/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-new/half.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:22:36,254 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:22:36,256 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:22:36,284 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 18:22:36,325 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:22:36,326 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:22:36,326 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:22:36,327 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:22:36,339 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:22:36,339 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:22:36,341 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:22:36,341 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:22:36,342 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:22:36,342 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:22:36,342 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:22:36,342 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:22:36,342 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:22:36,342 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:22:36,343 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:22:36,343 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:22:36,343 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:22:36,343 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:22:36,343 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:22:36,343 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:22:36,344 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:22:36,344 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:22:36,344 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:22:36,344 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:22:36,344 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:22:36,345 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:22:36,345 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:22:36,576 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:22:36,597 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:22:36,599 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:22:36,600 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:22:36,600 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:22:36,601 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/half.i [2021-05-02 18:22:36,648 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8793e7f51/a4403468dd264129a4cd909abc4297a2/FLAG487d22796 [2021-05-02 18:22:36,968 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:22:36,968 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/half.i [2021-05-02 18:22:36,972 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8793e7f51/a4403468dd264129a4cd909abc4297a2/FLAG487d22796 [2021-05-02 18:22:37,403 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8793e7f51/a4403468dd264129a4cd909abc4297a2 [2021-05-02 18:22:37,405 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:22:37,406 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:22:37,410 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:22:37,410 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:22:37,413 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:22:37,413 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:22:37" (1/1) ... [2021-05-02 18:22:37,414 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12a52cd7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:37, skipping insertion in model container [2021-05-02 18:22:37,414 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:22:37" (1/1) ... [2021-05-02 18:22:37,418 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:22:37,429 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:22:37,510 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-new/half.i[891,904] [2021-05-02 18:22:37,518 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:22:37,524 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:22:37,551 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-new/half.i[891,904] [2021-05-02 18:22:37,559 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:22:37,574 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:22:37,575 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:37 WrapperNode [2021-05-02 18:22:37,575 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:22:37,575 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:22:37,576 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:22:37,576 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:22:37,582 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:37" (1/1) ... [2021-05-02 18:22:37,582 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:37" (1/1) ... [2021-05-02 18:22:37,586 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:37" (1/1) ... [2021-05-02 18:22:37,586 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:37" (1/1) ... [2021-05-02 18:22:37,589 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:37" (1/1) ... [2021-05-02 18:22:37,591 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:37" (1/1) ... [2021-05-02 18:22:37,592 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:37" (1/1) ... [2021-05-02 18:22:37,593 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:22:37,594 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:22:37,594 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:22:37,594 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:22:37,594 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:37" (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 18:22:37,669 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:22:37,669 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:22:37,669 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:22:37,669 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 18:22:37,670 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:22:37,670 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:22:37,670 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:22:37,670 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:22:37,670 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 18:22:37,670 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 18:22:37,670 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:22:37,670 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:22:37,670 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 18:22:37,670 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:22:37,670 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 18:22:37,670 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:22:37,671 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:22:37,671 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:22:37,671 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:22:37,671 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:22:37,671 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:22:37,671 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:22:37,805 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:22:37,806 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 18:22:37,806 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:22:37 BoogieIcfgContainer [2021-05-02 18:22:37,807 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:22:37,807 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:22:37,807 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:22:37,808 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:22:37,810 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:22:37" (1/1) ... [2021-05-02 18:22:37,821 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:22:37 BasicIcfg [2021-05-02 18:22:37,821 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:22:37,822 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:22:37,822 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:22:37,824 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:22:37,824 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:22:37" (1/4) ... [2021-05-02 18:22:37,825 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@571475f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:22:37, skipping insertion in model container [2021-05-02 18:22:37,825 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:37" (2/4) ... [2021-05-02 18:22:37,825 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@571475f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:22:37, skipping insertion in model container [2021-05-02 18:22:37,825 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:22:37" (3/4) ... [2021-05-02 18:22:37,825 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@571475f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:22:37, skipping insertion in model container [2021-05-02 18:22:37,825 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:22:37" (4/4) ... [2021-05-02 