/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loop-simple/nested_3.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 19:06:14,917 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 19:06:14,919 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 19:06:14,950 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 19:06:14,994 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 19:06:14,994 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 19:06:14,995 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 19:06:14,995 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 19:06:15,011 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 19:06:15,012 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 19:06:15,014 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 19:06:15,014 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 19:06:15,014 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 19:06:15,014 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 19:06:15,014 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 19:06:15,015 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 19:06:15,015 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 19:06:15,015 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 19:06:15,015 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 19:06:15,016 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 19:06:15,016 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 19:06:15,016 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 19:06:15,016 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 19:06:15,016 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 19:06:15,016 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 19:06:15,016 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 19:06:15,016 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 19:06:15,016 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 19:06:15,017 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 19:06:15,017 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 19:06:15,017 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 19:06:15,284 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 19:06:15,304 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 19:06:15,306 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 19:06:15,307 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 19:06:15,307 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 19:06:15,308 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-simple/nested_3.c [2021-05-02 19:06:15,370 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ca1228f29/99f263301fd64db4a34618cb34352af8/FLAG6f0252165 [2021-05-02 19:06:15,689 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 19:06:15,689 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_3.c [2021-05-02 19:06:15,694 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ca1228f29/99f263301fd64db4a34618cb34352af8/FLAG6f0252165 [2021-05-02 19:06:16,107 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ca1228f29/99f263301fd64db4a34618cb34352af8 [2021-05-02 19:06:16,109 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 19:06:16,110 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 19:06:16,114 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 19:06:16,114 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 19:06:16,116 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 19:06:16,117 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:06:16" (1/1) ... [2021-05-02 19:06:16,118 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@71971e5a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:16, skipping insertion in model container [2021-05-02 19:06:16,118 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:06:16" (1/1) ... [2021-05-02 19:06:16,123 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 19:06:16,132 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 19:06:16,246 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_3.c[784,797] [2021-05-02 19:06:16,249 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:06:16,255 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 19:06:16,264 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_3.c[784,797] [2021-05-02 19:06:16,265 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:06:16,273 INFO L208 MainTranslator]: Completed translation [2021-05-02 19:06:16,273 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:16 WrapperNode [2021-05-02 19:06:16,273 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 19:06:16,274 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 19:06:16,274 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 19:06:16,274 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 19:06:16,281 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:16" (1/1) ... [2021-05-02 19:06:16,281 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:16" (1/1) ... [2021-05-02 19:06:16,285 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:16" (1/1) ... [2021-05-02 19:06:16,285 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:16" (1/1) ... [2021-05-02 19:06:16,288 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:16" (1/1) ... [2021-05-02 19:06:16,311 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:16" (1/1) ... [2021-05-02 19:06:16,311 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:16" (1/1) ... [2021-05-02 19:06:16,317 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 19:06:16,318 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 19:06:16,318 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 19:06:16,318 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 19:06:16,327 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:16" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 19:06:16,384 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 19:06:16,385 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 19:06:16,385 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 19:06:16,385 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 19:06:16,385 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 19:06:16,385 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 19:06:16,385 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 19:06:16,385 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 19:06:16,385 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 19:06:16,386 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 19:06:16,386 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 19:06:16,386 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 19:06:16,386 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 19:06:16,386 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 19:06:16,637 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 19:06:16,638 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-05-02 19:06:16,639 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:06:16 BoogieIcfgContainer [2021-05-02 19:06:16,639 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 19:06:16,639 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 19:06:16,639 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 19:06:16,640 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 19:06:16,642 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:06:16" (1/1) ... [2021-05-02 19:06:16,669 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:06:16 BasicIcfg [2021-05-02 19:06:16,669 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 19:06:16,670 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 19:06:16,670 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 19:06:16,672 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 19:06:16,672 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 07:06:16" (1/4) ... [2021-05-02 19:06:16,673 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57a57b0f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:06:16, skipping insertion in model container [2021-05-02 19:06:16,673 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:06:16" (2/4) ... [2021-05-02 19:06:16,673 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57a57b0f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:06:16, skipping insertion in model container [2021-05-02 19:06:16,673 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:06:16" (3/4) ... [2021-05-02 19:06:16,674 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57a57b0f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:06:16, skipping insertion in model container [2021-05-02 19:06:16,674 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:06:16" (4/4) ... [2021-05-02 19:06:16,674 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_3.cJordan [2021-05-02 19:06:16,678 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 19:06:16,688 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 19:06:16,699 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 19:06:16,729 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 19:06:16,729 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 19:06:16,729 