/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/loop-simple/nested_5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 19:06:49,787 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 19:06:49,789 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 19:06:49,808 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 19:06:49,808 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 19:06:49,809 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 19:06:49,810 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 19:06:49,811 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 19:06:49,812 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 19:06:49,813 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 19:06:49,814 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 19:06:49,814 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 19:06:49,815 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 19:06:49,815 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 19:06:49,816 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 19:06:49,817 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 19:06:49,817 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 19:06:49,818 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 19:06:49,825 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 19:06:49,827 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 19:06:49,828 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 19:06:49,831 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 19:06:49,831 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 19:06:49,832 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 19:06:49,833 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 19:06:49,834 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 19:06:49,834 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 19:06:49,834 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 19:06:49,835 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 19:06:49,835 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 19:06:49,835 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 19:06:49,836 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 19:06:49,836 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 19:06:49,837 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 19:06:49,838 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 19:06:49,838 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 19:06:49,838 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 19:06:49,838 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 19:06:49,839 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 19:06:49,839 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 19:06:49,840 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 19:06:49,845 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 19:06:49,851 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 19:06:49,852 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 19:06:49,853 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 19:06:49,853 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 19:06:49,853 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 19:06:49,853 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 19:06:49,853 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 19:06:49,853 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 19:06:49,853 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 19:06:49,853 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 19:06:49,854 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 19:06:49,854 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 19:06:49,854 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 19:06:49,854 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 19:06:49,854 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 19:06:49,854 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 19:06:49,854 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 19:06:49,854 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 19:06:49,854 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 19:06:49,855 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 19:06:49,855 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 19:06:49,855 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 19:06:49,855 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 19:06:50,132 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 19:06:50,155 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 19:06:50,157 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 19:06:50,157 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 19:06:50,158 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 19:06:50,159 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-simple/nested_5.c [2021-05-02 19:06:50,207 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3aa4cfc1e/55ea5a3ba9e64c0c8716fdbd69d3a1a7/FLAG1935cf673 [2021-05-02 19:06:50,553 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 19:06:50,553 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_5.c [2021-05-02 19:06:50,557 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3aa4cfc1e/55ea5a3ba9e64c0c8716fdbd69d3a1a7/FLAG1935cf673 [2021-05-02 19:06:50,571 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3aa4cfc1e/55ea5a3ba9e64c0c8716fdbd69d3a1a7 [2021-05-02 19:06:50,573 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 19:06:50,574 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 19:06:50,578 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 19:06:50,578 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 19:06:50,581 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 19:06:50,581 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:06:50" (1/1) ... [2021-05-02 19:06:50,582 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1bb16058 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:50, skipping insertion in model container [2021-05-02 19:06:50,582 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:06:50" (1/1) ... [2021-05-02 19:06:50,587 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 19:06:50,600 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 19:06:50,733 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_5.c[899,912] [2021-05-02 19:06:50,747 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:06:50,752 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 19:06:50,762 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_5.c[899,912] [2021-05-02 19:06:50,763 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:06:50,771 INFO L208 MainTranslator]: Completed translation [2021-05-02 19:06:50,771 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:50 WrapperNode [2021-05-02 19:06:50,771 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 19:06:50,772 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 19:06:50,772 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 19:06:50,772 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 19:06:50,811 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:50" (1/1) ... [2021-05-02 19:06:50,811 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:50" (1/1) ... [2021-05-02 19:06:50,821 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:50" (1/1) ... [2021-05-02 19:06:50,821 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:50" (1/1) ... [2021-05-02 19:06:50,824 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:50" (1/1) ... [2021-05-02 19:06:50,827 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:50" (1/1) ... [2021-05-02 19:06:50,828 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:50" (1/1) ... [2021-05-02 19:06:50,829 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 19:06:50,829 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 19:06:50,829 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 19:06:50,830 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 19:06:50,830 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:50" (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 19:06:50,926 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 19:06:50,926 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 19:06:50,926 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 19:06:50,926 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 19:06:50,927 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 19:06:50,927 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 19:06:50,927 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 19:06:50,927 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 19:06:50,927 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 19:06:50,928 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 19:06:50,928 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 19:06:50,928 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 19:06:50,928 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 19:06:50,928 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 19:06:51,166 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 19:06:51,167 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-02 19:06:51,168 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:06:51 BoogieIcfgContainer [2021-05-02 19:06:51,168 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 19:06:51,168 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 19:06:51,168 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 19:06:51,169 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 19:06:51,171 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:06:51" (1/1) ... [2021-05-02 19:06:51,198 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:06:51 BasicIcfg [2021-05-02 19:06:51,198 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 19:06:51,199 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 19:06:51,199 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 19:06:51,201 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 19:06:51,201 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 07:06:50" (1/4) ... [2021-05-02 19:06:51,202 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@501b4d74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:06:51, skipping insertion in model container [2021-05-02 19:06:51,202 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:50" (2/4) ... [2021-05-02 19:06:51,202 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@501b4d74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:06:51, skipping insertion in model container [2021-05-02 19:06:51,202 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:06:51" (3/4) ... [2021-05-02 19:06:51,202 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@501b4d74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:06:51, skipping insertion in model container [2021-05-02 19:06:51,202 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:06:51" (4/4) ... [2021-05-02 19:06:51,203 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_5.cJordan [2021-05-02 19:06:51,206 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 19:06:51,222 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 19:06:51,234 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 19:06:51,261 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 19:06:51,261 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 19:06:51,261 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 19:06:51,261 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 19:06:51,261 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 19:06:51,261 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 19:06:51,261 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 19:06:51,261 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 19:06:51,276 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 19 states have internal predecessors, (30), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:06:51,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 19:06:51,282 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:51,283 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:51,283 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:51,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:51,287 INFO L82 PathProgramCache]: Analyzing trace with hash 2087165565, now seen corresponding path program 1 times [2021-05-02 19:06:51,293 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:51,294 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109343763] [2021-05-02 19:06:51,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:51,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:51,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:51,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:51,511 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 19:06:51,511 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:51,512 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109343763] [2021-05-02 19:06:51,512 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [109343763] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:51,513 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:06:51,514 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 19:06:51,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352324328] [2021-05-02 19:06:51,522 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 19:06:51,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:51,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 19:06:51,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:06:51,535 INFO L87 Difference]: Start difference. First operand has 24 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 19 states have internal predecessors, (30), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:51,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:51,563 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2021-05-02 19:06:51,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 19:06:51,565 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-05-02 19:06:51,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:51,571 INFO L225 Difference]: With dead ends: 24 [2021-05-02 19:06:51,571 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 19:06:51,573 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 52.