18:22:37,826 INFO L111 eAbstractionObserver]: Analyzing ICFG half.iJordan [2021-05-02 18:22:37,830 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:22:37,833 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:22:37,860 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:22:37,886 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:22:37,886 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:22:37,886 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:22:37,886 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:22:37,886 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:22:37,886 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:22:37,886 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:22:37,886 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:22:37,900 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 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 18:22:37,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 18:22:37,905 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:37,905 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:37,906 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:37,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:37,909 INFO L82 PathProgramCache]: Analyzing trace with hash -1612362112, now seen corresponding path program 1 times [2021-05-02 18:22:37,915 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:37,915 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717705093] [2021-05-02 18:22:37,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:37,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:38,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:38,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:38,084 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 18:22:38,084 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:38,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717705093] [2021-05-02 18:22:38,085 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [717705093] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:22:38,086 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:22:38,086 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 18:22:38,087 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056593935] [2021-05-02 18:22:38,093 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:22:38,094 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:38,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:22:38,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:22:38,106 INFO L87 Difference]: Start difference. First operand has 22 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 18:22:38,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:38,145 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-05-02 18:22:38,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:22:38,148 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 12 [2021-05-02 18:22:38,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:38,152 INFO L225 Difference]: With dead ends: 22 [2021-05-02 18:22:38,153 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 18:22:38,154 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 38.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:22:38,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 18:22:38,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 18:22:38,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:22:38,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-02 18:22:38,173 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2021-05-02 18:22:38,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:38,174 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-02 18:22:38,174 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 18:22:38,174 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-02 18:22:38,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 18:22:38,175 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:38,175 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:38,175 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:22:38,175 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:38,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:38,176 INFO L82 PathProgramCache]: Analyzing trace with hash -1611438591, now seen corresponding path program 1 times [2021-05-02 18:22:38,177 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:38,177 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494897868] [2021-05-02 18:22:38,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:38,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:38,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:38,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:38,347 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 18:22:38,348 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:38,348 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494897868] [2021-05-02 18:22:38,348 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1494897868] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:22:38,348 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:22:38,349 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 18:22:38,349 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306494413] [2021-05-02 18:22:38,350 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 18:22:38,350 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:38,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 18:22:38,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:22:38,352 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 8 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 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 18:22:38,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:38,539 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2021-05-02 18:22:38,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:22:38,540 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 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 12 [2021-05-02 18:22:38,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:38,541 INFO L225 Difference]: With dead ends: 25 [2021-05-02 18:22:38,542 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 18:22:38,543 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 167.4ms TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2021-05-02 18:22:38,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 18:22:38,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2021-05-02 18:22:38,547 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 18:22:38,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-05-02 18:22:38,548 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 12 [2021-05-02 18:22:38,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:38,548 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-05-02 18:22:38,549 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 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 18:22:38,549 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-05-02 18:22:38,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 18:22:38,550 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:38,550 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:38,550 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:22:38,551 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:38,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:38,554 INFO L82 PathProgramCache]: Analyzing trace with hash 1133798095, now seen corresponding path program 1 times [2021-05-02 18:22:38,554 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:38,554 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392721019] [2021-05-02 18:22:38,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:38,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:38,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:38,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:38,678 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:38,678 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:38,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392721019] [2021-05-02 18:22:38,678 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [392721019] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:38,679 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1042492709] [2021-05-02 18:22:38,679 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 18:22:38,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:38,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 18:22:38,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:38,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:38,852 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:38,852 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1042492709] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:38,852 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:38,852 