/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_8.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 06:33:05,276 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 06:33:05,277 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 06:33:05,312 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 06:33:05,331 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 06:33:05,332 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 06:33:05,333 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 06:33:05,334 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 06:33:05,335 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 06:33:05,335 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 06:33:05,339 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 06:33:05,342 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 06:33:05,343 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 06:33:05,344 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 06:33:05,346 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 06:33:05,347 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 06:33:05,348 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 06:33:05,353 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 06:33:05,353 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 06:33:05,354 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 06:33:05,358 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 06:33:05,367 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 06:33:05,367 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 06:33:05,369 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 06:33:05,370 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 06:33:05,370 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 06:33:05,370 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 06:33:05,370 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 06:33:05,370 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 06:33:05,370 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 06:33:05,370 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 06:33:05,371 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 06:33:05,371 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 06:33:05,371 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 06:33:05,371 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 06:33:05,371 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 06:33:05,371 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 06:33:05,371 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 06:33:05,371 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 06:33:05,371 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 06:33:05,372 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 06:33:05,372 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 06:33:05,372 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 06:33:05,372 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 06:33:05,649 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 06:33:05,670 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 06:33:05,673 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 06:33:05,674 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 06:33:05,674 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 06:33:05,675 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_8.c [2021-05-06 06:33:05,736 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bb6af9184/5ce0e591f2bb44e984e47686334f54b6/FLAGa82b9538f [2021-05-06 06:33:06,121 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 06:33:06,122 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_8.c [2021-05-06 06:33:06,126 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bb6af9184/5ce0e591f2bb44e984e47686334f54b6/FLAGa82b9538f [2021-05-06 06:33:06,553 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bb6af9184/5ce0e591f2bb44e984e47686334f54b6 [2021-05-06 06:33:06,555 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 06:33:06,557 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 06:33:06,560 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 06:33:06,560 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 06:33:06,563 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 06:33:06,564 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 06:33:06" (1/1) ... [2021-05-06 06:33:06,565 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@425d93c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:33:06, skipping insertion in model container [2021-05-06 06:33:06,566 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 06:33:06" (1/1) ... [2021-05-06 06:33:06,572 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 06:33:06,583 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 06:33:06,672 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_8.c[318,331] [2021-05-06 06:33:06,683 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 06:33:06,690 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 06:33:06,698 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_8.c[318,331] [2021-05-06 06:33:06,701 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 06:33:06,719 INFO L208 MainTranslator]: Completed translation [2021-05-06 06:33:06,720 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:33:06 WrapperNode [2021-05-06 06:33:06,720 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 06:33:06,720 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 06:33:06,721 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 06:33:06,721 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 06:33:06,740 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:33:06" (1/1) ... [2021-05-06 06:33:06,741 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:33:06" (1/1) ... [2021-05-06 06:33:06,751 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:33:06" (1/1) ... [2021-05-06 06:33:06,751 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:33:06" (1/1) ... [2021-05-06 06:33:06,769 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:33:06" (1/1) ... [2021-05-06 06:33:06,771 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:33:06" (1/1) ... [2021-05-06 06:33:06,772 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:33:06" (1/1) ... [2021-05-06 06:33:06,773 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 06:33:06,773 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 06:33:06,773 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 06:33:06,773 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 06:33:06,774 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:33:06" (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 [2021-05-06 06:33:06,899 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 06:33:06,900 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 06:33:06,900 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 06:33:06,900 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 06:33:06,900 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 06:33:06,900 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 06:33:06,900 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 06:33:06,901 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 06:33:06,901 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 06:33:06,901 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 06:33:06,902 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 06:33:06,902 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 06:33:06,902 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 06:33:06,902 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 06:33:06,902 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 06:33:06,903 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 06:33:06,903 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 06:33:07,137 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 06:33:07,137 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 06:33:07,138 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:33:07 BoogieIcfgContainer [2021-05-06 06:33:07,138 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 06:33:07,139 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 06:33:07,139 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 06:33:07,139 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 06:33:07,141 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:33:07" (1/1) ... [2021-05-06 06:33:07,149 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 06:33:07 BasicIcfg [2021-05-06 06:33:07,149 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 06:33:07,150 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 06:33:07,150 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 06:33:07,152 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 06:33:07,152 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 06:33:06" (1/4) ... [2021-05-06 06:33:07,153 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61ab6afa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 06:33:07, skipping insertion in model container [2021-05-06 06:33:07,153 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:33:06" (2/4) ... [2021-05-06 06:33:07,153 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61ab6afa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 06:33:07, skipping insertion in model container [2021-05-06 06:33:07,153 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:33:07" (3/4) ... [2021-05-06 06:33:07,153 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61ab6afa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 06:33:07, skipping insertion in model container [2021-05-06 06:33:07,153 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 06:33:07" (4/4) ... [2021-05-06 06:33:07,154 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_8.cJordan [2021-05-06 06:33:07,158 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 06:33:07,160 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 06:33:07,170 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 06:33:07,190 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 06:33:07,190 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 06:33:07,190 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 06:33:07,190 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 06:33:07,190 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 06:33:07,190 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 06:33:07,190 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 06:33:07,191 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 06:33:07,201 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 06:33:07,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 06:33:07,207 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:07,208 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:07,208 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:07,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:07,212 INFO L82 PathProgramCache]: Analyzing trace with hash 447419557, now seen corresponding path program 1 times [2021-05-06 06:33:07,219 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:07,219 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103028359] [2021-05-06 06:33:07,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:07,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:07,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:07,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:07,381 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:33:07,381 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:07,381 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103028359] [2021-05-06 06:33:07,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [103028359] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 06:33:07,382 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 06:33:07,382 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 06:33:07,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793042544] [2021-05-06 06:33:07,387 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 06:33:07,387 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:07,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 06:33:07,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 06:33:07,399 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:07,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:07,431 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2021-05-06 06:33:07,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 06:33:07,433 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 06:33:07,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:07,439 INFO L225 Difference]: With dead ends: 21 [2021-05-06 06:33:07,439 INFO L226 Difference]: Without dead ends: 14 [2021-05-06 06:33:07,440 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 28.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 06:33:07,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-06 06:33:07,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-06 06:33:07,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:07,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-06 06:33:07,464 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-06 06:33:07,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:07,465 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-06 06:33:07,465 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:07,465 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-06 06:33:07,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 06:33:07,466 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:07,466 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:07,466 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 06:33:07,466 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:07,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:07,467 INFO L82 PathProgramCache]: Analyzing trace with hash 448343078, now seen corresponding path program 1 times [2021-05-06 06:33:07,467 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:07,468 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157735818] [2021-05-06 06:33:07,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:07,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:07,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:07,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:07,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:33:07,582 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:07,582 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157735818] [2021-05-06 06:33:07,582 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1157735818] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 06:33:07,583 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 06:33:07,583 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 06:33:07,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443300162] [2021-05-06 06:33:07,584 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 06:33:07,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:07,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 06:33:07,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 06:33:07,585 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:07,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:07,658 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-05-06 06:33:07,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 06:33:07,659 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 06:33:07,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:07,660 INFO L225 Difference]: With dead ends: 17 [2021-05-06 06:33:07,660 INFO L226 Difference]: Without dead ends: 17 [2021-05-06 06:33:07,660 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 68.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 06:33:07,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-06 06:33:07,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-06 06:33:07,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:07,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-06 06:33:07,664 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-05-06 06:33:07,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:07,664 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-06 06:33:07,664 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:07,664 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-06 06:33:07,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 06:33:07,665 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:07,665 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:07,665 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 06:33:07,665 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:07,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:07,666 INFO L82 PathProgramCache]: Analyzing trace with hash -1516694440, now seen corresponding path program 1 times [2021-05-06 06:33:07,666 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:07,666 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202439095] [2021-05-06 06:33:07,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:07,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:07,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:07,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:07,808 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:33:07,808 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:07,808 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202439095] [2021-05-06 06:33:07,808 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [202439095] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:07,808 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770955023] [2021-05-06 06:33:07,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:07,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:07,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-06 06:33:07,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:07,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:08,012 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:33:08,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770955023] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:08,012 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:08,012 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 7 [2021-05-06 06:33:08,014 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369479889] [2021-05-06 06:33:08,015 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 06:33:08,015 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:08,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 06:33:08,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-06 06:33:08,018 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:08,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:08,109 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2021-05-06 