/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/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/nla-digbench/ps2-ll.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-1a84f73 [2021-05-01 08:19:28,553 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-01 08:19:28,556 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-01 08:19:28,608 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-01 08:19:28,631 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-01 08:19:28,633 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-01 08:19:28,634 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-01 08:19:28,636 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-01 08:19:28,639 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-01 08:19:28,640 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-01 08:19:28,642 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-01 08:19:28,648 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-01 08:19:28,651 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-01 08:19:28,652 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-01 08:19:28,653 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-01 08:19:28,656 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-01 08:19:28,662 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-01 08:19:28,701 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-01 08:19:28,702 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-01 08:19:28,703 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-01 08:19:28,708 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-01 08:19:28,723 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-01 08:19:28,724 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-01 08:19:28,727 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-01 08:19:28,727 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-01 08:19:28,727 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-01 08:19:28,728 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-01 08:19:28,728 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-01 08:19:28,728 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-01 08:19:28,728 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-01 08:19:28,728 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-01 08:19:28,729 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-01 08:19:28,729 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-01 08:19:28,730 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-01 08:19:28,730 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-01 08:19:28,730 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-01 08:19:28,730 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-01 08:19:28,730 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-01 08:19:28,730 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-01 08:19:28,731 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-01 08:19:28,731 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-01 08:19:28,731 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-01 08:19:28,731 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-01 08:19:28,731 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-01 08:19:28,732 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-05-01 08:19:29,107 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-01 08:19:29,126 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-01 08:19:29,129 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-01 08:19:29,130 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-01 08:19:29,131 INFO L275 PluginConnector]: CDTParser initialized [2021-05-01 08:19:29,132 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/ps2-ll.c [2021-05-01 08:19:29,221 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cca428974/425347a3008b4da88dd99362c3118a51/FLAGa228cc885 [2021-05-01 08:19:29,687 INFO L306 CDTParser]: Found 1 translation units. [2021-05-01 08:19:29,688 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/ps2-ll.c [2021-05-01 08:19:29,694 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cca428974/425347a3008b4da88dd99362c3118a51/FLAGa228cc885 [2021-05-01 08:19:30,096 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cca428974/425347a3008b4da88dd99362c3118a51 [2021-05-01 08:19:30,099 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-01 08:19:30,101 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-01 08:19:30,107 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-01 08:19:30,107 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-01 08:19:30,111 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-01 08:19:30,112 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.05 08:19:30" (1/1) ... [2021-05-01 08:19:30,114 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5da01f2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:19:30, skipping insertion in model container [2021-05-01 08:19:30,114 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.05 08:19:30" (1/1) ... [2021-05-01 08:19:30,121 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-01 08:19:30,136 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-01 08:19:30,289 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/ps2-ll.c[454,467] [2021-05-01 08:19:30,304 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-01 08:19:30,313 INFO L203 MainTranslator]: Completed pre-run [2021-05-01 08:19:30,328 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/ps2-ll.c[454,467] [2021-05-01 08:19:30,338 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-01 08:19:30,354 INFO L208 MainTranslator]: Completed translation [2021-05-01 08:19:30,355 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:19:30 WrapperNode [2021-05-01 08:19:30,355 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-01 08:19:30,358 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-01 08:19:30,359 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-01 08:19:30,359 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-01 08:19:30,382 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:19:30" (1/1) ... [2021-05-01 08:19:30,382 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:19:30" (1/1) ... [2021-05-01 08:19:30,390 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:19:30" (1/1) ... [2021-05-01 08:19:30,390 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:19:30" (1/1) ... [2021-05-01 