/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-invgen/nested6.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:08:37,420 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:08:37,422 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:08:37,466 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 18:08:37,526 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:08:37,526 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:08:37,538 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:08:37,542 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:08:37,562 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:08:37,562 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:08:37,565 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:08:37,565 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:08:37,565 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:08:37,565 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:08:37,565 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:08:37,566 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:08:37,566 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:08:37,566 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:08:37,566 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:08:37,566 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:08:37,566 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:08:37,566 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:08:37,567 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:08:37,567 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:08:37,567 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:08:37,567 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:08:37,567 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:08:37,567 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:08:37,568 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:08:37,569 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:08:37,569 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:08:37,854 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:08:37,884 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:08:37,887 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:08:37,888 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:08:37,888 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:08:37,889 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/nested6.i [2021-05-02 18:08:37,942 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b06918751/5640279f1f47431aa10edc8af5fa1e6b/FLAG5258a947a [2021-05-02 18:08:38,385 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:08:38,386 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/nested6.i [2021-05-02 18:08:38,392 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b06918751/5640279f1f47431aa10edc8af5fa1e6b/FLAG5258a947a [2021-05-02 18:08:38,413 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b06918751/5640279f1f47431aa10edc8af5fa1e6b [2021-05-02 18:08:38,418 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:08:38,420 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:08:38,422 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:08:38,422 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:08:38,425 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:08:38,426 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:08:38" (1/1) ... [2021-05-02 18:08:38,427 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d5077f0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:08:38, skipping insertion in model container [2021-05-02 18:08:38,427 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:08:38" (1/1) ... [2021-05-02 18:08:38,433 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:08:38,447 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:08:38,545 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-invgen/nested6.i[893,906] [2021-05-02 18:08:38,555 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:08:38,563 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:08:38,611 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-invgen/nested6.i[893,906] [2021-05-02 18:08:38,620 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:08:38,634 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:08:38,635 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:08:38 WrapperNode [2021-05-02 18:08:38,635 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:08:38,638 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:08:38,638 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:08:38,638 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:08:38,647 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:08:38" (1/1) ... [2021-05-02 18:08:38,648 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:08:38" (1/1) ... [2021-05-02 18:08:38,655 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:08:38" (1/1) ... [2021-05-02 18:08:38,655 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:08:38" (1/1) ... [2021-05-02 18:08:38,668 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:08:38" (1/1) ... [2021-05-02 18:08:38,672 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:08:38" (1/1) ... [2021-05-02 18:08:38,673 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:08:38" (1/1) ... [2021-05-02 18:08:38,675 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:08:38,676 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:08:38,676 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:08:38,676 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:08:38,679 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:08:38" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:08:38,746 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:08:38,747 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:08:38,747 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:08:38,747 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 18:08:38,747 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:08:38,748 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:08:38,748 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:08:38,748 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:08:38,748 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 18:08:38,749 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 18:08:38,749 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:08:38,749 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:08:38,749 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 18:08:38,750 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:08:38,750 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 18:08:38,750 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:08:38,750 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:08:38,750 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:08:38,751 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:08:38,751 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:08:38,753 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:08:38,753 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:08:39,060 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:08:39,060 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-05-02 18:08:39,061 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:08:39 BoogieIcfgContainer [2021-05-02 18:08:39,061 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:08:39,062 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:08:39,062 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:08:39,062 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:08:39,065 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:08:39" (1/1) ... [2021-05-02 18:08:39,079 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:08:39 BasicIcfg [2021-05-02 18:08:39,079 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:08:39,080 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:08:39,092 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:08:39,095 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:08:39,095 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:08:38" (1/4) ... [2021-05-02 18:08:39,096 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c44577f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:08:39, skipping insertion