/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/Mono6_1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:33:33,624 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:33:33,627 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:33:33,672 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 18:33:33,686 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 18:33:33,687 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 18:33:33,702 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 18:33:33,704 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 18:33:33,708 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 18:33:33,712 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 18:33:33,713 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 18:33:33,715 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 18:33:33,716 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 18:33:33,719 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 18:33:33,719 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 18:33:33,722 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 18:33:33,728 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 18:33:33,735 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:33:33,735 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:33:33,736 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:33:33,745 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:33:33,763 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:33:33,763 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:33:33,766 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:33:33,766 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:33:33,766 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:33:33,766 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:33:33,767 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:33:33,767 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:33:33,767 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:33:33,767 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:33:33,768 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:33:33,768 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:33:33,768 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:33:33,768 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:33:33,769 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:33:33,769 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:33:33,769 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:33:33,769 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:33:33,769 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:33:33,769 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:33:33,769 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:33:33,770 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:33:33,771 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:33:34,130 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:33:34,158 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:33:34,161 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:33:34,162 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:33:34,163 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:33:34,164 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono6_1.c [2021-05-02 18:33:34,232 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7d61e3ff5/ed2f5c11da304d569d029b6246e0cb8f/FLAG632ace3b3 [2021-05-02 18:33:34,636 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:33:34,637 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono6_1.c [2021-05-02 18:33:34,643 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7d61e3ff5/ed2f5c11da304d569d029b6246e0cb8f/FLAG632ace3b3 [2021-05-02 18:33:34,664 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7d61e3ff5/ed2f5c11da304d569d029b6246e0cb8f [2021-05-02 18:33:34,667 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:33:34,670 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:33:34,674 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:33:34,674 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:33:34,678 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:33:34,679 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:33:34" (1/1) ... [2021-05-02 18:33:34,680 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d659c79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:33:34, skipping insertion in model container [2021-05-02 18:33:34,680 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:33:34" (1/1) ... [2021-05-02 18:33:34,687 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:33:34,698 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:33:34,851 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/Mono6_1.c[311,324] [2021-05-02 18:33:34,868 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:33:34,878 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:33:34,938 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/Mono6_1.c[311,324] [2021-05-02 18:33:34,952 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:33:34,966 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:33:34,968 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:33:34 WrapperNode [2021-05-02 18:33:34,968 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:33:34,970 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:33:34,970 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:33:34,970 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:33:34,984 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:33:34" (1/1) ... [2021-05-02 18:33:34,984 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:33:34" (1/1) ... [2021-05-02 18:33:34,991 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:33:34" (1/1) ... [2021-05-02 18:33:34,992 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:33:34" (1/1) ... [2021-05-02 18:33:35,000 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:33:34" (1/1) ... [2021-05-02 18:33:35,005 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:33:34" (1/1) ... [2021-05-02 18:33:35,009 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:33:34" (1/1) ... [2021-05-02 18:33:35,013 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:33:35,015 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:33:35,015 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:33:35,015 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:33:35,016 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:33:34" (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 [2021-05-02 18:33:35,093 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:33:35,093 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:33:35,093 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:33:35,093 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:33:35,093 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:33:35,093 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:33:35,094 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:33:35,094 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:33:35,094 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:33:35,094 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:33:35,094 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:33:35,095 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:33:35,095 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:33:35,095 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:33:35,095 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:33:35,095 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:33:35,096 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:33:35,374 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:33:35,374 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 18:33:35,375 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:33:35 BoogieIcfgContainer [2021-05-02 18:33:35,375 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:33:35,376 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:33:35,376 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:33:35,377 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:33:35,379 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:33:35" (1/1) ... [2021-05-02 18:33:35,403 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:33:35 BasicIcfg [2021-05-02 18:33:35,404 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:33:35,406 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:33:35,406 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:33:35,409 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:33:35,409 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:33:34" (1/4) ... [2021-05-02 18:33:35,410 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79780d46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:33:35, skipping insertion in model container [2021-05-02 18:33:35,410 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:33:34" (2/4) ... [2021-05-02 18:33:35,410 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79780d46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:33:35, skipping insertion in model container [2021-05-02 18:33:35,410 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:33:35" (3/4) ... [2021-05-02 18:33:35,411 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79780d46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:33:35, skipping insertion in model container [2021-05-02 18:33:35,411 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:33:35" (4/4) ... [2021-05-02 18:33:35,412 INFO L111 eAbstractionObserver]: Analyzing ICFG Mono6_1.cJordan [2021-05-02 18:33:35,420 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:33:35,424 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:33:35,439 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:33:35,456 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:33:35,456 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:33:35,456 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:33:35,456 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:33:35,456 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:33:35,457 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:33:35,457 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:33:35,457 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:33:35,469 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) [2021-05-02 18:33:35,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:33:35,475 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:35,475 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:35,476 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:35,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:35,480 INFO L82 PathProgramCache]: Analyzing trace with hash 447419557, now seen corresponding path program 1 times [2021-05-02 18:33:35,488 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:35,488 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [402768266] [2021-05-02 18:33:35,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:35,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:35,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:35,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:35,716 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:33:35,717 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:35,717 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [402768266] [2021-05-02 18:33:35,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [402768266] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:33:35,718 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:33:35,718 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 18:33:35,719 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372015902] [2021-05-02 18:33:35,722 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:33:35,723 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:35,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:33:35,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:33:35,735 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) [2021-05-02 18:33:35,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:35,779 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2021-05-02 18:33:35,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:33:35,781 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 [2021-05-02 18:33:35,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:35,787 INFO L225 Difference]: With dead ends: 21 [2021-05-02 18:33:35,788 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 18:33:35,789 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 61.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:33:35,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 18:33:35,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 18:33:35,815 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) [2021-05-02 18:33:35,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 18:33:35,816 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 18:33:35,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:35,817 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 18:33:35,817 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) [2021-05-02 18:33:35,817 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 18:33:35,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:33:35,819 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:35,819 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:35,819 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:33:35,819 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:35,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:35,822 INFO L82 PathProgramCache]: Analyzing trace with hash 448343078, now seen corresponding path program 1 times [2021-05-02 18:33:35,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:35,822 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924118559] [2021-05-02 18:33:35,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:35,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:36,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:36,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:36,103 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:33:36,104 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:36,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924118559] [2021-05-02 18:33:36,105 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924118559] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:33:36,106 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:33:36,106 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:33:36,106 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468738963] [2021-05-02 18:33:36,108 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:33:36,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:36,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:33:36,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:33:36,110 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) [2021-05-02 18:33:36,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:36,176 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-05-02 18:33:36,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:33:36,177 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 [2021-05-02 18:33:36,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:36,178 INFO L225 Difference]: With dead ends: 17 [2021-05-02 18:33:36,178 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 18:33:36,179 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 112.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 18:33:36,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 18:33:36,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-02 18:33:36,181 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) [2021-05-02 18:33:36,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-02 18:33:36,182 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-05-02 18:33:36,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:36,182 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-02 18:33:36,183 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) [2021-05-02 18:33:36,183 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-02 18:33:36,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 18:33:36,183 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:36,183 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:36,184 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:33:36,184 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:36,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:36,185 INFO L82 PathProgramCache]: Analyzing trace with hash -1516694440, now seen corresponding path program 1 times [2021-05-02 18:33:36,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:36,185 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2145403241] [2021-05-02 18:33:36,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:36,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:36,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:36,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:36,327 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:33:36,327 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:36,332 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2145403241] [2021-05-02 18:33:36,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2145403241] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:36,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271097961] [2021-05-02 18:33:36,333 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 [2021-05-02 18:33:36,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:36,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 18:33:36,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:36,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:36,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:36,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:36,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:36,600 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:33:36,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271097961] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:33:36,601 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:33:36,601 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 9 [2021-05-02 18:33:36,601 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713135866] [2021-05-02 18:33:36,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:33:36,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:36,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:33:36,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:33:36,603 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:36,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:36,661 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-05-02 18:33:36,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:33:36,662 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 2 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 14 [2021-05-02 18:33:36,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:36,664 INFO L225 Difference]: With dead ends: 22 [2021-05-02 18:33:36,665 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 18:33:36,666 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 137.3ms TimeCoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:33:36,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 18:33:36,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 18:33:36,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 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) [2021-05-02 18:33:36,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-05-02 18:33:36,673 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2021-05-02 18:33:36,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:36,674 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-05-02 18:33:36,674 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:36,674 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-05-02 18:33:36,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 18:33:36,675 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:36,675 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:36,889 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 18:33:36,889 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:36,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:36,890 INFO L82 PathProgramCache]: Analyzing trace with hash 1862314917, now seen corresponding path program 1 times [2021-05-02 18:33:36,890 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:36,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751768774] [2021-05-02 18:33:36,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:36,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:37,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:37,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:37,015 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:33:37,015 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:37,015 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751768774] [2021-05-02 18:33:37,016 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751768774] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:37,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [170979496] [2021-05-02 18:33:37,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2021-05-02 18:33:37,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:37,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:33:37,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:37,120 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:33:37,120 