26,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 498 [2020-07-21 17:33:26,059 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:33:26,059 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] [2020-07-21 17:33:26,272 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:26,273 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:33:26,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:33:26,274 INFO L82 PathProgramCache]: Analyzing trace with hash -2028805096, now seen corresponding path program 1 times [2020-07-21 17:33:26,274 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:33:26,274 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [663696566] [2020-07-21 17:33:26,274 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:26,636 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:33:26,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:33:26,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 1699 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:33:26,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:33:27,410 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:33:27,410 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:33:27,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [663696566] [2020-07-21 17:33:27,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:33:27,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:33:27,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482256711] [2020-07-21 17:33:27,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:33:27,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:33:27,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:33:27,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:33:27,413 INFO L87 Difference]: Start difference. First operand 11201 states and 18242 transitions. Second operand 3 states. [2020-07-21 17:33:27,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:33:27,963 INFO L93 Difference]: Finished difference Result 33536 states and 54613 transitions. [2020-07-21 17:33:27,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:33:27,964 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 497 [2020-07-21 17:33:27,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:33:28,021 INFO L225 Difference]: With dead ends: 33536 [2020-07-21 17:33:28,024 INFO L226 Difference]: Without dead ends: 22367 [2020-07-21 17:33:28,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 495 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:33:28,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22367 states. [2020-07-21 17:33:28,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22367 to 11233. [2020-07-21 17:33:28,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11233 states. [2020-07-21 17:33:28,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11233 states to 11233 states and 18290 transitions. [2020-07-21 17:33:28,627 INFO L78 Accepts]: Start accepts. Automaton has 11233 states and 18290 transitions. Word has length 497 [2020-07-21 17:33:28,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:33:28,627 INFO L479 AbstractCegarLoop]: Abstraction has 11233 states and 18290 transitions. [2020-07-21 17:33:28,628 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:33:28,628 INFO L276 IsEmpty]: Start isEmpty. Operand 11233 states and 18290 transitions. [2020-07-21 17:33:28,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 499 [2020-07-21 17:33:28,649 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:33:28,649 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 17:33:28,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:28,863 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:33:28,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:33:28,863 INFO L82 PathProgramCache]: Analyzing trace with hash 254900089, now seen corresponding path program 1 times [2020-07-21 17:33:28,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:33:28,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [317789143] [2020-07-21 17:33:28,865 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:29,184 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:33:29,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:33:29,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 1699 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 17:33:29,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:33:29,291 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:33:29,291 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:33:29,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [317789143] [2020-07-21 17:33:29,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:33:29,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 17:33:29,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092503264] [2020-07-21 17:33:29,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 17:33:29,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:33:29,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 17:33:29,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 17:33:29,293 INFO L87 Difference]: Start difference. First operand 11233 states and 18290 transitions. Second operand 4 states. [2020-07-21 17:33:29,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:33:29,898 INFO L93 Difference]: Finished difference Result 32285 states and 52300 transitions. [2020-07-21 17:33:29,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 17:33:29,898 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 498 [2020-07-21 17:33:29,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:33:29,951 INFO L225 Difference]: With dead ends: 32285 [2020-07-21 17:33:29,952 INFO L226 Difference]: Without dead ends: 22079 [2020-07-21 17:33:29,977 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 495 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 17:33:30,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22079 states. [2020-07-21 17:33:30,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22079 to 12025. [2020-07-21 17:33:30,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12025 states. [2020-07-21 17:33:30,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12025 states to 12025 states and 19724 transitions. [2020-07-21 17:33:30,512 INFO L78 Accepts]: Start accepts. Automaton has 12025 states and 19724 transitions. Word has length 498 [2020-07-21 17:33:30,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:33:30,513 INFO L479 AbstractCegarLoop]: Abstraction has 12025 states and 19724 transitions. [2020-07-21 17:33:30,513 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 17:33:30,513 INFO L276 IsEmpty]: Start isEmpty. Operand 12025 states and 19724 transitions. [2020-07-21 17:33:30,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 499 [2020-07-21 17:33:30,535 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:33:30,535 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:33:30,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:30,749 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:33:30,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:33:30,750 INFO L82 PathProgramCache]: Analyzing trace with hash 915762038, now seen corresponding path program 1 times [2020-07-21 17:33:30,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:33:30,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [480520562] [2020-07-21 