/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_2-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:51:45,725 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:51:45,727 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:51:45,753 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 17:51:45,754 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 17:51:45,755 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 17:51:45,756 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 17:51:45,758 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 17:51:45,759 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 17:51:45,760 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 17:51:45,761 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 17:51:45,762 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2021-05-02 17:51:45,784 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:51:45,785 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:51:45,786 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:51:45,787 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 17:51:45,815 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:51:45,816 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:51:45,819 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:51:45,819 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:51:45,819 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:51:45,819 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:51:45,820 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:51:45,820 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:51:45,820 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:51:45,820 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:51:45,821 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:51:45,821 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:51:45,822 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:51:45,822 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:51:45,822 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:51:45,822 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:51:45,822 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 17:51:45,822 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:51:45,822 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:51:45,823 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:51:45,823 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:51:45,824 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 17:51:45,824 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:51:46,138 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:51:46,167 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:51:46,170 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:51:46,171 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:51:46,171 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:51:46,172 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_2-2.i [2021-05-02 17:51:46,241 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b6689541a/46100ae85f7140319820c4473ded9f5c/FLAG039a1c074 [2021-05-02 17:51:46,725 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:51:46,726 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_2-2.i [2021-05-02 17:51:46,732 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b6689541a/46100ae85f7140319820c4473ded9f5c/FLAG039a1c074 [2021-05-02 17:51:47,117 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b6689541a/46100ae85f7140319820c4473ded9f5c [2021-05-02 17:51:47,120 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:51:47,122 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 17:51:47,125 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:51:47,125 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:51:47,129 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:51:47,129 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:51:47" (1/1) ... [2021-05-02 17:51:47,130 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3bab934 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:47, skipping insertion in model container [2021-05-02 17:51:47,131 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:51:47" (1/1) ... [2021-05-02 17:51:47,140 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:51:47,154 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:51:47,303 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_2-2.i[849,862] [2021-05-02 17:51:47,318 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:51:47,324 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:51:47,344 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_2-2.i[849,862] [2021-05-02 17:51:47,359 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:51:47,380 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:51:47,381 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:47 WrapperNode [2021-05-02 17:51:47,381 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:51:47,382 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:51:47,382 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:51:47,382 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:51:47,392 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:47" (1/1) ... [2021-05-02 17:51:47,392 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:47" (1/1) ... [2021-05-02 17:51:47,398 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:47" (1/1) ... [2021-05-02 17:51:47,399 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:47" (1/1) ... [2021-05-02 17:51:47,415 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:47" (1/1) ... [2021-05-02 17:51:47,423 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:47" (1/1) ... [2021-05-02 17:51:47,428 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:47" (1/1) ... [2021-05-02 17:51:47,429 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:51:47,430 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:51:47,430 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:51:47,430 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:51:47,431 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:47" (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 17:51:47,506 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:51:47,507 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:51:47,507 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:51:47,507 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:51:47,507 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:51:47,508 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:51:47,508 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:51:47,508 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 17:51:47,508 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 17:51:47,508 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:51:47,509 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:51:47,509 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 17:51:47,509 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:51:47,509 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:51:47,510 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:51:47,510 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:51:47,510 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:51:47,510 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:51:47,511 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:51:47,511 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:51:47,742 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:51:47,743 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 17:51:47,744 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:51:47 BoogieIcfgContainer [2021-05-02 17:51:47,744 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:51:47,745 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 17:51:47,745 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 17:51:47,745 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 17:51:47,748 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:51:47" (1/1) ... [2021-05-02 17:51:47,781 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:51:47 BasicIcfg [2021-05-02 17:51:47,781 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 17:51:47,783 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:51:47,783 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:51:47,785 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:51:47,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:51:47" (1/4) ... [2021-05-02 17:51:47,786 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a3340a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:51:47, skipping insertion in model container [2021-05-02 17:51:47,786 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:51:47" (2/4) ... [2021-05-02 17:51:47,786 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a3340a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:51:47, skipping insertion in model container [2021-05-02 17:51:47,786 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:51:47" (3/4) ... [2021-05-02 17:51:47,787 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a3340a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:51:47, skipping insertion in model container [2021-05-02 17:51:47,787 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:51:47" (4/4) ... [2021-05-02 17:51:47,787 INFO L111 eAbstractionObserver]: Analyzing ICFG array_2-2.iJordan [2021-05-02 17:51:47,792 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:51:47,812 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:51:47,838 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:51:47,853 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:51:47,853 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 17:51:47,853 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 17:51:47,853 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:51:47,853 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:51:47,853 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:51:47,853 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:51:47,853 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:51:47,867 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 17:51:47,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 17:51:47,873 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:47,874 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:47,874 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:47,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:47,879 INFO L82 PathProgramCache]: Analyzing trace with hash -742242332, now seen corresponding path program 1 times [2021-05-02 17:51:47,891 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:47,891 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194201326] [2021-05-02 17:51:47,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:48,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:48,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:48,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:48,155 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 17:51:48,155 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:48,156 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194201326] [2021-05-02 17:51:48,156 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1194201326] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:51:48,156 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:51:48,157 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:51:48,157 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375300672] [2021-05-02 17:51:48,161 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:51:48,161 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:48,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:51:48,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:51:48,176 INFO L87 Difference]: Start difference. First operand has 24 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:48,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:48,244 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2021-05-02 17:51:48,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:51:48,246 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 17:51:48,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:48,251 INFO L225 Difference]: With dead ends: 24 [2021-05-02 17:51:48,252 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 17:51:48,253 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 51.