06:33:08,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 06:33:08,110 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-06 06:33:08,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:08,111 INFO L225 Difference]: With dead ends: 20 [2021-05-06 06:33:08,112 INFO L226 Difference]: Without dead ends: 20 [2021-05-06 06:33:08,112 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 119.0ms TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-05-06 06:33:08,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-06 06:33:08,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-06 06:33:08,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:08,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-06 06:33:08,118 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-06 06:33:08,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:08,118 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-06 06:33:08,118 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:08,118 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-06 06:33:08,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 06:33:08,119 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:08,119 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:08,333 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-06 06:33:08,333 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:08,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:08,334 INFO L82 PathProgramCache]: Analyzing trace with hash -1545148698, now seen corresponding path program 2 times [2021-05-06 06:33:08,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:08,334 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172050659] [2021-05-06 06:33:08,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:08,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:08,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:08,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:08,477 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:33:08,477 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:08,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172050659] [2021-05-06 06:33:08,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172050659] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:08,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1913145548] [2021-05-06 06:33:08,477 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:08,598 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:33:08,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:33:08,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 06:33:08,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:08,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:08,683 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:33:08,683 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1913145548] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:08,683 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:08,683 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 9 [2021-05-06 06:33:08,683 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011272288] [2021-05-06 06:33:08,683 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 06:33:08,684 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:08,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 06:33:08,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-05-06 06:33:08,684 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:08,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:08,814 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2021-05-06 06:33:08,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 06:33:08,814 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-06 06:33:08,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:08,816 INFO L225 Difference]: With dead ends: 23 [2021-05-06 06:33:08,816 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 06:33:08,817 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 164.7ms TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-05-06 06:33:08,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 06:33:08,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-06 06:33:08,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:08,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-06 06:33:08,822 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2021-05-06 06:33:08,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:08,822 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-06 06:33:08,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:08,822 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-06 06:33:08,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 06:33:08,823 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:08,823 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:09,039 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:09,040 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:09,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:09,040 INFO L82 PathProgramCache]: Analyzing trace with hash 1177575832, now seen corresponding path program 3 times [2021-05-06 06:33:09,040 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:09,040 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2102547746] [2021-05-06 06:33:09,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:09,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:09,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:09,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:09,217 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:33:09,217 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:09,217 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2102547746] [2021-05-06 06:33:09,218 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2102547746] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:09,218 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [345488465] [2021-05-06 06:33:09,218 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:09,303 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-06 06:33:09,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:33:09,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 06:33:09,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:09,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:09,441 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-06 06:33:09,441 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [345488465] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:09,441 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:09,442 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 11 [2021-05-06 06:33:09,443 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198610306] [2021-05-06 06:33:09,444 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 06:33:09,444 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:09,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 06:33:09,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-06 06:33:09,445 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:09,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:09,964 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2021-05-06 06:33:09,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 06:33:09,964 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-06 06:33:09,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:09,965 INFO L225 Difference]: With dead ends: 33 [2021-05-06 06:33:09,965 INFO L226 Difference]: Without dead ends: 33 [2021-05-06 06:33:09,965 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 539.6ms TimeCoverageRelationStatistics Valid=100, Invalid=242, Unknown=0, NotChecked=0, Total=342 [2021-05-06 06:33:09,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-06 06:33:09,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2021-05-06 06:33:09,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:09,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-05-06 06:33:09,967 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 20 [2021-05-06 06:33:09,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:09,967 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-05-06 06:33:09,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:09,968 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-05-06 06:33:09,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 06:33:09,968 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:09,968 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:10,196 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:10,197 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:10,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:10,197 INFO L82 PathProgramCache]: Analyzing trace with hash -657264347, now seen corresponding path program 1 times [2021-05-06 06:33:10,198 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:10,198 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1810238366] [2021-05-06 06:33:10,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:10,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:10,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:10,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:10,312 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:33:10,313 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:10,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1810238366] [2021-05-06 06:33:10,313 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1810238366] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:10,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449457381] [2021-05-06 06:33:10,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:10,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:10,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 06:33:10,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:10,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:10,427 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:33:10,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449457381] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:10,428 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:10,428 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-06 06:33:10,428 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904438331] [2021-05-06 06:33:10,428 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 06:33:10,428 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:10,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 06:33:10,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-06 06:33:10,429 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:10,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:10,714 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2021-05-06 06:33:10,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 06:33:10,715 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-06 06:33:10,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:10,715 INFO L225 Difference]: With dead ends: 34 [2021-05-06 06:33:10,715 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 06:33:10,716 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 232.5ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-06 06:33:10,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 06:33:10,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-06 06:33:10,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:10,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-05-06 06:33:10,719 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 29 [2021-05-06 06:33:10,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:10,719 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-05-06 06:33:10,719 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:10,719 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-05-06 06:33:10,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-06 06:33:10,720 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:10,720 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:10,938 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:10,939 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:10,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:10,939 INFO L82 PathProgramCache]: Analyzing trace with hash -1647316777, now seen corresponding path program 2 times [2021-05-06 06:33:10,939 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:10,939 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941999992] [2021-05-06 06:33:10,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:10,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:11,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:11,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:11,085 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:33:11,085 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:11,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941999992] [2021-05-06 06:33:11,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941999992] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:11,086 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1201101522] [2021-05-06 06:33:11,086 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:11,145 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:33:11,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:33:11,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 06:33:11,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:11,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:11,230 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:33:11,230 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1201101522] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:11,230 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:11,231 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-06 06:33:11,231 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512530709] [2021-05-06 06:33:11,231 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 06:33:11,231 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:11,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 06:33:11,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-06 06:33:11,232 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:11,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:11,548 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2021-05-06 06:33:11,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 06:33:11,549 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-06 06:33:11,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:11,549 INFO L225 Difference]: With dead ends: 37 [2021-05-06 06:33:11,549 INFO L226 Difference]: Without dead ends: 37 [2021-05-06 06:33:11,550 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 287.5ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-06 06:33:11,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-06 06:33:11,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2021-05-06 06:33:11,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:11,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-05-06 06:33:11,552 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 32 [2021-05-06 06:33:11,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:11,552 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-05-06 06:33:11,552 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:11,552 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-05-06 06:33:11,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 06:33:11,553 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:11,553 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:11,768 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-06 06:33:11,768 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:11,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:11,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1536130021, now seen corresponding path program 3 times [2021-05-06 06:33:11,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:11,769 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234022006] [2021-05-06 06:33:11,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:11,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:11,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:11,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:11,915 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 15 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:33:11,916 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:11,916 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234022006] [2021-05-06 06:33:11,916 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1234022006] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:11,916 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230255245] [2021-05-06 06:33:11,916 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:11,992 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 06:33:11,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:33:11,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-06 06:33:11,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:12,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:12,179 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 33 proven. 2 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-06 06:33:12,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1230255245] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:12,180 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:12,180 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 16 [2021-05-06 06:33:12,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83581517] [2021-05-06 06:33:12,180 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 06:33:12,180 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:12,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 06:33:12,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-06 06:33:12,181 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 16 states, 16 states have (on average 2.625) internal successors, (42), 15 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:13,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:13,078 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-05-06 06:33:13,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 06:33:13,079 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.625) internal successors, (42), 15 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-06 06:33:13,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:13,079 INFO L225 Difference]: With dead ends: 48 [2021-05-06 06:33:13,079 INFO L226 Difference]: Without dead ends: 48 [2021-05-06 06:33:13,080 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 823.3ms TimeCoverageRelationStatistics Valid=178, Invalid=692, Unknown=0, NotChecked=0, Total=870 [2021-05-06 06:33:13,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-06 06:33:13,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-06 06:33:13,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 41 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:13,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2021-05-06 06:33:13,082 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 35 [2021-05-06 06:33:13,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:13,082 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2021-05-06 06:33:13,082 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.625) internal successors, (42), 15 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:13,082 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2021-05-06 06:33:13,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 06:33:13,083 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:13,083 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:13,288 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:13,289 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:13,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:13,289 INFO L82 PathProgramCache]: Analyzing trace with hash 993036856, now seen corresponding path program 4 times [2021-05-06 06:33:13,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:13,290 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [277194385] [2021-05-06 06:33:13,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:13,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:13,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:13,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:13,420 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 48 proven. 