/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/nla-digbench-scaling/geo2-ll_unwindbound5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 07:46:22,613 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 07:46:22,615 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 07:46:22,651 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 07:46:22,652 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 07:46:22,653 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 07:46:22,655 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 07:46:22,658 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 07:46:22,660 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 07:46:22,661 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 07:46:22,662 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 07:46:22,664 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 07:46:22,664 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 07:46:22,666 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 07:46:22,667 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 07:46:22,668 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 07:46:22,670 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 07:46:22,671 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 07:46:22,673 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 07:46:22,693 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 07:46:22,695 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 07:46:22,696 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 07:46:22,698 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 07:46:22,699 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 07:46:22,702 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-23 07:46:22,706 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-23 07:46:22,707 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-23 07:46:22,708 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-23 07:46:22,709 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-23 07:46:22,710 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-23 07:46:22,711 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-23 07:46:22,711 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-23 07:46:22,712 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-23 07:46:22,712 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 07:46:22,713 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 07:46:22,714 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 07:46:22,714 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-23 07:46:22,742 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 07:46:22,742 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 07:46:22,743 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 07:46:22,744 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 07:46:22,744 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 07:46:22,744 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 07:46:22,744 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 07:46:22,744 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 07:46:22,745 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 07:46:22,745 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 07:46:22,745 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 07:46:22,745 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 07:46:22,745 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 07:46:22,746 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 07:46:22,746 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 07:46:22,746 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 07:46:22,746 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 07:46:22,746 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 07:46:22,747 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 07:46:22,747 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 07:46:22,747 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 07:46:22,747 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 07:46:22,747 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 07:46:22,748 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 07:46:22,748 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 07:46:22,748 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-bitabs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 07:46:23,115 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 07:46:23,145 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 07:46:23,149 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 07:46:23,150 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 07:46:23,151 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 07:46:23,152 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/nla-digbench-scaling/geo2-ll_unwindbound5.c [2020-12-23 07:46:23,224 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/7b233dbc2/b56af16ad7df4067ba1a7fc672e14e50/FLAG88ae71440 [2020-12-23 07:46:23,864 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 07:46:23,864 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/geo2-ll_unwindbound5.c [2020-12-23 07:46:23,872 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/7b233dbc2/b56af16ad7df4067ba1a7fc672e14e50/FLAG88ae71440 [2020-12-23 07:46:24,222 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/7b233dbc2/b56af16ad7df4067ba1a7fc672e14e50 [2020-12-23 07:46:24,228 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 07:46:24,231 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 07:46:24,235 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 07:46:24,235 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 07:46:24,239 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 07:46:24,240 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 07:46:24" (1/1) ... [2020-12-23 07:46:24,243 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ab4f3ff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:46:24, skipping insertion in model container [2020-12-23 07:46:24,243 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 07:46:24" (1/1) ... [2020-12-23 07:46:24,252 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 07:46:24,273 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 07:46:24,422 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/geo2-ll_unwindbound5.c[525,538] left