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:51:48,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 17:51:48,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 17:51:48,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:48,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-02 17:51:48,280 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2021-05-02 17:51:48,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:48,280 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-02 17:51:48,280 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:48,281 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-02 17:51:48,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 17:51:48,281 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:48,281 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:48,282 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:51:48,282 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:48,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:48,282 INFO L82 PathProgramCache]: Analyzing trace with hash 1029197154, now seen corresponding path program 1 times [2021-05-02 17:51:48,283 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:48,283 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [970516454] [2021-05-02 17:51:48,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:48,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:48,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:48,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:48,413 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 17:51:48,413 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:48,414 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [970516454] [2021-05-02 17:51:48,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [970516454] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:51:48,414 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:51:48,414 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:51:48,414 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702577345] [2021-05-02 17:51:48,415 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:51:48,416 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:48,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:51:48,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:51:48,417 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:48,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:48,509 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2021-05-02 17:51:48,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:51:48,510 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 17:51:48,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:48,511 INFO L225 Difference]: With dead ends: 21 [2021-05-02 17:51:48,511 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 17:51:48,512 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 25.8ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:51:48,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 17:51:48,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2021-05-02 17:51:48,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:48,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 17:51:48,515 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-02 17:51:48,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:48,516 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 17:51:48,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:48,516 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 17:51:48,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 17:51:48,516 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:48,517 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 17:51:48,517 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 17:51:48,517 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:48,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:48,517 INFO L82 PathProgramCache]: Analyzing trace with hash 559300038, now seen corresponding path program 1 times [2021-05-02 17:51:48,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:48,518 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [615336460] [2021-05-02 17:51:48,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:48,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:48,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:48,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:48,637 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:51:48,637 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:48,637 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [615336460] [2021-05-02 17:51:48,638 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [615336460] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:48,638 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1675553065] [2021-05-02 17:51:48,638 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 17:51:48,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:48,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 17:51:48,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:48,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:48,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:48,797 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:51:48,798 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1675553065] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:48,798 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:48,798 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 17:51:48,798 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713510419] [2021-05-02 17:51:48,799 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:51:48,799 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:48,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:51:48,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:51:48,800 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:48,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:48,840 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2021-05-02 17:51:48,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 17:51:48,840 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 17:51:48,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:48,841 INFO L225 Difference]: With dead ends: 25 [2021-05-02 17:51:48,841 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 17:51:48,842 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 36.4ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:51:48,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 17:51:48,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2021-05-02 17:51:48,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:48,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-05-02 17:51:48,845 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2021-05-02 17:51:48,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:48,845 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-05-02 17:51:48,845 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:48,846 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-05-02 17:51:48,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 17:51:48,846 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:48,846 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:49,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 17:51:49,069 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:49,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:49,069 INFO L82 PathProgramCache]: Analyzing trace with hash -1242233814, now seen corresponding path program 2 times [2021-05-02 17:51:49,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:49,070 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439364819] [2021-05-02 17:51:49,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:49,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:49,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:49,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:49,188 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 17:51:49,188 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:49,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439364819] [2021-05-02 17:51:49,188 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [439364819] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:49,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1374488210] [2021-05-02 17:51:49,189 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 17:51:49,258 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:51:49,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:51:49,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 17:51:49,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:49,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,378 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 17:51:49,379 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1374488210] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:49,379 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:49,379 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 17:51:49,379 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331838330] [2021-05-02 17:51:49,379 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:51:49,380 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:49,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:51:49,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:51:49,380 