/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_11.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:47:50,696 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:47:50,699 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:47:50,737 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 18:47:50,737 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 18:47:50,739 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 18:47:50,766 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 18:47:50,773 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 18:47:50,774 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 18:47:50,775 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 18:47:50,776 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 18:47:50,777 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 18:47:50,778 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 18:47:50,779 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 18:47:50,780 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 18:47:50,781 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 18:47:50,781 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 18:47:50,782 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 18:47:50,784 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 18:47:50,785 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 18:47:50,787 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 18:47:50,788 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 18:47:50,789 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 18:47:50,789 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 18:47:50,792 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 18:47:50,792 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 18:47:50,794 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 18:47:50,795 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 18:47:50,796 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 18:47:50,797 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 18:47:50,797 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 18:47:50,798 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 18:47:50,799 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 18:47:50,799 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 18:47:50,800 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 18:47:50,801 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 18:47:50,801 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 18:47:50,801 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 18:47:50,802 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:47:50,803 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:47:50,803 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:47:50,804 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:47:50,815 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:47:50,816 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:47:50,817 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:47:50,817 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:47:50,818 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:47:50,818 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:47:50,818 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:47:50,818 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:47:50,818 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:47:50,819 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:47:50,819 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:47:50,819 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:47:50,819 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:47:50,819 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:47:50,820 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:47:50,820 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:47:50,820 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:47:50,820 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:47:50,820 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:47:50,821 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:47:50,821 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:47:50,822 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:47:50,822 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:47:51,190 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:47:51,212 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:47:51,215 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:47:51,217 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:47:51,217 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:47:51,218 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_11.c [2021-05-02 18:47:51,283 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b32c21b53/875c4991e2164b76bc8531bbacf9d5cf/FLAG6a802ad81 [2021-05-02 18:47:51,831 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:47:51,831 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_11.c [2021-05-02 18:47:51,838 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b32c21b53/875c4991e2164b76bc8531bbacf9d5cf/FLAG6a802ad81 [2021-05-02 18:47:52,310 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b32c21b53/875c4991e2164b76bc8531bbacf9d5cf [2021-05-02 18:47:52,315 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:47:52,316 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:47:52,317 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:47:52,318 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:47:52,323 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:47:52,324 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:47:52" (1/1) ... [2021-05-02 18:47:52,326 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c4baf5a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:47:52, skipping insertion in model container [2021-05-02 18:47:52,326 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:47:52" (1/1) ... [2021-05-02 18:47:52,333 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:47:52,347 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:47:52,454 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_11.c[319,332] [2021-05-02 18:47:52,469 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:47:52,480 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:47:52,500 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_11.c[319,332] [2021-05-02 18:47:52,504 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:47:52,542 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:47:52,543 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:47:52 WrapperNode [2021-05-02 18:47:52,543 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:47:52,544 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:47:52,544 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:47:52,544 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:47:52,555 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:47:52" (1/1) ... [2021-05-02 18:47:52,556 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:47:52" (1/1) ... [2021-05-02 18:47:52,563 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:47:52" (1/1) ... [2021-05-02 18:47:52,563 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:47:52" (1/1) ... [2021-05-02 18:47:52,567 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:47:52" (1/1) ... [2021-05-02 18:47:52,570 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:47:52" (1/1) ... [2021-05-02 18:47:52,573 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:47:52" (1/1) ... [2021-05-02 18:47:52,577 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:47:52,578 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:47:52,578 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:47:52,578 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:47:52,579 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:47:52" (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 18:47:52,674 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:47:52,674 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:47:52,674 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:47:52,674 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:47:52,675 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:47:52,675 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:47:52,675 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:47:52,675 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:47:52,676 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:47:52,676 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:47:52,676 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:47:52,677 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:47:52,677 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:47:52,677 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:47:52,677 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:47:52,677 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:47:52,677 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:47:52,925 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:47:52,925 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 18:47:52,927 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:47:52 BoogieIcfgContainer [2021-05-02 18:47:52,927 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:47:52,928 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:47:52,928 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:47:52,929 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:47:52,931 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:47:52" (1/1) ... [2021-05-02 18:47:52,958 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:47:52 BasicIcfg [2021-05-02 18:47:52,959 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:47:52,962 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:47:52,963 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:47:52,966 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:47:52,966 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:47:52" (1/4) ... [2021-05-02 18:47:52,967 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f5e2476 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:47:52, skipping insertion in model container [2021-05-02 18:47:52,967 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:47:52" (2/4) ... [2021-05-02 18:47:52,967 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f5e2476 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:47:52, skipping insertion in model container [2021-05-02 18:47:52,967 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:47:52" (3/4) ... [2021-05-02 18:47:52,970 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f5e2476 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:47:52, skipping insertion in model container [2021-05-02 18:47:52,970 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:47:52" (4/4) ... [2021-05-02 18:47:52,971 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_11.cJordan [2021-05-02 18:47:52,977 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:47:52,981 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:47:52,998 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:47:53,027 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:47:53,027 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:47:53,027 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:47:53,027 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:47:53,027 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:47:53,028 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:47:53,028 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:47:53,028 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:47:53,048 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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 18:47:53,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:47:53,059 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:47:53,060 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:47:53,060 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:47:53,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:47:53,066 INFO L82 PathProgramCache]: Analyzing trace with hash -154368955, now seen corresponding path program 1 times [2021-05-02 18:47:53,074 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:47:53,075 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155093105] [2021-05-02 18:47:53,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:47:53,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:53,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:47:53,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:53,312 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 18:47:53,312 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:47:53,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155093105] [2021-05-02 18:47:53,313 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [155093105] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:47:53,314 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:47:53,314 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 18:47:53,315 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921026153] [2021-05-02 18:47:53,319 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:47:53,319 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:47:53,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:47:53,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:47:53,333 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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 18:47:53,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:47:53,390 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2021-05-02 18:47:53,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:47:53,392 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 18:47:53,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:47:53,399 INFO L225 Difference]: With dead ends: 20 [2021-05-02 18:47:53,399 INFO L226 Difference]: Without dead ends: 13 [2021-05-02 18:47:53,401 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 31.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:47:53,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-02 18:47:53,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-02 18:47:53,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 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 18:47:53,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-05-02 18:47:53,468 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2021-05-02 18:47:53,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:47:53,469 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-05-02 18:47:53,469 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 18:47:53,469 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-05-02 18:47:53,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:47:53,469 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:47:53,470 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:47:53,470 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:47:53,470 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:47:53,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:47:53,471 INFO L82 PathProgramCache]: Analyzing trace with hash -153445434, now seen corresponding path program 1 times [2021-05-02 18:47:53,471 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:47:53,471 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9464234] [2021-05-02 18:47:53,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:47:53,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:53,610 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:47:53,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:53,621 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 18:47:53,621 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:47:53,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9464234] [2021-05-02 18:47:53,621 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [9464234] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:47:53,622 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:47:53,622 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:47:53,622 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982588441] [2021-05-02 18:47:53,623 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:47:53,624 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:47:53,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:47:53,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:47:53,625 INFO L87 Difference]: Start difference. First operand 13 states and 14 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 18:47:53,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:47:53,696 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2021-05-02 18:47:53,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:47:53,697 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 18:47:53,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:47:53,698 INFO L225 Difference]: With dead ends: 15 [2021-05-02 18:47:53,699 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 18:47:53,700 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 76.9ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 18:47:53,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 18:47:53,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 18:47:53,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 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 18:47:53,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-02 18:47:53,709 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-02 18:47:53,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:47:53,709 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-02 18:47:53,709 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 18:47:53,710 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-02 18:47:53,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 18:47:53,711 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:47:53,711 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:47:53,712 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:47:53,713 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:47:53,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:47:53,714 INFO L82 PathProgramCache]: Analyzing trace with hash -521762940, now seen corresponding path program 1 times [2021-05-02 18:47:53,714 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:47:53,715 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264035882] [2021-05-02 18:47:53,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:47:53,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:53,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:47:53,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:53,861 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 18:47:53,862 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:47:53,862 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264035882] [2021-05-02 18:47:53,862 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1264035882] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:53,862 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1670125261] [2021-05-02 18:47:53,862 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 18:47:53,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:53,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:47:53,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:47:54,011 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 18:47:54,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1670125261] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:54,012 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:47:54,012 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 18:47:54,012 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900040007] [2021-05-02 18:47:54,013 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:47:54,013 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:47:54,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:47:54,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:47:54,018 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 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 18:47:54,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:47:54,120 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-05-02 18:47:54,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 18:47:54,120 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 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 13 [2021-05-02 18:47:54,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:47:54,122 INFO L225 Difference]: With dead ends: 17 [2021-05-02 18:47:54,122 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 18:47:54,123 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 94.0ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:47:54,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 18:47:54,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 18:47:54,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 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 18:47:54,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-02 18:47:54,128 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2021-05-02 18:47:54,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:47:54,128 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-02 18:47:54,128 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 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 18:47:54,129 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-02 18:47:54,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 18:47:54,129 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:47:54,129 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:47:54,337 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 18:47:54,337 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:47:54,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:47:54,338 INFO L82 PathProgramCache]: Analyzing trace with hash 2007399362, now seen corresponding path program 2 times [2021-05-02 18:47:54,338 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:47:54,338 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456971757] [2021-05-02 18:47:54,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:47:54,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:54,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:47:54,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:54,479 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:47:54,480 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:47:54,480 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456971757] [2021-05-02 18:47:54,480 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456971757] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:54,480 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2101588305] [2021-05-02 18:47:54,480 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:47:54,535 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:47:54,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:47:54,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 18:47:54,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:47:54,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:47:54,652 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:47:54,653 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2101588305] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:54,653 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:47:54,653 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 18:47:54,654 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182715017] [2021-05-02 18:47:54,654 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 18:47:54,655 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:47:54,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 18:47:54,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 18:47:54,661 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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 18:47:54,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:47:54,850 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-05-02 18:47:54,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:47:54,850 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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 15 [2021-05-02 18:47:54,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:47:54,851 INFO L225 Difference]: With dead ends: 19 [2021-05-02 18:47:54,851 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 18:47:54,852 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 197.5ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:47:54,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 18:47:54,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 18:47:54,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:47:54,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 18:47:54,855 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2021-05-02 18:47:54,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:47:54,855 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 18:47:54,855 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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 18:47:54,855 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 18:47:54,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 18:47:54,856 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:47:54,856 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:47:55,057 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:47:55,057 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:47:55,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:47:55,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1580882048, now seen corresponding path program 3 times [2021-05-02 18:47:55,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:47:55,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383906641] [2021-05-02 18:47:55,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:47:55,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:55,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:47:55,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:55,174 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:47:55,174 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:47:55,175 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [383906641] [2021-05-02 18:47:55,175 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [383906641] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:55,175 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477414054] [2021-05-02 18:47:55,175 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:47:55,224 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 18:47:55,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:47:55,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 18:47:55,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:47:55,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:47:55,278 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 18:47:55,278 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1477414054] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:47:55,279 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:47:55,279 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7] total 8 [2021-05-02 18:47:55,279 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597645185] [2021-05-02 18:47:55,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:47:55,279 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:47:55,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:47:55,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:47:55,280 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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 18:47:55,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:47:55,315 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2021-05-02 18:47:55,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:47:55,316 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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 17 [2021-05-02 18:47:55,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:47:55,317 INFO L225 Difference]: With dead ends: 21 [2021-05-02 18:47:55,317 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 18:47:55,317 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 67.4ms TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:47:55,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 18:47:55,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-05-02 18:47:55,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 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 18:47:55,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-05-02 18:47:55,320 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2021-05-02 18:47:55,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:47:55,321 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-05-02 18:47:55,321 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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 18:47:55,321 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-05-02 18:47:55,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 18:47:55,322 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:47:55,322 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:47:55,533 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:47:55,533 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:47:55,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:47:55,534 INFO L82 PathProgramCache]: Analyzing trace with hash -251734435, now seen corresponding path program 1 times [2021-05-02 18:47:55,534 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:47:55,534 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021041381] [2021-05-02 18:47:55,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:47:55,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:55,635 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:47:55,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:55,643 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:47:55,643 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:47:55,643 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021041381] [2021-05-02 18:47:55,643 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021041381] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:55,643 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [993340968] [2021-05-02 18:47:55,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:47:55,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:55,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 18:47:55,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:47:55,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:47:55,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:47:55,792 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:47:55,793 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [993340968] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:55,793 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:47:55,793 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 18:47:55,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096350758] [2021-05-02 18:47:55,794 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 18:47:55,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:47:55,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 