/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops/sum01_bug02.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:38:52,304 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:38:52,307 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:38:52,338 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:38:52,376 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:38:52,377 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:38:52,377 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:38:52,380 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 17:38:52,392 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:38:52,392 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:38:52,394 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:38:52,394 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:38:52,394 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:38:52,394 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:38:52,394 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:38:52,395 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:38:52,395 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:38:52,395 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:38:52,395 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:38:52,395 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:38:52,395 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:38:52,396 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:38:52,396 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:38:52,396 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:38:52,396 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 17:38:52,396 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:38:52,396 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:38:52,396 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:38:52,396 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:38:52,397 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 17:38:52,397 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:38:52,629 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:38:52,647 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:38:52,649 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:38:52,650 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:38:52,651 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:38:52,652 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01_bug02.i [2021-05-02 17:38:52,694 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ef9835e01/7372fc174cc64ac18f616f2dfa5c17de/FLAGb39b8c3df [2021-05-02 17:38:52,997 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:38:52,997 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02.i [2021-05-02 17:38:53,001 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ef9835e01/7372fc174cc64ac18f616f2dfa5c17de/FLAGb39b8c3df [2021-05-02 17:38:53,423 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ef9835e01/7372fc174cc64ac18f616f2dfa5c17de [2021-05-02 17:38:53,425 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:38:53,427 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 17:38:53,429 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:38:53,429 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:38:53,432 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:38:53,432 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:38:53" (1/1) ... [2021-05-02 17:38:53,433 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@775fe1fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:38:53, skipping insertion in model container [2021-05-02 17:38:53,433 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:38:53" (1/1) ... [2021-05-02 17:38:53,438 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:38:53,447 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:38:53,524 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02.i[812,825] [2021-05-02 17:38:53,530 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:38:53,535 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:38:53,543 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02.i[812,825] [2021-05-02 17:38:53,545 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:38:53,590 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:38:53,591 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:38:53 WrapperNode [2021-05-02 17:38:53,591 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:38:53,592 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:38:53,592 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:38:53,592 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:38:53,599 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:38:53" (1/1) ... [2021-05-02 17:38:53,599 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:38:53" (1/1) ... [2021-05-02 17:38:53,606 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:38:53" (1/1) ... [2021-05-02 17:38:53,606 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:38:53" (1/1) ... [2021-05-02 17:38:53,619 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:38:53" (1/1) ... [2021-05-02 17:38:53,627 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:38:53" (1/1) ... [2021-05-02 17:38:53,628 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:38:53" (1/1) ... [2021-05-02 17:38:53,629 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:38:53,629 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:38:53,629 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:38:53,629 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:38:53,630 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:38:53" (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 17:38:53,684 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:38:53,684 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:38:53,684 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:38:53,684 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:38:53,684 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:38:53,685 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:38:53,685 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:38:53,685 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 17:38:53,685 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 17:38:53,685 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:38:53,685 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:38:53,686 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:38:53,686 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-02 17:38:53,686 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:38:53,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:38:53,686 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:38:53,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:38:53,686 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:38:53,687 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:38:53,687 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:38:53,887 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:38:53,887 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 17:38:53,888 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:38:53 BoogieIcfgContainer [2021-05-02 17:38:53,888 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:38:53,888 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 17:38:53,888 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 17:38:53,889 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 17:38:53,890 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:38:53" (1/1) ... [2021-05-02 17:38:53,917 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:38:53 BasicIcfg [2021-05-02 17:38:53,917 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 17:38:53,918 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:38:53,918 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:38:53,920 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:38:53,920 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:38:53" (1/4) ... [2021-05-02 17:38:53,920 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d2ffcfc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:38:53, skipping insertion in model container [2021-05-02 17:38:53,921 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:38:53" (2/4) ... [2021-05-02 17:38:53,921 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d2ffcfc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:38:53, skipping insertion in model container [2021-05-02 17:38:53,921 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:38:53" (3/4) ... [2021-05-02 17:38:53,924 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d2ffcfc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:38:53, skipping insertion in model container [2021-05-02 17:38:53,924 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:38:53" (4/4) ... [2021-05-02 17:38:53,925 INFO L111 eAbstractionObserver]: Analyzing ICFG sum01_bug02.iJordan [2021-05-02 17:38:53,928 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:38:53,931 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:38:53,941 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:38:53,960 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:38:53,960 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 17:38:53,960 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 17:38:53,960 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:38:53,960 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:38:53,960 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:38:53,961 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:38:53,961 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:38:53,968 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 17:38:53,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 17:38:53,973 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:38:53,973 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:38:53,974 