in model container [2021-05-02 18:08:39,096 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:08:38" (2/4) ... [2021-05-02 18:08:39,096 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c44577f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:08:39, skipping insertion in model container [2021-05-02 18:08:39,097 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:08:39" (3/4) ... [2021-05-02 18:08:39,097 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c44577f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:08:39, skipping insertion in model container [2021-05-02 18:08:39,097 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:08:39" (4/4) ... [2021-05-02 18:08:39,098 INFO L111 eAbstractionObserver]: Analyzing ICFG nested6.iJordan [2021-05-02 18:08:39,102 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:08:39,106 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:08:39,127 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:08:39,151 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:08:39,151 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:08:39,151 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:08:39,152 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:08:39,152 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:08:39,152 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:08:39,152 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:08:39,152 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:08:39,168 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 20 states have (on average 1.55) internal successors, (31), 22 states have internal predecessors, (31), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:08:39,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 18:08:39,175 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:08:39,175 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:08:39,176 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:08:39,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:08:39,182 INFO L82 PathProgramCache]: Analyzing trace with hash -1002152396, now seen corresponding path program 1 times [2021-05-02 18:08:39,189 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:08:39,190 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1229222142] [2021-05-02 18:08:39,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:08:39,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:39,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:08:39,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:39,453 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:08:39,453 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:08:39,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1229222142] [2021-05-02 18:08:39,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1229222142] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:08:39,454 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:08:39,455 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 18:08:39,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154380932] [2021-05-02 18:08:39,459 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:08:39,459 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:08:39,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:08:39,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:08:39,473 INFO L87 Difference]: Start difference. First operand has 30 states, 20 states have (on average 1.55) internal successors, (31), 22 states have internal predecessors, (31), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:39,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:08:39,690 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2021-05-02 18:08:39,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:08:39,692 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 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 16 [2021-05-02 18:08:39,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:08:39,698 INFO L225 Difference]: With dead ends: 37 [2021-05-02 18:08:39,698 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 18:08:39,699 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 134.2ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:08:39,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 18:08:39,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-02 18:08:39,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 20 states have (on average 1.2) internal successors, (24), 21 states have internal predecessors, (24), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 18:08:39,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2021-05-02 18:08:39,731 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 16 [2021-05-02 18:08:39,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:08:39,731 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2021-05-02 18:08:39,731 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:39,731 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2021-05-02 18:08:39,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 18:08:39,732 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:08:39,732 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:08:39,732 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:08:39,733 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:08:39,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:08:39,733 INFO L82 PathProgramCache]: Analyzing trace with hash -1031567308, now seen corresponding path program 1 times [2021-05-02 18:08:39,733 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:08:39,734 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181099301] [2021-05-02 18:08:39,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:08:39,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:39,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:08:39,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:39,810 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:08:39,810 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:08:39,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181099301] [2021-05-02 18:08:39,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [181099301] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:08:39,811 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:08:39,811 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 18:08:39,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416077268] [2021-05-02 18:08:39,812 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 18:08:39,813 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:08:39,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 18:08:39,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 18:08:39,814 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:40,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:08:40,021 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2021-05-02 18:08:40,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:08:40,022 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 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 17 [2021-05-02 18:08:40,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:08:40,023 INFO L225 Difference]: With dead ends: 39 [2021-05-02 18:08:40,023 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 18:08:40,040 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 121.0ms TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:08:40,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 18:08:40,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 33. [2021-05-02 18:08:40,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 18:08:40,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2021-05-02 18:08:40,046 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 17 [2021-05-02 18:08:40,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:08:40,047 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2021-05-02 18:08:40,047 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:40,047 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2021-05-02 18:08:40,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 18:08:40,048 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:08:40,048 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:08:40,048 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:08:40,048 