/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-scaling/sqrt1-ll_unwindbound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-1a84f73 [2021-05-01 08:25:35,369 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-01 08:25:35,370 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-01 08:25:35,396 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-01 08:25:35,396 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-01 08:25:35,399 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-01 08:25:35,401 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-01 08:25:35,408 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-01 08:25:35,410 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-01 08:25:35,414 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-01 08:25:35,415 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-01 08:25:35,416 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-01 08:25:35,416 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-01 08:25:35,417 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-01 08:25:35,418 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-01 08:25:35,419 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-01 08:25:35,422 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-01 08:25:35,422 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-01 08:25:35,424 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-01 08:25:35,429 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-01 08:25:35,465 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-01 08:25:35,467 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-01 08:25:35,470 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-01 08:25:35,473 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-01 08:25:35,479 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-01 08:25:35,479 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-01 08:25:35,479 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-01 08:25:35,485 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-01 08:25:35,485 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-01 08:25:35,486 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-01 08:25:35,486 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-01 08:25:35,487 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-01 08:25:35,487 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-01 08:25:35,488 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-01 08:25:35,489 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-01 08:25:35,489 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-01 08:25:35,490 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-01 08:25:35,490 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-01 08:25:35,490 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-01 08:25:35,491 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-01 08:25:35,491 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-01 08:25:35,495 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 08:25:35,511 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-01 08:25:35,512 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-01 08:25:35,514 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-01 08:25:35,514 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-01 08:25:35,515 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-01 08:25:35,515 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-01 08:25:35,515 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-01 08:25:35,515 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-01 08:25:35,515 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-01 08:25:35,515 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-01 08:25:35,516 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-01 08:25:35,516 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-01 08:25:35,516 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-01 08:25:35,516 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-01 08:25:35,516 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-01 08:25:35,516 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-01 08:25:35,517 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-01 08:25:35,517 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-01 08:25:35,517 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-01 08:25:35,517 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-01 08:25:35,517 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-01 08:25:35,517 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-01 08:25:35,517 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-01 08:25:35,517 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-05-01 08:25:35,764 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-01 08:25:35,780 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-01 08:25:35,782 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-01 08:25:35,782 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-01 08:25:35,783 INFO L275 PluginConnector]: CDTParser initialized [2021-05-01 08:25:35,783 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound50.c [2021-05-01 08:25:35,836 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bc0899ccd/207a15d23010468bb27d40a519146082/FLAG42ec11f95 [2021-05-01 08:25:36,249 INFO L306 CDTParser]: Found 1 translation units. [2021-05-01 08:25:36,250 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound50.c [2021-05-01 08:25:36,255 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bc0899ccd/207a15d23010468bb27d40a519146082/FLAG42ec11f95 [2021-05-01 08:25:36,273 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bc0899ccd/207a15d23010468bb27d40a519146082 [2021-05-01 08:25:36,275 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-01 08:25:36,277 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-01 08:25:36,281 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-01 08:25:36,282 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-01 08:25:36,286 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-01 08:25:36,287 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.05 08:25:36" (1/1) ... [2021-05-01 08:25:36,288 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3f824dac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:25:36, skipping insertion in model container [2021-05-01 08:25:36,288 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.05 08:25:36" (1/1) ... [2021-05-01 08:25:36,295 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-01 08:25:36,309 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-01 08:25:36,447 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_unwindbound50.c[520,533] [2021-05-01 08:25:36,462 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-01 08:25:36,469 INFO L203 MainTranslator]: Completed pre-run [2021-05-01 08:25:36,484 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_unwindbound50.c[520,533] [2021-05-01 08:25:36,500 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-01 08:25:36,512 INFO L208 MainTranslator]: Completed translation [2021-05-01 08:25:36,513 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:25:36 