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:38:53,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:38:53,977 INFO L82 PathProgramCache]: Analyzing trace with hash -962722453, now seen corresponding path program 1 times [2021-05-02 17:38:53,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:38:53,982 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1148061448] [2021-05-02 17:38:53,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:38:54,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:54,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:38:54,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:54,091 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 17:38:54,091 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:38:54,091 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1148061448] [2021-05-02 17:38:54,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1148061448] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:38:54,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:38:54,092 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:38:54,093 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337122120] [2021-05-02 17:38:54,095 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:38:54,095 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:38:54,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:38:54,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:38:54,104 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:54,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:38:54,137 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2021-05-02 17:38:54,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:38:54,139 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 17:38:54,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:38:54,143 INFO L225 Difference]: With dead ends: 21 [2021-05-02 17:38:54,144 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 17:38:54,145 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:38:54,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 17:38:54,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 17:38:54,161 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 17:38:54,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-02 17:38:54,162 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-02 17:38:54,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:38:54,163 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-02 17:38:54,163 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:54,163 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-02 17:38:54,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 17:38:54,163 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:38:54,164 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:38:54,164 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:38:54,164 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:38:54,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:38:54,164 INFO L82 PathProgramCache]: Analyzing trace with hash -961798932, now seen corresponding path program 1 times [2021-05-02 17:38:54,165 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:38:54,165 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427577488] [2021-05-02 17:38:54,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:38:54,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:54,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:38:54,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:54,255 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 17:38:54,255 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:38:54,255 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427577488] [2021-05-02 17:38:54,255 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [427577488] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:38:54,255 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:38:54,255 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 17:38:54,255 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701517146] [2021-05-02 17:38:54,256 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:38:54,256 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:38:54,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:38:54,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:38:54,257 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:54,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:38:54,367 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-05-02 17:38:54,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:38:54,368 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 17:38:54,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:38:54,368 INFO L225 Difference]: With dead ends: 22 [2021-05-02 17:38:54,368 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 17:38:54,369 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 84.0ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:38:54,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 17:38:54,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 17:38:54,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:54,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-05-02 17:38:54,372 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 11 [2021-05-02 17:38:54,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:38:54,372 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-05-02 17:38:54,372 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:54,372 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-05-02 17:38:54,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 17:38:54,372 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:38:54,373 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:38:54,373 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 17:38:54,373 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:38:54,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:38:54,373 INFO L82 PathProgramCache]: Analyzing trace with hash 1546847175, now seen corresponding path program 1 times [2021-05-02 17:38:54,373 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:38:54,374 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719681469] [2021-05-02 17:38:54,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:38:54,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:54,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:38:54,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:54,496 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 17:38:54,496 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:38:54,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719681469] [2021-05-02 17:38:54,496 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [719681469] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:54,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2137449757] [2021-05-02 17:38:54,497 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 17:38:54,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:54,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 17:38:54,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:38:54,639 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:54,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:54,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:54,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:54,729 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 17:38:54,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2137449757] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:54,730 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:38:54,730 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 15 [2021-05-02 17:38:54,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83983453] [2021-05-02 17:38:54,730 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 17:38:54,730 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:38:54,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 17:38:54,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:38:54,731 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 15 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 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 17:38:54,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:38:54,931 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2021-05-02 17:38:54,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:38:54,931 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 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 15 [2021-05-02 17:38:54,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:38:54,933 INFO L225 Difference]: With dead ends: 32 [2021-05-02 17:38:54,933 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 17:38:54,934 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 262.2ms TimeCoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2021-05-02 17:38:54,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 17:38:54,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 24. [2021-05-02 17:38:54,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:54,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-05-02 17:38:54,936 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 15 [2021-05-02 17:38:54,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:38:54,937 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-05-02 17:38:54,937 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 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 17:38:54,937 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-05-02 17:38:54,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 17:38:54,937 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:38:54,937 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:38:55,144 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 17:38:55,145 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:38:55,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:38:55,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1944388898, now