/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-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:11:28,627 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:11:28,628 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:11:28,647 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 18:11:28,647 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 18:11:28,648 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 18:11:28,649 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 18:11:28,651 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 18:11:28,652 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 18:11:28,652 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 18:11:28,653 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 18:11:28,654 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 18:11:28,654 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 18:11:28,655 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 18:11:28,655 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 18:11:28,656 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 18:11:28,657 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 18:11:28,657 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 18:11:28,658 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 18:11:28,659 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 18:11:28,660 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 18:11:28,661 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 18:11:28,662 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 18:11:28,662 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 18:11:28,664 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 18:11:28,668 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:11:28,669 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:11:28,669 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:11:28,670 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:11:28,678 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:11:28,678 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:11:28,679 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:11:28,679 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:11:28,679 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:11:28,679 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:11:28,679 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:11:28,679 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:11:28,680 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:11:28,680 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:11:28,680 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:11:28,680 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:11:28,680 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:11:28,680 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:11:28,680 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:11:28,680 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:11:28,680 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:11:28,680 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:11:28,681 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:11:28,681 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:11:28,681 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:11:28,681 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:11:28,682 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:11:28,930 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:11:28,945 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:11:28,947 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:11:28,948 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:11:28,949 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:11:28,949 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2021-05-02 18:11:28,999 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/58c666f7f/406c1ce5f9b84470adcbe92a3c620ece/FLAGaed7766a9 [2021-05-02 18:11:29,387 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:11:29,388 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/ddlm2013.i [2021-05-02 18:11:29,393 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/58c666f7f/406c1ce5f9b84470adcbe92a3c620ece/FLAGaed7766a9 [2021-05-02 18:11:29,410 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/58c666f7f/406c1ce5f9b84470adcbe92a3c620ece [2021-05-02 18:11:29,412 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:11:29,414 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:11:29,418 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:11:29,418 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:11:29,421 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:11:29,421 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:11:29" (1/1) ... [2021-05-02 18:11:29,422 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d8cf53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:11:29, skipping insertion in model container [2021-05-02 18:11:29,422 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:11:29" (1/1) ... [2021-05-02 18:11:29,426 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:11:29,441 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:11:29,570 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-lit/ddlm2013.i[895,908] [2021-05-02 18:11:29,583 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:11:29,590 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:11:29,600 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-lit/ddlm2013.i[895,908] [2021-05-02 18:11:29,609 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:11:29,647 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:11:29,647 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:11:29 WrapperNode [2021-05-02 18:11:29,647 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:11:29,648 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:11:29,648 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:11:29,648 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:11:29,663 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:11:29" (1/1) ... [2021-05-02 18:11:29,664 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:11:29" (1/1) ... [2021-05-02 18:11:29,673 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:11:29" (1/1) ... [2021-05-02 18:11:29,673 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:11:29" (1/1) ... [2021-05-02 18:11:29,682 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:11:29" (1/1) ... [2021-05-02 18:11:29,685 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:11:29" (1/1) ... [2021-05-02 18:11:29,702 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:11:29" (1/1) ... [2021-05-02 18:11:29,705 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:11:29,706 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:11:29,706 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:11:29,707 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:11:29,708 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:11:29" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:11:29,766 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:11:29,766 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:11:29,766 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:11:29,766 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 18:11:29,766 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:11:29,767 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:11:29,767 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:11:29,767 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:11:29,767 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 18:11:29,767 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 18:11:29,767 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:11:29,767 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:11:29,767 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 18:11:29,768 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:11:29,768 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 18:11:29,768 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:11:29,768 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:11:29,768 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:11:29,769 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:11:29,769 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:11:29,769 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:11:29,769 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:11:29,955 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:11:29,955 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 18:11:29,957 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:11:29 BoogieIcfgContainer [2021-05-02 18:11:29,957 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:11:29,957 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:11:29,957 