/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/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 22:00:02,104 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 22:00:02,107 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 22:00:02,149 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-10-23 22:00:02,197 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 22:00:02,198 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 22:00:02,199 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 22:00:02,201 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-10-23 22:00:02,215 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 22:00:02,223 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 22:00:02,229 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 22:00:02,230 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 22:00:02,230 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 22:00:02,231 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 22:00:02,231 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 22:00:02,231 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 22:00:02,232 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 22:00:02,232 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 22:00:02,232 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 22:00:02,232 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 22:00:02,232 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 22:00:02,233 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 22:00:02,236 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 22:00:02,236 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-23 22:00:02,236 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 22:00:02,237 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 22:00:02,237 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 22:00:02,237 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 22:00:02,237 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-23 22:00:02,237 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 22:00:02,237 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 22:00:02,624 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 22:00:02,656 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 22:00:02,660 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 22:00:02,662 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 22:00:02,662 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 22:00:02,663 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-10-23 22:00:02,770 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/399997859/4d447c1f58414b68979c408cd58deec4/FLAGa903de168 [2020-10-23 22:00:03,587 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 22:00:03,589 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-10-23 22:00:03,600 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/399997859/4d447c1f58414b68979c408cd58deec4/FLAGa903de168 [2020-10-23 22:00:03,921 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/399997859/4d447c1f58414b68979c408cd58deec4 [2020-10-23 22:00:03,924 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 22:00:03,933 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 22:00:03,935 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 22:00:03,936 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 22:00:03,943 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 22:00:03,945 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 10:00:03" (1/1) ... [2020-10-23 22:00:03,950 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@42e50e4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:00:03, skipping insertion in model container [2020-10-23 22:00:03,950 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 10:00:03" (1/1) ... [2020-10-23 22:00:03,963 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 22:00:03,988 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 22:00:04,219 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 22:00:04,231 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 22:00:04,255 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 22:00:04,274 INFO L208 MainTranslator]: Completed translation [2020-10-23 22:00:04,275 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:00:04 WrapperNode [2020-10-23 22:00:04,275 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 22:00:04,277 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 22:00:04,277 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 22:00:04,277 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 22:00:04,292 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:00:04" (1/1) ... [2020-10-23 22:00:04,293 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:00:04" (1/1) ... [2020-10-23 22:00:04,302 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:00:04" (1/1) ... [2020-10-23 22:00:04,303 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:00:04" (1/1) ... [2020-10-23 22:00:04,311 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:00:04" (1/1) ... [2020-10-23 22:00:04,317 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:00:04" (1/1) ... [2020-10-23 22:00:04,319 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:00:04" (1/1) ... [2020-10-23 22:00:04,322 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 22:00:04,323 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 22:00:04,323 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 22:00:04,323 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 22:00:04,325 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:00:04" (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 [2020-10-23 22:00:04,426 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 22:00:04,427 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 22:00:04,427 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 22:00:04,428 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-10-23 22:00:04,428 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-23 22:00:04,428 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 22:00:04,429 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 22:00:04,429 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 22:00:04,429 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2020-10-23 22:00:04,429 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2020-10-23 22:00:04,430 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 22:00:04,430 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 22:00:04,431 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-10-23 22:00:04,431 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-23 22:00:04,431 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-23 22:00:04,431 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 22:00:04,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 22:00:04,432 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 22:00:04,433 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 22:00:04,433 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 22:00:04,434 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 22:00:04,434 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 22:00:04,767 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 22:00:04,768 INFO L298 CfgBuilder]: Removed 3 assume(true) statements. [2020-10-23 22:00:04,771 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 10:00:04 BoogieIcfgContainer [2020-10-23 22:00:04,771 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 22:00:04,774 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 22:00:04,774 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 22:00:04,780 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 22:00:04,781 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 10:00:03" (1/3) ... [2020-10-23 22:00:04,782 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c2610a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 10:00:04, skipping insertion in model container [2020-10-23 22:00:04,783 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:00:04" (2/3) ... [2020-10-23 22:00:04,783 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c2610a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 10:00:04, skipping insertion in model container [2020-10-23 22:00:04,783 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 10:00:04" (3/3) ... [2020-10-23 22:00:04,785 INFO L111 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2020-10-23 22:00:04,803 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-23 22:00:04,818 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 22:00:04,855 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 22:00:04,915 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 22:00:04,915 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 22:00:04,915 INFO L379 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-10-23 22:00:04,915 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 22:00:04,915 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 22:00:04,916 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 22:00:04,916 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 22:00:04,916 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 22:00:04,939 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states. [2020-10-23 22:00:04,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-23 22:00:04,953 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 22:00:04,954 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 22:00:04,954 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 22:00:04,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 22:00:04,963 INFO L82 PathProgramCache]: Analyzing trace with hash -77372705, now seen corresponding path program 1 times [2020-10-23 22:00:04,974 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 22:00:04,974 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1962279165] [2020-10-23 22:00:04,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 22:00:05,088 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 22:00:05,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:00:05,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 22:00:05,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:00:05,376 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 22:00:05,378 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1962279165] [2020-10-23 22:00:05,381 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 22:00:05,381 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-23 22:00:05,385 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690446145] [2020-10-23 22:00:05,394 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-23 22:00:05,394 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 22:00:05,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-23 22:00:05,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 22:00:05,420 INFO L87 Difference]: Start difference. First operand 60 states. Second operand 3 states. [2020-10-23 22:00:05,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 22:00:05,602 INFO L93 Difference]: Finished difference Result 91 states and 109 transitions. [2020-10-23 22:00:05,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-23 22:00:05,605 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 33 [2020-10-23 22:00:05,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 22:00:05,614 INFO L225 Difference]: With dead ends: 91 [2020-10-23 22:00:05,614 INFO L226 Difference]: Without dead ends: 51 [2020-10-23 22:00:05,619 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 22:00:05,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-10-23 22:00:05,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-10-23 22:00:05,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-10-23 22:00:05,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-10-23 22:00:05,677 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 33 [2020-10-23 22:00:05,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 22:00:05,678 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-10-23 22:00:05,678 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-23 22:00:05,678 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-10-23 22:00:05,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-10-23 22:00:05,680 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 22:00:05,681 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 22:00:05,681 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 22:00:05,681 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 22:00:05,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 22:00:05,683 INFO L82 PathProgramCache]: Analyzing trace with hash 1541004353, now seen corresponding path program 1 times [2020-10-23 22:00:05,683 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 22:00:05,684 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [677506133] [2020-10-23 22:00:05,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 22:00:05,688 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 22:00:05,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:00:06,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 22:00:06,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:00:06,074 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 22:00:06,078 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [677506133] [2020-10-23 22:00:06,078 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 22:00:06,078 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 22:00:06,079 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683104928] [2020-10-23 22:00:06,083 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 22:00:06,084 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 22:00:06,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 22:00:06,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 22:00:06,089 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 6 states. [2020-10-23 22:00:06,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 22:00:06,542 INFO L93 Difference]: Finished difference Result 62 states and 65 transitions. [2020-10-23 22:00:06,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-23 22:00:06,543 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 37 [2020-10-23 22:00:06,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 22:00:06,545 INFO L225 Difference]: With dead ends: 62 [2020-10-23 22:00:06,545 INFO L226 Difference]: Without dead ends: 58 [2020-10-23 22:00:06,547 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-10-23 22:00:06,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-10-23 22:00:06,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-10-23 22:00:06,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-10-23 22:00:06,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-10-23 22:00:06,571 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 37 [2020-10-23 22:00:06,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 22:00:06,571 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-10-23 22:00:06,572 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 22:00:06,572 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-10-23 22:00:06,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-10-23 22:00:06,574 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 22:00:06,574 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 22:00:06,574 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 22:00:06,575 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 22:00:06,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 22:00:06,576 INFO L82 PathProgramCache]: Analyzing trace with hash -551766036, now seen corresponding path program 1 times [2020-10-23 22:00:06,576 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 22:00:06,576 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [535479556] [2020-10-23 22:00:06,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 22:00:09,082 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 94 [2020-10-23 22:00:09,128 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-23 22:00:09,152 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation PRECISE [2020-10-23 