08:19:30,440 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:19:30" (1/1) ... [2021-05-01 08:19:30,445 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:19:30" (1/1) ... [2021-05-01 08:19:30,449 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:19:30" (1/1) ... [2021-05-01 08:19:30,451 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-01 08:19:30,452 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-01 08:19:30,452 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-01 08:19:30,452 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-01 08:19:30,453 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:19:30" (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 [2021-05-01 08:19:30,528 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-01 08:19:30,529 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-01 08:19:30,529 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-01 08:19:30,529 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-01 08:19:30,529 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-01 08:19:30,529 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-01 08:19:30,529 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-01 08:19:30,530 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-01 08:19:30,531 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-01 08:19:30,531 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-01 08:19:30,531 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-01 08:19:30,531 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-01 08:19:30,531 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-01 08:19:30,532 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-01 08:19:30,533 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-01 08:19:30,533 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-01 08:19:30,533 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-01 08:19:30,534 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-01 08:19:30,535 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-01 08:19:30,537 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-01 08:19:30,843 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-01 08:19:30,844 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-01 08:19:30,846 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.05 08:19:30 BoogieIcfgContainer [2021-05-01 08:19:30,846 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-01 08:19:30,848 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-01 08:19:30,848 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-01 08:19:30,851 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-01 08:19:30,851 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.05 08:19:30" (1/3) ... [2021-05-01 08:19:30,852 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50ffd202 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.05 08:19:30, skipping insertion in model container [2021-05-01 08:19:30,852 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:19:30" (2/3) ... [2021-05-01 08:19:30,852 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50ffd202 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.05 08:19:30, skipping insertion in model container [2021-05-01 08:19:30,852 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.05 08:19:30" (3/3) ... [2021-05-01 08:19:30,854 INFO L111 eAbstractionObserver]: Analyzing ICFG ps2-ll.c [2021-05-01 08:19:30,875 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-01 08:19:30,879 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-01 08:19:30,914 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-01 08:19:30,973 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-01 08:19:30,974 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-01 08:19:30,974 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-01 08:19:30,974 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-01 08:19:30,974 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-01 08:19:30,974 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-01 08:19:30,974 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-01 08:19:30,974 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-01 08:19:31,005 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-01 08:19:31,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-01 08:19:31,021 INFO L511 BasicCegarLoop]: Found error trace [2021-05-01 08:19:31,022 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-01 08:19:31,023 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-01 08:19:31,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-01 08:19:31,029 INFO L82 PathProgramCache]: Analyzing trace with hash -1469283919, now seen corresponding path program 1 times [2021-05-01 08:19:31,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-01 08:19:31,054 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653949147] [2021-05-01 08:19:31,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-01 08:19:31,148 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-01 08:19:31,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-01 08:19:31,290 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-05-01 08:19:31,292 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-05-01 08:19:31,293 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-05-01 08:19:31,293 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-05-01 08:19:31,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-01 08:19:31,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-01 08:19:31,379 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-05-01 08:19:31,380 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-05-01 08:19:31,381 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-01 08:19:31,383 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-01 08:19:31,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653949147] [2021-05-01 08:19:31,386 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1653949147] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-01 08:19:31,387 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-01 08:19:31,387 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-01 08:19:31,388 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219289579] [2021-05-01 08:19:31,393 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-01 08:19:31,393 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-01 08:19:31,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-01 08:19:31,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-01 08:19:31,408 INFO L87 Difference]: Start difference. First operand has 21 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 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) [2021-05-01 08:19:31,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-01 08:19:31,511 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2021-05-01 08:19:31,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-01 08:19:31,514 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 [2021-05-01 08:19:31,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-01 08:19:31,524 INFO L225 Difference]: With dead ends: 36 [2021-05-01 08:19:31,524 INFO L226 Difference]: Without dead ends: 16 [2021-05-01 08:19:31,530 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 56.