126 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 06:33:13,420 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:13,420 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [277194385] [2021-05-06 06:33:13,420 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [277194385] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:13,420 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807496752] [2021-05-06 06:33:13,420 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:13,462 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:33:13,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:33:13,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-06 06:33:13,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:13,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:13,554 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 48 proven. 126 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 06:33:13,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [807496752] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:13,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:13,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-06 06:33:13,556 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206889165] [2021-05-06 06:33:13,556 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 06:33:13,556 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:13,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 06:33:13,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-06 06:33:13,557 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:13,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:13,994 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2021-05-06 06:33:13,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 06:33:13,995 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-06 06:33:13,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:13,996 INFO L225 Difference]: With dead ends: 50 [2021-05-06 06:33:13,996 INFO L226 Difference]: Without dead ends: 50 [2021-05-06 06:33:13,996 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 344.2ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-06 06:33:13,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-06 06:33:13,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-05-06 06:33:13,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:13,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2021-05-06 06:33:14,000 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 44 [2021-05-06 06:33:14,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:14,000 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2021-05-06 06:33:14,000 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:14,000 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2021-05-06 06:33:14,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 06:33:14,001 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:14,001 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:14,216 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:14,217 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:14,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:14,217 INFO L82 PathProgramCache]: Analyzing trace with hash -2111705018, now seen corresponding path program 5 times [2021-05-06 06:33:14,217 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:14,217 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2054496334] [2021-05-06 06:33:14,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:14,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:14,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:14,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:14,384 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 53 proven. 155 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 06:33:14,385 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:14,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2054496334] [2021-05-06 06:33:14,385 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2054496334] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:14,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1564905403] [2021-05-06 06:33:14,385 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:14,531 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-05-06 06:33:14,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:33:14,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-06 06:33:14,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:14,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:14,673 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 53 proven. 155 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 06:33:14,673 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1564905403] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:14,673 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:14,673 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-06 06:33:14,674 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860624804] [2021-05-06 06:33:14,674 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 06:33:14,674 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:14,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 06:33:14,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-06 06:33:14,674 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:15,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:15,160 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2021-05-06 06:33:15,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 06:33:15,161 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-06 06:33:15,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:15,162 INFO L225 Difference]: With dead ends: 53 [2021-05-06 06:33:15,162 INFO L226 Difference]: Without dead ends: 53 [2021-05-06 06:33:15,162 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 40 SyntacticMatches, 10 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 438.3ms TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2021-05-06 06:33:15,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-06 06:33:15,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-05-06 06:33:15,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.0638297872340425) internal successors, (50), 47 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:15,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2021-05-06 06:33:15,164 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 47 [2021-05-06 06:33:15,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:15,165 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2021-05-06 06:33:15,165 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:15,165 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2021-05-06 06:33:15,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 06:33:15,165 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:15,165 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:15,366 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 06:33:15,366 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:15,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:15,366 INFO L82 PathProgramCache]: Analyzing trace with hash 938813304, now seen corresponding path program 6 times [2021-05-06 06:33:15,366 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:15,366 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1315635021] [2021-05-06 06:33:15,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:15,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:15,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:15,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:15,549 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 58 proven. 187 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 06:33:15,549 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:15,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1315635021] [2021-05-06 06:33:15,550 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1315635021] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:15,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075432439] [2021-05-06 06:33:15,550 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:15,671 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-05-06 06:33:15,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:33:15,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 06:33:15,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:15,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:15,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:15,850 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 85 proven. 7 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-06 06:33:15,850 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075432439] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:15,850 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:15,850 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 7] total 20 [2021-05-06 06:33:15,850 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229660638] [2021-05-06 06:33:15,850 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 06:33:15,851 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:15,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 06:33:15,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2021-05-06 06:33:15,851 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand has 20 states, 20 states have (on average 2.95) internal successors, (59), 19 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:17,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:17,284 INFO L93 Difference]: Finished difference Result 69 states and 74 transitions. [2021-05-06 06:33:17,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 06:33:17,284 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.95) internal successors, (59), 19 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-06 06:33:17,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:17,285 INFO L225 Difference]: With dead ends: 69 [2021-05-06 06:33:17,285 INFO L226 Difference]: Without dead ends: 69 [2021-05-06 06:33:17,286 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 1390.6ms TimeCoverageRelationStatistics Valid=363, Invalid=1359, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 06:33:17,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-06 06:33:17,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 60. [2021-05-06 06:33:17,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 55 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:17,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2021-05-06 06:33:17,289 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 50 [2021-05-06 06:33:17,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:17,289 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2021-05-06 06:33:17,289 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.95) internal successors, (59), 19 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:17,289 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2021-05-06 06:33:17,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 06:33:17,290 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:17,290 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:17,492 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:17,493 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:17,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:17,493 INFO L82 PathProgramCache]: Analyzing trace with hash -1269919931, now seen corresponding path program 7 times [2021-05-06 06:33:17,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:17,493 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [46880774] [2021-05-06 06:33:17,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:17,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:17,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:17,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:17,689 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 109 proven. 260 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-06 06:33:17,689 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:17,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [46880774] [2021-05-06 06:33:17,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [46880774] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:17,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [89177760] [2021-05-06 06:33:17,689 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:17,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:17,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-06 06:33:17,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:17,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:17,832 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 109 proven. 260 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-06 06:33:17,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [89177760] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:17,833 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:17,833 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-06 06:33:17,833 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827780413] [2021-05-06 06:33:17,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 06:33:17,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:17,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 06:33:17,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-06 06:33:17,834 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:18,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:18,494 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2021-05-06 06:33:18,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 06:33:18,495 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-06 06:33:18,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:18,495 INFO L225 Difference]: With dead ends: 64 [2021-05-06 06:33:18,495 INFO L226 Difference]: Without dead ends: 64 [2021-05-06 06:33:18,496 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 486.2ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-06 06:33:18,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-06 06:33:18,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-06 06:33:18,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:18,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2021-05-06 06:33:18,498 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 59 [2021-05-06 06:33:18,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:18,499 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2021-05-06 06:33:18,499 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:18,499 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2021-05-06 06:33:18,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 06:33:18,499 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:18,499 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:18,719 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:18,719 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:18,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:18,720 INFO L82 PathProgramCache]: Analyzing trace with hash 27167607, now seen corresponding path program 8 times [2021-05-06 06:33:18,720 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:18,720 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646360928] [2021-05-06 06:33:18,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:18,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:18,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:18,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:18,947 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 117 proven. 301 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-06 06:33:18,947 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:18,947 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646360928] [2021-05-06 06:33:18,947 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [646360928] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:18,947 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44646832] [2021-05-06 06:33:18,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:18,988 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:33:18,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:33:18,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-06 06:33:18,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:19,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:19,090 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 117 proven. 