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:08:40,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:08:40,049 INFO L82 PathProgramCache]: Analyzing trace with hash 1187235258, now seen corresponding path program 1 times [2021-05-02 18:08:40,049 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:08:40,050 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [939949253] [2021-05-02 18:08:40,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:08:40,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:40,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:08:40,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:40,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-05-02 18:08:40,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:40,123 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:08:40,123 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:08:40,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [939949253] [2021-05-02 18:08:40,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [939949253] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:08:40,123 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:08:40,123 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 18:08:40,124 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775992147] [2021-05-02 18:08:40,124 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:08:40,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:08:40,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:08:40,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:08:40,125 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:08:40,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:08:40,297 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2021-05-02 18:08:40,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:08:40,298 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2021-05-02 18:08:40,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:08:40,299 INFO L225 Difference]: With dead ends: 44 [2021-05-02 18:08:40,299 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 18:08:40,299 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 101.2ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:08:40,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 18:08:40,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 18:08:40,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 32 states have internal predecessors, (37), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 18:08:40,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 50 transitions. [2021-05-02 18:08:40,305 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 50 transitions. Word has length 21 [2021-05-02 18:08:40,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:08:40,306 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 50 transitions. [2021-05-02 18:08:40,306 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:08:40,306 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 50 transitions. [2021-05-02 18:08:40,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 18:08:40,307 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:08:40,307 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:08:40,307 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 18:08:40,307 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:08:40,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:08:40,308 INFO L82 PathProgramCache]: Analyzing trace with hash -1420692427, now seen corresponding path program 1 times [2021-05-02 18:08:40,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:08:40,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233417041] [2021-05-02 18:08:40,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:08:40,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:40,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:08:40,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:40,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 18:08:40,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:40,387 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:08:40,388 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:08:40,388 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233417041] [2021-05-02 18:08:40,388 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233417041] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:40,388 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [73467998] [2021-05-02 18:08:40,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:40,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:40,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:08:40,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:08:40,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:40,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:40,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:40,585 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:08:40,586 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [73467998] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:08:40,586 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:08:40,586 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2021-05-02 18:08:40,586 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546037464] [2021-05-02 18:08:40,587 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 18:08:40,587 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:08:40,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 18:08:40,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:08:40,588 INFO L87 Difference]: Start difference. First operand 44 states and 50 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:08:40,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:08:40,655 INFO L93 Difference]: Finished difference Result 72 states and 94 transitions. [2021-05-02 18:08:40,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 18:08:40,655 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2021-05-02 18:08:40,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:08:40,657 INFO L225 Difference]: With dead ends: 72 [2021-05-02 18:08:40,657 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 18:08:40,657 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 90.4ms TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-05-02 18:08:40,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 18:08:40,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 48. [2021-05-02 18:08:40,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 35 states have (on average 1.2) internal successors, (42), 36 states have internal predecessors, (42), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 18:08:40,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 55 transitions. [2021-05-02 18:08:40,664 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 55 transitions. Word has length 25 [2021-05-02 18:08:40,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:08:40,665 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 55 transitions. [2021-05-02 18:08:40,665 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:08:40,665 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 55 transitions. [2021-05-02 18:08:40,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 18:08:40,666 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:08:40,666 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:08:40,890 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:40,891 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:08:40,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:08:40,891 INFO L82 PathProgramCache]: Analyzing trace with hash 1754984885, now seen corresponding path program 1 times [2021-05-02 18:08:40,891 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:08:40,892 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [6027395] [2021-05-02 18:08:40,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:08:40,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:41,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:08:41,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:41,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-05-02 18:08:41,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:41,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-05-02 