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [170979496] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:37,120 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:37,120 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 18:33:37,121 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443728683] [2021-05-02 18:33:37,121 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:33:37,121 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:37,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:33:37,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:33:37,122 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 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) [2021-05-02 18:33:37,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:37,228 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2021-05-02 18:33:37,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 18:33:37,229 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 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 [2021-05-02 18:33:37,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:37,230 INFO L225 Difference]: With dead ends: 23 [2021-05-02 18:33:37,230 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 18:33:37,231 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 117.0ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:33:37,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 18:33:37,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-02 18:33:37,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 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) [2021-05-02 18:33:37,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-05-02 18:33:37,237 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2021-05-02 18:33:37,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:37,238 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-05-02 18:33:37,238 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 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) [2021-05-02 18:33:37,238 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-05-02 18:33:37,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 18:33:37,240 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:37,240 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:37,453 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:33:37,453 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:37,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:37,454 INFO L82 PathProgramCache]: Analyzing trace with hash 290072151, now seen corresponding path program 2 times [2021-05-02 18:33:37,454 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:37,454 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1066624174] [2021-05-02 18:33:37,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:37,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:37,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:37,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:37,548 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:33:37,549 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:37,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1066624174] [2021-05-02 18:33:37,550 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1066624174] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:37,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [919400559] [2021-05-02 18:33:37,550 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 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 [2021-05-02 18:33:37,598 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:33:37,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:37,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 18:33:37,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:37,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:37,676 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:33:37,677 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [919400559] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:37,677 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:37,680 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 18:33:37,680 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513947651] [2021-05-02 18:33:37,681 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 18:33:37,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:37,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 18:33:37,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 18:33:37,682 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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) [2021-05-02 18:33:37,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:37,821 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-05-02 18:33:37,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:33:37,821 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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 [2021-05-02 18:33:37,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:37,824 INFO L225 Difference]: With dead ends: 26 [2021-05-02 18:33:37,825 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 18:33:37,826 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 131.6ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:33:37,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 18:33:37,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-05-02 18:33:37,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 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) [2021-05-02 18:33:37,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-02 18:33:37,832 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 20 [2021-05-02 18:33:37,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:37,833 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-02 18:33:37,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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) [2021-05-02 18:33:37,833 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-02 18:33:37,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 18:33:37,834 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:37,834 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:38,048 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:33:38,049 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:38,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:38,049 INFO L82 PathProgramCache]: Analyzing trace with hash -1775806875, now seen corresponding path program 3 times [2021-05-02 18:33:38,049 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:38,050 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913547342] [2021-05-02 18:33:38,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:38,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:38,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:38,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:38,175 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:33:38,176 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:38,176 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913547342] [2021-05-02 18:33:38,176 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [913547342] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:38,176 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1119101842] [2021-05-02 18:33:38,176 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 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 [2021-05-02 18:33:38,234 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 18:33:38,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:38,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 18:33:38,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:38,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:38,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:38,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:38,401 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:33:38,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1119101842] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:38,401 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:38,401 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-05-02 18:33:38,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508652237] [2021-05-02 18:33:38,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 18:33:38,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:38,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 18:33:38,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:33:38,403 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 12 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:38,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:38,989 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2021-05-02 18:33:38,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:33:38,990 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 18:33:38,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:38,991 INFO L225 Difference]: With dead ends: 35 [2021-05-02 18:33:38,991 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 18:33:38,991 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 539.0ms TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2021-05-02 18:33:38,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 18:33:38,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-05-02 18:33:38,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 26 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) [2021-05-02 18:33:38,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-05-02 18:33:38,995 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 23 [2021-05-02 18:33:38,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:38,995 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-05-02 18:33:38,995 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:38,995 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-05-02 18:33:38,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 18:33:38,996 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:38,996 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:39,196 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:33:39,197 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:39,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:39,197 INFO L82 PathProgramCache]: Analyzing trace with hash -460750842, now seen corresponding path program 4 times [2021-05-02 18:33:39,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:39,198 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102312485] [2021-05-02 18:33:39,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:39,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:39,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:39,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:39,315 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:33:39,316 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:39,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102312485] [2021-05-02 18:33:39,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [102312485] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:39,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [43792765] [2021-05-02 18:33:39,317 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 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 [2021-05-02 18:33:39,360 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:33:39,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:39,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 18:33:39,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:39,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:39,470 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:33:39,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [43792765] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:39,470 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:39,470 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 18:33:39,470 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833291012] [2021-05-02 18:33:39,471 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 18:33:39,471 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:39,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 18:33:39,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:33:39,472 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 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) [2021-05-02 18:33:39,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:39,698 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2021-05-02 18:33:39,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:33:39,713 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 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 [2021-05-02 18:33:39,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:39,714 INFO L225 Difference]: With dead ends: 35 [2021-05-02 18:33:39,714 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 18:33:39,714 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 231.1ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:33:39,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 18:33:39,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-05-02 18:33:39,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 29 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) [2021-05-02 18:33:39,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-02 18:33:39,718 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 29 [2021-05-02 18:33:39,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:39,718 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-02 18:33:39,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 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) [2021-05-02 18:33:39,718 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-02 18:33:39,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 18:33:39,719 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:39,719 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:39,943 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:33:39,944 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:39,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:39,944 INFO L82 PathProgramCache]: Analyzing trace with hash -1450803272, now seen corresponding path program 5 times [2021-05-02 18:33:39,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:39,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650297399] [2021-05-02 18:33:39,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:39,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:40,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:40,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:40,106 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 40 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:33:40,106 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:40,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650297399] [2021-05-02 18:33:40,107 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650297399] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:40,107 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [906437938] [2021-05-02 18:33:40,107 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 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 [2021-05-02 18:33:40,283 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 18:33:40,283 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:40,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 18:33:40,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:40,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:40,438 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:33:40,438 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [906437938] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:40,439 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:40,439 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 11 [2021-05-02 18:33:40,439 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781375505] [2021-05-02 18:33:40,439 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:33:40,439 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:40,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:33:40,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:33:40,440 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 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) [2021-05-02 18:33:40,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:40,725 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2021-05-02 18:33:40,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:33:40,726 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 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 [2021-05-02 18:33:40,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:40,726 INFO L225 Difference]: With dead ends: 41 [2021-05-02 18:33:40,726 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 18:33:40,727 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 28 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 289.4ms TimeCoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:33:40,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 18:33:40,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2021-05-02 18:33:40,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 35 states have internal predecessors, (39), 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) [2021-05-02 18:33:40,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2021-05-02 18:33:40,730 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 32 [2021-05-02 18:33:40,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:40,730 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2021-05-02 18:33:40,730 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 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) [2021-05-02 18:33:40,730 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2021-05-02 18:33:40,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 18:33:40,731 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:40,731 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:40,935 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:33:40,935 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:40,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:40,936 INFO L82 PathProgramCache]: Analyzing trace with hash -1671627528, now seen corresponding path program 6 times [2021-05-02 18:33:40,936 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:40,936 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478261777] [2021-05-02 18:33:40,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:40,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:41,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:41,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:41,109 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:33:41,109 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:41,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478261777] [2021-05-02 18:33:41,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478261777] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:41,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351891258] [2021-05-02 18:33:41,110 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 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 [2021-05-02 18:33:41,212 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 18:33:41,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:41,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 18:33:41,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:41,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:41,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:41,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:41,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:41,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:41,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:41,427 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:33:41,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [351891258] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:41,427 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:41,427 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 17 [2021-05-02 18:33:41,428 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811572456] [2021-05-02 18:33:41,428 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 18:33:41,428 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:41,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 18:33:41,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=234, Unknown=0, NotChecked=0, Total=272 [2021-05-02 18:33:41,429 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 17 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:42,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:42,233 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2021-05-02 18:33:42,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 18:33:42,235 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 18:33:42,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:42,236 INFO L225 Difference]: With dead ends: 50 [2021-05-02 18:33:42,236 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 18:33:42,237 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 685.0ms TimeCoverageRelationStatistics Valid=128, Invalid=802, Unknown=0, NotChecked=0, Total=930 [2021-05-02 18:33:42,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 18:33:42,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-05-02 18:33:42,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 41 states have internal predecessors, (46), 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) [2021-05-02 18:33:42,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-05-02 18:33:42,255 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2021-05-02 18:33:42,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:42,255 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-05-02 18:33:42,255 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:42,256 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-05-02 18:33:42,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 18:33:42,256 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:42,256 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:42,485 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:33:42,485 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:42,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:42,486 INFO L82 PathProgramCache]: Analyzing trace with hash 1286439863, now seen corresponding path program 7 times [2021-05-02 18:33:42,486 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:42,486 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2013214030] [2021-05-02 18:33:42,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:42,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:42,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:42,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:42,652 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 69 proven. 