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:11:29,958 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:11:29,960 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:11:29" (1/1) ... [2021-05-02 18:11:29,972 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:11:29 BasicIcfg [2021-05-02 18:11:29,972 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:11:29,973 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:11:29,973 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:11:29,975 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:11:29,975 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:11:29" (1/4) ... [2021-05-02 18:11:29,976 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62104c20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:11:29, skipping insertion in model container [2021-05-02 18:11:29,976 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:11:29" (2/4) ... [2021-05-02 18:11:29,976 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62104c20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:11:29, skipping insertion in model container [2021-05-02 18:11:29,976 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:11:29" (3/4) ... [2021-05-02 18:11:29,977 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62104c20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:11:29, skipping insertion in model container [2021-05-02 18:11:29,977 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:11:29" (4/4) ... [2021-05-02 18:11:29,977 INFO L111 eAbstractionObserver]: Analyzing ICFG ddlm2013.iJordan [2021-05-02 18:11:29,981 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:11:29,984 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:11:29,996 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:11:30,009 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:11:30,009 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:11:30,009 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:11:30,009 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:11:30,009 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:11:30,009 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:11:30,010 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:11:30,010 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:11:30,020 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:11:30,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 18:11:30,024 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:11:30,025 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:11:30,025 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:11:30,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:11:30,029 INFO L82 PathProgramCache]: Analyzing trace with hash -1607486853, now seen corresponding path program 1 times [2021-05-02 18:11:30,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:11:30,035 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249787139] [2021-05-02 18:11:30,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:11:30,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:30,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:11:30,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:30,161 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:11:30,161 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:11:30,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249787139] [2021-05-02 18:11:30,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [249787139] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:11:30,162 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:11:30,162 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 18:11:30,162 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553684742] [2021-05-02 18:11:30,165 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:11:30,165 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:11:30,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:11:30,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:11:30,174 INFO L87 Difference]: Start difference. First operand has 23 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:30,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:11:30,198 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2021-05-02 18:11:30,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:11:30,200 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-02 18:11:30,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:11:30,204 INFO L225 Difference]: With dead ends: 23 [2021-05-02 18:11:30,204 INFO L226 Difference]: Without dead ends: 16 [2021-05-02 18:11:30,205 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 30.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:11:30,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-05-02 18:11:30,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-05-02 18:11:30,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:30,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-05-02 18:11:30,221 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 13 [2021-05-02 18:11:30,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:11:30,221 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-05-02 18:11:30,222 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:30,222 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-05-02 18:11:30,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 18:11:30,222 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:11:30,222 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:11:30,222 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:11:30,222 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:11:30,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:11:30,223 INFO L82 PathProgramCache]: Analyzing trace with hash -1646505343, now seen corresponding path program 1 times [2021-05-02 18:11:30,223 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:11:30,223 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1333709441] [2021-05-02 18:11:30,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:11:30,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:30,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:11:30,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:30,325 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:11:30,326 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:11:30,326 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1333709441] [2021-05-02 18:11:30,326 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1333709441] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:11:30,326 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:11:30,326 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 18:11:30,326 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933134555] [2021-05-02 18:11:30,327 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:11:30,327 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:11:30,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:11:30,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:11:30,329 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:30,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:11:30,444 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-05-02 18:11:30,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:11:30,445 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 18:11:30,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:11:30,446 INFO L225 Difference]: With dead ends: 22 [2021-05-02 18:11:30,447 INFO L226 Difference]: Without dead ends: 18 [2021-05-02 18:11:30,448 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 92.2ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:11:30,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-02 18:11:30,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-05-02 18:11:30,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:30,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-05-02 18:11:30,454 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2021-05-02 18:11:30,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:11:30,454 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-05-02 18:11:30,456 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:30,456 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-05-02 18:11:30,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 18:11:30,458 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:11:30,458 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:11:30,458 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:11:30,459 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:11:30,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:11:30,463 INFO L82 PathProgramCache]: Analyzing trace with hash 1516576148, now seen corresponding path program 1 times [2021-05-02 18:11:30,463 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:11:30,464 