WrapperNode [2021-05-01 08:25:36,513 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-01 08:25:36,515 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-01 08:25:36,515 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-01 08:25:36,516 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-01 08:25:36,566 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:25:36" (1/1) ... [2021-05-01 08:25:36,566 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:25:36" (1/1) ... [2021-05-01 08:25:36,572 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:25:36" (1/1) ... [2021-05-01 08:25:36,572 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:25:36" (1/1) ... [2021-05-01 08:25:36,582 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:25:36" (1/1) ... [2021-05-01 08:25:36,585 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:25:36" (1/1) ... [2021-05-01 08:25:36,589 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:25:36" (1/1) ... [2021-05-01 08:25:36,593 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-01 08:25:36,594 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-01 08:25:36,595 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-01 08:25:36,595 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-01 08:25:36,596 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:25:36" (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 08:25:36,674 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-01 08:25:36,675 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-01 08:25:36,675 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-01 08:25:36,675 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-01 08:25:36,675 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-01 08:25:36,675 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-01 08:25:36,676 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-01 08:25:36,676 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-01 08:25:36,676 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-01 08:25:36,676 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-01 08:25:36,676 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-01 08:25:36,676 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-01 08:25:36,676 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-01 08:25:36,677 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-01 08:25:36,677 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-01 08:25:36,677 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-01 08:25:36,677 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-01 08:25:36,678 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-01 08:25:36,678 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-01 08:25:36,678 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-01 08:25:36,903 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-01 08:25:36,904 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-01 08:25:36,905 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.05 08:25:36 BoogieIcfgContainer [2021-05-01 08:25:36,905 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-01 08:25:36,906 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-01 08:25:36,906 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-01 08:25:36,908 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-01 08:25:36,908 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.05 08:25:36" (1/3) ... [2021-05-01 08:25:36,909 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11beb9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.05 08:25:36, skipping insertion in model container [2021-05-01 08:25:36,909 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.05 08:25:36" (2/3) ... [2021-05-01 08:25:36,909 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11beb9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.05 08:25:36, skipping insertion in model container [2021-05-01 08:25:36,909 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.05 08:25:36" (3/3) ... [2021-05-01 08:25:36,910 INFO L111 eAbstractionObserver]: Analyzing ICFG sqrt1-ll_unwindbound50.c [2021-05-01 08:25:36,914 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-01 08:25:36,916 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-01 08:25:36,929 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-01 08:25:36,943 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-01 08:25:36,944 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-01 08:25:36,944 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-01 08:25:36,944 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-01 08:25:36,944 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-01 08:25:36,944 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-01 08:25:36,944 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-01 08:25:36,944 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-01 08:25:36,974 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) [2021-05-01 08:25:36,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-01 08:25:36,979 INFO L511 BasicCegarLoop]: Found error trace [2021-05-01 08:25:36,979 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-01 08:25:36,979 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-01 08:25:36,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-01 08:25:36,983 INFO L82 PathProgramCache]: Analyzing trace with hash -643130361, now seen corresponding path program 1 times [2021-05-01 08:25:36,990 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-01 08:25:36,993 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [866305690] [2021-05-01 08:25:36,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-01 08:25:37,038 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-01 08:25:37,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-01 08:25:37,129 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-05-01 08:25:37,130 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-05-01 08:25:37,131 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-05-01 08:25:37,131 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-05-01 08:25:37,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-01 08:25:37,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-01 08:25:37,195 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-05-01 08:25:37,196 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-05-01 08:25:37,197 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 08:25:37,198 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-01 08:25:37,199 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [866305690] [2021-05-01 08:25:37,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [866305690] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-01 08:25:37,200 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-01 08:25:37,200 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-01 08:25:37,200 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844159880] [2021-05-01 08:25:37,203 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-01 08:25:37,203 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-01 08:25:37,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-01 08:25:37,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-01 08:25:37,222 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) [2021-05-01 08:25:37,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-01 08:25:37,327 INFO L93 Difference]: Finished difference Result 47 states and 70 transitions. [2021-05-01 08:25:37,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-01 08:25:37,329 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 08:25:37,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-01 08:25:37,335 INFO L225 Difference]: With dead ends: 47 [2021-05-01 08:25:37,335 INFO L226 Difference]: Without dead ends: 22 [2021-05-01 08:25:37,338 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 50.