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:49,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:49,451 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2021-05-02 17:51:49,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:51:49,451 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-02 17:51:49,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:49,452 INFO L225 Difference]: With dead ends: 29 [2021-05-02 17:51:49,452 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 17:51:49,453 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 37.1ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:51:49,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 17:51:49,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-05-02 17:51:49,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:49,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-05-02 17:51:49,456 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 22 [2021-05-02 17:51:49,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:49,457 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-05-02 17:51:49,457 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:49,457 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-05-02 17:51:49,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 17:51:49,457 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:49,458 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:49,673 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:49,673 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:49,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:49,674 INFO L82 PathProgramCache]: Analyzing trace with hash -342908786, now seen corresponding path program 3 times [2021-05-02 17:51:49,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:49,674 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1554212679] [2021-05-02 17:51:49,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:49,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:49,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:49,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:49,777 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 17:51:49,777 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:49,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1554212679] [2021-05-02 17:51:49,778 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1554212679] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:49,778 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [103567364] [2021-05-02 17:51:49,778 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:49,863 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 17:51:49,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:51:49,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 17:51:49,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:49,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:49,972 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 17:51:49,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [103567364] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:49,973 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:49,973 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 17:51:49,973 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183047978] [2021-05-02 17:51:49,976 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:51:49,976 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:49,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:51:49,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:51:49,977 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:50,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:50,046 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2021-05-02 17:51:50,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:51:50,046 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 17:51:50,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:50,048 INFO L225 Difference]: With dead ends: 33 [2021-05-02 17:51:50,048 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 17:51:50,049 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 55.2ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:51:50,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 17:51:50,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2021-05-02 17:51:50,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:50,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-05-02 17:51:50,057 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 26 [2021-05-02 17:51:50,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:50,057 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-05-02 17:51:50,058 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:50,058 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-05-02 17:51:50,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 17:51:50,059 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:50,059 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:50,273 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:50,273 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:50,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:50,273 INFO L82 PathProgramCache]: Analyzing trace with hash -1216277774, now seen corresponding path program 4 times [2021-05-02 17:51:50,274 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:50,274 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607217338] [2021-05-02 17:51:50,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:50,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:50,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:50,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:50,359 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 17:51:50,359 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:50,359 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607217338] [2021-05-02 17:51:50,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [607217338] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:50,359 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1544312147] [2021-05-02 17:51:50,360 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:50,421 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:51:50,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:51:50,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 17:51:50,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:50,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:50,515 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 17:51:50,515 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1544312147] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:50,515 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:50,515 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 17:51:50,515 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999564717] [2021-05-02 17:51:50,516 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:51:50,516 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:50,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:51:50,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:51:50,518 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:50,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:50,597 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2021-05-02 17:51:50,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:51:50,598 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-02 17:51:50,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:50,601 INFO L225 Difference]: With dead ends: 37 [2021-05-02 17:51:50,601 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 17:51:50,601 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 51.0ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:51:50,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 17:51:50,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2021-05-02 17:51:50,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:50,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-05-02 17:51:50,611 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 30 [2021-05-02 17:51:50,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:50,611 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-05-02 17:51:50,614 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:50,614 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-05-02 17:51:50,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 17:51:50,615 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:50,615 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:50,815 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:50,816 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:50,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:50,816 INFO L82 PathProgramCache]: Analyzing trace with hash -198943914, now seen corresponding path program 5 times [2021-05-02 17:51:50,817 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:50,817 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1272194747] [2021-05-02 17:51:50,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:50,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:50,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:50,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:50,916 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 17:51:50,916 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:50,916 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1272194747] [2021-05-02 17:51:50,916 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1272194747] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:50,916 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1128051987] [2021-05-02 17:51:50,917 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:51,310 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 17:51:51,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:51:51,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 17:51:51,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:51,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,383 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 17:51:51,383 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1128051987] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:51,383 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:51,383 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 17:51:51,384 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133094529] [2021-05-02 17:51:51,384 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:51:51,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:51,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:51:51,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:51:51,385 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:51,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:51,441 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2021-05-02 