18:08:41,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:41,068 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:08:41,068 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:08:41,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [6027395] [2021-05-02 18:08:41,068 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [6027395] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:41,069 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1141163618] [2021-05-02 18:08:41,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:41,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:41,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:08:41,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:08:41,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:41,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:41,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:41,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:41,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:41,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:41,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:41,272 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:08:41,273 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1141163618] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:41,273 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:08:41,273 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 14 [2021-05-02 18:08:41,273 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104272029] [2021-05-02 18:08:41,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:08:41,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:08:41,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:08:41,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:08:41,282 INFO L87 Difference]: Start difference. First operand 48 states and 55 transitions. Second operand has 14 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 11 states have internal predecessors, (36), 5 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:08:42,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:08:42,298 INFO L93 Difference]: Finished difference Result 94 states and 121 transitions. [2021-05-02 18:08:42,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 18:08:42,298 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 11 states have internal predecessors, (36), 5 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 32 [2021-05-02 18:08:42,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:08:42,299 INFO L225 Difference]: With dead ends: 94 [2021-05-02 18:08:42,300 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 18:08:42,300 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 791.8ms TimeCoverageRelationStatistics Valid=231, Invalid=959, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 18:08:42,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 18:08:42,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 66. [2021-05-02 18:08:42,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 48 states have (on average 1.25) internal successors, (60), 50 states have internal predecessors, (60), 12 states have call successors, (12), 6 states have call predecessors, (12), 5 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 18:08:42,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 83 transitions. [2021-05-02 18:08:42,307 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 83 transitions. Word has length 32 [2021-05-02 18:08:42,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:08:42,307 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 83 transitions. [2021-05-02 18:08:42,308 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 11 states have internal predecessors, (36), 5 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 18:08:42,308 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 83 transitions. [2021-05-02 18:08:42,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 18:08:42,309 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:08:42,309 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:08:42,533 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:42,533 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:08:42,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:08:42,534 INFO L82 PathProgramCache]: Analyzing trace with hash -1763990758, now seen corresponding path program 1 times [2021-05-02 18:08:42,534 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:08:42,534 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661073448] [2021-05-02 18:08:42,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:08:42,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:42,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:08:42,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:42,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-05-02 18:08:42,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:42,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-05-02 18:08:42,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:42,670 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 18 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 18:08:42,670 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:08:42,670 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661073448] [2021-05-02 18:08:42,670 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [661073448] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:42,670 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1979320223] [2021-05-02 18:08:42,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:42,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:42,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 18:08:42,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:08:42,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:42,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:42,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:42,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:42,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:42,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:42,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:42,892 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:42,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:42,940 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 20 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 18:08:42,941 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1979320223] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:42,941 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:08:42,941 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 15 [2021-05-02 18:08:42,941 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284825222] [2021-05-02 18:08:42,941 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 18:08:42,941 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:08:42,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 18:08:42,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:08:42,942 INFO L87 Difference]: Start difference. First operand 66 states and 83 transitions. Second operand has 15 states, 15 states have (on average 2.933333333333333) internal successors, (44), 14 states have internal predecessors, (44), 4 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 18:08:43,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:08:43,375 INFO L93 Difference]: Finished difference Result 86 states and 110 transitions. [2021-05-02 18:08:43,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:08:43,376 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.933333333333333) internal successors, (44), 14 states have internal predecessors, (44), 4 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 42 [2021-05-02 18:08:43,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:08:43,378 INFO L225 Difference]: With dead ends: 86 [2021-05-02 18:08:43,378 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 18:08:43,378 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 353.0ms TimeCoverageRelationStatistics Valid=116, Invalid=346, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:08:43,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 18:08:43,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 71. [2021-05-02 