hand side expression in assignment: lhs: VariableLHS[~z~0,] left hand side expression in assignment: lhs: VariableLHS[~k~0,] left hand side expression in assignment: lhs: VariableLHS[~x~0,] left hand side expression in assignment: lhs: VariableLHS[~y~0,] left hand side expression in assignment: lhs: VariableLHS[~c~0,] left hand side expression in assignment: lhs: VariableLHS[~c~0,] left hand side expression in assignment: lhs: VariableLHS[~x~0,] left hand side expression in assignment: lhs: VariableLHS[~y~0,] [2020-12-23 07:46:24,440 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 07:46:24,450 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 07:46:24,464 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/geo2-ll_unwindbound5.c[525,538] left hand side expression in assignment: lhs: VariableLHS[~z~0,] left hand side expression in assignment: lhs: VariableLHS[~k~0,] left hand side expression in assignment: lhs: VariableLHS[~x~0,] left hand side expression in assignment: lhs: VariableLHS[~y~0,] left hand side expression in assignment: lhs: VariableLHS[~c~0,] left hand side expression in assignment: lhs: VariableLHS[~c~0,] left hand side expression in assignment: lhs: VariableLHS[~x~0,] left hand side expression in assignment: lhs: VariableLHS[~y~0,] [2020-12-23 07:46:24,470 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 07:46:24,486 INFO L208 MainTranslator]: Completed translation [2020-12-23 07:46:24,487 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:46:24 WrapperNode [2020-12-23 07:46:24,487 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 07:46:24,489 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 07:46:24,489 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 07:46:24,489 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 07:46:24,497 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:46:24" (1/1) ... [2020-12-23 07:46:24,505 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:46:24" (1/1) ... [2020-12-23 07:46:24,526 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 07:46:24,527 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 07:46:24,527 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 07:46:24,527 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 07:46:24,536 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:46:24" (1/1) ... [2020-12-23 07:46:24,536 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:46:24" (1/1) ... [2020-12-23 07:46:24,538 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:46:24" (1/1) ... [2020-12-23 07:46:24,538 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:46:24" (1/1) ... [2020-12-23 07:46:24,542 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:46:24" (1/1) ... [2020-12-23 07:46:24,547 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:46:24" (1/1) ... [2020-12-23 07:46:24,548 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:46:24" (1/1) ... [2020-12-23 07:46:24,550 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 07:46:24,551 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 07:46:24,551 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 07:46:24,551 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 07:46:24,552 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:46:24" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:46:24,642 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 07:46:24,643 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 07:46:24,643 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 07:46:24,643 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 07:46:24,874 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 07:46:24,874 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-23 07:46:24,876 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 07:46:24 BoogieIcfgContainer [2020-12-23 07:46:24,877 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 07:46:24,883 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 07:46:24,883 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 07:46:24,887 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 07:46:24,888 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 07:46:24" (1/3) ... [2020-12-23 07:46:24,889 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4484b524 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 07:46:24, skipping insertion in model container [2020-12-23 07:46:24,889 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:46:24" (2/3) ... [2020-12-23 07:46:24,890 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4484b524 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 07:46:24, skipping insertion in model container [2020-12-23 07:46:24,890 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 07:46:24" (3/3) ... [2020-12-23 07:46:24,892 INFO L111 eAbstractionObserver]: Analyzing ICFG geo2-ll_unwindbound5.c [2020-12-23 07:46:24,899 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 07:46:24,908 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-12-23 07:46:24,931 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-12-23 07:46:24,963 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 07:46:24,963 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 07:46:24,964 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 07:46:24,964 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 07:46:24,964 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 07:46:24,964 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 07:46:24,965 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 07:46:24,965 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 07:46:25,029 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2020-12-23 07:46:25,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-23 07:46:25,045 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:46:25,046 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-23 07:46:25,046 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:46:25,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:46:25,060 INFO L82 PathProgramCache]: Analyzing trace with hash 889571274, now seen corresponding path program 1 times [2020-12-23 07:46:25,086 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:46:25,086 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735499495] [2020-12-23 