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2021-05-02 18:22:38,852 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732268059] [2021-05-02 18:22:38,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 18:22:38,853 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:38,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 18:22:38,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:22:38,853 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 10 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:22:38,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:38,987 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-05-02 18:22:38,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:22:38,988 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 18:22:38,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:38,988 INFO L225 Difference]: With dead ends: 22 [2021-05-02 18:22:38,988 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 18:22:38,988 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 173.1ms TimeCoverageRelationStatistics Valid=60, Invalid=150, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:22:38,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 18:22:38,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 19. [2021-05-02 18:22:38,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:22:38,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 18:22:38,990 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2021-05-02 18:22:38,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:38,991 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 18:22:38,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:22:38,991 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 18:22:38,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 18:22:38,991 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:38,991 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:39,206 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 18:22:39,207 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:39,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:39,207 INFO L82 PathProgramCache]: Analyzing trace with hash -287339711, now seen corresponding path program 2 times [2021-05-02 18:22:39,208 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:39,208 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328538276] [2021-05-02 18:22:39,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:39,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:39,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:39,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:39,288 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:39,288 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:39,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328538276] [2021-05-02 18:22:39,288 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1328538276] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:39,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279584921] [2021-05-02 18:22:39,288 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 18:22:39,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:22:39,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:39,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:22:39,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:39,372 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:39,372 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [279584921] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:39,372 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:39,372 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 18:22:39,373 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845162621] [2021-05-02 18:22:39,373 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:22:39,373 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:39,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:22:39,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:22:39,373 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 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 18:22:39,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:39,449 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-05-02 18:22:39,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:22:39,450 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 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 18 [2021-05-02 18:22:39,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:39,450 INFO L225 Difference]: With dead ends: 22 [2021-05-02 18:22:39,450 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 18:22:39,450 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 77.1ms TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:22:39,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 18:22:39,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2021-05-02 18:22:39,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:22:39,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-05-02 18:22:39,452 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 18 [2021-05-02 18:22:39,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:39,453 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-05-02 18:22:39,453 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 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 18:22:39,453 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-05-02 18:22:39,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 18:22:39,453 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:39,453 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:39,671 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:39,671 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:39,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:39,672 INFO L82 PathProgramCache]: Analyzing trace with hash 600163970, now seen corresponding path program 1 times [2021-05-02 18:22:39,672 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:39,672 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942993548] [2021-05-02 18:22:39,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:39,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:39,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:39,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:39,821 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:39,821 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:39,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942993548] [2021-05-02 18:22:39,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [942993548] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:39,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838344473] [2021-05-02 18:22:39,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 18:22:39,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:39,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 18:22:39,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:39,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:39,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:39,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:39,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:40,031 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:40,031 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [838344473] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:40,031 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:40,031 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 19 [2021-05-02 18:22:40,031 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064265766] [2021-05-02 18:22:40,032 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 18:22:40,032 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:40,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 18:22:40,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2021-05-02 18:22:40,032 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 19 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 states have internal predecessors, (23), 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 18:22:40,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:40,462 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-02 18:22:40,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 18:22:40,464 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 states have internal predecessors, (23), 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 18 [2021-05-02 18:22:40,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:40,464 INFO L225 Difference]: With dead ends: 31 [2021-05-02 18:22:40,464 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 18:22:40,465 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 512.2ms TimeCoverageRelationStatistics Valid=155, Invalid=837, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:22:40,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 