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:06:51,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 19:06:51,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 19:06:51,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:51,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2021-05-02 19:06:51,596 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 9 [2021-05-02 19:06:51,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:51,596 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2021-05-02 19:06:51,597 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:51,597 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2021-05-02 19:06:51,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 19:06:51,598 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:51,598 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:51,598 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 19:06:51,598 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:51,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:51,599 INFO L82 PathProgramCache]: Analyzing trace with hash 2087166526, now seen corresponding path program 1 times [2021-05-02 19:06:51,599 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:51,599 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048086454] [2021-05-02 19:06:51,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:51,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:51,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:51,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:51,711 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 19:06:51,712 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:51,712 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048086454] [2021-05-02 19:06:51,712 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1048086454] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:51,712 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:06:51,712 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:06:51,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464880161] [2021-05-02 19:06:51,713 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:06:51,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:51,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:06:51,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:06:51,714 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:51,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:51,827 INFO L93 Difference]: Finished difference Result 29 states and 37 transitions. [2021-05-02 19:06:51,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:06:51,828 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-05-02 19:06:51,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:51,828 INFO L225 Difference]: With dead ends: 29 [2021-05-02 19:06:51,828 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 19:06:51,829 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 83.4ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:06:51,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 19:06:51,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 20. [2021-05-02 19:06:51,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.3125) internal successors, (21), 16 states have internal predecessors, (21), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:51,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-05-02 19:06:51,832 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 9 [2021-05-02 19:06:51,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:51,832 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-05-02 19:06:51,832 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:51,832 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-05-02 19:06:51,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 19:06:51,832 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:51,833 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:51,833 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 19:06:51,833 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:51,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:51,833 INFO L82 PathProgramCache]: Analyzing trace with hash 568010400, now seen corresponding path program 1 times [2021-05-02 19:06:51,833 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:51,833 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502130734] [2021-05-02 19:06:51,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:51,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:51,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:51,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:51,905 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:51,905 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:51,905 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502130734] [2021-05-02 19:06:51,905 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1502130734] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:51,905 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:06:51,905 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:06:51,905 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650436314] [2021-05-02 19:06:51,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:06:51,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:51,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:06:51,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:06:51,907 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:51,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:51,958 INFO L93 Difference]: Finished difference Result 28 states and 35 transitions. [2021-05-02 19:06:51,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:06:51,959 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 19:06:51,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:51,959 INFO L225 Difference]: With dead ends: 28 [2021-05-02 19:06:51,959 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 19:06:51,960 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 37.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:06:51,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 19:06:51,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 21. [2021-05-02 19:06:51,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:51,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-05-02 19:06:51,962 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 12 [2021-05-02 19:06:51,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:51,962 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-05-02 19:06:51,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:51,963 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-05-02 19:06:51,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 19:06:51,963 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:51,963 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:51,963 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 19:06:51,963 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:51,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:51,964 INFO L82 PathProgramCache]: Analyzing trace with hash -918082799, now seen corresponding path program 1 times [2021-05-02 19:06:51,964 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:51,964 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323556224] [2021-05-02 19:06:51,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:51,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:52,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:52,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:52,007 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:52,007 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:52,007 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323556224] [2021-05-02 19:06:52,008 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [323556224] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:52,008 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:06:52,008 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:06:52,008 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87750604] [2021-05-02 19:06:52,008 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:06:52,008 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:52,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:06:52,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:06:52,009 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:52,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:52,057 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2021-05-02 19:06:52,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:06:52,057 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 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 19:06:52,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:52,058 INFO L225 Difference]: With dead ends: 27 [2021-05-02 19:06:52,058 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 19:06:52,058 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 37.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:06:52,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 19:06:52,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 22. [2021-05-02 19:06:52,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:52,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2021-05-02 19:06:52,060 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 15 [2021-05-02 19:06:52,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:52,061 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2021-05-02 19:06:52,061 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:52,061 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2021-05-02 19:06:52,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 19:06:52,061 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:52,061 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:52,061 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 19:06:52,062 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:52,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:52,062 INFO L82 PathProgramCache]: Analyzing trace with hash 1067555700, now seen corresponding path program 1 times [2021-05-02 19:06:52,062 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:52,062 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605693729] [2021-05-02 19:06:52,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:52,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:52,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:52,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:52,103 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:52,104 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:52,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605693729] [2021-05-02 19:06:52,104 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [605693729] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:52,104 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:06:52,104 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:06:52,104 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215155891] [2021-05-02 19:06:52,104 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:06:52,105 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:52,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:06:52,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:06:52,105 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:52,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:52,156 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2021-05-02 19:06:52,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:06:52,156 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 19:06:52,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:52,157 INFO L225 Difference]: With dead ends: 26 [2021-05-02 19:06:52,157 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 19:06:52,157 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 37.9ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:06:52,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 19:06:52,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 23. [2021-05-02 19:06:52,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:52,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-05-02 19:06:52,160 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 18 [2021-05-02 19:06:52,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:52,160 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-05-02 19:06:52,160 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:52,160 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-05-02 19:06:52,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 19:06:52,160 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:52,161 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:52,161 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 19:06:52,161 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:52,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:52,161 INFO L82 PathProgramCache]: Analyzing trace with hash -495476152, now seen corresponding path program 1 times [2021-05-02 19:06:52,161 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:52,162 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643551514] [2021-05-02 19:06:52,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:52,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:52,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:52,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:52,203 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:52,204 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:52,204 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643551514] [2021-05-02 19:06:52,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643551514] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:52,204 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:06:52,204 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:06:52,204 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663423088] [2021-05-02 19:06:52,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:06:52,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:52,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:06:52,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:06:52,206 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:52,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:52,260 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2021-05-02 19:06:52,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:06:52,261 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 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 19:06:52,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:52,261 INFO L225 Difference]: With dead ends: 25 [2021-05-02 19:06:52,262 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 19:06:52,262 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 38.