/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/loop-acceleration/underapprox_2-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 18:43:45,027 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 18:43:45,031 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 18:43:45,089 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-23 18:43:45,089 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-23 18:43:45,091 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-23 18:43:45,092 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-23 18:43:45,095 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-23 18:43:45,097 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-23 18:43:45,098 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-23 18:43:45,099 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-23 18:43:45,101 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-23 18:43:45,101 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 18:43:45,102 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 18:43:45,104 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 18:43:45,105 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 18:43:45,106 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 18:43:45,107 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 18:43:45,109 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 18:43:45,111 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 18:43:45,113 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 18:43:45,115 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 18:43:45,116 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 18:43:45,117 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 18:43:45,134 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 18:43:45,150 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 18:43:45,151 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 18:43:45,153 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 18:43:45,154 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 [2020-10-23 18:43:45,205 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 18:43:45,205 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 18:43:45,207 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-23 18:43:45,207 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-23 18:43:45,207 INFO L138 SettingsManager]: * Use SBE=true [2020-10-23 18:43:45,207 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 18:43:45,208 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 18:43:45,208 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 18:43:45,208 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 18:43:45,208 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 18:43:45,209 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 18:43:45,209 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 18:43:45,209 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 18:43:45,209 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 18:43:45,210 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 18:43:45,210 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 18:43:45,210 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 18:43:45,210 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 18:43:45,210 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-23 18:43:45,211 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 18:43:45,211 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 18:43:45,211 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 18:43:45,211 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 18:43:45,212 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-23 18:43:45,212 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-23 18:43:45,212 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-23 18:43:45,212 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-23 18:43:45,213 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 18:43:45,213 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-23 18:43:45,213 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 18:43:45,591 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 18:43:45,641 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 18:43:45,644 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 18:43:45,646 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 18:43:45,646 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 18:43:45,648 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-2.c [2020-10-23 18:43:45,731 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d6a10ff8/1a89231b0edf499a9fa4e912c53ca387/FLAG77d24615e [2020-10-23 18:43:46,335 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 18:43:46,336 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_2-2.c [2020-10-23 18:43:46,343 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d6a10ff8/1a89231b0edf499a9fa4e912c53ca387/FLAG77d24615e [2020-10-23 18:43:46,720 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d6a10ff8/1a89231b0edf499a9fa4e912c53ca387 [2020-10-23 18:43:46,723 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 18:43:46,731 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 18:43:46,734 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 18:43:46,734 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 18:43:46,739 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 18:43:46,740 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:43:46" (1/1) ... [2020-10-23 18:43:46,748 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3328c684 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:46, skipping insertion in model container [2020-10-23 18:43:46,748 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:43:46" (1/1) ... [2020-10-23 18:43:46,759 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 18:43:46,779 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 18:43:46,987 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:43:46,998 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 18:43:47,015 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:43:47,034 INFO L208 MainTranslator]: Completed translation [2020-10-23 18:43:47,035 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:47 WrapperNode [2020-10-23 18:43:47,035 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 18:43:47,037 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 18:43:47,037 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 18:43:47,037 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 18:43:47,051 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:47" (1/1) ... [2020-10-23 18:43:47,051 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:47" (1/1) ... [2020-10-23 18:43:47,059 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:47" (1/1) ... [2020-10-23 18:43:47,059 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:47" (1/1) ... [2020-10-23 18:43:47,066 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:47" (1/1) ... [2020-10-23 18:43:47,070 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:47" (1/1) ... [2020-10-23 18:43:47,072 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:47" (1/1) ... [2020-10-23 18:43:47,074 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 18:43:47,075 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 18:43:47,075 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 18:43:47,075 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 18:43:47,076 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:47" (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 [2020-10-23 18:43:47,154 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 18:43:47,154 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 18:43:47,155 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 18:43:47,155 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-23 18:43:47,155 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 18:43:47,155 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 18:43:47,155 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 18:43:47,156 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 18:43:47,156 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 