100 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:33:42,652 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:42,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2013214030] [2021-05-02 18:33:42,653 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2013214030] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:42,653 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1245807410] [2021-05-02 18:33:42,653 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 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 [2021-05-02 18:33:42,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:42,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 18:33:42,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:42,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:42,810 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 69 proven. 100 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:33:42,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1245807410] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:42,810 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:42,810 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 18:33:42,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339628309] [2021-05-02 18:33:42,811 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 18:33:42,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:42,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 18:33:42,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 18:33:42,812 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 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) [2021-05-02 18:33:43,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:43,278 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2021-05-02 18:33:43,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:33:43,278 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 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 [2021-05-02 18:33:43,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:43,279 INFO L225 Difference]: With dead ends: 50 [2021-05-02 18:33:43,279 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 18:33:43,279 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 384.7ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:33:43,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 18:33:43,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-05-02 18:33:43,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 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) [2021-05-02 18:33:43,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2021-05-02 18:33:43,282 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 44 [2021-05-02 18:33:43,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:43,283 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2021-05-02 18:33:43,283 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 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) [2021-05-02 18:33:43,283 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2021-05-02 18:33:43,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 18:33:43,284 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:43,284 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:43,492 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 18:33:43,493 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:43,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:43,493 INFO L82 PathProgramCache]: Analyzing trace with hash -1818302011, now seen corresponding path program 8 times [2021-05-02 18:33:43,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:43,493 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [840675092] [2021-05-02 18:33:43,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:43,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:43,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:43,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:43,661 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 77 proven. 126 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:33:43,661 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:43,661 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [840675092] [2021-05-02 18:33:43,661 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [840675092] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:43,661 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [551615241] [2021-05-02 18:33:43,661 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 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 [2021-05-02 18:33:43,721 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:33:43,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:43,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 18:33:43,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:43,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:43,831 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 77 proven. 126 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:33:43,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [551615241] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:43,832 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:43,832 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 18:33:43,833 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337876294] [2021-05-02 18:33:43,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:33:43,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:43,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:33:43,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:33:43,834 INFO L87 Difference]: Start difference. First operand 49 states and 53 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) [2021-05-02 18:33:44,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:44,307 INFO L93 Difference]: Finished difference Result 53 states and 57 transitions. [2021-05-02 18:33:44,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:33:44,307 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 47 [2021-05-02 18:33:44,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:44,308 INFO L225 Difference]: With dead ends: 53 [2021-05-02 18:33:44,308 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 18:33:44,308 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 382.2ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:33:44,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 18:33:44,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-05-02 18:33:44,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 47 states have internal predecessors, (52), 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) [2021-05-02 18:33:44,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-05-02 18:33:44,311 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 47 [2021-05-02 18:33:44,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:44,312 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-05-02 18:33:44,312 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) [2021-05-02 18:33:44,312 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-05-02 18:33:44,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 18:33:44,313 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:44,313 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:44,521 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:33:44,521 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:44,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:44,522 INFO L82 PathProgramCache]: Analyzing trace with hash 1232216311, now seen corresponding path program 9 times [2021-05-02 18:33:44,522 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:44,522 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290591494] [2021-05-02 18:33:44,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:44,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:44,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:44,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:44,717 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 85 proven. 155 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:33:44,717 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:44,717 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290591494] [2021-05-02 18:33:44,717 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [290591494] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:44,717 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932854251] [2021-05-02 18:33:44,717 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 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 [2021-05-02 18:33:44,778 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 18:33:44,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:44,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 18:33:44,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:44,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:45,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:45,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:45,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:45,089 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:33:45,089 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1932854251] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:45,089 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:45,089 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10] total 22 [2021-05-02 18:33:45,089 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014085773] [2021-05-02 18:33:45,090 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 18:33:45,091 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:45,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 18:33:45,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=410, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:33:45,092 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 22 states, 21 states have (on average 2.761904761904762) internal successors, (58), 20 states have internal predecessors, (58), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:46,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:46,175 INFO L93 Difference]: Finished difference Result 63 states and 68 transitions. [2021-05-02 18:33:46,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 18:33:46,175 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.761904761904762) internal successors, (58), 20 states have internal predecessors, (58), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 18:33:46,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:46,176 INFO L225 Difference]: With dead ends: 63 [2021-05-02 18:33:46,176 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 18:33:46,177 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 907.0ms TimeCoverageRelationStatistics Valid=176, Invalid=1464, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 18:33:46,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 18:33:46,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2021-05-02 18:33:46,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 53 states have internal predecessors, (59), 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) [2021-05-02 18:33:46,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2021-05-02 18:33:46,180 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 50 [2021-05-02 18:33:46,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:46,181 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2021-05-02 18:33:46,181 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 2.761904761904762) internal successors, (58), 20 states have internal predecessors, (58), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:46,181 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2021-05-02 18:33:46,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 18:33:46,182 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:46,182 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:46,382 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 18:33:46,383 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:46,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:46,383 INFO L82 PathProgramCache]: Analyzing trace with hash 764014680, now seen corresponding path program 10 times [2021-05-02 18:33:46,384 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:46,384 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120459785] [2021-05-02 18:33:46,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:46,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:46,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:46,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:46,639 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 128 proven. 187 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:33:46,639 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:46,639 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120459785] [2021-05-02 18:33:46,639 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1120459785] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:46,639 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [514241179] [2021-05-02 18:33:46,639 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 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 [2021-05-02 18:33:46,696 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:33:46,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:46,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 18:33:46,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:46,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:46,830 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 128 proven. 187 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:33:46,830 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [514241179] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:46,831 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:46,831 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 18:33:46,831 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042623340] [2021-05-02 18:33:46,832 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 18:33:46,832 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:46,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 18:33:46,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:33:46,833 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 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) [2021-05-02 18:33:47,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:47,427 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2021-05-02 18:33:47,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 18:33:47,428 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 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 56 [2021-05-02 18:33:47,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:47,429 INFO L225 Difference]: With dead ends: 62 [2021-05-02 18:33:47,429 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 18:33:47,429 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 488.6ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:33:47,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 18:33:47,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-02 18:33:47,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.1071428571428572) internal successors, (62), 56 states have internal predecessors, (62), 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) [2021-05-02 18:33:47,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 66 transitions. [2021-05-02 18:33:47,433 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 66 transitions. Word has length 56 [2021-05-02 18:33:47,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:47,433 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 66 transitions. [2021-05-02 18:33:47,433 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 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) [2021-05-02 18:33:47,433 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 66 transitions. [2021-05-02 18:33:47,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 18:33:47,434 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:47,434 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:47,648 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 18:33:47,648 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:47,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:47,649 INFO L82 PathProgramCache]: Analyzing trace with hash -759385754, now seen corresponding path program 11 times [2021-05-02 18:33:47,649 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:47,649 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980753213] [2021-05-02 18:33:47,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:47,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:47,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:47,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:47,898 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 139 proven. 222 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:33:47,898 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:47,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980753213] [2021-05-02 18:33:47,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [980753213] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:47,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995344040] [2021-05-02 18:33:47,898 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 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 [2021-05-02 18:33:48,777 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-02 18:33:48,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:48,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 18:33:48,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:49,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:49,036 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 139 proven. 222 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:33:49,037 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995344040] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:49,037 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:49,037 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 18:33:49,037 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765889309] [2021-05-02 18:33:49,038 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 18:33:49,038 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:49,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 18:33:49,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 18:33:49,039 INFO L87 Difference]: Start difference. First operand 61 states and 66 transitions. Second operand has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 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) [2021-05-02 18:33:49,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:49,656 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2021-05-02 18:33:49,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 18:33:49,656 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 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 [2021-05-02 18:33:49,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:49,657 INFO L225 Difference]: With dead ends: 65 [2021-05-02 18:33:49,657 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 18:33:49,657 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 51 SyntacticMatches, 11 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 611.6ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:33:49,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 18:33:49,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2021-05-02 18:33:49,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.1016949152542372) internal successors, (65), 59 states have internal predecessors, (65), 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) [2021-05-02 18:33:49,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2021-05-02 18:33:49,661 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 59 [2021-05-02 18:33:49,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:49,661 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2021-05-02 18:33:49,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 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) [2021-05-02 18:33:49,662 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2021-05-02 18:33:49,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 18:33:49,662 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:49,662 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:49,867 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 18:33:49,867 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:49,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:49,868 INFO L82 PathProgramCache]: Analyzing trace with hash 537701784, now seen corresponding path program 12 times [2021-05-02 18:33:49,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:49,868 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1270314455] [2021-05-02 18:33:49,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:49,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:50,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:50,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:50,110 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 150 proven. 