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-01 08:25:37,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-01 08:25:37,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-01 08:25:37,370 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) [2021-05-01 08:25:37,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2021-05-01 08:25:37,373 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 11 [2021-05-01 08:25:37,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-01 08:25:37,373 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2021-05-01 08:25:37,373 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 08:25:37,374 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2021-05-01 08:25:37,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-01 08:25:37,375 INFO L511 BasicCegarLoop]: Found error trace [2021-05-01 08:25:37,375 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-01 08:25:37,375 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-01 08:25:37,375 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-01 08:25:37,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-01 08:25:37,376 INFO L82 PathProgramCache]: Analyzing trace with hash 1070997212, now seen corresponding path program 1 times [2021-05-01 08:25:37,376 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-01 08:25:37,377 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [43557378] [2021-05-01 08:25:37,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-01 08:25:37,380 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-01 08:25:37,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-01 08:25:37,479 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-05-01 08:25:37,480 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-05-01 08:25:37,483 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-05-01 08:25:37,483 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-05-01 08:25:37,483 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-05-01 08:25:37,484 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-05-01 08:25:37,487 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-05-01 08:25:37,487 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-05-01 08:25:37,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-01 08:25:37,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-01 08:25:37,539 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-05-01 08:25:37,541 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-05-01 08:25:37,541 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 08:25:37,541 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-01 08:25:37,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [43557378] [2021-05-01 08:25:37,542 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [43557378] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-01 08:25:37,542 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-01 08:25:37,542 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-01 08:25:37,542 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502547619] [2021-05-01 08:25:37,543 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-01 08:25:37,543 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-01 08:25:37,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-01 08:25:37,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-01 08:25:37,544 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) [2021-05-01 08:25:37,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-01 08:25:37,658 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-05-01 08:25:37,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-01 08:25:37,660 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 [2021-05-01 08:25:37,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-01 08:25:37,661 INFO L225 Difference]: With dead ends: 32 [2021-05-01 08:25:37,661 INFO L226 Difference]: Without dead ends: 23 [2021-05-01 08:25:37,663 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 61.5ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-01 08:25:37,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-01 08:25:37,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-01 08:25:37,682 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) [2021-05-01 08:25:37,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 29 transitions. [2021-05-01 08:25:37,683 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 29 transitions. Word has length 12 [2021-05-01 08:25:37,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-01 08:25:37,683 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 29 transitions. [2021-05-01 08:25:37,683 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) [2021-05-01 08:25:37,683 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 29 transitions. [2021-05-01 08:25:37,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-01 08:25:37,684 INFO L511 BasicCegarLoop]: Found error trace [2021-05-01 08:25:37,684 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-01 08:25:37,684 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-01 08:25:37,684 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-01 08:25:37,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-01 08:25:37,685 INFO L82 PathProgramCache]: Analyzing trace with hash 1072665508, now seen corresponding path program 1 times [2021-05-01 08:25:37,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-01 08:25:37,685 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1472175076] [2021-05-01 08:25:37,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-01 08:25:37,687 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-01 08:25:37,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-01 08:25:37,710 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-05-01 08:25:37,710 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-05-01 08:25:37,714 INFO L142 QuantifierPusher]: treesize reduction 2, result has 86.7 percent of original size [2021-05-01 08:25:37,714 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 13 [2021-05-01 08:25:37,719 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-05-01 08:25:37,719 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-05-01 08:25:37,722 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-05-01 08:25:37,723 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-05-01 08:25:37,727 