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889510191] [2021-05-02 18:11:30,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:11:30,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:30,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:11:30,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:30,818 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:11:30,818 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:11:30,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889510191] [2021-05-02 18:11:30,818 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889510191] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:30,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213799065] [2021-05-02 18:11:30,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:11:30,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:30,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 18:11:30,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:11:31,025 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:11:31,025 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1213799065] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:31,025 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:11:31,025 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 12 [2021-05-02 18:11:31,026 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810544244] [2021-05-02 18:11:31,026 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 18:11:31,026 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:11:31,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 18:11:31,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:11:31,027 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 12 states, 12 states have (on average 1.75) internal successors, (21), 9 states have internal predecessors, (21), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:31,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:11:31,237 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2021-05-02 18:11:31,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 18:11:31,237 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 9 states have internal predecessors, (21), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 18:11:31,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:11:31,238 INFO L225 Difference]: With dead ends: 27 [2021-05-02 18:11:31,238 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 18:11:31,238 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 303.2ms TimeCoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:11:31,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 18:11:31,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2021-05-02 18:11:31,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:31,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2021-05-02 18:11:31,240 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 17 [2021-05-02 18:11:31,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:11:31,241 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2021-05-02 18:11:31,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 9 states have internal predecessors, (21), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:31,241 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2021-05-02 18:11:31,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 18:11:31,241 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:11:31,241 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:11:31,459 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 18:11:31,460 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:11:31,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:11:31,461 INFO L82 PathProgramCache]: Analyzing trace with hash -280375211, now seen corresponding path program 1 times [2021-05-02 18:11:31,461 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:11:31,461 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1379450351] [2021-05-02 18:11:31,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:11:31,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:31,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:11:31,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:31,513 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:11:31,513 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:11:31,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1379450351] [2021-05-02 18:11:31,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1379450351] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:11:31,514 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:11:31,514 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:11:31,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154700436] [2021-05-02 18:11:31,514 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:11:31,514 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:11:31,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:11:31,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:11:31,515 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:31,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:11:31,549 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2021-05-02 18:11:31,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:11:31,549 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 18:11:31,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:11:31,549 INFO L225 Difference]: With dead ends: 27 [2021-05-02 18:11:31,550 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 18:11:31,550 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 18:11:31,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 18:11:31,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-05-02 18:11:31,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:31,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-05-02 18:11:31,552 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 17 [2021-05-02 18:11:31,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:11:31,552 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-05-02 18:11:31,552 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:31,552 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-05-02 18:11:31,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 18:11:31,552 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:11:31,553 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:11:31,553 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 18:11:31,553 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:11:31,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:11:31,553 INFO L82 PathProgramCache]: Analyzing trace with hash 1294800289, now seen corresponding path program 2 times [2021-05-02 18:11:31,553 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:11:31,553 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1706523928] [2021-05-02 18:11:31,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:11:31,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:31,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:11:31,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:31,702 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:11:31,702 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:11:31,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1706523928] [2021-05-02 18:11:31,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1706523928] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:31,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822923193] [2021-05-02 18:11:31,702 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:11:31,739 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:11:31,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:11:31,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 18:11:31,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:11:31,904 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:11:31,905 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1822923193] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:31,905 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:11:31,905 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 15 [2021-05-02 18:11:31,905 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083909422] [2021-05-02 18:11:31,909 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 18:11:31,909 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:11:31,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 18:11:31,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:11:31,910 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 12 states have internal predecessors, (27), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:32,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:11:32,200 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2021-05-02 18:11:32,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:11:32,201 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 