301 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-06 06:33:19,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [44646832] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:19,090 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:19,091 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-06 06:33:19,091 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416577517] [2021-05-06 06:33:19,091 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 06:33:19,091 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:19,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 06:33:19,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-06 06:33:19,092 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:19,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:19,808 INFO L93 Difference]: Finished difference Result 67 states and 69 transitions. [2021-05-06 06:33:19,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 06:33:19,808 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-06 06:33:19,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:19,809 INFO L225 Difference]: With dead ends: 67 [2021-05-06 06:33:19,809 INFO L226 Difference]: Without dead ends: 67 [2021-05-06 06:33:19,809 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 519.8ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 06:33:19,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-06 06:33:19,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2021-05-06 06:33:19,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.0491803278688525) internal successors, (64), 61 states have internal predecessors, (64), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:19,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2021-05-06 06:33:19,812 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 62 [2021-05-06 06:33:19,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:19,812 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2021-05-06 06:33:19,812 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:19,812 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2021-05-06 06:33:19,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 06:33:19,813 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:19,813 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 15, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:20,021 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-06 06:33:20,021 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:20,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:20,021 INFO L82 PathProgramCache]: Analyzing trace with hash -258749947, now seen corresponding path program 9 times [2021-05-06 06:33:20,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:20,021 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394221547] [2021-05-06 06:33:20,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:20,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:20,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:20,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:20,257 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 125 proven. 345 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-06 06:33:20,257 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:20,257 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394221547] [2021-05-06 06:33:20,257 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1394221547] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:20,257 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1154158091] [2021-05-06 06:33:20,257 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:20,342 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-05-06 06:33:20,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:33:20,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-06 06:33:20,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:20,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:20,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:20,859 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 161 proven. 29 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2021-05-06 06:33:20,859 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1154158091] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:20,859 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:20,859 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 10] total 27 [2021-05-06 06:33:20,859 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594437922] [2021-05-06 06:33:20,860 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 06:33:20,860 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:20,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 06:33:20,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=622, Unknown=0, NotChecked=0, Total=702 [2021-05-06 06:33:20,860 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand has 27 states, 27 states have (on average 2.814814814814815) internal successors, (76), 26 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:22,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:22,690 INFO L93 Difference]: Finished difference Result 79 states and 81 transitions. [2021-05-06 06:33:22,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 06:33:22,690 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.814814814814815) internal successors, (76), 26 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-06 06:33:22,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:22,691 INFO L225 Difference]: With dead ends: 79 [2021-05-06 06:33:22,691 INFO L226 Difference]: Without dead ends: 79 [2021-05-06 06:33:22,691 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 55 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 1750.0ms TimeCoverageRelationStatistics Valid=385, Invalid=2267, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 06:33:22,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-06 06:33:22,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2021-05-06 06:33:22,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 73 states have internal predecessors, (76), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:22,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2021-05-06 06:33:22,694 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 65 [2021-05-06 06:33:22,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:22,694 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2021-05-06 06:33:22,694 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.814814814814815) internal successors, (76), 26 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:22,695 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2021-05-06 06:33:22,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 06:33:22,695 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:22,695 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 17, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:22,898 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-06 06:33:22,899 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:22,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:22,899 INFO L82 PathProgramCache]: Analyzing trace with hash -629616667, now seen corresponding path program 10 times [2021-05-06 06:33:22,899 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:22,899 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1690290463] [2021-05-06 06:33:22,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:22,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:23,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:23,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:23,181 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 247 proven. 442 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-06 06:33:23,181 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:23,181 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1690290463] [2021-05-06 06:33:23,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1690290463] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:23,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [205635030] [2021-05-06 06:33:23,182 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:23,225 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:33:23,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:33:23,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-06 06:33:23,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:23,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:23,416 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 157 proven. 551 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-06 06:33:23,416 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [205635030] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:23,416 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:23,417 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 22] total 24 [2021-05-06 06:33:23,417 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128182798] [2021-05-06 06:33:23,417 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 06:33:23,417 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:23,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 06:33:23,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=489, Unknown=0, NotChecked=0, Total=552 [2021-05-06 06:33:23,418 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:24,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:24,461 INFO L93 Difference]: Finished difference Result 88 states and 90 transitions. [2021-05-06 06:33:24,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 06:33:24,461 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-06 06:33:24,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:24,462 INFO L225 Difference]: With dead ends: 88 [2021-05-06 06:33:24,462 INFO L226 Difference]: Without dead ends: 88 [2021-05-06 06:33:24,462 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 750.7ms TimeCoverageRelationStatistics Valid=161, Invalid=1731, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 06:33:24,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-06 06:33:24,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2021-05-06 06:33:24,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:24,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2021-05-06 06:33:24,471 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 77 [2021-05-06 06:33:24,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:24,471 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2021-05-06 06:33:24,471 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:24,471 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2021-05-06 06:33:24,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-06 06:33:24,472 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:24,472 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 20, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:24,676 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-06 06:33:24,677 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:24,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:24,677 INFO L82 PathProgramCache]: Analyzing trace with hash -1225269033, now seen corresponding path program 11 times [2021-05-06 06:33:24,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:24,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486897102] [2021-05-06 06:33:24,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:24,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:25,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:25,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:25,021 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 289 proven. 610 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-06 06:33:25,021 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:25,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486897102] [2021-05-06 06:33:25,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [486897102] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:25,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708950187] [2021-05-06 06:33:25,021 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:29,501 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 26 check-sat command(s) [2021-05-06 06:33:29,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:33:29,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 63 conjunts are in the unsatisfiable core [2021-05-06 06:33:29,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:29,842 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 289 proven. 610 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-06 06:33:29,842 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1708950187] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:29,842 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:29,843 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-06 06:33:29,843 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528736320] [2021-05-06 06:33:29,843 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 06:33:29,843 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:29,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 06:33:29,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-06 06:33:29,843 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:31,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:31,077 INFO L93 Difference]: Finished difference Result 91 states and 93 transitions. [2021-05-06 06:33:31,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 06:33:31,077 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2021-05-06 06:33:31,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:31,078 INFO L225 Difference]: With dead ends: 91 [2021-05-06 06:33:31,078 INFO L226 Difference]: Without dead ends: 91 [2021-05-06 06:33:31,078 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 72 SyntacticMatches, 17 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 1081.5ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 06:33:31,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-06 06:33:31,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2021-05-06 06:33:31,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 85 states have (on average 1.035294117647059) internal successors, (88), 85 states have internal predecessors, (88), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:31,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2021-05-06 06:33:31,080 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 86 [2021-05-06 06:33:31,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:31,081 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2021-05-06 06:33:31,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:31,081 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2021-05-06 06:33:31,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-06 06:33:31,081 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:31,081 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 21, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:31,286 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:31,286 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:31,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:31,287 INFO L82 PathProgramCache]: Analyzing trace with hash 1549653349, now seen corresponding path program 12 times [2021-05-06 06:33:31,287 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:31,287 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [264875210] [2021-05-06 06:33:31,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:31,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:31,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:31,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:31,641 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 303 proven. 672 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-06 06:33:31,641 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:31,641 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [264875210] [2021-05-06 06:33:31,641 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [264875210] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:31,641 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231437800] [2021-05-06 06:33:31,641 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:32,198 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-06 06:33:32,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:33:32,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-06 06:33:32,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:32,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:32,660 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 40 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2021-05-06 06:33:32,660 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231437800] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:32,660 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:32,660 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 11] total 34 [2021-05-06 06:33:32,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59182619] [2021-05-06 06:33:32,660 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 06:33:32,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:32,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 06:33:32,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 06:33:32,661 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand has 34 states, 34 states have (on average 2.8823529411764706) internal successors, (98), 33 states have internal predecessors, (98), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:37,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:37,347 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2021-05-06 06:33:37,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 06:33:37,347 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.8823529411764706) internal successors, (98), 33 states have internal predecessors, (98), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-06 06:33:37,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:37,349 INFO L225 Difference]: With dead ends: 114 [2021-05-06 06:33:37,349 INFO L226 Difference]: Without dead ends: 114 [2021-05-06 06:33:37,350 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 777 ImplicationChecksByTransitivity, 4512.7ms TimeCoverageRelationStatistics Valid=798, Invalid=4604, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 06:33:37,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-05-06 06:33:37,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 100. [2021-05-06 06:33:37,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 95 states have (on average 1.0315789473684212) internal successors, (98), 95 states have internal predecessors, (98), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:37,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 102 transitions. [2021-05-06 06:33:37,352 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 102 transitions. Word has length 89 [2021-05-06 06:33:37,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:37,353 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 102 transitions. [2021-05-06 06:33:37,353 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.8823529411764706) internal successors, (98), 33 states have internal predecessors, (98), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:37,353 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 102 transitions. [2021-05-06 06:33:37,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-06 06:33:37,353 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:37,353 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 23, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:37,561 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-06 06:33:37,561 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:37,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:37,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1810149192, now seen corresponding path program 13 times [2021-05-06 06:33:37,562 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:37,562 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [357258298] [2021-05-06 06:33:37,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:37,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:37,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:37,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:37,938 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 402 proven. 