/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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-06 22:45:10,280 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-06 22:45:10,283 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-06 22:45:10,341 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-06 22:45:10,342 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-06 22:45:10,347 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-06 22:45:10,351 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-06 22:45:10,360 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-06 22:45:10,364 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-06 22:45:10,372 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-06 22:45:10,373 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-06 22:45:10,375 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-06 22:45:10,376 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-06 22:45:10,379 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-06 22:45:10,382 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-06 22:45:10,384 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-06 22:45:10,385 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-06 22:45:10,389 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-06 22:45:10,397 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-06 22:45:10,445 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-06 22:45:10,450 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-06 22:45:10,456 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-06 22:45:10,459 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-06 22:45:10,472 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-06 22:45:10,481 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-06 22:45:10,494 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-06 22:45:10,495 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-06 22:45:10,496 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-06 22:45:10,498 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-06 22:45:10,559 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-06 22:45:10,560 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-06 22:45:10,564 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-06 22:45:10,565 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-06 22:45:10,565 INFO L138 SettingsManager]: * Use SBE=true [2020-11-06 22:45:10,565 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-06 22:45:10,565 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-06 22:45:10,565 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-06 22:45:10,566 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-06 22:45:10,566 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-06 22:45:10,567 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-06 22:45:10,567 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-06 22:45:10,568 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-06 22:45:10,568 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-06 22:45:10,568 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-06 22:45:10,568 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-06 22:45:10,568 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-06 22:45:10,569 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-06 22:45:10,569 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-06 22:45:10,569 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-06 22:45:10,569 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-06 22:45:10,570 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-06 22:45:10,570 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-06 22:45:10,570 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-06 22:45:10,570 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-06 22:45:10,571 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-06 22:45:10,571 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-06 22:45:10,571 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-06 22:45:10,571 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-06 22:45:10,571 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-11-06 22:45:11,013 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-06 22:45:11,045 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-06 22:45:11,050 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-06 22:45:11,051 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-06 22:45:11,052 INFO L275 PluginConnector]: CDTParser initialized [2020-11-06 22:45:11,053 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2020-11-06 22:45:11,144 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8d29a188/5e67bb2006fd415483e2341e5303b5b7/FLAG385079ef2 [2020-11-06 22:45:11,695 INFO L306 CDTParser]: Found 1 translation units. [2020-11-06 22:45:11,695 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i [2020-11-06 22:45:11,705 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8d29a188/5e67bb2006fd415483e2341e5303b5b7/FLAG385079ef2 [2020-11-06 22:45:12,055 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8d29a188/5e67bb2006fd415483e2341e5303b5b7 [2020-11-06 22:45:12,059 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-06 22:45:12,068 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-06 22:45:12,076 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-06 22:45:12,077 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-06 22:45:12,082 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-06 22:45:12,084 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:45:12" (1/1) ... [2020-11-06 22:45:12,094 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@48b15ed5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12, skipping insertion in model container [2020-11-06 22:45:12,094 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:45:12" (1/1) ... [2020-11-06 22:45:12,106 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-06 22:45:12,135 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-06 22:45:12,418 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:45:12,430 INFO L203 MainTranslator]: Completed pre-run [2020-11-06 22:45:12,455 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:45:12,472 INFO L208 MainTranslator]: Completed translation [2020-11-06 22:45:12,473 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12 WrapperNode [2020-11-06 22:45:12,473 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-06 22:45:12,474 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-06 22:45:12,474 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-06 22:45:12,475 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-06 22:45:12,508 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (1/1) ... [2020-11-06 22:45:12,510 