07:46:25,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:46:25,237 ERROR L270 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2020-12-23 07:46:25,239 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [688235131] [2020-12-23 07:46:25,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:46:25,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:46:25,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 07:46:25,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:46:25,415 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:46:25,415 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735499495] [2020-12-23 07:46:25,416 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-23 07:46:25,416 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [688235131] [2020-12-23 07:46:25,417 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 07:46:25,417 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-23 07:46:25,418 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784517148] [2020-12-23 07:46:25,424 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-23 07:46:25,424 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:46:25,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-23 07:46:25,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-23 07:46:25,443 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 4 states. [2020-12-23 07:46:25,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:46:25,532 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2020-12-23 07:46:25,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 07:46:25,534 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2020-12-23 07:46:25,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:46:25,543 INFO L225 Difference]: With dead ends: 44 [2020-12-23 07:46:25,544 INFO L226 Difference]: Without dead ends: 19 [2020-12-23 07:46:25,547 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-23 07:46:25,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-23 07:46:25,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 16. [2020-12-23 07:46:25,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-23 07:46:25,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2020-12-23 07:46:25,585 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 6 [2020-12-23 07:46:25,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:46:25,585 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2020-12-23 07:46:25,585 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-23 07:46:25,586 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2020-12-23 07:46:25,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-23 07:46:25,586 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:46:25,586 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 07:46:25,801 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2020-12-23 07:46:25,802 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:46:25,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:46:25,805 INFO L82 PathProgramCache]: Analyzing trace with hash 855725686, now seen corresponding path program 1 times [2020-12-23 07:46:25,805 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:46:25,805 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1516032129] [2020-12-23 07:46:25,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:46:25,823 ERROR L270 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2020-12-23 07:46:25,824 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1148151934] [2020-12-23 07:46:25,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:46:25,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:46:25,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-23 07:46:25,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:46:25,981 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:46:25,982 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1516032129] [2020-12-23 07:46:25,982 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-23 07:46:25,982 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148151934] [2020-12-23 07:46:25,983 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-12-23 07:46:25,983 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-12-23 07:46:25,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726547952] [2020-12-23 07:46:25,985 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 07:46:25,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:46:25,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 07:46:25,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-23 07:46:25,987 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 6 states. [2020-12-23 07:46:26,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:46:26,049 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2020-12-23 07:46:26,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 07:46:26,050 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2020-12-23 07:46:26,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:46:26,051 INFO L225 Difference]: With dead ends: 29 [2020-12-23 07:46:26,051 INFO L226 Difference]: Without dead ends: 23 [2020-12-23 07:46:26,052 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-23 07:46:26,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-23 07:46:26,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-12-23 07:46:26,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-23 07:46:26,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-12-23 07:46:26,058 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 10 [2020-12-23 07:46:26,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:46:26,059 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-12-23 07:46:26,059 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 07:46:26,059 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-12-23 07:46:26,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-12-23 07:46:26,060 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:46:26,060 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1] [2020-12-23 07:46:26,275 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:46:26,276 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:46:26,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:46:26,278 INFO L82 PathProgramCache]: Analyzing trace with hash -1778536670, now seen corresponding path program 