22:00:09,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:00:09,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 22:00:09,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:00:09,408 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 22:00:09,518 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [535479556] [2020-10-23 22:00:09,519 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 22:00:09,519 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-10-23 22:00:09,519 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574076452] [2020-10-23 22:00:09,520 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-23 22:00:09,520 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 22:00:09,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-23 22:00:09,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2020-10-23 22:00:09,522 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 12 states. [2020-10-23 22:00:10,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 22:00:10,124 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-10-23 22:00:10,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-23 22:00:10,125 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 47 [2020-10-23 22:00:10,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 22:00:10,129 INFO L225 Difference]: With dead ends: 98 [2020-10-23 22:00:10,129 INFO L226 Difference]: Without dead ends: 71 [2020-10-23 22:00:10,131 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=102, Invalid=318, Unknown=0, NotChecked=0, Total=420 [2020-10-23 22:00:10,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-10-23 22:00:10,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 59. [2020-10-23 22:00:10,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-10-23 22:00:10,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-10-23 22:00:10,148 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 47 [2020-10-23 22:00:10,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 22:00:10,148 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-10-23 22:00:10,148 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-23 22:00:10,148 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-10-23 22:00:10,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-10-23 22:00:10,151 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 22:00:10,151 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 22:00:10,151 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 22:00:10,151 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 22:00:10,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 22:00:10,152 INFO L82 PathProgramCache]: Analyzing trace with hash -333827980, now seen corresponding path program 1 times [2020-10-23 22:00:10,152 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 22:00:10,153 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1139995558] [2020-10-23 22:00:10,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 22:00:12,590 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 94 [2020-10-23 22:00:12,613 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation PRECISE [2020-10-23 22:00:16,921 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 64 [2020-10-23 22:00:16,936 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 22:00:21,130 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 22:00:21,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 22:00:21,228 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 22:00:21,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 22:00:21,316 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 22:00:21,366 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-23 22:00:21,366 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 22:00:21,369 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-23 22:00:21,393 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 10:00:21 BoogieIcfgContainer [2020-10-23 22:00:21,394 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 22:00:21,400 INFO L168 Benchmark]: Toolchain (without parser) took 17468.24 ms. Allocated memory was 165.7 MB in the beginning and 199.2 MB in the end (delta: 33.6 MB). Free memory was 142.8 MB in the beginning and 113.0 MB in the end (delta: 29.8 MB). Peak memory consumption was 63.6 MB. Max. memory is 8.0 GB. [2020-10-23 22:00:21,402 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 125.8 MB. Free memory was 103.5 MB in the beginning and 103.5 MB in the end (delta: 61.4 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 22:00:21,405 INFO L168 Benchmark]: CACSL2BoogieTranslator took 340.53 ms. Allocated memory is still 165.7 MB. Free memory was 142.2 MB in the beginning and 132.2 MB in the end (delta: 10.0 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-23 22:00:21,407 INFO L168 Benchmark]: Boogie Preprocessor took 45.23 ms. Allocated memory is still 165.7 MB. Free memory was 132.2 MB in the beginning and 130.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-10-23 22:00:21,409 INFO L168 Benchmark]: RCFGBuilder took 448.47 ms. Allocated memory is still 165.7 MB. Free memory was 130.7 MB in the beginning and 141.2 MB in the end (delta: -10.6 MB). Peak memory consumption was 13.0 MB. Max. memory is 8.0 GB. [2020-10-23 22:00:21,417 INFO L168 Benchmark]: TraceAbstraction took 16620.12 ms. Allocated memory was 165.7 MB in the beginning and 199.2 MB in the end (delta: 33.6 MB). Free memory was 140.8 MB in the beginning and 113.0 MB in the end (delta: 27.8 MB). Peak memory consumption was 61.1 MB. Max. memory is 8.0 GB. [2020-10-23 22:00:21,424 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 125.8 MB. Free memory was 103.5 MB in the beginning and 103.5 MB in the end (delta: 61.4 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 340.53 ms. Allocated memory is still 165.7 MB. Free memory was 142.2 MB in the beginning and 132.2 MB in the end (delta: 10.0 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 45.23 ms. Allocated memory is still 165.7 MB. Free memory was 132.2 MB in the beginning and 130.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 448.47 ms. Allocated memory is still 165.7 MB. Free memory was 130.7 MB in the beginning and 141.2 MB in the end (delta: -10.6 MB). Peak memory consumption was 13.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 16620.12 ms. Allocated memory was 165.7 MB in the beginning and 199.2 MB in the end (delta: 33.6 MB). Free memory was 140.8 MB in the beginning and 113.0 MB in the end (delta: 27.8 MB). Peak memory consumption was 61.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 12]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L25] int i,pvlen ; [L26] int tmp___1 ; [L27] int k = 0; [L28] int n; [L29] i = 0 [L30] pvlen = __VERIFIER_nondet_int() [L31] COND FALSE !(__VERIFIER_nondet_int() && i <= 1000000) [L34] COND FALSE !(i > pvlen) [L37] i = 0 [L38] COND TRUE __VERIFIER_nondet_int() && i <= 1000000 [L39] tmp___1 = i [L40] i = i + 1 [L41] k = k + 1 [L38] COND FALSE !(__VERIFIER_nondet_int() && i <= 1000000) [L43] int j = 0; [L44] n = i [L45] COND TRUE 1 [L46] CALL __VERIFIER_assert(k >= 0) [L18] COND FALSE !(!(cond)) [L46] RET __VERIFIER_assert(k >= 0) [L47] k = k -1 [L48] i = i - 1 [L49] j = j + 1 [L50] COND FALSE !(j >= n) [L45] COND TRUE 1 [L46] CALL __VERIFIER_assert(k >= 0) [L18] COND TRUE !(cond) [L19] CALL reach_error() [L12] COND FALSE !(0) [L12] __assert_fail ("0", "assert.h", 3, __extension__ __PRETTY_FUNCTION__) - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 65 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 16.4s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 1.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 144 SDtfs, 214 SDslu, 98 SDs, 0 SdLazy, 349 SolverSat, 38 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 48 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=60occurred in iteration=0, 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, 3 MinimizatonAttempts, 13 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, 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 incorrect! Received shutdown request...