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 19:06:16,729 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 19:06:16,729 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 19:06:16,729 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 19:06:16,729 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 19:06:16,729 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 19:06:16,742 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:06:16,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 19:06:16,748 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:16,749 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:16,749 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:16,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:16,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1420630675, now seen corresponding path program 1 times [2021-05-02 19:06:16,759 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:16,759 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073081573] [2021-05-02 19:06:16,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:16,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:16,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:16,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:16,976 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:16,977 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:16,977 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073081573] [2021-05-02 19:06:16,977 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073081573] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:16,978 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:06:16,978 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 19:06:16,979 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097347530] [2021-05-02 19:06:16,984 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 19:06:16,984 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:16,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 19:06:16,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:06:16,996 INFO L87 Difference]: Start difference. First operand has 20 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:17,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:17,023 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2021-05-02 19:06:17,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 19:06:17,025 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-05-02 19:06:17,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:17,029 INFO L225 Difference]: With dead ends: 20 [2021-05-02 19:06:17,030 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 19:06:17,031 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 57.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:06:17,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 19:06:17,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 19:06:17,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:17,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2021-05-02 19:06:17,051 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2021-05-02 19:06:17,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:17,052 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2021-05-02 19:06:17,052 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:17,052 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2021-05-02 19:06:17,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 19:06:17,053 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:17,053 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:17,053 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 19:06:17,053 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:17,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:17,054 INFO L82 PathProgramCache]: Analyzing trace with hash -1420629714, now seen corresponding path program 1 times [2021-05-02 19:06:17,054 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:17,054 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2056385079] [2021-05-02 19:06:17,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:17,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:17,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:17,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:17,161 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:17,161 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:17,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2056385079] [2021-05-02 19:06:17,161 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2056385079] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:17,161 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:06:17,161 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:06:17,162 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132082887] [2021-05-02 19:06:17,162 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:06:17,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:17,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:06:17,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:06:17,163 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:17,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:17,244 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2021-05-02 19:06:17,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:06:17,245 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-05-02 19:06:17,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:17,245 INFO L225 Difference]: With dead ends: 21 [2021-05-02 19:06:17,246 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 19:06:17,246 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 58.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:06:17,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 19:06:17,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 16. [2021-05-02 19:06:17,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:17,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-05-02 19:06:17,248 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2021-05-02 19:06:17,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:17,249 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-05-02 19:06:17,249 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:17,249 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-05-02 19:06:17,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 19:06:17,249 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:17,249 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:17,249 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 19:06:17,249 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:17,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:17,250 INFO L82 PathProgramCache]: Analyzing trace with hash 659479704, now seen corresponding path program 1 times [2021-05-02 19:06:17,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:17,250 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687437523] [2021-05-02 19:06:17,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:17,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:17,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:17,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:17,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:17,329 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:17,330 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687437523] [2021-05-02 19:06:17,330 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1687437523] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:17,330 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:06:17,330 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:06:17,330 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246186221] [2021-05-02 19:06:17,330 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:06:17,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:17,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:06:17,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:06:17,331 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:17,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:17,401 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2021-05-02 19:06:17,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:06:17,401 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 19:06:17,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:17,402 INFO L225 Difference]: With dead ends: 20 [2021-05-02 19:06:17,402 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 19:06:17,402 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 56.