17:33:30,751 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:31,260 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:33:31,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:33:31,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 3074 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:33:31,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:33:31,485 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:33:31,485 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:33:31,485 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [480520562] [2020-07-21 17:33:31,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:33:31,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:33:31,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979732186] [2020-07-21 17:33:31,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:33:31,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:33:31,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:33:31,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:33:31,487 INFO L87 Difference]: Start difference. First operand 12025 states and 19724 transitions. Second operand 3 states. [2020-07-21 17:33:32,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:33:32,019 INFO L93 Difference]: Finished difference Result 35967 states and 58991 transitions. [2020-07-21 17:33:32,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:33:32,019 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 498 [2020-07-21 17:33:32,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:33:32,067 INFO L225 Difference]: With dead ends: 35967 [2020-07-21 17:33:32,067 INFO L226 Difference]: Without dead ends: 23968 [2020-07-21 17:33:32,100 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 17:33:32,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23968 states. [2020-07-21 17:33:32,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23968 to 12073. [2020-07-21 17:33:32,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12073 states. [2020-07-21 17:33:32,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12073 states to 12073 states and 19795 transitions. [2020-07-21 17:33:32,731 INFO L78 Accepts]: Start accepts. Automaton has 12073 states and 19795 transitions. Word has length 498 [2020-07-21 17:33:32,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:33:32,731 INFO L479 AbstractCegarLoop]: Abstraction has 12073 states and 19795 transitions. [2020-07-21 17:33:32,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:33:32,732 INFO L276 IsEmpty]: Start isEmpty. Operand 12073 states and 19795 transitions. [2020-07-21 17:33:32,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-21 17:33:32,752 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:33:32,753 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 17:33:32,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:32,966 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:33:32,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:33:32,967 INFO L82 PathProgramCache]: Analyzing trace with hash 412960354, now seen corresponding path program 1 times [2020-07-21 17:33:32,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:33:32,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [873073620] [2020-07-21 17:33:32,969 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:33,470 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:33:33,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:33:33,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 3075 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:33:33,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:33:33,707 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:33:33,708 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:33:33,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [873073620] [2020-07-21 17:33:33,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:33:33,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:33:33,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373364314] [2020-07-21 17:33:33,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:33:33,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:33:33,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:33:33,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:33:33,710 INFO L87 Difference]: Start difference. First operand 12073 states and 19795 transitions. Second operand 3 states. [2020-07-21 17:33:34,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:33:34,470 INFO L93 Difference]: Finished difference Result 34039 states and 55500 transitions. [2020-07-21 17:33:34,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:33:34,472 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 499 [2020-07-21 17:33:34,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:33:34,509 INFO L225 Difference]: With dead ends: 34039 [2020-07-21 17:33:34,510 INFO L226 Difference]: Without dead ends: 23173 [2020-07-21 17:33:34,531 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 17:33:34,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23173 states. [2020-07-21 17:33:35,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23173 to 23158. [2020-07-21 17:33:35,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23158 states. [2020-07-21 17:33:35,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23158 states to 23158 states and 37741 transitions. [2020-07-21 17:33:35,287 INFO L78 Accepts]: Start accepts. Automaton has 23158 states and 37741 transitions. Word has length 499 [2020-07-21 17:33:35,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:33:35,288 INFO L479 AbstractCegarLoop]: Abstraction has 23158 states and 37741 transitions. [2020-07-21 17:33:35,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:33:35,288 INFO L276 IsEmpty]: Start isEmpty. Operand 23158 states and 37741 transitions. [2020-07-21 17:33:35,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-21 17:33:35,317 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:33:35,317 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:33:35,525 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:35,526 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:33:35,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:33:35,528 INFO L82 PathProgramCache]: Analyzing trace with hash 1364424112, now seen corresponding path program 1 times [2020-07-21 17:33:35,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:33:35,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2046984416] [2020-07-21 17:33:35,529 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:35,876 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:33:35,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:33:35,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 1713 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 17:33:35,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:33:36,309 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:33:36,309 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:33:36,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2046984416] [2020-07-21 17:33:36,314 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:33:36,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-21 17:33:36,315 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170050781] [2020-07-21 