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:06:52,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 19:06:52,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-05-02 19:06:52,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:52,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-05-02 19:06:52,264 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 21 [2021-05-02 19:06:52,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:52,264 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-05-02 19:06:52,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:52,264 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-05-02 19:06:52,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 19:06:52,265 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:52,265 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:52,265 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 19:06:52,265 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:52,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:52,266 INFO L82 PathProgramCache]: Analyzing trace with hash 1040068038, now seen corresponding path program 1 times [2021-05-02 19:06:52,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:52,266 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583070550] [2021-05-02 19:06:52,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:52,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:52,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:52,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:52,308 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:52,308 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:52,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583070550] [2021-05-02 19:06:52,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [583070550] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:52,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1702571321] [2021-05-02 19:06:52,309 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 19:06:52,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:52,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 19:06:52,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:52,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:52,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:52,542 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:52,543 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1702571321] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:52,543 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:52,543 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 19:06:52,543 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646309368] [2021-05-02 19:06:52,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 19:06:52,544 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:52,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 19:06:52,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 19:06:52,544 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 1 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 19:06:52,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:52,621 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2021-05-02 19:06:52,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 19:06:52,622 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 1 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 23 [2021-05-02 19:06:52,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:52,622 INFO L225 Difference]: With dead ends: 27 [2021-05-02 19:06:52,622 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 19:06:52,623 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 65.3ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:06:52,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 19:06:52,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-02 19:06:52,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:52,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-05-02 19:06:52,625 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 23 [2021-05-02 19:06:52,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:52,625 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-05-02 19:06:52,625 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 1 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 19:06:52,625 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-05-02 19:06:52,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 19:06:52,626 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:52,626 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:52,841 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 19:06:52,842 INFO L428 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:52,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:52,842 INFO L82 PathProgramCache]: Analyzing trace with hash -770715196, now seen corresponding path program 2 times [2021-05-02 19:06:52,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:52,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1963220464] [2021-05-02 19:06:52,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:52,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:52,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:52,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:52,885 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 19:06:52,885 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:52,886 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1963220464] [2021-05-02 19:06:52,886 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1963220464] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:52,886 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [628328352] [2021-05-02 19:06:52,886 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 19:06:52,977 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:06:52,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:52,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 19:06:52,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:53,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:53,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:53,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:53,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:53,037 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:53,037 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [628328352] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:53,037 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:53,037 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-05-02 19:06:53,037 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263994291] [2021-05-02 19:06:53,037 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:06:53,038 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:53,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:06:53,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:06:53,038 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 1 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 19:06:53,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:53,324 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2021-05-02 19:06:53,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 19:06:53,325 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 1 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 25 [2021-05-02 19:06:53,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:53,325 INFO L225 Difference]: With dead ends: 48 [2021-05-02 19:06:53,325 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 19:06:53,326 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 254.9ms TimeCoverageRelationStatistics Valid=117, Invalid=225, Unknown=0, NotChecked=0, Total=342 [2021-05-02 19:06:53,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 19:06:53,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 37. [2021-05-02 19:06:53,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 33 states have internal predecessors, (39), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:53,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2021-05-02 19:06:53,328 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 25 [2021-05-02 19:06:53,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:53,328 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2021-05-02 19:06:53,329 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 1 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 19:06:53,329 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2021-05-02 19:06:53,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 19:06:53,329 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:53,329 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:53,549 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:53,549 INFO L428 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:53,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:53,550 INFO L82 PathProgramCache]: Analyzing trace with hash 1816585012, now seen corresponding path program 3 times [2021-05-02 19:06:53,550 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:53,550 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922886612] [2021-05-02 19:06:53,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:53,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:53,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:53,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:53,591 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-05-02 19:06:53,592 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:53,592 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922886612] [2021-05-02 19:06:53,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922886612] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:53,592 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [383009127] [2021-05-02 19:06:53,592 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 19:06:53,651 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 19:06:53,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:53,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 19:06:53,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:53,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:53,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:53,706 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 19:06:53,707 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [383009127] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:53,707 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:53,707 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2021-05-02 19:06:53,707 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056998006] [2021-05-02 19:06:53,707 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 19:06:53,707 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:53,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 19:06:53,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 19:06:53,708 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand has 7 states, 7 states have (on average 5.285714285714286) internal successors, (37), 6 states have internal predecessors, (37), 1 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 19:06:53,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:53,920 INFO L93 Difference]: Finished difference Result 213 states and 246 transitions. [2021-05-02 19:06:53,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 19:06:53,921 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.285714285714286) internal successors, (37), 6 states have internal predecessors, (37), 1 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 36 [2021-05-02 19:06:53,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:53,922 INFO L225 Difference]: With dead ends: 213 [2021-05-02 19:06:53,922 INFO L226 Difference]: Without dead ends: 213 [2021-05-02 19:06:53,922 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 162.3ms TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2021-05-02 19:06:53,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-05-02 19:06:53,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 106. [2021-05-02 19:06:53,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 102 states have (on average 1.1666666666666667) internal successors, (119), 102 states have internal predecessors, (119), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:53,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 122 transitions. [2021-05-02 19:06:53,928 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 122 transitions. Word has length 36 [2021-05-02 19:06:53,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:53,928 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 122 transitions. [2021-05-02 19:06:53,929 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 5.285714285714286) internal successors, (37), 6 states have internal predecessors, (37), 1 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 19:06:53,929 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 122 transitions. [2021-05-02 19:06:53,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 19:06:53,930 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:53,930 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 8, 8, 8, 4, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:54,152 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:54,152 INFO L428 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:54,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:54,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1680632228, now seen corresponding path program 4 times [2021-05-02 19:06:54,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:54,153 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413353550] [2021-05-02 19:06:54,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:54,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:54,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:54,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:54,220 INFO L134 CoverageAnalysis]: Checked inductivity of 898 backedges. 