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:06:17,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 19:06:17,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2021-05-02 19:06:17,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:17,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-02 19:06:17,404 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2021-05-02 19:06:17,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:17,404 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-02 19:06:17,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:17,404 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-02 19:06:17,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 19:06:17,405 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:17,405 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:17,405 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 19:06:17,405 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:17,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:17,405 INFO L82 PathProgramCache]: Analyzing trace with hash 1034663169, now seen corresponding path program 1 times [2021-05-02 19:06:17,406 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:17,406 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296166889] [2021-05-02 19:06:17,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:17,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:17,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:17,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:17,489 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:17,489 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:17,489 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296166889] [2021-05-02 19:06:17,489 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296166889] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:17,489 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:06:17,489 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:06:17,490 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241033690] [2021-05-02 19:06:17,490 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:06:17,490 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:17,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:06:17,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:06:17,491 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:17,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:17,559 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2021-05-02 19:06:17,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:06:17,559 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 19:06:17,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:17,560 INFO L225 Difference]: With dead ends: 19 [2021-05-02 19:06:17,560 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 19:06:17,560 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 46.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:06:17,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 19:06:17,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2021-05-02 19:06:17,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:17,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-05-02 19:06:17,562 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2021-05-02 19:06:17,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:17,562 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-05-02 19:06:17,562 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:17,563 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-05-02 19:06:17,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 19:06:17,563 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:17,563 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:17,563 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 19:06:17,563 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:17,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:17,564 INFO L82 PathProgramCache]: Analyzing trace with hash -120195778, now seen corresponding path program 1 times [2021-05-02 19:06:17,564 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:17,564 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1566923121] [2021-05-02 19:06:17,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:17,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:17,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:17,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:17,648 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:17,649 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:17,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1566923121] [2021-05-02 19:06:17,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1566923121] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:17,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267514498] [2021-05-02 19:06:17,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:17,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:17,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 19:06:17,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:17,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:17,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:17,750 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:17,750 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1267514498] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:17,751 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:17,751 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 19:06:17,751 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003975979] [2021-05-02 19:06:17,751 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 19:06:17,751 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:17,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 19:06:17,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 19:06:17,752 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:17,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:17,819 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2021-05-02 19:06:17,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 19:06:17,819 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 19:06:17,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:17,820 INFO L225 Difference]: With dead ends: 21 [2021-05-02 19:06:17,820 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 19:06:17,820 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 65.9ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:06:17,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 19:06:17,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-05-02 19:06:17,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:17,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-05-02 19:06:17,822 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2021-05-02 19:06:17,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:17,823 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-05-02 19:06:17,823 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:17,823 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-05-02 19:06:17,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 19:06:17,823 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:17,823 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:18,042 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:18,043 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:18,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:18,043 INFO L82 PathProgramCache]: Analyzing trace with hash -1838081477, now seen corresponding path program 2 times [2021-05-02 19:06:18,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:18,044 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597133823] [2021-05-02 19:06:18,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:18,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:18,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:18,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:18,088 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 19:06:18,088 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:18,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597133823] [2021-05-02 19:06:18,089 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597133823] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:18,089 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [69892929] [2021-05-02 19:06:18,089 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:18,121 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:06:18,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:18,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 19:06:18,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:18,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:18,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:18,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:18,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:18,173 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:06:18,173 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [69892929] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:18,173 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:18,173 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-05-02 19:06:18,174 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791111227] [2021-05-02 19:06:18,174 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:06:18,174 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:18,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:06:18,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:06:18,175 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:18,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:18,472 