/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/recursive-simple/id2_b2_o3.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-06 22:18:52,141 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-06 22:18:52,144 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-06 22:18:52,181 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-06 22:18:52,181 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-06 22:18:52,183 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-06 22:18:52,185 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-06 22:18:52,187 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-06 22:18:52,189 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-06 22:18:52,190 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-06 22:18:52,192 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-06 22:18:52,193 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-06 22:18:52,194 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-06 22:18:52,195 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-06 22:18:52,196 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-06 22:18:52,198 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-06 22:18:52,199 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-06 22:18:52,200 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-06 22:18:52,202 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-06 22:18:52,205 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-06 22:18:52,206 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-06 22:18:52,208 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-06 22:18:52,209 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-06 22:18:52,211 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-06 22:18:52,214 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-06 22:18:52,249 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-06 22:18:52,250 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-06 22:18:52,251 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-06 22:18:52,259 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-06 22:18:52,261 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-06 22:18:52,261 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-06 22:18:52,265 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-06 22:18:52,266 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-06 22:18:52,266 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-06 22:18:52,267 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-06 22:18:52,271 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-06 22:18:52,272 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 22:18:52,304 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-06 22:18:52,304 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-06 22:18:52,309 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-06 22:18:52,309 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-06 22:18:52,309 INFO L138 SettingsManager]: * Use SBE=true [2020-11-06 22:18:52,310 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-06 22:18:52,310 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-06 22:18:52,311 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-06 22:18:52,311 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-06 22:18:52,311 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-06 22:18:52,312 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-06 22:18:52,312 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-06 22:18:52,312 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-06 22:18:52,312 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-06 22:18:52,312 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-06 22:18:52,312 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-06 22:18:52,313 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-06 22:18:52,313 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-06 22:18:52,314 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-06 22:18:52,314 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-06 22:18:52,314 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-06 22:18:52,314 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-06 22:18:52,315 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-06 22:18:52,315 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-06 22:18:52,315 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-06 22:18:52,315 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-06 22:18:52,315 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-06 22:18:52,315 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-06 22:18:52,316 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-06 22:18:52,316 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-11-06 22:18:52,731 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-06 22:18:52,771 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-06 22:18:52,774 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-06 22:18:52,776 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-06 22:18:52,780 INFO L275 PluginConnector]: CDTParser initialized [2020-11-06 22:18:52,780 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_b2_o3.c [2020-11-06 22:18:52,854 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d95423676/d5369cd87162499f877505583455f9fc/FLAG2e375d1ae [2020-11-06 22:18:53,419 INFO L306 CDTParser]: Found 1 translation units. [2020-11-06 22:18:53,420 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_b2_o3.c [2020-11-06 22:18:53,427 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d95423676/d5369cd87162499f877505583455f9fc/FLAG2e375d1ae [2020-11-06 22:18:53,769 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d95423676/d5369cd87162499f877505583455f9fc [2020-11-06 22:18:53,772 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-06 22:18:53,779 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-06 22:18:53,781 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-06 22:18:53,781 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-06 22:18:53,785 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-06 22:18:53,786 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:18:53" (1/1) ... [2020-11-06 22:18:53,789 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6fceafc7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:18:53, skipping insertion in model container [2020-11-06 22:18:53,790 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:18:53" (1/1) ... [2020-11-06 22:18:53,798 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-06 22:18:53,812 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-06 22:18:53,984 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:18:53,994 INFO L203 MainTranslator]: Completed pre-run [2020-11-06 22:18:54,013 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:18:54,029 INFO L208 MainTranslator]: Completed translation [2020-11-06 22:18:54,029 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:18:54 WrapperNode [2020-11-06 22:18:54,030 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-06 22:18:54,031 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-06 22:18:54,031 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-06 