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (1/1) ... [2020-11-06 22:45:12,539 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (1/1) ... [2020-11-06 22:45:12,540 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (1/1) ... [2020-11-06 22:45:12,551 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (1/1) ... [2020-11-06 22:45:12,558 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (1/1) ... [2020-11-06 22:45:12,560 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (1/1) ... [2020-11-06 22:45:12,563 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-06 22:45:12,565 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-06 22:45:12,565 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-06 22:45:12,565 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-06 22:45:12,566 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (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 [2020-11-06 22:45:12,652 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-06 22:45:12,653 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-06 22:45:12,653 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-06 22:45:12,654 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-11-06 22:45:12,654 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-11-06 22:45:12,655 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-06 22:45:12,655 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-06 22:45:12,655 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-06 22:45:12,656 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2020-11-06 22:45:12,656 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2020-11-06 22:45:12,657 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-06 22:45:12,657 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-06 22:45:12,657 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-11-06 22:45:12,658 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-11-06 22:45:12,658 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-11-06 22:45:12,659 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-06 22:45:12,659 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-06 22:45:12,660 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-06 22:45:12,660 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-06 22:45:12,660 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-06 22:45:12,660 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-06 22:45:12,660 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-06 22:45:13,326 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-06 22:45:13,326 INFO L298 CfgBuilder]: Removed 5 assume(true) statements. [2020-11-06 22:45:13,328 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:45:13 BoogieIcfgContainer [2020-11-06 22:45:13,328 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-06 22:45:13,330 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-06 22:45:13,330 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-06 22:45:13,334 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-06 22:45:13,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:45:12" (1/3) ... [2020-11-06 22:45:13,335 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22890a80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:45:13, skipping insertion in model container [2020-11-06 22:45:13,335 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:12" (2/3) ... [2020-11-06 22:45:13,336 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22890a80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:45:13, skipping insertion in model container [2020-11-06 22:45:13,336 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:45:13" (3/3) ... [2020-11-06 22:45:13,337 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-11-06 22:45:13,353 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-06 22:45:13,358 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-06 22:45:13,371 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-06 22:45:13,399 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-06 22:45:13,399 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-06 22:45:13,399 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-06 22:45:13,399 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-06 22:45:13,399 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-06 22:45:13,400 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-06 22:45:13,400 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-06 22:45:13,400 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-06 22:45:13,418 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2020-11-06 22:45:13,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-11-06 22:45:13,425 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:13,426 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:45:13,426 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:13,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:13,433 INFO L82 PathProgramCache]: Analyzing trace with hash 1881354354, now seen corresponding path program 1 times [2020-11-06 22:45:13,443 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:13,444 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [909900418] [2020-11-06 22:45:13,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:13,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:13,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:13,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:13,692 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:45:13,692 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [909900418] [2020-11-06 22:45:13,693 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:45:13,694 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-06 22:45:13,695 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393174841] [2020-11-06 22:45:13,700 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-06 22:45:13,700 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:13,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-06 22:45:13,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-06 22:45:13,718 INFO L87 Difference]: Start difference. First operand 40 states. Second operand 4 states. [2020-11-06 22:45:13,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:13,910 INFO L93 Difference]: Finished difference Result 80 states and 119 transitions. [2020-11-06 22:45:13,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-06 22:45:13,913 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 24 [2020-11-06 22:45:13,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:13,923 INFO L225 Difference]: With dead ends: 80 [2020-11-06 22:45:13,923 INFO L226 Difference]: Without dead ends: 38 [2020-11-06 22:45:13,927 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-06 