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2021-05-02 19:06:18,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 19:06:18,472 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 19:06:18,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:18,473 INFO L225 Difference]: With dead ends: 42 [2021-05-02 19:06:18,473 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 19:06:18,473 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 271.6ms TimeCoverageRelationStatistics Valid=117, Invalid=225, Unknown=0, NotChecked=0, Total=342 [2021-05-02 19:06:18,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 19:06:18,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 31. [2021-05-02 19:06:18,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 27 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:18,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-05-02 19:06:18,476 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 19 [2021-05-02 19:06:18,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:18,476 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-05-02 19:06:18,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:18,476 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-05-02 19:06:18,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 19:06:18,477 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:18,477 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:18,693 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:18,693 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:18,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:18,694 INFO L82 PathProgramCache]: Analyzing trace with hash -1258084200, now seen corresponding path program 3 times [2021-05-02 19:06:18,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:18,694 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638229363] [2021-05-02 19:06:18,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:18,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:18,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:18,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:18,736 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-05-02 19:06:18,737 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:18,737 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638229363] [2021-05-02 19:06:18,737 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [638229363] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:18,737 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1154370050] [2021-05-02 19:06:18,737 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:18,770 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 19:06:18,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:18,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 19:06:18,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:18,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:18,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:18,817 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-05-02 19:06:18,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1154370050] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:18,817 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:18,817 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 19:06:18,817 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404146899] [2021-05-02 19:06:18,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 19:06:18,818 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:18,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 19:06:18,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 19:06:18,825 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:18,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:18,882 INFO L93 Difference]: Finished difference Result 72 states and 81 transitions. [2021-05-02 19:06:18,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 19:06:18,882 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-02 19:06:18,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:18,883 INFO L225 Difference]: With dead ends: 72 [2021-05-02 19:06:18,883 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 19:06:18,883 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 46.9ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:06:18,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 19:06:18,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 52. [2021-05-02 19:06:18,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 48 states have (on average 1.1458333333333333) internal successors, (55), 48 states have internal predecessors, (55), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:18,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2021-05-02 19:06:18,887 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 30 [2021-05-02 19:06:18,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:18,887 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2021-05-02 19:06:18,887 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:18,887 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2021-05-02 19:06:18,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 19:06:18,888 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:18,888 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:19,105 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:19,108 INFO L428 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:19,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:19,108 INFO L82 PathProgramCache]: Analyzing trace with hash 899649390, now seen corresponding path program 4 times [2021-05-02 19:06:19,108 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:19,109 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688025074] [2021-05-02 19:06:19,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:19,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:19,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:19,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:19,199 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 82 proven. 9 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 19:06:19,199 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:19,199 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688025074] [2021-05-02 19:06:19,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [688025074] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:19,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1687001385] [2021-05-02 19:06:19,200 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:19,233 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 19:06:19,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:19,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 19:06:19,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:19,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:19,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:19,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:19,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:19,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:19,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:19,290 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 82 proven. 9 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 19:06:19,291 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1687001385] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:19,291 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:19,291 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 19:06:19,291 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222902080] [2021-05-02 19:06:19,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:06:19,291 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:19,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:06:19,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:06:19,292 INFO L87 Difference]: Start difference. First operand 52 states and 58 transitions. Second operand has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:19,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:19,381 INFO L93 Difference]: Finished difference Result 64 states and 70 transitions. [2021-05-02 19:06:19,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 19:06:19,381 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 19:06:19,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:19,382 INFO L225 Difference]: With dead ends: 64 [2021-05-02 19:06:19,382 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 19:06:19,382 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 81.0ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:06:19,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 19:06:19,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 60. [2021-05-02 19:06:19,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 56 states have (on average 1.125) internal successors, (63), 56 states have internal predecessors, (63), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:19,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 66 transitions. [2021-05-02 19:06:19,386 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 66 transitions. Word has length 51 [2021-05-02 19:06:19,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:19,386 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 66 transitions. [2021-05-02 19:06:19,386 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:19,386 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 66 transitions. [2021-05-02 19:06:19,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 19:06:19,387 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:19,387 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:19,606 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:19,607 INFO L428 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:19,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:19,607 INFO L82 PathProgramCache]: Analyzing trace with hash -307441554, now seen corresponding path program 5 times [2021-05-02 19:06:19,607 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:19,608 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077874980] [2021-05-02 19:06:19,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:19,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:19,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:19,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:19,659 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 130 proven. 