805 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 06:33:37,938 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:37,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [357258298] [2021-05-06 06:33:37,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [357258298] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:37,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [801694240] [2021-05-06 06:33:37,938 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:37,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:38,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-06 06:33:38,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:38,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:38,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 402 proven. 805 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 06:33:38,149 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [801694240] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:38,149 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:38,149 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-06 06:33:38,149 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175370923] [2021-05-06 06:33:38,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 06:33:38,149 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:38,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 06:33:38,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-06 06:33:38,150 INFO L87 Difference]: Start difference. First operand 100 states and 102 transitions. Second operand has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:39,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:39,500 INFO L93 Difference]: Finished difference Result 104 states and 106 transitions. [2021-05-06 06:33:39,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 06:33:39,500 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2021-05-06 06:33:39,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:39,501 INFO L225 Difference]: With dead ends: 104 [2021-05-06 06:33:39,501 INFO L226 Difference]: Without dead ends: 104 [2021-05-06 06:33:39,501 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 977.8ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 06:33:39,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-06 06:33:39,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2021-05-06 06:33:39,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:39,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-06 06:33:39,503 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 98 [2021-05-06 06:33:39,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:39,504 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-06 06:33:39,504 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:39,504 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-06 06:33:39,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 06:33:39,504 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:39,504 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 24, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:39,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-06 06:33:39,717 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:39,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:39,717 INFO L82 PathProgramCache]: Analyzing trace with hash 2028003398, now seen corresponding path program 14 times [2021-05-06 06:33:39,718 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:39,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [642859356] [2021-05-06 06:33:39,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:39,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:40,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:40,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:40,141 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 419 proven. 876 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 06:33:40,141 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:40,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [642859356] [2021-05-06 06:33:40,142 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [642859356] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:40,142 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [180435515] [2021-05-06 06:33:40,142 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:40,202 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:33:40,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:33:40,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-06 06:33:40,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:40,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:40,350 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 419 proven. 876 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 06:33:40,351 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [180435515] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:40,351 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:40,351 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-06 06:33:40,351 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665127208] [2021-05-06 06:33:40,351 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 06:33:40,351 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:40,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 06:33:40,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-06 06:33:40,352 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 28 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:41,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:41,824 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2021-05-06 06:33:41,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 06:33:41,825 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 28 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-06 06:33:41,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:41,825 INFO L225 Difference]: With dead ends: 107 [2021-05-06 06:33:41,825 INFO L226 Difference]: Without dead ends: 107 [2021-05-06 06:33:41,826 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 1064.2ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 06:33:41,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-06 06:33:41,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2021-05-06 06:33:41,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0297029702970297) internal successors, (104), 101 states have internal predecessors, (104), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:41,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 108 transitions. [2021-05-06 06:33:41,828 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 108 transitions. Word has length 101 [2021-05-06 06:33:41,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:41,828 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 108 transitions. [2021-05-06 06:33:41,828 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 28 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:41,828 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 108 transitions. [2021-05-06 06:33:41,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-06 06:33:41,828 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:41,829 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 25, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:42,045 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:42,045 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:42,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:42,046 INFO L82 PathProgramCache]: Analyzing trace with hash -482509320, now seen corresponding path program 15 times [2021-05-06 06:33:42,046 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:42,046 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972055954] [2021-05-06 06:33:42,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:42,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:42,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:42,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:42,505 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 436 proven. 950 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 06:33:42,505 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:42,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972055954] [2021-05-06 06:33:42,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1972055954] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:42,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [789463847] [2021-05-06 06:33:42,505 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:42,654 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-05-06 06:33:42,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:33:42,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-06 06:33:42,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:42,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:43,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:43,553 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 493 proven. 57 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2021-05-06 06:33:43,553 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [789463847] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:43,553 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:43,553 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 12] total 39 [2021-05-06 06:33:43,553 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851100517] [2021-05-06 06:33:43,553 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 06:33:43,553 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:43,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 06:33:43,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 06:33:43,554 INFO L87 Difference]: Start difference. First operand 106 states and 108 transitions. Second operand has 39 states, 39 states have (on average 2.8974358974358974) internal successors, (113), 38 states have internal predecessors, (113), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:47,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:47,361 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2021-05-06 06:33:47,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 06:33:47,361 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.8974358974358974) internal successors, (113), 38 states have internal predecessors, (113), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2021-05-06 06:33:47,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:47,362 INFO L225 Difference]: With dead ends: 117 [2021-05-06 06:33:47,362 INFO L226 Difference]: Without dead ends: 117 [2021-05-06 06:33:47,363 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 92 SyntacticMatches, 6 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 702 ImplicationChecksByTransitivity, 3273.6ms TimeCoverageRelationStatistics Valid=511, Invalid=5189, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 06:33:47,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-06 06:33:47,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2021-05-06 06:33:47,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0272727272727273) internal successors, (113), 110 states have internal predecessors, (113), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:47,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2021-05-06 06:33:47,365 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 104 [2021-05-06 06:33:47,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:47,365 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2021-05-06 06:33:47,365 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 2.8974358974358974) internal successors, (113), 38 states have internal predecessors, (113), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:47,365 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2021-05-06 06:33:47,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-06 06:33:47,365 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:47,366 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 27, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:47,569 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:47,569 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:47,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:47,569 INFO L82 PathProgramCache]: Analyzing trace with hash 1631393989, now seen corresponding path program 16 times [2021-05-06 06:33:47,569 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:47,570 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1384960361] [2021-05-06 06:33:47,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:47,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:48,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:48,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:48,049 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 553 proven. 1107 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-06 06:33:48,049 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:48,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1384960361] [2021-05-06 06:33:48,050 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1384960361] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:48,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1480632747] [2021-05-06 06:33:48,050 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:48,115 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:33:48,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:33:48,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-06 06:33:48,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:33:48,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:33:48,282 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 553 proven. 1107 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-06 06:33:48,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1480632747] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:48,283 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:33:48,283 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-06 06:33:48,283 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137798400] [2021-05-06 06:33:48,283 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 06:33:48,283 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:33:48,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 06:33:48,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-06 06:33:48,284 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:50,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:33:50,001 INFO L93 Difference]: Finished difference Result 119 states and 121 transitions. [2021-05-06 06:33:50,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 06:33:50,001 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2021-05-06 06:33:50,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:33:50,002 INFO L225 Difference]: With dead ends: 119 [2021-05-06 06:33:50,002 INFO L226 Difference]: Without dead ends: 119 [2021-05-06 06:33:50,003 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 1233.0ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 06:33:50,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-06 06:33:50,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2021-05-06 06:33:50,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0265486725663717) internal successors, (116), 113 states have internal predecessors, (116), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:50,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 120 transitions. [2021-05-06 06:33:50,004 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 120 transitions. Word has length 113 [2021-05-06 06:33:50,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:33:50,005 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 120 transitions. [2021-05-06 06:33:50,005 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:33:50,005 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 120 transitions. [2021-05-06 06:33:50,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-05-06 06:33:50,005 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:33:50,005 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 28, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:33:50,221 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:33:50,221 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:33:50,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:33:50,222 INFO L82 PathProgramCache]: Analyzing trace with hash 1404091255, now seen corresponding path program 17 times [2021-05-06 06:33:50,222 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:33:50,222 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2110109013] [2021-05-06 06:33:50,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:33:50,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:50,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:33:50,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:33:50,702 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 573 proven. 1190 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-06 06:33:50,702 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:33:50,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2110109013] [2021-05-06 06:33:50,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2110109013] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:33:50,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [84806154] [2021-05-06 06:33:50,702 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:34:27,463 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 36 check-sat command(s) [2021-05-06 06:34:27,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:34:27,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-06 06:34:27,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:34:27,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:34:27,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:34:28,011 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 573 proven. 