2 times [2020-12-23 07:46:26,278 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:46:26,279 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [658386232] [2020-12-23 07:46:26,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:46:26,294 ERROR L270 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2020-12-23 07:46:26,294 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [11791859] [2020-12-23 07:46:26,295 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:46:26,360 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 07:46:26,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:46:26,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 30 conjunts are in the unsatisfiable core [2020-12-23 07:46:26,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:46:26,524 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:46:26,524 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [658386232] [2020-12-23 07:46:26,525 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-23 07:46:26,525 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11791859] [2020-12-23 07:46:26,529 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-12-23 07:46:26,529 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-12-23 07:46:26,529 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471932079] [2020-12-23 07:46:26,530 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-23 07:46:26,530 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:46:26,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-23 07:46:26,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-12-23 07:46:26,532 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 8 states. [2020-12-23 07:46:40,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:46:40,762 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2020-12-23 07:46:40,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-23 07:46:40,763 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2020-12-23 07:46:40,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:46:40,764 INFO L225 Difference]: With dead ends: 33 [2020-12-23 07:46:40,764 INFO L226 Difference]: Without dead ends: 31 [2020-12-23 07:46:40,765 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-12-23 07:46:40,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-23 07:46:40,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 23. [2020-12-23 07:46:40,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-23 07:46:40,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-12-23 07:46:40,771 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 14 [2020-12-23 07:46:40,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:46:40,772 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-12-23 07:46:40,772 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-23 07:46:40,772 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-12-23 07:46:40,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-23 07:46:40,773 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:46:40,773 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 07:46:40,988 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:46:40,989 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:46:40,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:46:40,991 INFO L82 PathProgramCache]: Analyzing trace with hash 699894435, now seen corresponding path program 1 times [2020-12-23 07:46:40,991 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:46:40,992 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [884675189] [2020-12-23 07:46:40,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:46:41,010 ERROR L270 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2020-12-23 07:46:41,011 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [255340518] [2020-12-23 07:46:41,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:46:41,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:46:41,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 07:46:41,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:46:41,151 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:46:41,152 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [884675189] [2020-12-23 07:46:41,152 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-23 07:46:41,153 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [255340518] [2020-12-23 07:46:41,153 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-12-23 07:46:41,153 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-12-23 07:46:41,153 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142108884] [2020-12-23 07:46:41,154 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 07:46:41,154 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:46:41,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 07:46:41,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-12-23 07:46:41,155 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 6 states. [2020-12-23 07:46:41,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:46:41,193 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2020-12-23 07:46:41,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-23 07:46:41,194 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-12-23 07:46:41,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:46:41,195 INFO L225 Difference]: With dead ends: 27 [2020-12-23 07:46:41,195 INFO L226 Difference]: Without dead ends: 23 [2020-12-23 07:46:41,195 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2020-12-23 07:46:41,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-23 07:46:41,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-12-23 07:46:41,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-23 07:46:41,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-12-23 07:46:41,200 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 15 [2020-12-23 07:46:41,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:46:41,201 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-12-23 07:46:41,201 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 07:46:41,201 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-12-23 07:46:41,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-23 07:46:41,202 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:46:41,202 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 07:46:41,403 