260 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:33:50,110 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:50,110 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1270314455] [2021-05-02 18:33:50,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1270314455] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:50,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1210286757] [2021-05-02 18:33:50,111 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 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 [2021-05-02 18:33:50,279 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 18:33:50,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:50,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 18:33:50,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:50,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:50,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:50,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:50,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:50,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:50,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:50,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:50,757 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 31 proven. 207 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 18:33:50,758 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1210286757] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:50,758 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:50,758 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14] total 29 [2021-05-02 18:33:50,758 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595876121] [2021-05-02 18:33:50,758 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 18:33:50,759 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:50,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 18:33:50,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=737, Unknown=0, NotChecked=0, Total=812 [2021-05-02 18:33:50,760 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand has 29 states, 28 states have (on average 2.75) internal successors, (77), 27 states have internal predecessors, (77), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:52,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:52,821 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2021-05-02 18:33:52,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 18:33:52,821 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.75) internal successors, (77), 27 states have internal predecessors, (77), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-02 18:33:52,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:52,822 INFO L225 Difference]: With dead ends: 76 [2021-05-02 18:33:52,822 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 18:33:52,823 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 1847.7ms TimeCoverageRelationStatistics Valid=292, Invalid=2360, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 18:33:52,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 18:33:52,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2021-05-02 18:33:52,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.1029411764705883) internal successors, (75), 68 states have internal predecessors, (75), 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) [2021-05-02 18:33:52,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 79 transitions. [2021-05-02 18:33:52,828 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 79 transitions. Word has length 62 [2021-05-02 18:33:52,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:52,828 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 79 transitions. [2021-05-02 18:33:52,828 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 2.75) internal successors, (77), 27 states have internal predecessors, (77), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:52,828 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 79 transitions. [2021-05-02 18:33:52,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 18:33:52,829 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:52,829 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:53,033 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:33:53,033 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:53,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:53,034 INFO L82 PathProgramCache]: Analyzing trace with hash 1274393893, now seen corresponding path program 13 times [2021-05-02 18:33:53,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:53,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638803126] [2021-05-02 18:33:53,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:53,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:53,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:53,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:53,345 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 219 proven. 345 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:33:53,346 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:53,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638803126] [2021-05-02 18:33:53,346 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638803126] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:53,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2068009956] [2021-05-02 18:33:53,346 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 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 [2021-05-02 18:33:53,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:53,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 18:33:53,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:53,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:53,564 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 219 proven. 345 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:33:53,565 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2068009956] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:53,565 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:53,565 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 18:33:53,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915301952] [2021-05-02 18:33:53,565 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 18:33:53,565 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:53,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 18:33:53,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:33:53,566 INFO L87 Difference]: Start difference. First operand 73 states and 79 transitions. Second operand has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 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) [2021-05-02 18:33:54,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:54,522 INFO L93 Difference]: Finished difference Result 77 states and 83 transitions. [2021-05-02 18:33:54,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 18:33:54,523 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 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 71 [2021-05-02 18:33:54,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:54,524 INFO L225 Difference]: With dead ends: 77 [2021-05-02 18:33:54,524 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 18:33:54,525 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 711.6ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:33:54,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 18:33:54,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2021-05-02 18:33:54,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.0985915492957747) internal successors, (78), 71 states have internal predecessors, (78), 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) [2021-05-02 18:33:54,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2021-05-02 18:33:54,540 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 71 [2021-05-02 18:33:54,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:54,540 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2021-05-02 18:33:54,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 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) [2021-05-02 18:33:54,542 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2021-05-02 18:33:54,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 18:33:54,542 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:54,542 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:54,743 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:33:54,743 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:54,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:54,744 INFO L82 PathProgramCache]: Analyzing trace with hash -1430063529, now seen corresponding path program 14 times [2021-05-02 18:33:54,744 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:54,744 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009466965] [2021-05-02 18:33:54,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:54,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:55,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:55,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:55,043 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 233 proven. 392 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:33:55,043 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:55,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009466965] [2021-05-02 18:33:55,043 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1009466965] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:55,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1308755541] [2021-05-02 18:33:55,043 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 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 [2021-05-02 18:33:55,116 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:33:55,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:55,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 18:33:55,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:55,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:55,268 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 233 proven. 392 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:33:55,268 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1308755541] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:55,268 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:55,269 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 18:33:55,269 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434651199] [2021-05-02 18:33:55,269 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 18:33:55,269 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:55,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 18:33:55,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 18:33:55,270 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 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) [2021-05-02 18:33:56,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:56,197 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2021-05-02 18:33:56,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 18:33:56,198 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 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 74 [2021-05-02 18:33:56,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:56,198 INFO L225 Difference]: With dead ends: 80 [2021-05-02 18:33:56,198 INFO L226 Difference]: Without dead ends: 80 [2021-05-02 18:33:56,199 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 701.6ms TimeCoverageRelationStatistics Valid=141, Invalid=1265, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 18:33:56,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-02 18:33:56,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2021-05-02 18:33:56,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 states have internal predecessors, (81), 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) [2021-05-02 18:33:56,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 85 transitions. [2021-05-02 18:33:56,202 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 85 transitions. Word has length 74 [2021-05-02 18:33:56,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:56,202 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 85 transitions. [2021-05-02 18:33:56,202 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 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) [2021-05-02 18:33:56,202 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 85 transitions. [2021-05-02 18:33:56,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 18:33:56,203 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:56,203 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 17, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:56,421 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 18:33:56,422 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:56,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:56,422 INFO L82 PathProgramCache]: Analyzing trace with hash -629616667, now seen corresponding path program 15 times [2021-05-02 18:33:56,422 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:56,422 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109392980] [2021-05-02 18:33:56,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:56,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:56,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:56,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:56,737 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 247 proven. 442 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:33:56,737 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:56,737 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109392980] [2021-05-02 18:33:56,737 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [109392980] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:56,737 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1466859680] [2021-05-02 18:33:56,737 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 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 [2021-05-02 18:33:56,819 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-05-02 18:33:56,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:56,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 18:33:56,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:56,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:57,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:57,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:57,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:57,258 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-05-02 18:33:57,259 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1466859680] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:57,259 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:57,259 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 11] total 30 [2021-05-02 18:33:57,259 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077984822] [2021-05-02 18:33:57,261 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 18:33:57,261 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:57,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 18:33:57,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=796, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:33:57,262 INFO L87 Difference]: Start difference. First operand 79 states and 85 transitions. Second operand has 30 states, 29 states have (on average 2.9310344827586206) internal successors, (85), 28 states have internal predecessors, (85), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:59,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:59,064 INFO L93 Difference]: Finished difference Result 89 states and 96 transitions. [2021-05-02 18:33:59,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 18:33:59,064 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 2.9310344827586206) internal successors, (85), 28 states have internal predecessors, (85), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-02 18:33:59,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:59,065 INFO L225 Difference]: With dead ends: 89 [2021-05-02 18:33:59,065 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 18:33:59,066 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 1484.6ms TimeCoverageRelationStatistics Valid=256, Invalid=2936, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 18:33:59,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 18:33:59,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-02 18:33:59,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.1) internal successors, (88), 80 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) [2021-05-02 18:33:59,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 92 transitions. [2021-05-02 18:33:59,068 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 92 transitions. Word has length 77 [2021-05-02 18:33:59,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:59,068 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 92 transitions. [2021-05-02 18:33:59,069 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 2.9310344827586206) internal successors, (85), 28 states have internal predecessors, (85), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:59,069 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 92 transitions. [2021-05-02 18:33:59,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 18:33:59,069 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:59,069 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 18, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:59,281 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:33:59,281 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:59,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:59,281 INFO L82 PathProgramCache]: Analyzing trace with hash -1025040378, now seen corresponding path program 16 times [2021-05-02 18:33:59,282 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:59,282 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [316454053] [2021-05-02 18:33:59,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:59,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:59,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:59,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:59,638 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 317 proven. 495 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:33:59,638 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:59,639 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [316454053] [2021-05-02 18:33:59,639 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [316454053] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:59,639 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1254293795] [2021-05-02 18:33:59,639 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 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 [2021-05-02 18:33:59,701 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:33:59,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:59,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 18:33:59,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:59,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:59,874 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 317 proven. 