22:18:54,031 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-06 22:18:54,044 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:18:54" (1/1) ... [2020-11-06 22:18:54,044 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:18:54" (1/1) ... [2020-11-06 22:18:54,052 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:18:54" (1/1) ... [2020-11-06 22:18:54,052 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:18:54" (1/1) ... [2020-11-06 22:18:54,058 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:18:54" (1/1) ... [2020-11-06 22:18:54,060 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:18:54" (1/1) ... [2020-11-06 22:18:54,061 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:18:54" (1/1) ... [2020-11-06 22:18:54,063 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-06 22:18:54,064 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-06 22:18:54,064 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-06 22:18:54,064 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-06 22:18:54,065 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:18:54" (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 22:18:54,177 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-06 22:18:54,177 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-06 22:18:54,177 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-06 22:18:54,178 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-11-06 22:18:54,178 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-11-06 22:18:54,178 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-06 22:18:54,178 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-11-06 22:18:54,179 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-06 22:18:54,179 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-06 22:18:54,179 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-06 22:18:54,180 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-06 22:18:54,180 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-11-06 22:18:54,180 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-11-06 22:18:54,181 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-06 22:18:54,181 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-06 22:18:54,182 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-06 22:18:54,182 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-06 22:18:54,183 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-06 22:18:54,183 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-06 22:18:54,183 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-06 22:18:54,470 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-06 22:18:54,470 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-11-06 22:18:54,472 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:18:54 BoogieIcfgContainer [2020-11-06 22:18:54,472 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-06 22:18:54,474 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-06 22:18:54,474 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-06 22:18:54,478 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-06 22:18:54,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:18:53" (1/3) ... [2020-11-06 22:18:54,479 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1403e3ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:18:54, skipping insertion in model container [2020-11-06 22:18:54,480 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:18:54" (2/3) ... [2020-11-06 22:18:54,480 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1403e3ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:18:54, skipping insertion in model container [2020-11-06 22:18:54,480 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:18:54" (3/3) ... [2020-11-06 22:18:54,482 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_b2_o3.c [2020-11-06 22:18:54,500 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-06 22:18:54,504 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-06 22:18:54,517 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-06 22:18:54,579 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-06 22:18:54,580 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-06 22:18:54,580 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-06 22:18:54,580 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-06 22:18:54,580 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-06 22:18:54,580 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-06 22:18:54,581 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-06 22:18:54,581 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-06 22:18:54,621 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-11-06 22:18:54,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-11-06 22:18:54,636 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:18:54,637 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:18:54,638 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:18:54,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:18:54,646 INFO L82 PathProgramCache]: Analyzing trace with hash 791772439, now seen corresponding path program 1 times [2020-11-06 22:18:54,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:18:54,659 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721153616] [2020-11-06 22:18:54,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:18:54,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:54,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:18:54,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:54,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:18:54,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:54,995 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 22:18:54,996 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721153616] [2020-11-06 22:18:54,996 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:18:54,997 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-06 22:18:54,998 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469866625] [2020-11-06 22:18:55,003 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-06 22:18:55,003 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:18:55,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-06 22:18:55,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:18:55,021 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 6 states. [2020-11-06 22:18:55,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:18:55,416 INFO L93 Difference]: Finished difference Result 46 states and 53 transitions. [2020-11-06 22:18:55,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:18:55,419 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-11-06 22:18:55,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:18:55,436 INFO L225 Difference]: With dead ends: 46 [2020-11-06 22:18:55,436 INFO L226 Difference]: Without dead ends: 28 [2020-11-06 22:18:55,443 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:18:55,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-11-06 22:18:55,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-11-06 22:18:55,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-11-06 22:18:55,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-11-06 