/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-06 22:45:10,068 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-06 22:45:10,074 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-06 22:45:10,131 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-06 22:45:10,132 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-06 22:45:10,136 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-06 22:45:10,139 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-06 22:45:10,147 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-06 22:45:10,158 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-06 22:45:10,161 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-06 22:45:10,162 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-06 22:45:10,163 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-06 22:45:10,163 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-06 22:45:10,169 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-06 22:45:10,170 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-06 22:45:10,173 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-06 22:45:10,174 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-06 22:45:10,178 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-06 22:45:10,184 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-06 22:45:10,187 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-06 22:45:10,192 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-06 22:45:10,194 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-06 22:45:10,195 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-06 22:45:10,197 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-06 22:45:10,207 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-06 22:45:10,219 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-06 22:45:10,220 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-06 22:45:10,221 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-06 22:45:10,222 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-06 22:45:10,275 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-06 22:45:10,275 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-06 22:45:10,279 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-06 22:45:10,280 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-06 22:45:10,280 INFO L138 SettingsManager]: * Use SBE=true [2020-11-06 22:45:10,280 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-06 22:45:10,280 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-06 22:45:10,281 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-06 22:45:10,281 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-06 22:45:10,281 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-06 22:45:10,282 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-06 22:45:10,282 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-06 22:45:10,283 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-06 22:45:10,283 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-06 22:45:10,283 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-06 22:45:10,283 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-06 22:45:10,283 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-06 22:45:10,284 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-06 22:45:10,284 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-06 22:45:10,284 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-06 22:45:10,284 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-06 22:45:10,285 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-06 22:45:10,285 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-06 22:45:10,285 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-06 22:45:10,285 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-06 22:45:10,285 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-06 22:45:10,286 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-06 22:45:10,286 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-06 22:45:10,286 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-06 22:45:10,286 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-11-06 22:45:10,696 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-06 22:45:10,732 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-06 22:45:10,735 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-06 22:45:10,737 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-06 22:45:10,737 INFO L275 PluginConnector]: CDTParser initialized [2020-11-06 22:45:10,738 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-1.i [2020-11-06 22:45:10,816 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c81bd676e/604499f63124486a8717984ed936ecf8/FLAGe53562656 [2020-11-06 22:45:11,387 INFO L306 CDTParser]: Found 1 translation units. [2020-11-06 22:45:11,388 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-1.i [2020-11-06 22:45:11,396 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c81bd676e/604499f63124486a8717984ed936ecf8/FLAGe53562656 [2020-11-06 22:45:11,736 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c81bd676e/604499f63124486a8717984ed936ecf8 [2020-11-06 22:45:11,740 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-06 22:45:11,749 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-06 22:45:11,754 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-06 22:45:11,754 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-06 22:45:11,758 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-06 22:45:11,759 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:45:11" (1/1) ... [2020-11-06 22:45:11,767 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@758d80fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:11, skipping insertion in model container [2020-11-06 22:45:11,767 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:45:11" (1/1) ... [2020-11-06 22:45:11,777 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-06 22:45:11,802 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-06 22:45:12,050 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:45:12,059 INFO L203 MainTranslator]: Completed pre-run [2020-11-06 22:45:12,085 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:45:12,102 INFO L208 MainTranslator]: Completed translation [2020-11-06 22:45:12,102 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12 WrapperNode [2020-11-06 22:45:12,103 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-06 