18:43:47,156 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-23 18:43:47,156 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 18:43:47,156 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 18:43:47,157 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 18:43:47,157 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 18:43:47,157 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 18:43:47,157 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 18:43:47,157 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 18:43:47,509 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 18:43:47,510 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-23 18:43:47,511 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:43:47 BoogieIcfgContainer [2020-10-23 18:43:47,512 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 18:43:47,514 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 18:43:47,514 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 18:43:47,518 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 18:43:47,518 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 06:43:46" (1/3) ... [2020-10-23 18:43:47,519 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a3eed91 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:43:47, skipping insertion in model container [2020-10-23 18:43:47,520 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:47" (2/3) ... [2020-10-23 18:43:47,520 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a3eed91 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:43:47, skipping insertion in model container [2020-10-23 18:43:47,520 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:43:47" (3/3) ... [2020-10-23 18:43:47,522 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_2-2.c [2020-10-23 18:43:47,538 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-23 18:43:47,544 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 18:43:47,560 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 18:43:47,608 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 18:43:47,608 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 18:43:47,609 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-23 18:43:47,609 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 18:43:47,609 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 18:43:47,609 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 18:43:47,609 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 18:43:47,609 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 18:43:47,627 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-10-23 18:43:47,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-10-23 18:43:47,633 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:43:47,634 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:43:47,634 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:43:47,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:43:47,641 INFO L82 PathProgramCache]: Analyzing trace with hash 783588435, now seen corresponding path program 1 times [2020-10-23 18:43:47,667 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:43:47,667 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284790342] [2020-10-23 18:43:47,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:43:47,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:48,011 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-10-23 18:43:48,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:43:48,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:48,053 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:48,054 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284790342] [2020-10-23 18:43:48,055 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:43:48,055 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-23 18:43:48,056 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946403207] [2020-10-23 18:43:48,061 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-23 18:43:48,061 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:43:48,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-23 18:43:48,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 18:43:48,080 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 3 states. [2020-10-23 18:43:48,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:43:48,175 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2020-10-23 18:43:48,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-23 18:43:48,178 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-10-23 18:43:48,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:43:48,185 INFO L225 Difference]: With dead ends: 34 [2020-10-23 18:43:48,186 INFO L226 Difference]: Without dead ends: 13 [2020-10-23 18:43:48,189 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 18:43:48,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-10-23 18:43:48,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-10-23 18:43:48,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-10-23 18:43:48,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-10-23 18:43:48,235 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 12 [2020-10-23 18:43:48,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:43:48,236 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-10-23 18:43:48,236 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-23 18:43:48,236 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-10-23 18:43:48,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-10-23 18:43:48,237 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:43:48,237 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:43:48,238 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 18:43:48,238 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:43:48,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:43:48,239 INFO L82 PathProgramCache]: Analyzing trace with hash 669071831, now seen corresponding path program 1 times [2020-10-23 18:43:48,239 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:43:48,240 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103538067] [2020-10-23 18:43:48,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:43:48,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:48,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:43:48,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:48,416 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:48,417 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103538067] [2020-10-23 18:43:48,417 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:43:48,417 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:43:48,418 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939644854] [2020-10-23 18:43:48,419 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:43:48,419 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:43:48,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:43:48,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:43:48,421 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 4 states. [2020-10-23 18:43:48,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:43:48,588 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-10-23 18:43:48,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:43:48,589 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-10-23 18:43:48,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:43:48,590 INFO L225 Difference]: With dead ends: 20 [2020-10-23 18:43:48,590 INFO L226 Difference]: Without dead ends: 14 [2020-10-23 18:43:48,592 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 18:43:48,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-10-23 18:43:48,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-10-23 18:43:48,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-10-23 18:43:48,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-10-23 18:43:48,600 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-10-23 18:43:48,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:43:48,601 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-10-23 18:43:48,601 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:43:48,601 