495 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:33:59,875 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1254293795] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:59,875 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:59,875 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 18:33:59,875 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563757753] [2021-05-02 18:33:59,876 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 18:33:59,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:59,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 18:33:59,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 18:33:59,877 INFO L87 Difference]: Start difference. First operand 85 states and 92 transitions. Second operand has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 states have internal predecessors, (70), 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) [2021-05-02 18:34:00,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:34:00,927 INFO L93 Difference]: Finished difference Result 89 states and 96 transitions. [2021-05-02 18:34:00,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 18:34:00,927 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 states have internal predecessors, (70), 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 83 [2021-05-02 18:34:00,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:34:00,928 INFO L225 Difference]: With dead ends: 89 [2021-05-02 18:34:00,928 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 18:34:00,929 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 801.1ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:34:00,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 18:34:00,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2021-05-02 18:34:00,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.0963855421686748) internal successors, (91), 83 states have internal predecessors, (91), 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) [2021-05-02 18:34:00,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 95 transitions. [2021-05-02 18:34:00,931 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 95 transitions. Word has length 83 [2021-05-02 18:34:00,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:34:00,932 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 95 transitions. [2021-05-02 18:34:00,932 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 states have internal predecessors, (70), 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) [2021-05-02 18:34:00,932 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 95 transitions. [2021-05-02 18:34:00,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 18:34:00,933 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:34:00,933 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 19, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:34:01,137 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 18:34:01,137 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:34:01,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:34:01,138 INFO L82 PathProgramCache]: Analyzing trace with hash 812787256, now seen corresponding path program 17 times [2021-05-02 18:34:01,138 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:34:01,138 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061740626] [2021-05-02 18:34:01,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:34:01,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:01,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:34:01,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:01,512 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 334 proven. 551 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:34:01,513 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:34:01,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061740626] [2021-05-02 18:34:01,513 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1061740626] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:01,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63617722] [2021-05-02 18:34:01,513 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 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 [2021-05-02 18:34:07,725 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 26 check-sat command(s) [2021-05-02 18:34:07,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:34:07,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 62 conjunts are in the unsatisfiable core [2021-05-02 18:34:07,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:34:08,092 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 334 proven. 551 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:34:08,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63617722] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:08,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:34:08,092 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 18:34:08,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2189963] [2021-05-02 18:34:08,093 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 18:34:08,093 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:34:08,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 18:34:08,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:34:08,094 INFO L87 Difference]: Start difference. First operand 88 states and 95 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) [2021-05-02 18:34:09,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:34:09,204 INFO L93 Difference]: Finished difference Result 92 states and 99 transitions. [2021-05-02 18:34:09,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 18:34:09,205 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 86 [2021-05-02 18:34:09,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:34:09,205 INFO L225 Difference]: With dead ends: 92 [2021-05-02 18:34:09,205 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 18:34:09,206 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 69 SyntacticMatches, 20 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1073.7ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 18:34:09,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 18:34:09,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2021-05-02 18:34:09,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0930232558139534) internal successors, (94), 86 states have internal predecessors, (94), 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) [2021-05-02 18:34:09,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2021-05-02 18:34:09,208 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 86 [2021-05-02 18:34:09,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:34:09,209 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2021-05-02 18:34:09,209 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) [2021-05-02 18:34:09,209 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2021-05-02 18:34:09,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 18:34:09,210 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:34:09,210 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 20, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:34:09,416 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 18:34:09,416 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:34:09,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:34:09,417 INFO L82 PathProgramCache]: Analyzing trace with hash -707257658, now seen corresponding path program 18 times [2021-05-02 18:34:09,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:34:09,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947097031] [2021-05-02 18:34:09,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:34:09,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:09,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:34:09,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:09,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 610 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:34:09,818 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:34:09,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947097031] [2021-05-02 18:34:09,818 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1947097031] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:09,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1955396990] [2021-05-02 18:34:09,818 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 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 [2021-05-02 18:34:10,218 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-02 18:34:10,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:34:10,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 18:34:10,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:34:10,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:10,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:10,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:10,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:11,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:11,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:11,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:11,176 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 145 proven. 511 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-05-02 18:34:11,176 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1955396990] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:11,176 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:34:11,176 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22] total 44 [2021-05-02 18:34:11,176 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324957059] [2021-05-02 18:34:11,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 18:34:11,177 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:34:11,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 18:34:11,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1747, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 18:34:11,178 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand has 44 states, 43 states have (on average 2.627906976744186) internal successors, (113), 42 states have internal predecessors, (113), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:34:14,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:34:14,431 INFO L93 Difference]: Finished difference Result 103 states and 111 transitions. [2021-05-02 18:34:14,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:34:14,432 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 2.627906976744186) internal successors, (113), 42 states have internal predecessors, (113), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-02 18:34:14,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:34:14,432 INFO L225 Difference]: With dead ends: 103 [2021-05-02 18:34:14,432 INFO L226 Difference]: Without dead ends: 100 [2021-05-02 18:34:14,433 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 3193.5ms TimeCoverageRelationStatistics Valid=566, Invalid=5134, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 18:34:14,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-02 18:34:14,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-05-02 18:34:14,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 95 states have (on average 1.0947368421052632) internal successors, (104), 95 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) [2021-05-02 18:34:14,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 108 transitions. [2021-05-02 18:34:14,436 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 108 transitions. Word has length 89 [2021-05-02 18:34:14,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:34:14,436 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 108 transitions. [2021-05-02 18:34:14,436 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 43 states have (on average 2.627906976744186) internal successors, (113), 42 states have internal predecessors, (113), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:34:14,436 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 108 transitions. [2021-05-02 18:34:14,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-02 18:34:14,437 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:34:14,437 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 22, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:34:14,640 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 18:34:14,641 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:34:14,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:34:14,641 INFO L82 PathProgramCache]: Analyzing trace with hash 267060151, now seen corresponding path program 19 times [2021-05-02 18:34:14,641 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:34:14,641 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [956260717] [2021-05-02 18:34:14,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:34:14,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:15,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:34:15,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:15,077 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 453 proven. 737 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:34:15,078 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:34:15,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [956260717] [2021-05-02 18:34:15,078 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [956260717] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:15,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [781644930] [2021-05-02 18:34:15,078 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 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 [2021-05-02 18:34:15,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:15,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 18:34:15,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:34:15,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:15,340 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 453 proven. 737 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:34:15,340 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [781644930] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:15,340 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:34:15,340 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2021-05-02 18:34:15,340 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310371135] [2021-05-02 18:34:15,341 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 18:34:15,341 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:34:15,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 18:34:15,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-02 18:34:15,342 INFO L87 Difference]: Start difference. First operand 100 states and 108 transitions. Second operand has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 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) [2021-05-02 18:34:16,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:34:16,733 INFO L93 Difference]: Finished difference Result 104 states and 112 transitions. [2021-05-02 18:34:16,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 18:34:16,735 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 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 [2021-05-02 18:34:16,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:34:16,736 INFO L225 Difference]: With dead ends: 104 [2021-05-02 18:34:16,736 INFO L226 Difference]: Without dead ends: 104 [2021-05-02 18:34:16,737 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 1029.5ms TimeCoverageRelationStatistics Valid=189, Invalid=2261, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:34:16,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-02 18:34:16,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2021-05-02 18:34:16,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.0918367346938775) internal successors, (107), 98 states have internal predecessors, (107), 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) [2021-05-02 18:34:16,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 111 transitions. [2021-05-02 18:34:16,740 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 111 transitions. Word has length 98 [2021-05-02 18:34:16,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:34:16,740 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 111 transitions. [2021-05-02 18:34:16,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 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) [2021-05-02 18:34:16,741 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 111 transitions. [2021-05-02 18:34:16,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 18:34:16,741 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:34:16,741 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 23, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:34:16,964 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 18:34:16,964 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:34:16,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:34:16,965 INFO L82 PathProgramCache]: Analyzing trace with hash -189754555, now seen corresponding path program 20 times [2021-05-02 18:34:16,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:34:16,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1229810890] [2021-05-02 18:34:16,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:34:16,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:17,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:34:17,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:17,443 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 473 proven. 805 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:34:17,443 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:34:17,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1229810890] [2021-05-02 18:34:17,443 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1229810890] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:17,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [588976335] [2021-05-02 18:34:17,443 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 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 [2021-05-02 18:34:17,501 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:34:17,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:34:17,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 18:34:17,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:34:17,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:17,678 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 473 proven. 805 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:34:17,679 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [588976335] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:17,679 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:34:17,679 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 18:34:17,679 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261485752] [2021-05-02 18:34:17,679 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 18:34:17,679 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:34:17,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 18:34:17,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:34:17,680 INFO L87 Difference]: Start difference. First operand 103 states and 111 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) [2021-05-02 18:34:19,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:34:19,242 INFO L93 Difference]: Finished difference Result 107 states and 115 transitions. [2021-05-02 18:34:19,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 18:34:19,242 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 101 [2021-05-02 18:34:19,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:34:19,243 INFO L225 Difference]: With dead ends: 107 [2021-05-02 18:34:19,243 INFO L226 Difference]: Without dead ends: 107 [2021-05-02 18:34:19,244 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 1169.4ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 18:34:19,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-02 18:34:19,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2021-05-02 18:34:19,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0891089108910892) internal successors, (110), 101 states have internal predecessors, (110), 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) [2021-05-02 18:34:19,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 114 transitions. [2021-05-02 18:34:19,246 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 114 transitions. Word has length 101 [2021-05-02 18:34:19,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:34:19,247 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 114 transitions. [2021-05-02 18:34:19,247 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) [2021-05-02 18:34:19,247 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 114 transitions. [2021-05-02 18:34:19,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-02 18:34:19,247 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:34:19,248 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:34:19,452 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:34:19,453 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:34:19,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:34:19,453 INFO L82 PathProgramCache]: Analyzing trace with hash 1594700023, now seen corresponding path program 21 times [2021-05-02 18:34:19,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:34:19,453 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641268075] [2021-05-02 18:34:19,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:34:19,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:19,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:34:19,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:19,979 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 493 proven. 876 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:34:19,979 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:34:19,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641268075] [2021-05-02 18:34:19,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1641268075] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:19,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1215172315] [2021-05-02 18:34:19,979 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 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 [2021-05-02 18:34:20,091 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-05-02 18:34:20,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:34:20,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 18:34:20,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:34:20,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:20,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:20,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:20,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:20,656 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 0 proven. 