12 states have internal predecessors, (27), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 18:11:32,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:11:32,201 INFO L225 Difference]: With dead ends: 28 [2021-05-02 18:11:32,202 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 18:11:32,203 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 372.7ms TimeCoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:11:32,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 18:11:32,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 18:11:32,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:32,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-05-02 18:11:32,205 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 20 [2021-05-02 18:11:32,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:11:32,206 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-05-02 18:11:32,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 12 states have internal predecessors, (27), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:32,206 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-05-02 18:11:32,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 18:11:32,206 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:11:32,206 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:11:32,422 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:11:32,422 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:11:32,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:11:32,423 INFO L82 PathProgramCache]: Analyzing trace with hash 29886068, now seen corresponding path program 3 times [2021-05-02 18:11:32,423 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:11:32,423 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245243358] [2021-05-02 18:11:32,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:11:32,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:32,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:11:32,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:32,593 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:11:32,593 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:11:32,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245243358] [2021-05-02 18:11:32,593 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [245243358] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:32,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1609307046] [2021-05-02 18:11:32,593 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:11:32,672 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 18:11:32,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:11:32,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 18:11:32,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:11:32,828 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:11:32,829 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1609307046] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:32,829 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:11:32,829 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 19 [2021-05-02 18:11:32,829 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836673775] [2021-05-02 18:11:32,829 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 18:11:32,829 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:11:32,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 18:11:32,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-05-02 18:11:32,830 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 19 states, 19 states have (on average 1.736842105263158) internal successors, (33), 16 states have internal predecessors, (33), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:33,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:11:33,327 INFO L93 Difference]: Finished difference Result 45 states and 52 transitions. [2021-05-02 18:11:33,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 18:11:33,328 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.736842105263158) internal successors, (33), 16 states have internal predecessors, (33), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 18:11:33,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:11:33,329 INFO L225 Difference]: With dead ends: 45 [2021-05-02 18:11:33,329 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 18:11:33,331 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 547.1ms TimeCoverageRelationStatistics Valid=160, Invalid=896, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 18:11:33,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 18:11:33,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2021-05-02 18:11:33,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:33,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2021-05-02 18:11:33,341 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 23 [2021-05-02 18:11:33,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:11:33,342 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2021-05-02 18:11:33,342 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.736842105263158) internal successors, (33), 16 states have internal predecessors, (33), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:33,342 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2021-05-02 18:11:33,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 18:11:33,343 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:11:33,343 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:11:33,556 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:11:33,557 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:11:33,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:11:33,557 INFO L82 PathProgramCache]: Analyzing trace with hash -783567998, now seen corresponding path program 1 times [2021-05-02 18:11:33,557 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:11:33,558 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1228774060] [2021-05-02 18:11:33,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:11:33,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:33,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:11:33,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:33,696 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:11:33,696 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:11:33,696 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1228774060] [2021-05-02 18:11:33,696 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1228774060] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:33,696 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1318662437] [2021-05-02 18:11:33,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:11:33,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:33,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 18:11:33,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:11:33,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:11:33,840 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:11:33,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1318662437] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:33,840 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:11:33,840 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 18:11:33,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953404012] [2021-05-02 18:11:33,841 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 18:11:33,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:11:33,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 18:11:33,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:11:33,841 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:33,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:11:33,981 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2021-05-02 18:11:33,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:11:33,982 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 18:11:33,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:11:33,982 INFO L225 Difference]: With dead ends: 33 [2021-05-02 18:11:33,982 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 18:11:33,982 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 122.0ms TimeCoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2021-05-02 18:11:33,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 18:11:33,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-02 18:11:33,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:33,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2021-05-02 18:11:33,984 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 26 [2021-05-02 18:11:33,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:11:33,984 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2021-05-02 18:11:33,985 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:33,985 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2021-05-02 18:11:33,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 