18:47:55,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:47:55,796 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 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 18:47:55,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:47:55,999 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-05-02 18:47:55,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:47:56,000 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 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 19 [2021-05-02 18:47:56,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:47:56,001 INFO L225 Difference]: With dead ends: 22 [2021-05-02 18:47:56,001 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 18:47:56,001 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 211.2ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:47:56,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 18:47:56,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 18:47:56,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:47:56,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-02 18:47:56,004 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 19 [2021-05-02 18:47:56,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:47:56,005 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-02 18:47:56,005 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 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 18:47:56,005 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-02 18:47:56,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 18:47:56,005 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:47:56,006 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:47:56,222 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:47:56,223 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:47:56,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:47:56,224 INFO L82 PathProgramCache]: Analyzing trace with hash 2092573723, now seen corresponding path program 2 times [2021-05-02 18:47:56,224 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:47:56,224 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438208169] [2021-05-02 18:47:56,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:47:56,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:56,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:47:56,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:56,336 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:47:56,336 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:47:56,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438208169] [2021-05-02 18:47:56,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [438208169] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:56,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [45629643] [2021-05-02 18:47:56,337 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:47:56,379 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:47:56,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:47:56,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 18:47:56,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:47:56,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:47:56,464 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:47:56,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [45629643] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:56,464 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:47:56,464 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-05-02 18:47:56,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656752435] [2021-05-02 18:47:56,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 18:47:56,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:47:56,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 18:47:56,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:47:56,466 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 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 18:47:56,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:47:56,687 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2021-05-02 18:47:56,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:47:56,687 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 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 21 [2021-05-02 18:47:56,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:47:56,688 INFO L225 Difference]: With dead ends: 24 [2021-05-02 18:47:56,688 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 18:47:56,688 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 216.7ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:47:56,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 18:47:56,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 18:47:56,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 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 18:47:56,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-02 18:47:56,691 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 21 [2021-05-02 18:47:56,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:47:56,692 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-02 18:47:56,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 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 18:47:56,692 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-02 18:47:56,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 18:47:56,693 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:47:56,693 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:47:56,897 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 18:47:56,897 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:47:56,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:47:56,897 INFO L82 PathProgramCache]: Analyzing trace with hash 114883161, now seen corresponding path program 3 times [2021-05-02 18:47:56,898 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:47:56,898 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741936708] [2021-05-02 18:47:56,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:47:56,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:56,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:47:56,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:57,011 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:47:57,011 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:47:57,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741936708] [2021-05-02 18:47:57,011 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1741936708] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:57,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [258960288] [2021-05-02 18:47:57,011 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:47:57,070 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 18:47:57,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:47:57,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 18:47:57,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:47:57,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:47:57,155 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 18:47:57,155 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [258960288] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:57,156 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:47:57,156 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 4] total 11 [2021-05-02 18:47:57,156 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489761825] [2021-05-02 18:47:57,156 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:47:57,156 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:47:57,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:47:57,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:47:57,157 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 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 18:47:57,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:47:57,579 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-02 18:47:57,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:47:57,579 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 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 23 [2021-05-02 18:47:57,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:47:57,581 INFO L225 Difference]: With dead ends: 31 [2021-05-02 18:47:57,581 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 18:47:57,581 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 395.7ms TimeCoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:47:57,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 18:47:57,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2021-05-02 18:47:57,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 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 18:47:57,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-05-02 18:47:57,584 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2021-05-02 18:47:57,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:47:57,584 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-05-02 18:47:57,585 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 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 18:47:57,585 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-05-02 18:47:57,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 18:47:57,585 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:47:57,585 INFO L523 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:47:57,800 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:47:57,801 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:47:57,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:47:57,801 INFO L82 PathProgramCache]: Analyzing trace with hash 44690740, now seen corresponding path program 4 times [2021-05-02 18:47:57,802 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:47:57,802 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1528981685] [2021-05-02 18:47:57,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:47:57,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:57,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:47:57,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:57,946 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:47:57,947 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:47:57,947 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1528981685] [2021-05-02 18:47:57,947 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1528981685] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:57,947 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770190099] [2021-05-02 18:47:57,947 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:47:57,987 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:47:57,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:47:57,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 18:47:57,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:47:58,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:47:58,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:47:58,105 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:47:58,106 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770190099] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:58,106 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:47:58,106 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 18:47:58,106 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140499577] [2021-05-02 18:47:58,107 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:47:58,107 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:47:58,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:47:58,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:47:58,108 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 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 18:47:58,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:47:58,373 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-05-02 18:47:58,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:47:58,373 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 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 27 [2021-05-02 18:47:58,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:47:58,374 INFO L225 Difference]: With dead ends: 30 [2021-05-02 18:47:58,374 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 18:47:58,375 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 264.4ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:47:58,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 18:47:58,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 18:47:58,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.12) internal successors, (28), 25 states have internal predecessors, (28), 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 18:47:58,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-05-02 18:47:58,378 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2021-05-02 18:47:58,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:47:58,378 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-05-02 18:47:58,378 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 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 18:47:58,378 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-05-02 18:47:58,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 18:47:58,379 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:47:58,379 INFO L523 BasicCegarLoop]: trace histogram [9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:47:58,592 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:47:58,592 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:47:58,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:47:58,593 INFO L82 PathProgramCache]: Analyzing trace with hash 1133681906, now seen corresponding path program 5 times [2021-05-02 18:47:58,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:47:58,593 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1865247817] [2021-05-02 18:47:58,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:47:58,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:58,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:47:58,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:58,755 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:47:58,756 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:47:58,756 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1865247817] [2021-05-02 18:47:58,756 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1865247817] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:58,756 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [730046195] [2021-05-02 18:47:58,756 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:47:58,815 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 18:47:58,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:47:58,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 18:47:58,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:47:58,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:47:58,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:47:58,946 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:47:58,946 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [730046195] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:58,946 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:47:58,947 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 18:47:58,947 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701037803] [2021-05-02 18:47:58,948 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 18:47:58,948 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:47:58,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 18:47:58,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:47:58,950 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:47:59,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:47:59,311 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2021-05-02 18:47:59,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 18:47:59,311 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 18:47:59,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:47:59,312 INFO L225 Difference]: With dead ends: 32 [2021-05-02 18:47:59,312 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 18:47:59,312 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 27 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 332.5ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:47:59,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 18:47:59,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 18:47:59,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 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 18:47:59,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2021-05-02 18:47:59,315 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2021-05-02 18:47:59,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:47:59,316 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2021-05-02 18:47:59,316 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:47:59,316 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2021-05-02 18:47:59,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 18:47:59,317 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:47:59,317 INFO L523 BasicCegarLoop]: trace histogram [10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:47:59,529 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 18:47:59,529 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:47:59,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:47:59,530 INFO L82 PathProgramCache]: Analyzing trace with hash -317827792, now seen corresponding path program 6 times [2021-05-02 18:47:59,530 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:47:59,530 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1520452987] [2021-05-02 18:47:59,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:47:59,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:59,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:47:59,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:47:59,701 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 72 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:47:59,701 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:47:59,701 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1520452987] [2021-05-02 18:47:59,701 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1520452987] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:59,701 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [232225218] [2021-05-02 18:47:59,701 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:47:59,845 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2021-05-02 18:47:59,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:47:59,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 18:47:59,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:47:59,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:47:59,972 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:47:59,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [232225218] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:47:59,973 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:47:59,973 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 15 [2021-05-02 18:47:59,973 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026999029] [2021-05-02 18:47:59,974 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 18:47:59,974 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:47:59,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 18:47:59,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:47:59,975 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 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 18:48:00,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:00,364 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-05-02 18:48:00,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:48:00,364 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 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 31 [2021-05-02 18:48:00,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:00,365 INFO L225 Difference]: With dead ends: 34 [2021-05-02 18:48:00,365 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 18:48:00,366 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 354.6ms TimeCoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:48:00,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 18:48:00,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 18:48:00,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 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 18:48:00,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-05-02 18:48:00,369 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2021-05-02 18:48:00,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:00,369 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-05-02 18:48:00,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 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 18:48:00,369 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-05-02 18:48:00,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 18:48:00,370 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:00,370 INFO L523 BasicCegarLoop]: trace histogram [11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:00,573 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:00,573 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:00,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:00,574 INFO L82 PathProgramCache]: Analyzing trace with hash 645723630, now seen corresponding path program 7 times [2021-05-02 18:48:00,574 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:00,574 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [422628769] [2021-05-02 18:48:00,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:00,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:00,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:00,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:00,758 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:48:00,758 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:00,758 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [422628769] [2021-05-02 18:48:00,758 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [422628769] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:00,758 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [521027984] [2021-05-02 18:48:00,758 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:00,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:00,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 18:48:00,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:00,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:00,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:00,914 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:48:00,914 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [521027984] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:00,914 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:00,915 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 18:48:00,915 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774954387] [2021-05-02 18:48:00,916 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:48:00,916 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:00,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:48:00,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:48:00,917 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 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 18:48:01,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:01,338 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-05-02 18:48:01,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:48:01,339 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 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 33 [2021-05-02 18:48:01,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:01,340 INFO L225 Difference]: With dead ends: 36 [2021-05-02 18:48:01,340 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 18:48:01,340 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 405.8ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:48:01,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 18:48:01,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 18:48:01,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 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 18:48:01,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-05-02 18:48:01,343 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2021-05-02 18:48:01,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:01,343 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-05-02 18:48:01,344 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 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 18:48:01,344 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-05-02 18:48:01,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 18:48:01,344 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:01,344 INFO L523 BasicCegarLoop]: trace histogram [12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:01,548 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:01,549 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:01,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:01,549 INFO L82 PathProgramCache]: Analyzing trace with hash -1094295764, now seen corresponding path program 8 times [2021-05-02 18:48:01,550 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:01,550 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871015573] [2021-05-02 18:48:01,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:01,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:01,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:01,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:01,730 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 33 proven. 110 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:48:01,730 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:01,730 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871015573] [2021-05-02 18:48:01,730 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871015573] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:01,730 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1672897521] [2021-05-02 18:48:01,731 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:01,774 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:48:01,775 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:01,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 18:48:01,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:01,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:01,909 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:48:01,909 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1672897521] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:01,910 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:01,910 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 17 [2021-05-02 18:48:01,910 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015110598] [2021-05-02 18:48:01,910 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 18:48:01,910 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:01,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 18:48:01,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2021-05-02 18:48:01,911 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 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 18:48:02,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:02,410 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2021-05-02 18:48:02,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 18:48:02,410 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 18:48:02,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:02,411 INFO L225 Difference]: With dead ends: 38 [2021-05-02 18:48:02,411 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 18:48:02,411 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 478.2ms TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:48:02,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 18:48:02,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 18:48:02,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 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 18:48:02,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2021-05-02 18:48:02,414 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2021-05-02 18:48:02,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:02,415 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2021-05-02 18:48:02,415 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 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 18:48:02,415 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2021-05-02 18:48:02,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 18:48:02,415 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:02,415 INFO L523 BasicCegarLoop]: trace histogram [13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:02,616 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 18:48:02,616 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:02,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:02,617 INFO L82 PathProgramCache]: Analyzing trace with hash 1784312042, now seen corresponding path program 9 times [2021-05-02 18:48:02,617 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:02,617 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654703169] [2021-05-02 18:48:02,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:02,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:02,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:02,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:02,815 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 132 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:48:02,815 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:02,815 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654703169] [2021-05-02 18:48:02,815 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654703169] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:02,815 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [598003266] [2021-05-02 18:48:02,816 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:02,897 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 18:48:02,897 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:02,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 18:48:02,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:02,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:02,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:02,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:02,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:03,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:03,139 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 55 proven. 