17:51:51,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:51:51,441 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 17:51:51,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:51,442 INFO L225 Difference]: With dead ends: 41 [2021-05-02 17:51:51,442 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 17:51:51,442 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 55.8ms TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:51:51,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 17:51:51,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2021-05-02 17:51:51,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:51,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-05-02 17:51:51,445 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2021-05-02 17:51:51,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:51,445 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-05-02 17:51:51,445 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:51,445 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-05-02 17:51:51,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 17:51:51,446 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:51,446 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:51,669 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 17:51:51,670 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:51,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:51,670 INFO L82 PathProgramCache]: Analyzing trace with hash 1087666618, now seen corresponding path program 6 times [2021-05-02 17:51:51,670 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:51,670 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683295641] [2021-05-02 17:51:51,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:51,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:51,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:51,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:51,766 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 17:51:51,766 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:51,766 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683295641] [2021-05-02 17:51:51,766 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683295641] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:51,766 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [88215361] [2021-05-02 17:51:51,766 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:51,952 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 17:51:51,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:51:51,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 17:51:51,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:51,995 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:51,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,052 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 17:51:52,052 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [88215361] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:52,052 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:52,052 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 17:51:52,052 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472170797] [2021-05-02 17:51:52,053 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:51:52,053 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:52,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:51:52,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:51:52,053 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:52,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:52,135 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2021-05-02 17:51:52,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:51:52,136 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 17:51:52,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:52,138 INFO L225 Difference]: With dead ends: 45 [2021-05-02 17:51:52,138 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 17:51:52,139 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 64.3ms TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:51:52,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 17:51:52,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2021-05-02 17:51:52,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:52,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2021-05-02 17:51:52,147 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 38 [2021-05-02 17:51:52,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:52,148 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2021-05-02 17:51:52,148 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:52,148 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2021-05-02 17:51:52,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 17:51:52,149 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:52,149 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:52,362 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:52,362 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:52,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:52,362 INFO L82 PathProgramCache]: Analyzing trace with hash -504599010, now seen corresponding path program 7 times [2021-05-02 17:51:52,363 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:52,363 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139389552] [2021-05-02 17:51:52,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:52,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:52,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:52,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:52,462 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 17:51:52,462 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:52,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139389552] [2021-05-02 17:51:52,462 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1139389552] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:52,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411940616] [2021-05-02 17:51:52,462 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:52,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:52,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 17:51:52,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:52,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:52,618 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 17:51:52,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1411940616] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:52,619 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:52,619 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 17:51:52,621 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911742408] [2021-05-02 17:51:52,622 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 17:51:52,624 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:52,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 17:51:52,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:51:52,625 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:52,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:52,732 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2021-05-02 17:51:52,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:51:52,732 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 17:51:52,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:52,733 INFO L225 Difference]: With dead ends: 49 [2021-05-02 17:51:52,733 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 17:51:52,733 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 63.3ms TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:51:52,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 17:51:52,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2021-05-02 17:51:52,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:52,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2021-05-02 17:51:52,736 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 42 [2021-05-02 17:51:52,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:52,736 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2021-05-02 17:51:52,736 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:52,737 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2021-05-02 17:51:52,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 17:51:52,737 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:52,737 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:52,937 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:52,938 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:52,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:52,938 INFO L82 PathProgramCache]: Analyzing trace with hash -1597556606, now seen corresponding path program 8 times [2021-05-02 17:51:52,938 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:52,938 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643164372] [2021-05-02 17:51:52,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:52,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:53,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:53,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:53,050 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 17:51:53,050 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:53,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643164372] [2021-05-02 17:51:53,050 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643164372] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:53,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435907259] [2021-05-02 17:51:53,050 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:53,114 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:51:53,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:51:53,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 17:51:53,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:53,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:53,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:53,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:53,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:53,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:53,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:53,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:53,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:53,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:53,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:53,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:53,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:53,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:53,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:53,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:53,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:53,218 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 17:51:53,219 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435907259] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:53,219 