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-01 08:19:31,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-05-01 08:19:31,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-05-01 08:19:31,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 10 states have internal predecessors, (11), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-01 08:19:31,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-01 08:19:31,581 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-05-01 08:19:31,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-01 08:19:31,581 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-01 08:19:31,582 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) [2021-05-01 08:19:31,582 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-01 08:19:31,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-01 08:19:31,583 INFO L511 BasicCegarLoop]: Found error trace [2021-05-01 08:19:31,583 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-01 08:19:31,584 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-01 08:19:31,584 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-01 08:19:31,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-01 08:19:31,585 INFO L82 PathProgramCache]: Analyzing trace with hash -1467496459, now seen corresponding path program 1 times [2021-05-01 08:19:31,586 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-01 08:19:31,586 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126101258] [2021-05-01 08:19:31,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-01 08:19:31,592 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-01 08:19:31,604 WARN L167 FreeRefinementEngine]: Strategy FIXED_PREFERENCES was unsuccessful and could not determine trace feasibility [2021-05-01 08:19:31,604 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-05-01 08:19:31,609 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-01 08:19:31,622 WARN L227 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2021-05-01 08:19:31,623 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 01.05 08:19:31 BoogieIcfgContainer [2021-05-01 08:19:31,623 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-01 08:19:31,625 INFO L168 Benchmark]: Toolchain (without parser) took 1523.39 ms. Allocated memory is still 213.9 MB. Free memory was 179.4 MB in the beginning and 153.1 MB in the end (delta: 26.3 MB). Peak memory consumption was 26.2 MB. Max. memory is 8.0 GB. [2021-05-01 08:19:31,625 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 213.9 MB. Free memory is still 196.2 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-01 08:19:31,626 INFO L168 Benchmark]: CACSL2BoogieTranslator took 248.58 ms. Allocated memory is still 213.9 MB. Free memory was 179.2 MB in the beginning and 169.7 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-01 08:19:31,627 INFO L168 Benchmark]: Boogie Preprocessor took 92.49 ms. Allocated memory is still 213.9 MB. Free memory was 169.7 MB in the beginning and 197.9 MB in the end (delta: -28.2 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. [2021-05-01 08:19:31,627 INFO L168 Benchmark]: RCFGBuilder took 393.85 ms. Allocated memory is still 213.9 MB. Free memory was 197.9 MB in the beginning and 184.2 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-05-01 08:19:31,628 INFO L168 Benchmark]: TraceAbstraction took 775.93 ms. Allocated memory is still 213.9 MB. Free memory was 183.9 MB in the beginning and 153.1 MB in the end (delta: 30.7 MB). Peak memory consumption was 30.4 MB. Max. memory is 8.0 GB. [2021-05-01 08:19:31,637 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 213.9 MB. Free memory is still 196.2 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 248.58 ms. Allocated memory is still 213.9 MB. Free memory was 179.2 MB in the beginning and 169.7 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 92.49 ms. Allocated memory is still 213.9 MB. Free memory was 169.7 MB in the beginning and 197.9 MB in the end (delta: -28.2 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 393.85 ms. Allocated memory is still 213.9 MB. Free memory was 197.9 MB in the beginning and 184.2 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 775.93 ms. Allocated memory is still 213.9 MB. Free memory was 183.9 MB in the beginning and 153.1 MB in the end (delta: 30.7 MB). Peak memory consumption was 30.4 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 12]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L18] int k; [L19] long long y, x, c; [L20] k = __VERIFIER_nondet_int() [L22] y = 0 [L23] x = 0 [L24] c = 0 [L26] COND TRUE 1 [L27] CALL __VERIFIER_assert((y * y) - 2 * x + y == 0) [L10] COND TRUE !(cond) [L12] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNKNOWN, OverallTime: 639.7ms, OverallIterations: 2, TraceHistogramMax: 1, EmptinessCheckTime: 37.9ms, AutomataDifference: 133.4ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 9.2ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 19 SDtfs, 11 SDslu, 3 SDs, 0 SdLazy, 5 SolverSat, 3 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 33.4ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 56.5ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=0, InterpolantAutomatonStates: 3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 36.1ms AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 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 could not prove your program: unable to determine feasibility of some traces Received shutdown request...