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-10-23 18:43:48,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-10-23 18:43:48,602 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:43:48,602 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:43:48,602 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 18:43:48,603 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:43:48,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:43:48,603 INFO L82 PathProgramCache]: Analyzing trace with hash 396678398, now seen corresponding path program 1 times [2020-10-23 18:43:48,604 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:43:48,604 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157827760] [2020-10-23 18:43:48,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:43:48,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:48,727 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:43:48,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:48,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:48,743 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [157827760] [2020-10-23 18:43:48,743 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [241377417] [2020-10-23 18:43:48,744 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 [2020-10-23 18:43:48,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:48,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 5 conjunts are in the unsatisfiable core [2020-10-23 18:43:48,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:43:48,859 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:48,860 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:43:48,860 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2020-10-23 18:43:48,860 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909437254] [2020-10-23 18:43:48,861 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 18:43:48,861 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:43:48,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 18:43:48,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-10-23 18:43:48,863 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-10-23 18:43:48,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:43:48,991 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-10-23 18:43:48,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-23 18:43:48,992 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-10-23 18:43:48,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:43:48,993 INFO L225 Difference]: With dead ends: 21 [2020-10-23 18:43:48,993 INFO L226 Difference]: Without dead ends: 15 [2020-10-23 18:43:48,994 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2020-10-23 18:43:48,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-10-23 18:43:49,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-10-23 18:43:49,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-10-23 18:43:49,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-10-23 18:43:49,002 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-10-23 18:43:49,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:43:49,002 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-10-23 18:43:49,003 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 18:43:49,003 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-10-23 18:43:49,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-10-23 18:43:49,004 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:43:49,004 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:43:49,206 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-10-23 18:43:49,207 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:43:49,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:43:49,209 INFO L82 PathProgramCache]: Analyzing trace with hash 542416567, now seen corresponding path program 2 times [2020-10-23 18:43:49,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:43:49,210 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [519447418] [2020-10-23 18:43:49,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:43:49,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:49,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:43:49,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:49,404 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:49,405 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [519447418] [2020-10-23 18:43:49,405 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1815875278] [2020-10-23 18:43:49,405 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 [2020-10-23 18:43:49,461 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-23 18:43:49,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:43:49,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 10 conjunts are in the unsatisfiable core [2020-10-23 18:43:49,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:43:49,487 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:49,488 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:43:49,488 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2020-10-23 18:43:49,488 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402777013] [2020-10-23 18:43:49,489 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-23 18:43:49,489 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:43:49,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-23 18:43:49,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-23 18:43:49,490 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-10-23 18:43:49,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:43:49,635 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-10-23 18:43:49,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 18:43:49,636 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-10-23 18:43:49,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:43:49,636 INFO L225 Difference]: With dead ends: 22 [2020-10-23 18:43:49,637 INFO L226 Difference]: Without dead ends: 16 [2020-10-23 18:43:49,637 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-10-23 18:43:49,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-10-23 18:43:49,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-10-23 18:43:49,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-10-23 18:43:49,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-10-23 18:43:49,644 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-10-23 18:43:49,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:43:49,644 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-10-23 18:43:49,645 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-23 18:43:49,645 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-10-23 18:43:49,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-23 18:43:49,645 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:43:49,646 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:43:49,859 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:43:49,860 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:43:49,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:43:49,861 INFO L82 PathProgramCache]: Analyzing trace with hash 765332510, now seen corresponding path program 3 times [2020-10-23 18:43:49,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:43:49,863 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1544442935] [2020-10-23 18:43:49,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:43:49,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:50,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:43:50,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:50,031 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:50,032 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1544442935] [2020-10-23 18:43:50,032 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500162930] [2020-10-23 18:43:50,033 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 [2020-10-23 18:43:50,079 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-10-23 18:43:50,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:43:50,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-23 18:43:50,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:43:50,167 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2020-10-23 