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-05-01 08:25:37,727 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-05-01 08:25:37,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-01 08:25:37,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-01 08:25:37,759 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-05-01 08:25:37,760 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-05-01 08:25:37,760 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 08:25:37,760 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-01 08:25:37,760 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1472175076] [2021-05-01 08:25:37,760 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1472175076] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-01 08:25:37,761 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-01 08:25:37,761 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-01 08:25:37,761 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880639728] [2021-05-01 08:25:37,761 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-01 08:25:37,761 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-01 08:25:37,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-01 08:25:37,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-01 08:25:37,762 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) [2021-05-01 08:25:37,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-01 08:25:37,960 INFO L93 Difference]: Finished difference Result 36 states and 47 transitions. [2021-05-01 08:25:37,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-01 08:25:37,961 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 [2021-05-01 08:25:37,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-01 08:25:37,963 INFO L225 Difference]: With dead ends: 36 [2021-05-01 08:25:37,963 INFO L226 Difference]: Without dead ends: 34 [2021-05-01 08:25:37,964 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 113.7ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-01 08:25:37,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-01 08:25:37,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2021-05-01 08:25:37,978 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) [2021-05-01 08:25:37,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-01 08:25:37,982 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 12 [2021-05-01 08:25:37,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-01 08:25:37,982 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-01 08:25:37,983 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) [2021-05-01 08:25:37,983 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-01 08:25:37,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-01 08:25:37,983 INFO L511 BasicCegarLoop]: Found error trace [2021-05-01 08:25:37,984 INFO L519 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-01 08:25:37,984 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-01 08:25:37,985 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-01 08:25:37,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-01 08:25:37,986 INFO L82 PathProgramCache]: Analyzing trace with hash 1640566567, now seen corresponding path program 1 times [2021-05-01 08:25:37,987 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-01 08:25:37,987 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [530713155] [2021-05-01 08:25:37,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-01 08:25:38,001 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-01 08:25:38,012 WARN L167 FreeRefinementEngine]: Strategy FIXED_PREFERENCES was unsuccessful and could not determine trace feasibility [2021-05-01 08:25:38,012 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-05-01 08:25:38,015 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-01 08:25:38,027 WARN L227 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2021-05-01 08:25:38,028 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 01.05 08:25:38 BoogieIcfgContainer [2021-05-01 08:25:38,028 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-01 08:25:38,029 INFO L168 Benchmark]: Toolchain (without parser) took 1751.19 ms. Allocated memory was 222.3 MB in the beginning and 347.1 MB in the end (delta: 124.8 MB). Free memory was 187.5 MB in the beginning and 317.1 MB in the end (delta: -129.6 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-01 08:25:38,030 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 222.3 MB. Free memory is still 204.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-01 08:25:38,031 INFO L168 Benchmark]: CACSL2BoogieTranslator took 231.65 ms. Allocated memory is still 222.3 MB. Free memory was 187.3 MB in the beginning and 177.4 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-01 08:25:38,034 INFO L168 Benchmark]: Boogie Preprocessor took 78.39 ms. Allocated memory is still 222.3 MB. Free memory was 177.4 MB in the beginning and 205.2 MB in the end (delta: -27.8 MB). Peak memory consumption was 4.3 MB. Max. memory is 8.0 GB. [2021-05-01 08:25:38,035 INFO L168 Benchmark]: RCFGBuilder took 310.42 ms. Allocated memory is still 222.3 MB. Free memory was 204.8 MB in the beginning and 190.5 MB in the end (delta: 14.3 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-01 08:25:38,035 INFO L168 Benchmark]: TraceAbstraction took 1122.03 ms. Allocated memory was 222.3 MB in the beginning and 347.1 MB in the end (delta: 124.8 MB). Free memory was 190.1 MB in the beginning and 317.1 MB in the end (delta: -126.9 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-01 08:25:38,038 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 222.3 MB. Free memory is still 204.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 231.65 ms. Allocated memory is still 222.3 MB. Free memory was 187.3 MB in the beginning and 177.4 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 78.39 ms. Allocated memory is still 222.3 MB. Free memory was 177.4 MB in the beginning and 205.2 MB in the end (delta: -27.8 MB). Peak memory consumption was 4.3 MB. Max. memory is 8.0 GB. * RCFGBuilder took 310.42 ms. Allocated memory is still 222.3 MB. Free memory was 204.8 MB in the beginning and 190.5 MB in the end (delta: 14.3 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1122.03 ms. Allocated memory was 222.3 MB in the beginning and 347.1 MB in the end (delta: 124.8 MB). Free memory was 190.1 MB in the beginning and 317.1 MB in the end (delta: -126.9 MB). There was no memory consumed. 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++<50 [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: 1073.6ms, OverallIterations: 4, TraceHistogramMax: 2, EmptinessCheckTime: 26.1ms, AutomataDifference: 456.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 10.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 79 SDtfs, 28 SDslu, 89 SDs, 0 SdLazy, 109 SolverSat, 29 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 178.0ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 22 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 225.6ms 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: 60.1ms 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...