18:08:43,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 52 states have (on average 1.25) internal successors, (65), 54 states have internal predecessors, (65), 13 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 18:08:43,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 90 transitions. [2021-05-02 18:08:43,400 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 90 transitions. Word has length 42 [2021-05-02 18:08:43,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:08:43,400 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 90 transitions. [2021-05-02 18:08:43,400 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.933333333333333) internal successors, (44), 14 states have internal predecessors, (44), 4 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 18:08:43,400 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 90 transitions. [2021-05-02 18:08:43,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 18:08:43,401 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:08:43,401 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:08:43,602 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:43,602 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:08:43,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:08:43,602 INFO L82 PathProgramCache]: Analyzing trace with hash 1192666941, now seen corresponding path program 1 times [2021-05-02 18:08:43,603 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:08:43,603 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1086693122] [2021-05-02 18:08:43,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:08:43,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:43,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:08:43,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:43,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-05-02 18:08:43,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:43,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 18:08:43,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:43,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-05-02 18:08:43,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:43,688 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:08:43,688 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:08:43,688 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1086693122] [2021-05-02 18:08:43,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1086693122] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:43,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964733988] [2021-05-02 18:08:43,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:43,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:43,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 18:08:43,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:08:43,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:43,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:43,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:43,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:43,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:43,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:43,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:43,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:43,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:43,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:43,913 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 26 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 18:08:43,913 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [964733988] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:43,913 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:08:43,914 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2021-05-02 18:08:43,914 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28774381] [2021-05-02 18:08:43,914 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 18:08:43,914 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:08:43,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 18:08:43,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2021-05-02 18:08:43,915 INFO L87 Difference]: Start difference. First operand 71 states and 90 transitions. Second operand has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 12 states have internal predecessors, (38), 4 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-05-02 18:08:44,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:08:44,219 INFO L93 Difference]: Finished difference Result 95 states and 125 transitions. [2021-05-02 18:08:44,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:08:44,220 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 12 states have internal predecessors, (38), 4 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 44 [2021-05-02 18:08:44,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:08:44,221 INFO L225 Difference]: With dead ends: 95 [2021-05-02 18:08:44,221 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 18:08:44,221 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 198.2ms TimeCoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:08:44,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 18:08:44,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 78. [2021-05-02 18:08:44,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 56 states have (on average 1.25) internal successors, (70), 59 states have internal predecessors, (70), 16 states have call successors, (16), 6 states have call predecessors, (16), 5 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 18:08:44,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 101 transitions. [2021-05-02 18:08:44,227 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 101 transitions. Word has length 44 [2021-05-02 18:08:44,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:08:44,227 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 101 transitions. [2021-05-02 18:08:44,227 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 12 states have internal predecessors, (38), 4 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-05-02 18:08:44,227 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 101 transitions. [2021-05-02 18:08:44,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 18:08:44,229 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:08:44,229 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:08:44,448 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:44,449 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:08:44,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:08:44,449 INFO L82 PathProgramCache]: Analyzing trace with hash 1839163900, now seen corresponding path program 1 times [2021-05-02 18:08:44,449 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:08:44,450 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583638345] [2021-05-02 18:08:44,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:08:44,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:44,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:08:44,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:44,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-05-02 18:08:44,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:44,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 18:08:44,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:44,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-05-02 18:08:44,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:44,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-05-02 18:08:44,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:44,531 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 29 proven. 