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:46:41,403 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:46:41,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:46:41,405 INFO L82 PathProgramCache]: Analyzing trace with hash -1664485700, now seen corresponding path program 1 times [2020-12-23 07:46:41,406 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:46:41,406 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [66598592] [2020-12-23 07:46:41,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:46:41,420 ERROR L270 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2020-12-23 07:46:41,420 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [757574238] [2020-12-23 07:46:41,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:46:41,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:46:41,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-23 07:46:41,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:46:41,576 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-12-23 07:46:41,577 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [66598592] [2020-12-23 07:46:41,577 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-23 07:46:41,577 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [757574238] [2020-12-23 07:46:41,578 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 07:46:41,578 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-23 07:46:41,578 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927434782] [2020-12-23 07:46:41,578 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-23 07:46:41,579 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:46:41,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-23 07:46:41,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-23 07:46:41,580 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 5 states. [2020-12-23 07:46:45,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:46:45,653 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-12-23 07:46:45,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 07:46:45,654 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-12-23 07:46:45,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:46:45,654 INFO L225 Difference]: With dead ends: 27 [2020-12-23 07:46:45,655 INFO L226 Difference]: Without dead ends: 23 [2020-12-23 07:46:45,655 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-12-23 07:46:45,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-23 07:46:45,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-12-23 07:46:45,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-23 07:46:45,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-12-23 07:46:45,661 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 17 [2020-12-23 07:46:45,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:46:45,661 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-12-23 07:46:45,661 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-23 07:46:45,661 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-12-23 07:46:45,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-12-23 07:46:45,662 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:46:45,662 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1] [2020-12-23 07:46:45,863 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:46:45,864 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:46:45,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:46:45,865 INFO L82 PathProgramCache]: Analyzing trace with hash -58338866, now seen corresponding path program 3 times [2020-12-23 07:46:45,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:46:45,866 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282337952] [2020-12-23 07:46:45,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:46:45,889 ERROR L270 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2020-12-23 07:46:45,890 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1824104649] [2020-12-23 07:46:45,890 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:46:45,950 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-12-23 07:46:45,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:46:45,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-23 07:46:45,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:46:48,157 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 07:46:50,173 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 07:47:03,561 WARN L197 SmtUtils]: Spent 8.19 s on a formula simplification that was a NOOP. DAG size: 33 [2020-12-23 07:47:09,673 WARN L838 $PredicateComparison]: unable to prove that (exists ((ULTIMATE.start_main_~z~0 Int) (ULTIMATE.start_main_~x~0 Int) (ULTIMATE.start_main_~y~0 Int)) (let ((.cse0 (+ ULTIMATE.start_main_~x~0 (- 1)))) (and (= (mod ULTIMATE.start_main_~y~0 ULTIMATE.start_main_~z~0) 0) (= (mod .cse0 ULTIMATE.start_main_~z~0) 0) (let ((.cse1 (div .cse0 ULTIMATE.start_main_~z~0))) (= (+ (* ULTIMATE.start_main_~z~0 (div ULTIMATE.start_main_~y~0 ULTIMATE.start_main_~z~0)) .cse1) (+ (* .cse1 ULTIMATE.start_main_~z~0) 1))) (not (= ULTIMATE.start_main_~z~0 0)) (not (= (+ ULTIMATE.start_main_~x~0 (* ULTIMATE.start_main_~z~0 ULTIMATE.start_main_~y~0)) (+ (* ULTIMATE.start_main_~z~0 ULTIMATE.start_main_~x~0) 1)))))) is different from false [2020-12-23 07:47:09,689 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-12-23 07:47:09,689 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282337952] [2020-12-23 07:47:09,690 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-23 07:47:09,690 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1824104649] [2020-12-23 07:47:09,690 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-12-23 07:47:09,691 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-12-23 07:47:09,691 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475772854] [2020-12-23 07:47:09,691 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 07:47:09,691 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:47:09,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 07:47:09,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=21, Unknown=2, NotChecked=8, Total=42 [2020-12-23 07:47:09,693 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 7 states. [2020-12-23 07:47:22,110 WARN L197 SmtUtils]: Spent 8.33 s on a formula simplification. DAG size of input: 37 DAG size of output: 12 [2020-12-23 