22:45:12,104 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-06 22:45:12,104 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-06 22:45:12,104 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-06 22:45:12,117 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (1/1) ... [2020-11-06 22:45:12,117 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (1/1) ... [2020-11-06 22:45:12,125 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (1/1) ... [2020-11-06 22:45:12,126 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (1/1) ... [2020-11-06 22:45:12,136 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (1/1) ... [2020-11-06 22:45:12,142 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (1/1) ... [2020-11-06 22:45:12,144 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (1/1) ... [2020-11-06 22:45:12,147 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-06 22:45:12,148 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-06 22:45:12,148 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-06 22:45:12,148 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-06 22:45:12,149 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (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 [2020-11-06 22:45:12,224 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-06 22:45:12,224 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-06 22:45:12,224 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-06 22:45:12,224 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-11-06 22:45:12,224 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-11-06 22:45:12,225 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-06 22:45:12,225 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-06 22:45:12,225 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-06 22:45:12,225 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2020-11-06 22:45:12,225 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2020-11-06 22:45:12,225 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-06 22:45:12,226 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-06 22:45:12,226 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-11-06 22:45:12,226 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-11-06 22:45:12,226 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-11-06 22:45:12,226 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-06 22:45:12,227 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-06 22:45:12,227 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-06 22:45:12,227 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-06 22:45:12,227 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-06 22:45:12,227 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-06 22:45:12,227 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-06 22:45:12,700 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-06 22:45:12,700 INFO L298 CfgBuilder]: Removed 5 assume(true) statements. [2020-11-06 22:45:12,702 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:45:12 BoogieIcfgContainer [2020-11-06 22:45:12,702 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-06 22:45:12,713 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-06 22:45:12,714 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-06 22:45:12,717 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-06 22:45:12,717 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:45:11" (1/3) ... [2020-11-06 22:45:12,718 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62d28bb7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:45:12, skipping insertion in model container [2020-11-06 22:45:12,718 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (2/3) ... [2020-11-06 22:45:12,719 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62d28bb7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:45:12, skipping insertion in model container [2020-11-06 22:45:12,719 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:45:12" (3/3) ... [2020-11-06 22:45:12,721 INFO L111 eAbstractionObserver]: Analyzing ICFG string-1.i [2020-11-06 22:45:12,736 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-06 22:45:12,740 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-06 22:45:12,753 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-06 22:45:12,781 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-06 22:45:12,782 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-06 22:45:12,782 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-06 22:45:12,782 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-06 22:45:12,782 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-06 22:45:12,782 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-06 22:45:12,783 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-06 22:45:12,783 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-06 22:45:12,801 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2020-11-06 22:45:12,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-11-06 22:45:12,807 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:12,808 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:45:12,809 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:12,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:12,816 INFO L82 PathProgramCache]: Analyzing trace with hash 1881354354, now seen corresponding path program 1 times [2020-11-06 22:45:12,826 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:12,826 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758871220] [2020-11-06 22:45:12,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:12,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:13,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:13,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:13,122 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:45:13,123 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758871220] [2020-11-06 22:45:13,124 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:45:13,124 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-06 22:45:13,125 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961196888] [2020-11-06 22:45:13,130 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-06 22:45:13,131 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:13,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-06 22:45:13,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-06 