17:33:36,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 17:33:36,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:33:36,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 17:33:36,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-21 17:33:36,317 INFO L87 Difference]: Start difference. First operand 23158 states and 37741 transitions. Second operand 9 states. [2020-07-21 17:33:47,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:33:47,613 INFO L93 Difference]: Finished difference Result 128157 states and 205543 transitions. [2020-07-21 17:33:47,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 17:33:47,613 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 499 [2020-07-21 17:33:47,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:33:47,772 INFO L225 Difference]: With dead ends: 128157 [2020-07-21 17:33:47,772 INFO L226 Difference]: Without dead ends: 124213 [2020-07-21 17:33:47,810 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 493 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 425 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=370, Invalid=1112, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 17:33:47,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124213 states. [2020-07-21 17:33:49,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124213 to 50774. [2020-07-21 17:33:49,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50774 states. [2020-07-21 17:33:50,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50774 states to 50774 states and 81781 transitions. [2020-07-21 17:33:50,039 INFO L78 Accepts]: Start accepts. Automaton has 50774 states and 81781 transitions. Word has length 499 [2020-07-21 17:33:50,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:33:50,039 INFO L479 AbstractCegarLoop]: Abstraction has 50774 states and 81781 transitions. [2020-07-21 17:33:50,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 17:33:50,040 INFO L276 IsEmpty]: Start isEmpty. Operand 50774 states and 81781 transitions. [2020-07-21 17:33:50,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-21 17:33:50,074 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:33:50,074 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 17:33:50,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:50,287 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:33:50,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:33:50,288 INFO L82 PathProgramCache]: Analyzing trace with hash -1166271041, now seen corresponding path program 1 times [2020-07-21 17:33:50,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:33:50,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [870005301] [2020-07-21 17:33:50,290 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:50,794 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:33:50,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:33:50,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 3085 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 17:33:50,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:33:52,085 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:33:52,085 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:33:52,085 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [870005301] [2020-07-21 17:33:52,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:33:52,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 17:33:52,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698589564] [2020-07-21 17:33:52,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 17:33:52,087 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:33:52,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 17:33:52,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-21 17:33:52,087 INFO L87 Difference]: Start difference. First operand 50774 states and 81781 transitions. Second operand 8 states. [2020-07-21 17:33:56,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:33:56,831 INFO L93 Difference]: Finished difference Result 79774 states and 128348 transitions. [2020-07-21 17:33:56,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 17:33:56,831 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 499 [2020-07-21 17:33:56,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:33:56,896 INFO L225 Difference]: With dead ends: 79774 [2020-07-21 17:33:56,897 INFO L226 Difference]: Without dead ends: 57162 [2020-07-21 17:33:56,930 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 492 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-07-21 17:33:56,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57162 states. [2020-07-21 17:33:58,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57162 to 31234. [2020-07-21 17:33:58,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31234 states. [2020-07-21 17:33:58,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31234 states to 31234 states and 50313 transitions. [2020-07-21 17:33:58,679 INFO L78 Accepts]: Start accepts. Automaton has 31234 states and 50313 transitions. Word has length 499 [2020-07-21 17:33:58,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:33:58,679 INFO L479 AbstractCegarLoop]: Abstraction has 31234 states and 50313 transitions. [2020-07-21 17:33:58,679 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 17:33:58,679 INFO L276 IsEmpty]: Start isEmpty. Operand 31234 states and 50313 transitions. [2020-07-21 17:33:58,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-21 17:33:58,708 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:33:58,709 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 17:33:58,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:58,923 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:33:58,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:33:58,924 INFO L82 PathProgramCache]: Analyzing trace with hash -1819502602, now seen corresponding path program 1 times [2020-07-21 17:33:58,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:33:58,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [91469235] [2020-07-21 17:33:58,925 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:33:59,425 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:33:59,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:33:59,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 3081 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:33:59,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:33:59,575 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:33:59,575 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:33:59,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [91469235] [2020-07-21 17:33:59,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:33:59,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:33:59,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063987365] [2020-07-21 17:33:59,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:33:59,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:33:59,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:33:59,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:33:59,579 INFO L87 Difference]: Start difference. First operand 31234 states and 50313 transitions. Second operand 3 states. [2020-07-21 17:34:01,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:34:01,402 INFO L93 Difference]: Finished difference Result 58332 states and 93110 transitions. [2020-07-21 17:34:01,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:34:01,402 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 499 [2020-07-21 17:34:01,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:34:01,435 INFO L225 Difference]: With dead ends: 58332 [2020-07-21 17:34:01,436 INFO L226 Difference]: Without dead ends: 36260 [2020-07-21 17:34:01,457 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 17:34:01,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36260 states. [2020-07-21 17:34:02,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36260 to 34074. [2020-07-21 17:34:02,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34074 states. [2020-07-21 17:34:02,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34074 states to 34074 states and 55081 transitions. [2020-07-21 17:34:02,961 INFO L78 Accepts]: Start accepts. Automaton has 34074 states and 55081 transitions. Word has length 499 [2020-07-21 17:34:02,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:34:02,961 INFO L479 AbstractCegarLoop]: Abstraction has 34074 states and 55081 transitions. [2020-07-21 17:34:02,961 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:34:02,961 INFO L276 IsEmpty]: Start isEmpty. Operand 34074 states and 55081 transitions. [2020-07-21 17:34:02,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-21 17:34:02,981 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:34:02,981 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] [2020-07-21 17:34:03,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:34:03,182 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:34:03,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:34:03,184 INFO L82 PathProgramCache]: Analyzing trace with hash -776016586, now seen corresponding path program 1 times [2020-07-21 17:34:03,184 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:34:03,184 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924434045] [2020-07-21 17:34:03,185 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:34:03,703 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:34:03,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:34:03,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 3084 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:34:03,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:34:04,899 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:34:04,899 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:34:04,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924434045] [2020-07-21 17:34:04,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:34:04,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:34:04,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876471118] [2020-07-21 17:34:04,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:34:04,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:34:04,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:34:04,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:34:04,903 INFO L87 Difference]: Start difference. First operand 34074 states and 55081 transitions. Second operand 3 states. [2020-07-21 17:34:07,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:34:07,257 INFO L93 Difference]: Finished difference Result 74664 states and 119794 transitions. [2020-07-21 17:34:07,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:34:07,257 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 501 [2020-07-21 17:34:07,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:34:07,313 INFO L225 Difference]: With dead ends: 74664 [2020-07-21 17:34:07,314 INFO L226 Difference]: Without dead ends: 50144 [2020-07-21 17:34:07,349 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 499 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:34:07,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50144 states. [2020-07-21 17:34:09,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50144 to 43726. [2020-07-21 17:34:09,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43726 states. [2020-07-21 17:34:09,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43726 states to 43726 states and 70805 transitions. [2020-07-21 17:34:09,607 INFO L78 Accepts]: Start accepts. Automaton has 43726 states and 70805 transitions. Word has length 501 [2020-07-21 17:34:09,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:34:09,607 INFO L479 AbstractCegarLoop]: Abstraction has 43726 states and 70805 transitions. [2020-07-21 17:34:09,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:34:09,607 INFO L276 IsEmpty]: Start isEmpty. Operand 43726 states and 70805 transitions. [2020-07-21 17:34:09,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-21 17:34:09,627 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:34:09,628 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 17:34:09,828 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:34:09,829 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:34:09,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:34:09,830 INFO L82 PathProgramCache]: Analyzing trace with hash 55258184, now seen corresponding path program 1 times [2020-07-21 17:34:09,830 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:34:09,831 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1498409096] [2020-07-21 17:34:09,831 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:34:10,172 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:34:10,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:34:10,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 1705 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:34:10,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:34:10,482 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:34:10,482 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:34:10,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1498409096] [2020-07-21 17:34:10,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:34:10,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:34:10,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825056088] [2020-07-21 17:34:10,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:34:10,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:34:10,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:34:10,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:34:10,485 INFO L87 Difference]: Start difference. First operand 43726 states and 70805 transitions. Second operand 3 states. [2020-07-21 17:34:14,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:34:14,679 INFO L93 Difference]: Finished difference Result 125336 states and 201681 transitions. [2020-07-21 17:34:14,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:34:14,680 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-21 17:34:14,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:34:14,772 INFO L225 Difference]: With dead ends: 125336 [2020-07-21 17:34:14,773 INFO L226 Difference]: Without dead ends: 84538 [2020-07-21 17:34:14,812 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 17:34:14,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84538 states. [2020-07-21 17:34:18,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84538 to 44150. [2020-07-21 17:34:18,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44150 