07:47:41,645 WARN L197 SmtUtils]: Spent 8.22 s on a formula simplification that was a NOOP. DAG size: 38 [2020-12-23 07:48:52,795 WARN L197 SmtUtils]: Spent 56.60 s on a formula simplification. DAG size of input: 41 DAG size of output: 37 [2020-12-23 07:49:27,893 WARN L197 SmtUtils]: Spent 30.83 s on a formula simplification. DAG size of input: 41 DAG size of output: 29 [2020-12-23 07:49:42,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:49:42,063 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-12-23 07:49:42,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-23 07:49:42,075 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-12-23 07:49:42,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:49:42,076 INFO L225 Difference]: With dead ends: 23 [2020-12-23 07:49:42,077 INFO L226 Difference]: Without dead ends: 21 [2020-12-23 07:49:42,078 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 138.7s TimeCoverageRelationStatistics Valid=35, Invalid=47, Unknown=12, NotChecked=16, Total=110 [2020-12-23 07:49:42,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-23 07:49:42,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2020-12-23 07:49:42,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-23 07:49:42,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-12-23 07:49:42,086 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-12-23 07:49:42,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:49:42,086 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-12-23 07:49:42,086 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 07:49:42,086 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-12-23 07:49:42,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-23 07:49:42,087 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:49:42,087 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1] [2020-12-23 07:49:42,291 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:49:42,292 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:49:42,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:49:42,292 INFO L82 PathProgramCache]: Analyzing trace with hash -1808548489, now seen corresponding path program 2 times [2020-12-23 07:49:42,293 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:49:42,293 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845742508] [2020-12-23 07:49:42,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:49:42,305 ERROR L270 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2020-12-23 07:49:42,306 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1260345063] [2020-12-23 07:49:42,306 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:49:42,351 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 07:49:42,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:49:42,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-23 07:49:42,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:49:42,480 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:49:42,481 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845742508] [2020-12-23 07:49:42,481 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-23 07:49:42,481 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260345063] [2020-12-23 07:49:42,481 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-12-23 07:49:42,481 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-12-23 07:49:42,482 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514419626] [2020-12-23 07:49:42,482 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 07:49:42,482 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:49:42,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 07:49:42,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-12-23 07:49:42,483 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2020-12-23 07:49:42,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:49:42,598 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-12-23 07:49:42,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-23 07:49:42,599 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-12-23 07:49:42,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:49:42,600 INFO L225 Difference]: With dead ends: 28 [2020-12-23 07:49:42,600 INFO L226 Difference]: Without dead ends: 24 [2020-12-23 07:49:42,601 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2020-12-23 07:49:42,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-23 07:49:42,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-12-23 07:49:42,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-23 07:49:42,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-12-23 07:49:42,609 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 19 [2020-12-23 07:49:42,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:49:42,609 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-12-23 07:49:42,609 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 07:49:42,610 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-12-23 07:49:42,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-23 07:49:42,610 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:49:42,611 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1] [2020-12-23 07:49:42,811 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:49:42,812 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:49:42,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:49:42,813 INFO L82 PathProgramCache]: Analyzing trace with hash 754083403, now seen corresponding path program 3 times [2020-12-23 07:49:42,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:49:42,814 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805482447] [2020-12-23 07:49:42,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:49:42,825 ERROR L270 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2020-12-23 07:49:42,825 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [839868800] [2020-12-23 07:49:42,826 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:49:42,881 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-12-23 07:49:42,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:49:42,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-23 07:49:42,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:49:44,145 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 07:49:44,864 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-23 