/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/nla-digbench-scaling/sqrt1-ll_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 12:34:24,615 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 12:34:24,618 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 12:34:24,656 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 12:34:24,677 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 12:34:24,679 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 12:34:24,680 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 12:34:24,681 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 12:34:24,684 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 12:34:24,684 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 12:34:24,686 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 12:34:24,691 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 12:34:24,695 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 12:34:24,696 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 12:34:24,697 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 12:34:24,699 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 12:34:24,705 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 12:34:24,721 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 12:34:24,722 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 12:34:24,723 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 12:34:24,726 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 12:34:24,741 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 12:34:24,741 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 12:34:24,744 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 12:34:24,744 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 12:34:24,745 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 12:34:24,745 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 12:34:24,745 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 12:34:24,745 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 12:34:24,745 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 12:34:24,745 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 12:34:24,746 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 12:34:24,746 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 12:34:24,746 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 12:34:24,747 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 12:34:24,747 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 12:34:24,747 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 12:34:24,747 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 12:34:24,747 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 12:34:24,748 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 12:34:24,748 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 12:34:24,748 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 12:34:24,748 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 12:34:24,748 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 12:34:24,748 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 12:34:25,055 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 12:34:25,071 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 12:34:25,073 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 12:34:25,074 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 12:34:25,075 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 12:34:25,075 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound20.c [2021-05-06 12:34:25,136 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47f0e8dc6/c52aaab9f2364125b6ea218182157bc7/FLAG67a405a21 [2021-05-06 12:34:25,512 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 12:34:25,512 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound20.c [2021-05-06 12:34:25,518 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47f0e8dc6/c52aaab9f2364125b6ea218182157bc7/FLAG67a405a21 [2021-05-06 12:34:25,540 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47f0e8dc6/c52aaab9f2364125b6ea218182157bc7 [2021-05-06 12:34:25,542 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 12:34:25,544 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 12:34:25,549 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 12:34:25,549 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 12:34:25,552 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 12:34:25,553 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:34:25" (1/1) ... [2021-05-06 12:34:25,554 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7fd25d70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:25, skipping insertion in model container [2021-05-06 12:34:25,554 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:34:25" (1/1) ... [2021-05-06 12:34:25,560 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 12:34:25,574 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 12:34:25,695 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-scaling/sqrt1-ll_unwindbound20.c[520,533] [2021-05-06 12:34:25,706 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:34:25,713 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 12:34:25,723 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-scaling/sqrt1-ll_unwindbound20.c[520,533] [2021-05-06 12:34:25,729 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:34:25,788 INFO L208 MainTranslator]: Completed translation [2021-05-06 12:34:25,788 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:25 WrapperNode [2021-05-06 12:34:25,788 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 12:34:25,789 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 12:34:25,789 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 12:34:25,789 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 12:34:25,806 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:25" (1/1) ... [2021-05-06 12:34:25,806 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:25" (1/1) ... [2021-05-06 12:34:25,813 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:25" (1/1) ... [2021-05-06 12:34:25,814 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:25" (1/1) ... [2021-05-06 12:34:25,826 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:25" (1/1) ... [2021-05-06 12:34:25,830 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:25" (1/1) ... [2021-05-06 12:34:25,832 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:25" (1/1) ... [2021-05-06 12:34:25,838 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 12:34:25,839 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 12:34:25,839 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 12:34:25,839 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 12:34:25,840 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:25" (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 12:34:25,906 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 12:34:25,906 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 12:34:25,906 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 12:34:25,907 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 12:34:25,907 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 12:34:25,907 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 12:34:25,907 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 12:34:25,907 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 12:34:25,908 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 12:34:25,908 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 12:34:25,908 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 12:34:25,908 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 12:34:25,908 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 12:34:25,908 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 12:34:25,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 12:34:25,909 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 12:34:25,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 12:34:25,909 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 12:34:25,910 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 12:34:25,910 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 12:34:26,196 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 12:34:26,197 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 12:34:26,198 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:34:26 BoogieIcfgContainer [2021-05-06 