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:53,219 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 17:51:53,219 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010791057] [2021-05-02 17:51:53,220 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 17:51:53,220 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:53,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 17:51:53,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:51:53,220 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:53,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:53,306 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2021-05-02 17:51:53,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 17:51:53,306 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2021-05-02 17:51:53,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:53,307 INFO L225 Difference]: With dead ends: 53 [2021-05-02 17:51:53,307 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 17:51:53,307 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 69.4ms TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:51:53,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 17:51:53,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2021-05-02 17:51:53,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:53,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2021-05-02 17:51:53,310 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 46 [2021-05-02 17:51:53,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:53,310 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2021-05-02 17:51:53,310 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:53,310 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2021-05-02 17:51:53,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 17:51:53,311 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:53,311 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:53,524 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 17:51:53,525 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:53,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:53,526 INFO L82 PathProgramCache]: Analyzing trace with hash -1413490458, now seen corresponding path program 9 times [2021-05-02 17:51:53,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:53,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311128674] [2021-05-02 17:51:53,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:53,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:53,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:53,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:53,644 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 17:51:53,644 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:53,644 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311128674] [2021-05-02 17:51:53,644 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1311128674] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:53,644 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794251949] [2021-05-02 17:51:53,644 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:54,487 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 17:51:54,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:51:54,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 17:51:54,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:54,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:54,607 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 17:51:54,607 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1794251949] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:54,607 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:54,608 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 17:51:54,608 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989866567] [2021-05-02 17:51:54,608 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 17:51:54,608 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:54,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 17:51:54,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:51:54,609 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:54,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:54,706 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2021-05-02 17:51:54,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 17:51:54,707 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 17:51:54,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:54,709 INFO L225 Difference]: With dead ends: 57 [2021-05-02 17:51:54,709 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 17:51:54,710 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 83.6ms TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:51:54,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 17:51:54,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2021-05-02 17:51:54,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:54,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2021-05-02 17:51:54,723 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 50 [2021-05-02 17:51:54,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:54,724 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2021-05-02 17:51:54,724 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:54,724 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2021-05-02 17:51:54,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 17:51:54,724 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:54,725 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:54,925 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:54,925 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:54,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:54,926 INFO L82 PathProgramCache]: Analyzing trace with hash 1982943050, now seen corresponding path program 10 times [2021-05-02 17:51:54,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:54,926 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646007580] [2021-05-02 17:51:54,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:54,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:55,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:55,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:55,092 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 17:51:55,092 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:55,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646007580] [2021-05-02 17:51:55,093 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [646007580] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:55,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [955815311] [2021-05-02 17:51:55,093 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:55,173 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:51:55,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:51:55,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 17:51:55,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:51:55,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:51:55,278 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 17:51:55,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [955815311] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:55,279 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:51:55,279 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 17:51:55,279 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646047006] [2021-05-02 17:51:55,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 17:51:55,280 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:51:55,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 17:51:55,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:51:55,280 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 14 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:55,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:51:55,379 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2021-05-02 17:51:55,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 17:51:55,380 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 14 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-02 17:51:55,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:51:55,380 INFO L225 Difference]: With dead ends: 61 [2021-05-02 17:51:55,380 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 17:51:55,381 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 105.7ms TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:51:55,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 17:51:55,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2021-05-02 17:51:55,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:55,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-05-02 17:51:55,383 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2021-05-02 17:51:55,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:51:55,384 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-05-02 17:51:55,384 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 14 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:51:55,384 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-05-02 17:51:55,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 17:51:55,384 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:51:55,384 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:51:55,597 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:51:55,597 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:51:55,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:51:55,598 INFO L82 PathProgramCache]: Analyzing trace with hash -1737057362, now seen corresponding path program 11 times [2021-05-02 17:51:55,598 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:51:55,598 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [494417523] [2021-05-02 17:51:55,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:51:55,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:55,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:51:55,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:51:55,739 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 17:51:55,739 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:51:55,739 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [494417523] [2021-05-02 17:51:55,739 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [494417523] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:51:55,739 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [519445762] [2021-05-02 17:51:55,739 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:20,412 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-02 17:52:20,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:20,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 17:52:20,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:20,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,605 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 