472 proven. 1 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2021-05-02 19:06:54,220 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:54,220 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413353550] [2021-05-02 19:06:54,220 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1413353550] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:54,220 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [202063304] [2021-05-02 19:06:54,220 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 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 19:06:54,299 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 19:06:54,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:54,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 19:06:54,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:54,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:54,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:54,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:54,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:54,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:54,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:54,426 INFO L134 CoverageAnalysis]: Checked inductivity of 898 backedges. 196 proven. 9 refuted. 0 times theorem prover too weak. 693 trivial. 0 not checked. [2021-05-02 19:06:54,426 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [202063304] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:54,426 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:54,427 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 9 [2021-05-02 19:06:54,427 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524652024] [2021-05-02 19:06:54,427 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:06:54,427 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:54,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:06:54,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:06:54,428 INFO L87 Difference]: Start difference. First operand 106 states and 122 transitions. Second operand has 9 states, 9 states have (on average 5.0) internal successors, (45), 8 states have internal predecessors, (45), 1 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 19:06:54,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:54,763 INFO L93 Difference]: Finished difference Result 356 states and 400 transitions. [2021-05-02 19:06:54,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 19:06:54,763 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.0) internal successors, (45), 8 states have internal predecessors, (45), 1 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 105 [2021-05-02 19:06:54,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:54,765 INFO L225 Difference]: With dead ends: 356 [2021-05-02 19:06:54,765 INFO L226 Difference]: Without dead ends: 356 [2021-05-02 19:06:54,765 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 296.2ms TimeCoverageRelationStatistics Valid=170, Invalid=336, Unknown=0, NotChecked=0, Total=506 [2021-05-02 19:06:54,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2021-05-02 19:06:54,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 228. [2021-05-02 19:06:54,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 224 states have (on average 1.1383928571428572) internal successors, (255), 224 states have internal predecessors, (255), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:54,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 258 transitions. [2021-05-02 19:06:54,777 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 258 transitions. Word has length 105 [2021-05-02 19:06:54,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:54,777 INFO L480 AbstractCegarLoop]: Abstraction has 228 states and 258 transitions. [2021-05-02 19:06:54,778 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 5.0) internal successors, (45), 8 states have internal predecessors, (45), 1 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 19:06:54,778 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 258 transitions. [2021-05-02 19:06:54,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2021-05-02 19:06:54,784 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:54,784 INFO L523 BasicCegarLoop]: trace histogram [64, 64, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:54,999 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:54,999 INFO L428 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:55,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:55,000 INFO L82 PathProgramCache]: Analyzing trace with hash 1861873022, now seen corresponding path program 5 times [2021-05-02 19:06:55,000 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:55,000 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135525756] [2021-05-02 19:06:55,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:55,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:55,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:55,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:55,123 INFO L134 CoverageAnalysis]: Checked inductivity of 5691 backedges. 656 proven. 16 refuted. 0 times theorem prover too weak. 5019 trivial. 0 not checked. [2021-05-02 19:06:55,123 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:55,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135525756] [2021-05-02 19:06:55,124 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135525756] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:55,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373277930] [2021-05-02 19:06:55,124 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 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 19:06:55,164 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 19:06:55,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:55,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 19:06:55,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:55,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:55,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:55,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:55,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:55,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:55,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:55,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:55,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:55,412 INFO L134 CoverageAnalysis]: Checked inductivity of 5691 backedges. 2643 proven. 16 refuted. 0 times theorem prover too weak. 3032 trivial. 0 not checked. [2021-05-02 19:06:55,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1373277930] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:55,413 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:55,413 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 19:06:55,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593136549] [2021-05-02 19:06:55,413 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:06:55,413 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:55,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:06:55,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:06:55,414 INFO L87 Difference]: Start difference. First operand 228 states and 258 transitions. Second operand has 9 states, 9 states have (on average 5.111111111111111) internal successors, (46), 8 states have internal predecessors, (46), 1 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 19:06:55,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:55,547 INFO L93 Difference]: Finished difference Result 276 states and 306 transitions. [2021-05-02 19:06:55,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 19:06:55,547 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.111111111111111) internal successors, (46), 8 states have internal predecessors, (46), 1 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 227 [2021-05-02 19:06:55,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:55,548 INFO L225 Difference]: With dead ends: 276 [2021-05-02 19:06:55,548 INFO L226 Difference]: Without dead ends: 276 [2021-05-02 19:06:55,549 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 228 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 141.7ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:06:55,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-05-02 19:06:55,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 260. [2021-05-02 19:06:55,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 256 states have (on average 1.12109375) internal successors, (287), 256 states have internal predecessors, (287), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:55,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 290 transitions. [2021-05-02 19:06:55,556 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 290 transitions. Word has length 227 [2021-05-02 19:06:55,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:55,557 INFO L480 AbstractCegarLoop]: Abstraction has 260 states and 290 transitions. [2021-05-02 19:06:55,557 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 5.111111111111111) internal successors, (46), 8 states have internal predecessors, (46), 1 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 19:06:55,557 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 290 transitions. [2021-05-02 19:06:55,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 260 [2021-05-02 19:06:55,559 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:55,559 INFO L523 BasicCegarLoop]: trace histogram [80, 80, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:55,774 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 19:06:55,775 INFO L428 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:55,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:55,775 INFO L82 PathProgramCache]: Analyzing trace with hash -505982594, now seen corresponding path program 6 times [2021-05-02 19:06:55,775 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:55,775 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1816930801] [2021-05-02 19:06:55,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:55,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:55,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:55,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:55,855 INFO L134 CoverageAnalysis]: Checked inductivity of 8235 backedges. 956 proven. 25 refuted. 0 times theorem prover too weak. 7254 trivial. 0 not checked. [2021-05-02 19:06:55,855 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:55,855 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1816930801] [2021-05-02 19:06:55,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1816930801] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:55,855 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1274910427] [2021-05-02 19:06:55,855 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 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 19:06:55,975 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 24 check-sat command(s) [2021-05-02 19:06:55,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:55,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 19:06:55,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:56,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:56,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:56,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:56,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:56,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:56,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:56,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:56,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:56,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:56,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:56,245 INFO L134 CoverageAnalysis]: Checked inductivity of 8235 backedges. 3823 proven. 25 refuted. 0 times theorem prover too weak. 4387 trivial. 