states. [2020-07-21 17:34:18,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44150 states to 44150 states and 71442 transitions. [2020-07-21 17:34:18,920 INFO L78 Accepts]: Start accepts. Automaton has 44150 states and 71442 transitions. Word has length 502 [2020-07-21 17:34:18,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:34:18,920 INFO L479 AbstractCegarLoop]: Abstraction has 44150 states and 71442 transitions. [2020-07-21 17:34:18,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:34:18,921 INFO L276 IsEmpty]: Start isEmpty. Operand 44150 states and 71442 transitions. [2020-07-21 17:34:18,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-21 17:34:18,942 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:34:18,942 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 17:34:19,143 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:34:19,144 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:34:19,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:34:19,145 INFO L82 PathProgramCache]: Analyzing trace with hash -1055408279, now seen corresponding path program 1 times [2020-07-21 17:34:19,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:34:19,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [297785733] [2020-07-21 17:34:19,146 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:34:19,644 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:34:19,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:34:19,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 3091 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 17:34:19,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:34:19,848 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:34:19,848 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:34:19,849 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [297785733] [2020-07-21 17:34:19,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:34:19,849 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 17:34:19,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218932621] [2020-07-21 17:34:19,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 17:34:19,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:34:19,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 17:34:19,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 17:34:19,850 INFO L87 Difference]: Start difference. First operand 44150 states and 71442 transitions. Second operand 4 states. [2020-07-21 17:34:25,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:34:25,072 INFO L93 Difference]: Finished difference Result 130843 states and 211614 transitions. [2020-07-21 17:34:25,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 17:34:25,073 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 502 [2020-07-21 17:34:25,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:34:25,154 INFO L225 Difference]: With dead ends: 130843 [2020-07-21 17:34:25,154 INFO L226 Difference]: Without dead ends: 87176 [2020-07-21 17:34:25,187 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 499 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 17:34:25,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87176 states. [2020-07-21 17:34:32,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87176 to 86284. [2020-07-21 17:34:32,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86284 states. [2020-07-21 17:34:32,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86284 states to 86284 states and 139129 transitions. [2020-07-21 17:34:32,177 INFO L78 Accepts]: Start accepts. Automaton has 86284 states and 139129 transitions. Word has length 502 [2020-07-21 17:34:32,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:34:32,178 INFO L479 AbstractCegarLoop]: Abstraction has 86284 states and 139129 transitions. [2020-07-21 17:34:32,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 17:34:32,178 INFO L276 IsEmpty]: Start isEmpty. Operand 86284 states and 139129 transitions. [2020-07-21 17:34:32,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-21 17:34:32,219 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:34:32,219 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:34:32,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:34:32,421 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:34:32,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:34:32,422 INFO L82 PathProgramCache]: Analyzing trace with hash 1607172727, now seen corresponding path program 1 times [2020-07-21 17:34:32,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:34:32,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [668984472] [2020-07-21 17:34:32,423 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:34:32,742 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:34:32,742 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:34:32,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 1721 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 17:34:32,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:34:32,919 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:34:32,919 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:34:32,919 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [668984472] [2020-07-21 17:34:32,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:34:32,920 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-21 17:34:32,920 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261230442] [2020-07-21 17:34:32,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 17:34:32,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:34:32,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 17:34:32,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-21 17:34:32,921 INFO L87 Difference]: Start difference. First operand 86284 states and 139129 transitions. Second operand 9 states. [2020-07-21 17:35:10,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:35:10,321 INFO L93 Difference]: Finished difference Result 446709 states and 717357 transitions. [2020-07-21 17:35:10,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 17:35:10,322 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 504 [2020-07-21 17:35:10,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:35:10,912 INFO L225 Difference]: With dead ends: 446709 [2020-07-21 17:35:10,912 INFO L226 Difference]: Without dead ends: 420257 [2020-07-21 17:35:11,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 533 GetRequests, 498 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=337, Invalid=995, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 17:35:11,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 420257 states. [2020-07-21 17:35:30,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 420257 to 193190. [2020-07-21 17:35:30,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193190 states. [2020-07-21 17:35:31,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193190 states to 193190 states and 311407 transitions. [2020-07-21 17:35:31,052 INFO L78 Accepts]: Start accepts. Automaton has 193190 states and 311407 transitions. Word has length 504 [2020-07-21 17:35:31,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:35:31,053 INFO L479 AbstractCegarLoop]: Abstraction has 193190 states and 311407 transitions. [2020-07-21 17:35:31,053 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 