17:52:20,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [519445762] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:20,605 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:20,606 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 17:52:20,607 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164689447] [2021-05-02 17:52:20,607 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 17:52:20,607 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:20,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 17:52:20,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:52:20,608 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:20,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:20,711 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2021-05-02 17:52:20,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 17:52:20,712 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2021-05-02 17:52:20,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:20,712 INFO L225 Difference]: With dead ends: 65 [2021-05-02 17:52:20,712 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 17:52:20,712 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 101.6ms TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:52:20,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 17:52:20,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2021-05-02 17:52:20,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:20,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2021-05-02 17:52:20,715 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 58 [2021-05-02 17:52:20,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:20,715 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2021-05-02 17:52:20,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:20,715 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2021-05-02 17:52:20,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 17:52:20,716 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:20,716 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:20,925 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 17:52:20,925 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:20,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:20,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1343570414, now seen corresponding path program 12 times [2021-05-02 17:52:20,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:20,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027662517] [2021-05-02 17:52:20,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:20,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:21,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:21,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:21,105 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 17:52:21,106 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:21,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027662517] [2021-05-02 17:52:21,106 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1027662517] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:21,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [160539869] [2021-05-02 17:52:21,106 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:27,616 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 17:52:27,617 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:27,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 17:52:27,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:27,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,808 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 23 proven. 144 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 17:52:27,808 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [160539869] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:27,808 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:27,808 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17] total 19 [2021-05-02 17:52:27,809 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968428231] [2021-05-02 17:52:27,809 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 17:52:27,810 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:27,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 17:52:27,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:52:27,810 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 18 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:27,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:27,929 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2021-05-02 17:52:27,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 17:52:27,930 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 18 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-02 17:52:27,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:27,930 INFO L225 Difference]: With dead ends: 71 [2021-05-02 17:52:27,930 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 17:52:27,931 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 147.6ms TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:52:27,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 17:52:27,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-02 17:52:27,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:27,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2021-05-02 17:52:27,935 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 62 [2021-05-02 17:52:27,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:27,935 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2021-05-02 17:52:27,935 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 18 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:27,935 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2021-05-02 17:52:27,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-02 17:52:27,938 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:27,939 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:28,141 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 17:52:28,141 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:28,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:28,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1932819238, now seen corresponding path program 13 times [2021-05-02 17:52:28,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:28,141 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927755068] [2021-05-02 17:52:28,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:28,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:28,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:28,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:28,371 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 17:52:28,371 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:28,371 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927755068] [2021-05-02 17:52:28,371 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927755068] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:28,371 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [218088213] [2021-05-02 17:52:28,371 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:28,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:28,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 17:52:28,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:28,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,503 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,513 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,571 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 17:52:28,571 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [218088213] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:28,571 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:28,571 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 17:52:28,571 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691363289] [2021-05-02 17:52:28,572 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 17:52:28,572 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:28,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 17:52:28,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:52:28,573 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:28,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:28,695 INFO L93 Difference]: Finished difference Result 77 states and 78 transitions. [2021-05-02 17:52:28,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 17:52:28,695 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2021-05-02 17:52:28,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:28,695 INFO L225 Difference]: With dead ends: 77 [2021-05-02 17:52:28,695 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 17:52:28,696 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 145.7ms TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:52:28,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 17:52:28,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2021-05-02 17:52:28,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:28,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2021-05-02 17:52:28,701 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 70 [2021-05-02 17:52:28,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:28,701 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2021-05-02 17:52:28,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:28,701 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2021-05-02 17:52:28,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 17:52:28,702 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:28,702 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:28,912 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 17:52:28,913 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:28,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:28,913 INFO L82 PathProgramCache]: Analyzing trace with hash -2047989442, now seen corresponding path program 14 times [2021-05-02 17:52:28,913 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:28,913 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559202404] [2021-05-02 17:52:28,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:28,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:29,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:29,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:29,088 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 17:52:29,088 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:29,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559202404] [2021-05-02 17:52:29,088 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559202404] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:29,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [482254561] [2021-05-02 17:52:29,088 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:29,160 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:52:29,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:29,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 17:52:29,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:29,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:29,285 