1190 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-06 06:34:28,011 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [84806154] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:34:28,011 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:34:28,011 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-06 06:34:28,012 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131212100] [2021-05-06 06:34:28,012 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 06:34:28,012 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:34:28,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 06:34:28,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 06:34:28,013 INFO L87 Difference]: Start difference. First operand 118 states and 120 transitions. Second operand has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:34:29,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:34:29,810 INFO L93 Difference]: Finished difference Result 122 states and 124 transitions. [2021-05-06 06:34:29,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 06:34:29,812 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 116 [2021-05-06 06:34:29,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:34:29,813 INFO L225 Difference]: With dead ends: 122 [2021-05-06 06:34:29,813 INFO L226 Difference]: Without dead ends: 122 [2021-05-06 06:34:29,813 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 92 SyntacticMatches, 27 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 461 ImplicationChecksByTransitivity, 1590.9ms TimeCoverageRelationStatistics Valid=237, Invalid=3545, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 06:34:29,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-06 06:34:29,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2021-05-06 06:34:29,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:34:29,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2021-05-06 06:34:29,815 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 116 [2021-05-06 06:34:29,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:34:29,815 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2021-05-06 06:34:29,815 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:34:29,815 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2021-05-06 06:34:29,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-06 06:34:29,816 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:34:29,816 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 29, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:34:30,022 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-06 06:34:30,023 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:34:30,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:34:30,023 INFO L82 PathProgramCache]: Analyzing trace with hash -1303198843, now seen corresponding path program 18 times [2021-05-06 06:34:30,023 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:34:30,023 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [544093009] [2021-05-06 06:34:30,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:34:30,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:34:30,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:34:30,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:34:30,546 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 593 proven. 1276 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-06 06:34:30,546 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:34:30,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [544093009] [2021-05-06 06:34:30,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [544093009] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:34:30,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069931161] [2021-05-06 06:34:30,546 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:34:31,855 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-06 06:34:31,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:34:31,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-06 06:34:31,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:34:33,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:34:34,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:34:34,338 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 857 proven. 624 refuted. 0 times theorem prover too weak. 445 trivial. 0 not checked. [2021-05-06 06:34:34,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1069931161] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:34:34,338 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:34:34,339 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 64 [2021-05-06 06:34:34,339 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940124608] [2021-05-06 06:34:34,339 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-06 06:34:34,339 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:34:34,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-06 06:34:34,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=414, Invalid=3618, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 06:34:34,340 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 64 states, 64 states have (on average 2.484375) internal successors, (159), 63 states have internal predecessors, (159), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:34:38,371 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 45 [2021-05-06 06:34:39,023 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 45 [2021-05-06 06:34:39,705 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 45 [2021-05-06 06:34:40,461 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 45 [2021-05-06 06:34:43,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:34:43,067 INFO L93 Difference]: Finished difference Result 162 states and 174 transitions. [2021-05-06 06:34:43,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-06 06:34:43,067 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.484375) internal successors, (159), 63 states have internal predecessors, (159), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 119 [2021-05-06 06:34:43,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:34:43,068 INFO L225 Difference]: With dead ends: 162 [2021-05-06 06:34:43,068 INFO L226 Difference]: Without dead ends: 162 [2021-05-06 06:34:43,070 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 89 SyntacticMatches, 3 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2676 ImplicationChecksByTransitivity, 9767.3ms TimeCoverageRelationStatistics Valid=2533, Invalid=13217, Unknown=0, NotChecked=0, Total=15750 [2021-05-06 06:34:43,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-05-06 06:34:43,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 130. [2021-05-06 06:34:43,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 125 states have (on average 1.024) internal successors, (128), 125 states have internal predecessors, (128), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:34:43,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 132 transitions. [2021-05-06 06:34:43,072 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 132 transitions. Word has length 119 [2021-05-06 06:34:43,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:34:43,072 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 132 transitions. [2021-05-06 06:34:43,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 2.484375) internal successors, (159), 63 states have internal predecessors, (159), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:34:43,073 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 132 transitions. [2021-05-06 06:34:43,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-06 06:34:43,073 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:34:43,073 INFO L523 BasicCegarLoop]: trace histogram [39, 39, 31, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:34:43,280 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-06 06:34:43,281 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:34:43,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:34:43,281 INFO L82 PathProgramCache]: Analyzing trace with hash 1577549464, now seen corresponding path program 19 times [2021-05-06 06:34:43,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:34:43,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [90677722] [2021-05-06 06:34:43,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:34:43,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:34:43,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:34:43,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:34:43,903 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 728 proven. 1457 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-06 06:34:43,903 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:34:43,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [90677722] [2021-05-06 06:34:43,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [90677722] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:34:43,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [919899552] [2021-05-06 06:34:43,903 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:34:43,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:34:43,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-06 06:34:43,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:34:44,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:34:44,165 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 728 proven. 1457 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-06 06:34:44,165 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [919899552] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:34:44,165 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:34:44,165 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-06 06:34:44,172 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263030767] [2021-05-06 06:34:44,172 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 06:34:44,172 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:34:44,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 06:34:44,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 06:34:44,173 INFO L87 Difference]: Start difference. First operand 130 states and 132 transitions. Second operand has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:34:46,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:34:46,333 INFO L93 Difference]: Finished difference Result 134 states and 136 transitions. [2021-05-06 06:34:46,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 06:34:46,334 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 128 [2021-05-06 06:34:46,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:34:46,334 INFO L225 Difference]: With dead ends: 134 [2021-05-06 06:34:46,334 INFO L226 Difference]: Without dead ends: 134 [2021-05-06 06:34:46,335 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 130 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 1525.1ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 06:34:46,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-06 06:34:46,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2021-05-06 06:34:46,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:34:46,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-05-06 06:34:46,337 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 128 [2021-05-06 06:34:46,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:34:46,337 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-05-06 06:34:46,337 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:34:46,337 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-05-06 06:34:46,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-06 06:34:46,337 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:34:46,337 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 32, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:34:46,554 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:34:46,554 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:34:46,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:34:46,555 INFO L82 PathProgramCache]: Analyzing trace with hash -49815130, now seen corresponding path program 20 times [2021-05-06 06:34:46,555 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:34:46,555 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1536946570] [2021-05-06 06:34:46,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:34:46,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:34:47,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:34:47,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:34:47,182 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 751 proven. 1552 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-06 06:34:47,182 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:34:47,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1536946570] [2021-05-06 06:34:47,182 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1536946570] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:34:47,183 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1302681748] [2021-05-06 06:34:47,183 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:34:47,246 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:34:47,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:34:47,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-06 06:34:47,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:34:47,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:34:47,448 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 751 proven. 1552 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-06 06:34:47,448 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1302681748] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:34:47,449 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:34:47,449 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-06 06:34:47,449 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508681952] [2021-05-06 06:34:47,449 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 06:34:47,449 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:34:47,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 06:34:47,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 06:34:47,450 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:34:49,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:34:49,711 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2021-05-06 06:34:49,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 06:34:49,711 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-06 06:34:49,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:34:49,712 INFO L225 Difference]: With dead ends: 137 [2021-05-06 06:34:49,712 INFO L226 Difference]: Without dead ends: 137 [2021-05-06 06:34:49,712 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1617.9ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 06:34:49,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-06 06:34:49,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2021-05-06 06:34:49,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.0229007633587786) internal successors, (134), 131 states have internal predecessors, (134), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:34:49,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2021-05-06 06:34:49,714 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 131 [2021-05-06 06:34:49,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:34:49,714 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2021-05-06 06:34:49,714 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:34:49,714 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2021-05-06 06:34:49,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-05-06 06:34:49,715 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:34:49,715 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 33, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:34:49,924 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-06 06:34:49,925 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:34:49,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:34:49,925 INFO L82 PathProgramCache]: Analyzing trace with hash 722402264, now seen corresponding path program 21 times [2021-05-06 06:34:49,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:34:49,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1361593887] [2021-05-06 06:34:49,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:34:49,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:34:50,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:34:50,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:34:50,586 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 774 proven. 1650 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-06 06:34:50,586 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:34:50,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1361593887] [2021-05-06 06:34:50,586 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1361593887] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:34:50,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1324382196] [2021-05-06 06:34:50,586 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:34:50,934 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-06 06:34:50,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:34:50,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-06 06:34:50,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:34:52,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:34:52,783 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 780 proven. 416 refuted. 0 times theorem prover too weak. 1305 trivial. 