22:45:13,150 INFO L87 Difference]: Start difference. First operand 40 states. Second operand 4 states. [2020-11-06 22:45:13,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:13,325 INFO L93 Difference]: Finished difference Result 80 states and 119 transitions. [2020-11-06 22:45:13,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-06 22:45:13,327 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 24 [2020-11-06 22:45:13,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:13,337 INFO L225 Difference]: With dead ends: 80 [2020-11-06 22:45:13,337 INFO L226 Difference]: Without dead ends: 38 [2020-11-06 22:45:13,341 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-06 22:45:13,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-11-06 22:45:13,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2020-11-06 22:45:13,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-11-06 22:45:13,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2020-11-06 22:45:13,388 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 24 [2020-11-06 22:45:13,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:13,388 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2020-11-06 22:45:13,388 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-06 22:45:13,389 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2020-11-06 22:45:13,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-11-06 22:45:13,390 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:13,390 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:45:13,391 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-06 22:45:13,391 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:13,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:13,392 INFO L82 PathProgramCache]: Analyzing trace with hash -607743226, now seen corresponding path program 1 times [2020-11-06 22:45:13,392 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:13,393 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [987873421] [2020-11-06 22:45:13,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:13,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:13,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:13,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:13,540 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:45:13,541 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [987873421] [2020-11-06 22:45:13,541 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932686851] [2020-11-06 22:45:13,542 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 [2020-11-06 22:45:13,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:13,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-06 22:45:13,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:45:13,749 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:45:13,749 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:45:13,750 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2020-11-06 22:45:13,751 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065219312] [2020-11-06 22:45:13,751 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-06 22:45:13,752 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:13,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-06 22:45:13,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:45:13,753 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand 6 states. [2020-11-06 22:45:13,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:13,890 INFO L93 Difference]: Finished difference Result 69 states and 84 transitions. [2020-11-06 22:45:13,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-06 22:45:13,891 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 30 [2020-11-06 22:45:13,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:13,892 INFO L225 Difference]: With dead ends: 69 [2020-11-06 22:45:13,892 INFO L226 Difference]: Without dead ends: 46 [2020-11-06 22:45:13,894 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:45:13,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-11-06 22:45:13,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 36. [2020-11-06 22:45:13,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-11-06 22:45:13,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-11-06 22:45:13,904 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 30 [2020-11-06 22:45:13,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:13,904 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-11-06 22:45:13,904 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-06 22:45:13,905 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-11-06 22:45:13,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-11-06 22:45:13,906 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:13,906 INFO L422 BasicCegarLoop]: trace histogram [2, 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, 1, 1, 1] [2020-11-06 22:45:14,121 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-11-06 22:45:14,122 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:14,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:14,125 INFO L82 PathProgramCache]: Analyzing trace with hash 726160326, now seen corresponding path program 2 times [2020-11-06 22:45:14,126 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:14,126 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1222805857] [2020-11-06 22:45:14,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:14,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:14,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:14,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:14,280 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-06 22:45:14,281 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1222805857] [2020-11-06 22:45:14,281 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1370115732] [2020-11-06 22:45:14,281 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 [2020-11-06 22:45:14,367 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2020-11-06 22:45:14,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:45:14,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-06 22:45:14,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:45:14,414 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-06 22:45:14,421 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-06 22:45:14,467 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-11-06 