seen corresponding path program 2 times [2021-05-02 17:38:55,146 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:38:55,146 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9084664] [2021-05-02 17:38:55,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:38:55,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:55,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:38:55,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:55,280 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:38:55,280 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:38:55,280 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9084664] [2021-05-02 17:38:55,280 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [9084664] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:55,280 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [349879714] [2021-05-02 17:38:55,280 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 17:38:55,312 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:38:55,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:38:55,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 17:38:55,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:38:55,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:55,605 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:38:55,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [349879714] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:55,606 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:38:55,606 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 20 [2021-05-02 17:38:55,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911495799] [2021-05-02 17:38:55,608 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 17:38:55,608 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:38:55,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 17:38:55,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=324, Unknown=0, NotChecked=0, Total=380 [2021-05-02 17:38:55,610 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 20 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 states have internal predecessors, (25), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:38:56,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:38:56,356 INFO L93 Difference]: Finished difference Result 45 states and 52 transitions. [2021-05-02 17:38:56,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 17:38:56,357 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 states have internal predecessors, (25), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2021-05-02 17:38:56,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:38:56,357 INFO L225 Difference]: With dead ends: 45 [2021-05-02 17:38:56,357 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 17:38:56,358 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 750.5ms TimeCoverageRelationStatistics Valid=196, Invalid=994, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 17:38:56,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 17:38:56,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 32. [2021-05-02 17:38:56,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 27 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 17:38:56,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2021-05-02 17:38:56,362 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 19 [2021-05-02 17:38:56,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:38:56,362 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2021-05-02 17:38:56,362 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 states have internal predecessors, (25), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:38:56,362 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2021-05-02 17:38:56,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 17:38:56,362 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:38:56,363 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:38:56,563 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:38:56,564 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:38:56,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:38:56,564 INFO L82 PathProgramCache]: Analyzing trace with hash -607768063, now seen corresponding path program 1 times [2021-05-02 17:38:56,564 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:38:56,564 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209559126] [2021-05-02 17:38:56,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:38:56,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:56,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:38:56,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:56,619 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:38:56,619 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:38:56,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209559126] [2021-05-02 17:38:56,620 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [209559126] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:56,620 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [280265543] [2021-05-02 17:38:56,620 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 17:38:56,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:56,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 17:38:56,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:38:56,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:56,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:56,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:56,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:56,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:56,757 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:38:56,757 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [280265543] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:56,757 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:38:56,757 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2021-05-02 17:38:56,757 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862841413] [2021-05-02 17:38:56,757 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:38:56,758 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:38:56,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:38:56,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:38:56,758 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 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 17:38:56,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:38:56,849 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2021-05-02 17:38:56,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:38:56,849 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 17:38:56,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:38:56,850 INFO L225 Difference]: With dead ends: 28 [2021-05-02 17:38:56,850 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 17:38:56,850 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 90.7ms TimeCoverageRelationStatistics Valid=53, Invalid=79, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:38:56,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 17:38:56,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 17:38:56,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:56,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-05-02 17:38:56,856 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 19 [2021-05-02 17:38:56,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:38:56,856 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-05-02 17:38:56,856 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 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 17:38:56,856 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-05-02 17:38:56,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 17:38:56,857 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:38:56,857 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:38:57,057 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:38:57,058 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:38:57,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:38:57,058 INFO L82 PathProgramCache]: Analyzing trace with hash -577630756, now seen corresponding path program 2 times [2021-05-02 17:38:57,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:38:57,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602955091] [2021-05-02 17:38:57,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:38:57,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:57,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:38:57,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:57,202 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:38:57,202 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:38:57,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602955091] [2021-05-02 17:38:57,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [602955091] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:57,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772816451] [2021-05-02 17:38:57,203 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 17:38:57,234 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:38:57,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:38:57,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 17:38:57,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:38:57,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:57,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:57,268 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:57,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:57,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:57,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:57,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:57,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:57,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:57,330 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:38:57,330 