550 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2021-05-02 18:34:20,656 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1215172315] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:20,656 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:34:20,656 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 13] total 39 [2021-05-02 18:34:20,656 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58705831] [2021-05-02 18:34:20,657 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 18:34:20,657 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:34:20,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 18:34:20,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1383, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 18:34:20,658 INFO L87 Difference]: Start difference. First operand 106 states and 114 transitions. Second operand has 39 states, 38 states have (on average 2.9473684210526314) internal successors, (112), 37 states have internal predecessors, (112), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:34:23,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:34:23,232 INFO L93 Difference]: Finished difference Result 116 states and 125 transitions. [2021-05-02 18:34:23,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 18:34:23,233 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 2.9473684210526314) internal successors, (112), 37 states have internal predecessors, (112), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2021-05-02 18:34:23,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:34:23,234 INFO L225 Difference]: With dead ends: 116 [2021-05-02 18:34:23,234 INFO L226 Difference]: Without dead ends: 113 [2021-05-02 18:34:23,235 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 641 ImplicationChecksByTransitivity, 2158.4ms TimeCoverageRelationStatistics Valid=345, Invalid=5205, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 18:34:23,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-05-02 18:34:23,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 112. [2021-05-02 18:34:23,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 107 states have (on average 1.0934579439252337) internal successors, (117), 107 states have internal predecessors, (117), 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) [2021-05-02 18:34:23,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 121 transitions. [2021-05-02 18:34:23,238 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 121 transitions. Word has length 104 [2021-05-02 18:34:23,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:34:23,238 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 121 transitions. [2021-05-02 18:34:23,238 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 38 states have (on average 2.9473684210526314) internal successors, (112), 37 states have internal predecessors, (112), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:34:23,239 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 121 transitions. [2021-05-02 18:34:23,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 18:34:23,239 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:34:23,239 INFO L523 BasicCegarLoop]: trace histogram [33, 33, 25, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:34:23,452 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:34:23,453 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:34:23,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:34:23,453 INFO L82 PathProgramCache]: Analyzing trace with hash 232220376, now seen corresponding path program 22 times [2021-05-02 18:34:23,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:34:23,454 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398118991] [2021-05-02 18:34:23,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:34:23,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:23,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:34:23,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:23,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 590 proven. 950 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:34:23,931 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:34:23,931 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398118991] [2021-05-02 18:34:23,931 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398118991] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:23,931 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [507158491] [2021-05-02 18:34:23,931 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 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 [2021-05-02 18:34:23,990 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:34:23,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:34:23,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 18:34:23,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:34:24,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:24,200 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 590 proven. 950 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:34:24,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [507158491] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:24,200 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:34:24,200 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 18:34:24,201 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058769785] [2021-05-02 18:34:24,203 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 18:34:24,203 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:34:24,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 18:34:24,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:34:24,204 INFO L87 Difference]: Start difference. First operand 112 states and 121 transitions. Second operand has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 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) [2021-05-02 18:34:25,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:34:25,932 INFO L93 Difference]: Finished difference Result 116 states and 125 transitions. [2021-05-02 18:34:25,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 18:34:25,932 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 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 110 [2021-05-02 18:34:25,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:34:25,933 INFO L225 Difference]: With dead ends: 116 [2021-05-02 18:34:25,933 INFO L226 Difference]: Without dead ends: 116 [2021-05-02 18:34:25,933 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1228.8ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:34:25,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-02 18:34:25,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2021-05-02 18:34:25,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0909090909090908) internal successors, (120), 110 states have internal predecessors, (120), 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) [2021-05-02 18:34:25,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2021-05-02 18:34:25,936 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 110 [2021-05-02 18:34:25,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:34:25,936 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2021-05-02 18:34:25,936 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 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) [2021-05-02 18:34:25,936 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2021-05-02 18:34:25,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-02 18:34:25,937 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:34:25,937 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 26, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:34:26,156 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 18:34:26,157 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:34:26,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:34:26,157 INFO L82 PathProgramCache]: Analyzing trace with hash 1886130534, now seen corresponding path program 23 times [2021-05-02 18:34:26,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:34:26,157 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556154826] [2021-05-02 18:34:26,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:34:26,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:26,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:34:26,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:26,666 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 613 proven. 1027 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:34:26,666 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:34:26,666 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556154826] [2021-05-02 18:34:26,666 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1556154826] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:26,666 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903696986] [2021-05-02 18:34:26,666 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 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 [2021-05-02 18:34:56,506 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 35 check-sat command(s) [2021-05-02 18:34:56,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:34:56,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 60 conjunts are in the unsatisfiable core [2021-05-02 18:34:56,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:34:56,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:56,801 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 487 proven. 1190 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:34:56,801 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [903696986] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:56,801 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:34:56,801 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 31] total 33 [2021-05-02 18:34:56,801 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841497610] [2021-05-02 18:34:56,801 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 18:34:56,801 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:34:56,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 18:34:56,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=966, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 18:34:56,803 INFO L87 Difference]: Start difference. First operand 115 states and 124 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) [2021-05-02 18:34:58,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:34:58,791 INFO L93 Difference]: Finished difference Result 125 states and 134 transitions. [2021-05-02 18:34:58,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 18:34:58,792 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 113 [2021-05-02 18:34:58,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:34:58,792 INFO L225 Difference]: With dead ends: 125 [2021-05-02 18:34:58,792 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 18:34:58,793 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 1412.2ms TimeCoverageRelationStatistics Valid=233, Invalid=3549, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 18:34:58,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 18:34:58,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2021-05-02 18:34:58,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.084033613445378) internal successors, (129), 119 states have internal predecessors, (129), 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) [2021-05-02 18:34:58,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 133 transitions. [2021-05-02 18:34:58,795 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 133 transitions. Word has length 113 [2021-05-02 18:34:58,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:34:58,796 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 133 transitions. [2021-05-02 18:34:58,796 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) [2021-05-02 18:34:58,796 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 133 transitions. [2021-05-02 18:34:58,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-02 18:34:58,797 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:34:58,797 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 29, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:34:59,004 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:34:59,005 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:34:59,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:34:59,005 INFO L82 PathProgramCache]: Analyzing trace with hash 1263079768, now seen corresponding path program 24 times [2021-05-02 18:34:59,005 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:34:59,005 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294363262] [2021-05-02 18:34:59,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:34:59,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:59,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:34:59,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:59,648 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 682 proven. 1276 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:34:59,649 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:34:59,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294363262] [2021-05-02 18:34:59,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1294363262] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:59,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569710496] [2021-05-02 18:34:59,649 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 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 [2021-05-02 18:35:00,618 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 18:35:00,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:35:00,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-02 18:35:00,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:35:01,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:35:01,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:35:01,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:35:01,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:35:02,000 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 190 proven. 969 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2021-05-02 18:35:02,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [569710496] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:35:02,000 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:35:02,000 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 24] total 55 [2021-05-02 18:35:02,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011007419] [2021-05-02 18:35:02,001 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 18:35:02,001 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:35:02,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 18:35:02,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=2794, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 18:35:02,002 INFO L87 Difference]: Start difference. First operand 124 states and 133 transitions. Second operand has 55 states, 54 states have (on average 2.7037037037037037) internal successors, (146), 53 states have internal predecessors, (146), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:35:07,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:35:07,494 INFO L93 Difference]: Finished difference Result 136 states and 146 transitions. [2021-05-02 18:35:07,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 18:35:07,494 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 2.7037037037037037) internal successors, (146), 53 states have internal predecessors, (146), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 122 [2021-05-02 18:35:07,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:35:07,495 INFO L225 Difference]: With dead ends: 136 [2021-05-02 18:35:07,495 INFO L226 Difference]: Without dead ends: 133 [2021-05-02 18:35:07,497 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1180 ImplicationChecksByTransitivity, 5001.8ms TimeCoverageRelationStatistics Valid=776, Invalid=8730, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 18:35:07,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-02 18:35:07,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-05-02 18:35:07,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0859375) internal successors, (139), 128 states have internal predecessors, (139), 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) [2021-05-02 18:35:07,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 143 transitions. [2021-05-02 18:35:07,500 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 143 transitions. Word has length 122 [2021-05-02 18:35:07,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:35:07,501 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 143 transitions. [2021-05-02 18:35:07,501 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 54 states have (on average 2.7037037037037037) internal successors, (146), 53 states have internal predecessors, (146), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:35:07,501 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 143 transitions. [2021-05-02 18:35:07,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 18:35:07,502 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:35:07,502 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:35:07,706 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 18:35:07,707 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:35:07,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:35:07,707 INFO L82 PathProgramCache]: Analyzing trace with hash -400615067, now seen corresponding path program 25 times [2021-05-02 18:35:07,707 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:35:07,707 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [765317832] [2021-05-02 18:35:07,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:35:07,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:35:08,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:35:08,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:35:08,411 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 823 proven. 1457 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:35:08,412 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:35:08,412 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [765317832] [2021-05-02 18:35:08,412 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [765317832] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:35:08,412 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1300778796] [2021-05-02 18:35:08,412 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 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 [2021-05-02 18:35:08,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:35:08,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 18:35:08,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:35:08,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:35:08,694 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 823 proven. 1457 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:35:08,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1300778796] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:35:08,694 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:35:08,695 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 18:35:08,695 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266406040] [2021-05-02 18:35:08,695 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 18:35:08,695 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:35:08,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 18:35:08,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:35:08,696 INFO L87 Difference]: Start difference. First operand 133 states and 143 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) [2021-05-02 18:35:11,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:35:11,083 INFO L93 Difference]: Finished difference Result 137 states and 147 transitions. [2021-05-02 18:35:11,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:35:11,084 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 131 [2021-05-02 18:35:11,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:35:11,084 INFO L225 Difference]: With dead ends: 137 [2021-05-02 18:35:11,084 INFO L226 Difference]: Without dead ends: 137 [2021-05-02 18:35:11,085 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 1714.4ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 18:35:11,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-02 18:35:11,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2021-05-02 18:35:11,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.083969465648855) internal successors, (142), 131 states have internal predecessors, (142), 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) [2021-05-02 18:35:11,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 146 transitions. [2021-05-02 18:35:11,088 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 146 transitions. Word has length 131 [2021-05-02 18:35:11,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:35:11,089 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 146 transitions. [2021-05-02 18:35:11,089 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) [2021-05-02 18:35:11,089 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 146 transitions. [2021-05-02 18:35:11,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-05-02 18:35:11,090 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:35:11,090 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:35:11,296 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 18:35:11,297 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:35:11,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:35:11,297 INFO L82 PathProgramCache]: Analyzing trace with hash 371602327, now seen corresponding path program 26 times [2021-05-02 18:35:11,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:35:11,297 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1887586898] [2021-05-02 18:35:11,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:35:11,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:35:12,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:35:12,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:35:12,077 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 849 proven. 