/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops/linear_sea.ch.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:37:14,074 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:37:14,075 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:37:14,101 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:37:14,152 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:37:14,153 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:37:14,153 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:37:14,154 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 17:37:14,166 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:37:14,166 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:37:14,167 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:37:14,167 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:37:14,167 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:37:14,167 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:37:14,168 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:37:14,168 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:37:14,168 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:37:14,168 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:37:14,168 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:37:14,168 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:37:14,168 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:37:14,169 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:37:14,169 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:37:14,169 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:37:14,169 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 17:37:14,169 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:37:14,169 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:37:14,169 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:37:14,170 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:37:14,170 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 17:37:14,170 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:37:14,447 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:37:14,461 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:37:14,463 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:37:14,464 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:37:14,464 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:37:14,465 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/linear_sea.ch.c [2021-05-02 17:37:14,525 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f251982b3/bffb6da6bdeb4b079403305e8a871338/FLAGbdbbfc299 [2021-05-02 17:37:14,908 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:37:14,908 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/linear_sea.ch.c [2021-05-02 17:37:14,913 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f251982b3/bffb6da6bdeb4b079403305e8a871338/FLAGbdbbfc299 [2021-05-02 17:37:15,328 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f251982b3/bffb6da6bdeb4b079403305e8a871338 [2021-05-02 17:37:15,329 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:37:15,330 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 17:37:15,331 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:37:15,331 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:37:15,336 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:37:15,337 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:37:15" (1/1) ... [2021-05-02 17:37:15,337 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@cd6ed21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:15, skipping insertion in model container [2021-05-02 17:37:15,338 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:37:15" (1/1) ... [2021-05-02 17:37:15,342 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:37:15,353 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:37:15,431 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/linear_sea.ch.c[358,371] [2021-05-02 17:37:15,441 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:37:15,447 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:37:15,482 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/linear_sea.ch.c[358,371] [2021-05-02 17:37:15,486 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:37:15,504 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:37:15,504 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:15 WrapperNode [2021-05-02 17:37:15,505 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:37:15,505 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:37:15,505 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:37:15,505 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:37:15,513 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:15" (1/1) ... [2021-05-02 17:37:15,514 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:15" (1/1) ... [2021-05-02 17:37:15,525 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:15" (1/1) ... [2021-05-02 17:37:15,526 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:15" (1/1) ... [2021-05-02 17:37:15,537 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:15" (1/1) ... [2021-05-02 17:37:15,540 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:15" (1/1) ... [2021-05-02 17:37:15,541 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:15" (1/1) ... [2021-05-02 17:37:15,542 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:37:15,543 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:37:15,543 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:37:15,543 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:37:15,544 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:15" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:37:15,626 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:37:15,627 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:37:15,627 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:37:15,627 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:37:15,627 INFO L138 BoogieDeclarations]: Found implementation of procedure linear_search [2021-05-02 17:37:15,627 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:37:15,627 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:37:15,628 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:37:15,628 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:37:15,628 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:37:15,628 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-05-02 17:37:15,628 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:37:15,628 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-02 17:37:15,629 INFO L130 BoogieDeclarations]: Found specification of procedure linear_search [2021-05-02 17:37:15,629 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:37:15,629 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:37:15,629 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-05-02 17:37:15,629 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:37:15,630 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:37:15,630 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:37:15,632 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:37:15,632 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:37:15,863 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:37:15,864 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 17:37:15,864 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:37:15 BoogieIcfgContainer [2021-05-02 17:37:15,865 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:37:15,865 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 17:37:15,865 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 17:37:15,866 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 17:37:15,867 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:37:15" (1/1) ... [2021-05-02 17:37:15,879 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:37:15 BasicIcfg [2021-05-02 17:37:15,879 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 17:37:15,880 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:37:15,880 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:37:15,882 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:37:15,882 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:37:15" (1/4) ... [2021-05-02 17:37:15,883 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57265c80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:37:15, skipping insertion in model container [2021-05-02 17:37:15,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:15" (2/4) ... [2021-05-02 17:37:15,883 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57265c80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:37:15, skipping insertion in model container [2021-05-02 17:37:15,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:37:15" (3/4) ... [2021-05-02 17:37:15,883 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57265c80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:37:15, skipping insertion in model container [2021-05-02 17:37:15,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:37:15" (4/4) ... [2021-05-02 17:37:15,884 INFO L111 eAbstractionObserver]: Analyzing ICFG linear_sea.ch.cJordan [2021-05-02 17:37:15,887 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:37:15,890 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:37:15,900 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:37:15,912 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:37:15,912 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 17:37:15,913 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 17:37:15,913 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:37:15,913 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:37:15,913 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:37:15,913 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:37:15,913 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:37:15,922 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 17:37:15,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 17:37:15,927 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:15,928 