4 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-05-02 18:48:03,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [598003266] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:03,139 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:03,139 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 5] total 18 [2021-05-02 18:48:03,139 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939291841] [2021-05-02 18:48:03,140 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 18:48:03,141 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:03,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 18:48:03,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:48:03,142 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 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 18:48:03,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:03,990 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2021-05-02 18:48:03,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 18:48:03,990 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 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 37 [2021-05-02 18:48:03,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:03,991 INFO L225 Difference]: With dead ends: 43 [2021-05-02 18:48:03,991 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 18:48:03,993 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 775.4ms TimeCoverageRelationStatistics Valid=157, Invalid=899, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 18:48:03,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 18:48:03,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-02 18:48:03,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 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 18:48:03,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-05-02 18:48:03,996 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 37 [2021-05-02 18:48:03,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:03,997 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-05-02 18:48:03,997 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 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 18:48:03,997 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-05-02 18:48:03,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 18:48:03,998 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:03,998 INFO L523 BasicCegarLoop]: trace histogram [15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:04,200 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 18:48:04,202 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:04,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:04,202 INFO L82 PathProgramCache]: Analyzing trace with hash 823361285, now seen corresponding path program 10 times [2021-05-02 18:48:04,202 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:04,202 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472347083] [2021-05-02 18:48:04,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:04,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:04,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:04,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:04,421 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:48:04,421 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:04,421 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472347083] [2021-05-02 18:48:04,421 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472347083] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:04,421 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1542335499] [2021-05-02 18:48:04,421 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:04,480 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:48:04,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:04,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 18:48:04,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:04,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:04,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:04,613 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:48:04,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1542335499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:04,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:04,614 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 18:48:04,614 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652164215] [2021-05-02 18:48:04,615 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 18:48:04,615 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:04,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 18:48:04,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 18:48:04,616 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 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 18:48:05,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:05,229 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2021-05-02 18:48:05,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 18:48:05,229 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 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 41 [2021-05-02 18:48:05,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:05,230 INFO L225 Difference]: With dead ends: 45 [2021-05-02 18:48:05,230 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 18:48:05,231 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 557.1ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:48:05,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 18:48:05,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-02 18:48:05,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 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 18:48:05,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-05-02 18:48:05,234 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 41 [2021-05-02 18:48:05,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:05,234 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-05-02 18:48:05,234 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 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 18:48:05,234 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-05-02 18:48:05,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 18:48:05,235 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:05,235 INFO L523 BasicCegarLoop]: trace histogram [16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:05,441 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 18:48:05,442 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:05,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:05,442 INFO L82 PathProgramCache]: Analyzing trace with hash 1786169923, now seen corresponding path program 11 times [2021-05-02 18:48:05,442 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:05,443 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672414136] [2021-05-02 18:48:05,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:05,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:05,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:05,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:05,710 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:48:05,710 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:05,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672414136] [2021-05-02 18:48:05,711 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [672414136] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:05,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2136241659] [2021-05-02 18:48:05,711 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:06,266 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-02 18:48:06,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:06,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 18:48:06,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:06,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:06,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:06,567 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:48:06,567 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2136241659] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:06,568 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:06,568 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 18:48:06,568 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174853915] [2021-05-02 18:48:06,568 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 18:48:06,568 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:06,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 18:48:06,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:48:06,569 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 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 18:48:07,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:07,253 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2021-05-02 18:48:07,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 18:48:07,254 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 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 43 [2021-05-02 18:48:07,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:07,255 INFO L225 Difference]: With dead ends: 47 [2021-05-02 18:48:07,255 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 18:48:07,255 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 32 SyntacticMatches, 13 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 796.4ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:48:07,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 18:48:07,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-05-02 18:48:07,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 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 18:48:07,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2021-05-02 18:48:07,264 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 43 [2021-05-02 18:48:07,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:07,265 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2021-05-02 18:48:07,266 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 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 18:48:07,266 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2021-05-02 18:48:07,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 18:48:07,268 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:07,268 INFO L523 BasicCegarLoop]: trace histogram [17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:07,473 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:07,473 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:07,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:07,473 INFO L82 PathProgramCache]: Analyzing trace with hash -667664895, now seen corresponding path program 12 times [2021-05-02 18:48:07,474 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:07,474 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737531067] [2021-05-02 18:48:07,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:07,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:07,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:07,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:07,772 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 75 proven. 210 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:48:07,772 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:07,772 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737531067] [2021-05-02 18:48:07,772 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [737531067] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:07,772 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1535832816] [2021-05-02 18:48:07,772 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:07,976 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2021-05-02 18:48:07,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:07,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 18:48:07,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:08,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:08,186 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 98 proven. 9 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-05-02 18:48:08,187 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1535832816] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:08,187 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:08,187 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 6] total 22 [2021-05-02 18:48:08,187 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229015576] [2021-05-02 18:48:08,187 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 18:48:08,187 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:08,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 18:48:08,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=374, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:48:08,188 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 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 18:48:09,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:09,378 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2021-05-02 18:48:09,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 18:48:09,379 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 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 45 [2021-05-02 18:48:09,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:09,379 INFO L225 Difference]: With dead ends: 53 [2021-05-02 18:48:09,379 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 18:48:09,380 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 1158.6ms TimeCoverageRelationStatistics Valid=260, Invalid=1462, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:48:09,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 18:48:09,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2021-05-02 18:48:09,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 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 18:48:09,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2021-05-02 18:48:09,383 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 45 [2021-05-02 18:48:09,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:09,383 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2021-05-02 18:48:09,384 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 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 18:48:09,384 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2021-05-02 18:48:09,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 18:48:09,384 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:09,384 INFO L523 BasicCegarLoop]: trace histogram [19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:09,588 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 18:48:09,589 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:09,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:09,589 INFO L82 PathProgramCache]: Analyzing trace with hash 2052506716, now seen corresponding path program 13 times [2021-05-02 18:48:09,589 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:09,589 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1841506468] [2021-05-02 18:48:09,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:09,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:09,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:09,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:09,850 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:48:09,850 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:09,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1841506468] [2021-05-02 18:48:09,850 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1841506468] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:09,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [450419314] [2021-05-02 18:48:09,850 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:09,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:09,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 18:48:09,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:10,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:10,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:10,064 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:48:10,064 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [450419314] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:10,064 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:10,065 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 18:48:10,065 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91904311] [2021-05-02 18:48:10,065 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 18:48:10,065 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:10,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 18:48:10,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:48:10,066 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 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 18:48:10,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:10,905 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2021-05-02 18:48:10,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 18:48:10,906 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 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 49 [2021-05-02 18:48:10,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:10,906 INFO L225 Difference]: With dead ends: 53 [2021-05-02 18:48:10,906 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 18:48:10,907 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 720.1ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:48:10,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 18:48:10,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-02 18:48:10,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 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 18:48:10,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2021-05-02 18:48:10,910 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2021-05-02 18:48:10,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:10,910 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2021-05-02 18:48:10,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 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 18:48:10,910 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2021-05-02 18:48:10,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 18:48:10,911 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:10,911 INFO L523 BasicCegarLoop]: trace histogram [20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:11,117 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 18:48:11,117 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:11,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:11,117 INFO L82 PathProgramCache]: Analyzing trace with hash -1781403238, now seen corresponding path program 14 times [2021-05-02 18:48:11,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:11,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [519169295] [2021-05-02 18:48:11,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:11,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:11,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:11,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:11,425 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 119 proven. 272 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:48:11,425 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:11,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [519169295] [2021-05-02 18:48:11,426 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [519169295] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:11,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [330470213] [2021-05-02 18:48:11,426 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:11,465 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:48:11,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:11,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 18:48:11,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:11,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:11,726 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:48:11,726 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [330470213] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:11,726 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:11,726 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 23] total 25 [2021-05-02 18:48:11,727 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414278710] [2021-05-02 18:48:11,728 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 18:48:11,728 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:11,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 18:48:11,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=536, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:48:11,729 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 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 18:48:12,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:12,678 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2021-05-02 18:48:12,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 18:48:12,678 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 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 51 [2021-05-02 18:48:12,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:12,679 INFO L225 Difference]: With dead ends: 55 [2021-05-02 18:48:12,679 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 18:48:12,680 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 879.6ms TimeCoverageRelationStatistics Valid=149, Invalid=1573, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:48:12,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 18:48:12,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 18:48:12,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.06) internal successors, (53), 50 states have internal predecessors, (53), 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 18:48:12,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-05-02 18:48:12,690 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 51 [2021-05-02 18:48:12,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:12,690 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-05-02 18:48:12,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 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 18:48:12,692 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-05-02 18:48:12,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 18:48:12,693 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:12,693 INFO L523 BasicCegarLoop]: trace histogram [21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:12,918 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:12,919 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:12,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:12,919 INFO L82 PathProgramCache]: Analyzing trace with hash -1086929064, now seen corresponding path program 15 times [2021-05-02 18:48:12,919 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:12,920 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [788674573] [2021-05-02 18:48:12,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:12,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:13,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:13,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:13,244 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 126 proven. 306 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:48:13,244 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:13,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [788674573] [2021-05-02 18:48:13,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [788674573] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:13,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [40517980] [2021-05-02 18:48:13,245 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:13,357 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 18:48:13,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:13,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 18:48:13,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:13,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:13,872 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 153 proven. 16 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2021-05-02 18:48:13,873 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [40517980] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:13,873 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:13,873 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 7] total 26 [2021-05-02 18:48:13,873 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142743703] [2021-05-02 18:48:13,873 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 18:48:13,873 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:13,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 18:48:13,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:48:13,874 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:15,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:15,215 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2021-05-02 18:48:15,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 18:48:15,215 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 18:48:15,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:15,216 INFO L225 Difference]: With dead ends: 59 [2021-05-02 18:48:15,216 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 18:48:15,217 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 51 SyntacticMatches, 4 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 1395.9ms TimeCoverageRelationStatistics Valid=241, Invalid=2111, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 18:48:15,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 18:48:15,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-05-02 18:48:15,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 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 18:48:15,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2021-05-02 18:48:15,220 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 53 [2021-05-02 18:48:15,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:15,220 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2021-05-02 18:48:15,220 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:15,220 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2021-05-02 18:48:15,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 18:48:15,221 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:15,221 INFO L523 BasicCegarLoop]: trace histogram [23, 18, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:15,425 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:15,425 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:15,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:15,425 INFO L82 PathProgramCache]: Analyzing trace with hash -1610435085, now seen corresponding path program 16 times [2021-05-02 18:48:15,425 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:15,426 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975544586] [2021-05-02 18:48:15,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:15,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:15,744 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:15,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:15,748 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:48:15,749 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:15,749 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975544586] [2021-05-02 18:48:15,749 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [975544586] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:15,749 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96279413] [2021-05-02 18:48:15,749 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:15,806 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:48:15,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:15,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 18:48:15,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:15,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:15,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:15,964 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:48:15,964 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96279413] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:15,965 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:15,965 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 18:48:15,965 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119298059] [2021-05-02 18:48:15,965 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 18:48:15,965 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:15,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 18:48:15,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 18:48:15,966 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 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 18:48:16,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:16,852 INFO L93 Difference]: Finished difference Result 61 states and 63 transitions. [2021-05-02 18:48:16,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 18:48:16,853 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 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 57 [2021-05-02 18:48:16,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:16,853 INFO L225 Difference]: With dead ends: 61 [2021-05-02 18:48:16,853 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 18:48:16,854 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 824.3ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:48:16,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 18:48:16,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-05-02 18:48:16,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 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 18:48:16,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-05-02 18:48:16,856 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 57 [2021-05-02 18:48:16,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:16,856 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-05-02 18:48:16,856 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 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 18:48:16,856 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-05-02 18:48:16,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 18:48:16,856 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:16,857 INFO L523 BasicCegarLoop]: trace histogram [24, 19, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:17,057 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:17,057 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:17,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:17,058 INFO L82 PathProgramCache]: Analyzing trace with hash 9684273, now seen corresponding path program 17 times [2021-05-02 18:48:17,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:17,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546942543] [2021-05-02 18:48:17,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:17,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:17,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:17,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:17,408 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 180 proven. 380 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:48:17,408 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:17,408 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546942543] [2021-05-02 18:48:17,409 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546942543] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:17,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [754831304] [2021-05-02 18:48:17,409 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:18,786 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-02 18:48:18,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:18,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-02 18:48:18,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:18,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:18,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:18,997 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 69 proven. 