18:22:40,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2021-05-02 18:22:40,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:22:40,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-05-02 18:22:40,467 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 18 [2021-05-02 18:22:40,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:40,467 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-05-02 18:22:40,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 states have internal predecessors, (23), 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 18:22:40,467 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-05-02 18:22:40,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 18:22:40,468 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:40,468 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:40,682 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:40,683 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:40,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:40,683 INFO L82 PathProgramCache]: Analyzing trace with hash -2107595090, now seen corresponding path program 2 times [2021-05-02 18:22:40,684 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:40,684 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989476838] [2021-05-02 18:22:40,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:40,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:40,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:40,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:40,793 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:40,794 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:40,794 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989476838] [2021-05-02 18:22:40,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [989476838] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:40,794 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [645782692] [2021-05-02 18:22:40,794 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 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 18:22:40,841 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:22:40,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:40,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 18:22:40,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:40,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:40,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:40,970 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:40,970 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [645782692] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:40,970 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:40,970 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 16 [2021-05-02 18:22:40,970 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485562846] [2021-05-02 18:22:40,971 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 18:22:40,971 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:40,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 18:22:40,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:22:40,972 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 16 states, 16 states have (on average 1.625) internal successors, (26), 15 states have internal predecessors, (26), 2 states have call successors, (4), 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 18:22:41,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:41,346 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2021-05-02 18:22:41,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:22:41,347 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.625) internal successors, (26), 15 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 18:22:41,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:41,347 INFO L225 Difference]: With dead ends: 28 [2021-05-02 18:22:41,347 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 18:22:41,348 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 382.1ms TimeCoverageRelationStatistics Valid=101, Invalid=499, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:22:41,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 18:22:41,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 25. [2021-05-02 18:22:41,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.1) internal successors, (22), 20 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 18:22:41,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2021-05-02 18:22:41,350 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 21 [2021-05-02 18:22:41,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:41,350 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2021-05-02 18:22:41,350 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.625) internal successors, (26), 15 states have internal predecessors, (26), 2 states have call successors, (4), 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 18:22:41,350 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2021-05-02 18:22:41,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 18:22:41,351 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:41,351 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:41,564 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:41,565 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:41,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:41,565 INFO L82 PathProgramCache]: Analyzing trace with hash -881998078, now seen corresponding path program 3 times [2021-05-02 18:22:41,565 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:41,565 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467782330] [2021-05-02 18:22:41,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:41,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:41,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:41,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:41,644 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:41,644 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:41,644 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467782330] [2021-05-02 18:22:41,644 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1467782330] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:41,644 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [497644507] [2021-05-02 18:22:41,644 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 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 18:22:41,675 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 18:22:41,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:41,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 18:22:41,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:41,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:41,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:41,777 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:22:41,778 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [497644507] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:41,778 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:41,778 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-05-02 18:22:41,778 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872658895] [2021-05-02 18:22:41,778 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 18:22:41,778 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:41,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 18:22:41,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:22:41,779 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 11 states have internal predecessors, (31), 2 states have call successors, (4), 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 18:22:42,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:42,190 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2021-05-02 18:22:42,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:22:42,191 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 11 states have internal predecessors, (31), 2 states have call successors, (4), 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 24 [2021-05-02 18:22:42,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:42,194 INFO L225 Difference]: With dead ends: 39 [2021-05-02 18:22:42,194 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 18:22:42,194 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 396.7ms TimeCoverageRelationStatistics Valid=120, Invalid=342, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:22:42,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 18:22:42,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 34. [2021-05-02 18:22:42,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 29 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:22:42,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-02 18:22:42,203 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 24 [2021-05-02 18:22:42,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:42,203 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-02 