22:45:13,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-11-06 22:45:13,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2020-11-06 22:45:13,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-11-06 22:45:13,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2020-11-06 22:45:13,976 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 24 [2020-11-06 22:45:13,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:13,977 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2020-11-06 22:45:13,977 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-06 22:45:13,977 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2020-11-06 22:45:13,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-11-06 22:45:13,979 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:13,979 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:45:13,980 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-06 22:45:13,980 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:13,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:13,981 INFO L82 PathProgramCache]: Analyzing trace with hash -607743226, now seen corresponding path program 1 times [2020-11-06 22:45:13,981 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:13,982 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1979166155] [2020-11-06 22:45:13,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:14,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:14,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:14,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:14,112 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:45:14,113 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1979166155] [2020-11-06 22:45:14,113 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675329683] [2020-11-06 22:45:14,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:14,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:14,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-06 22:45:14,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:45:14,260 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:45:14,261 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:45:14,261 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2020-11-06 22:45:14,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116205460] [2020-11-06 22:45:14,263 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-06 22:45:14,264 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:14,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-06 22:45:14,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:45:14,265 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand 6 states. [2020-11-06 22:45:14,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:14,426 INFO L93 Difference]: Finished difference Result 69 states and 84 transitions. [2020-11-06 22:45:14,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-06 22:45:14,426 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 30 [2020-11-06 22:45:14,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:14,428 INFO L225 Difference]: With dead ends: 69 [2020-11-06 22:45:14,428 INFO L226 Difference]: Without dead ends: 46 [2020-11-06 22:45:14,430 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:45:14,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-11-06 22:45:14,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 36. [2020-11-06 22:45:14,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-11-06 22:45:14,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-11-06 22:45:14,440 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 30 [2020-11-06 22:45:14,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:14,440 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-11-06 22:45:14,440 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-06 22:45:14,440 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-11-06 22:45:14,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-11-06 22:45:14,442 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:14,442 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:45:14,657 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-11-06 22:45:14,659 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:14,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:14,661 INFO L82 PathProgramCache]: Analyzing trace with hash 726160326, now seen corresponding path program 2 times [2020-11-06 22:45:14,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:14,662 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190777278] [2020-11-06 22:45:14,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:14,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:14,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:14,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:14,780 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-06 22:45:14,781 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190777278] [2020-11-06 22:45:14,781 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1151074556] [2020-11-06 22:45:14,782 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:14,858 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-06 22:45:14,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:45:14,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-06 22:45:14,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:45:14,915 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-06 22:45:14,916 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:45:14,916 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2020-11-06 22:45:14,916 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840464677] [2020-11-06 22:45:14,917 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-06 22:45:14,917 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:14,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-06 22:45:14,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-11-06 22:45:14,918 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 7 states. [2020-11-06 22:45:15,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:15,076 INFO L93 Difference]: Finished difference Result 79 states and 96 transitions. [2020-11-06 22:45:15,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:45:15,077 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 34 [2020-11-06 22:45:15,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:15,078 INFO L225 Difference]: With dead ends: 79 [2020-11-06 22:45:15,079 INFO L226 Difference]: Without dead ends: 54 [2020-11-06 22:45:15,080 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-11-06 22:45:15,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-11-06 22:45:15,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 40. [2020-11-06 22:45:15,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-11-06 