17:35:31,053 INFO L276 IsEmpty]: Start isEmpty. Operand 193190 states and 311407 transitions. [2020-07-21 17:35:31,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-21 17:35:31,108 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:35:31,108 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 17:35:31,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:35:31,309 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:35:31,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:35:31,311 INFO L82 PathProgramCache]: Analyzing trace with hash -464098460, now seen corresponding path program 1 times [2020-07-21 17:35:31,311 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:35:31,312 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [816940502] [2020-07-21 17:35:31,312 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:35:31,812 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:35:31,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:35:31,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 3093 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 17:35:31,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:35:32,095 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:35:32,096 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:35:32,096 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [816940502] [2020-07-21 17:35:32,096 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:35:32,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 17:35:32,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120887961] [2020-07-21 17:35:32,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 17:35:32,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:35:32,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 17:35:32,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-21 17:35:32,098 INFO L87 Difference]: Start difference. First operand 193190 states and 311407 transitions. Second operand 8 states. [2020-07-21 17:35:59,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:35:59,228 INFO L93 Difference]: Finished difference Result 369671 states and 594335 transitions. [2020-07-21 17:35:59,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 17:35:59,229 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 504 [2020-07-21 17:35:59,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:35:59,619 INFO L225 Difference]: With dead ends: 369671 [2020-07-21 17:35:59,619 INFO L226 Difference]: Without dead ends: 298673 [2020-07-21 17:35:59,706 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 511 GetRequests, 497 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-07-21 17:35:59,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298673 states. [2020-07-21 17:36:11,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298673 to 127630. [2020-07-21 17:36:11,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127630 states. [2020-07-21 17:36:12,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127630 states to 127630 states and 205639 transitions. [2020-07-21 17:36:12,156 INFO L78 Accepts]: Start accepts. Automaton has 127630 states and 205639 transitions. Word has length 504 [2020-07-21 17:36:12,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:12,156 INFO L479 AbstractCegarLoop]: Abstraction has 127630 states and 205639 transitions. [2020-07-21 17:36:12,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 17:36:12,157 INFO L276 IsEmpty]: Start isEmpty. Operand 127630 states and 205639 transitions. [2020-07-21 17:36:12,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-21 17:36:12,203 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:12,203 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:36:12,403 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:12,404 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:12,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:12,404 INFO L82 PathProgramCache]: Analyzing trace with hash -1007979451, now seen corresponding path program 1 times [2020-07-21 17:36:12,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:12,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2055527398] [2020-07-21 17:36:12,405 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:12,907 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:36:12,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:12,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 3089 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:36:12,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:13,113 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:13,114 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:13,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2055527398] [2020-07-21 17:36:13,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:13,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:36:13,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913661377] [2020-07-21 17:36:13,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:36:13,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:13,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:36:13,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:13,116 INFO L87 Difference]: Start difference. First operand 127630 states and 205639 transitions. Second operand 3 states. [2020-07-21 17:36:34,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:36:34,570 INFO L93 Difference]: Finished difference Result 377857 states and 608305 transitions. [2020-07-21 17:36:34,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:36:34,571 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 504 [2020-07-21 17:36:34,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:36:34,859 INFO L225 Difference]: With dead ends: 377857 [2020-07-21 17:36:34,859 INFO L226 Difference]: Without dead ends: 252146 [2020-07-21 17:36:34,958 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 17:36:35,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252146 states. [2020-07-21 17:36:59,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252146 to 250888. [2020-07-21 17:36:59,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 250888 states. [2020-07-21 17:36:59,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250888 states to 250888 states and 402854 transitions. [2020-07-21 17:36:59,733 INFO L78 Accepts]: Start accepts. Automaton has 250888 states and 402854 transitions. Word has length 504 [2020-07-21 17:36:59,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:59,733 INFO L479 AbstractCegarLoop]: Abstraction has 250888 states and 402854 transitions. [2020-07-21 17:36:59,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:36:59,734 INFO L276 IsEmpty]: Start isEmpty. Operand 250888 states and 402854 transitions. [2020-07-21 17:36:59,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-21 17:36:59,833 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:59,833 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 17:37:00,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:37:00,034 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:37:00,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:37:00,035 INFO L82 PathProgramCache]: Analyzing trace with hash -2134566731, now seen corresponding path program 1 times [2020-07-21 