/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/functions_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:24:39,059 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:24:39,074 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:24:39,103 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:24:39,115 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 11:24:39,116 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 11:24:39,116 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 11:24:39,117 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 11:24:39,117 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 11:24:39,118 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 11:24:39,119 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 11:24:39,120 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 11:24:39,121 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 11:24:39,121 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 11:24:39,122 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 11:24:39,123 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 11:24:39,124 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 11:24:39,129 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:24:39,129 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:24:39,130 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:24:39,130 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-06 11:24:39,137 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:24:39,138 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:24:39,139 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:24:39,139 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:24:39,139 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:24:39,139 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:24:39,139 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:24:39,139 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:24:39,139 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:24:39,139 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:24:39,140 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:24:39,140 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:24:39,140 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:24:39,140 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:24:39,140 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:24:39,140 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:24:39,140 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:24:39,140 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:24:39,141 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:24:39,141 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:24:39,141 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:24:39,141 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:24:39,141 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:24:39,141 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:24:39,350 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:24:39,376 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:24:39,378 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:24:39,379 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:24:39,381 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:24:39,382 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/functions_1-2.c [2021-05-06 11:24:39,440 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/79ae9ca09/1efb6c83d0be43cda51d1c765fcd93ab/FLAG96c38fff7 [2021-05-06 11:24:39,837 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:24:39,837 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/functions_1-2.c [2021-05-06 11:24:39,841 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/79ae9ca09/1efb6c83d0be43cda51d1c765fcd93ab/FLAG96c38fff7 [2021-05-06 11:24:39,851 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/79ae9ca09/1efb6c83d0be43cda51d1c765fcd93ab [2021-05-06 11:24:39,853 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:24:39,855 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:24:39,858 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:24:39,858 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:24:39,861 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:24:39,862 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:24:39" (1/1) ... [2021-05-06 11:24:39,862 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@67256e4a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:39, skipping insertion in model container [2021-05-06 11:24:39,862 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:24:39" (1/1) ... [2021-05-06 11:24:39,867 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:24:39,879 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:24:39,963 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/functions_1-2.c[325,338] [2021-05-06 11:24:39,969 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:24:39,974 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:24:40,007 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/functions_1-2.c[325,338] [2021-05-06 11:24:40,009 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:24:40,022 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:24:40,023 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:40 WrapperNode [2021-05-06 11:24:40,023 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:24:40,023 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:24:40,024 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:24:40,024 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:24:40,060 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:40" (1/1) ... [2021-05-06 11:24:40,060 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:40" (1/1) ... [2021-05-06 11:24:40,067 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:40" (1/1) ... [2021-05-06 11:24:40,068 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:40" (1/1) ... [2021-05-06 11:24:40,075 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:40" (1/1) ... [2021-05-06 11:24:40,080 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:40" (1/1) ... [2021-05-06 11:24:40,085 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:40" (1/1) ... [2021-05-06 11:24:40,088 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:24:40,089 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:24:40,089 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:24:40,089 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:24:40,090 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:40" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:24:40,145 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:24:40,145 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:24:40,145 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:24:40,145 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:24:40,145 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2021-05-06 11:24:40,145 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:24:40,145 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:24:40,145 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:24:40,145 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:24:40,146 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:24:40,146 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:24:40,146 INFO L130 BoogieDeclarations]: Found specification of procedure f [2021-05-06 11:24:40,146 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:24:40,146 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:24:40,146 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:24:40,146 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:24:40,146 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:24:40,146 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:24:40,146 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:24:40,329 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:24:40,329 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 11:24:40,330 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:24:40 BoogieIcfgContainer [2021-05-06 11:24:40,330 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:24:40,331 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:24:40,331 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:24:40,333 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:24:40,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:24:39" (1/3) ... [2021-05-06 11:24:40,334 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67ea8b56 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:24:40, skipping insertion in model container [2021-05-06 11:24:40,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:40" (2/3) ... [2021-05-06 11:24:40,334 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67ea8b56 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:24:40, skipping insertion in model container [2021-05-06 11:24:40,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:24:40" (3/3) ... [2021-05-06 11:24:40,335 INFO L111 eAbstractionObserver]: Analyzing ICFG functions_1-2.c [2021-05-06 11:24:40,345 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:24:40,347 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:24:40,360 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:24:40,382 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:24:40,382 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:24:40,382 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:24:40,382 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:24:40,382 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:24:40,382 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:24:40,382 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:24:40,383 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:24:40,397 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 11:24:40,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:24:40,403 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:40,403 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:40,404 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:40,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:40,408 INFO L82 PathProgramCache]: Analyzing trace with hash -1649640916, now seen corresponding path program 1 times [2021-05-06 11:24:40,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:40,414 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1019265728] [2021-05-06 11:24:40,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:40,459 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:40,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:40,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:40,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:40,626 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:40,627 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:40,628 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1019265728] [2021-05-06 11:24:40,629 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1019265728] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:40,629 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:40,629 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:24:40,629 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956330279] [2021-05-06 11:24:40,632 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:24:40,632 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:40,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:24:40,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:24:40,642 INFO L87 Difference]: Start difference. First operand has 23 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:40,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:40,686 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2021-05-06 11:24:40,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:24:40,687 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 11:24:40,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:40,691 INFO L225 Difference]: With dead ends: 34 [2021-05-06 11:24:40,691 INFO L226 Difference]: Without dead ends: 17 [2021-05-06 11:24:40,693 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 56.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:24:40,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-06 11:24:40,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-06 11:24:40,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:24:40,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2021-05-06 11:24:40,728 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 11 [2021-05-06 11:24:40,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:40,728 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2021-05-06 11:24:40,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:40,728 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2021-05-06 11:24:40,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:24:40,729 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:40,729 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:40,729 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:24:40,729 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:40,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:40,734 INFO L82 PathProgramCache]: Analyzing trace with hash -1655182042, now seen corresponding path program 1 times [2021-05-06 11:24:40,734 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:40,734 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1647209032] [2021-05-06 11:24:40,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:40,741 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:40,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:40,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:40,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:40,862 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:40,863 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:40,863 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1647209032] [2021-05-06 11:24:40,863 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1647209032] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:40,864 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:40,864 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:24:40,864 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146139797] [2021-05-06 11:24:40,865 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:24:40,865 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:40,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:24:40,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:24:40,866 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:40,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:40,944 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2021-05-06 11:24:40,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:24:40,945 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 11:24:40,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:40,947 INFO L225 Difference]: With dead ends: 25 [2021-05-06 11:24:40,947 INFO L226 Difference]: Without dead ends: 20 [2021-05-06 11:24:40,948 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 48.9ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:24:40,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-06 11:24:40,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2021-05-06 11:24:40,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:24:40,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2021-05-06 11:24:40,961 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 11 [2021-05-06 11:24:40,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:40,961 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2021-05-06 11:24:40,961 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:40,962 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2021-05-06 11:24:40,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 11:24:40,962 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:40,962 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:40,962 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:24:40,963 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:40,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:40,963 INFO L82 PathProgramCache]: Analyzing trace with hash 1503524740, now seen corresponding path program 1 times [2021-05-06 11:24:40,964 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:40,964 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [70228129] [2021-05-06 11:24:40,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:41,009 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.5 percent of original size [2021-05-06 11:24:41,014 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:41,107 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:24:41,139 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.5 percent of original size 52 [2021-05-06 11:24:41,170 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:41,173 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:24:41,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-06 11:24:41,215 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-06 11:24:41,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-06 11:24:41,239 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-06 11:24:41,251 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-05-06 11:24:41,251 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-06 11:24:41,252 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:24:41,265 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 11:24:41 BoogieIcfgContainer [2021-05-06 11:24:41,265 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 11:24:41,266 INFO L168 Benchmark]: Toolchain (without parser) took 1411.75 ms. Allocated memory is still 162.5 MB. Free memory was 128.2 MB in the beginning and 60.5 MB in the end (delta: 67.7 MB). Peak memory consumption was 67.7 MB. Max. memory is 8.0 GB. [2021-05-06 11:24:41,266 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 162.5 MB. Free memory is still 144.5 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 11:24:41,267 INFO L168 Benchmark]: CACSL2BoogieTranslator took 164.96 ms. Allocated memory is still 162.5 MB. Free memory was 127.9 MB in the beginning and 145.4 MB in the end (delta: -17.5 MB). Peak memory consumption was 10.0 MB. Max. memory is 8.0 GB. [2021-05-06 11:24:41,268 INFO L168 Benchmark]: Boogie Preprocessor took 64.85 ms. Allocated memory is still 162.5 MB. Free memory was 145.4 MB in the beginning and 145.9 MB in the end (delta: -428.2 kB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-06 11:24:41,272 INFO L168 Benchmark]: RCFGBuilder took 241.53 ms. Allocated memory is still 162.5 MB. Free memory was 145.9 MB in the beginning and 131.3 MB in the end (delta: 14.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-06 11:24:41,272 INFO L168 Benchmark]: TraceAbstraction took 933.58 ms. Allocated memory is still 162.5 MB. Free memory was 130.8 MB in the beginning and 60.5 MB in the end (delta: 70.3 MB). Peak memory consumption was 70.3 MB. Max. memory is 8.0 GB. [2021-05-06 11:24:41,275 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 162.5 MB. Free memory is still 144.5 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 164.96 ms. Allocated memory is still 162.5 MB. Free memory was 127.9 MB in the beginning and 145.4 MB in the end (delta: -17.5 MB). Peak memory consumption was 10.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 64.85 ms. Allocated memory is still 162.5 MB. Free memory was 145.4 MB in the beginning and 145.9 MB in the end (delta: -428.2 kB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 241.53 ms. Allocated memory is still 162.5 MB. Free memory was 145.9 MB in the beginning and 131.3 MB in the end (delta: 14.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 933.58 ms. Allocated memory is still 162.5 MB. Free memory was 130.8 MB in the beginning and 60.5 MB in the end (delta: 70.3 MB). Peak memory consumption was 70.3 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 7]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L17] unsigned int x = 0; [L19] COND TRUE x < 0x0fffffff [L20] CALL, EXPR f(x) [L13] return z + 2; [L20] RET, EXPR f(x) [L20] x = f(x) [L19] COND FALSE !(x < 0x0fffffff) [L23] CALL __VERIFIER_assert(x % 2) [L6] COND TRUE !(cond) [L7] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 871.9ms, OverallIterations: 3, TraceHistogramMax: 1, EmptinessCheckTime: 11.0ms, AutomataDifference: 143.5ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 9.7ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 34 SDtfs, 24 SDslu, 11 SDs, 0 SdLazy, 20 SolverSat, 9 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 46.1ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 105.0ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=23occurred in iteration=0, InterpolantAutomatonStates: 7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 38.2ms AutomataMinimizationTime, 2 MinimizatonAttempts, 2 StatesRemovedByMinimization, 1 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...