22:45:15,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2020-11-06 22:45:15,111 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 34 [2020-11-06 22:45:15,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:15,112 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2020-11-06 22:45:15,112 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-06 22:45:15,112 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2020-11-06 22:45:15,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-11-06 22:45:15,118 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:15,118 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:45:15,334 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:15,335 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:15,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:15,336 INFO L82 PathProgramCache]: Analyzing trace with hash -486268026, now seen corresponding path program 3 times [2020-11-06 22:45:15,336 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:15,336 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [44408791] [2020-11-06 22:45:15,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:15,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:15,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:15,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:15,556 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-06 22:45:15,557 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [44408791] [2020-11-06 22:45:15,557 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [786978607] [2020-11-06 22:45:15,558 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:15,649 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-11-06 22:45:15,649 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:45:15,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 5 conjunts are in the unsatisfiable core [2020-11-06 22:45:15,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:45:15,688 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-06 22:45:15,689 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:45:15,689 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2020-11-06 22:45:15,689 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710887049] [2020-11-06 22:45:15,690 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-06 22:45:15,690 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:15,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-06 22:45:15,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-11-06 22:45:15,692 INFO L87 Difference]: Start difference. First operand 40 states and 45 transitions. Second operand 8 states. [2020-11-06 22:45:15,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:15,876 INFO L93 Difference]: Finished difference Result 89 states and 108 transitions. [2020-11-06 22:45:15,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-06 22:45:15,877 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 38 [2020-11-06 22:45:15,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:15,878 INFO L225 Difference]: With dead ends: 89 [2020-11-06 22:45:15,878 INFO L226 Difference]: Without dead ends: 62 [2020-11-06 22:45:15,879 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-11-06 22:45:15,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-11-06 22:45:15,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 44. [2020-11-06 22:45:15,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-11-06 22:45:15,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 49 transitions. [2020-11-06 22:45:15,889 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 49 transitions. Word has length 38 [2020-11-06 22:45:15,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:15,889 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 49 transitions. [2020-11-06 22:45:15,889 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-06 22:45:15,889 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 49 transitions. [2020-11-06 22:45:15,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-11-06 22:45:15,891 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:15,891 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:45:16,104 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:16,105 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:16,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:16,106 INFO L82 PathProgramCache]: Analyzing trace with hash 687522374, now seen corresponding path program 4 times [2020-11-06 22:45:16,108 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:16,108 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760193560] [2020-11-06 22:45:16,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:16,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:16,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:16,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:16,274 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-11-06 22:45:16,275 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760193560] [2020-11-06 22:45:16,275 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [301434107] [2020-11-06 22:45:16,276 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:16,341 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-06 22:45:16,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:45:16,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-06 22:45:16,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:45:16,382 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-11-06 22:45:16,383 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:45:16,383 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2020-11-06 22:45:16,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674484343] [2020-11-06 22:45:16,384 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-06 22:45:16,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:16,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-06 22:45:16,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:45:16,385 INFO L87 Difference]: Start difference. First operand 44 states and 49 transitions. Second operand 9 states. [2020-11-06 22:45:16,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:16,592 INFO L93 Difference]: Finished difference Result 97 states and 118 transitions. [2020-11-06 22:45:16,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-06 22:45:16,593 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 42 [2020-11-06 22:45:16,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:16,594 INFO L225 Difference]: With dead ends: 97 [2020-11-06 22:45:16,595 INFO L226 Difference]: Without dead ends: 68 [2020-11-06 22:45:16,595 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:45:16,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-11-06 