17:37:00,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:37:00,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [371885041] [2020-07-21 17:37:00,036 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:37:00,540 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:37:00,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:37:00,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 3091 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:37:00,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:37:00,649 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:37:00,650 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:37:00,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [371885041] [2020-07-21 17:37:00,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:37:00,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:37:00,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545149027] [2020-07-21 17:37:00,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:37:00,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:37:00,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:37:00,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:37:00,652 INFO L87 Difference]: Start difference. First operand 250888 states and 402854 transitions. Second operand 3 states. [2020-07-21 17:37:45,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:37:45,544 INFO L93 Difference]: Finished difference Result 747917 states and 1200046 transitions. [2020-07-21 17:37:45,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:37:45,545 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 505 [2020-07-21 17:37:45,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:37:46,130 INFO L225 Difference]: With dead ends: 747917 [2020-07-21 17:37:46,130 INFO L226 Difference]: Without dead ends: 499034 [2020-07-21 17:37:46,308 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 503 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:37:46,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 499034 states. [2020-07-21 17:38:14,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 499034 to 250888. [2020-07-21 17:38:14,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 250888 states. [2020-07-21 17:38:14,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250888 states to 250888 states and 402842 transitions. [2020-07-21 17:38:14,849 INFO L78 Accepts]: Start accepts. Automaton has 250888 states and 402842 transitions. Word has length 505 [2020-07-21 17:38:14,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:38:14,849 INFO L479 AbstractCegarLoop]: Abstraction has 250888 states and 402842 transitions. [2020-07-21 17:38:14,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:38:14,849 INFO L276 IsEmpty]: Start isEmpty. Operand 250888 states and 402842 transitions. [2020-07-21 17:38:14,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 507 [2020-07-21 17:38:14,965 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:38:14,965 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:38:15,166 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:38:15,167 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:38:15,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:38:15,168 INFO L82 PathProgramCache]: Analyzing trace with hash 2057347968, now seen corresponding path program 1 times [2020-07-21 17:38:15,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:38:15,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1148930726] [2020-07-21 17:38:15,169 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:38:16,175 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:38:16,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:38:16,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 3092 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:38:16,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:38:16,299 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:38:16,300 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:38:16,300 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1148930726] [2020-07-21 17:38:16,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:38:16,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:38:16,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647634765] [2020-07-21 17:38:16,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:38:16,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:38:16,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:38:16,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:38:16,302 INFO L87 Difference]: Start difference. First operand 250888 states and 402842 transitions. Second operand 3 states. [2020-07-21 17:38:51,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:38:51,434 INFO L93 Difference]: Finished difference Result 553200 states and 888729 transitions. [2020-07-21 17:38:51,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:38:51,434 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 506 [2020-07-21 17:38:51,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:38:51,846 INFO L225 Difference]: With dead ends: 553200 [2020-07-21 17:38:51,846 INFO L226 Difference]: Without dead ends: 342706 [2020-07-21 17:38:51,992 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 504 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:38:52,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342706 states. [2020-07-21 17:39:28,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342706 to 327064. [2020-07-21 17:39:28,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327064 states. [2020-07-21 17:39:28,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327064 states to 327064 states and 525578 transitions. [2020-07-21 17:39:28,897 INFO L78 Accepts]: Start accepts. Automaton has 327064 states and 525578 transitions. Word has length 506 [2020-07-21 17:39:28,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:39:28,897 INFO L479 AbstractCegarLoop]: Abstraction has 327064 states and 525578 transitions. [2020-07-21 17:39:28,897 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:39:28,897 INFO L276 IsEmpty]: Start isEmpty. Operand 327064 states and 525578 transitions. [2020-07-21 17:39:28,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 507 [2020-07-21 17:39:28,986 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:39:28,987 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 17:39:29,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:39:29,196 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:39:29,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:39:29,197 INFO L82 PathProgramCache]: Analyzing trace with hash -1287300791, now seen corresponding path program 1 times [2020-07-21 17:39:29,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:39:29,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [173341790] [2020-07-21 17:39:29,198 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:39:30,100 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:39:30,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:39:30,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 1707 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 17:39:30,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:39:30,229 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:39:30,229 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:39:30,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [173341790] [2020-07-21 