0 not checked. [2021-05-02 19:06:56,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1274910427] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:56,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:56,245 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 19:06:56,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584686761] [2021-05-02 19:06:56,246 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 19:06:56,246 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:56,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 19:06:56,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:06:56,246 INFO L87 Difference]: Start difference. First operand 260 states and 290 transitions. Second operand has 10 states, 10 states have (on average 4.8) internal successors, (48), 9 states have internal predecessors, (48), 1 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 19:06:56,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:56,403 INFO L93 Difference]: Finished difference Result 292 states and 322 transitions. [2021-05-02 19:06:56,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:06:56,404 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.8) internal successors, (48), 9 states have internal predecessors, (48), 1 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 259 [2021-05-02 19:06:56,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:56,405 INFO L225 Difference]: With dead ends: 292 [2021-05-02 19:06:56,405 INFO L226 Difference]: Without dead ends: 292 [2021-05-02 19:06:56,405 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 260 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 133.9ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 19:06:56,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-05-02 19:06:56,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 292. [2021-05-02 19:06:56,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 288 states have (on average 1.1076388888888888) internal successors, (319), 288 states have internal predecessors, (319), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:56,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 322 transitions. [2021-05-02 19:06:56,411 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 322 transitions. Word has length 259 [2021-05-02 19:06:56,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:56,411 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 322 transitions. [2021-05-02 19:06:56,411 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 4.8) internal successors, (48), 9 states have internal predecessors, (48), 1 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 19:06:56,411 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 322 transitions. [2021-05-02 19:06:56,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2021-05-02 19:06:56,413 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:56,413 INFO L523 BasicCegarLoop]: trace histogram [96, 96, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:56,628 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:56,629 INFO L428 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:56,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:56,629 INFO L82 PathProgramCache]: Analyzing trace with hash 368096638, now seen corresponding path program 7 times [2021-05-02 19:06:56,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:56,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371358658] [2021-05-02 19:06:56,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:56,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:56,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:56,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:56,691 INFO L134 CoverageAnalysis]: Checked inductivity of 11291 backedges. 2489 proven. 89 refuted. 0 times theorem prover too weak. 8713 trivial. 0 not checked. [2021-05-02 19:06:56,691 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:56,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371358658] [2021-05-02 19:06:56,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1371358658] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:56,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [224626470] [2021-05-02 19:06:56,691 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 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 19:06:56,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:56,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 554 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 19:06:56,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:56,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:56,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:56,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:56,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:57,060 INFO L134 CoverageAnalysis]: Checked inductivity of 11291 backedges. 2489 proven. 89 refuted. 0 times theorem prover too weak. 8713 trivial. 0 not checked. [2021-05-02 19:06:57,061 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [224626470] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:57,061 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:57,061 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 19:06:57,061 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725730086] [2021-05-02 19:06:57,061 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 19:06:57,062 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:57,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 19:06:57,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 19:06:57,062 INFO L87 Difference]: Start difference. First operand 292 states and 322 transitions. Second operand has 7 states, 7 states have (on average 5.857142857142857) internal successors, (41), 6 states have internal predecessors, (41), 1 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 19:06:57,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:57,150 INFO L93 Difference]: Finished difference Result 524 states and 570 transitions. [2021-05-02 19:06:57,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 19:06:57,151 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.857142857142857) internal successors, (41), 6 states have internal predecessors, (41), 1 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 291 [2021-05-02 19:06:57,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:57,152 INFO L225 Difference]: With dead ends: 524 [2021-05-02 19:06:57,152 INFO L226 Difference]: Without dead ends: 524 [2021-05-02 19:06:57,153 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 68.3ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:06:57,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 524 states. [2021-05-02 19:06:57,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 524 to 412. [2021-05-02 19:06:57,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 412 states, 408 states have (on average 1.0955882352941178) internal successors, (447), 408 states have internal predecessors, (447), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:57,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 450 transitions. [2021-05-02 19:06:57,158 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 450 transitions. Word has length 291 [2021-05-02 19:06:57,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:57,159 INFO L480 AbstractCegarLoop]: Abstraction has 412 states and 450 transitions. [2021-05-02 19:06:57,159 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 5.857142857142857) internal successors, (41), 6 states have internal predecessors, (41), 1 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 19:06:57,159 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 450 transitions. [2021-05-02 19:06:57,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 412 [2021-05-02 19:06:57,162 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:57,163 INFO L523 BasicCegarLoop]: trace histogram [144, 144, 24, 24, 24, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:57,365 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:57,365 INFO L428 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:57,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:57,366 INFO L82 PathProgramCache]: Analyzing trace with hash 2075432062, now seen corresponding path program 8 times [2021-05-02 19:06:57,366 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:57,366 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1866429231] [2021-05-02 19:06:57,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:57,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:57,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:57,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:57,465 INFO L134 CoverageAnalysis]: Checked inductivity of 25215 backedges. 5548 proven. 264 refuted. 0 times theorem prover too weak. 19403 trivial. 0 not checked. [2021-05-02 19:06:57,465 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:57,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1866429231] [2021-05-02 19:06:57,465 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1866429231] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:57,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [508779474] [2021-05-02 19:06:57,465 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 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 19:06:57,573 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:06:57,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:57,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 746 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 19:06:57,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:57,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:57,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:57,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:57,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:57,638 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:57,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:57,895 INFO L134 CoverageAnalysis]: Checked inductivity of 25215 backedges. 5548 proven. 264 refuted. 0 times theorem prover too weak. 19403 trivial. 0 not checked. [2021-05-02 19:06:57,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [508779474] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:57,895 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:57,896 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 19:06:57,896 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513013108] [2021-05-02 19:06:57,896 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:06:57,896 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:57,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:06:57,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:06:57,897 INFO L87 Difference]: Start difference. First operand 412 states and 450 transitions. Second operand has 8 states, 8 states have (on average 5.75) internal successors, (46), 7 states have internal predecessors, (46), 1 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 19:06:58,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:58,020 INFO L93 Difference]: Finished difference Result 644 states and 698 transitions. [2021-05-02 19:06:58,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 19:06:58,020 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.75) internal successors, (46), 7 states have internal predecessors, (46), 1 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 411 [2021-05-02 19:06:58,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:58,022 INFO L225 Difference]: With dead ends: 644 [2021-05-02 19:06:58,022 INFO L226 Difference]: Without dead ends: 644 [2021-05-02 19:06:58,022 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 412 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 94.5ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:06:58,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2021-05-02 19:06:58,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 532. [2021-05-02 19:06:58,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 528 states have (on average 1.0890151515151516) internal successors, (575), 528 states have internal predecessors, (575), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:58,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 578 transitions. [2021-05-02 19:06:58,030 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 578 transitions. Word has length 411 [2021-05-02 19:06:58,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:58,030 INFO L480 AbstractCegarLoop]: Abstraction has 532 states and 578 transitions. [2021-05-02 19:06:58,031 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 5.75) internal successors, (46), 7 states have internal predecessors, (46), 1 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 19:06:58,031 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 578 transitions. [2021-05-02 19:06:58,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 532 [2021-05-02 19:06:58,036 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:58,036 INFO L523 BasicCegarLoop]: trace histogram [192, 192, 32, 32, 32, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:58,253 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 19:06:58,253 INFO L428 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:58,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:58,254 INFO L82 PathProgramCache]: Analyzing trace with hash -1299733634, now seen corresponding path program 9 times [2021-05-02 19:06:58,254 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:58,254 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1006592738] [2021-05-02 19:06:58,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:58,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:58,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:58,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:58,379 INFO L134 CoverageAnalysis]: Checked inductivity of 44707 backedges. 