22:45:14,467 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-11-06 22:45:14,467 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 11 [2020-11-06 22:45:14,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689961890] [2020-11-06 22:45:14,468 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-06 22:45:14,469 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:14,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-06 22:45:14,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2020-11-06 22:45:14,470 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 7 states. [2020-11-06 22:45:14,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:14,544 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-11-06 22:45:14,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-06 22:45:14,545 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 34 [2020-11-06 22:45:14,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:14,546 INFO L225 Difference]: With dead ends: 54 [2020-11-06 22:45:14,546 INFO L226 Difference]: Without dead ends: 38 [2020-11-06 22:45:14,547 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-11-06 22:45:14,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-11-06 22:45:14,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-11-06 22:45:14,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-11-06 22:45:14,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-11-06 22:45:14,555 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 34 [2020-11-06 22:45:14,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:14,555 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-11-06 22:45:14,555 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-06 22:45:14,555 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-11-06 22:45:14,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-11-06 22:45:14,557 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:14,557 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 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, 1, 1, 1] [2020-11-06 22:45:14,770 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:14,771 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:14,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:14,773 INFO L82 PathProgramCache]: Analyzing trace with hash 2117066849, now seen corresponding path program 1 times [2020-11-06 22:45:14,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:14,774 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560285027] [2020-11-06 22:45:14,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:14,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:14,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:14,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:14,855 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-11-06 22:45:14,856 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560285027] [2020-11-06 22:45:14,856 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [936700926] [2020-11-06 22:45:14,856 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 [2020-11-06 22:45:14,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:14,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-06 22:45:14,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:45:14,964 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-11-06 22:45:14,965 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:45:14,965 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2020-11-06 22:45:14,965 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521124056] [2020-11-06 22:45:14,966 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-06 22:45:14,966 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:14,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-06 22:45:14,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-11-06 22:45:14,967 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 7 states. [2020-11-06 22:45:15,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:15,108 INFO L93 Difference]: Finished difference Result 83 states and 100 transitions. [2020-11-06 22:45:15,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:45:15,109 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 36 [2020-11-06 22:45:15,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:15,110 INFO L225 Difference]: With dead ends: 83 [2020-11-06 22:45:15,110 INFO L226 Difference]: Without dead ends: 56 [2020-11-06 22:45:15,111 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-11-06 22:45:15,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-11-06 22:45:15,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 42. [2020-11-06 22:45:15,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-11-06 22:45:15,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-11-06 22:45:15,118 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2020-11-06 22:45:15,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:15,119 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-11-06 22:45:15,119 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-06 22:45:15,119 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-11-06 22:45:15,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-11-06 22:45:15,120 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:15,120 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:45:15,334 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:15,335 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:15,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:15,336 INFO L82 PathProgramCache]: Analyzing trace with hash 909557793, now seen corresponding path program 2 times [2020-11-06 22:45:15,337 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:15,337 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530284106] [2020-11-06 22:45:15,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:15,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:15,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:15,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:15,454 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-06 22:45:15,457 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530284106] [2020-11-06 22:45:15,457 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146565186] [2020-11-06 22:45:15,457 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:15,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2020-11-06 