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:15,928 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:15,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:15,932 INFO L82 PathProgramCache]: Analyzing trace with hash -1574378564, now seen corresponding path program 1 times [2021-05-02 17:37:15,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:15,937 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482720080] [2021-05-02 17:37:15,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:16,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:16,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:16,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:16,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 17:37:16,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:16,179 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:16,180 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:16,180 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1482720080] [2021-05-02 17:37:16,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1482720080] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:37:16,181 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:37:16,181 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:37:16,182 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430362590] [2021-05-02 17:37:16,190 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:37:16,191 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:16,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:37:16,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:37:16,206 INFO L87 Difference]: Start difference. First operand has 28 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:37:16,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:16,267 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2021-05-02 17:37:16,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:37:16,269 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-02 17:37:16,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:16,274 INFO L225 Difference]: With dead ends: 28 [2021-05-02 17:37:16,274 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 17:37:16,275 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 55.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:37:16,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 17:37:16,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-05-02 17:37:16,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:16,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-05-02 17:37:16,304 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 18 [2021-05-02 17:37:16,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:16,304 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-05-02 17:37:16,304 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:37:16,304 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-05-02 17:37:16,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 17:37:16,305 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:16,305 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:16,306 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:37:16,306 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:16,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:16,306 INFO L82 PathProgramCache]: Analyzing trace with hash -290534590, now seen corresponding path program 1 times [2021-05-02 17:37:16,307 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:16,307 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1849469259] [2021-05-02 17:37:16,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:16,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:16,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:16,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:16,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 17:37:16,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:16,522 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:16,523 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:16,523 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1849469259] [2021-05-02 17:37:16,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1849469259] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:37:16,523 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:37:16,524 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 17:37:16,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649783580] [2021-05-02 17:37:16,525 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:37:16,525 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:16,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:37:16,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:37:16,528 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:37:16,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:16,687 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2021-05-02 17:37:16,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:37:16,688 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2021-05-02 17:37:16,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:16,689 INFO L225 Difference]: With dead ends: 27 [2021-05-02 17:37:16,689 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 17:37:16,690 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 150.1ms TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:37:16,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 17:37:16,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-05-02 17:37:16,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:16,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-05-02 17:37:16,695 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 20 [2021-05-02 17:37:16,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:16,696 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-05-02 17:37:16,696 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:37:16,697 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-05-02 17:37:16,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 17:37:16,700 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:16,700 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:16,701 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 17:37:16,701 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:16,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:16,707 INFO L82 PathProgramCache]: Analyzing trace with hash 1452275745, now seen corresponding path program 1 times [2021-05-02 17:37:16,707 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:16,707 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265852214] [2021-05-02 17:37:16,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:16,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:16,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:16,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:16,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 17:37:16,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:16,847 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:16,847 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:16,847 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265852214] [2021-05-02 17:37:16,848 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1265852214] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:37:16,848 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:37:16,848 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 17:37:16,848 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901290687] [2021-05-02 17:37:16,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:37:16,848 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:16,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:37:16,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:37:16,849 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:17,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:17,027 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2021-05-02 17:37:17,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:37:17,027 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-02 17:37:17,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:17,029 INFO L225 Difference]: With dead ends: 25 [2021-05-02 17:37:17,029 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 17:37:17,029 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 157.1ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:37:17,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 17:37:17,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 17:37:17,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:17,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-05-02 17:37:17,034 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 20 [2021-05-02 17:37:17,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:17,034 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-05-02 17:37:17,034 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:17,034 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-05-02 17:37:17,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 17:37:17,035 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:17,035 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:17,036 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 17:37:17,036 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:17,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:17,036 INFO L82 PathProgramCache]: Analyzing trace with hash -824406910, now seen corresponding path program 1 times [2021-05-02 17:37:17,036 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:17,037 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387380142] [2021-05-02 17:37:17,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:17,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:17,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:17,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:17,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 17:37:17,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:17,225 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:17,225 