9825 proven. 526 refuted. 0 times theorem prover too weak. 34356 trivial. 0 not checked. [2021-05-02 19:06:58,379 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:58,379 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1006592738] [2021-05-02 19:06:58,379 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1006592738] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:58,379 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1936317766] [2021-05-02 19:06:58,379 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 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 19:06:58,473 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2021-05-02 19:06:58,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:58,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 19:06:58,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:58,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:58,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:58,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:58,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:58,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:58,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:58,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:58,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:58,996 INFO L134 CoverageAnalysis]: Checked inductivity of 44707 backedges. 9836 proven. 526 refuted. 0 times theorem prover too weak. 34345 trivial. 0 not checked. [2021-05-02 19:06:58,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1936317766] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:58,996 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:58,997 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 19:06:58,997 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739313838] [2021-05-02 19:06:58,997 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:06:58,997 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:58,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:06:58,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:06:58,998 INFO L87 Difference]: Start difference. First operand 532 states and 578 transitions. Second operand has 9 states, 9 states have (on average 7.0) internal successors, (63), 8 states have internal predecessors, (63), 1 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 19:06:59,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:59,152 INFO L93 Difference]: Finished difference Result 764 states and 826 transitions. [2021-05-02 19:06:59,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 19:06:59,152 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 7.0) internal successors, (63), 8 states have internal predecessors, (63), 1 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 531 [2021-05-02 19:06:59,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:59,154 INFO L225 Difference]: With dead ends: 764 [2021-05-02 19:06:59,155 INFO L226 Difference]: Without dead ends: 764 [2021-05-02 19:06:59,155 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 544 GetRequests, 532 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 121.1ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:06:59,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 764 states. [2021-05-02 19:06:59,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 764 to 652. [2021-05-02 19:06:59,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 652 states, 648 states have (on average 1.0848765432098766) internal successors, (703), 648 states have internal predecessors, (703), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:59,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 652 states to 652 states and 706 transitions. [2021-05-02 19:06:59,167 INFO L78 Accepts]: Start accepts. Automaton has 652 states and 706 transitions. Word has length 531 [2021-05-02 19:06:59,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:59,167 INFO L480 AbstractCegarLoop]: Abstraction has 652 states and 706 transitions. [2021-05-02 19:06:59,167 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 7.0) internal successors, (63), 8 states have internal predecessors, (63), 1 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 19:06:59,167 INFO L276 IsEmpty]: Start isEmpty. Operand 652 states and 706 transitions. [2021-05-02 19:06:59,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 652 [2021-05-02 19:06:59,171 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:59,171 INFO L523 BasicCegarLoop]: trace histogram [240, 240, 40, 40, 40, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:59,384 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 19:06:59,385 INFO L428 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:59,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:59,385 INFO L82 PathProgramCache]: Analyzing trace with hash -136093058, now seen corresponding path program 10 times [2021-05-02 19:06:59,385 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:59,385 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300849104] [2021-05-02 19:06:59,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:59,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:59,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:59,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:59,583 INFO L134 CoverageAnalysis]: Checked inductivity of 69767 backedges. 15320 proven. 875 refuted. 0 times theorem prover too weak. 53572 trivial. 0 not checked. [2021-05-02 19:06:59,583 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:59,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [300849104] [2021-05-02 19:06:59,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [300849104] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:59,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1042491788] [2021-05-02 19:06:59,583 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 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 19:06:59,760 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 19:06:59,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:59,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 1101 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 19:06:59,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:59,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:59,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:59,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:59,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:59,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:59,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:59,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:59,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:59,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:59,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:00,271 INFO L134 CoverageAnalysis]: Checked inductivity of 69767 backedges. 15320 proven. 875 refuted. 0 times theorem prover too weak. 53572 trivial. 0 not checked. [2021-05-02 19:07:00,271 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1042491788] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:00,271 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:00,271 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 19:07:00,271 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889457250] [2021-05-02 19:07:00,272 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 19:07:00,272 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:00,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 19:07:00,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:07:00,273 INFO L87 Difference]: Start difference. First operand 652 states and 706 transitions. Second operand has 10 states, 10 states have (on average 5.6) internal successors, (56), 9 states have internal predecessors, (56), 1 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 19:07:00,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:00,437 INFO L93 Difference]: Finished difference Result 772 states and 834 transitions. [2021-05-02 19:07:00,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:07:00,438 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 5.6) internal successors, (56), 9 states have internal predecessors, (56), 1 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 651 [2021-05-02 19:07:00,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:00,439 INFO L225 Difference]: With dead ends: 772 [2021-05-02 19:07:00,440 INFO L226 Difference]: Without dead ends: 772 [2021-05-02 19:07:00,440 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 666 GetRequests, 652 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 177.0ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 19:07:00,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 772 states. [2021-05-02 19:07:00,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 772 to 772. [2021-05-02 19:07:00,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 772 states, 768 states have (on average 1.08203125) internal successors, (831), 768 states have internal predecessors, (831), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:00,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 772 states to 772 states and 834 transitions. [2021-05-02 19:07:00,449 INFO L78 Accepts]: Start accepts. Automaton has 772 states and 834 transitions. Word has length 651 [2021-05-02 19:07:00,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:00,449 INFO L480 AbstractCegarLoop]: Abstraction has 772 states and 834 transitions. [2021-05-02 19:07:00,449 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 5.6) internal successors, (56), 9 states have internal predecessors, (56), 1 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 19:07:00,449 INFO L276 IsEmpty]: Start isEmpty. Operand 772 states and 834 transitions. [2021-05-02 19:07:00,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 772 [2021-05-02 19:07:00,454 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:00,454 INFO L523 BasicCegarLoop]: trace histogram [288, 288, 48, 48, 48, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:00,660 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 19:07:00,661 INFO L428 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:00,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:00,661 INFO L82 PathProgramCache]: Analyzing trace with hash 1299026302, now seen corresponding path program 11 times [2021-05-02 19:07:00,662 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:00,662 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359869262] [2021-05-02 19:07:00,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:00,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:00,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:00,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:00,895 INFO L134 CoverageAnalysis]: Checked inductivity of 100395 backedges. 37786 proven. 3149 refuted. 0 times theorem prover too weak. 59460 trivial. 0 not checked. [2021-05-02 19:07:00,895 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:00,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359869262] [2021-05-02 19:07:00,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [359869262] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:00,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282329073] [2021-05-02 19:07:00,895 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 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 19:07:01,034 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 83 check-sat command(s) [2021-05-02 19:07:01,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:07:01,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 19:07:01,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:01,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:01,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:01,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:01,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:01,788 INFO L134 CoverageAnalysis]: Checked inductivity of 100395 backedges. 62978 proven. 3149 refuted. 0 times theorem prover too weak. 34268 trivial. 