16 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-05-02 19:06:19,659 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:19,659 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077874980] [2021-05-02 19:06:19,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1077874980] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:19,659 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [475346935] [2021-05-02 19:06:19,659 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:19,683 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 19:06:19,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:19,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 19:06:19,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:19,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:19,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:19,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:19,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:19,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:19,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:19,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:19,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:19,747 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 218 proven. 16 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2021-05-02 19:06:19,747 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [475346935] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:19,747 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:19,748 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 19:06:19,748 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544417213] [2021-05-02 19:06:19,748 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:06:19,748 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:19,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:06:19,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:06:19,749 INFO L87 Difference]: Start difference. First operand 60 states and 66 transitions. Second operand has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:19,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:19,864 INFO L93 Difference]: Finished difference Result 72 states and 78 transitions. [2021-05-02 19:06:19,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 19:06:19,864 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 19:06:19,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:19,865 INFO L225 Difference]: With dead ends: 72 [2021-05-02 19:06:19,865 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 19:06:19,865 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 117.5ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:06:19,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 19:06:19,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 68. [2021-05-02 19:06:19,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 64 states have (on average 1.109375) internal successors, (71), 64 states have internal predecessors, (71), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:19,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 74 transitions. [2021-05-02 19:06:19,868 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 74 transitions. Word has length 59 [2021-05-02 19:06:19,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:19,869 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 74 transitions. [2021-05-02 19:06:19,869 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:19,869 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 74 transitions. [2021-05-02 19:06:19,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 19:06:19,869 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:19,869 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:20,085 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:20,085 INFO L428 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:20,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:20,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1842610542, now seen corresponding path program 6 times [2021-05-02 19:06:20,086 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:20,086 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839681817] [2021-05-02 19:06:20,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:20,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:20,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:20,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:20,142 INFO L134 CoverageAnalysis]: Checked inductivity of 491 backedges. 190 proven. 25 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-05-02 19:06:20,143 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:20,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839681817] [2021-05-02 19:06:20,143 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1839681817] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:20,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2048683125] [2021-05-02 19:06:20,143 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:20,181 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2021-05-02 19:06:20,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:20,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 19:06:20,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:20,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:20,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:20,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:20,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:20,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:20,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:20,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:20,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:20,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:20,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:20,253 INFO L134 CoverageAnalysis]: Checked inductivity of 491 backedges. 318 proven. 25 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2021-05-02 19:06:20,254 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2048683125] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:20,254 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:20,254 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 19:06:20,254 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558136712] [2021-05-02 19:06:20,254 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 19:06:20,254 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:20,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 19:06:20,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:06:20,255 INFO L87 Difference]: Start difference. First operand 68 states and 74 transitions. Second operand has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:20,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:20,377 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2021-05-02 19:06:20,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:06:20,377 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-05-02 19:06:20,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:20,377 INFO L225 Difference]: With dead ends: 76 [2021-05-02 19:06:20,378 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 19:06:20,378 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 122.1ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 19:06:20,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 19:06:20,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2021-05-02 19:06:20,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 72 states have (on average 1.0972222222222223) internal successors, (79), 72 states have internal predecessors, (79), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:20,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2021-05-02 19:06:20,383 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 67 [2021-05-02 19:06:20,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:20,383 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2021-05-02 19:06:20,383 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:20,383 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2021-05-02 19:06:20,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 19:06:20,384 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:20,384 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:20,598 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:20,598 INFO L428 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:20,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:20,599 INFO L82 PathProgramCache]: Analyzing trace with hash -7150994, now seen corresponding path program 7 times [2021-05-02 19:06:20,599 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:20,599 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396884906] [2021-05-02 19:06:20,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:20,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:20,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:20,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:20,644 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 355 proven. 