0 not checked. [2021-05-06 06:34:52,784 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1324382196] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:34:52,784 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:34:52,784 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 17] total 52 [2021-05-06 06:34:52,784 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902942280] [2021-05-06 06:34:52,784 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 06:34:52,784 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:34:52,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 06:34:52,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=2492, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 06:34:52,785 INFO L87 Difference]: Start difference. First operand 136 states and 138 transitions. Second operand has 52 states, 52 states have (on average 2.9038461538461537) internal successors, (151), 51 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:34:58,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:34:58,312 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2021-05-06 06:34:58,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-06 06:34:58,312 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.9038461538461537) internal successors, (151), 51 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 134 [2021-05-06 06:34:58,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:34:58,313 INFO L225 Difference]: With dead ends: 147 [2021-05-06 06:34:58,313 INFO L226 Difference]: Without dead ends: 147 [2021-05-06 06:34:58,313 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 111 SyntacticMatches, 12 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1414 ImplicationChecksByTransitivity, 5243.7ms TimeCoverageRelationStatistics Valid=680, Invalid=9022, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 06:34:58,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-05-06 06:34:58,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 145. [2021-05-06 06:34:58,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 140 states have internal predecessors, (143), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:34:58,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 147 transitions. [2021-05-06 06:34:58,315 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 147 transitions. Word has length 134 [2021-05-06 06:34:58,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:34:58,316 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 147 transitions. [2021-05-06 06:34:58,316 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 2.9038461538461537) internal successors, (151), 51 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:34:58,316 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 147 transitions. [2021-05-06 06:34:58,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-06 06:34:58,316 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:34:58,316 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 35, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:34:58,520 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:34:58,520 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:34:58,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:34:58,520 INFO L82 PathProgramCache]: Analyzing trace with hash 1008271077, now seen corresponding path program 22 times [2021-05-06 06:34:58,521 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:34:58,521 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601991215] [2021-05-06 06:34:58,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:34:58,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:34:59,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:34:59,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:34:59,218 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 927 proven. 1855 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-06 06:34:59,218 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:34:59,218 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601991215] [2021-05-06 06:34:59,218 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [601991215] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:34:59,218 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [292462043] [2021-05-06 06:34:59,218 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:34:59,276 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:34:59,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:34:59,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 85 conjunts are in the unsatisfiable core [2021-05-06 06:34:59,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:34:59,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:34:59,685 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 333 proven. 2542 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-06 06:34:59,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [292462043] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:34:59,685 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:34:59,685 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 44] total 46 [2021-05-06 06:34:59,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073943425] [2021-05-06 06:34:59,686 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 06:34:59,686 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:34:59,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 06:34:59,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1945, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 06:34:59,686 INFO L87 Difference]: Start difference. First operand 145 states and 147 transitions. Second operand has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:35:03,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:35:03,042 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2021-05-06 06:35:03,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 06:35:03,042 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 143 [2021-05-06 06:35:03,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:35:03,043 INFO L225 Difference]: With dead ends: 167 [2021-05-06 06:35:03,043 INFO L226 Difference]: Without dead ends: 167 [2021-05-06 06:35:03,044 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 139 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 883 ImplicationChecksByTransitivity, 2289.5ms TimeCoverageRelationStatistics Valid=329, Invalid=7327, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 06:35:03,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-06 06:35:03,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2021-05-06 06:35:03,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 161 states have (on average 1.0186335403726707) internal successors, (164), 161 states have internal predecessors, (164), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:35:03,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 168 transitions. [2021-05-06 06:35:03,046 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 168 transitions. Word has length 143 [2021-05-06 06:35:03,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:35:03,046 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 168 transitions. [2021-05-06 06:35:03,046 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:35:03,046 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 168 transitions. [2021-05-06 06:35:03,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-05-06 06:35:03,046 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:35:03,047 INFO L523 BasicCegarLoop]: trace histogram [51, 51, 42, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:35:03,256 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-06 06:35:03,257 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:35:03,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:35:03,263 INFO L82 PathProgramCache]: Analyzing trace with hash 1173329367, now seen corresponding path program 23 times [2021-05-06 06:35:03,263 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:35:03,263 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495880387] [2021-05-06 06:35:03,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:35:03,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:35:04,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:35:04,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:35:04,242 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1109 proven. 2667 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-06 06:35:04,242 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:35:04,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495880387] [2021-05-06 06:35:04,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1495880387] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:35:04,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019068348] [2021-05-06 06:35:04,242 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:42:42,977 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 52 check-sat command(s) [2021-05-06 06:42:42,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:42:43,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 138 conjunts are in the unsatisfiable core [2021-05-06 06:42:43,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:42:44,132 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1109 proven. 2667 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-06 06:42:44,133 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1019068348] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:42:44,133 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:42:44,133 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-06 06:42:44,133 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115204041] [2021-05-06 06:42:44,133 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 06:42:44,133 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:42:44,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 06:42:44,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 06:42:44,134 INFO L87 Difference]: Start difference. First operand 166 states and 168 transitions. Second operand has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:42:47,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:42:47,858 INFO L93 Difference]: Finished difference Result 170 states and 172 transitions. [2021-05-06 06:42:47,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 06:42:47,858 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 164 [2021-05-06 06:42:47,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:42:47,859 INFO L225 Difference]: With dead ends: 170 [2021-05-06 06:42:47,859 INFO L226 Difference]: Without dead ends: 170 [2021-05-06 06:42:47,859 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 125 SyntacticMatches, 42 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 987 ImplicationChecksByTransitivity, 3321.8ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-06 06:42:47,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-06 06:42:47,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2021-05-06 06:42:47,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 164 states have internal predecessors, (167), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:42:47,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 171 transitions. [2021-05-06 06:42:47,861 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 171 transitions. Word has length 164 [2021-05-06 06:42:47,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:42:47,862 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 171 transitions. [2021-05-06 06:42:47,862 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:42:47,862 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 171 transitions. [2021-05-06 06:42:47,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-06 06:42:47,862 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:42:47,862 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 43, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:42:48,075 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-06 06:42:48,076 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:42:48,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:42:48,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1592265189, now seen corresponding path program 24 times [2021-05-06 06:42:48,076 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:42:48,076 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [920490245] [2021-05-06 06:42:48,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:42:48,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:42:49,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:42:49,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:42:49,008 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1135 proven. 2795 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-06 06:42:49,008 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:42:49,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [920490245] [2021-05-06 06:42:49,008 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [920490245] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:42:49,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1281802528] [2021-05-06 06:42:49,008 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:42:59,649 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-06 06:42:59,649 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:42:59,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-06 06:42:59,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:43:01,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:43:01,228 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1237 proven. 126 refuted. 0 times theorem prover too weak. 2667 trivial. 0 not checked. [2021-05-06 06:43:01,228 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1281802528] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:43:01,228 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:43:01,228 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 15] total 60 [2021-05-06 06:43:01,228 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250184166] [2021-05-06 06:43:01,228 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-06 06:43:01,228 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:43:01,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-06 06:43:01,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=3367, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 06:43:01,229 INFO L87 Difference]: Start difference. First operand 169 states and 171 transitions. Second operand has 60 states, 60 states have (on average 2.933333333333333) internal successors, (176), 59 states have internal predecessors, (176), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:43:10,457 WARN L205 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 45 [2021-05-06 06:43:11,584 WARN L205 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 45 [2021-05-06 06:43:13,175 WARN L205 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 45 [2021-05-06 06:43:14,969 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 45 [2021-05-06 06:43:15,837 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2021-05-06 06:43:18,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:43:18,071 INFO L93 Difference]: Finished difference Result 192 states and 198 transitions. [2021-05-06 06:43:18,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-06 06:43:18,071 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.933333333333333) internal successors, (176), 59 states have internal predecessors, (176), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 167 [2021-05-06 06:43:18,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:43:18,072 INFO L225 Difference]: With dead ends: 192 [2021-05-06 06:43:18,072 INFO L226 Difference]: Without dead ends: 192 [2021-05-06 06:43:18,073 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 152 SyntacticMatches, 6 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2164 ImplicationChecksByTransitivity, 16058.0ms TimeCoverageRelationStatistics Valid=1466, Invalid=14284, Unknown=0, NotChecked=0, Total=15750 [2021-05-06 06:43:18,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-05-06 06:43:18,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 178. [2021-05-06 06:43:18,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 173 states have (on average 1.0173410404624277) internal successors, (176), 173 states have internal predecessors, (176), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:43:18,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 180 transitions. [2021-05-06 06:43:18,076 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 180 transitions. Word has length 167 [2021-05-06 06:43:18,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:43:18,076 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 180 transitions. [2021-05-06 06:43:18,076 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 2.933333333333333) internal successors, (176), 59 states have internal predecessors, (176), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:43:18,076 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 180 transitions. [2021-05-06 06:43:18,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-05-06 06:43:18,076 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:43:18,077 INFO L523 BasicCegarLoop]: trace histogram [55, 55, 45, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:43:18,284 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-06 06:43:18,285 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:43:18,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:43:18,285 INFO L82 PathProgramCache]: Analyzing trace with hash -766993352, now seen corresponding path program 25 times [2021-05-06 06:43:18,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:43:18,285 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520069837] [2021-05-06 06:43:18,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:43:18,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:43:19,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:43:19,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:43:19,349 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1324 proven. 3060 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-06 06:43:19,349 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:43:19,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520069837] [2021-05-06 06:43:19,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [520069837] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:43:19,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [250711326] [2021-05-06 06:43:19,349 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:43:19,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:43:19,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 93 conjunts are in the unsatisfiable core [2021-05-06 06:43:19,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:43:19,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:43:19,667 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1324 proven. 