506 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:48:18,997 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [754831304] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:18,997 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:18,997 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 25] total 27 [2021-05-02 18:48:18,997 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354491142] [2021-05-02 18:48:18,998 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 18:48:18,998 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:18,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 18:48:18,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=631, Unknown=0, NotChecked=0, Total=702 [2021-05-02 18:48:18,998 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 27 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:20,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:20,044 INFO L93 Difference]: Finished difference Result 63 states and 65 transitions. [2021-05-02 18:48:20,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 18:48:20,045 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 18:48:20,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:20,045 INFO L225 Difference]: With dead ends: 63 [2021-05-02 18:48:20,045 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 18:48:20,046 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 995.4ms TimeCoverageRelationStatistics Valid=171, Invalid=1991, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 18:48:20,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 18:48:20,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-05-02 18:48:20,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:20,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2021-05-02 18:48:20,048 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 59 [2021-05-02 18:48:20,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:20,049 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2021-05-02 18:48:20,049 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:20,049 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2021-05-02 18:48:20,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 18:48:20,049 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:20,049 INFO L523 BasicCegarLoop]: trace histogram [25, 20, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:20,254 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 18:48:20,254 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:20,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:20,255 INFO L82 PathProgramCache]: Analyzing trace with hash -2128741137, now seen corresponding path program 18 times [2021-05-02 18:48:20,255 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:20,255 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1229540993] [2021-05-02 18:48:20,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:20,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:20,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:20,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:20,680 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 189 proven. 420 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:48:20,681 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:20,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1229540993] [2021-05-02 18:48:20,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1229540993] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:20,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1050781892] [2021-05-02 18:48:20,681 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:21,037 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 23 check-sat command(s) [2021-05-02 18:48:21,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:21,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 18:48:21,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:21,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:21,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:21,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:21,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:21,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:21,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:21,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:21,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:21,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:21,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:21,861 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 260 proven. 123 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-05-02 18:48:21,862 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1050781892] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:21,862 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:21,862 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 11] total 33 [2021-05-02 18:48:21,862 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206422756] [2021-05-02 18:48:21,863 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 18:48:21,864 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:21,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 18:48:21,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=878, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 18:48:21,865 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 33 states, 33 states have (on average 2.242424242424242) internal successors, (74), 32 states have internal predecessors, (74), 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 18:48:23,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:23,966 INFO L93 Difference]: Finished difference Result 73 states and 78 transitions. [2021-05-02 18:48:23,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 18:48:23,966 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.242424242424242) internal successors, (74), 32 states have internal predecessors, (74), 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 61 [2021-05-02 18:48:23,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:23,971 INFO L225 Difference]: With dead ends: 73 [2021-05-02 18:48:23,972 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 18:48:23,973 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 56 SyntacticMatches, 4 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 2436.1ms TimeCoverageRelationStatistics Valid=519, Invalid=3387, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 18:48:23,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 18:48:23,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 67. [2021-05-02 18:48:23,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 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 18:48:23,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2021-05-02 18:48:23,976 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 61 [2021-05-02 18:48:23,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:23,976 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2021-05-02 18:48:23,976 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.242424242424242) internal successors, (74), 32 states have internal predecessors, (74), 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 18:48:23,976 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2021-05-02 18:48:23,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 18:48:23,977 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:23,977 INFO L523 BasicCegarLoop]: trace histogram [27, 21, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:24,177 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 18:48:24,177 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:24,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:24,178 INFO L82 PathProgramCache]: Analyzing trace with hash 647447498, now seen corresponding path program 19 times [2021-05-02 18:48:24,178 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:24,178 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368227244] [2021-05-02 18:48:24,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:24,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:24,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:24,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:24,559 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 18:48:24,560 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:24,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368227244] [2021-05-02 18:48:24,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1368227244] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:24,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2000786529] [2021-05-02 18:48:24,560 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:24,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:24,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 18:48:24,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:24,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:24,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:24,797 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 18:48:24,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2000786529] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:24,797 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:24,797 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 18:48:24,798 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625406830] [2021-05-02 18:48:24,798 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 18:48:24,798 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:24,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 18:48:24,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:48:24,799 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 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 18:48:25,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:25,957 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2021-05-02 18:48:25,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 18:48:25,958 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-02 18:48:25,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:25,958 INFO L225 Difference]: With dead ends: 69 [2021-05-02 18:48:25,959 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 18:48:25,959 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 1040.6ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 18:48:25,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 18:48:25,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-05-02 18:48:25,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 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 18:48:25,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2021-05-02 18:48:25,962 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 65 [2021-05-02 18:48:25,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:25,962 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2021-05-02 18:48:25,962 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 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 18:48:25,962 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2021-05-02 18:48:25,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 18:48:25,963 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:25,963 INFO L523 BasicCegarLoop]: trace histogram [28, 22, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:26,176 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:26,177 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:26,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:26,177 INFO L82 PathProgramCache]: Analyzing trace with hash 1362900232, now seen corresponding path program 20 times [2021-05-02 18:48:26,177 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:26,177 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215151986] [2021-05-02 18:48:26,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:26,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:26,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:26,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:26,628 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 253 proven. 506 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 18:48:26,629 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:26,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215151986] [2021-05-02 18:48:26,629 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1215151986] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:26,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964823137] [2021-05-02 18:48:26,629 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:26,690 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:48:26,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:26,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 18:48:26,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:26,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:26,984 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:48:26,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [964823137] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:26,984 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:26,984 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 31] total 33 [2021-05-02 18:48:26,985 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381070815] [2021-05-02 18:48:26,985 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 18:48:26,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:26,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 18:48:26,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=970, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 18:48:26,986 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 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 18:48:28,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:28,319 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2021-05-02 18:48:28,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 18:48:28,319 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 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 67 [2021-05-02 18:48:28,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:28,320 INFO L225 Difference]: With dead ends: 71 [2021-05-02 18:48:28,320 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 18:48:28,321 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1311.1ms TimeCoverageRelationStatistics Valid=201, Invalid=2879, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:48:28,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 18:48:28,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-02 18:48:28,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 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 18:48:28,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2021-05-02 18:48:28,323 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 67 [2021-05-02 18:48:28,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:28,323 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2021-05-02 18:48:28,323 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 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 18:48:28,323 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2021-05-02 18:48:28,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 18:48:28,324 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:28,324 INFO L523 BasicCegarLoop]: trace histogram [29, 23, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:28,533 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 18:48:28,533 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:28,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:28,533 INFO L82 PathProgramCache]: Analyzing trace with hash 1718210246, now seen corresponding path program 21 times [2021-05-02 18:48:28,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:28,533 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942677169] [2021-05-02 18:48:28,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:28,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:28,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:29,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:29,021 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 264 proven. 552 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 18:48:29,021 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:29,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942677169] [2021-05-02 18:48:29,022 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [942677169] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:29,022 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [190028336] [2021-05-02 18:48:29,022 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:29,149 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-02 18:48:29,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:29,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 18:48:29,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:30,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:30,095 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 299 proven. 36 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2021-05-02 18:48:30,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [190028336] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:30,096 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:30,096 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 9] total 34 [2021-05-02 18:48:30,096 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967952379] [2021-05-02 18:48:30,096 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 18:48:30,097 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:30,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 18:48:30,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=992, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 18:48:30,098 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 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 18:48:32,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:32,599 INFO L93 Difference]: Finished difference Result 77 states and 80 transitions. [2021-05-02 18:48:32,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:48:32,600 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 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 69 [2021-05-02 18:48:32,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:32,600 INFO L225 Difference]: With dead ends: 77 [2021-05-02 18:48:32,600 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 18:48:32,601 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 66 SyntacticMatches, 5 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 529 ImplicationChecksByTransitivity, 2859.9ms TimeCoverageRelationStatistics Valid=397, Invalid=3893, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:48:32,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 18:48:32,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2021-05-02 18:48:32,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 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 18:48:32,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2021-05-02 18:48:32,603 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 69 [2021-05-02 18:48:32,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:32,603 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2021-05-02 18:48:32,604 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 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 18:48:32,604 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2021-05-02 18:48:32,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 18:48:32,604 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:32,604 INFO L523 BasicCegarLoop]: trace histogram [31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:32,809 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:32,809 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:32,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:32,809 INFO L82 PathProgramCache]: Analyzing trace with hash -665297439, now seen corresponding path program 22 times [2021-05-02 18:48:32,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:32,810 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419615143] [2021-05-02 18:48:32,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:32,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:33,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:33,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:33,363 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:48:33,363 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:33,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419615143] [2021-05-02 18:48:33,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [419615143] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:33,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1698112937] [2021-05-02 18:48:33,364 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:33,421 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:48:33,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:33,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-02 18:48:33,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:33,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:33,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:33,611 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:48:33,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1698112937] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:33,612 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:33,612 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 18:48:33,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411748970] [2021-05-02 18:48:33,615 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 18:48:33,615 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:33,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 18:48:33,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 18:48:33,616 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 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 18:48:35,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:35,092 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2021-05-02 18:48:35,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 18:48:35,092 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 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 73 [2021-05-02 18:48:35,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:35,093 INFO L225 Difference]: With dead ends: 77 [2021-05-02 18:48:35,093 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 18:48:35,094 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 1367.7ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 18:48:35,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 18:48:35,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-05-02 18:48:35,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 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 18:48:35,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2021-05-02 18:48:35,096 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 73 [2021-05-02 18:48:35,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:35,097 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2021-05-02 18:48:35,097 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 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 18:48:35,097 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2021-05-02 18:48:35,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 18:48:35,097 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:35,098 INFO L523 BasicCegarLoop]: trace histogram [32, 25, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:35,312 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 18:48:35,313 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:35,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:35,313 INFO L82 PathProgramCache]: Analyzing trace with hash 1947152671, now seen corresponding path program 23 times [2021-05-02 18:48:35,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:35,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905214328] [2021-05-02 18:48:35,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:35,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:35,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:35,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:35,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:48:35,907 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:35,907 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905214328] [2021-05-02 18:48:35,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [905214328] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:35,907 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1156824471] [2021-05-02 18:48:35,907 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:40,055 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 33 check-sat command(s) [2021-05-02 18:48:40,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:40,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 18:48:40,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:40,643 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:48:40,643 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1156824471] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:40,643 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:40,643 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 18:48:40,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164780285] [2021-05-02 18:48:40,643 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 18:48:40,643 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:40,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 18:48:40,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:48:40,644 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 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 18:48:42,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:42,018 INFO L93 Difference]: Finished difference Result 79 states and 81 transitions. [2021-05-02 18:48:42,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 18:48:42,018 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 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 75 [2021-05-02 18:48:42,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:42,019 INFO L225 Difference]: With dead ends: 79 [2021-05-02 18:48:42,019 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 18:48:42,020 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 52 SyntacticMatches, 25 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 1773.4ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:48:42,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 18:48:42,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-05-02 18:48:42,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 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 18:48:42,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2021-05-02 18:48:42,022 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 75 [2021-05-02 18:48:42,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:42,022 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2021-05-02 18:48:42,023 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 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 18:48:42,023 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2021-05-02 18:48:42,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 18:48:42,023 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:42,023 INFO L523 BasicCegarLoop]: trace histogram [33, 26, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:42,229 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 18:48:42,229 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:42,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:42,229 INFO L82 PathProgramCache]: Analyzing trace with hash -44159779, now seen corresponding path program 24 times [2021-05-02 18:48:42,230 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:42,230 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1936684958] [2021-05-02 18:48:42,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:42,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:42,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:42,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:42,869 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 351 proven. 702 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:48:42,869 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:42,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1936684958] [2021-05-02 18:48:42,870 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1936684958] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:42,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651360537] [2021-05-02 18:48:42,870 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:44,269 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 18:48:44,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:44,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 18:48:44,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:44,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:44,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:44,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:44,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:45,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:45,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:45,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:45,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:46,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:46,244 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 606 proven. 