22:18:55,493 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 15 [2020-11-06 22:18:55,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:18:55,494 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-11-06 22:18:55,494 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-06 22:18:55,494 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-11-06 22:18:55,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-11-06 22:18:55,496 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:18:55,496 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] [2020-11-06 22:18:55,496 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-06 22:18:55,497 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:18:55,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:18:55,498 INFO L82 PathProgramCache]: Analyzing trace with hash 2001775916, now seen corresponding path program 1 times [2020-11-06 22:18:55,498 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:18:55,498 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354499865] [2020-11-06 22:18:55,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:18:55,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:55,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:18:55,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:55,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:18:55,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:55,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:18:55,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:55,690 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 22:18:55,691 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354499865] [2020-11-06 22:18:55,691 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:18:55,692 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-06 22:18:55,692 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687008114] [2020-11-06 22:18:55,693 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-06 22:18:55,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:18:55,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-06 22:18:55,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:18:55,695 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-11-06 22:18:55,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:18:55,927 INFO L93 Difference]: Finished difference Result 47 states and 55 transitions. [2020-11-06 22:18:55,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:18:55,928 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-11-06 22:18:55,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:18:55,930 INFO L225 Difference]: With dead ends: 47 [2020-11-06 22:18:55,930 INFO L226 Difference]: Without dead ends: 34 [2020-11-06 22:18:55,931 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:18:55,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-11-06 22:18:55,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-11-06 22:18:55,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-11-06 22:18:55,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2020-11-06 22:18:55,943 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 22 [2020-11-06 22:18:55,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:18:55,943 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2020-11-06 22:18:55,944 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-06 22:18:55,944 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2020-11-06 22:18:55,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-11-06 22:18:55,945 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:18:55,945 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] [2020-11-06 22:18:55,946 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-06 22:18:55,946 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:18:55,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:18:55,947 INFO L82 PathProgramCache]: Analyzing trace with hash -1405687699, now seen corresponding path program 1 times [2020-11-06 22:18:55,947 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:18:55,947 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [814133635] [2020-11-06 22:18:55,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:18:55,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:56,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:18:56,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:56,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:18:56,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:56,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:18:56,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:56,160 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 22:18:56,161 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [814133635] [2020-11-06 22:18:56,161 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:18:56,161 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-11-06 22:18:56,161 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181989983] [2020-11-06 22:18:56,162 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-06 22:18:56,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:18:56,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-06 22:18:56,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:18:56,164 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 9 states. [2020-11-06 22:18:56,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:18:56,575 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2020-11-06 22:18:56,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-06 22:18:56,576 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-11-06 22:18:56,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:18:56,577 INFO L225 Difference]: With dead ends: 39 [2020-11-06 22:18:56,577 INFO L226 Difference]: Without dead ends: 34 [2020-11-06 22:18:56,578 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2020-11-06 22:18:56,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-11-06 22:18:56,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-11-06 22:18:56,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-11-06 22:18:56,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2020-11-06 22:18:56,587 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 22 [2020-11-06 22:18:56,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:18:56,587 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2020-11-06 22:18:56,587 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-06 22:18:56,588 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2020-11-06 22:18:56,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-11-06 22:18:56,589 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:18:56,589 INFO L422 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, 1, 1, 1, 1] [2020-11-06 22:18:56,589 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-06 22:18:56,589 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:18:56,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:18:56,590 INFO L82 PathProgramCache]: Analyzing trace with hash 20115896, now seen corresponding path program 1 times [2020-11-06 22:18:56,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:18:56,591 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768639151] [2020-11-06 