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 17:52:29,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [482254561] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:29,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:29,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 17:52:29,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074208437] [2021-05-02 17:52:29,286 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 17:52:29,286 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:29,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 17:52:29,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-02 17:52:29,287 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:29,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:29,413 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2021-05-02 17:52:29,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 17:52:29,413 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-02 17:52:29,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:29,414 INFO L225 Difference]: With dead ends: 81 [2021-05-02 17:52:29,414 INFO L226 Difference]: Without dead ends: 81 [2021-05-02 17:52:29,414 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 137.4ms TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-02 17:52:29,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-02 17:52:29,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2021-05-02 17:52:29,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:29,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2021-05-02 17:52:29,416 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2021-05-02 17:52:29,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:29,417 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2021-05-02 17:52:29,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:29,417 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2021-05-02 17:52:29,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 17:52:29,417 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:29,418 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:29,640 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:29,640 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:29,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:29,641 INFO L82 PathProgramCache]: Analyzing trace with hash -1683250270, now seen corresponding path program 15 times [2021-05-02 17:52:29,641 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:29,641 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294410535] [2021-05-02 17:52:29,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:29,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:29,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:29,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:29,875 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 17:52:29,876 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:29,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294410535] [2021-05-02 17:52:29,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1294410535] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:29,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177423676] [2021-05-02 17:52:29,876 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:41,758 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-02 17:52:41,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:41,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 17:52:41,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:41,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:41,925 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 17:52:41,925 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1177423676] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:41,926 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:41,926 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 17:52:41,926 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329134329] [2021-05-02 17:52:41,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 17:52:41,926 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:41,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 17:52:41,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-02 17:52:41,927 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 21 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 20 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:42,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:42,039 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2021-05-02 17:52:42,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 17:52:42,040 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 20 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 78 [2021-05-02 17:52:42,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:42,040 INFO L225 Difference]: With dead ends: 85 [2021-05-02 17:52:42,040 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 17:52:42,040 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 173.0ms TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-02 17:52:42,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 17:52:42,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2021-05-02 17:52:42,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:42,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2021-05-02 17:52:42,042 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 78 [2021-05-02 17:52:42,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:42,042 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2021-05-02 17:52:42,043 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 20 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:42,043 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2021-05-02 17:52:42,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-02 17:52:42,043 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:42,043 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:42,244 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 17:52:42,244 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:42,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:42,245 INFO L82 PathProgramCache]: Analyzing trace with hash -1537281018, now seen corresponding path program 16 times [2021-05-02 17:52:42,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:42,245 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903504354] [2021-05-02 17:52:42,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:42,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:42,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:42,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:42,515 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-02 17:52:42,516 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:42,516 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903504354] [2021-05-02 17:52:42,516 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1903504354] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:42,516 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [218162479] [2021-05-02 17:52:42,516 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:42,603 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:52:42,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:42,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 17:52:42,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:42,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,638 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,662 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,786 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-02 17:52:42,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [218162479] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:42,786 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:42,787 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 17:52:42,787 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57804194] [2021-05-02 17:52:42,787 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 17:52:42,787 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:42,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 17:52:42,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-02 17:52:42,788 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:42,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:42,923 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2021-05-02 17:52:42,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 17:52:42,924 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 82 [2021-05-02 17:52:42,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:42,924 INFO L225 Difference]: With dead ends: 89 [2021-05-02 17:52:42,924 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 17:52:42,925 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 195.4ms TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-02 17:52:42,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 17:52:42,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2021-05-02 17:52:42,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:42,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2021-05-02 17:52:42,927 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 82 [2021-05-02 17:52:42,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:42,927 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2021-05-02 17:52:42,927 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:42,928 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2021-05-02 17:52:42,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 17:52:42,928 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:42,928 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:43,147 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 17:52:43,148 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:43,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:43,148 INFO L82 PathProgramCache]: Analyzing trace with hash -1151133078, now seen corresponding path program 17 times [2021-05-02 17:52:43,148 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:43,148 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811641896] [2021-05-02 17:52:43,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:43,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:43,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:43,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:43,401 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2021-05-02 17:52:43,402 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:43,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811641896] [2021-05-02 17:52:43,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811641896] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:43,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1408269316] [2021-05-02 17:52:43,402 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true