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:17,227 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387380142] [2021-05-02 17:37:17,228 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387380142] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:17,228 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1105426949] [2021-05-02 17:37:17,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:17,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:17,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 17:37:17,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:17,439 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:17,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1105426949] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:17,439 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:17,439 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5] total 12 [2021-05-02 17:37:17,439 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521188119] [2021-05-02 17:37:17,440 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 17:37:17,440 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:17,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 17:37:17,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:37:17,441 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 17:37:17,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:17,673 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2021-05-02 17:37:17,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:37:17,674 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 17:37:17,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:17,675 INFO L225 Difference]: With dead ends: 28 [2021-05-02 17:37:17,675 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 17:37:17,676 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 269.1ms TimeCoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:37:17,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 17:37:17,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-02 17:37:17,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:17,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2021-05-02 17:37:17,684 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 23 [2021-05-02 17:37:17,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:17,684 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2021-05-02 17:37:17,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 17:37:17,684 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2021-05-02 17:37:17,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 17:37:17,685 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:17,686 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:17,901 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:17,901 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:17,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:17,902 INFO L82 PathProgramCache]: Analyzing trace with hash 646156417, now seen corresponding path program 2 times [2021-05-02 17:37:17,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:17,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [38851464] [2021-05-02 17:37:17,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:17,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:18,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:18,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:18,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 17:37:18,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:18,136 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 17:37:18,136 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:18,136 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [38851464] [2021-05-02 17:37:18,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [38851464] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:18,137 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [240269538] [2021-05-02 17:37:18,137 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:18,217 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-05-02 17:37:18,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:18,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 17:37:18,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:18,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,454 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 17:37:18,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [240269538] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:18,455 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:18,455 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 14 [2021-05-02 17:37:18,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325030843] [2021-05-02 17:37:18,455 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 17:37:18,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:18,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 17:37:18,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:37:18,456 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 17:37:18,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:18,800 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2021-05-02 17:37:18,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:37:18,801 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 26 [2021-05-02 17:37:18,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:18,802 INFO L225 Difference]: With dead ends: 33 [2021-05-02 17:37:18,802 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 17:37:18,802 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 417.0ms TimeCoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2021-05-02 17:37:18,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 17:37:18,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2021-05-02 17:37:18,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:18,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2021-05-02 17:37:18,805 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 26 [2021-05-02 17:37:18,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:18,805 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2021-05-02 17:37:18,805 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 17:37:18,805 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2021-05-02 17:37:18,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 17:37:18,805 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:18,806 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:19,016 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:19,017 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:19,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:19,017 INFO L82 PathProgramCache]: Analyzing trace with hash 449642912, now seen corresponding path program 1 times [2021-05-02 17:37:19,017 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:19,018 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752021709] [2021-05-02 17:37:19,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:19,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:19,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:19,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:19,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 17:37:19,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:19,547 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:19,547 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:19,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752021709] [2021-05-02 17:37:19,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1752021709] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:19,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1234471434] [2021-05-02 17:37:19,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:19,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:19,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 17:37:19,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:19,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,697 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-02 17:37:19,698 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 17:37:19,712 INFO L628 ElimStorePlain]: treesize reduction 52, result has 35.0 percent of original size [2021-05-02 17:37:19,712 INFO L518 ElimStorePlain]: Eliminatee |v_#memory_int_7| vanished before elimination [2021-05-02 17:37:19,713 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-02 17:37:19,713 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:84, output treesize:28 [2021-05-02 17:37:19,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,169 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:20,170 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1234471434] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:20,170 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:20,170 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 20 [2021-05-02 17:37:20,170 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099927365] [2021-05-02 17:37:20,170 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 17:37:20,171 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:20,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 17:37:20,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-05-02 17:37:20,171 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 20 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 17:37:21,391 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 97 [2021-05-02 17:37:22,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:22,179 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2021-05-02 17:37:22,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 17:37:22,180 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 26 [2021-05-02 17:37:22,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:22,180 INFO L225 Difference]: With dead ends: 36 [2021-05-02 17:37:22,180 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 17:37:22,181 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 1508.8ms TimeCoverageRelationStatistics Valid=152, Invalid=718, Unknown=0, NotChecked=0, Total=870 [2021-05-02 