299 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-05-02 18:48:46,244 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651360537] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:46,244 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:46,244 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 21] total 49 [2021-05-02 18:48:46,244 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391678817] [2021-05-02 18:48:46,245 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 18:48:46,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:46,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 18:48:46,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=483, Invalid=1869, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 18:48:46,245 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 49 states, 49 states have (on average 2.163265306122449) internal successors, (106), 48 states have internal predecessors, (106), 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 18:48:48,907 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:48:51,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:51,003 INFO L93 Difference]: Finished difference Result 105 states and 118 transitions. [2021-05-02 18:48:51,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 18:48:51,003 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.163265306122449) internal successors, (106), 48 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-02 18:48:51,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:51,004 INFO L225 Difference]: With dead ends: 105 [2021-05-02 18:48:51,004 INFO L226 Difference]: Without dead ends: 105 [2021-05-02 18:48:51,006 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 61 SyntacticMatches, 7 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1585 ImplicationChecksByTransitivity, 5938.0ms TimeCoverageRelationStatistics Valid=1409, Invalid=7521, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 18:48:51,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-02 18:48:51,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 83. [2021-05-02 18:48:51,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 78 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 18:48:51,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2021-05-02 18:48:51,008 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 77 [2021-05-02 18:48:51,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:51,009 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2021-05-02 18:48:51,009 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.163265306122449) internal successors, (106), 48 states have internal predecessors, (106), 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 18:48:51,009 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2021-05-02 18:48:51,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 18:48:51,009 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:51,009 INFO L523 BasicCegarLoop]: trace histogram [35, 27, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:51,214 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 18:48:51,214 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:51,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:51,215 INFO L82 PathProgramCache]: Analyzing trace with hash 1682830392, now seen corresponding path program 25 times [2021-05-02 18:48:51,215 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:51,215 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417192628] [2021-05-02 18:48:51,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:51,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:51,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:51,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:51,806 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:48:51,807 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:51,807 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417192628] [2021-05-02 18:48:51,807 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [417192628] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:51,807 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1316251872] [2021-05-02 18:48:51,807 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:51,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:51,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 18:48:51,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:52,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:52,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:52,076 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:48:52,077 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1316251872] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:52,077 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:52,077 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 18:48:52,079 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137932] [2021-05-02 18:48:52,079 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 18:48:52,079 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:52,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 18:48:52,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:48:52,080 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 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 18:48:53,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:53,863 INFO L93 Difference]: Finished difference Result 85 states and 87 transitions. [2021-05-02 18:48:53,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 18:48:53,864 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 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 81 [2021-05-02 18:48:53,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:53,864 INFO L225 Difference]: With dead ends: 85 [2021-05-02 18:48:53,864 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 18:48:53,865 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 1544.3ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 18:48:53,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 18:48:53,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-05-02 18:48:53,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 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 18:48:53,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-05-02 18:48:53,868 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 81 [2021-05-02 18:48:53,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:53,868 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-05-02 18:48:53,868 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 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 18:48:53,868 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-05-02 18:48:53,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 18:48:53,869 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:53,869 INFO L523 BasicCegarLoop]: trace histogram [36, 28, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:54,076 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:54,077 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:54,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:54,077 INFO L82 PathProgramCache]: Analyzing trace with hash 974432630, now seen corresponding path program 26 times [2021-05-02 18:48:54,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:54,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029822652] [2021-05-02 18:48:54,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:54,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:54,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:54,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:54,758 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:48:54,758 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:54,758 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2029822652] [2021-05-02 18:48:54,758 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2029822652] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:54,758 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066200067] [2021-05-02 18:48:54,758 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:54,823 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:48:54,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:54,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 75 conjunts are in the unsatisfiable core [2021-05-02 18:48:54,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:55,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:55,339 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:48:55,340 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2066200067] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:55,340 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:55,340 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 39] total 41 [2021-05-02 18:48:55,340 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166483049] [2021-05-02 18:48:55,340 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 18:48:55,340 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:55,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 18:48:55,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1532, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 18:48:55,341 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 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 18:48:57,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:48:57,449 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2021-05-02 18:48:57,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 18:48:57,450 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 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 18:48:57,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:48:57,451 INFO L225 Difference]: With dead ends: 87 [2021-05-02 18:48:57,451 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 18:48:57,452 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 2063.8ms TimeCoverageRelationStatistics Valid=253, Invalid=4577, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 18:48:57,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 18:48:57,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-05-02 18:48:57,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:48:57,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2021-05-02 18:48:57,454 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2021-05-02 18:48:57,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:48:57,455 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2021-05-02 18:48:57,455 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 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 18:48:57,455 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2021-05-02 18:48:57,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 18:48:57,455 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:48:57,455 INFO L523 BasicCegarLoop]: trace histogram [37, 29, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:48:57,656 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 18:48:57,656 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:48:57,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:48:57,656 INFO L82 PathProgramCache]: Analyzing trace with hash -1190983884, now seen corresponding path program 27 times [2021-05-02 18:48:57,657 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:48:57,657 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720771124] [2021-05-02 18:48:57,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:48:57,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:58,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:48:58,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:48:58,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 450 proven. 870 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:48:58,358 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:48:58,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720771124] [2021-05-02 18:48:58,358 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [720771124] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:58,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1304334661] [2021-05-02 18:48:58,359 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:48:58,517 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-05-02 18:48:58,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:48:58,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 18:48:58,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:48:59,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:48:59,086 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 493 proven. 64 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2021-05-02 18:48:59,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1304334661] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:48:59,086 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:48:59,086 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 11] total 42 [2021-05-02 18:48:59,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52106006] [2021-05-02 18:48:59,087 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 18:48:59,087 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:48:59,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 18:48:59,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=1458, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:48:59,087 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 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 18:49:01,593 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:49:02,934 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:49:03,670 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:49:04,108 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:49:05,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:05,397 INFO L93 Difference]: Finished difference Result 93 states and 96 transitions. [2021-05-02 18:49:05,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 18:49:05,397 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 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 85 [2021-05-02 18:49:05,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:05,398 INFO L225 Difference]: With dead ends: 93 [2021-05-02 18:49:05,398 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 18:49:05,399 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 832 ImplicationChecksByTransitivity, 6270.7ms TimeCoverageRelationStatistics Valid=731, Invalid=5911, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 18:49:05,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 18:49:05,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2021-05-02 18:49:05,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 86 states have internal predecessors, (89), 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 18:49:05,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2021-05-02 18:49:05,401 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 85 [2021-05-02 18:49:05,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:05,401 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2021-05-02 18:49:05,402 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 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 18:49:05,402 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2021-05-02 18:49:05,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 18:49:05,402 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:05,402 INFO L523 BasicCegarLoop]: trace histogram [39, 30, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:05,607 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:49:05,607 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:05,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:05,608 INFO L82 PathProgramCache]: Analyzing trace with hash 1027864271, now seen corresponding path program 28 times [2021-05-02 18:49:05,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:05,608 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327626756] [2021-05-02 18:49:05,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:05,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:06,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:06,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:06,298 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:49:06,298 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:06,298 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1327626756] [2021-05-02 18:49:06,298 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1327626756] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:06,298 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [436472653] [2021-05-02 18:49:06,298 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:49:06,347 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:49:06,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:06,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 18:49:06,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:06,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:06,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:06,587 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:49:06,587 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [436472653] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:06,587 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:06,588 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 18:49:06,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536798636] [2021-05-02 18:49:06,589 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 18:49:06,589 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:06,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 18:49:06,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 18:49:06,590 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 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 18:49:08,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:08,695 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2021-05-02 18:49:08,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 18:49:08,695 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-02 18:49:08,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:08,696 INFO L225 Difference]: With dead ends: 93 [2021-05-02 18:49:08,696 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 18:49:08,696 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 470 ImplicationChecksByTransitivity, 1850.6ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:49:08,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 18:49:08,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-05-02 18:49:08,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 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 18:49:08,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2021-05-02 18:49:08,699 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 89 [2021-05-02 18:49:08,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:08,699 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2021-05-02 18:49:08,699 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 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 18:49:08,699 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2021-05-02 18:49:08,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-02 18:49:08,700 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:08,700 INFO L523 BasicCegarLoop]: trace histogram [40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:08,908 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 18:49:08,909 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:08,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:08,909 INFO L82 PathProgramCache]: Analyzing trace with hash 941133325, now seen corresponding path program 29 times [2021-05-02 18:49:08,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:08,909 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233529097] [2021-05-02 18:49:08,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:08,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:09,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:09,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:09,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 544 proven. 992 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:49:09,642 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:09,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233529097] [2021-05-02 18:49:09,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233529097] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:09,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122217626] [2021-05-02 18:49:09,642 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:49:17,557 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 41 check-sat command(s) [2021-05-02 18:49:17,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:17,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 18:49:17,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:18,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:18,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:18,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 442 proven. 1122 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:49:18,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1122217626] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:18,477 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:18,477 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 36] total 38 [2021-05-02 18:49:18,477 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247273930] [2021-05-02 18:49:18,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 18:49:18,478 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:18,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 18:49:18,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1301, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 18:49:18,479 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 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 18:49:20,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:20,986 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2021-05-02 18:49:20,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:49:20,986 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 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 91 [2021-05-02 18:49:20,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:20,987 INFO L225 Difference]: With dead ends: 95 [2021-05-02 18:49:20,987 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 18:49:20,988 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 70 SyntacticMatches, 21 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 2685.5ms TimeCoverageRelationStatistics Valid=265, Invalid=4565, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 18:49:20,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 18:49:20,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-05-02 18:49:20,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.0333333333333334) internal successors, (93), 90 states have internal predecessors, (93), 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 18:49:20,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2021-05-02 18:49:20,990 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 91 [2021-05-02 18:49:20,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:20,990 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2021-05-02 18:49:20,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 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 18:49:20,991 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2021-05-02 18:49:20,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 18:49:20,991 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:20,991 INFO L523 BasicCegarLoop]: trace histogram [41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:21,197 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 18:49:21,197 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:21,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:21,197 INFO L82 PathProgramCache]: Analyzing trace with hash -802927157, now seen corresponding path program 30 times [2021-05-02 18:49:21,198 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:21,198 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662100678] [2021-05-02 18:49:21,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:21,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:22,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:22,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:22,062 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:49:22,063 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:22,063 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662100678] [2021-05-02 18:49:22,063 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1662100678] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:22,063 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1492553620] [2021-05-02 18:49:22,063 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 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 18:49:26,725 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 39 check-sat command(s) [2021-05-02 18:49:26,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:26,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 104 conjunts are in the unsatisfiable core [2021-05-02 18:49:26,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:26,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:26,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:28,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:28,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:30,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:30,757 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 753 proven. 816 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-02 18:49:30,758 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1492553620] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:30,758 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:30,758 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 32] total 62 [2021-05-02 18:49:30,758 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92719435] [2021-05-02 18:49:30,758 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-02 18:49:30,758 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:30,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-02 18:49:30,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=680, Invalid=3102, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 18:49:30,759 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 62 states, 62 states have (on average 2.129032258064516) internal successors, (132), 61 states have internal predecessors, (132), 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 18:49:37,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:37,080 INFO L93 Difference]: Finished difference Result 131 states and 149 transitions. [2021-05-02 18:49:37,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-02 18:49:37,080 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.129032258064516) internal successors, (132), 61 states have internal predecessors, (132), 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 93 [2021-05-02 18:49:37,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:37,081 INFO L225 Difference]: With dead ends: 131 [2021-05-02 18:49:37,081 INFO L226 Difference]: Without dead ends: 131 [2021-05-02 18:49:37,082 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 68 SyntacticMatches, 12 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2771 ImplicationChecksByTransitivity, 8822.4ms TimeCoverageRelationStatistics Valid=2051, Invalid=12469, Unknown=0, NotChecked=0, Total=14520 [2021-05-02 18:49:37,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-02 18:49:37,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 99. [2021-05-02 18:49:37,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 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 18:49:37,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2021-05-02 18:49:37,085 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 93 [2021-05-02 18:49:37,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:37,085 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2021-05-02 18:49:37,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 2.129032258064516) internal successors, (132), 61 states have internal predecessors, (132), 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 18:49:37,085 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2021-05-02 18:49:37,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-02 18:49:37,086 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:37,086 INFO L523 BasicCegarLoop]: trace histogram [43, 33, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:37,292 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 18:49:37,292 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:37,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:37,292 INFO L82 PathProgramCache]: Analyzing trace with hash -1194699354, now seen corresponding path program 31 times [2021-05-02 18:49:37,292 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:37,293 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203548380] [2021-05-02 18:49:37,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:37,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:38,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:38,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:38,306 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:49:38,306 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:38,306 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203548380] [2021-05-02 18:49:38,307 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1203548380] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:38,307 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [618145226] [2021-05-02 18:49:38,307 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 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 18:49:38,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:38,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 18:49:38,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:38,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:38,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:38,621 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:49:38,622 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [618145226] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:38,622 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:38,622 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 18:49:38,622 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593502828] [2021-05-02 18:49:38,622 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 18:49:38,622 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:38,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 18:49:38,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 18:49:38,623 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 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 18:49:41,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:41,237 INFO L93 Difference]: Finished difference Result 101 states and 103 transitions. [2021-05-02 18:49:41,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 18:49:41,238 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 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 97 [2021-05-02 18:49:41,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:41,238 INFO L225 Difference]: With dead ends: 101 [2021-05-02 18:49:41,239 INFO L226 Difference]: Without dead ends: 101 [2021-05-02 18:49:41,239 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 97 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 2356.3ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 18:49:41,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-02 18:49:41,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2021-05-02 18:49:41,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 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 18:49:41,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2021-05-02 18:49:41,242 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2021-05-02 18:49:41,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:41,242 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2021-05-02 18:49:41,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 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 18:49:41,243 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2021-05-02 18:49:41,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 18:49:41,243 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:41,243 INFO L523 BasicCegarLoop]: trace histogram [44, 34, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:41,456 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 18:49:41,457 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:41,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:41,457 INFO L82 PathProgramCache]: Analyzing trace with hash -441790748, now seen corresponding path program 32 times [2021-05-02 18:49:41,457 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:41,457 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366682546] [2021-05-02 18:49:41,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:41,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:42,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:42,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:42,450 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 665 proven. 