17:39:30,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:39:30,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 17:39:30,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273204211] [2020-07-21 17:39:30,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 17:39:30,231 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:39:30,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 17:39:30,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 17:39:30,231 INFO L87 Difference]: Start difference. First operand 327064 states and 525578 transitions. Second operand 4 states. [2020-07-21 17:40:34,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:40:34,271 INFO L93 Difference]: Finished difference Result 934978 states and 1496035 transitions. [2020-07-21 17:40:34,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 17:40:34,272 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 506 [2020-07-21 17:40:34,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:40:35,140 INFO L225 Difference]: With dead ends: 934978 [2020-07-21 17:40:35,140 INFO L226 Difference]: Without dead ends: 630740 [2020-07-21 17:40:35,385 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 17:40:36,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 630740 states. [2020-07-21 17:41:17,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 630740 to 336112. [2020-07-21 17:41:17,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 336112 states. [2020-07-21 17:41:18,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336112 states to 336112 states and 541750 transitions. [2020-07-21 17:41:18,368 INFO L78 Accepts]: Start accepts. Automaton has 336112 states and 541750 transitions. Word has length 506 [2020-07-21 17:41:18,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:41:18,369 INFO L479 AbstractCegarLoop]: Abstraction has 336112 states and 541750 transitions. [2020-07-21 17:41:18,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 17:41:18,369 INFO L276 IsEmpty]: Start isEmpty. Operand 336112 states and 541750 transitions. [2020-07-21 17:41:18,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 507 [2020-07-21 17:41:18,470 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:41:18,470 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 17:41:18,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:41:18,678 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:41:18,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:41:18,679 INFO L82 PathProgramCache]: Analyzing trace with hash 342341501, now seen corresponding path program 1 times [2020-07-21 17:41:18,680 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:41:18,680 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2091071842] [2020-07-21 17:41:18,680 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:41:19,185 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:41:19,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:41:19,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 3097 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:41:19,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:41:19,390 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:41:19,390 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:41:19,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2091071842] [2020-07-21 17:41:19,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:41:19,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:41:19,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912146654] [2020-07-21 17:41:19,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:41:19,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:41:19,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:41:19,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:41:19,392 INFO L87 Difference]: Start difference. First operand 336112 states and 541750 transitions. Second operand 3 states. [2020-07-21 17:42:28,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:42:28,356 INFO L93 Difference]: Finished difference Result 991605 states and 1597386 transitions. [2020-07-21 17:42:28,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:42:28,357 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 506 [2020-07-21 17:42:28,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:42:29,235 INFO L225 Difference]: With dead ends: 991605 [2020-07-21 17:42:29,236 INFO L226 Difference]: Without dead ends: 658177 [2020-07-21 17:42:29,517 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 504 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:42:29,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 658177 states. [2020-07-21 17:43:51,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 658177 to 656991. [2020-07-21 17:43:51,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 656991 states. [2020-07-21 17:43:52,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 656991 states to 656991 states and 1054385 transitions. [2020-07-21 17:43:52,730 INFO L78 Accepts]: Start accepts. Automaton has 656991 states and 1054385 transitions. Word has length 506 [2020-07-21 17:43:52,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:43:52,730 INFO L479 AbstractCegarLoop]: Abstraction has 656991 states and 1054385 transitions. [2020-07-21 17:43:52,730 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:43:52,730 INFO L276 IsEmpty]: Start isEmpty. Operand 656991 states and 1054385 transitions. [2020-07-21 17:43:52,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 507 [2020-07-21 17:43:52,984 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:43:52,984 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 17:43:53,184 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:43:53,185 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:43:53,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:43:53,186 INFO L82 PathProgramCache]: Analyzing trace with hash -479041598, now seen corresponding path program 1 times [2020-07-21 17:43:53,186 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:43:53,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [962054609] [2020-07-21 17:43:53,187 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:43:54,553 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:43:54,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:43:54,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 1717 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:43:54,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:43:54,715 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:43:54,715 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:43:54,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [962054609] [2020-07-21 17:43:54,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:43:54,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:43:54,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169811157] [2020-07-21 17:43:54,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:43:54,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:43:54,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:43:54,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:43:54,717 INFO L87 Difference]: Start difference. First operand 656991 states and 1054385 transitions. Second operand 3 states.