17:37:22,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 17:37:22,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2021-05-02 17:37:22,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 states have internal predecessors, (28), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:22,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-05-02 17:37:22,183 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 26 [2021-05-02 17:37:22,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:22,184 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-05-02 17:37:22,184 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 17:37:22,184 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-05-02 17:37:22,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 17:37:22,184 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:22,184 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:22,387 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:22,387 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:22,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:22,388 INFO L82 PathProgramCache]: Analyzing trace with hash 156239905, now seen corresponding path program 2 times [2021-05-02 17:37:22,388 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:22,388 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623212201] [2021-05-02 17:37:22,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:22,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:22,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:22,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:22,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 17:37:22,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:22,435 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 17:37:22,435 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:22,435 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623212201] [2021-05-02 17:37:22,435 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [623212201] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:37:22,435 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:37:22,435 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:37:22,435 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387963111] [2021-05-02 17:37:22,436 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:37:22,436 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:22,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:37:22,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:37:22,436 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:37:22,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:22,481 INFO L93 Difference]: Finished difference Result 32 states and 33 transitions. [2021-05-02 17:37:22,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:37:22,481 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 26 [2021-05-02 17:37:22,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:22,482 INFO L225 Difference]: With dead ends: 32 [2021-05-02 17:37:22,482 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 17:37:22,482 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 36.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:37:22,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 17:37:22,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 17:37:22,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 23 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:22,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2021-05-02 17:37:22,489 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2021-05-02 17:37:22,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:22,490 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2021-05-02 17:37:22,490 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:37:22,491 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2021-05-02 17:37:22,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 17:37:22,491 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:22,491 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:22,491 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-02 17:37:22,491 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:22,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:22,492 INFO L82 PathProgramCache]: Analyzing trace with hash 1335298369, now seen corresponding path program 3 times [2021-05-02 17:37:22,492 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:22,492 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031707525] [2021-05-02 17:37:22,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:22,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:22,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:22,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:22,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 17:37:22,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:23,289 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:23,289 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:23,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031707525] [2021-05-02 17:37:23,289 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031707525] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:23,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1296380185] [2021-05-02 17:37:23,289 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 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:23,431 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 17:37:23,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:23,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 17:37:23,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:23,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-02 17:37:23,470 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 17:37:23,489 INFO L628 ElimStorePlain]: treesize reduction 68, result has 34.6 percent of original size [2021-05-02 17:37:23,489 INFO L518 ElimStorePlain]: Eliminatee v_prenex_2 vanished before elimination [2021-05-02 17:37:23,490 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-02 17:37:23,490 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:108, output treesize:36 [2021-05-02 17:37:23,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:23,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,991 WARN L205 SmtUtils]: Spent 743.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 38 [2021-05-02 17:37:24,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:24,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:25,118 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:25,118 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1296380185] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:25,118 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:25,118 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14] total 28 [2021-05-02 17:37:25,118 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177169954] [2021-05-02 17:37:25,119 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 17:37:25,119 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:25,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 17:37:25,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=685, Unknown=0, NotChecked=0, Total=756 [2021-05-02 17:37:25,120 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand has 28 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 24 states have internal predecessors, (41), 6 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 17:37:25,774 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 92 [2021-05-02 17:37:26,408 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 86 [2021-05-02 17:37:26,559 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 88 [2021-05-02 17:37:26,798 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 100 [2021-05-02 17:37:27,323 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 88 [2021-05-02 17:37:27,504 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 98 [2021-05-02 17:37:27,660 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 93 [2021-05-02 17:37:28,040 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 99 [2021-05-02 17:37:28,214 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 90 [2021-05-02 17:37:28,394 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 86 [2021-05-02 17:37:28,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:28,520 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2021-05-02 17:37:28,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 17:37:28,521 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 24 states have internal predecessors, (41), 6 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 29 [2021-05-02 17:37:28,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:28,521 INFO L225 Difference]: With dead ends: 38 [2021-05-02 17:37:28,521 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 17:37:28,522 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 4152.9ms TimeCoverageRelationStatistics Valid=274, Invalid=1618, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 17:37:28,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 17:37:28,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 17:37:28,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:28,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2021-05-02 17:37:28,524 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2021-05-02 17:37:28,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:28,524 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2021-05-02 17:37:28,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 24 states have internal predecessors, (41), 6 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 17:37:28,524 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2021-05-02 17:37:28,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 17:37:28,524 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:28,524 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:28,725 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:28,725 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:28,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:28,725 