89 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2021-05-02 19:06:20,644 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:20,644 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1396884906] [2021-05-02 19:06:20,644 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1396884906] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:20,644 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269562615] [2021-05-02 19:06:20,644 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:20,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:20,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 19:06:20,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:20,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:20,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:20,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:20,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:20,786 INFO L134 CoverageAnalysis]: Checked inductivity of 679 backedges. 355 proven. 89 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2021-05-02 19:06:20,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [269562615] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:20,786 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:20,786 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 19:06:20,786 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398146991] [2021-05-02 19:06:20,787 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 19:06:20,787 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:20,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 19:06:20,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 19:06:20,788 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 6 states have internal predecessors, (33), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:20,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:20,873 INFO L93 Difference]: Finished difference Result 134 states and 144 transitions. [2021-05-02 19:06:20,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 19:06:20,873 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 6 states have internal predecessors, (33), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-05-02 19:06:20,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:20,874 INFO L225 Difference]: With dead ends: 134 [2021-05-02 19:06:20,874 INFO L226 Difference]: Without dead ends: 134 [2021-05-02 19:06:20,874 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 60.5ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:06:20,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-02 19:06:20,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 106. [2021-05-02 19:06:20,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 102 states have (on average 1.088235294117647) internal successors, (111), 102 states have internal predecessors, (111), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:20,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 114 transitions. [2021-05-02 19:06:20,891 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 114 transitions. Word has length 75 [2021-05-02 19:06:20,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:20,891 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 114 transitions. [2021-05-02 19:06:20,891 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 6 states have internal predecessors, (33), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:20,891 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 114 transitions. [2021-05-02 19:06:20,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 19:06:20,892 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:20,892 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 6, 6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:21,100 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:21,100 INFO L428 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:21,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:21,101 INFO L82 PathProgramCache]: Analyzing trace with hash -1891744272, now seen corresponding path program 8 times [2021-05-02 19:06:21,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:21,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535054465] [2021-05-02 19:06:21,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:21,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:21,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:21,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:21,217 INFO L134 CoverageAnalysis]: Checked inductivity of 1538 backedges. 792 proven. 264 refuted. 0 times theorem prover too weak. 482 trivial. 0 not checked. [2021-05-02 19:06:21,217 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:21,217 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535054465] [2021-05-02 19:06:21,217 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535054465] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:21,217 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1070078938] [2021-05-02 19:06:21,217 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:21,292 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:06:21,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:21,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 19:06:21,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:21,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:21,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:21,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:21,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:21,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:21,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:21,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1538 backedges. 792 proven. 264 refuted. 0 times theorem prover too weak. 482 trivial. 0 not checked. [2021-05-02 19:06:21,391 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1070078938] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:21,391 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:06:21,391 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 19:06:21,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045090656] [2021-05-02 19:06:21,392 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:06:21,392 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:21,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:06:21,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:06:21,393 INFO L87 Difference]: Start difference. First operand 106 states and 114 transitions. Second operand has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:21,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:21,506 INFO L93 Difference]: Finished difference Result 164 states and 176 transitions. [2021-05-02 19:06:21,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 19:06:21,507 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 105 [2021-05-02 19:06:21,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:21,508 INFO L225 Difference]: With dead ends: 164 [2021-05-02 19:06:21,508 INFO L226 Difference]: Without dead ends: 164 [2021-05-02 19:06:21,508 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 98.4ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:06:21,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-05-02 19:06:21,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 136. [2021-05-02 19:06:21,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 132 states have (on average 1.0833333333333333) internal successors, (143), 132 states have internal predecessors, (143), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:21,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 146 transitions. [2021-05-02 19:06:21,526 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 146 transitions. Word has length 105 [2021-05-02 19:06:21,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:21,527 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 146 transitions. [2021-05-02 19:06:21,527 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:21,527 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 146 transitions. [2021-05-02 19:06:21,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-05-02 19:06:21,528 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:06:21,528 INFO L523 BasicCegarLoop]: trace histogram [48, 48, 8, 8, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:06:21,749 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 19:06:21,749 INFO L428 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:06:21,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:06:21,750 INFO L82 PathProgramCache]: Analyzing trace with hash -69706770, now seen corresponding path program 9 times [2021-05-02 19:06:21,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:06:21,750 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2130307353] [2021-05-02 19:06:21,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:06:21,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:21,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:06:21,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:06:21,816 INFO L134 CoverageAnalysis]: Checked inductivity of 2745 backedges. 