12:34:26,198 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 12:34:26,199 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 12:34:26,199 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 12:34:26,201 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 12:34:26,202 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 12:34:25" (1/3) ... [2021-05-06 12:34:26,202 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4deaf559 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:34:26, skipping insertion in model container [2021-05-06 12:34:26,202 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:34:25" (2/3) ... [2021-05-06 12:34:26,203 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4deaf559 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:34:26, skipping insertion in model container [2021-05-06 12:34:26,203 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:34:26" (3/3) ... [2021-05-06 12:34:26,204 INFO L111 eAbstractionObserver]: Analyzing ICFG sqrt1-ll_unwindbound20.c [2021-05-06 12:34:26,208 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 12:34:26,211 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 12:34:26,225 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 12:34:26,241 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 12:34:26,241 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 12:34:26,241 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 12:34:26,241 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 12:34:26,241 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 12:34:26,241 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 12:34:26,242 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 12:34:26,242 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 12:34:26,269 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 12:34:26,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 12:34:26,275 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:34:26,276 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:34:26,276 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:34:26,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:34:26,281 INFO L82 PathProgramCache]: Analyzing trace with hash -643130361, now seen corresponding path program 1 times [2021-05-06 12:34:26,292 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:34:26,292 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1324833263] [2021-05-06 12:34:26,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:34:26,337 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:34:26,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:26,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:34:26,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:26,456 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 12:34:26,458 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:34:26,458 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1324833263] [2021-05-06 12:34:26,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1324833263] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:34:26,459 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:34:26,460 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 12:34:26,460 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961976948] [2021-05-06 12:34:26,463 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 12:34:26,463 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:34:26,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 12:34:26,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 12:34:26,475 INFO L87 Difference]: Start difference. First operand has 26 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) 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 12:34:26,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:34:26,561 INFO L93 Difference]: Finished difference Result 47 states and 70 transitions. [2021-05-06 12:34:26,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 12:34:26,562 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 12:34:26,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:34:26,569 INFO L225 Difference]: With dead ends: 47 [2021-05-06 12:34:26,569 INFO L226 Difference]: Without dead ends: 22 [2021-05-06 12:34:26,572 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 32.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 12:34:26,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-06 12:34:26,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-06 12:34:26,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 12:34:26,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2021-05-06 12:34:26,606 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 11 [2021-05-06 12:34:26,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:34:26,607 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2021-05-06 12:34:26,607 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 12:34:26,607 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2021-05-06 12:34:26,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 12:34:26,608 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:34:26,608 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:34:26,609 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 12:34:26,609 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:34:26,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:34:26,610 INFO L82 PathProgramCache]: Analyzing trace with hash 1070997212, now seen corresponding path program 1 times [2021-05-06 12:34:26,610 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:34:26,610 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1324594181] [2021-05-06 12:34:26,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:34:26,613 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:34:26,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:26,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:34:26,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:26,730 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 12:34:26,730 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:34:26,731 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1324594181] [2021-05-06 12:34:26,731 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1324594181] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:34:26,731 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:34:26,731 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 12:34:26,731 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906061393] [2021-05-06 12:34:26,732 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 12:34:26,732 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:34:26,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 12:34:26,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 12:34:26,733 INFO L87 Difference]: Start difference. First operand 21 states and 27 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 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 12:34:26,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:34:26,837 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-05-06 12:34:26,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 12:34:26,838 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 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 12 [2021-05-06 12:34:26,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:34:26,839 INFO L225 Difference]: With dead ends: 32 [2021-05-06 12:34:26,839 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 12:34:26,840 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 71.8ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 12:34:26,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 12:34:26,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-06 12:34:26,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 12:34:26,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 29 transitions. [2021-05-06 12:34:26,848 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 29 transitions. Word has length 12 [2021-05-06 12:34:26,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:34:26,848 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 29 transitions. [2021-05-06 12:34:26,848 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 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 12:34:26,849 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 29 transitions. [2021-05-06 