18:43:50,212 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-10-23 18:43:50,213 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-10-23 18:43:50,213 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7] total 11 [2020-10-23 18:43:50,213 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694926068] [2020-10-23 18:43:50,214 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 18:43:50,214 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:43:50,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 18:43:50,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2020-10-23 18:43:50,216 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 6 states. [2020-10-23 18:43:50,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:43:50,250 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2020-10-23 18:43:50,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 18:43:50,250 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-10-23 18:43:50,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:43:50,251 INFO L225 Difference]: With dead ends: 16 [2020-10-23 18:43:50,251 INFO L226 Difference]: Without dead ends: 0 [2020-10-23 18:43:50,252 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-10-23 18:43:50,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-10-23 18:43:50,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-10-23 18:43:50,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-10-23 18:43:50,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-10-23 18:43:50,253 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2020-10-23 18:43:50,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:43:50,253 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-10-23 18:43:50,253 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 18:43:50,253 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-10-23 18:43:50,253 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-10-23 18:43:50,459 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:43:50,462 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-10-23 18:43:50,644 INFO L274 CegarLoopResult]: For program point reach_errorEXIT(line 3) no Hoare annotation was computed. [2020-10-23 18:43:50,645 INFO L277 CegarLoopResult]: At program point reach_errorENTRY(line 3) the Hoare annotation is: true [2020-10-23 18:43:50,645 INFO L274 CegarLoopResult]: For program point reach_errorFINAL(line 3) no Hoare annotation was computed. [2020-10-23 18:43:50,645 INFO L274 CegarLoopResult]: For program point reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION(line 3) no Hoare annotation was computed. [2020-10-23 18:43:50,645 INFO L274 CegarLoopResult]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2020-10-23 18:43:50,646 INFO L270 CegarLoopResult]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2020-10-23 18:43:50,646 INFO L274 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-10-23 18:43:50,648 INFO L274 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-10-23 18:43:50,648 INFO L277 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-10-23 18:43:50,648 INFO L277 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-10-23 18:43:50,648 INFO L274 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-10-23 18:43:50,649 INFO L277 CegarLoopResult]: At program point mainENTRY(lines 12 22) the Hoare annotation is: true [2020-10-23 18:43:50,649 INFO L274 CegarLoopResult]: For program point mainEXIT(lines 12 22) no Hoare annotation was computed. [2020-10-23 18:43:50,649 INFO L270 CegarLoopResult]: At program point L16-2(lines 16 19) the Hoare annotation is: (or (= main_~x~0 0) (< (mod (+ main_~x~0 4294967295) 4294967296) 6)) [2020-10-23 18:43:50,650 INFO L270 CegarLoopResult]: At program point L16-3(lines 16 19) the Hoare annotation is: (and (< (mod (+ main_~x~0 4294967295) 4294967296) 6) (<= 6 (mod main_~x~0 4294967296))) [2020-10-23 18:43:50,650 INFO L274 CegarLoopResult]: For program point mainFINAL(lines 12 22) no Hoare annotation was computed. [2020-10-23 18:43:50,650 INFO L277 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 5 10) the Hoare annotation is: true [2020-10-23 18:43:50,650 INFO L274 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 5 10) no Hoare annotation was computed. [2020-10-23 18:43:50,650 INFO L270 CegarLoopResult]: At program point L7(line 7) the Hoare annotation is: (not (<= 1 |__VERIFIER_assert_#in~cond|)) [2020-10-23 18:43:50,651 INFO L274 CegarLoopResult]: For program point L6(lines 6 8) no Hoare annotation was computed. [2020-10-23 18:43:50,651 INFO L274 CegarLoopResult]: For program point L7-1(line 7) no Hoare annotation was computed. [2020-10-23 18:43:50,651 INFO L274 CegarLoopResult]: For program point L6-2(lines 5 10) no Hoare annotation was computed. [2020-10-23 18:43:50,674 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 06:43:50 BoogieIcfgContainer [2020-10-23 18:43:50,675 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 18:43:50,680 INFO L168 Benchmark]: Toolchain (without parser) took 3950.11 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 126.7 MB in the beginning and 154.2 MB in the end (delta: -27.4 MB). Peak memory consumption was 80.3 MB. Max. memory is 8.0 GB. [2020-10-23 18:43:50,681 INFO L168 Benchmark]: CDTParser took 1.25 ms. Allocated memory is still 151.0 MB. Free memory is still 124.6 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 18:43:50,683 INFO L168 Benchmark]: CACSL2BoogieTranslator took 301.74 ms. Allocated memory is still 151.0 MB. Free memory was 126.1 MB in the beginning and 117.1 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-23 18:43:50,689 INFO L168 Benchmark]: Boogie Preprocessor took 37.25 ms. Allocated memory is still 151.0 MB. Free memory was 117.1 MB in the beginning and 115.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-10-23 18:43:50,690 INFO L168 Benchmark]: RCFGBuilder took 437.13 ms. Allocated memory is still 151.0 MB. Free memory was 115.6 MB in the beginning and 103.7 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-10-23 18:43:50,691 INFO L168 Benchmark]: TraceAbstraction took 3161.31 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 103.3 MB in the beginning and 154.2 MB in the end (delta: -50.9 MB). Peak memory consumption was 57.2 MB. Max. memory is 8.0 GB. [2020-10-23 18:43:50,704 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.25 ms. Allocated memory is still 151.0 MB. Free memory is still 124.6 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 301.74 ms. Allocated memory is still 151.0 MB. Free memory was 126.1 MB in the beginning and 117.1 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 37.25 ms. Allocated memory is still 151.0 MB. Free memory was 117.1 MB in the beginning and 115.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 437.13 ms. Allocated memory is still 151.0 MB. Free memory was 115.6 MB in the beginning and 103.7 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3161.31 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 103.3 MB in the beginning and 154.2 MB in the end (delta: -50.9 MB). Peak memory consumption was 57.2 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 3]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 16]: Loop Invariant Derived loop invariant: x == 0 || (x + 4294967295) % 4294967296 < 6 - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2.8s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 58 SDtfs, 29 SDslu, 78 SDs, 0 SdLazy, 83 SolverSat, 21 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 76 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 21 PreInvPairs, 25 NumberOfFragments, 64 HoareAnnotationTreeSize, 21 FomulaSimplifications, 91 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 160 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 108 NumberOfCodeBlocks, 107 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 100 ConstructedInterpolants, 0 QuantifiedInterpolants, 4364 SizeOfPredicates, 3 NumberOfNonLiveVariables, 295 ConjunctsInSsa, 22 ConjunctsInUnsatCore, 8 InterpolantComputations, 3 PerfectInterpolantSequences, 6/20 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...