3060 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-06 06:43:19,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [250711326] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:43:19,667 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:43:19,667 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-06 06:43:19,667 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689893416] [2021-05-06 06:43:19,668 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 06:43:19,668 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:43:19,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 06:43:19,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 06:43:19,668 INFO L87 Difference]: Start difference. First operand 178 states and 180 transitions. Second operand has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:43:23,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:43:23,599 INFO L93 Difference]: Finished difference Result 182 states and 184 transitions. [2021-05-06 06:43:23,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 06:43:23,599 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 176 [2021-05-06 06:43:23,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:43:23,600 INFO L225 Difference]: With dead ends: 182 [2021-05-06 06:43:23,600 INFO L226 Difference]: Without dead ends: 182 [2021-05-06 06:43:23,600 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 178 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1039 ImplicationChecksByTransitivity, 2628.7ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-06 06:43:23,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-05-06 06:43:23,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2021-05-06 06:43:23,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 176 states have (on average 1.0170454545454546) internal successors, (179), 176 states have internal predecessors, (179), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:43:23,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 183 transitions. [2021-05-06 06:43:23,603 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 183 transitions. Word has length 176 [2021-05-06 06:43:23,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:43:23,603 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 183 transitions. [2021-05-06 06:43:23,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:43:23,603 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 183 transitions. [2021-05-06 06:43:23,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-06 06:43:23,603 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:43:23,604 INFO L523 BasicCegarLoop]: trace histogram [56, 56, 46, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:43:23,816 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:43:23,817 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:43:23,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:43:23,817 INFO L82 PathProgramCache]: Analyzing trace with hash -1587713210, now seen corresponding path program 26 times [2021-05-06 06:43:23,817 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:43:23,817 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706583653] [2021-05-06 06:43:23,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:43:23,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:43:24,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:43:24,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:43:24,877 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1353 proven. 3197 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-06 06:43:24,878 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:43:24,878 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706583653] [2021-05-06 06:43:24,878 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [706583653] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:43:24,878 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2077806302] [2021-05-06 06:43:24,878 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:43:24,945 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:43:24,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:43:24,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 95 conjunts are in the unsatisfiable core [2021-05-06 06:43:24,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:43:25,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:43:25,205 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1353 proven. 3197 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-06 06:43:25,205 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2077806302] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:43:25,205 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:43:25,205 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49] total 51 [2021-05-06 06:43:25,205 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695139966] [2021-05-06 06:43:25,206 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 06:43:25,206 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:43:25,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 06:43:25,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2404, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 06:43:25,206 INFO L87 Difference]: Start difference. First operand 181 states and 183 transitions. Second operand has 51 states, 51 states have (on average 3.019607843137255) internal successors, (154), 50 states have internal predecessors, (154), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:43:29,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:43:29,750 INFO L93 Difference]: Finished difference Result 185 states and 187 transitions. [2021-05-06 06:43:29,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-06 06:43:29,750 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 3.019607843137255) internal successors, (154), 50 states have internal predecessors, (154), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 179 [2021-05-06 06:43:29,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:43:29,751 INFO L225 Difference]: With dead ends: 185 [2021-05-06 06:43:29,751 INFO L226 Difference]: Without dead ends: 185 [2021-05-06 06:43:29,752 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 181 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1085 ImplicationChecksByTransitivity, 2842.9ms TimeCoverageRelationStatistics Valid=381, Invalid=9125, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 06:43:29,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-06 06:43:29,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2021-05-06 06:43:29,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 179 states have (on average 1.0167597765363128) internal successors, (182), 179 states have internal predecessors, (182), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:43:29,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 186 transitions. [2021-05-06 06:43:29,756 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 186 transitions. Word has length 179 [2021-05-06 06:43:29,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:43:29,756 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 186 transitions. [2021-05-06 06:43:29,757 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 3.019607843137255) internal successors, (154), 50 states have internal predecessors, (154), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:43:29,757 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 186 transitions. [2021-05-06 06:43:29,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-05-06 06:43:29,757 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:43:29,757 INFO L523 BasicCegarLoop]: trace histogram [57, 57, 47, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:43:29,974 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-06 06:43:29,974 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:43:29,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:43:29,974 INFO L82 PathProgramCache]: Analyzing trace with hash -404186760, now seen corresponding path program 27 times [2021-05-06 06:43:29,975 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:43:29,975 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1739343277] [2021-05-06 06:43:29,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:43:29,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:43:31,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:43:31,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:43:31,188 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1382 proven. 3337 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-06 06:43:31,188 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:43:31,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1739343277] [2021-05-06 06:43:31,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1739343277] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:43:31,189 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866348380] [2021-05-06 06:43:31,189 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:43:31,605 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-06 06:43:31,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:43:31,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-06 06:43:31,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:43:31,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:43:32,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:43:32,638 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1493 proven. 155 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2021-05-06 06:43:32,638 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1866348380] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:43:32,638 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:43:32,638 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 15] total 64 [2021-05-06 06:43:32,638 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254811957] [2021-05-06 06:43:32,638 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-06 06:43:32,638 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:43:32,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-06 06:43:32,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=3848, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 06:43:32,639 INFO L87 Difference]: Start difference. First operand 184 states and 186 transitions. Second operand has 64 states, 64 states have (on average 2.984375) internal successors, (191), 63 states have internal predecessors, (191), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:43:45,945 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 48 [2021-05-06 06:43:46,848 WARN L205 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 43 [2021-05-06 06:43:47,865 WARN L205 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 45 [2021-05-06 06:43:48,601 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 45 [2021-05-06 06:43:49,318 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 45 [2021-05-06 06:43:55,932 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 43 [2021-05-06 06:43:56,652 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2021-05-06 06:43:57,354 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 43 [2021-05-06 06:43:58,225 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 45 [2021-05-06 06:43:59,057 WARN L205 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 43 [2021-05-06 06:44:00,050 WARN L205 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 45 [2021-05-06 06:44:01,096 WARN L205 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 43 [2021-05-06 06:44:01,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:44:01,097 INFO L93 Difference]: Finished difference Result 225 states and 238 transitions. [2021-05-06 06:44:01,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-05-06 06:44:01,097 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.984375) internal successors, (191), 63 states have internal predecessors, (191), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 182 [2021-05-06 06:44:01,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:44:01,098 INFO L225 Difference]: With dead ends: 225 [2021-05-06 06:44:01,098 INFO L226 Difference]: Without dead ends: 225 [2021-05-06 06:44:01,098 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 172 SyntacticMatches, 1 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3160 ImplicationChecksByTransitivity, 27570.8ms TimeCoverageRelationStatistics Valid=3027, Invalid=18143, Unknown=0, NotChecked=0, Total=21170 [2021-05-06 06:44:01,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2021-05-06 06:44:01,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 192. [2021-05-06 06:44:01,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 187 states have (on average 1.0160427807486632) internal successors, (190), 187 states have internal predecessors, (190), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:44:01,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 194 transitions. [2021-05-06 06:44:01,101 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 194 transitions. Word has length 182 [2021-05-06 06:44:01,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:44:01,101 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 194 transitions. [2021-05-06 06:44:01,101 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 2.984375) internal successors, (191), 63 states have internal predecessors, (191), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:44:01,101 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 194 transitions. [2021-05-06 06:44:01,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-06 06:44:01,102 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:44:01,102 INFO L523 BasicCegarLoop]: trace histogram [60, 60, 49, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:44:01,307 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:44:01,307 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:44:01,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:44:01,308 INFO L82 PathProgramCache]: Analyzing trace with hash -2025947835, now seen corresponding path program 28 times [2021-05-06 06:44:01,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:44:01,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346175448] [2021-05-06 06:44:01,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:44:01,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:44:02,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:44:02,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:44:02,545 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1589 proven. 3626 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-06 06:44:02,545 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:44:02,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346175448] [2021-05-06 06:44:02,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [346175448] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:44:02,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294499462] [2021-05-06 06:44:02,545 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:44:02,635 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:44:02,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:44:02,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-06 06:44:02,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:44:02,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:44:02,897 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1589 proven. 3626 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-06 06:44:02,897 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1294499462] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:44:02,897 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:44:02,897 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52] total 54 [2021-05-06 06:44:02,897 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245157127] [2021-05-06 06:44:02,898 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 06:44:02,898 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:44:02,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 06:44:02,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2707, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 06:44:02,898 INFO L87 Difference]: Start difference. First operand 192 states and 194 transitions. Second operand has 54 states, 54 states have (on average 3.0185185185185186) internal successors, (163), 53 states have internal predecessors, (163), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:44:07,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:44:07,557 INFO L93 Difference]: Finished difference Result 196 states and 198 transitions. [2021-05-06 06:44:07,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 06:44:07,558 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.0185185185185186) internal successors, (163), 53 states have internal predecessors, (163), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 191 [2021-05-06 06:44:07,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:44:07,558 INFO L225 Difference]: With dead ends: 196 [2021-05-06 06:44:07,559 INFO L226 Difference]: Without dead ends: 196 [2021-05-06 06:44:07,559 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 193 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1229 ImplicationChecksByTransitivity, 3042.1ms TimeCoverageRelationStatistics Valid=405, Invalid=10307, Unknown=0, NotChecked=0, Total=10712 [2021-05-06 06:44:07,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-05-06 06:44:07,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2021-05-06 06:44:07,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 190 states have (on average 1.0157894736842106) internal successors, (193), 190 states have internal predecessors, (193), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:44:07,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 197 transitions. [2021-05-06 06:44:07,561 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 197 transitions. Word has length 191 [2021-05-06 06:44:07,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:44:07,562 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 197 transitions. [2021-05-06 06:44:07,562 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 3.0185185185185186) internal successors, (163), 53 states have internal predecessors, (163), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:44:07,562 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 197 transitions. [2021-05-06 06:44:07,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-05-06 06:44:07,562 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:44:07,562 INFO L523 BasicCegarLoop]: trace histogram [61, 61, 50, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:44:07,783 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-06 06:44:07,784 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:44:07,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:44:07,784 INFO L82 PathProgramCache]: Analyzing trace with hash 1980493943, now seen corresponding path program 29 times [2021-05-06 06:44:07,784 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:44:07,784 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286302810] [2021-05-06 06:44:07,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:44:07,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:44:08,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:44:08,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:44:08,980 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1621 proven. 3775 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-06 06:44:08,980 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:44:08,980 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286302810] [2021-05-06 06:44:08,980 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [286302810] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:44:08,980 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1993935612] [2021-05-06 06:44:08,980 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true