0 not checked. [2021-05-02 19:07:01,789 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282329073] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:01,789 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:01,789 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 19:07:01,789 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278251086] [2021-05-02 19:07:01,793 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 19:07:01,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:01,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 19:07:01,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 19:07:01,794 INFO L87 Difference]: Start difference. First operand 772 states and 834 transitions. Second operand has 7 states, 7 states have (on average 8.571428571428571) internal successors, (60), 6 states have internal predecessors, (60), 1 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 19:07:01,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:01,904 INFO L93 Difference]: Finished difference Result 1512 states and 1630 transitions. [2021-05-02 19:07:01,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 19:07:01,905 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 8.571428571428571) internal successors, (60), 6 states have internal predecessors, (60), 1 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 771 [2021-05-02 19:07:01,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:01,908 INFO L225 Difference]: With dead ends: 1512 [2021-05-02 19:07:01,908 INFO L226 Difference]: Without dead ends: 1512 [2021-05-02 19:07:01,909 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 780 GetRequests, 772 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 82.4ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:07:01,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1512 states. [2021-05-02 19:07:01,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1512 to 1144. [2021-05-02 19:07:01,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1144 states, 1140 states have (on average 1.0798245614035087) internal successors, (1231), 1140 states have internal predecessors, (1231), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:01,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1144 states to 1144 states and 1234 transitions. [2021-05-02 19:07:01,922 INFO L78 Accepts]: Start accepts. Automaton has 1144 states and 1234 transitions. Word has length 771 [2021-05-02 19:07:01,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:01,923 INFO L480 AbstractCegarLoop]: Abstraction has 1144 states and 1234 transitions. [2021-05-02 19:07:01,923 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 8.571428571428571) internal successors, (60), 6 states have internal predecessors, (60), 1 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 19:07:01,923 INFO L276 IsEmpty]: Start isEmpty. Operand 1144 states and 1234 transitions. [2021-05-02 19:07:01,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1144 [2021-05-02 19:07:01,932 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:01,932 INFO L523 BasicCegarLoop]: trace histogram [432, 432, 72, 72, 72, 12, 12, 12, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:02,151 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 19:07:02,152 INFO L428 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:02,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:02,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1326053118, now seen corresponding path program 12 times [2021-05-02 19:07:02,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:02,153 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735308824] [2021-05-02 19:07:02,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:02,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:02,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:02,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:02,524 INFO L134 CoverageAnalysis]: Checked inductivity of 226105 backedges. 84997 proven. 9444 refuted. 0 times theorem prover too weak. 131664 trivial. 0 not checked. [2021-05-02 19:07:02,525 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:02,525 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735308824] [2021-05-02 19:07:02,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1735308824] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:02,525 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1735604532] [2021-05-02 19:07:02,525 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 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 19:07:03,004 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 193 check-sat command(s) [2021-05-02 19:07:03,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:07:03,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 1031 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 19:07:03,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:03,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:03,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:04,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:04,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:04,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:04,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:04,117 INFO L134 CoverageAnalysis]: Checked inductivity of 226105 backedges. 85001 proven. 9444 refuted. 0 times theorem prover too weak. 131660 trivial. 0 not checked. [2021-05-02 19:07:04,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1735604532] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:04,118 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:04,118 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 19:07:04,118 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171096079] [2021-05-02 19:07:04,119 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:07:04,119 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:04,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:07:04,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:07:04,120 INFO L87 Difference]: Start difference. First operand 1144 states and 1234 transitions. Second operand has 8 states, 8 states have (on average 8.75) internal successors, (70), 7 states have internal predecessors, (70), 1 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 19:07:04,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:04,271 INFO L93 Difference]: Finished difference Result 1884 states and 2030 transitions. [2021-05-02 19:07:04,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 19:07:04,271 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 8.75) internal successors, (70), 7 states have internal predecessors, (70), 1 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 1143 [2021-05-02 19:07:04,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:04,275 INFO L225 Difference]: With dead ends: 1884 [2021-05-02 19:07:04,276 INFO L226 Difference]: Without dead ends: 1884 [2021-05-02 19:07:04,276 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 1154 GetRequests, 1144 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 99.9ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:07:04,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1884 states. [2021-05-02 19:07:04,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1884 to 1516. [2021-05-02 19:07:04,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1516 states, 1512 states have (on average 1.0787037037037037) internal successors, (1631), 1512 states have internal predecessors, (1631), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:04,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1516 states to 1516 states and 1634 transitions. [2021-05-02 19:07:04,294 INFO L78 Accepts]: Start accepts. Automaton has 1516 states and 1634 transitions. Word has length 1143 [2021-05-02 19:07:04,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:04,294 INFO L480 AbstractCegarLoop]: Abstraction has 1516 states and 1634 transitions. [2021-05-02 19:07:04,294 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 8.75) internal successors, (70), 7 states have internal predecessors, (70), 1 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 19:07:04,295 INFO L276 IsEmpty]: Start isEmpty. Operand 1516 states and 1634 transitions. [2021-05-02 19:07:04,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1516 [2021-05-02 19:07:04,310 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:04,311 INFO L523 BasicCegarLoop]: trace histogram [576, 576, 96, 96, 96, 16, 16, 16, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:04,525 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 19:07:04,526 INFO L428 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:04,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:04,526 INFO L82 PathProgramCache]: Analyzing trace with hash 413615742, now seen corresponding path program 13 times [2021-05-02 19:07:04,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:04,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1790291281] [2021-05-02 19:07:04,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:04,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:04,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:04,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:04,975 INFO L134 CoverageAnalysis]: Checked inductivity of 402167 backedges. 151090 proven. 18886 refuted. 0 times theorem prover too weak. 232191 trivial. 0 not checked. [2021-05-02 19:07:04,975 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:04,976 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1790291281] [2021-05-02 19:07:04,976 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1790291281] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:04,976 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217305396] [2021-05-02 19:07:04,976 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 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 19:07:05,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:05,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 2522 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 19:07:05,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:05,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:05,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:05,505 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:05,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:05,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:05,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:05,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:05,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:06,525 INFO L134 CoverageAnalysis]: Checked inductivity of 402167 backedges. 151090 proven. 18886 refuted. 0 times theorem prover too weak. 232191 trivial. 0 not checked. [2021-05-02 19:07:06,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217305396] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:06,525 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:06,526 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 19:07:06,526 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324084038] [2021-05-02 19:07:06,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:07:06,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:06,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:07:06,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:07:06,528 INFO L87 Difference]: Start difference. First operand 1516 states and 1634 transitions. Second operand has 9 states, 9 states have (on average 7.222222222222222) internal successors, (65), 8 states have internal predecessors, (65), 1 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 19:07:06,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:06,680 INFO L93 Difference]: Finished difference Result 2256 states and 2430 transitions. [2021-05-02 19:07:06,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 19:07:06,680 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 7.222222222222222) internal successors, (65), 8 states have internal predecessors, (65), 1 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 1515 [2021-05-02 19:07:06,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:06,685 INFO L225 Difference]: With dead ends: 2256 [2021-05-02 19:07:06,685 INFO L226 Difference]: Without dead ends: 2256 [2021-05-02 19:07:06,686 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 1528 GetRequests, 1516 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 120.9ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:07:06,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2256 states. [2021-05-02 19:07:06,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2256 to 1888. [2021-05-02 19:07:06,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1888 states, 1884 states have (on average 1.0780254777070064) internal successors, (2031), 1884 states have internal predecessors, (2031), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:06,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1888 states to 1888 states and 2034 transitions. [2021-05-02 19:07:06,709 INFO L78 Accepts]: Start accepts. Automaton has 1888 states and 2034 transitions. Word has length 1515 [2021-05-02 19:07:06,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:06,710 INFO L480 AbstractCegarLoop]: Abstraction has 1888 states and 2034 transitions. [2021-05-02 19:07:06,710 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 7.222222222222222) internal successors, (65), 8 states have internal predecessors, (65), 1 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 19:07:06,710 INFO L276 IsEmpty]: Start isEmpty. Operand 1888 states and 2034 transitions. [2021-05-02 19:07:06,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1888 [2021-05-02 19:07:06,734 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:06,734 INFO L523 BasicCegarLoop]: trace histogram [720, 720, 120, 120, 120, 20, 20, 20, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:06,949 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:07:06,949 INFO L428 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:06,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:06,950 INFO L82 PathProgramCache]: Analyzing trace with hash 1000902654, now seen corresponding path program 14 times [2021-05-02 19:07:06,950 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:06,950 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075020121] [2021-05-02 19:07:06,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:07,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:07,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:07,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:07,572 INFO L134 CoverageAnalysis]: Checked inductivity of 628581 backedges. 236065 proven. 31475 refuted. 0 times theorem prover too weak. 361041 trivial. 