1190 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:49:42,450 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:42,450 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366682546] [2021-05-02 18:49:42,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [366682546] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:42,450 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [816951367] [2021-05-02 18:49:42,450 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 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 18:49:42,509 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:49:42,509 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:42,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 18:49:42,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:43,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:43,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:49:43,115 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [816951367] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:43,115 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:43,116 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 47] total 49 [2021-05-02 18:49:43,116 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019204280] [2021-05-02 18:49:43,116 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 18:49:43,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:43,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 18:49:43,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2222, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 18:49:43,117 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 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 18:49:46,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:46,134 INFO L93 Difference]: Finished difference Result 103 states and 105 transitions. [2021-05-02 18:49:46,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 18:49:46,135 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 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 99 [2021-05-02 18:49:46,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:46,135 INFO L225 Difference]: With dead ends: 103 [2021-05-02 18:49:46,135 INFO L226 Difference]: Without dead ends: 103 [2021-05-02 18:49:46,136 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 619 ImplicationChecksByTransitivity, 2806.5ms TimeCoverageRelationStatistics Valid=305, Invalid=6667, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 18:49:46,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-02 18:49:46,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-05-02 18:49:46,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:49:46,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-02 18:49:46,138 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 99 [2021-05-02 18:49:46,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:46,138 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-02 18:49:46,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 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 18:49:46,138 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-02 18:49:46,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 18:49:46,138 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:46,139 INFO L523 BasicCegarLoop]: trace histogram [45, 35, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:46,339 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 18:49:46,339 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:46,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:46,340 INFO L82 PathProgramCache]: Analyzing trace with hash 1548873890, now seen corresponding path program 33 times [2021-05-02 18:49:46,340 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:46,340 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1571257140] [2021-05-02 18:49:46,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:46,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:47,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:47,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:47,323 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 684 proven. 1260 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:49:47,323 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:47,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1571257140] [2021-05-02 18:49:47,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1571257140] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:47,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2004374841] [2021-05-02 18:49:47,324 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 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 [2021-05-02 18:49:47,658 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-05-02 18:49:47,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:47,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 18:49:47,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:50,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:50,126 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 735 proven. 100 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2021-05-02 18:49:50,126 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2004374841] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:50,126 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:50,127 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 13] total 50 [2021-05-02 18:49:50,127 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901159669] [2021-05-02 18:49:50,127 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 18:49:50,127 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:50,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 18:49:50,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=2284, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:49:50,128 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 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 18:49:55,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:55,641 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2021-05-02 18:49:55,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 18:49:55,642 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 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 18:49:55,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:55,642 INFO L225 Difference]: With dead ends: 107 [2021-05-02 18:49:55,642 INFO L226 Difference]: Without dead ends: 107 [2021-05-02 18:49:55,643 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 95 SyntacticMatches, 8 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1118 ImplicationChecksByTransitivity, 5782.5ms TimeCoverageRelationStatistics Valid=493, Invalid=8819, Unknown=0, NotChecked=0, Total=9312 [2021-05-02 18:49:55,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-02 18:49:55,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2021-05-02 18:49:55,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0294117647058822) internal successors, (105), 102 states have internal predecessors, (105), 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 18:49:55,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2021-05-02 18:49:55,646 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 101 [2021-05-02 18:49:55,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:55,646 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2021-05-02 18:49:55,646 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 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 18:49:55,646 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2021-05-02 18:49:55,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 18:49:55,647 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:55,647 INFO L523 BasicCegarLoop]: trace histogram [47, 36, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:49:55,851 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 18:49:55,851 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:49:55,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:49:55,852 INFO L82 PathProgramCache]: Analyzing trace with hash 1848967357, now seen corresponding path program 34 times [2021-05-02 18:49:55,852 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:49:55,852 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351621006] [2021-05-02 18:49:55,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:49:55,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:56,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:49:56,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:49:56,843 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:49:56,844 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:49:56,844 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351621006] [2021-05-02 18:49:56,844 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351621006] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:56,844 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [927119522] [2021-05-02 18:49:56,844 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:49:56,898 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:49:56,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:49:56,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 76 conjunts are in the unsatisfiable core [2021-05-02 18:49:56,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:49:57,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:57,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:49:57,177 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:49:57,177 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [927119522] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:49:57,177 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:49:57,178 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 18:49:57,178 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303607626] [2021-05-02 18:49:57,178 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 18:49:57,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:49:57,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 18:49:57,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 18:49:57,179 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 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 18:49:59,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:49:59,926 INFO L93 Difference]: Finished difference Result 109 states and 111 transitions. [2021-05-02 18:49:59,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 18:49:59,927 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 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 105 [2021-05-02 18:49:59,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:49:59,927 INFO L225 Difference]: With dead ends: 109 [2021-05-02 18:49:59,927 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 18:49:59,928 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 671 ImplicationChecksByTransitivity, 2432.5ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 18:49:59,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 18:49:59,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2021-05-02 18:49:59,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 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 18:49:59,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-05-02 18:49:59,930 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 105 [2021-05-02 18:49:59,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:49:59,930 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-05-02 18:49:59,931 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 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 18:49:59,931 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-05-02 18:49:59,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 18:49:59,931 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:49:59,931 INFO L523 BasicCegarLoop]: trace histogram [48, 37, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:50:00,136 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 18:50:00,137 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:50:00,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:50:00,137 INFO L82 PathProgramCache]: Analyzing trace with hash -65053701, now seen corresponding path program 35 times [2021-05-02 18:50:00,137 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:50:00,137 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [627148420] [2021-05-02 18:50:00,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:50:00,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:50:01,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:50:01,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:50:01,070 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 798 proven. 1406 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:50:01,070 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:50:01,070 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [627148420] [2021-05-02 18:50:01,071 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [627148420] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:50:01,071 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [717243223] [2021-05-02 18:50:01,071 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:50:25,584 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 49 check-sat command(s) [2021-05-02 18:50:25,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:50:25,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 18:50:25,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:50:25,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:25,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:25,946 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 741 proven. 1482 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:50:25,947 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [717243223] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:50:25,947 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:50:25,947 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 43 [2021-05-02 18:50:25,947 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337872139] [2021-05-02 18:50:25,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 18:50:25,947 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:50:25,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 18:50:25,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1685, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 18:50:25,948 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 42 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 18:50:28,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:50:28,914 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2021-05-02 18:50:28,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 18:50:28,915 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 42 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 107 [2021-05-02 18:50:28,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:50:28,916 INFO L225 Difference]: With dead ends: 111 [2021-05-02 18:50:28,916 INFO L226 Difference]: Without dead ends: 111 [2021-05-02 18:50:28,916 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 104 SyntacticMatches, 4 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 715 ImplicationChecksByTransitivity, 2523.0ms TimeCoverageRelationStatistics Valid=311, Invalid=6169, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 18:50:28,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-05-02 18:50:28,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-05-02 18:50:28,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 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 18:50:28,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2021-05-02 18:50:28,918 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 107 [2021-05-02 18:50:28,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:50:28,918 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2021-05-02 18:50:28,918 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 42 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 18:50:28,918 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2021-05-02 18:50:28,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-02 18:50:28,919 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:50:28,919 INFO L523 BasicCegarLoop]: trace histogram [49, 38, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:50:29,120 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 18:50:29,121 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:50:29,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:50:29,121 INFO L82 PathProgramCache]: Analyzing trace with hash -1193287751, now seen corresponding path program 36 times [2021-05-02 18:50:29,121 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:50:29,121 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330274510] [2021-05-02 18:50:29,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:50:29,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:50:30,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:50:30,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:50:30,176 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 819 proven. 1482 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:50:30,177 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:50:30,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330274510] [2021-05-02 18:50:30,177 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [330274510] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:50:30,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401972283] [2021-05-02 18:50:30,177 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:50:39,253 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 47 check-sat command(s) [2021-05-02 18:50:39,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:50:39,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-02 18:50:39,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:50:39,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:39,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:39,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:39,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:41,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:41,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:41,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:41,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:41,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:41,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:41,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:43,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:43,999 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 853 proven. 1274 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-05-02 18:50:43,999 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401972283] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:50:43,999 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:50:43,999 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 34] total 67 [2021-05-02 18:50:43,999 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726476844] [2021-05-02 18:50:44,000 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-02 18:50:44,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:50:44,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-02 18:50:44,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=816, Invalid=3606, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 18:50:44,001 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 67 states, 67 states have (on average 2.1194029850746268) internal successors, (142), 66 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 18:50:49,804 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:50:50,762 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:50:51,845 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:50:53,910 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:50:55,066 WARN L205 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:50:57,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:50:57,841 INFO L93 Difference]: Finished difference Result 141 states and 156 transitions. [2021-05-02 18:50:57,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-02 18:50:57,841 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.1194029850746268) internal successors, (142), 66 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 109 [2021-05-02 18:50:57,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:50:57,842 INFO L225 Difference]: With dead ends: 141 [2021-05-02 18:50:57,842 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 18:50:57,843 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 91 SyntacticMatches, 8 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2878 ImplicationChecksByTransitivity, 16030.3ms TimeCoverageRelationStatistics Valid=2363, Invalid=14667, Unknown=0, NotChecked=0, Total=17030 [2021-05-02 18:50:57,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 18:50:57,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 115. [2021-05-02 18:50:57,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0272727272727273) internal successors, (113), 110 states have internal predecessors, (113), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:50:57,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2021-05-02 18:50:57,846 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 109 [2021-05-02 18:50:57,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:50:57,846 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2021-05-02 18:50:57,846 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 67 states, 67 states have (on average 2.1194029850746268) internal successors, (142), 66 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 18:50:57,846 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2021-05-02 18:50:57,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-02 18:50:57,847 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:50:57,847 INFO L523 BasicCegarLoop]: trace histogram [51, 39, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:50:58,054 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:50:58,054 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:50:58,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:50:58,054 INFO L82 PathProgramCache]: Analyzing trace with hash -711202796, now seen corresponding path program 37 times [2021-05-02 18:50:58,054 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:50:58,055 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1691977722] [2021-05-02 18:50:58,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:50:58,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:50:59,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:50:59,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:50:59,090 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 920 proven. 1560 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 18:50:59,090 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:50:59,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1691977722] [2021-05-02 18:50:59,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1691977722] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:50:59,091 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [253816355] [2021-05-02 18:50:59,091 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:50:59,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:50:59,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 18:50:59,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:50:59,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:59,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:50:59,470 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 920 proven. 1560 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 18:50:59,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [253816355] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:50:59,470 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:50:59,470 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 18:50:59,470 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488148797] [2021-05-02 18:50:59,470 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 18:50:59,470 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:50:59,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 18:50:59,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 18:50:59,471 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 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 18:51:02,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:02,805 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2021-05-02 18:51:02,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 18:51:02,806 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 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 18:51:02,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:02,806 INFO L225 Difference]: With dead ends: 117 [2021-05-02 18:51:02,806 INFO L226 Difference]: Without dead ends: 117 [2021-05-02 18:51:02,807 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 785 ImplicationChecksByTransitivity, 2701.6ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 18:51:02,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-02 18:51:02,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2021-05-02 18:51:02,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 112 states have (on average 1.0267857142857142) internal successors, (115), 112 states have internal predecessors, (115), 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 18:51:02,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2021-05-02 18:51:02,809 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 113 [2021-05-02 18:51:02,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:02,809 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2021-05-02 18:51:02,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 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 18:51:02,809 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2021-05-02 18:51:02,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-02 18:51:02,810 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:02,810 INFO L523 BasicCegarLoop]: trace histogram [52, 40, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:03,020 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:03,021 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:03,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:03,021 INFO L82 PathProgramCache]: Analyzing trace with hash 361637202, now seen corresponding path program 38 times [2021-05-02 18:51:03,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:03,021 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461866449] [2021-05-02 18:51:03,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:03,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:04,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:04,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:04,170 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 943 proven. 1640 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 18:51:04,170 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:04,170 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461866449] [2021-05-02 18:51:04,170 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1461866449] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:04,170 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [49559852] [2021-05-02 18:51:04,171 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:04,224 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:51:04,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:04,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 107 conjunts are in the unsatisfiable core [2021-05-02 18:51:04,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:05,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:05,062 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:51:05,062 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [49559852] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:05,062 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:05,062 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 55] total 57 [2021-05-02 18:51:05,062 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298076059] [2021-05-02 18:51:05,063 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 18:51:05,063 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:05,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 18:51:05,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=3040, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 18:51:05,063 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 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 18:51:09,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:09,340 INFO L93 Difference]: Finished difference Result 119 states and 121 transitions. [2021-05-02 18:51:09,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 18:51:09,340 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 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 115 [2021-05-02 18:51:09,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:09,341 INFO L225 Difference]: With dead ends: 119 [2021-05-02 18:51:09,341 INFO L226 Difference]: Without dead ends: 119 [2021-05-02 18:51:09,342 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 848 ImplicationChecksByTransitivity, 3654.0ms TimeCoverageRelationStatistics Valid=357, Invalid=9149, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 18:51:09,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-02 18:51:09,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-05-02 18:51:09,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.0263157894736843) internal successors, (117), 114 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 18:51:09,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2021-05-02 18:51:09,344 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 115 [2021-05-02 18:51:09,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:09,344 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2021-05-02 18:51:09,344 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 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 18:51:09,345 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2021-05-02 18:51:09,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-02 18:51:09,345 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:09,345 INFO L523 BasicCegarLoop]: trace histogram [53, 41, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:09,560 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-02 18:51:09,561 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:09,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:09,561 INFO L82 PathProgramCache]: Analyzing trace with hash 568724240, now seen corresponding path program 39 times [2021-05-02 18:51:09,561 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:09,561 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [433249075] [2021-05-02 18:51:09,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:09,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:10,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:10,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:10,670 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 966 proven. 