22:45:16,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 48. [2020-11-06 22:45:16,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-11-06 22:45:16,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-11-06 22:45:16,604 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 42 [2020-11-06 22:45:16,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:16,605 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-11-06 22:45:16,605 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-06 22:45:16,605 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-11-06 22:45:16,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-11-06 22:45:16,606 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:16,607 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:45:16,822 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:16,823 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:16,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:16,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1304227846, now seen corresponding path program 5 times [2020-11-06 22:45:16,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:16,825 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433146851] [2020-11-06 22:45:16,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:16,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:45:16,889 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:45:16,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:45:16,958 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:45:17,002 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-06 22:45:17,003 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-06 22:45:17,003 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-11-06 22:45:17,092 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.11 10:45:17 BoogieIcfgContainer [2020-11-06 22:45:17,093 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-06 22:45:17,096 INFO L168 Benchmark]: Toolchain (without parser) took 5032.26 ms. Allocated memory was 151.0 MB in the beginning and 185.6 MB in the end (delta: 34.6 MB). Free memory was 132.0 MB in the beginning and 149.1 MB in the end (delta: -17.0 MB). Peak memory consumption was 17.5 MB. Max. memory is 8.0 GB. [2020-11-06 22:45:17,096 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 151.0 MB. Free memory was 123.8 MB in the beginning and 123.7 MB in the end (delta: 74.3 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-11-06 22:45:17,097 INFO L168 Benchmark]: CACSL2BoogieTranslator took 397.30 ms. Allocated memory is still 151.0 MB. Free memory was 131.4 MB in the beginning and 121.2 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2020-11-06 22:45:17,098 INFO L168 Benchmark]: Boogie Preprocessor took 89.15 ms. Allocated memory is still 151.0 MB. Free memory was 121.2 MB in the beginning and 133.7 MB in the end (delta: -12.5 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. [2020-11-06 22:45:17,099 INFO L168 Benchmark]: RCFGBuilder took 763.71 ms. Allocated memory is still 151.0 MB. Free memory was 133.7 MB in the beginning and 114.8 MB in the end (delta: 18.9 MB). Peak memory consumption was 18.9 MB. Max. memory is 8.0 GB. [2020-11-06 22:45:17,100 INFO L168 Benchmark]: TraceAbstraction took 3762.66 ms. Allocated memory was 151.0 MB in the beginning and 185.6 MB in the end (delta: 34.6 MB). Free memory was 114.4 MB in the beginning and 149.1 MB in the end (delta: -34.7 MB). Peak memory consumption was 766.2 kB. Max. memory is 8.0 GB. [2020-11-06 22:45:17,104 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 151.0 MB. Free memory was 123.8 MB in the beginning and 123.7 MB in the end (delta: 74.3 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 397.30 ms. Allocated memory is still 151.0 MB. Free memory was 131.4 MB in the beginning and 121.2 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 89.15 ms. Allocated memory is still 151.0 MB. Free memory was 121.2 MB in the beginning and 133.7 MB in the end (delta: -12.5 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 763.71 ms. Allocated memory is still 151.0 MB. Free memory was 133.7 MB in the beginning and 114.8 MB in the end (delta: 18.9 MB). Peak memory consumption was 18.9 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3762.66 ms. Allocated memory was 151.0 MB in the beginning and 185.6 MB in the end (delta: 34.6 MB). Free memory was 114.4 MB in the beginning and 149.1 MB in the end (delta: -34.7 MB). Peak memory consumption was 766.2 kB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 12]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 69. Possible FailurePath: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 VAL [found=0, i=0, string_A={6:0}, string_B={9:0}] [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ VAL [found=0, i=1, string_A={6:0}, string_B={9:0}] [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ VAL [found=0, i=2, string_A={6:0}, string_B={9:0}] [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ VAL [found=0, i=3, string_A={6:0}, string_B={9:0}] [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ VAL [found=0, i=4, string_A={6:0}, string_B={9:0}] [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ VAL [found=0, i=5, string_A={6:0}, string_B={9:0}] [L35] COND FALSE !(i<5) VAL [found=0, i=5, string_A={6:0}, string_B={9:0}] [L37] EXPR string_A[5 -1] VAL [found=0, i=5, string_A={6:0}, string_A[5 -1]=0, string_B={9:0}] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 VAL [found=0, i=0, string_A={6:0}, string_B={9:0}] [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ VAL [found=0, i=1, string_A={6:0}, string_B={9:0}] [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ VAL [found=0, i=2, string_A={6:0}, string_B={9:0}] [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ VAL [found=0, i=3, string_A={6:0}, string_B={9:0}] [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ VAL [found=0, i=4, string_A={6:0}, string_B={9:0}] [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ VAL [found=0, i=5, string_A={6:0}, string_B={9:0}] [L39] COND FALSE !(i<5) VAL [found=0, i=5, string_A={6:0}, string_B={9:0}] [L41] EXPR string_B[5 -1] VAL [found=0, i=5, string_A={6:0}, string_B={9:0}, string_B[5 -1]=0] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={6:0}, string_B={9:0}] [L44] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={6:0}, string_A[nc_A]=0, string_B={9:0}] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={6:0}, string_B={9:0}] [L48] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={6:0}, string_B={9:0}, string_B[nc_B]=0] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 VAL [found=0, i=0, j=0, nc_A=0, nc_B=0, string_A={6:0}, string_B={9:0}] [L55] COND FALSE !((inc_B-1)<