1403 proven. 526 refuted. 0 times theorem prover too weak. 816 trivial. 0 not checked. [2021-05-02 19:06:21,816 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:06:21,816 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2130307353] [2021-05-02 19:06:21,816 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2130307353] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:06:21,816 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1367682393] [2021-05-02 19:06:21,816 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:21,877 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2021-05-02 19:06:21,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:06:21,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 19:06:21,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:06:22,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:22,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:22,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:22,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:22,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:22,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:22,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:06:22,109 INFO L134 CoverageAnalysis]: Checked inductivity of 2745 backedges. 1677 proven. 0 refuted. 0 times theorem prover too weak. 1068 trivial. 0 not checked. [2021-05-02 19:06:22,110 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1367682393] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:06:22,110 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:06:22,110 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [8] total 17 [2021-05-02 19:06:22,110 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982751784] [2021-05-02 19:06:22,110 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 19:06:22,110 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:06:22,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 19:06:22,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-02 19:06:22,111 INFO L87 Difference]: Start difference. First operand 136 states and 146 transitions. Second operand has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:22,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:06:22,130 INFO L93 Difference]: Finished difference Result 134 states and 144 transitions. [2021-05-02 19:06:22,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:06:22,131 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 135 [2021-05-02 19:06:22,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:06:22,131 INFO L225 Difference]: With dead ends: 134 [2021-05-02 19:06:22,131 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 19:06:22,131 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 104.3ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-02 19:06:22,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 19:06:22,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 19:06:22,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 19:06:22,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 19:06:22,132 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 135 [2021-05-02 19:06:22,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:06:22,132 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 19:06:22,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:06:22,132 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 19:06:22,132 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 19:06:22,348 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:06:22,352 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:06:22 BasicIcfg [2021-05-02 19:06:22,352 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 19:06:22,352 INFO L168 Benchmark]: Toolchain (without parser) took 6242.44 ms. Allocated memory was 176.2 MB in the beginning and 254.8 MB in the end (delta: 78.6 MB). Free memory was 142.0 MB in the beginning and 102.7 MB in the end (delta: 39.3 MB). Peak memory consumption was 119.0 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:22,353 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 176.2 MB. Free memory is still 158.8 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 19:06:22,353 INFO L168 Benchmark]: CACSL2BoogieTranslator took 159.80 ms. Allocated memory is still 176.2 MB. Free memory was 141.8 MB in the beginning and 132.6 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:22,353 INFO L168 Benchmark]: Boogie Preprocessor took 43.27 ms. Allocated memory is still 176.2 MB. Free memory was 132.6 MB in the beginning and 160.8 MB in the end (delta: -28.2 MB). Peak memory consumption was 6.4 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:22,353 INFO L168 Benchmark]: RCFGBuilder took 320.90 ms. Allocated memory is still 176.2 MB. Free memory was 160.8 MB in the beginning and 147.1 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:22,353 INFO L168 Benchmark]: IcfgTransformer took 29.89 ms. Allocated memory is still 176.2 MB. Free memory was 146.6 MB in the beginning and 145.5 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:22,353 INFO L168 Benchmark]: TraceAbstraction took 5681.76 ms. Allocated memory was 176.2 MB in the beginning and 254.8 MB in the end (delta: 78.6 MB). Free memory was 145.0 MB in the beginning and 102.7 MB in the end (delta: 42.3 MB). Peak memory consumption was 122.0 MB. Max. memory is 8.0 GB. [2021-05-02 19:06:22,353 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 176.2 MB. Free memory is still 158.8 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 159.80 ms. Allocated memory is still 176.2 MB. Free memory was 141.8 MB in the beginning and 132.6 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 43.27 ms. Allocated memory is still 176.2 MB. Free memory was 132.6 MB in the beginning and 160.8 MB in the end (delta: -28.2 MB). Peak memory consumption was 6.4 MB. Max. memory is 8.0 GB. * RCFGBuilder took 320.90 ms. Allocated memory is still 176.2 MB. Free memory was 160.8 MB in the beginning and 147.1 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * IcfgTransformer took 29.89 ms. Allocated memory is still 176.2 MB. Free memory was 146.6 MB in the beginning and 145.5 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 5681.76 ms. Allocated memory was 176.2 MB in the beginning and 254.8 MB in the end (delta: 78.6 MB). Free memory was 145.0 MB in the beginning and 102.7 MB in the end (delta: 42.3 MB). Peak memory consumption was 122.0 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 29]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 5621.9ms, OverallIterations: 13, TraceHistogramMax: 48, EmptinessCheckTime: 15.5ms, AutomataDifference: 1259.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 10.0ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 179 SDtfs, 334 SDslu, 139 SDs, 0 SdLazy, 431 SolverSat, 86 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 365.4ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 681 GetRequests, 573 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1187.6ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=136occurred in iteration=12, InterpolantAutomatonStates: 85, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 71.6ms AutomataMinimizationTime, 13 MinimizatonAttempts, 105 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 88.7ms SsaConstructionTime, 274.9ms SatisfiabilityAnalysisTime, 1648.6ms InterpolantComputationTime, 1161 NumberOfCodeBlocks, 1048 NumberOfCodeBlocksAsserted, 72 NumberOfCheckSat, 1139 ConstructedInterpolants, 0 QuantifiedInterpolants, 2447 SizeOfPredicates, 3 NumberOfNonLiveVariables, 1250 ConjunctsInSsa, 47 ConjunctsInUnsatCore, 22 InterpolantComputations, 5 PerfectInterpolantSequences, 10774/12115 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...