07:49:44,864 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805482447] [2020-12-23 07:49:44,865 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-23 07:49:44,865 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839868800] [2020-12-23 07:49:44,865 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 07:49:44,865 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-23 07:49:44,865 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326313492] [2020-12-23 07:49:44,866 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 07:49:44,866 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:49:44,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 07:49:44,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-12-23 07:49:44,867 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 6 states. [2020-12-23 07:50:00,357 WARN L197 SmtUtils]: Spent 8.95 s on a formula simplification that was a NOOP. DAG size: 37 [2020-12-23 07:50:17,821 WARN L197 SmtUtils]: Spent 17.44 s on a formula simplification. DAG size of input: 37 DAG size of output: 31 [2020-12-23 07:50:18,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:50:18,839 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-12-23 07:50:18,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 07:50:18,841 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2020-12-23 07:50:18,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:50:18,842 INFO L225 Difference]: With dead ends: 24 [2020-12-23 07:50:18,842 INFO L226 Difference]: Without dead ends: 0 [2020-12-23 07:50:18,843 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 28.9s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-12-23 07:50:18,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-12-23 07:50:18,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-12-23 07:50:18,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-12-23 07:50:18,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-12-23 07:50:18,845 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 23 [2020-12-23 07:50:18,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:50:18,845 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-23 07:50:18,845 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 07:50:18,845 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-12-23 07:50:18,845 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-12-23 07:50:19,048 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2020-12-23 07:50:19,052 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-12-23 07:50:19,840 WARN L197 SmtUtils]: Spent 714.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 34 [2020-12-23 07:50:27,891 WARN L197 SmtUtils]: Spent 8.05 s on a formula simplification. DAG size of input: 48 DAG size of output: 36 [2020-12-23 07:50:27,893 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-12-23 07:50:27,893 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION(line 17) no Hoare annotation was computed. [2020-12-23 07:50:27,894 INFO L189 CegarLoopUtils]: For program point L15(lines 15 18) no Hoare annotation was computed. [2020-12-23 07:50:27,894 INFO L185 CegarLoopUtils]: At program point L15-2(lines 37 38) the Hoare annotation is: (let ((.cse0 (= 1 ULTIMATE.start___VERIFIER_assert_~cond)) (.cse1 (= (+ (* ULTIMATE.start_main_~z~0 ULTIMATE.start_main_~y~0) ULTIMATE.start_main_~x~0) (+ (* ULTIMATE.start_main_~z~0 ULTIMATE.start_main_~x~0) 1)))) (or (and .cse0 .cse1 (or (let ((.cse2 (+ ULTIMATE.start_main_~x~0 (- 1)))) (and (= (mod ULTIMATE.start_main_~y~0 ULTIMATE.start_main_~z~0) 0) (= (mod .cse2 ULTIMATE.start_main_~z~0) 0) (let ((.cse3 (div .cse2 ULTIMATE.start_main_~z~0))) (= (+ (* ULTIMATE.start_main_~z~0 (div ULTIMATE.start_main_~y~0 ULTIMATE.start_main_~z~0)) .cse3) (+ (* .cse3 ULTIMATE.start_main_~z~0) 1))) (not (= ULTIMATE.start_main_~z~0 0)))) (= ULTIMATE.start_main_~y~0 0))) (and (<= ~counter~0 1) .cse0 .cse1 (= ULTIMATE.start_main_~y~0 1)))) [2020-12-23 07:50:27,894 INFO L189 CegarLoopUtils]: For program point L15-3(lines 15 18) no Hoare annotation was computed. [2020-12-23 07:50:27,894 INFO L192 CegarLoopUtils]: At program point L15-5(lines 14 20) the Hoare annotation is: true [2020-12-23 07:50:27,895 INFO L189 CegarLoopUtils]: For program point L34-1(lines 34 43) no Hoare annotation was computed. [2020-12-23 07:50:27,895 INFO L189 CegarLoopUtils]: For program point L-1(line -1) no Hoare annotation was computed. [2020-12-23 07:50:27,895 INFO L185 CegarLoopUtils]: At program point L34-3(lines 34 43) the Hoare annotation is: (let ((.cse0 (= ULTIMATE.start_main_~x~0 1))) (or (let ((.cse1 (= ULTIMATE.start_main_~z~0 0))) (let ((.cse2 (let ((.cse3 (+ ULTIMATE.start_main_~x~0 (- 1)))) (and (= (mod ULTIMATE.start_main_~y~0 ULTIMATE.start_main_~z~0) 0) (= (mod .cse3 ULTIMATE.start_main_~z~0) 0) (let ((.cse4 (div .cse3 ULTIMATE.start_main_~z~0))) (= (+ (* ULTIMATE.start_main_~z~0 (div ULTIMATE.start_main_~y~0 ULTIMATE.start_main_~z~0)) .cse4) (+ (* .cse4 ULTIMATE.start_main_~z~0) 1))) (not .cse1))))) (and (= 1 ULTIMATE.start___VERIFIER_assert_~cond) (or (and .cse0 .cse1) .cse2) (or .cse2 (= ULTIMATE.start_main_~y~0 0))))) (and .cse0 (<= ~counter~0 0) (= ULTIMATE.start_main_~y~0 1)))) [2020-12-23 07:50:27,896 INFO L189 CegarLoopUtils]: For program point L34-4(lines 34 43) no Hoare annotation was computed. [2020-12-23 07:50:27,896 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-12-23 07:50:27,896 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-12-23 07:50:27,896 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 17) no Hoare annotation was computed. [2020-12-23 07:50:27,896 INFO L189 CegarLoopUtils]: For program point L16(lines 16 17) no Hoare annotation was computed. [2020-12-23 07:50:27,896 INFO L189 CegarLoopUtils]: For program point L16-1(lines 16 17) no Hoare annotation was computed. [2020-12-23 07:50:27,896 INFO L192 CegarLoopUtils]: At program point L45(lines 24 46) the Hoare annotation is: true [2020-12-23 07:50:27,939 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.12 07:50:27 BoogieIcfgContainer [2020-12-23 07:50:27,939 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-23 07:50:27,940 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-23 07:50:27,940 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-23 07:50:27,941 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-23 