INFO L82 PathProgramCache]: Analyzing trace with hash 1912918528, now seen corresponding path program 4 times [2021-05-02 17:37:28,726 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:28,726 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1732454793] [2021-05-02 17:37:28,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:28,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:28,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:28,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:28,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 17:37:28,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:29,972 WARN L205 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 87 [2021-05-02 17:37:32,152 WARN L205 SmtUtils]: Spent 1.93 s on a formula simplification. DAG size of input: 110 DAG size of output: 106 [2021-05-02 17:37:35,946 WARN L205 SmtUtils]: Spent 1.77 s on a formula simplification. DAG size of input: 109 DAG size of output: 105 [2021-05-02 17:37:40,990 WARN L205 SmtUtils]: Spent 1.25 s on a formula simplification. DAG size of input: 104 DAG size of output: 98 [2021-05-02 17:37:42,630 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 78 [2021-05-02 17:37:46,502 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 76 [2021-05-02 17:37:46,973 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 79 [2021-05-02 17:37:46,975 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:46,975 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:46,975 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1732454793] [2021-05-02 17:37:46,975 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1732454793] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:46,975 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1896090524] [2021-05-02 17:37:46,975 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:47,119 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:37:47,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:47,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 17:37:47,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:47,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:47,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:47,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:47,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:47,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:47,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-02 17:37:47,167 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 17:37:47,187 INFO L628 ElimStorePlain]: treesize reduction 68, result has 34.6 percent of original size [2021-05-02 17:37:47,187 INFO L518 ElimStorePlain]: Eliminatee v_prenex_3 vanished before elimination [2021-05-02 17:37:47,188 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-02 17:37:47,188 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:108, output treesize:36 [2021-05-02 17:37:47,532 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:47,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:47,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:47,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:47,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:47,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:47,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:47,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:47,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:47,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,116 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,503 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,505 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:48,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:49,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:49,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:49,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:49,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:49,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:49,547 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 49 [2021-05-02 17:37:49,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:49,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:49,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:49,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:49,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:49,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:49,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:49,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:49,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:49,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,448 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,595 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:50,990 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:50,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1896090524] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:50,991 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:50,991 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15] total 31 [2021-05-02 17:37:50,991 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372057440] [2021-05-02 17:37:50,991 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 17:37:50,991 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:50,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 17:37:50,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=845, Unknown=2, NotChecked=0, Total=930 [2021-05-02 17:37:50,992 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand has 31 states, 29 states have (on average 1.6206896551724137) internal successors, (47), 27 states have internal predecessors, (47), 6 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 17:37:51,665 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 83 [2021-05-02 17:37:51,889 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 83 [2021-05-02 17:37:52,477 WARN L205 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 92 [2021-05-02 17:37:52,823 WARN L205 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 144 DAG size of output: 120 [2021-05-02 17:37:53,359 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 124 [2021-05-02 17:37:54,108 WARN L205 SmtUtils]: Spent 547.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 150 [2021-05-02 17:37:56,307 WARN L205 SmtUtils]: Spent 741.00 ms on a formula simplification. DAG size of input: 312 DAG size of output: 125 [2021-05-02 17:37:56,953 WARN L205 SmtUtils]: Spent 394.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 129 [2021-05-02 17:37:58,206 WARN L205 SmtUtils]: Spent 918.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 150 [2021-05-02 17:38:11,830 WARN L205 SmtUtils]: Spent 6.92 s on a formula simplification. DAG size of input: 276 DAG size of output: 126 [2021-05-02 17:38:19,820 WARN L205 SmtUtils]: Spent 4.69 s on a formula simplification. DAG size of input: 206 DAG size of output: 124 [2021-05-02 17:38:25,094 WARN L205 SmtUtils]: Spent 975.00 ms on a formula simplification. DAG size of input: 208 DAG size of output: 119 [2021-05-02 17:38:27,715 WARN L205 SmtUtils]: Spent 1.96 s on a formula simplification. DAG size of input: 171 DAG size of output: 168 [2021-05-02 17:38:28,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:38:28,505 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2021-05-02 17:38:28,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 17:38:28,505 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 1.6206896551724137) internal successors, (47), 27 states have internal predecessors, (47), 6 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2021-05-02 17:38:28,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:38:28,506 INFO L225 Difference]: With dead ends: 41 [2021-05-02 17:38:28,506 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 17:38:28,507 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 21 SyntacticMatches, 4 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 414 ImplicationChecksByTransitivity, 56396.7ms TimeCoverageRelationStatistics Valid=339, Invalid=2107, Unknown=4, NotChecked=0, Total=2450 [2021-05-02 17:38:28,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 17:38:28,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2021-05-02 17:38:28,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 29 states have internal predecessors, (30), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:38:28,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2021-05-02 17:38:28,509 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2021-05-02 17:38:28,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:38:28,509 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2021-05-02 17:38:28,509 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 29 states have (on average 1.6206896551724137) internal successors, (47), 27 states have internal predecessors, (47), 6 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 17:38:28,509 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2021-05-02 17:38:28,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 17:38:28,510 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:38:28,510 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:38:28,717 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 17:38:28,717 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:38:28,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:38:28,718 INFO L82 PathProgramCache]: Analyzing trace with hash -138879775, now seen corresponding path program 5 times [2021-05-02 17:38:28,718 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:38:28,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48242887] [2021-05-02 17:38:28,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:38:28,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:28,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:38:28,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:28,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 17:38:28,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat