/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/acceleratedInterpolationWernerOverapprox_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-b7b32d2 [2021-02-22 02:21:44,848 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-22 02:21:44,851 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-22 02:21:44,888 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-22 02:21:44,900 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-22 02:21:44,902 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-22 02:21:44,903 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-22 02:21:44,904 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-22 02:21:44,905 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-22 02:21:44,906 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-22 02:21:44,917 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-22 02:21:44,922 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-22 02:21:44,924 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-22 02:21:44,925 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-22 02:21:44,926 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-22 02:21:44,927 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-22 02:21:44,930 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-02-22 02:21:44,939 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-22 02:21:44,940 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-22 02:21:44,941 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-22 02:21:44,941 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationWernerOverapprox_32.epf [2021-02-22 02:21:44,953 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-22 02:21:44,954 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-22 02:21:44,955 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-22 02:21:44,956 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-22 02:21:44,956 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-22 02:21:44,956 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-22 02:21:44,956 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-22 02:21:44,957 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-22 02:21:44,957 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-22 02:21:44,957 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-22 02:21:44,957 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-22 02:21:44,958 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-22 02:21:44,958 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-22 02:21:44,958 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-22 02:21:44,958 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-22 02:21:44,959 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-22 02:21:44,959 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-22 02:21:44,959 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-22 02:21:44,959 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-22 02:21:44,959 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-22 02:21:44,960 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-22 02:21:44,960 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-22 02:21:44,960 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=WERNER_OVERAPPROX [2021-02-22 02:21:44,960 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-22 02:21:45,310 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-22 02:21:45,333 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-22 02:21:45,336 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-22 02:21:45,337 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-22 02:21:45,339 INFO L275 PluginConnector]: CDTParser initialized [2021-02-22 02:21:45,341 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2021-02-22 02:21:45,412 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/67cc7b660/80e773d0467e427ca73e25f9951779be/FLAG8c4b0cb87 [2021-02-22 02:21:45,946 INFO L306 CDTParser]: Found 1 translation units. [2021-02-22 02:21:45,947 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2021-02-22 02:21:45,954 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/67cc7b660/80e773d0467e427ca73e25f9951779be/FLAG8c4b0cb87 [2021-02-22 02:21:46,316 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/67cc7b660/80e773d0467e427ca73e25f9951779be [2021-02-22 02:21:46,327 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-22 02:21:46,343 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-22 02:21:46,348 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-22 02:21:46,348 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-22 02:21:46,355 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-22 02:21:46,356 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.02 02:21:46" (1/1) ... [2021-02-22 02:21:46,358 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ee4e583 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:21:46, skipping insertion in model container [2021-02-22 02:21:46,358 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.02 02:21:46" (1/1) ... [2021-02-22 02:21:46,369 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-22 02:21:46,386 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-22 02:21:46,580 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c[327,340] [2021-02-22 02:21:46,592 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-22 02:21:46,601 INFO L203 MainTranslator]: Completed pre-run [2021-02-22 02:21:46,615 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c[327,340] [2021-02-22 02:21:46,617 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-22 02:21:46,633 INFO L208 MainTranslator]: Completed translation [2021-02-22 02:21:46,633 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:21:46 WrapperNode [2021-02-22 02:21:46,634 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-22 02:21:46,635 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-22 02:21:46,635 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-22 02:21:46,635 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-22 02:21:46,647 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:21:46" (1/1) ... [2021-02-22 02:21:46,647 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:21:46" (1/1) ... [2021-02-22 02:21:46,655 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:21:46" (1/1) ... [2021-02-22 02:21:46,655 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:21:46" (1/1) ... [2021-02-22 02:21:46,661 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:21:46" (1/1) ... [2021-02-22 02:21:46,665 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:21:46" (1/1) ... [2021-02-22 02:21:46,666 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:21:46" (1/1) ... [2021-02-22 02:21:46,668 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-22 02:21:46,669 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-22 02:21:46,669 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-22 02:21:46,669 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-22 02:21:46,670 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:21:46" (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 [2021-02-22 02:21:46,778 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-22 02:21:46,779 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-22 02:21:46,779 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-22 02:21:46,779 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-02-22 02:21:46,780 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-22 02:21:46,780 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-22 02:21:46,781 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-22 02:21:46,781 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-22 02:21:46,781 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-22 02:21:46,782 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-02-22 02:21:46,782 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-22 02:21:46,783 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-22 02:21:46,783 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-22 02:21:46,783 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-22 02:21:46,784 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-22 02:21:46,784 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-22 02:21:46,784 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-22 02:21:47,149 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-22 02:21:47,149 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-02-22 02:21:47,152 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.02 02:21:47 BoogieIcfgContainer [2021-02-22 02:21:47,153 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-22 02:21:47,167 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-22 02:21:47,168 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-22 02:21:47,174 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-22 02:21:47,174 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.02 02:21:46" (1/3) ... [2021-02-22 02:21:47,175 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58eda74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.02 02:21:47, skipping insertion in model container [2021-02-22 02:21:47,176 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:21:46" (2/3) ... [2021-02-22 02:21:47,179 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58eda74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.02 02:21:47, skipping insertion in model container [2021-02-22 02:21:47,179 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.02 02:21:47" (3/3) ... [2021-02-22 02:21:47,181 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2021-02-22 02:21:47,197 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-22 02:21:47,201 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-22 02:21:47,220 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-22 02:21:47,241 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-22 02:21:47,241 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-22 02:21:47,241 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-02-22 02:21:47,241 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-22 02:21:47,242 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-22 02:21:47,242 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-22 02:21:47,242 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-22 02:21:47,242 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-22 02:21:47,257 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states. [2021-02-22 02:21:47,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-02-22 02:21:47,266 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 02:21:47,267 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-22 02:21:47,267 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 02:21:47,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 02:21:47,274 INFO L82 PathProgramCache]: Analyzing trace with hash 645207053, now seen corresponding path program 1 times [2021-02-22 02:21:47,283 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 02:21:47,284 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698499491] [2021-02-22 02:21:47,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 02:21:47,364 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-22 02:21:47,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 02:21:47,607 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:21:47,609 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:21:47,612 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:21:47,612 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 02:21:47,625 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:21:47,628 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:21:47,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-22 02:21:47,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 02:21:47,744 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:21:47,745 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:21:47,749 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-22 02:21:47,751 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698499491] [2021-02-22 02:21:47,753 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-22 02:21:47,753 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-02-22 02:21:47,754 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887675489] [2021-02-22 02:21:47,759 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-02-22 02:21:47,759 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-22 02:21:47,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-02-22 02:21:47,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-02-22 02:21:47,776 INFO L87 Difference]: Start difference. First operand 31 states. Second operand 4 states. [2021-02-22 02:21:47,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-22 02:21:47,923 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2021-02-22 02:21:47,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-02-22 02:21:47,926 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2021-02-22 02:21:47,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-22 02:21:47,933 INFO L225 Difference]: With dead ends: 45 [2021-02-22 02:21:47,934 INFO L226 Difference]: Without dead ends: 27 [2021-02-22 02:21:47,937 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-02-22 02:21:47,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-02-22 02:21:47,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2021-02-22 02:21:47,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2021-02-22 02:21:47,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2021-02-22 02:21:47,986 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 19 [2021-02-22 02:21:47,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-22 02:21:47,987 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2021-02-22 02:21:47,987 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2021-02-22 02:21:47,987 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2021-02-22 02:21:47,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-22 02:21:47,988 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 02:21:47,988 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] [2021-02-22 02:21:47,989 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-22 02:21:47,989 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 02:21:47,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 02:21:47,990 INFO L82 PathProgramCache]: Analyzing trace with hash -567626551, now seen corresponding path program 1 times [2021-02-22 02:21:47,990 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 02:21:47,991 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1266804989] [2021-02-22 02:21:47,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 02:21:48,115 WARN L202 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2021-02-22 02:21:48,135 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:21:48,150 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-02-22 02:21:48,156 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:21:48,160 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-02-22 02:21:48,174 WARN L141 QuantifierPusher]: treesize reduction 6, result has 76.0 percent of original size [2021-02-22 02:21:48,189 INFO L723 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2021-02-22 02:21:48,194 INFO L730 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:21:48,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-02-22 02:21:48,197 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:21:48,204 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 27 [2021-02-22 02:21:48,207 WARN L147 QuantifierPusher]: treesize reduction 6, result has 76.0 percent of original size 19 [2021-02-22 02:21:48,212 WARN L141 QuantifierPusher]: treesize reduction 5, result has 85.7 percent of original size [2021-02-22 02:21:48,215 WARN L147 QuantifierPusher]: treesize reduction 5, result has 85.7 percent of original size 30 [2021-02-22 02:21:48,217 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:21:48,220 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-02-22 02:21:48,222 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:21:48,225 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-02-22 02:21:48,232 WARN L141 QuantifierPusher]: treesize reduction 8, result has 72.4 percent of original size [2021-02-22 02:21:48,235 INFO L723 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2021-02-22 02:21:48,237 INFO L730 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:21:48,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-02-22 02:21:48,240 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:21:48,244 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-02-22 02:21:48,246 WARN L147 QuantifierPusher]: treesize reduction 8, result has 72.4 percent of original size 21 [2021-02-22 02:21:48,249 WARN L141 QuantifierPusher]: treesize reduction 5, result has 86.8 percent of original size [2021-02-22 02:21:48,252 WARN L147 QuantifierPusher]: treesize reduction 5, result has 86.8 percent of original size 33 [2021-02-22 02:21:48,254 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:21:48,257 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-02-22 02:21:48,258 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:21:48,261 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-02-22 02:21:48,268 WARN L141 QuantifierPusher]: treesize reduction 6, result has 76.0 percent of original size [2021-02-22 02:21:48,270 INFO L723 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2021-02-22 02:21:48,273 INFO L730 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:21:48,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-02-22 02:21:48,275 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:21:48,279 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 27 [2021-02-22 02:21:48,280 WARN L147 QuantifierPusher]: treesize reduction 6, result has 76.0 percent of original size 19 [2021-02-22 02:21:48,284 WARN L141 QuantifierPusher]: treesize reduction 5, result has 85.7 percent of original size [2021-02-22 02:21:48,286 WARN L147 QuantifierPusher]: treesize reduction 5, result has 85.7 percent of original size 30 [2021-02-22 02:21:48,287 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-02-22 02:21:48,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-22 02:21:48,326 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-22 02:21:48,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-22 02:21:48,374 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-22 02:21:48,411 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-02-22 02:21:48,411 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-22 02:21:48,415 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-02-22 02:21:48,430 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.02 02:21:48 BoogieIcfgContainer [2021-02-22 02:21:48,430 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-22 02:21:48,432 INFO L168 Benchmark]: Toolchain (without parser) took 2101.03 ms. Allocated memory is still 157.3 MB. Free memory was 133.8 MB in the beginning and 79.9 MB in the end (delta: 53.9 MB). Peak memory consumption was 55.3 MB. Max. memory is 8.0 GB. [2021-02-22 02:21:48,433 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 157.3 MB. Free memory was 131.1 MB in the beginning and 130.8 MB in the end (delta: 215.0 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-02-22 02:21:48,433 INFO L168 Benchmark]: CACSL2BoogieTranslator took 286.07 ms. Allocated memory is still 157.3 MB. Free memory was 132.6 MB in the beginning and 123.3 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-02-22 02:21:48,434 INFO L168 Benchmark]: Boogie Preprocessor took 33.48 ms. Allocated memory is still 157.3 MB. Free memory was 123.3 MB in the beginning and 121.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-02-22 02:21:48,435 INFO L168 Benchmark]: RCFGBuilder took 483.56 ms. Allocated memory is still 157.3 MB. Free memory was 121.9 MB in the beginning and 108.6 MB in the end (delta: 13.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2021-02-22 02:21:48,436 INFO L168 Benchmark]: TraceAbstraction took 1263.07 ms. Allocated memory is still 157.3 MB. Free memory was 108.2 MB in the beginning and 79.9 MB in the end (delta: 28.3 MB). Peak memory consumption was 29.1 MB. Max. memory is 8.0 GB. [2021-02-22 02:21:48,439 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 157.3 MB. Free memory was 131.1 MB in the beginning and 130.8 MB in the end (delta: 215.0 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 286.07 ms. Allocated memory is still 157.3 MB. Free memory was 132.6 MB in the beginning and 123.3 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 33.48 ms. Allocated memory is still 157.3 MB. Free memory was 123.3 MB in the beginning and 121.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 483.56 ms. Allocated memory is still 157.3 MB. Free memory was 121.9 MB in the beginning and 108.6 MB in the end (delta: 13.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1263.07 ms. Allocated memory is still 157.3 MB. Free memory was 108.2 MB in the beginning and 79.9 MB in the end (delta: 28.3 MB). Peak memory consumption was 29.1 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: [L13] unsigned int x = 0; [L14] unsigned int y = 1; [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND FALSE !(x < 6) [L21] CALL __VERIFIER_assert(y != 64) [L6] COND TRUE !(cond) [L7] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 34 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.1s, OverallIterations: 2, TraceHistogramMax: 1, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 27 SDtfs, 19 SDslu, 19 SDs, 0 SdLazy, 24 SolverSat, 2 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=31occurred 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, 1 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...