1552 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:35:12,077 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:35:12,077 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1887586898] [2021-05-02 18:35:12,077 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1887586898] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:35:12,077 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [298098336] [2021-05-02 18:35:12,078 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 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 [2021-05-02 18:35:12,133 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:35:12,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:35:12,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-02 18:35:12,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:35:12,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:35:12,363 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 849 proven. 1552 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:35:12,363 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [298098336] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:35:12,363 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:35:12,363 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-02 18:35:12,363 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878951587] [2021-05-02 18:35:12,363 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 18:35:12,364 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:35:12,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 18:35:12,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 18:35:12,364 INFO L87 Difference]: Start difference. First operand 136 states and 146 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) [2021-05-02 18:35:14,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:35:14,815 INFO L93 Difference]: Finished difference Result 140 states and 150 transitions. [2021-05-02 18:35:14,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 18:35:14,816 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 134 [2021-05-02 18:35:14,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:35:14,817 INFO L225 Difference]: With dead ends: 140 [2021-05-02 18:35:14,817 INFO L226 Difference]: Without dead ends: 140 [2021-05-02 18:35:14,817 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1830.2ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 18:35:14,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-02 18:35:14,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2021-05-02 18:35:14,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0820895522388059) internal successors, (145), 134 states have internal predecessors, (145), 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) [2021-05-02 18:35:14,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 149 transitions. [2021-05-02 18:35:14,820 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 149 transitions. Word has length 134 [2021-05-02 18:35:14,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:35:14,821 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 149 transitions. [2021-05-02 18:35:14,821 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) [2021-05-02 18:35:14,821 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 149 transitions. [2021-05-02 18:35:14,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 18:35:14,822 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:35:14,822 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 33, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:35:15,032 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 18:35:15,033 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:35:15,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:35:15,033 INFO L82 PathProgramCache]: Analyzing trace with hash 1655149605, now seen corresponding path program 27 times [2021-05-02 18:35:15,033 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:35:15,033 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526195895] [2021-05-02 18:35:15,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:35:15,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:35:15,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:35:15,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:35:15,760 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 875 proven. 1650 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:35:15,760 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:35:15,760 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526195895] [2021-05-02 18:35:15,761 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [526195895] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:35:15,761 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449508160] [2021-05-02 18:35:15,761 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 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 [2021-05-02 18:35:15,940 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-02 18:35:15,940 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:35:15,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 18:35:15,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:35:16,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:35:16,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:35:16,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:35:16,659 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2021-05-02 18:35:16,660 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449508160] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:35:16,660 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:35:16,660 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 15] total 50 [2021-05-02 18:35:16,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104978452] [2021-05-02 18:35:16,660 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 18:35:16,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:35:16,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 18:35:16,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2320, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:35:16,661 INFO L87 Difference]: Start difference. First operand 139 states and 149 transitions. Second operand has 50 states, 49 states have (on average 2.9591836734693877) internal successors, (145), 48 states have internal predecessors, (145), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:35:21,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:35:21,201 INFO L93 Difference]: Finished difference Result 149 states and 160 transitions. [2021-05-02 18:35:21,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 18:35:21,201 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 2.9591836734693877) internal successors, (145), 48 states have internal predecessors, (145), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 137 [2021-05-02 18:35:21,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:35:21,202 INFO L225 Difference]: With dead ends: 149 [2021-05-02 18:35:21,202 INFO L226 Difference]: Without dead ends: 146 [2021-05-02 18:35:21,203 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1093 ImplicationChecksByTransitivity, 3225.5ms TimeCoverageRelationStatistics Valid=456, Invalid=8856, Unknown=0, NotChecked=0, Total=9312 [2021-05-02 18:35:21,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-05-02 18:35:21,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2021-05-02 18:35:21,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.0857142857142856) internal successors, (152), 140 states have internal predecessors, (152), 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) [2021-05-02 18:35:21,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 156 transitions. [2021-05-02 18:35:21,206 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 156 transitions. Word has length 137 [2021-05-02 18:35:21,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:35:21,206 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 156 transitions. [2021-05-02 18:35:21,207 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 49 states have (on average 2.9591836734693877) internal successors, (145), 48 states have internal predecessors, (145), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:35:21,207 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 156 transitions. [2021-05-02 18:35:21,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-02 18:35:21,207 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:35:21,207 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 34, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:35:21,412 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 18:35:21,412 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:35:21,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:35:21,413 INFO L82 PathProgramCache]: Analyzing trace with hash -17220922, now seen corresponding path program 28 times [2021-05-02 18:35:21,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:35:21,413 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49217891] [2021-05-02 18:35:21,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:35:21,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:35:22,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:35:22,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:35:22,230 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 1005 proven. 1751 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:35:22,230 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:35:22,230 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49217891] [2021-05-02 18:35:22,230 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [49217891] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:35:22,230 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1633657173] [2021-05-02 18:35:22,230 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 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 [2021-05-02 18:35:22,287 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:35:22,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:35:22,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 85 conjunts are in the unsatisfiable core [2021-05-02 18:35:22,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:35:22,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:35:22,783 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 333 proven. 2542 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:35:22,783 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1633657173] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:35:22,783 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:35:22,783 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 44] total 46 [2021-05-02 18:35:22,783 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171465775] [2021-05-02 18:35:22,784 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 18:35:22,784 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:35:22,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 18:35:22,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1946, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 18:35:22,785 INFO L87 Difference]: Start difference. First operand 145 states and 156 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) [2021-05-02 18:35:26,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:35:26,631 INFO L93 Difference]: Finished difference Result 170 states and 181 transitions. [2021-05-02 18:35:26,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 18:35:26,632 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 [2021-05-02 18:35:26,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:35:26,633 INFO L225 Difference]: With dead ends: 170 [2021-05-02 18:35:26,633 INFO L226 Difference]: Without dead ends: 170 [2021-05-02 18:35:26,634 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 138 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 886 ImplicationChecksByTransitivity, 2605.5ms TimeCoverageRelationStatistics Valid=327, Invalid=7329, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 18:35:26,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-02 18:35:26,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2021-05-02 18:35:26,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.0731707317073171) internal successors, (176), 164 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) [2021-05-02 18:35:26,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 180 transitions. [2021-05-02 18:35:26,638 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 180 transitions. Word has length 143 [2021-05-02 18:35:26,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:35:26,638 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 180 transitions. [2021-05-02 18:35:26,639 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) [2021-05-02 18:35:26,639 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 180 transitions. [2021-05-02 18:35:26,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-02 18:35:26,639 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:35:26,640 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 42, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:35:26,852 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-05-02 18:35:26,853 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:35:26,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:35:26,853 INFO L82 PathProgramCache]: Analyzing trace with hash 566773190, now seen corresponding path program 29 times [2021-05-02 18:35:26,853 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:35:26,853 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807963170] [2021-05-02 18:35:26,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:35:26,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:35:28,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:35:28,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:35:28,061 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1237 proven. 2667 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:35:28,061 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:35:28,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807963170] [2021-05-02 18:35:28,061 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [807963170] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:35:28,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2143695850] [2021-05-02 18:35:28,062 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 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 [2021-05-02 18:40:50,602 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 53 check-sat command(s) [2021-05-02 18:40:50,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:40:50,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 136 conjunts are in the unsatisfiable core [2021-05-02 18:40:50,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:40:51,805 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1237 proven. 2667 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:40:51,806 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2143695850] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:40:51,806 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:40:51,806 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 18:40:51,806 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543055704] [2021-05-02 18:40:51,807 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 18:40:51,807 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:40:51,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 18:40:51,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 18:40:51,807 INFO L87 Difference]: Start difference. First operand 169 states and 180 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) [2021-05-02 18:40:55,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:40:55,848 INFO L93 Difference]: Finished difference Result 173 states and 184 transitions. [2021-05-02 18:40:55,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 18:40:55,848 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 167 [2021-05-02 18:40:55,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:40:55,849 INFO L225 Difference]: With dead ends: 173 [2021-05-02 18:40:55,850 INFO L226 Difference]: Without dead ends: 173 [2021-05-02 18:40:55,850 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 128 SyntacticMatches, 42 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 987 ImplicationChecksByTransitivity, 3685.7ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 18:40:55,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-05-02 18:40:55,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 172. [2021-05-02 18:40:55,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.0718562874251496) internal successors, (179), 167 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) [2021-05-02 18:40:55,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 183 transitions. [2021-05-02 18:40:55,854 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 183 transitions. Word has length 167 [2021-05-02 18:40:55,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:40:55,854 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 183 transitions. [2021-05-02 18:40:55,854 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) [2021-05-02 18:40:55,854 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 183 transitions. [2021-05-02 18:40:55,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-05-02 18:40:55,855 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:40:55,855 INFO L523 BasicCegarLoop]: trace histogram [53, 53, 43, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:40:56,057 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:40:56,057 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:40:56,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:40:56,057 INFO L82 PathProgramCache]: Analyzing trace with hash -91115784, now seen corresponding path program 30 times [2021-05-02 18:40:56,057 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:40:56,057 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812586314] [2021-05-02 18:40:56,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:40:56,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:40:57,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:40:57,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:40:57,189 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1266 proven. 2795 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:40:57,189 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:40:57,189 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812586314] [2021-05-02 18:40:57,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812586314] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:40:57,189 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1655102315] [2021-05-02 18:40:57,189 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 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 [2021-05-02 18:40:58,890 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 18:40:58,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:40:58,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 18:40:58,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:40:59,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:40:59,753 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:40:59,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:40:59,855 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 0 proven. 