1722 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 18:51:10,671 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:10,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [433249075] [2021-05-02 18:51:10,671 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [433249075] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:10,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1960700202] [2021-05-02 18:51:10,671 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:11,000 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-05-02 18:51:11,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:11,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 18:51:11,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:13,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:13,240 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 1025 proven. 144 refuted. 0 times theorem prover too weak. 1640 trivial. 0 not checked. [2021-05-02 18:51:13,240 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1960700202] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:13,240 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:13,240 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 15] total 58 [2021-05-02 18:51:13,240 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466966712] [2021-05-02 18:51:13,240 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 18:51:13,240 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:13,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 18:51:13,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=2942, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 18:51:13,241 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 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 18:51:18,782 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:51:21,188 WARN L205 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:51:22,793 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:51:25,839 WARN L205 SmtUtils]: Spent 356.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 18:51:29,438 WARN L205 SmtUtils]: Spent 508.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:51:32,693 WARN L205 SmtUtils]: Spent 469.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:51:34,999 WARN L205 SmtUtils]: Spent 378.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:51:36,616 WARN L205 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:51:37,486 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:51:38,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:38,209 INFO L93 Difference]: Finished difference Result 125 states and 128 transitions. [2021-05-02 18:51:38,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 18:51:38,210 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 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 117 [2021-05-02 18:51:38,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:38,211 INFO L225 Difference]: With dead ends: 125 [2021-05-02 18:51:38,211 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 18:51:38,211 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 114 SyntacticMatches, 5 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1645 ImplicationChecksByTransitivity, 24571.1ms TimeCoverageRelationStatistics Valid=1013, Invalid=11869, Unknown=0, NotChecked=0, Total=12882 [2021-05-02 18:51:38,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 18:51:38,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2021-05-02 18:51:38,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 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 18:51:38,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 125 transitions. [2021-05-02 18:51:38,214 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 125 transitions. Word has length 117 [2021-05-02 18:51:38,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:38,214 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 125 transitions. [2021-05-02 18:51:38,214 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 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 18:51:38,214 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 125 transitions. [2021-05-02 18:51:38,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-02 18:51:38,215 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:38,215 INFO L523 BasicCegarLoop]: trace histogram [55, 42, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:38,418 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:38,419 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:38,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:38,419 INFO L82 PathProgramCache]: Analyzing trace with hash 651885483, now seen corresponding path program 40 times [2021-05-02 18:51:38,419 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:38,419 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134383778] [2021-05-02 18:51:38,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:38,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:39,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:39,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:39,770 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 1075 proven. 1806 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:51:39,770 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:39,770 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134383778] [2021-05-02 18:51:39,770 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134383778] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:39,770 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [999142148] [2021-05-02 18:51:39,771 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:39,841 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:51:39,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:39,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-02 18:51:39,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:40,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:40,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:40,216 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 1075 proven. 1806 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:51:40,216 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [999142148] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:40,216 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:40,216 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 18:51:40,216 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331322582] [2021-05-02 18:51:40,217 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 18:51:40,217 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:40,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 18:51:40,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 18:51:40,217 INFO L87 Difference]: Start difference. First operand 123 states and 125 transitions. Second operand has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 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 18:51:44,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:44,535 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2021-05-02 18:51:44,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 18:51:44,536 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 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 121 [2021-05-02 18:51:44,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:44,536 INFO L225 Difference]: With dead ends: 125 [2021-05-02 18:51:44,536 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 18:51:44,537 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 3449.9ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 18:51:44,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 18:51:44,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2021-05-02 18:51:44,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 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 18:51:44,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2021-05-02 18:51:44,539 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 121 [2021-05-02 18:51:44,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:44,540 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2021-05-02 18:51:44,540 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 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 18:51:44,540 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2021-05-02 18:51:44,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-02 18:51:44,540 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:44,541 INFO L523 BasicCegarLoop]: trace histogram [56, 43, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:44,756 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:44,757 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:44,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:44,757 INFO L82 PathProgramCache]: Analyzing trace with hash -1949099287, now seen corresponding path program 41 times [2021-05-02 18:51:44,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:44,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [291991899] [2021-05-02 18:51:44,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:44,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:46,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:46,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:46,138 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 1100 proven. 1892 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:51:46,138 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:46,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [291991899] [2021-05-02 18:51:46,138 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [291991899] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:46,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [341865372] [2021-05-02 18:51:46,138 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 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:21,170 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 57 check-sat command(s) [2021-05-02 18:52:21,170 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:21,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 134 conjunts are in the unsatisfiable core [2021-05-02 18:52:21,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:23,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:23,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:23,945 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 893 proven. 2162 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:52:23,946 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [341865372] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:23,946 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:23,946 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 49] total 51 [2021-05-02 18:52:23,946 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192108710] [2021-05-02 18:52:23,946 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 18:52:23,947 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:23,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 18:52:23,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2407, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 18:52:23,947 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 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 18:52:30,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:30,322 INFO L93 Difference]: Finished difference Result 127 states and 129 transitions. [2021-05-02 18:52:30,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 18:52:30,323 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 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 123 [2021-05-02 18:52:30,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:30,324 INFO L225 Difference]: With dead ends: 127 [2021-05-02 18:52:30,324 INFO L226 Difference]: Without dead ends: 127 [2021-05-02 18:52:30,325 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 82 SyntacticMatches, 40 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1034 ImplicationChecksByTransitivity, 6668.9ms TimeCoverageRelationStatistics Valid=363, Invalid=8567, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 18:52:30,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-02 18:52:30,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-05-02 18:52:30,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0245901639344261) internal successors, (125), 122 states have internal predecessors, (125), 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 18:52:30,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 129 transitions. [2021-05-02 18:52:30,328 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 129 transitions. Word has length 123 [2021-05-02 18:52:30,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:30,328 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 129 transitions. [2021-05-02 18:52:30,328 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 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 18:52:30,328 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 129 transitions. [2021-05-02 18:52:30,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-02 18:52:30,329 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:30,329 INFO L523 BasicCegarLoop]: trace histogram [57, 44, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:30,537 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 18:52:30,538 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:30,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:30,538 INFO L82 PathProgramCache]: Analyzing trace with hash -1824496985, now seen corresponding path program 42 times [2021-05-02 18:52:30,538 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:30,538 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753946634] [2021-05-02 18:52:30,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:30,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:32,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:32,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:32,684 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1125 proven. 1980 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:52:32,685 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:32,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753946634] [2021-05-02 18:52:32,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [753946634] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:32,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2140222027] [2021-05-02 18:52:32,685 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 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:46,603 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2021-05-02 18:52:46,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:46,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 18:52:46,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:46,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:46,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:48,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:48,633 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1215 proven. 226 refuted. 0 times theorem prover too weak. 1808 trivial. 0 not checked. [2021-05-02 18:52:48,633 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2140222027] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:48,633 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:48,634 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 16] total 62 [2021-05-02 18:52:48,634 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16716647] [2021-05-02 18:52:48,634 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-02 18:52:48,634 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:48,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-02 18:52:48,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=549, Invalid=3233, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 18:52:48,635 INFO L87 Difference]: Start difference. First operand 127 states and 129 transitions. Second operand has 62 states, 62 states have (on average 2.129032258064516) internal successors, (132), 61 states have internal predecessors, (132), 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 18:52:54,275 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 45 [2021-05-02 18:52:55,905 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:52:58,593 WARN L205 SmtUtils]: Spent 368.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 18:53:02,804 WARN L205 SmtUtils]: Spent 358.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:53:07,504 WARN L205 SmtUtils]: Spent 425.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 18:53:13,699 WARN L205 SmtUtils]: Spent 438.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:53:16,203 WARN L205 SmtUtils]: Spent 402.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 18:53:18,041 WARN L205 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:53:19,540 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:53:21,184 WARN L205 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:53:22,558 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:53:24,498 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 42 [2021-05-02 18:53:25,235 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2021-05-02 18:53:25,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:25,812 INFO L93 Difference]: Finished difference Result 133 states and 136 transitions. [2021-05-02 18:53:25,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-02 18:53:25,813 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.129032258064516) internal successors, (132), 61 states have internal predecessors, (132), 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 125 [2021-05-02 18:53:25,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:25,814 INFO L225 Difference]: With dead ends: 133 [2021-05-02 18:53:25,814 INFO L226 Difference]: Without dead ends: 133 [2021-05-02 18:53:25,815 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 124 SyntacticMatches, 3 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1948 ImplicationChecksByTransitivity, 38050.8ms TimeCoverageRelationStatistics Valid=1471, Invalid=13291, Unknown=0, NotChecked=0, Total=14762 [2021-05-02 18:53:25,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-02 18:53:25,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 131. [2021-05-02 18:53:25,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.0238095238095237) internal successors, (129), 126 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 18:53:25,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2021-05-02 18:53:25,817 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 125 [2021-05-02 18:53:25,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:25,817 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2021-05-02 18:53:25,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 2.129032258064516) internal successors, (132), 61 states have internal predecessors, (132), 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 18:53:25,817 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2021-05-02 18:53:25,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-05-02 18:53:25,818 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:25,818 INFO L523 BasicCegarLoop]: trace histogram [59, 45, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:26,024 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-02 18:53:26,024 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:26,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:26,025 INFO L82 PathProgramCache]: Analyzing trace with hash 2022845314, now seen corresponding path program 43 times [2021-05-02 18:53:26,025 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:26,025 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445372738] [2021-05-02 18:53:26,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:26,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:27,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:27,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:27,721 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 1242 proven. 2070 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 18:53:27,722 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:27,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445372738] [2021-05-02 18:53:27,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [445372738] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:27,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297673605] [2021-05-02 18:53:27,722 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 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:27,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:27,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 94 conjunts are in the unsatisfiable core [2021-05-02 18:53:27,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:28,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:28,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:28,181 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 1242 proven. 2070 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 18:53:28,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [297673605] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:28,181 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:28,181 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 18:53:28,181 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170168696] [2021-05-02 18:53:28,181 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 18:53:28,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:28,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 18:53:28,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:53:28,182 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 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 18:53:33,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:33,136 INFO L93 Difference]: Finished difference Result 133 states and 135 transitions. [2021-05-02 18:53:33,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 18:53:33,137 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 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 129 [2021-05-02 18:53:33,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:33,138 INFO L225 Difference]: With dead ends: 133 [2021-05-02 18:53:33,138 INFO L226 Difference]: Without dead ends: 133 [2021-05-02 18:53:33,139 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1040 ImplicationChecksByTransitivity, 4113.9ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 18:53:33,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-02 18:53:33,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-05-02 18:53:33,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:53:33,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-05-02 18:53:33,141 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 129 [2021-05-02 18:53:33,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:33,142 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-05-02 18:53:33,142 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 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 18:53:33,142 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-05-02 18:53:33,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 18:53:33,142 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:33,142 INFO L523 BasicCegarLoop]: trace histogram [60, 46, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:33,343 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 18:53:33,343 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:33,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:33,343 INFO L82 PathProgramCache]: Analyzing trace with hash -1752290112, now seen corresponding path program 44 times [2021-05-02 18:53:33,343 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:33,344 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807606880] [2021-05-02 18:53:33,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:33,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:35,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:35,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:35,052 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 1269 proven. 2162 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 18:53:35,052 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:35,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807606880] [2021-05-02 18:53:35,052 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [807606880] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:35,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870830996] [2021-05-02 18:53:35,053 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:35,110 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:53:35,110 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:35,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 123 conjunts are in the unsatisfiable core [2021-05-02 18:53:35,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:36,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:36,403 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:53:36,404 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [870830996] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:36,404 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:36,404 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 63] total 65 [2021-05-02 18:53:36,404 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902713632] [2021-05-02 18:53:36,404 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-02 18:53:36,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:36,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-02 18:53:36,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=3986, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 18:53:36,405 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 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 18:53:43,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:43,005 INFO L93 Difference]: Finished difference Result 135 states and 137 transitions. [2021-05-02 18:53:43,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 18:53:43,006 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 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 18:53:43,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:43,006 INFO L225 Difference]: With dead ends: 135 [2021-05-02 18:53:43,006 INFO L226 Difference]: Without dead ends: 135 [2021-05-02 18:53:43,007 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1113 ImplicationChecksByTransitivity, 5490.9ms TimeCoverageRelationStatistics Valid=409, Invalid=12023, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 18:53:43,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-02 18:53:43,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2021-05-02 18:53:43,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 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 18:53:43,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 137 transitions. [2021-05-02 18:53:43,009 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 137 transitions. Word has length 131 [2021-05-02 18:53:43,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:43,010 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 137 transitions. [2021-05-02 18:53:43,010 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 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 18:53:43,010 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 137 transitions. [2021-05-02 18:53:43,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-02 18:53:43,010 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:43,010 INFO L523 BasicCegarLoop]: trace histogram [61, 47, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:43,211 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:43,211 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:43,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:43,211 INFO L82 PathProgramCache]: Analyzing trace with hash -410069378, now seen corresponding path program 45 times [2021-05-02 18:53:43,212 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:43,212 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178413516] [2021-05-02 18:53:43,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:43,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:44,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:44,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:44,868 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 1296 proven. 2256 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 18:53:44,868 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:44,868 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178413516] [2021-05-02 18:53:44,868 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1178413516] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:44,868 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597264758] [2021-05-02 18:53:44,868 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 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:45,486 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-05-02 18:53:45,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:45,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 50 conjunts are in the unsatisfiable core [2021-05-02 18:53:45,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:52,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:52,277 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 1363 proven. 196 refuted. 0 times theorem prover too weak. 2162 trivial. 0 not checked. [2021-05-02 18:53:52,277 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597264758] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:52,277 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:52,277 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 17] total 66 [2021-05-02 18:53:52,277 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999613398] [2021-05-02 18:53:52,278 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 18:53:52,278 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:52,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 18:53:52,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=386, Invalid=3904, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:53:52,279 INFO L87 Difference]: Start difference. First operand 135 states and 137 transitions. Second operand has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 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 18:54:00,902 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:54:02,706 WARN L205 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:54:05,013 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:54:07,302 WARN L205 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:54:09,480 WARN L205 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:54:12,507 WARN L205 SmtUtils]: Spent 387.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:54:15,275 WARN L205 SmtUtils]: Spent 360.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:54:18,868 WARN L205 SmtUtils]: Spent 308.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:54:21,724 WARN L205 SmtUtils]: Spent 417.