18:22:42,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 11 states have internal predecessors, (31), 2 states have call successors, (4), 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 18:22:42,204 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-02 18:22:42,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 18:22:42,204 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:42,204 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:42,421 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:42,421 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:42,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:42,421 INFO L82 PathProgramCache]: Analyzing trace with hash 5505603, now seen corresponding path program 4 times [2021-05-02 18:22:42,422 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:42,422 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918153896] [2021-05-02 18:22:42,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:42,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:42,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:42,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:42,601 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:42,601 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:42,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918153896] [2021-05-02 18:22:42,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1918153896] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:42,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1896169123] [2021-05-02 18:22:42,601 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:42,644 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:22:42,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:42,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 18:22:42,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:42,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:42,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:42,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:42,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:42,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:42,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:42,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:42,860 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:42,860 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1896169123] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:42,860 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:42,860 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 24 [2021-05-02 18:22:42,860 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565283021] [2021-05-02 18:22:42,861 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 18:22:42,861 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:42,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 18:22:42,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:22:42,862 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 24 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 21 states have internal predecessors, (34), 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 18:22:43,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:43,527 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2021-05-02 18:22:43,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 18:22:43,528 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 21 states have internal predecessors, (34), 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 24 [2021-05-02 18:22:43,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:43,528 INFO L225 Difference]: With dead ends: 51 [2021-05-02 18:22:43,528 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 18:22:43,529 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 731.4ms TimeCoverageRelationStatistics Valid=218, Invalid=1504, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:22:43,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 18:22:43,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-05-02 18:22:43,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.1428571428571428) internal successors, (48), 42 states have internal predecessors, (48), 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 18:22:43,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 52 transitions. [2021-05-02 18:22:43,531 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 52 transitions. Word has length 24 [2021-05-02 18:22:43,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:43,532 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 52 transitions. [2021-05-02 18:22:43,532 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 21 states have internal predecessors, (34), 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 18:22:43,532 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 52 transitions. [2021-05-02 18:22:43,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 18:22:43,532 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:43,532 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:43,743 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:43,744 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:43,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:43,744 INFO L82 PathProgramCache]: Analyzing trace with hash -1971618098, now seen corresponding path program 5 times [2021-05-02 18:22:43,744 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:43,744 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223223541] [2021-05-02 18:22:43,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:43,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:43,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:43,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:43,898 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 18:22:43,898 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:43,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223223541] [2021-05-02 18:22:43,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1223223541] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:43,899 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [286033129] [2021-05-02 18:22:43,899 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:43,933 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 18:22:43,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:43,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 18:22:43,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:43,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,999 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 52 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 18:22:43,999 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [286033129] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:43,999 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:43,999 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 4] total 15 [2021-05-02 18:22:43,999 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412177001] [2021-05-02 18:22:43,999 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 18:22:43,999 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:44,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 18:22:44,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:22:44,000 INFO L87 Difference]: Start difference. First operand 47 states and 52 transitions. Second operand has 15 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 14 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:22:44,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:44,177 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2021-05-02 18:22:44,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 18:22:44,177 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 14 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 18:22:44,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:44,178 INFO L225 Difference]: With dead ends: 38 [2021-05-02 18:22:44,178 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 18:22:44,178 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 217.0ms TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2021-05-02 18:22:44,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 18:22:44,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2021-05-02 18:22:44,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.03125) internal successors, (33), 32 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 18:22:44,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2021-05-02 18:22:44,180 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 33 [2021-05-02 18:22:44,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:44,181 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2021-05-02 18:22:44,181 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 14 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:22:44,181 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2021-05-02 