22:18:56,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:18:56,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:56,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:18:56,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:56,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:18:56,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:56,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:18:56,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:56,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:18:56,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:56,791 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-06 22:18:56,792 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768639151] [2020-11-06 22:18:56,792 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:18:56,792 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-06 22:18:56,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271463275] [2020-11-06 22:18:56,793 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-06 22:18:56,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:18:56,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-06 22:18:56,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:18:56,795 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 6 states. [2020-11-06 22:18:57,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:18:57,058 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2020-11-06 22:18:57,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:18:57,059 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 29 [2020-11-06 22:18:57,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:18:57,060 INFO L225 Difference]: With dead ends: 51 [2020-11-06 22:18:57,060 INFO L226 Difference]: Without dead ends: 38 [2020-11-06 22:18:57,061 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:18:57,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-11-06 22:18:57,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2020-11-06 22:18:57,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-11-06 22:18:57,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2020-11-06 22:18:57,081 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 29 [2020-11-06 22:18:57,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:18:57,081 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2020-11-06 22:18:57,081 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-06 22:18:57,082 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2020-11-06 22:18:57,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-11-06 22:18:57,087 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:18:57,087 INFO L422 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, 1, 1, 1, 1] [2020-11-06 22:18:57,087 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-06 22:18:57,087 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:18:57,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:18:57,088 INFO L82 PathProgramCache]: Analyzing trace with hash -1776835463, now seen corresponding path program 1 times [2020-11-06 22:18:57,088 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:18:57,089 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [38357167] [2020-11-06 22:18:57,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:18:57,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:57,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:18:57,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:57,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:18:57,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:57,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:18:57,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:57,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:18:57,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:57,273 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-06 22:18:57,273 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [38357167] [2020-11-06 22:18:57,274 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:18:57,274 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-11-06 22:18:57,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311718646] [2020-11-06 22:18:57,274 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-06 22:18:57,275 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:18:57,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-06 22:18:57,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:18:57,276 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 9 states. [2020-11-06 22:18:57,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:18:57,745 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2020-11-06 22:18:57,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-06 22:18:57,746 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2020-11-06 22:18:57,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:18:57,747 INFO L225 Difference]: With dead ends: 55 [2020-11-06 22:18:57,747 INFO L226 Difference]: Without dead ends: 42 [2020-11-06 22:18:57,748 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2020-11-06 22:18:57,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-11-06 22:18:57,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2020-11-06 22:18:57,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-11-06 22:18:57,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2020-11-06 22:18:57,758 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 29 [2020-11-06 22:18:57,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:18:57,759 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2020-11-06 22:18:57,759 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-06 22:18:57,759 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2020-11-06 22:18:57,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-11-06 22:18:57,760 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:18:57,760 INFO L422 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, 1, 1, 1, 1] [2020-11-06 22:18:57,760 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-11-06 22:18:57,761 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:18:57,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:18:57,761 INFO L82 PathProgramCache]: Analyzing trace with hash -889331782, now seen corresponding path program 1 times [2020-11-06 22:18:57,761 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:18:57,762 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751901405] [2020-11-06 22:18:57,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:18:57,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:57,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:18:57,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:57,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:18:57,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:57,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:18:57,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:57,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:18:57,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:58,029 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-06 22:18:58,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751901405] [2020-11-06 