0 not checked. [2021-05-02 19:07:07,573 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:07,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075020121] [2021-05-02 19:07:07,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2075020121] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:07,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1341464236] [2021-05-02 19:07:07,573 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 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 19:07:07,977 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:07:07,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:07:07,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 3122 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 19:07:07,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:08,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:08,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:08,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:08,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:08,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:08,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:08,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:08,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:08,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:08,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:09,450 INFO L134 CoverageAnalysis]: Checked inductivity of 628581 backedges. 236065 proven. 31475 refuted. 0 times theorem prover too weak. 361041 trivial. 0 not checked. [2021-05-02 19:07:09,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1341464236] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:09,450 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:09,450 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 19:07:09,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394835702] [2021-05-02 19:07:09,452 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 19:07:09,452 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:09,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 19:07:09,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:07:09,453 INFO L87 Difference]: Start difference. First operand 1888 states and 2034 transitions. Second operand has 10 states, 10 states have (on average 7.3) internal successors, (73), 9 states have internal predecessors, (73), 1 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 19:07:09,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:09,634 INFO L93 Difference]: Finished difference Result 2260 states and 2434 transitions. [2021-05-02 19:07:09,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:07:09,634 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 7.3) internal successors, (73), 9 states have internal predecessors, (73), 1 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 1887 [2021-05-02 19:07:09,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:09,640 INFO L225 Difference]: With dead ends: 2260 [2021-05-02 19:07:09,640 INFO L226 Difference]: Without dead ends: 2260 [2021-05-02 19:07:09,640 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 1902 GetRequests, 1888 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 149.2ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 19:07:09,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2260 states. [2021-05-02 19:07:09,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2260 to 2260. [2021-05-02 19:07:09,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2260 states, 2256 states have (on average 1.0775709219858156) internal successors, (2431), 2256 states have internal predecessors, (2431), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:09,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2260 states to 2260 states and 2434 transitions. [2021-05-02 19:07:09,664 INFO L78 Accepts]: Start accepts. Automaton has 2260 states and 2434 transitions. Word has length 1887 [2021-05-02 19:07:09,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:09,665 INFO L480 AbstractCegarLoop]: Abstraction has 2260 states and 2434 transitions. [2021-05-02 19:07:09,665 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 7.3) internal successors, (73), 9 states have internal predecessors, (73), 1 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 19:07:09,665 INFO L276 IsEmpty]: Start isEmpty. Operand 2260 states and 2434 transitions. [2021-05-02 19:07:09,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2260 [2021-05-02 19:07:09,698 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:09,698 INFO L523 BasicCegarLoop]: trace histogram [864, 864, 144, 144, 144, 24, 24, 24, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:09,915 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:07:09,915 INFO L428 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:09,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:09,916 INFO L82 PathProgramCache]: Analyzing trace with hash 1019919230, now seen corresponding path program 15 times [2021-05-02 19:07:09,916 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:09,916 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48949031] [2021-05-02 19:07:09,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:10,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:10,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:10,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:10,876 INFO L134 CoverageAnalysis]: Checked inductivity of 905347 backedges. 453235 proven. 113309 refuted. 0 times theorem prover too weak. 338803 trivial. 0 not checked. [2021-05-02 19:07:10,876 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:10,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48949031] [2021-05-02 19:07:10,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [48949031] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:10,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1077478594] [2021-05-02 19:07:10,876 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 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 19:07:12,685 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 377 check-sat command(s) [2021-05-02 19:07:12,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:07:12,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 2387 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 19:07:12,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:14,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:14,995 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:15,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:15,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:15,065 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:15,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:15,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:15,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:15,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:15,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:15,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:15,221 INFO L134 CoverageAnalysis]: Checked inductivity of 905347 backedges. 582727 proven. 0 refuted. 0 times theorem prover too weak. 322620 trivial. 0 not checked. [2021-05-02 19:07:15,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1077478594] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:07:15,221 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:07:15,222 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [6] total 21 [2021-05-02 19:07:15,222 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261700799] [2021-05-02 19:07:15,222 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 19:07:15,223 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:15,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 19:07:15,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-05-02 19:07:15,223 INFO L87 Difference]: Start difference. First operand 2260 states and 2434 transitions. Second operand has 17 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 17 states have internal predecessors, (60), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:15,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:15,277 INFO L93 Difference]: Finished difference Result 2258 states and 2432 transitions. [2021-05-02 19:07:15,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 19:07:15,278 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 17 states have internal predecessors, (60), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 2259 [2021-05-02 19:07:15,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:15,280 INFO L225 Difference]: With dead ends: 2258 [2021-05-02 19:07:15,280 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 19:07:15,280 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 2265 GetRequests, 2246 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 216.8ms TimeCoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-05-02 19:07:15,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 19:07:15,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 19:07:15,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 19:07:15,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 19:07:15,281 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 2259 [2021-05-02 19:07:15,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:15,281 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 19:07:15,281 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 17 states have internal predecessors, (60), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:15,281 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 19:07:15,281 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 19:07:15,497 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 19:07:15,500 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:07:15 BasicIcfg [2021-05-02 19:07:15,500 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 19:07:15,501 INFO L168 Benchmark]: Toolchain (without parser) took 24926.87 ms. Allocated memory was 211.8 MB in the beginning and 1.2 GB in the end (delta: 938.5 MB). Free memory was 177.5 MB in the beginning and 701.5 MB in the end (delta: -524.0 MB). Peak memory consumption was 415.8 MB. Max. memory is 8.0 GB. [2021-05-02 19:07:15,501 INFO L168 Benchmark]: CDTParser took 0.47 ms. Allocated memory is still 211.8 MB. Free memory is still 193.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 19:07:15,501 INFO L168 Benchmark]: CACSL2BoogieTranslator took 193.93 ms. Allocated memory is still 211.8 MB. Free memory was 177.3 MB in the beginning and 167.9 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-02 19:07:15,501 INFO L168 Benchmark]: Boogie Preprocessor took 56.80 ms. Allocated memory is still 211.8 MB. Free memory was 167.9 MB in the beginning and 194.8 MB in the end (delta: -26.9 MB). Peak memory consumption was 5.4 MB. Max. memory is 8.0 GB. [2021-05-02 19:07:15,501 INFO L168 Benchmark]: RCFGBuilder took 338.30 ms. Allocated memory is still 211.8 MB. Free memory was 194.8 MB in the beginning and 180.7 MB in the end (delta: 14.1 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-02 19:07:15,501 INFO L168 Benchmark]: IcfgTransformer took 29.88 ms. Allocated memory is still 211.8 MB. Free memory was 180.7 MB in the beginning and 179.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 19:07:15,501 INFO L168 Benchmark]: TraceAbstraction took 24301.40 ms. Allocated memory was 211.8 MB in the beginning and 1.2 GB in the end (delta: 938.5 MB). Free memory was 178.9 MB in the beginning and 701.5 MB in the end (delta: -522.5 MB). Peak memory consumption was 416.7 MB. Max. memory is 8.0 GB. [2021-05-02 19:07:15,501 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.47 ms. Allocated memory is still 211.8 MB. Free memory is still 193.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 193.93 ms. Allocated memory is still 211.8 MB. Free memory was 177.3 MB in the beginning and 167.9 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 56.80 ms. Allocated memory is still 211.8 MB. Free memory was 167.9 MB in the beginning and 194.8 MB in the end (delta: -26.9 MB). Peak memory consumption was 5.4 MB. Max. memory is 8.0 GB. * RCFGBuilder took 338.30 ms. Allocated memory is still 211.8 MB. Free memory was 194.8 MB in the beginning and 180.7 MB in the end (delta: 14.1 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * IcfgTransformer took 29.88 ms. Allocated memory is still 211.8 MB. Free memory was 180.7 MB in the beginning and 179.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 24301.40 ms. Allocated memory was 211.8 MB in the beginning and 1.2 GB in the end (delta: 938.5 MB). Free memory was 178.9 MB in the beginning and 701.5 MB in the end (delta: -522.5 MB). Peak memory consumption was 416.7 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 35]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 24238.2ms, OverallIterations: 21, TraceHistogramMax: 864, EmptinessCheckTime: 126.9ms, AutomataDifference: 2810.4ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 8.4ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 407 SDtfs, 1128 SDslu, 289 SDs, 0 SdLazy, 1302 SolverSat, 176 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 800.2ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 10363 GetRequests, 10157 SyntacticMatches, 0 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 2472.0ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=2260occurred in iteration=20, InterpolantAutomatonStates: 160, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 172.9ms AutomataMinimizationTime, 21 MinimizatonAttempts, 1728 StatesRemovedByMinimization, 16 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 834.8ms SsaConstructionTime, 4067.4ms SatisfiabilityAnalysisTime, 12214.1ms InterpolantComputationTime, 20352 NumberOfCodeBlocks, 17614 NumberOfCodeBlocksAsserted, 756 NumberOfCheckSat, 20316 ConstructedInterpolants, 0 QuantifiedInterpolants, 34582 SizeOfPredicates, 5 NumberOfNonLiveVariables, 12908 ConjunctsInSsa, 88 ConjunctsInUnsatCore, 36 InterpolantComputations, 7 PerfectInterpolantSequences, 4614108/4856934 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...