18:22:44,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 18:22:44,182 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:44,182 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:44,388 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:44,388 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:44,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:44,388 INFO L82 PathProgramCache]: Analyzing trace with hash 645024645, now seen corresponding path program 6 times [2021-05-02 18:22:44,389 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:44,389 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533891012] [2021-05-02 18:22:44,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:44,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:44,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:44,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:44,593 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:22:44,593 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:44,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533891012] [2021-05-02 18:22:44,593 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1533891012] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:44,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336170305] [2021-05-02 18:22:44,593 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:44,636 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-05-02 18:22:44,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:44,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 18:22:44,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:44,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:44,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:44,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:44,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:44,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:44,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:44,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:44,999 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:44,999 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1336170305] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:44,999 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:44,999 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 20] total 31 [2021-05-02 18:22:44,999 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890757656] [2021-05-02 18:22:45,000 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 18:22:45,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:45,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 18:22:45,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=828, Unknown=0, NotChecked=0, Total=930 [2021-05-02 18:22:45,001 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand has 31 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 28 states have internal predecessors, (48), 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 18:22:46,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:46,099 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2021-05-02 18:22:46,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 18:22:46,099 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 28 states have internal predecessors, (48), 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 36 [2021-05-02 18:22:46,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:46,099 INFO L225 Difference]: With dead ends: 43 [2021-05-02 18:22:46,100 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 18:22:46,100 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 943 ImplicationChecksByTransitivity, 1134.3ms TimeCoverageRelationStatistics Valid=307, Invalid=2885, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 18:22:46,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 18:22:46,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 18:22:46,101 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 18:22:46,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 18:22:46,101 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 36 [2021-05-02 18:22:46,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:46,101 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 18:22:46,101 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 28 states have internal predecessors, (48), 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 18:22:46,101 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 18:22:46,101 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 18:22:46,304 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 18:22:46,308 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:22:46 BasicIcfg [2021-05-02 18:22:46,308 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 18:22:46,308 INFO L168 Benchmark]: Toolchain (without parser) took 8902.55 ms. Allocated memory was 177.2 MB in the beginning and 212.9 MB in the end (delta: 35.7 MB). Free memory was 141.9 MB in the beginning and 104.0 MB in the end (delta: 37.9 MB). Peak memory consumption was 72.9 MB. Max. memory is 8.0 GB. [2021-05-02 18:22:46,309 INFO L168 Benchmark]: CDTParser took 0.09 ms. Allocated memory is still 177.2 MB. Free memory is still 158.4 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 18:22:46,309 INFO L168 Benchmark]: CACSL2BoogieTranslator took 164.67 ms. Allocated memory is still 177.2 MB. Free memory was 141.6 MB in the beginning and 160.0 MB in the end (delta: -18.4 MB). Peak memory consumption was 11.4 MB. Max. memory is 8.0 GB. [2021-05-02 18:22:46,309 INFO L168 Benchmark]: Boogie Preprocessor took 17.49 ms. Allocated memory is still 177.2 MB. Free memory was 160.0 MB in the beginning and 158.4 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 18:22:46,309 INFO L168 Benchmark]: RCFGBuilder took 213.11 ms. Allocated memory is still 177.2 MB. Free memory was 158.4 MB in the beginning and 143.7 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-02 18:22:46,309 INFO L168 Benchmark]: IcfgTransformer took 13.65 ms. Allocated memory is still 177.2 MB. Free memory was 143.7 MB in the beginning and 142.2 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 18:22:46,309 INFO L168 Benchmark]: TraceAbstraction took 8486.31 ms. Allocated memory was 177.2 MB in the beginning and 212.9 MB in the end (delta: 35.7 MB). Free memory was 142.2 MB in the beginning and 104.0 MB in the end (delta: 38.1 MB). Peak memory consumption was 75.1 MB. Max. memory is 8.0 GB. [2021-05-02 18:22:46,309 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09 ms. Allocated memory is still 177.2 MB. Free memory is still 158.4 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 164.67 ms. Allocated memory is still 177.2 MB. Free memory was 141.6 MB in the beginning and 160.0 MB in the end (delta: -18.4 MB). Peak memory consumption was 11.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 17.49 ms. Allocated memory is still 177.2 MB. Free memory was 160.0 MB in the beginning and 158.4 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 213.11 ms. Allocated memory is still 177.2 MB. Free memory was 158.4 MB in the beginning and 143.7 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * IcfgTransformer took 13.65 ms. Allocated memory is still 177.2 MB. Free memory was 143.7 MB in the beginning and 142.2 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 8486.31 ms. Allocated memory was 177.2 MB in the beginning and 212.9 MB in the end (delta: 35.7 MB). Free memory was 142.2 MB in the beginning and 104.0 MB in the end (delta: 38.1 MB). Peak memory consumption was 75.1 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, 22 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 8421.2ms, OverallIterations: 10, TraceHistogramMax: 8, EmptinessCheckTime: 17.6ms, AutomataDifference: 3635.2ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 5.6ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 111 SDtfs, 281 SDslu, 394 SDs, 0 SdLazy, 1560 SolverSat, 173 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 759.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 401 GetRequests, 176 SyntacticMatches, 6 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1895 ImplicationChecksByTransitivity, 3829.8ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=47occurred in iteration=8, InterpolantAutomatonStates: 125, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 37.6ms AutomataMinimizationTime, 10 MinimizatonAttempts, 21 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 57.4ms SsaConstructionTime, 262.4ms SatisfiabilityAnalysisTime, 2376.6ms InterpolantComputationTime, 402 NumberOfCodeBlocks, 378 NumberOfCodeBlocksAsserted, 35 NumberOfCheckSat, 384 ConstructedInterpolants, 0 QuantifiedInterpolants, 2590 SizeOfPredicates, 17 NumberOfNonLiveVariables, 728 ConjunctsInSsa, 121 ConjunctsInUnsatCore, 18 InterpolantComputations, 2 PerfectInterpolantSequences, 121/458 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...