22:18:58,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984395511] [2020-11-06 22:18:58,030 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 22:18:58,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:58,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 19 conjunts are in the unsatisfiable core [2020-11-06 22:18:58,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:18:58,204 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-06 22:18:58,204 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:18:58,204 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2020-11-06 22:18:58,205 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118164540] [2020-11-06 22:18:58,205 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-06 22:18:58,206 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:18:58,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-06 22:18:58,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-11-06 22:18:58,207 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 13 states. [2020-11-06 22:18:58,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:18:58,923 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2020-11-06 22:18:58,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-11-06 22:18:58,924 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 29 [2020-11-06 22:18:58,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:18:58,926 INFO L225 Difference]: With dead ends: 49 [2020-11-06 22:18:58,926 INFO L226 Difference]: Without dead ends: 44 [2020-11-06 22:18:58,927 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2020-11-06 22:18:58,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-11-06 22:18:58,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 36. [2020-11-06 22:18:58,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-11-06 22:18:58,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2020-11-06 22:18:58,941 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 29 [2020-11-06 22:18:58,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:18:58,943 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2020-11-06 22:18:58,944 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-06 22:18:58,944 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2020-11-06 22:18:58,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-11-06 22:18:58,945 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:18:58,945 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 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] [2020-11-06 22:18:59,146 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-11-06 22:18:59,147 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:18:59,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:18:59,148 INFO L82 PathProgramCache]: Analyzing trace with hash 881285147, now seen corresponding path program 1 times [2020-11-06 22:18:59,148 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:18:59,149 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [194778401] [2020-11-06 22:18:59,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:18:59,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:59,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:18:59,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:59,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:18:59,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:59,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:18:59,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:59,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:18:59,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:59,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:18:59,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:59,383 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-06 22:18:59,383 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [194778401] [2020-11-06 22:18:59,384 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:18:59,384 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-11-06 22:18:59,384 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259084642] [2020-11-06 22:18:59,384 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-06 22:18:59,385 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:18:59,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-06 22:18:59,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:18:59,386 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 9 states. [2020-11-06 22:18:59,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:18:59,816 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2020-11-06 22:18:59,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-06 22:18:59,817 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-11-06 22:18:59,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:18:59,818 INFO L225 Difference]: With dead ends: 61 [2020-11-06 22:18:59,818 INFO L226 Difference]: Without dead ends: 46 [2020-11-06 22:18:59,819 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2020-11-06 22:18:59,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-11-06 22:18:59,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2020-11-06 22:18:59,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-11-06 22:18:59,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-11-06 22:18:59,827 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 36 [2020-11-06 22:18:59,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:18:59,827 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-11-06 22:18:59,827 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-06 22:18:59,827 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-11-06 22:18:59,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-11-06 22:18:59,829 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:18:59,829 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 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] [2020-11-06 22:18:59,829 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-11-06 22:18:59,829 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:18:59,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:18:59,830 INFO L82 PathProgramCache]: Analyzing trace with hash -915666212, now seen corresponding path program 1 times [2020-11-06 22:18:59,830 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:18:59,830 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [498163561] [2020-11-06 22:18:59,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:18:59,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:59,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:18:59,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:59,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:18:59,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:18:59,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:18:59,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:00,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:19:00,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:00,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:19:00,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:00,113 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-06 