18:11:33,985 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:11:33,985 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:11:34,200 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:11:34,200 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:11:34,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:11:34,201 INFO L82 PathProgramCache]: Analyzing trace with hash 302781409, now seen corresponding path program 4 times [2021-05-02 18:11:34,201 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:11:34,201 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016394824] [2021-05-02 18:11:34,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:11:34,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:34,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:11:34,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:34,534 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:11:34,534 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:11:34,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016394824] [2021-05-02 18:11:34,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016394824] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:34,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327910442] [2021-05-02 18:11:34,534 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:11:34,625 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:11:34,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:11:34,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 18:11:34,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:11:34,971 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:11:34,972 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327910442] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:34,972 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:11:34,972 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 31 [2021-05-02 18:11:34,972 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589774072] [2021-05-02 18:11:34,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 18:11:34,973 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:11:34,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 18:11:34,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=804, Unknown=0, NotChecked=0, Total=930 [2021-05-02 18:11:34,973 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand has 31 states, 31 states have (on average 1.6451612903225807) internal successors, (51), 28 states have internal predecessors, (51), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:35,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:11:35,942 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2021-05-02 18:11:35,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 18:11:35,943 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.6451612903225807) internal successors, (51), 28 states have internal predecessors, (51), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 18:11:35,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:11:35,943 INFO L225 Difference]: With dead ends: 36 [2021-05-02 18:11:35,943 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 18:11:35,944 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 509 ImplicationChecksByTransitivity, 1247.9ms TimeCoverageRelationStatistics Valid=301, Invalid=2051, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 18:11:35,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 18:11:35,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 18:11:35,944 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 18:11:35,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 18:11:35,944 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 32 [2021-05-02 18:11:35,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:11:35,944 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 18:11:35,944 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.6451612903225807) internal successors, (51), 28 states have internal predecessors, (51), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:35,944 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 18:11:35,945 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 18:11:36,160 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:11:36,164 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:11:36 BasicIcfg [2021-05-02 18:11:36,164 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 18:11:36,164 INFO L168 Benchmark]: Toolchain (without parser) took 6750.01 ms. Allocated memory was 220.2 MB in the beginning and 318.8 MB in the end (delta: 98.6 MB). Free memory was 186.1 MB in the beginning and 150.7 MB in the end (delta: 35.4 MB). Peak memory consumption was 135.0 MB. Max. memory is 8.0 GB. [2021-05-02 18:11:36,164 INFO L168 Benchmark]: CDTParser took 0.14 ms. Allocated memory is still 220.2 MB. Free memory was 202.4 MB in the beginning and 202.2 MB in the end (delta: 103.2 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 18:11:36,165 INFO L168 Benchmark]: CACSL2BoogieTranslator took 230.10 ms. Allocated memory is still 220.2 MB. Free memory was 185.9 MB in the beginning and 204.2 MB in the end (delta: -18.3 MB). Peak memory consumption was 13.2 MB. Max. memory is 8.0 GB. [2021-05-02 18:11:36,165 INFO L168 Benchmark]: Boogie Preprocessor took 56.96 ms. Allocated memory is still 220.2 MB. Free memory was 204.2 MB in the beginning and 203.5 MB in the end (delta: 697.4 kB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 18:11:36,165 INFO L168 Benchmark]: RCFGBuilder took 250.44 ms. Allocated memory is still 220.2 MB. Free memory was 203.5 MB in the beginning and 187.8 MB in the end (delta: 15.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-02 18:11:36,165 INFO L168 Benchmark]: IcfgTransformer took 14.76 ms. Allocated memory is still 220.2 MB. Free memory was 187.8 MB in the beginning and 186.7 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 18:11:36,165 INFO L168 Benchmark]: TraceAbstraction took 6190.93 ms. Allocated memory was 220.2 MB in the beginning and 318.8 MB in the end (delta: 98.6 MB). Free memory was 186.2 MB in the beginning and 150.7 MB in the end (delta: 35.5 MB). Peak memory consumption was 134.7 MB. Max. memory is 8.0 GB. [2021-05-02 18:11:36,165 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 ms. Allocated memory is still 220.2 MB. Free memory was 202.4 MB in the beginning and 202.2 MB in the end (delta: 103.2 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 230.10 ms. Allocated memory is still 220.2 MB. Free memory was 185.9 MB in the beginning and 204.2 MB in the end (delta: -18.3 MB). Peak memory consumption was 13.2 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 56.96 ms. Allocated memory is still 220.2 MB. Free memory was 204.2 MB in the beginning and 203.5 MB in the end (delta: 697.4 kB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 250.44 ms. Allocated memory is still 220.2 MB. Free memory was 203.5 MB in the beginning and 187.8 MB in the end (delta: 15.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * IcfgTransformer took 14.76 ms. Allocated memory is still 220.2 MB. Free memory was 187.8 MB in the beginning and 186.7 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 6190.93 ms. Allocated memory was 220.2 MB in the beginning and 318.8 MB in the end (delta: 98.6 MB). Free memory was 186.2 MB in the beginning and 150.7 MB in the end (delta: 35.5 MB). Peak memory consumption was 134.7 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 19]: 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 4 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 6153.8ms, OverallIterations: 8, TraceHistogramMax: 7, EmptinessCheckTime: 11.9ms, AutomataDifference: 2311.2ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 7.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 137 SDtfs, 193 SDslu, 299 SDs, 0 SdLazy, 1106 SolverSat, 98 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 532.2ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 245 GetRequests, 107 SyntacticMatches, 2 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 902 ImplicationChecksByTransitivity, 2743.4ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=33occurred in iteration=6, InterpolantAutomatonStates: 78, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 33.4ms AutomataMinimizationTime, 8 MinimizatonAttempts, 4 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 93.2ms SsaConstructionTime, 268.2ms SatisfiabilityAnalysisTime, 2037.4ms InterpolantComputationTime, 280 NumberOfCodeBlocks, 280 NumberOfCodeBlocksAsserted, 18 NumberOfCheckSat, 267 ConstructedInterpolants, 0 QuantifiedInterpolants, 2597 SizeOfPredicates, 9 NumberOfNonLiveVariables, 637 ConjunctsInSsa, 145 ConjunctsInUnsatCore, 13 InterpolantComputations, 3 PerfectInterpolantSequences, 36/216 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...