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772816451] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:57,330 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:38:57,330 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2021-05-02 17:38:57,330 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355147927] [2021-05-02 17:38:57,330 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 17:38:57,331 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:38:57,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 17:38:57,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=92, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:38:57,331 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 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 17:38:57,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:38:57,485 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2021-05-02 17:38:57,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:38:57,485 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 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 23 [2021-05-02 17:38:57,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:38:57,485 INFO L225 Difference]: With dead ends: 28 [2021-05-02 17:38:57,486 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 17:38:57,486 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 169.6ms TimeCoverageRelationStatistics Valid=119, Invalid=187, Unknown=0, NotChecked=0, Total=306 [2021-05-02 17:38:57,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 17:38:57,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 17:38:57,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 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 17:38:57,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2021-05-02 17:38:57,488 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 23 [2021-05-02 17:38:57,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:38:57,488 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2021-05-02 17:38:57,488 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 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 17:38:57,488 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2021-05-02 17:38:57,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 17:38:57,489 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:38:57,489 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:38:57,704 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:38:57,705 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:38:57,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:38:57,705 INFO L82 PathProgramCache]: Analyzing trace with hash -1272621224, now seen corresponding path program 3 times [2021-05-02 17:38:57,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:38:57,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2114495589] [2021-05-02 17:38:57,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:38:57,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:57,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:38:57,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:57,838 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 17:38:57,838 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:38:57,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2114495589] [2021-05-02 17:38:57,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2114495589] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:57,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [389501493] [2021-05-02 17:38:57,838 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 17:38:57,882 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 17:38:57,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:38:57,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 17:38:57,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:38:58,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:58,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:58,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:58,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:58,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:58,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:58,094 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:38:58,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [389501493] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:58,094 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:38:58,094 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 24 [2021-05-02 17:38:58,094 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437552577] [2021-05-02 17:38:58,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 17:38:58,095 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:38:58,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 17:38:58,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-05-02 17:38:58,095 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand has 24 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 21 states have internal predecessors, (36), 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 17:38:59,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:38:59,065 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2021-05-02 17:38:59,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 17:38:59,065 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 21 states have internal predecessors, (36), 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 27 [2021-05-02 17:38:59,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:38:59,066 INFO L225 Difference]: With dead ends: 47 [2021-05-02 17:38:59,066 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 17:38:59,067 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 488 ImplicationChecksByTransitivity, 935.8ms TimeCoverageRelationStatistics Valid=238, Invalid=1742, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 17:38:59,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 17:38:59,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 29. [2021-05-02 17:38:59,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 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 17:38:59,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2021-05-02 17:38:59,069 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 27 [2021-05-02 17:38:59,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:38:59,069 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2021-05-02 17:38:59,069 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 21 states have internal predecessors, (36), 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 17:38:59,069 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2021-05-02 17:38:59,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 17:38:59,070 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:38:59,070 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:38:59,276 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 17:38:59,277 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:38:59,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:38:59,277 INFO L82 PathProgramCache]: Analyzing trace with hash 470189111, now seen corresponding path program 3 times [2021-05-02 17:38:59,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:38:59,278 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1408279736] [2021-05-02 17:38:59,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:38:59,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:59,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:38:59,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:59,363 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:38:59,363 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:38:59,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1408279736] [2021-05-02 17:38:59,363 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1408279736] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:59,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [139937332] [2021-05-02 17:38:59,364 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:38:59,398 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 17:38:59,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:38:59,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 17:38:59,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:38:59,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:59,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:59,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:59,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:59,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:59,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:59,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:59,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:59,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:59,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:59,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:59,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:59,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:59,514 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:38:59,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [139937332] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:59,514 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:38:59,514 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 17 [2021-05-02 17:38:59,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576717045] [2021-05-02 17:38:59,515 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 17:38:59,515 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:38:59,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 17:38:59,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=161, Unknown=0, NotChecked=0, Total=272 [2021-05-02 17:38:59,515 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:59,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:38:59,694 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-05-02 17:38:59,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:38:59,694 