22:45:15,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:45:15,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 5 conjunts are in the unsatisfiable core [2020-11-06 22:45:15,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:45:15,563 INFO L375 QuantifierPusher]: Applying distributivity to a CONJUNCTION[2, 2, 3, 2, 1] term [2020-11-06 22:45:15,563 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-06 22:45:15,601 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-11-06 22:45:15,602 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-11-06 22:45:15,602 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7] total 10 [2020-11-06 22:45:15,602 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796954588] [2020-11-06 22:45:15,603 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-06 22:45:15,603 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:15,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-06 22:45:15,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-11-06 22:45:15,604 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 5 states. [2020-11-06 22:45:15,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:15,639 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-11-06 22:45:15,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-06 22:45:15,639 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 40 [2020-11-06 22:45:15,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:15,640 INFO L225 Difference]: With dead ends: 42 [2020-11-06 22:45:15,641 INFO L226 Difference]: Without dead ends: 0 [2020-11-06 22:45:15,641 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-11-06 22:45:15,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-06 22:45:15,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-06 22:45:15,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-06 22:45:15,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-06 22:45:15,642 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 40 [2020-11-06 22:45:15,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:15,643 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-06 22:45:15,643 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-06 22:45:15,643 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-06 22:45:15,643 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-06 22:45:15,854 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:15,858 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-11-06 22:45:16,008 INFO L266 CegarLoopResult]: For program point reach_errorEXIT(line 12) no Hoare annotation was computed. [2020-11-06 22:45:16,009 INFO L269 CegarLoopResult]: At program point reach_errorENTRY(line 12) the Hoare annotation is: true [2020-11-06 22:45:16,009 INFO L266 CegarLoopResult]: For program point L12-1(line 12) no Hoare annotation was computed. [2020-11-06 22:45:16,009 INFO L266 CegarLoopResult]: For program point L12-2(line 12) no Hoare annotation was computed. [2020-11-06 22:45:16,009 INFO L266 CegarLoopResult]: For program point reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION(line 12) no Hoare annotation was computed. [2020-11-06 22:45:16,009 INFO L266 CegarLoopResult]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2020-11-06 22:45:16,010 INFO L262 CegarLoopResult]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string0.offset| |old(#t~string0.offset)|) (= |old(#length)| |#length|) (= |#t~string1.base| |old(#t~string1.base)|) (= |#NULL.base| |old(#NULL.base)|) (= |#t~string0.base| |old(#t~string0.base)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|) (= |#t~string1.offset| |old(#t~string1.offset)|)) [2020-11-06 22:45:16,010 INFO L266 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-11-06 22:45:16,010 INFO L266 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-11-06 22:45:16,010 INFO L269 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-11-06 22:45:16,010 INFO L269 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-11-06 22:45:16,010 INFO L266 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-11-06 22:45:16,010 INFO L266 CegarLoopResult]: For program point L16(line 16) no Hoare annotation was computed. [2020-11-06 22:45:16,010 INFO L266 CegarLoopResult]: For program point L16-2(lines 15 17) no Hoare annotation was computed. [2020-11-06 22:45:16,010 INFO L266 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 15 17) no Hoare annotation was computed. [2020-11-06 22:45:16,011 INFO L266 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 15 17) no Hoare annotation was computed. [2020-11-06 22:45:16,011 INFO L266 CegarLoopResult]: For program point mainEXIT(lines 28 72) no Hoare annotation was computed. [2020-11-06 22:45:16,011 INFO L262 CegarLoopResult]: At program point L69(line 69) the Hoare annotation is: (or (= 1 main_~found~0) (= 0 main_~found~0)) [2020-11-06 22:45:16,011 INFO L266 CegarLoopResult]: For program point L69-1(line 69) no Hoare annotation was computed. [2020-11-06 22:45:16,013 INFO L266 CegarLoopResult]: For program point L53-2(lines 53 65) no Hoare annotation was computed. [2020-11-06 22:45:16,013 INFO L266 CegarLoopResult]: For program point L37-2(lines 37 38) no Hoare annotation was computed. [2020-11-06 22:45:16,013 INFO L262 CegarLoopResult]: At program point L37-3(lines 37 38) the Hoare annotation is: (or (= 1 main_~found~0) (= 0 main_~found~0)) [2020-11-06 22:45:16,013 INFO L266 CegarLoopResult]: For program point L37-4(lines 37 38) no Hoare annotation was computed. [2020-11-06 22:45:16,014 INFO L266 CegarLoopResult]: For program point L33-2(lines 33 34) no Hoare annotation was computed. [2020-11-06 22:45:16,015 INFO L262 CegarLoopResult]: At program point L33-3(lines 33 34) the Hoare annotation is: (or (= 1 main_~found~0) (= 0 main_~found~0)) [2020-11-06 22:45:16,015 INFO L266 CegarLoopResult]: For program point L33-4(lines 33 34) no Hoare annotation was computed. [2020-11-06 22:45:16,015 INFO L266 CegarLoopResult]: For program point L46-1(lines 46 47) no Hoare annotation was computed. [2020-11-06 22:45:16,015 INFO L266 CegarLoopResult]: For program point mainFINAL(lines 28 72) no Hoare annotation was computed. [2020-11-06 22:45:16,015 INFO L262 CegarLoopResult]: At program point L46-3(lines 46 47) the Hoare annotation is: (or (= 1 main_~found~0) (= 0 main_~found~0)) [2020-11-06 22:45:16,016 INFO L266 CegarLoopResult]: For program point L46-4(lines 29 72) no Hoare annotation