12:34:26,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 12:34:26,849 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:34:26,849 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:34:26,849 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 12:34:26,849 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:34:26,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:34:26,850 INFO L82 PathProgramCache]: Analyzing trace with hash 1072665508, now seen corresponding path program 1 times [2021-05-06 12:34:26,850 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:34:26,850 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48050130] [2021-05-06 12:34:26,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:34:26,852 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:34:26,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:26,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:34:26,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:34:26,973 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 12:34:26,974 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:34:26,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48050130] [2021-05-06 12:34:26,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [48050130] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:34:26,974 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:34:26,974 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 12:34:26,975 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053741939] [2021-05-06 12:34:26,975 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 12:34:26,975 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:34:26,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 12:34:26,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 12:34:26,976 INFO L87 Difference]: Start difference. First operand 23 states and 29 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 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 12:34:27,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:34:27,263 INFO L93 Difference]: Finished difference Result 36 states and 47 transitions. [2021-05-06 12:34:27,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 12:34:27,264 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 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 12 [2021-05-06 12:34:27,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:34:27,266 INFO L225 Difference]: With dead ends: 36 [2021-05-06 12:34:27,267 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 12:34:27,267 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 183.2ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 12:34:27,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 12:34:27,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2021-05-06 12:34:27,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 16 states have (on average 1.25) internal successors, (20), 18 states have internal predecessors, (20), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 12:34:27,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-06 12:34:27,291 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 12 [2021-05-06 12:34:27,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:34:27,292 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-06 12:34:27,293 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 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 12:34:27,293 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-06 12:34:27,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 12:34:27,294 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:34:27,294 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:34:27,294 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 12:34:27,294 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:34:27,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:34:27,295 INFO L82 PathProgramCache]: Analyzing trace with hash 1640566567, now seen corresponding path program 1 times [2021-05-06 12:34:27,295 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:34:27,295 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [126370329] [2021-05-06 12:34:27,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:34:27,307 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:34:27,327 WARN L167 FreeRefinementEngine]: Strategy FIXED_PREFERENCES was unsuccessful and could not determine trace feasibility [2021-05-06 12:34:27,327 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-06 12:34:27,330 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 12:34:27,343 WARN L227 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2021-05-06 12:34:27,344 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 12:34:27 BoogieIcfgContainer [2021-05-06 12:34:27,344 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 12:34:27,345 INFO L168 Benchmark]: Toolchain (without parser) took 1801.09 ms. Allocated memory is still 196.1 MB. Free memory was 161.1 MB in the beginning and 96.7 MB in the end (delta: 64.4 MB). Peak memory consumption was 65.1 MB. Max. memory is 8.0 GB. [2021-05-06 12:34:27,345 INFO L168 Benchmark]: CDTParser took 0.14 ms. Allocated memory is still 196.1 MB. Free memory is still 178.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 12:34:27,346 INFO L168 Benchmark]: CACSL2BoogieTranslator took 239.94 ms. Allocated memory is still 196.1 MB. Free memory was 160.9 MB in the beginning and 180.1 MB in the end (delta: -19.2 MB). Peak memory consumption was 14.0 MB. Max. memory is 8.0 GB. [2021-05-06 12:34:27,346 INFO L168 Benchmark]: Boogie Preprocessor took 49.06 ms. Allocated memory is still 196.1 MB. Free memory was 180.1 MB in the beginning and 178.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-06 12:34:27,347 INFO L168 Benchmark]: RCFGBuilder took 358.89 ms. Allocated memory is still 196.1 MB. Free memory was 178.8 MB in the beginning and 164.1 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-06 12:34:27,347 INFO L168 Benchmark]: TraceAbstraction took 1144.97 ms. Allocated memory is still 196.1 MB. Free memory was 163.6 MB in the beginning and 96.7 MB in the end (delta: 66.8 MB). Peak memory consumption was 66.8 MB. Max. memory is 8.0 GB. [2021-05-06 12:34:27,349 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 ms. Allocated memory is still 196.1 MB. Free memory is still 178.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 239.94 ms. Allocated memory is still 196.1 MB. Free memory was 160.9 MB in the beginning and 180.1 MB in the end (delta: -19.2 MB). Peak memory consumption was 14.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 49.06 ms. Allocated memory is still 196.1 MB. Free memory was 180.1 MB in the beginning and 178.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 358.89 ms. Allocated memory is still 196.1 MB. Free memory was 178.8 MB in the beginning and 164.1 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1144.97 ms. Allocated memory is still 196.1 MB. Free memory was 163.6 MB in the beginning and 96.7 MB in the end (delta: 66.8 MB). Peak memory consumption was 66.8 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 14]: 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: [L20] int counter = 0; [L22] int n; [L23] long long a, s, t; [L24] n = __VERIFIER_nondet_int() [L26] a = 0 [L27] s = 1 [L28] t = 1 [L30] EXPR counter++ [L30] COND TRUE counter++<20 [L31] CALL __VERIFIER_assert(t == 2*a + 1) [L12] COND FALSE !(!(cond)) [L31] RET __VERIFIER_assert(t == 2*a + 1) [L32] CALL __VERIFIER_assert(s == (a + 1) * (a + 1)) [L12] COND TRUE !(cond) [L14] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNKNOWN, OverallTime: 1092.3ms, OverallIterations: 4, TraceHistogramMax: 2, EmptinessCheckTime: 27.9ms, AutomataDifference: 508.3ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 8.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 79 SDtfs, 28 SDslu, 89 SDs, 0 SdLazy, 109 SolverSat, 29 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 207.8ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 22 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 288.0ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=32occurred in iteration=3, InterpolantAutomatonStates: 17, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 53.0ms AutomataMinimizationTime, 3 MinimizatonAttempts, 3 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...