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 17:38:59,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:38:59,694 INFO L225 Difference]: With dead ends: 34 [2021-05-02 17:38:59,695 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 17:38:59,695 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 193.1ms TimeCoverageRelationStatistics Valid=209, Invalid=343, Unknown=0, NotChecked=0, Total=552 [2021-05-02 17:38:59,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 17:38:59,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 17:38:59,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 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 17:38:59,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2021-05-02 17:38:59,697 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 27 [2021-05-02 17:38:59,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:38:59,697 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2021-05-02 17:38:59,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:59,697 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2021-05-02 17:38:59,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 17:38:59,698 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:38:59,698 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:38:59,901 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:38:59,901 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:38:59,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:38:59,901 INFO L82 PathProgramCache]: Analyzing trace with hash -2074979054, now seen corresponding path program 4 times [2021-05-02 17:38:59,901 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:38:59,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479871586] [2021-05-02 17:38:59,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:38:59,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:59,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:38:59,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:59,993 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 13 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:38:59,993 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:38:59,993 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479871586] [2021-05-02 17:38:59,993 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479871586] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:59,993 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [295762375] [2021-05-02 17:38:59,993 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:39:00,039 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:39:00,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:39:00,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 17:39:00,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:39:00,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:39:00,181 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 13 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:39:00,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [295762375] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:39:00,181 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:39:00,181 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 21 [2021-05-02 17:39:00,182 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794716104] [2021-05-02 17:39:00,182 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 17:39:00,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:39:00,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 17:39:00,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=250, Unknown=0, NotChecked=0, Total=420 [2021-05-02 17:39:00,183 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 21 states, 21 states have (on average 2.238095238095238) internal successors, (47), 20 states have internal predecessors, (47), 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 17:39:00,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:39:00,452 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2021-05-02 17:39:00,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 17:39:00,452 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.238095238095238) internal successors, (47), 20 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 17:39:00,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:39:00,453 INFO L225 Difference]: With dead ends: 39 [2021-05-02 17:39:00,453 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 17:39:00,453 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 314.3ms TimeCoverageRelationStatistics Valid=336, Invalid=594, Unknown=0, NotChecked=0, Total=930 [2021-05-02 17:39:00,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 17:39:00,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2021-05-02 17:39:00,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 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 17:39:00,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-05-02 17:39:00,456 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 31 [2021-05-02 17:39:00,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:39:00,456 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-05-02 17:39:00,456 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.238095238095238) internal successors, (47), 20 states have internal predecessors, (47), 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 17:39:00,456 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-05-02 17:39:00,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 17:39:00,456 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:39:00,457 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:39:00,672 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 17:39:00,673 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:39:00,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:39:00,673 INFO L82 PathProgramCache]: Analyzing trace with hash 1313095789, now seen corresponding path program 5 times [2021-05-02 17:39:00,673 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:39:00,673 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482534597] [2021-05-02 17:39:00,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:39:00,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 17:39:00,682 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 17:39:00,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 17:39:00,691 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 17:39:00,703 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 17:39:00,704 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 17:39:00,704 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-02 17:39:00,721 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:39:00 BasicIcfg [2021-05-02 17:39:00,721 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 17:39:00,722 INFO L168 Benchmark]: Toolchain (without parser) took 7295.23 ms. Allocated memory was 207.6 MB in the beginning and 324.0 MB in the end (delta: 116.4 MB). Free memory was 172.3 MB in the beginning and 188.6 MB in the end (delta: -16.3 MB). Peak memory consumption was 100.4 MB. Max. memory is 8.0 GB. [2021-05-02 17:39:00,722 INFO L168 Benchmark]: CDTParser took 0.09 ms. Allocated memory is still 207.6 MB. Free memory is still 188.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 17:39:00,722 INFO L168 Benchmark]: CACSL2BoogieTranslator took 162.06 ms. Allocated memory is still 207.6 MB. Free memory was 172.1 MB in the beginning and 191.7 MB in the end (delta: -19.7 MB). Peak memory consumption was 18.7 MB. Max. memory is 8.0 GB. [2021-05-02 17:39:00,722 INFO L168 Benchmark]: Boogie Preprocessor took 36.97 ms. Allocated memory is still 207.6 MB. Free memory was 191.7 MB in the beginning and 190.2 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 17:39:00,722 INFO L168 Benchmark]: RCFGBuilder took 258.58 ms. Allocated memory is still 207.6 MB. Free memory was 190.2 MB in the beginning and 176.0 MB in the end (delta: 14.2 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-05-02 17:39:00,722 INFO L168 Benchmark]: IcfgTransformer took 28.82 ms. Allocated memory is still 207.6 MB. Free memory was 176.0 MB in the beginning and 174.4 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 17:39:00,722 INFO L168 Benchmark]: TraceAbstraction took 6803.38 ms. Allocated memory was 207.6 MB in the beginning and 324.0 MB in the end (delta: 116.4 MB). Free memory was 174.4 MB in the beginning and 188.6 MB in the end (delta: -14.2 MB). Peak memory consumption was 101.7 MB. Max. memory is 8.0 GB. [2021-05-02 17:39:00,723 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 207.6 MB. Free memory is still 188.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 162.06 ms. Allocated memory is still 207.6 MB. Free memory was 172.1 MB in the beginning and 191.7 MB in the end (delta: -19.7 MB). Peak memory consumption was 18.7 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 36.97 ms. Allocated memory is still 207.6 MB. Free memory was 191.7 MB in the beginning and 190.2 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 258.58 ms. Allocated memory is still 207.6 MB. Free memory was 190.2 MB in the beginning and 176.0 MB in the end (delta: 14.2 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * IcfgTransformer took 28.82 ms. Allocated memory is still 207.6 MB. Free memory was 176.0 MB in the beginning and 174.4 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * TraceAbstraction took 6803.38 ms. Allocated memory was 207.6 MB in the beginning and 324.0 MB in the end (delta: 116.4 MB). Free memory was 174.4 MB in the beginning and 188.6 MB in the end (delta: -14.2 MB). Peak memory consumption was 101.7 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L23] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L23] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L24] i=1 VAL [i=1, j=10, n=0, n=6] [L24] COND TRUE i<=n VAL [i=1, j=10, n=6, n=0] [L25] COND TRUE i