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:54:23,571 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:54:24,828 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:54:26,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:54:26,043 INFO L93 Difference]: Finished difference Result 141 states and 144 transitions. [2021-05-02 18:54:26,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-02 18:54:26,044 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 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 133 [2021-05-02 18:54:26,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:54:26,045 INFO L225 Difference]: With dead ends: 141 [2021-05-02 18:54:26,045 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 18:54:26,045 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 126 SyntacticMatches, 9 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2145 ImplicationChecksByTransitivity, 37202.2ms TimeCoverageRelationStatistics Valid=1089, Invalid=15681, Unknown=0, NotChecked=0, Total=16770 [2021-05-02 18:54:26,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 18:54:26,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 139. [2021-05-02 18:54:26,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0223880597014925) internal successors, (137), 134 states have internal predecessors, (137), 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 18:54:26,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2021-05-02 18:54:26,047 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 133 [2021-05-02 18:54:26,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:54:26,048 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2021-05-02 18:54:26,048 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 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 18:54:26,048 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2021-05-02 18:54:26,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 18:54:26,049 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:54:26,049 INFO L523 BasicCegarLoop]: trace histogram [63, 48, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:54:26,255 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 18:54:26,256 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:54:26,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:54:26,256 INFO L82 PathProgramCache]: Analyzing trace with hash 522545049, now seen corresponding path program 46 times [2021-05-02 18:54:26,256 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:54:26,256 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80785478] [2021-05-02 18:54:26,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:54:26,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:28,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:54:28,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:28,546 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 1421 proven. 2352 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 18:54:28,546 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:54:28,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80785478] [2021-05-02 18:54:28,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80785478] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:28,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271454906] [2021-05-02 18:54:28,547 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 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:54:28,635 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:54:28,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:54:28,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 100 conjunts are in the unsatisfiable core [2021-05-02 18:54:28,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:54:29,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:54:29,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:54:29,243 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 1421 proven. 2352 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 18:54:29,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271454906] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:29,243 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:54:29,243 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-02 18:54:29,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402716195] [2021-05-02 18:54:29,244 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 18:54:29,244 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:54:29,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 18:54:29,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 18:54:29,244 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 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 18:54:36,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:54:36,682 INFO L93 Difference]: Finished difference Result 141 states and 143 transitions. [2021-05-02 18:54:36,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 18:54:36,684 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 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 137 [2021-05-02 18:54:36,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:54:36,685 INFO L225 Difference]: With dead ends: 141 [2021-05-02 18:54:36,685 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 18:54:36,685 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 137 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1181 ImplicationChecksByTransitivity, 5584.6ms TimeCoverageRelationStatistics Valid=397, Invalid=9905, Unknown=0, NotChecked=0, Total=10302 [2021-05-02 18:54:36,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 18:54:36,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2021-05-02 18:54:36,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 136 states have (on average 1.0220588235294117) internal successors, (139), 136 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 18:54:36,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2021-05-02 18:54:36,688 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 137 [2021-05-02 18:54:36,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:54:36,688 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2021-05-02 18:54:36,688 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 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 18:54:36,688 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2021-05-02 18:54:36,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-05-02 18:54:36,689 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:54:36,689 INFO L523 BasicCegarLoop]: trace histogram [64, 49, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:54:36,896 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:54:36,897 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:54:36,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:54:36,897 INFO L82 PathProgramCache]: Analyzing trace with hash -1356641577, now seen corresponding path program 47 times [2021-05-02 18:54:36,897 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:54:36,897 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700476549] [2021-05-02 18:54:36,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:54:36,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:39,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:54:39,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:39,051 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 1450 proven. 2450 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 18:54:39,051 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:54:39,051 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700476549] [2021-05-02 18:54:39,051 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1700476549] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:39,051 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [609535109] [2021-05-02 18:54:39,051 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:55:25,589 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 65 check-sat command(s) [2021-05-02 18:55:25,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:55:25,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 115 conjunts are in the unsatisfiable core [2021-05-02 18:55:25,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:55:27,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:27,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:27,165 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 1045 proven. 2970 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:55:27,166 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [609535109] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:27,166 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:55:27,166 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 57] total 59 [2021-05-02 18:55:27,166 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000262837] [2021-05-02 18:55:27,166 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 18:55:27,166 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:55:27,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 18:55:27,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=3257, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 18:55:27,167 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 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 18:55:37,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:55:37,687 INFO L93 Difference]: Finished difference Result 143 states and 145 transitions. [2021-05-02 18:55:37,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 18:55:37,689 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 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 139 [2021-05-02 18:55:37,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:55:37,690 INFO L225 Difference]: With dead ends: 143 [2021-05-02 18:55:37,690 INFO L226 Difference]: Without dead ends: 143 [2021-05-02 18:55:37,691 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 131 SyntacticMatches, 5 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 7290.0ms TimeCoverageRelationStatistics Valid=415, Invalid=11357, Unknown=0, NotChecked=0, Total=11772 [2021-05-02 18:55:37,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-02 18:55:37,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-05-02 18:55:37,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.0217391304347827) internal successors, (141), 138 states have internal predecessors, (141), 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 18:55:37,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2021-05-02 18:55:37,692 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 139 [2021-05-02 18:55:37,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:55:37,693 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2021-05-02 18:55:37,693 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 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 18:55:37,693 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2021-05-02 18:55:37,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-05-02 18:55:37,693 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:55:37,694 INFO L523 BasicCegarLoop]: trace histogram [65, 50, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:55:37,901 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:55:37,901 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:55:37,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:55:37,901 INFO L82 PathProgramCache]: Analyzing trace with hash 926242453, now seen corresponding path program 48 times [2021-05-02 18:55:37,901 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:55:37,901 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117455529] [2021-05-02 18:55:37,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:55:37,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:41,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:55:41,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:41,052 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 1479 proven. 2550 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 18:55:41,053 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:55:41,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117455529] [2021-05-02 18:55:41,053 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [117455529] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:41,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396263431] [2021-05-02 18:55:41,053 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:56:02,405 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 63 check-sat command(s) [2021-05-02 18:56:02,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:56:02,415 WARN L261 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 180 conjunts are in the unsatisfiable core [2021-05-02 18:56:02,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:56:02,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:56:02,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:56:11,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:56:11,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:56:11,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:56:11,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:56:22,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:56:22,203 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 1459 proven. 2643 refuted. 0 times theorem prover too weak. 123 trivial. 0 not checked. [2021-05-02 18:56:22,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396263431] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:56:22,203 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:56:22,203 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 56] total 97 [2021-05-02 18:56:22,204 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932539221] [2021-05-02 18:56:22,204 INFO L460 AbstractCegarLoop]: Interpolant automaton has 97 states [2021-05-02 18:56:22,204 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:56:22,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-05-02 18:56:22,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1797, Invalid=7515, Unknown=0, NotChecked=0, Total=9312 [2021-05-02 18:56:22,205 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 97 states, 97 states have (on average 2.082474226804124) internal successors, (202), 96 states have internal predecessors, (202), 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 18:56:33,576 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 42 [2021-05-02 18:56:34,697 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:56:35,781 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:56:36,719 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:56:37,857 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:56:39,378 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:56:40,680 WARN L205 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:56:41,781 WARN L205 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:56:43,192 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:56:44,546 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:56:46,061 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:56:47,540 WARN L205 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:56:58,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:56:58,849 INFO L93 Difference]: Finished difference Result 200 states and 228 transitions. [2021-05-02 18:56:58,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-05-02 18:56:58,849 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 2.082474226804124) internal successors, (202), 96 states have internal predecessors, (202), 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 141 [2021-05-02 18:56:58,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:56:58,850 INFO L225 Difference]: With dead ends: 200 [2021-05-02 18:56:58,850 INFO L226 Difference]: Without dead ends: 200 [2021-05-02 18:56:58,851 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 92 SyntacticMatches, 26 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7164 ImplicationChecksByTransitivity, 50853.4ms TimeCoverageRelationStatistics Valid=5304, Invalid=30986, Unknown=0, NotChecked=0, Total=36290 [2021-05-02 18:56:58,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-05-02 18:56:58,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 148. [2021-05-02 18:56:58,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 143 states have (on average 1.020979020979021) internal successors, (146), 143 states have internal predecessors, (146), 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 18:56:58,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 150 transitions. [2021-05-02 18:56:58,853 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 150 transitions. Word has length 141 [2021-05-02 18:56:58,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:56:58,853 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 150 transitions. [2021-05-02 18:56:58,853 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 97 states, 97 states have (on average 2.082474226804124) internal successors, (202), 96 states have internal predecessors, (202), 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 18:56:58,854 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 150 transitions. [2021-05-02 18:56:58,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-05-02 18:56:58,854 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:56:58,854 INFO L523 BasicCegarLoop]: trace histogram [68, 51, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:56:59,054 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-02 18:56:59,055 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:56:59,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:56:59,055 INFO L82 PathProgramCache]: Analyzing trace with hash -2029190707, now seen corresponding path program 49 times [2021-05-02 18:56:59,055 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:56:59,055 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772412223] [2021-05-02 18:56:59,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:56:59,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:57:03,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:57:03,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:57:03,323 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 1716 proven. 2652 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 18:57:03,323 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:57:03,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [772412223] [2021-05-02 18:57:03,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [772412223] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:57:03,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338053940] [2021-05-02 18:57:03,324 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:57:03,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:57:03,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 106 conjunts are in the unsatisfiable core [2021-05-02 18:57:03,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:57:04,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:57:04,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:57:04,344 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 1716 proven. 2652 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 18:57:04,344 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338053940] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:57:04,344 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:57:04,344 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54] total 56 [2021-05-02 18:57:04,344 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133880388] [2021-05-02 18:57:04,345 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 18:57:04,345 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:57:04,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 18:57:04,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2919, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:57:04,345 INFO L87 Difference]: Start difference. First operand 148 states and 150 transitions. Second operand has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 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 18:57:15,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:57:15,645 INFO L93 Difference]: Finished difference Result 150 states and 152 transitions. [2021-05-02 18:57:15,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 18:57:15,647 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 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 147 [2021-05-02 18:57:15,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:57:15,648 INFO L225 Difference]: With dead ends: 150 [2021-05-02 18:57:15,648 INFO L226 Difference]: Without dead ends: 150 [2021-05-02 18:57:15,648 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 147 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1331 ImplicationChecksByTransitivity, 8939.6ms TimeCoverageRelationStatistics Valid=421, Invalid=11135, Unknown=0, NotChecked=0, Total=11556 [2021-05-02 18:57:15,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-05-02 18:57:15,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 150. [2021-05-02 18:57:15,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 145 states have (on average 1.0206896551724138) internal successors, (148), 145 states have internal predecessors, (148), 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 18:57:15,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 152 transitions. [2021-05-02 18:57:15,650 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 152 transitions. Word has length 147 [2021-05-02 18:57:15,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:57:15,651 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 152 transitions. [2021-05-02 18:57:15,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 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 18:57:15,651 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 152 transitions. [2021-05-02 18:57:15,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-02 18:57:15,652 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:57:15,652 INFO L523 BasicCegarLoop]: trace histogram [69, 52, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:57:15,864 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:57:15,865 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:57:15,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:57:15,865 INFO L82 PathProgramCache]: Analyzing trace with hash -659656821, now seen corresponding path program 50 times [2021-05-02 18:57:15,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:57:15,865 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [455965832] [2021-05-02 18:57:15,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:57:15,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:57:19,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:57:19,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:57:19,262 INFO L134 CoverageAnalysis]: Checked inductivity of 4761 backedges. 1749 proven. 2756 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 18:57:19,262 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:57:19,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [455965832] [2021-05-02 18:57:19,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [455965832] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:57:19,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365531811] [2021-05-02 18:57:19,262 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:57:19,324 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:57:19,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:57:19,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 141 conjunts are in the unsatisfiable core [2021-05-02 18:57:19,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:57:22,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:57:22,262 INFO L134 CoverageAnalysis]: Checked inductivity of 4761 backedges. 0 proven. 4761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:57:22,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1365531811] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:57:22,262 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:57:22,262 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 72] total 74 [2021-05-02 18:57:22,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183162435] [2021-05-02 18:57:22,263 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-02 18:57:22,263 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:57:22,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-02 18:57:22,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=5204, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 18:57:22,263 INFO L87 Difference]: Start difference. First operand 150 states and 152 transitions. Second operand has 74 states, 74 states have (on average 2.054054054054054) internal successors, (152), 73 states have internal predecessors, (152), 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 18:57:37,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:57:37,634 INFO L93 Difference]: Finished difference Result 152 states and 154 transitions. [2021-05-02 18:57:37,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 18:57:37,636 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.054054054054054) internal successors, (152), 73 states have internal predecessors, (152), 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 149 [2021-05-02 18:57:37,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:57:37,637 INFO L225 Difference]: With dead ends: 152 [2021-05-02 18:57:37,637 INFO L226 Difference]: Without dead ends: 152 [2021-05-02 18:57:37,637 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1416 ImplicationChecksByTransitivity, 11253.0ms TimeCoverageRelationStatistics Valid=463, Invalid=15539, Unknown=0, NotChecked=0, Total=16002 [2021-05-02 18:57:37,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-02 18:57:37,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2021-05-02 18:57:37,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 147 states have (on average 1.0204081632653061) internal successors, (150), 147 states have internal predecessors, (150), 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 18:57:37,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 154 transitions. [2021-05-02 18:57:37,640 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 154 transitions. Word has length 149 [2021-05-02 18:57:37,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:57:37,640 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 154 transitions. [2021-05-02 18:57:37,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 74 states have (on average 2.054054054054054) internal successors, (152), 73 states have internal predecessors, (152), 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 18:57:37,640 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 154 transitions. [2021-05-02 18:57:37,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-05-02 18:57:37,641 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:57:37,641 INFO L523 BasicCegarLoop]: trace histogram [70, 53, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:57:37,863 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-02 18:57:37,863 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:57:37,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:57:37,864 INFO L82 PathProgramCache]: Analyzing trace with hash 1202415049, now seen corresponding path program 51 times [2021-05-02 18:57:37,864 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:57:37,864 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546582642] [2021-05-02 18:57:37,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:57:37,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:57:41,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:57:41,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:57:41,371 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1782 proven. 2862 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 18:57:41,371 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:57:41,371 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546582642] [2021-05-02 18:57:41,371 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546582642] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:57:41,371 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [734054264] [2021-05-02 18:57:41,371 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:57:42,045 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2021-05-02 18:57:42,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:57:42,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 18:57:42,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:57:42,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:57:49,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:57:49,369 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1855 proven. 289 refuted. 0 times theorem prover too weak. 2756 trivial. 0 not checked. [2021-05-02 18:57:49,370 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [734054264] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:57:49,370 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:57:49,370 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 20] total 75 [2021-05-02 18:57:49,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296958081] [2021-05-02 18:57:49,370 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-02 18:57:49,370 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:57:49,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-02 18:57:49,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=720, Invalid=4830, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 18:57:49,371 INFO L87 Difference]: Start difference. First operand 152 states and 154 transitions. Second operand has 75 states, 75 states have (on average 2.0933333333333333) internal successors, (157), 74 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 18:58:04,739 WARN L205 SmtUtils]: Spent 296.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 45 [2021-05-02 18:58:08,976 WARN L205 SmtUtils]: Spent 947.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 18:58:17,127 WARN L205 SmtUtils]: Spent 666.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:58:25,583 WARN L205 SmtUtils]: Spent 969.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 42 [2021-05-02 18:58:38,213 WARN L205 SmtUtils]: Spent 1.72 s on a formula simplification. DAG size of input: 98 DAG size of output: 42 [2021-05-02 18:58:51,682 WARN L205 SmtUtils]: Spent 1.75 s on a formula simplification. DAG size of input: 102 DAG size of output: 42 [2021-05-02 18:59:16,156 WARN L205 SmtUtils]: Spent 2.30 s on a formula simplification. DAG size of input: 106 DAG size of output: 42 [2021-05-02 18:59:38,340 WARN L205 SmtUtils]: Spent 2.34 s on a formula simplification. DAG size of input: 102 DAG size of output: 42 [2021-05-02 19:00:00,075 WARN L205 SmtUtils]: Spent 2.82 s on a formula simplification. DAG size of input: 98 DAG size of output: 42 [2021-05-02 19:00:23,832 WARN L205 SmtUtils]: Spent 3.09 s on a formula simplification. DAG size of input: 94 DAG size of output: 42 [2021-05-02 19:00:44,163 WARN L205 SmtUtils]: Spent 1.27 s on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 19:01:02,022 WARN L205 SmtUtils]: Spent 869.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 19:01:18,032 WARN L205 SmtUtils]: Spent 996.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 19:01:31,886 WARN L205 SmtUtils]: Spent 1.16 s on a formula simplification. DAG size of input: 78 DAG size of output: 42