22:19:00,113 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [498163561] [2020-11-06 22:19:00,114 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881598584] [2020-11-06 22:19:00,114 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 [2020-11-06 22:19:00,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:00,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 19 conjunts are in the unsatisfiable core [2020-11-06 22:19:00,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:19:00,246 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-06 22:19:00,247 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:19:00,247 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2020-11-06 22:19:00,247 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209271923] [2020-11-06 22:19:00,248 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-06 22:19:00,248 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:19:00,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-06 22:19:00,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-11-06 22:19:00,249 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 13 states. [2020-11-06 22:19:00,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:19:00,974 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2020-11-06 22:19:00,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-11-06 22:19:00,975 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-11-06 22:19:00,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:19:00,976 INFO L225 Difference]: With dead ends: 67 [2020-11-06 22:19:00,976 INFO L226 Difference]: Without dead ends: 52 [2020-11-06 22:19:00,977 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2020-11-06 22:19:00,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-11-06 22:19:00,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 48. [2020-11-06 22:19:00,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-11-06 22:19:00,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2020-11-06 22:19:00,985 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 36 [2020-11-06 22:19:00,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:19:00,986 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2020-11-06 22:19:00,986 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-06 22:19:00,986 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2020-11-06 22:19:00,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-11-06 22:19:00,988 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:19:00,988 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:19:01,201 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:19:01,202 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:19:01,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:19:01,204 INFO L82 PathProgramCache]: Analyzing trace with hash -1827860003, now seen corresponding path program 2 times [2020-11-06 22:19:01,204 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:19:01,204 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072158484] [2020-11-06 22:19:01,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:19:01,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:01,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:19:01,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:01,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:19:01,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:01,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:19:01,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:01,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:19:01,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:01,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:19:01,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:01,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-06 22:19:01,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:19:01,478 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-06 22:19:01,478 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072158484] [2020-11-06 22:19:01,479 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [318558999] [2020-11-06 22:19:01,479 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 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 22:19:01,539 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-06 22:19:01,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:19:01,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 32 conjunts are in the unsatisfiable core [2020-11-06 22:19:01,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:19:01,746 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-06 22:19:01,746 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:19:01,746 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-11-06 22:19:01,746 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107133218] [2020-11-06 22:19:01,747 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-11-06 22:19:01,747 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:19:01,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-11-06 22:19:01,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-11-06 22:19:01,748 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 19 states. [2020-11-06 22:19:02,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:19:02,582 INFO L93 Difference]: Finished difference Result 60 states and 65 transitions. [2020-11-06 22:19:02,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-11-06 22:19:02,583 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2020-11-06 22:19:02,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:19:02,584 INFO L225 Difference]: With dead ends: 60 [2020-11-06 22:19:02,584 INFO L226 Difference]: Without dead ends: 0 [2020-11-06 22:19:02,586 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-11-06 22:19:02,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-06 22:19:02,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-06 22:19:02,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-06 22:19:02,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-06 22:19:02,587 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 43 [2020-11-06 22:19:02,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:19:02,587 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-06 22:19:02,587 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-11-06 22:19:02,587 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-06 22:19:02,587 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-06 22:19:02,794 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:19:02,798 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-11-06 22:19:02,873 INFO L266 CegarLoopResult]: For program point reach_errorEXIT(line 4) no Hoare annotation was computed. [2020-11-06 22:19:02,873 INFO L269 CegarLoopResult]: At program point reach_errorENTRY(line 4) the Hoare annotation is: true [2020-11-06 22:19:02,873 INFO L266 CegarLoopResult]: For program point reach_errorFINAL(line 4) no Hoare annotation was computed. [2020-11-06 22:19:02,873 INFO L266 CegarLoopResult]: For program point reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION(line 4) no Hoare annotation was computed. [2020-11-06 22:19:02,874 INFO L266 