1 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-05-02 18:08:44,535 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:08:44,535 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583638345] [2021-05-02 18:08:44,535 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [583638345] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:44,535 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2067553836] [2021-05-02 18:08:44,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:44,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:44,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 18:08:44,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:08:44,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:44,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:44,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:44,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:44,644 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:44,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:44,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:44,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:44,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:44,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:44,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:44,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:44,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:44,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:44,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:44,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:44,795 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:08:44,796 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2067553836] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:44,796 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:08:44,796 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 14 [2021-05-02 18:08:44,796 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749305572] [2021-05-02 18:08:44,796 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:08:44,797 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:08:44,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:08:44,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:08:44,797 INFO L87 Difference]: Start difference. First operand 78 states and 101 transitions. Second operand has 14 states, 14 states have (on average 4.142857142857143) internal successors, (58), 12 states have internal predecessors, (58), 5 states have call successors, (13), 4 states have call predecessors, (13), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2021-05-02 18:08:45,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:08:45,887 INFO L93 Difference]: Finished difference Result 123 states and 169 transitions. [2021-05-02 18:08:45,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 18:08:45,888 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.142857142857143) internal successors, (58), 12 states have internal predecessors, (58), 5 states have call successors, (13), 4 states have call predecessors, (13), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) Word has length 55 [2021-05-02 18:08:45,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:08:45,888 INFO L225 Difference]: With dead ends: 123 [2021-05-02 18:08:45,888 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 18:08:45,889 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 788.2ms TimeCoverageRelationStatistics Valid=302, Invalid=1180, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 18:08:45,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 18:08:45,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 18:08:45,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 18:08:45,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 18:08:45,889 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 55 [2021-05-02 18:08:45,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:08:45,891 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 18:08:45,891 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 4.142857142857143) internal successors, (58), 12 states have internal predecessors, (58), 5 states have call successors, (13), 4 states have call predecessors, (13), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2021-05-02 18:08:45,891 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 18:08:45,891 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 18:08:46,110 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:46,113 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:08:46 BasicIcfg [2021-05-02 18:08:46,113 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 18:08:46,114 INFO L168 Benchmark]: Toolchain (without parser) took 7694.25 ms. Allocated memory was 184.5 MB in the beginning and 276.8 MB in the end (delta: 92.3 MB). Free memory was 149.6 MB in the beginning and 239.6 MB in the end (delta: -90.0 MB). Peak memory consumption was 2.8 MB. Max. memory is 8.0 GB. [2021-05-02 18:08:46,114 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 184.5 MB. Free memory is still 166.3 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 18:08:46,114 INFO L168 Benchmark]: CACSL2BoogieTranslator took 213.61 ms. Allocated memory is still 184.5 MB. Free memory was 149.4 MB in the beginning and 168.0 MB in the end (delta: -18.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 8.0 GB. [2021-05-02 18:08:46,114 INFO L168 Benchmark]: Boogie Preprocessor took 37.04 ms. Allocated memory is still 184.5 MB. Free memory was 168.0 MB in the beginning and 166.4 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 18:08:46,114 INFO L168 Benchmark]: RCFGBuilder took 385.73 ms. Allocated memory is still 184.5 MB. Free memory was 166.4 MB in the beginning and 150.6 MB in the end (delta: 15.7 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. [2021-05-02 18:08:46,115 INFO L168 Benchmark]: IcfgTransformer took 17.16 ms. Allocated memory is still 184.5 MB. Free memory was 150.3 MB in the beginning and 149.1 MB in the end (delta: 1.1 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 18:08:46,115 INFO L168 Benchmark]: TraceAbstraction took 7033.40 ms. Allocated memory was 184.5 MB in the beginning and 276.8 MB in the end (delta: 92.3 MB). Free memory was 148.5 MB in the beginning and 239.6 MB in the end (delta: -91.1 MB). Peak memory consumption was 1.7 MB. Max. memory is 8.0 GB. [2021-05-02 18:08:46,115 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 184.5 MB. Free memory is still 166.3 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 213.61 ms. Allocated memory is still 184.5 MB. Free memory was 149.4 MB in the beginning and 168.0 MB in the end (delta: -18.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 37.04 ms. Allocated memory is still 184.5 MB. Free memory was 168.0 MB in the beginning and 166.4 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 385.73 ms. Allocated memory is still 184.5 MB. Free memory was 166.4 MB in the beginning and 150.6 MB in the end (delta: 15.7 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. * IcfgTransformer took 17.16 ms. Allocated memory is still 184.5 MB. Free memory was 150.3 MB in the beginning and 149.1 MB in the end (delta: 1.1 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 7033.40 ms. Allocated memory was 184.5 MB in the beginning and 276.8 MB in the end (delta: 92.3 MB). Free memory was 148.5 MB in the beginning and 239.6 MB in the end (delta: -91.1 MB). Peak memory consumption was 1.7 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 19]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 30 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 6961.4ms, OverallIterations: 8, TraceHistogramMax: 5, EmptinessCheckTime: 18.7ms, AutomataDifference: 3554.5ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 10.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 176 SDtfs, 459 SDslu, 337 SDs, 0 SdLazy, 1339 SolverSat, 397 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1107.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 366 GetRequests, 223 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 719 ImplicationChecksByTransitivity, 2578.4ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=78occurred in iteration=7, InterpolantAutomatonStates: 97, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 70.1ms AutomataMinimizationTime, 8 MinimizatonAttempts, 84 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 57.7ms SsaConstructionTime, 225.3ms SatisfiabilityAnalysisTime, 1659.8ms InterpolantComputationTime, 450 NumberOfCodeBlocks, 450 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 437 ConstructedInterpolants, 0 QuantifiedInterpolants, 1323 SizeOfPredicates, 17 NumberOfNonLiveVariables, 675 ConjunctsInSsa, 31 ConjunctsInUnsatCore, 13 InterpolantComputations, 4 PerfectInterpolantSequences, 270/296 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...