1392 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2021-05-02 18:40:59,856 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1655102315] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:40:59,856 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:40:59,856 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 16] total 61 [2021-05-02 18:40:59,856 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482916407] [2021-05-02 18:40:59,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-02 18:40:59,857 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:40:59,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-02 18:40:59,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=3498, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 18:40:59,858 INFO L87 Difference]: Start difference. First operand 172 states and 183 transitions. Second operand has 61 states, 60 states have (on average 2.966666666666667) internal successors, (178), 59 states have internal predecessors, (178), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:41:06,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:41:06,181 INFO L93 Difference]: Finished difference Result 182 states and 194 transitions. [2021-05-02 18:41:06,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-02 18:41:06,182 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 2.966666666666667) internal successors, (178), 59 states have internal predecessors, (178), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 170 [2021-05-02 18:41:06,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:41:06,183 INFO L225 Difference]: With dead ends: 182 [2021-05-02 18:41:06,183 INFO L226 Difference]: Without dead ends: 179 [2021-05-02 18:41:06,184 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1666 ImplicationChecksByTransitivity, 4657.9ms TimeCoverageRelationStatistics Valid=572, Invalid=13470, Unknown=0, NotChecked=0, Total=14042 [2021-05-02 18:41:06,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-02 18:41:06,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 178. [2021-05-02 18:41:06,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 173 states have (on average 1.0751445086705202) internal successors, (186), 173 states have internal predecessors, (186), 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) [2021-05-02 18:41:06,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 190 transitions. [2021-05-02 18:41:06,187 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 190 transitions. Word has length 170 [2021-05-02 18:41:06,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:41:06,187 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 190 transitions. [2021-05-02 18:41:06,188 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 60 states have (on average 2.966666666666667) internal successors, (178), 59 states have internal predecessors, (178), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:41:06,188 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 190 transitions. [2021-05-02 18:41:06,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-05-02 18:41:06,189 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:41:06,189 INFO L523 BasicCegarLoop]: trace histogram [55, 55, 44, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:41:06,394 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:41:06,394 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:41:06,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:41:06,394 INFO L82 PathProgramCache]: Analyzing trace with hash -1096759113, now seen corresponding path program 31 times [2021-05-02 18:41:06,394 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:41:06,395 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951635447] [2021-05-02 18:41:06,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:41:06,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:41:07,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:41:07,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:41:07,726 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1429 proven. 2926 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:41:07,726 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:41:07,726 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [951635447] [2021-05-02 18:41:07,726 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [951635447] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:41:07,726 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062811846] [2021-05-02 18:41:07,726 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 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 [2021-05-02 18:41:07,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:41:07,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 18:41:07,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:41:08,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:41:08,131 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1429 proven. 2926 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:41:08,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1062811846] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:41:08,132 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:41:08,132 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-02 18:41:08,132 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613391748] [2021-05-02 18:41:08,132 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 18:41:08,132 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:41:08,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 18:41:08,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 18:41:08,133 INFO L87 Difference]: Start difference. First operand 178 states and 190 transitions. Second operand has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 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) [2021-05-02 18:41:12,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:41:12,562 INFO L93 Difference]: Finished difference Result 182 states and 194 transitions. [2021-05-02 18:41:12,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 18:41:12,562 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 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 [2021-05-02 18:41:12,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:41:12,563 INFO L225 Difference]: With dead ends: 182 [2021-05-02 18:41:12,563 INFO L226 Difference]: Without dead ends: 182 [2021-05-02 18:41:12,564 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 178 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 3072.8ms TimeCoverageRelationStatistics Valid=365, Invalid=8377, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 18:41:12,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-05-02 18:41:12,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2021-05-02 18:41:12,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 176 states have (on average 1.0738636363636365) internal successors, (189), 176 states have internal predecessors, (189), 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) [2021-05-02 18:41:12,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 193 transitions. [2021-05-02 18:41:12,568 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 193 transitions. Word has length 176 [2021-05-02 18:41:12,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:41:12,568 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 193 transitions. [2021-05-02 18:41:12,568 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 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) [2021-05-02 18:41:12,568 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 193 transitions. [2021-05-02 18:41:12,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-02 18:41:12,569 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:41:12,569 INFO L523 BasicCegarLoop]: trace histogram [56, 56, 45, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:41:12,784 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-05-02 18:41:12,785 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:41:12,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:41:12,785 INFO L82 PathProgramCache]: Analyzing trace with hash -1917478971, now seen corresponding path program 32 times [2021-05-02 18:41:12,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:41:12,785 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580705690] [2021-05-02 18:41:12,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:41:12,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:41:14,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:41:14,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:41:14,199 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1461 proven. 3060 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:41:14,199 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:41:14,199 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580705690] [2021-05-02 18:41:14,199 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1580705690] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:41:14,199 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1509291957] [2021-05-02 18:41:14,199 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:41:14,278 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:41:14,278 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:41:14,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 93 conjunts are in the unsatisfiable core [2021-05-02 18:41:14,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:41:14,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:41:14,578 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1461 proven. 3060 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:41:14,578 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1509291957] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:41:14,578 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:41:14,578 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 18:41:14,578 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287848224] [2021-05-02 18:41:14,579 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 18:41:14,579 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:41:14,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 18:41:14,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:41:14,580 INFO L87 Difference]: Start difference. First operand 181 states and 193 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) [2021-05-02 18:41:19,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:41:19,156 INFO L93 Difference]: Finished difference Result 185 states and 197 transitions. [2021-05-02 18:41:19,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 18:41:19,160 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 179 [2021-05-02 18:41:19,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:41:19,162 INFO L225 Difference]: With dead ends: 185 [2021-05-02 18:41:19,162 INFO L226 Difference]: Without dead ends: 185 [2021-05-02 18:41:19,162 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 181 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1039 ImplicationChecksByTransitivity, 3213.3ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 18:41:19,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-02 18:41:19,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2021-05-02 18:41:19,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 179 states have (on average 1.0726256983240223) internal successors, (192), 179 states have internal predecessors, (192), 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) [2021-05-02 18:41:19,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 196 transitions. [2021-05-02 18:41:19,168 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 196 transitions. Word has length 179 [2021-05-02 18:41:19,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:41:19,168 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 196 transitions. [2021-05-02 18:41:19,169 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) [2021-05-02 18:41:19,169 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 196 transitions. [2021-05-02 18:41:19,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-05-02 18:41:19,169 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:41:19,170 INFO L523 BasicCegarLoop]: trace histogram [57, 57, 46, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:41:19,393 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 18:41:19,393 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:41:19,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:41:19,394 INFO L82 PathProgramCache]: Analyzing trace with hash -733952521, now seen corresponding path program 33 times [2021-05-02 18:41:19,394 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:41:19,394 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387488747] [2021-05-02 18:41:19,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:41:19,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:41:20,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:41:20,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:41:20,627 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1493 proven. 3197 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:41:20,627 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:41:20,627 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387488747] [2021-05-02 18:41:20,627 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1387488747] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:41:20,627 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [577660603] [2021-05-02 18:41:20,628 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:41:20,858 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-02 18:41:20,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:41:20,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 18:41:20,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:41:21,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:41:21,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:41:21,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:41:21,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:41:22,005 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 0 proven. 1648 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2021-05-02 18:41:22,005 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [577660603] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:41:22,005 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:41:22,005 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 18] total 66 [2021-05-02 18:41:22,005 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164337990] [2021-05-02 18:41:22,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 18:41:22,006 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:41:22,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 18:41:22,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=4114, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:41:22,007 INFO L87 Difference]: Start difference. First operand 184 states and 196 transitions. Second operand has 66 states, 65 states have (on average 2.923076923076923) internal successors, (190), 64 states have internal predecessors, (190), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:41:29,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:41:29,940 INFO L93 Difference]: Finished difference Result 195 states and 208 transitions. [2021-05-02 18:41:29,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-02 18:41:29,943 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 65 states have (on average 2.923076923076923) internal successors, (190), 64 states have internal predecessors, (190), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 182 [2021-05-02 18:41:29,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:41:29,943 INFO L225 Difference]: With dead ends: 195 [2021-05-02 18:41:29,943 INFO L226 Difference]: Without dead ends: 192 [2021-05-02 18:41:29,944 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2032 ImplicationChecksByTransitivity, 5345.8ms TimeCoverageRelationStatistics Valid=620, Invalid=15892, Unknown=0, NotChecked=0, Total=16512 [2021-05-02 18:41:29,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-05-02 18:41:29,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2021-05-02 18:41:29,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 185 states have (on average 1.0756756756756756) internal successors, (199), 185 states have internal predecessors, (199), 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) [2021-05-02 18:41:29,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 203 transitions. [2021-05-02 18:41:29,948 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 203 transitions. Word has length 182 [2021-05-02 18:41:29,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:41:29,948 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 203 transitions. [2021-05-02 18:41:29,948 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 65 states have (on average 2.923076923076923) internal successors, (190), 64 states have internal predecessors, (190), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:41:29,949 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 203 transitions. [2021-05-02 18:41:29,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-05-02 18:41:29,949 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:41:29,949 INFO L523 BasicCegarLoop]: trace histogram [59, 59, 47, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:41:30,153 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-02 18:41:30,154 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:41:30,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:41:30,154 INFO L82 PathProgramCache]: Analyzing trace with hash 1637868120, now seen corresponding path program 34 times [2021-05-02 18:41:30,154 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:41:30,154 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1162837561] [2021-05-02 18:41:30,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:41:30,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:41:31,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:41:31,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:41:31,602 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1668 proven. 3337 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 18:41:31,602 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:41:31,603 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1162837561] [2021-05-02 18:41:31,603 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1162837561] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:41:31,603 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1845743728] [2021-05-02 18:41:31,603 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:41:31,676 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:41:31,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:41:31,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 97 conjunts are in the unsatisfiable core [2021-05-02 18:41:31,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:41:31,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:41:31,997 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1668 proven. 3337 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 18:41:31,997 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1845743728] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:41:31,997 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:41:31,997 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50] total 52 [2021-05-02 18:41:31,998 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473707805] [2021-05-02 18:41:31,998 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 18:41:31,998 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:41:31,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 18:41:31,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 18:41:31,999 INFO L87 Difference]: Start difference. First operand 190 states and 203 transitions. Second operand has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 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) [2021-05-02 18:41:36,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:41:36,959 INFO L93 Difference]: Finished difference Result 194 states and 207 transitions. [2021-05-02 18:41:36,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 18:41:36,960 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 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 188 [2021-05-02 18:41:36,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:41:36,961 INFO L225 Difference]: With dead ends: 194 [2021-05-02 18:41:36,961 INFO L226 Difference]: Without dead ends: 194 [2021-05-02 18:41:36,962 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 190 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1132 ImplicationChecksByTransitivity, 3362.2ms TimeCoverageRelationStatistics Valid=389, Invalid=9511, Unknown=0, NotChecked=0, Total=9900 [2021-05-02 18:41:36,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-02 18:41:36,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2021-05-02 18:41:36,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.074468085106383) internal successors, (202), 188 states have internal predecessors, (202), 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) [2021-05-02 18:41:36,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 206 transitions. [2021-05-02 18:41:36,965 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 206 transitions. Word has length 188 [2021-05-02 18:41:36,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:41:36,966 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 206 transitions. [2021-05-02 18:41:36,966 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 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) [2021-05-02 18:41:36,966 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 206 transitions. [2021-05-02 18:41:36,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-02 18:41:36,967 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:41:36,967 INFO L523 BasicCegarLoop]: trace histogram [60, 60, 48, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:41:37,180 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-05-02 18:41:37,181 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:41:37,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:41:37,182 INFO L82 PathProgramCache]: Analyzing trace with hash 807439462, now seen corresponding path program 35 times [2021-05-02 18:41:37,182 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:41:37,182 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501914349] [2021-05-02 18:41:37,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:41:37,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:41:38,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:41:38,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:41:38,585 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1703 proven. 3480 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 18:41:38,585 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:41:38,585 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501914349] [2021-05-02 18:41:38,585 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [501914349] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:41:38,585 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [730827385] [2021-05-02 18:41:38,585 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true