CegarLoopResult]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2020-11-06 22:19:02,874 INFO L262 CegarLoopResult]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2020-11-06 22:19:02,874 INFO L266 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-11-06 22:19:02,874 INFO L266 CegarLoopResult]: For program point L17(line 17) no Hoare annotation was computed. [2020-11-06 22:19:02,874 INFO L266 CegarLoopResult]: For program point L18-1(line 18) no Hoare annotation was computed. [2020-11-06 22:19:02,874 INFO L266 CegarLoopResult]: For program point id2EXIT(lines 16 21) no Hoare annotation was computed. [2020-11-06 22:19:02,874 INFO L269 CegarLoopResult]: At program point id2ENTRY(lines 16 21) the Hoare annotation is: true [2020-11-06 22:19:02,874 INFO L266 CegarLoopResult]: For program point L19(line 19) no Hoare annotation was computed. [2020-11-06 22:19:02,875 INFO L266 CegarLoopResult]: For program point id2FINAL(lines 16 21) no Hoare annotation was computed. [2020-11-06 22:19:02,875 INFO L269 CegarLoopResult]: At program point L18(line 18) the Hoare annotation is: true [2020-11-06 22:19:02,875 INFO L266 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-11-06 22:19:02,875 INFO L269 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-11-06 22:19:02,875 INFO L269 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-11-06 22:19:02,875 INFO L266 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-11-06 22:19:02,875 INFO L269 CegarLoopResult]: At program point mainENTRY(lines 23 29) the Hoare annotation is: true [2020-11-06 22:19:02,875 INFO L262 CegarLoopResult]: At program point L27(line 27) the Hoare annotation is: false [2020-11-06 22:19:02,875 INFO L266 CegarLoopResult]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-11-06 22:19:02,875 INFO L266 CegarLoopResult]: For program point L27-1(line 27) no Hoare annotation was computed. [2020-11-06 22:19:02,876 INFO L269 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: true [2020-11-06 22:19:02,876 INFO L266 CegarLoopResult]: For program point mainEXIT(lines 23 29) no Hoare annotation was computed. [2020-11-06 22:19:02,876 INFO L266 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-11-06 22:19:02,876 INFO L266 CegarLoopResult]: For program point L26-2(lines 23 29) no Hoare annotation was computed. [2020-11-06 22:19:02,876 INFO L266 CegarLoopResult]: For program point idFINAL(lines 9 14) no Hoare annotation was computed. [2020-11-06 22:19:02,876 INFO L266 CegarLoopResult]: For program point L12(line 12) no Hoare annotation was computed. [2020-11-06 22:19:02,876 INFO L269 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: true [2020-11-06 22:19:02,876 INFO L266 CegarLoopResult]: For program point idEXIT(lines 9 14) no Hoare annotation was computed. [2020-11-06 22:19:02,876 INFO L266 CegarLoopResult]: For program point L10(line 10) no Hoare annotation was computed. [2020-11-06 22:19:02,877 INFO L266 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-11-06 22:19:02,877 INFO L269 CegarLoopResult]: At program point idENTRY(lines 9 14) the Hoare annotation is: true [2020-11-06 22:19:02,882 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.11 10:19:02 BoogieIcfgContainer [2020-11-06 22:19:02,882 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-06 22:19:02,884 INFO L168 Benchmark]: Toolchain (without parser) took 9109.34 ms. Allocated memory was 158.3 MB in the beginning and 235.9 MB in the end (delta: 77.6 MB). Free memory was 114.2 MB in the beginning and 150.0 MB in the end (delta: -35.8 MB). Peak memory consumption was 42.0 MB. Max. memory is 8.0 GB. [2020-11-06 22:19:02,885 INFO L168 Benchmark]: CDTParser took 0.13 ms. Allocated memory is still 158.3 MB. Free memory was 131.3 MB in the beginning and 131.2 MB in the end (delta: 105.0 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-11-06 22:19:02,886 INFO L168 Benchmark]: CACSL2BoogieTranslator took 249.13 ms. Allocated memory is still 158.3 MB. Free memory was 113.5 MB in the beginning and 104.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-11-06 22:19:02,887 INFO L168 Benchmark]: Boogie Preprocessor took 32.10 ms. Allocated memory is still 158.3 MB. Free memory was 104.3 MB in the beginning and 102.9 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 8.0 GB. [2020-11-06 22:19:02,888 INFO L168 Benchmark]: RCFGBuilder took 408.42 ms. Allocated memory is still 158.3 MB. Free memory was 102.9 MB in the beginning and 127.1 MB in the end (delta: -24.2 MB). Peak memory consumption was 7.3 MB. Max. memory is 8.0 GB. [2020-11-06 22:19:02,889 INFO L168 Benchmark]: TraceAbstraction took 8408.24 ms. Allocated memory was 158.3 MB in the beginning and 235.9 MB in the end (delta: 77.6 MB). Free memory was 126.7 MB in the beginning and 150.0 MB in the end (delta: -23.3 MB). Peak memory consumption was 54.8 MB. Max. memory is 8.0 GB. [2020-11-06 22:19:02,892 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 ms. Allocated memory is still 158.3 MB. Free memory was 131.3 MB in the beginning and 131.2 MB in the end (delta: 105.0 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 249.13 ms. Allocated memory is still 158.3 MB. Free memory was 113.5 MB in the beginning and 104.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 32.10 ms. Allocated memory is still 158.3 MB. Free memory was 104.3 MB in the beginning and 102.9 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 8.0 GB. * RCFGBuilder took 408.42 ms. Allocated memory is still 158.3 MB. Free memory was 102.9 MB in the beginning and 127.1 MB in the end (delta: -24.2 MB). Peak memory consumption was 7.3 MB. Max. memory is 8.0 GB. * TraceAbstraction took 8408.24 ms. Allocated memory was 158.3 MB in the beginning and 235.9 MB in the end (delta: 77.6 MB). Free memory was 126.7 MB in the beginning and 150.0 MB in the end (delta: -23.3 MB). Peak memory consumption was 54.8 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 4]: 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 - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 8.2s, OverallIterations: 9, TraceHistogramMax: 3, AutomataDifference: 4.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 228 SDtfs, 213 SDslu, 513 SDs, 0 SdLazy, 1765 SolverSat, 59 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 315 GetRequests, 183 SyntacticMatches, 3 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 3.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=48occurred in iteration=8, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 9 MinimizatonAttempts, 22 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 21 PreInvPairs, 21 NumberOfFragments, 41 HoareAnnotationTreeSize, 21 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 11 FomulaSimplificationsInter, 180 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 2.2s InterpolantComputationTime, 369 NumberOfCodeBlocks, 369 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 357 ConstructedInterpolants, 0 QuantifiedInterpolants, 42343 SizeOfPredicates, 11 NumberOfNonLiveVariables, 423 ConjunctsInSsa, 70 ConjunctsInUnsatCore, 12 InterpolantComputations, 6 PerfectInterpolantSequences, 65/93 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...