07:50:27,941 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 07:46:24" (3/4) ... [2020-12-23 07:50:27,944 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-12-23 07:50:27,953 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2020-12-23 07:50:27,953 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2020-12-23 07:50:27,954 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-23 07:50:27,954 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-23 07:50:28,003 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/nla-digbench-scaling/geo2-ll_unwindbound5.c-witness.graphml [2020-12-23 07:50:28,003 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-23 07:50:28,004 INFO L168 Benchmark]: Toolchain (without parser) took 243773.69 ms. Allocated memory was 174.1 MB in the beginning and 213.9 MB in the end (delta: 39.8 MB). Free memory was 149.0 MB in the beginning and 106.9 MB in the end (delta: 42.2 MB). Peak memory consumption was 82.5 MB. Max. memory is 8.0 GB. [2020-12-23 07:50:28,005 INFO L168 Benchmark]: CDTParser took 1.85 ms. Allocated memory is still 174.1 MB. Free memory is still 146.5 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-12-23 07:50:28,005 INFO L168 Benchmark]: CACSL2BoogieTranslator took 252.96 ms. Allocated memory is still 174.1 MB. Free memory was 148.8 MB in the beginning and 139.2 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-12-23 07:50:28,006 INFO L168 Benchmark]: Boogie Procedure Inliner took 37.33 ms. Allocated memory is still 174.1 MB. Free memory was 139.1 MB in the beginning and 137.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-12-23 07:50:28,007 INFO L168 Benchmark]: Boogie Preprocessor took 23.43 ms. Allocated memory is still 174.1 MB. Free memory was 137.6 MB in the beginning and 136.5 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-23 07:50:28,007 INFO L168 Benchmark]: RCFGBuilder took 325.93 ms. Allocated memory is still 174.1 MB. Free memory was 136.5 MB in the beginning and 124.0 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-12-23 07:50:28,008 INFO L168 Benchmark]: TraceAbstraction took 243056.76 ms. Allocated memory was 174.1 MB in the beginning and 213.9 MB in the end (delta: 39.8 MB). Free memory was 123.6 MB in the beginning and 109.5 MB in the end (delta: 14.1 MB). Peak memory consumption was 55.3 MB. Max. memory is 8.0 GB. [2020-12-23 07:50:28,008 INFO L168 Benchmark]: Witness Printer took 62.93 ms. Allocated memory is still 213.9 MB. Free memory was 109.5 MB in the beginning and 106.9 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-12-23 07:50:28,012 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.85 ms. Allocated memory is still 174.1 MB. Free memory is still 146.5 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 252.96 ms. Allocated memory is still 174.1 MB. Free memory was 148.8 MB in the beginning and 139.2 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 37.33 ms. Allocated memory is still 174.1 MB. Free memory was 139.1 MB in the beginning and 137.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 23.43 ms. Allocated memory is still 174.1 MB. Free memory was 137.6 MB in the beginning and 136.5 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 325.93 ms. Allocated memory is still 174.1 MB. Free memory was 136.5 MB in the beginning and 124.0 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 243056.76 ms. Allocated memory was 174.1 MB in the beginning and 213.9 MB in the end (delta: 39.8 MB). Free memory was 123.6 MB in the beginning and 109.5 MB in the end (delta: 14.1 MB). Peak memory consumption was 55.3 MB. Max. memory is 8.0 GB. * Witness Printer took 62.93 ms. Allocated memory is still 213.9 MB. Free memory was 109.5 MB in the beginning and 106.9 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 17]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - PositiveResult [Line: 17]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - AllSpecificationsHoldResult: All specifications hold 2 specifications checked. All of them hold - InvariantResult [Line: 34]: Loop Invariant Derived loop invariant: ((1 == cond && ((x == 1 && z == 0) || (((y % z == 0 && (x + -1) % z == 0) && z * (y / z) + (x + -1) / z == (x + -1) / z * z + 1) && !(z == 0)))) && ((((y % z == 0 && (x + -1) % z == 0) && z * (y / z) + (x + -1) / z == (x + -1) / z * z + 1) && !(z == 0)) || y == 0)) || ((x == 1 && counter <= 0) && y == 1) - InvariantResult [Line: 14]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 37]: Loop Invariant Derived loop invariant: ((1 == cond && z * y + x == z * x + 1) && ((((y % z == 0 && (x + -1) % z == 0) && z * (y / z) + (x + -1) / z == (x + -1) / z * z + 1) && !(z == 0)) || y == 0)) || (((counter <= 1 && 1 == cond) && z * y + x == z * x + 1) && y == 1) - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 16 locations, 2 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 234.0s, OverallIterations: 8, TraceHistogramMax: 5, AutomataDifference: 205.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 8.8s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 75 SDtfs, 83 SDslu, 188 SDs, 0 SdLazy, 157 SolverSat, 41 SolverUnsat, 24 SolverUnknown, 0 SolverNotchecked, 51.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 134 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 168.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=7, 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, 8 MinimizatonAttempts, 15 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 4 LocationsWithAnnotation, 4 PreInvPairs, 17 NumberOfFragments, 184 HoareAnnotationTreeSize, 4 FomulaSimplifications, 252 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 4 FomulaSimplificationsInter, 562 FormulaSimplificationTreeSizeReductionInter, 8.7s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 26.3s InterpolantComputationTime, 122 NumberOfCodeBlocks, 102 NumberOfCodeBlocksAsserted, 12 NumberOfCheckSat, 114 ConstructedInterpolants, 2 QuantifiedInterpolants, 13232 SizeOfPredicates, 45 NumberOfNonLiveVariables, 682 ConjunctsInSsa, 126 ConjunctsInUnsatCore, 8 InterpolantComputations, 3 PerfectInterpolantSequences, 64/104 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! [MP z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forcibly destroying the process Received shutdown request...