was computed. [2020-11-06 22:45:16,016 INFO L266 CegarLoopResult]: For program point L42-1(lines 42 43) no Hoare annotation was computed. [2020-11-06 22:45:16,017 INFO L262 CegarLoopResult]: At program point L42-3(lines 42 43) the Hoare annotation is: (or (= 1 main_~found~0) (= 0 main_~found~0)) [2020-11-06 22:45:16,017 INFO L266 CegarLoopResult]: For program point L42-4(lines 42 43) no Hoare annotation was computed. [2020-11-06 22:45:16,017 INFO L262 CegarLoopResult]: At program point mainENTRY(lines 28 72) the Hoare annotation is: (and (= |old(#length)| |#length|) (= |old(#valid)| |#valid|)) [2020-11-06 22:45:16,018 INFO L266 CegarLoopResult]: For program point L55(lines 55 64) no Hoare annotation was computed. [2020-11-06 22:45:16,018 INFO L262 CegarLoopResult]: At program point L55-2(lines 53 65) the Hoare annotation is: (or (= 1 main_~found~0) (= 0 main_~found~0) (and (<= 0 main_~j~0) (<= main_~nc_B~0 0))) [2020-11-06 22:45:16,018 INFO L266 CegarLoopResult]: For program point L39(line 39) no Hoare annotation was computed. [2020-11-06 22:45:16,018 INFO L266 CegarLoopResult]: For program point L35(line 35) no Hoare annotation was computed. [2020-11-06 22:45:16,018 INFO L266 CegarLoopResult]: For program point L19-2(lines 18 23) no Hoare annotation was computed. [2020-11-06 22:45:16,018 INFO L269 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 18 23) the Hoare annotation is: true [2020-11-06 22:45:16,018 INFO L266 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 18 23) no Hoare annotation was computed. [2020-11-06 22:45:16,019 INFO L262 CegarLoopResult]: At program point L20(line 20) the Hoare annotation is: (not (<= 1 |__VERIFIER_assert_#in~cond|)) [2020-11-06 22:45:16,019 INFO L266 CegarLoopResult]: For program point L19(lines 19 21) no Hoare annotation was computed. [2020-11-06 22:45:16,019 INFO L266 CegarLoopResult]: For program point L20-1(line 20) no Hoare annotation was computed. [2020-11-06 22:45:16,052 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.11 10:45:16 BoogieIcfgContainer [2020-11-06 22:45:16,052 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-06 22:45:16,057 INFO L168 Benchmark]: Toolchain (without parser) took 4312.45 ms. Allocated memory was 163.6 MB in the beginning and 197.1 MB in the end (delta: 33.6 MB). Free memory was 137.9 MB in the beginning and 166.9 MB in the end (delta: -29.0 MB). Peak memory consumption was 105.4 MB. Max. memory is 8.0 GB. [2020-11-06 22:45:16,060 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 163.6 MB. Free memory is still 135.0 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-11-06 22:45:16,061 INFO L168 Benchmark]: CACSL2BoogieTranslator took 349.48 ms. Allocated memory is still 163.6 MB. Free memory was 137.3 MB in the beginning and 127.4 MB in the end (delta: 9.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2020-11-06 22:45:16,061 INFO L168 Benchmark]: Boogie Preprocessor took 43.26 ms. Allocated memory is still 163.6 MB. Free memory was 127.4 MB in the beginning and 125.6 MB in the end (delta: 1.8 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-11-06 22:45:16,063 INFO L168 Benchmark]: RCFGBuilder took 554.12 ms. Allocated memory is still 163.6 MB. Free memory was 125.6 MB in the beginning and 143.8 MB in the end (delta: -18.3 MB). Peak memory consumption was 19.8 MB. Max. memory is 8.0 GB. [2020-11-06 22:45:16,065 INFO L168 Benchmark]: TraceAbstraction took 3341.06 ms. Allocated memory was 163.6 MB in the beginning and 197.1 MB in the end (delta: 33.6 MB). Free memory was 143.5 MB in the beginning and 166.9 MB in the end (delta: -23.4 MB). Peak memory consumption was 111.9 MB. Max. memory is 8.0 GB. [2020-11-06 22:45:16,074 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 163.6 MB. Free memory is still 135.0 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 349.48 ms. Allocated memory is still 163.6 MB. Free memory was 137.3 MB in the beginning and 127.4 MB in the end (delta: 9.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 43.26 ms. Allocated memory is still 163.6 MB. Free memory was 127.4 MB in the beginning and 125.6 MB in the end (delta: 1.8 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 554.12 ms. Allocated memory is still 163.6 MB. Free memory was 125.6 MB in the beginning and 143.8 MB in the end (delta: -18.3 MB). Peak memory consumption was 19.8 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3341.06 ms. Allocated memory was 163.6 MB in the beginning and 197.1 MB in the end (delta: 33.6 MB). Free memory was 143.5 MB in the beginning and 166.9 MB in the end (delta: -23.4 MB). Peak memory consumption was 111.9 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 12]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 46]: Loop Invariant Derived loop invariant: 1 == found || 0 == found - InvariantResult [Line: 42]: Loop Invariant Derived loop invariant: 1 == found || 0 == found - InvariantResult [Line: 37]: Loop Invariant Derived loop invariant: 1 == found || 0 == found - InvariantResult [Line: 33]: Loop Invariant Derived loop invariant: 1 == found || 0 == found - InvariantResult [Line: 53]: Loop Invariant Derived loop invariant: (1 == found || 0 == found) || (0 <= j && nc_B <= 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 44 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 3.0s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 147 SDtfs, 82 SDslu, 282 SDs, 0 SdLazy, 246 SolverSat, 37 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 172 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=42occurred in iteration=4, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 30 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 13 LocationsWithAnnotation, 27 PreInvPairs, 41 NumberOfFragments, 89 HoareAnnotationTreeSize, 27 FomulaSimplifications, 87 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 13 FomulaSimplificationsInter, 50 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 304 NumberOfCodeBlocks, 282 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 295 ConstructedInterpolants, 0 QuantifiedInterpolants, 16849 SizeOfPredicates, 10 NumberOfNonLiveVariables, 545 ConjunctsInSsa, 19 ConjunctsInUnsatCore, 9 InterpolantComputations, 3 PerfectInterpolantSequences, 57/80 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 RESULT: Ultimate proved your program to be correct! Received shutdown request...