./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loop-acceleration/phases_1-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 3a877d22 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/loop-acceleration/phases_1-1.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash bc900b1bfcaecf91bc89637deaef4e1ddf2476faf43fa7e6f1e197c315ae3982 --- Real Ultimate output --- This is Ultimate 0.2.2-3a877d227dc491413fd706022d0c47cd97beb353-3a877d2 [2021-12-15 10:50:49,095 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-15 10:50:49,098 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-15 10:50:49,145 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-15 10:50:49,146 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-15 10:50:49,148 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-15 10:50:49,149 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-15 10:50:49,152 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-15 10:50:49,153 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-15 10:50:49,156 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-15 10:50:49,156 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-15 10:50:49,157 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-15 10:50:49,158 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-15 10:50:49,159 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-15 10:50:49,160 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-15 10:50:49,164 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-15 10:50:49,164 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-15 10:50:49,165 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-15 10:50:49,167 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-15 10:50:49,171 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-15 10:50:49,172 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-15 10:50:49,173 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-15 10:50:49,174 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-15 10:50:49,175 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-15 10:50:49,179 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-15 10:50:49,179 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-15 10:50:49,179 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-15 10:50:49,180 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-15 10:50:49,181 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-15 10:50:49,181 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-15 10:50:49,181 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-15 10:50:49,182 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-15 10:50:49,183 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-15 10:50:49,184 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-15 10:50:49,185 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-15 10:50:49,185 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-15 10:50:49,185 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-15 10:50:49,185 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-15 10:50:49,185 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-15 10:50:49,186 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-15 10:50:49,186 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-15 10:50:49,188 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-15 10:50:49,210 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-15 10:50:49,210 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-15 10:50:49,210 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-15 10:50:49,211 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-15 10:50:49,211 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-15 10:50:49,211 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-15 10:50:49,212 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-15 10:50:49,212 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-15 10:50:49,212 INFO L138 SettingsManager]: * Use SBE=true [2021-12-15 10:50:49,212 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-15 10:50:49,213 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-15 10:50:49,213 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-15 10:50:49,213 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-15 10:50:49,214 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-15 10:50:49,214 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-15 10:50:49,214 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-15 10:50:49,214 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-15 10:50:49,214 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-15 10:50:49,214 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-15 10:50:49,214 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-15 10:50:49,215 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-15 10:50:49,215 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-15 10:50:49,215 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-15 10:50:49,215 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-15 10:50:49,215 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-15 10:50:49,215 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-15 10:50:49,216 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-15 10:50:49,216 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-15 10:50:49,216 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-15 10:50:49,216 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-15 10:50:49,216 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-15 10:50:49,216 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-15 10:50:49,217 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-15 10:50:49,217 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-15 10:50:49,217 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bc900b1bfcaecf91bc89637deaef4e1ddf2476faf43fa7e6f1e197c315ae3982 [2021-12-15 10:50:49,403 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-15 10:50:49,426 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-15 10:50:49,428 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-15 10:50:49,429 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-15 10:50:49,429 INFO L275 PluginConnector]: CDTParser initialized [2021-12-15 10:50:49,430 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-acceleration/phases_1-1.c [2021-12-15 10:50:49,480 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a0fcbc475/d58b2ff9a4e04eafb1118f2678af814e/FLAG7f55a6cea [2021-12-15 10:50:49,782 INFO L306 CDTParser]: Found 1 translation units. [2021-12-15 10:50:49,782 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-acceleration/phases_1-1.c [2021-12-15 10:50:49,786 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a0fcbc475/d58b2ff9a4e04eafb1118f2678af814e/FLAG7f55a6cea [2021-12-15 10:50:50,232 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a0fcbc475/d58b2ff9a4e04eafb1118f2678af814e [2021-12-15 10:50:50,233 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-15 10:50:50,235 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-15 10:50:50,237 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-15 10:50:50,237 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-15 10:50:50,239 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-15 10:50:50,239 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.12 10:50:50" (1/1) ... [2021-12-15 10:50:50,240 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4eb39caa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 10:50:50, skipping insertion in model container [2021-12-15 10:50:50,241 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.12 10:50:50" (1/1) ... [2021-12-15 10:50:50,245 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-15 10:50:50,253 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-15 10:50:50,351 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-acceleration/phases_1-1.c[322,335] [2021-12-15 10:50:50,364 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-15 10:50:50,368 INFO L203 MainTranslator]: Completed pre-run [2021-12-15 10:50:50,376 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-acceleration/phases_1-1.c[322,335] [2021-12-15 10:50:50,380 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-15 10:50:50,389 INFO L208 MainTranslator]: Completed translation [2021-12-15 10:50:50,389 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 10:50:50 WrapperNode [2021-12-15 10:50:50,389 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-15 10:50:50,390 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-15 10:50:50,390 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-15 10:50:50,390 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-15 10:50:50,394 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 10:50:50" (1/1) ... [2021-12-15 10:50:50,399 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 10:50:50" (1/1) ... [2021-12-15 10:50:50,412 INFO L137 Inliner]: procedures = 12, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 27 [2021-12-15 10:50:50,412 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-15 10:50:50,412 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-15 10:50:50,413 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-15 10:50:50,413 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-15 10:50:50,417 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 10:50:50" (1/1) ... [2021-12-15 10:50:50,417 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 10:50:50" (1/1) ... [2021-12-15 10:50:50,418 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 10:50:50" (1/1) ... [2021-12-15 10:50:50,418 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 10:50:50" (1/1) ... [2021-12-15 10:50:50,420 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 10:50:50" (1/1) ... [2021-12-15 10:50:50,422 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 10:50:50" (1/1) ... [2021-12-15 10:50:50,422 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 10:50:50" (1/1) ... [2021-12-15 10:50:50,423 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-15 10:50:50,423 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-15 10:50:50,423 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-15 10:50:50,424 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-15 10:50:50,424 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 10:50:50" (1/1) ... [2021-12-15 10:50:50,429 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-15 10:50:50,437 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 10:50:50,446 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-15 10:50:50,457 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-15 10:50:50,469 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-15 10:50:50,469 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-15 10:50:50,470 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-15 10:50:50,470 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-15 10:50:50,506 INFO L236 CfgBuilder]: Building ICFG [2021-12-15 10:50:50,507 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-15 10:50:50,563 INFO L277 CfgBuilder]: Performing block encoding [2021-12-15 10:50:50,566 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-15 10:50:50,567 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-12-15 10:50:50,568 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.12 10:50:50 BoogieIcfgContainer [2021-12-15 10:50:50,568 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-15 10:50:50,569 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-15 10:50:50,569 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-15 10:50:50,571 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-15 10:50:50,571 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.12 10:50:50" (1/3) ... [2021-12-15 10:50:50,572 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27e8de9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.12 10:50:50, skipping insertion in model container [2021-12-15 10:50:50,572 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 10:50:50" (2/3) ... [2021-12-15 10:50:50,572 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27e8de9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.12 10:50:50, skipping insertion in model container [2021-12-15 10:50:50,572 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.12 10:50:50" (3/3) ... [2021-12-15 10:50:50,573 INFO L111 eAbstractionObserver]: Analyzing ICFG phases_1-1.c [2021-12-15 10:50:50,577 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-15 10:50:50,577 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-15 10:50:50,606 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-15 10:50:50,610 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-15 10:50:50,611 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-15 10:50:50,618 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.5) internal successors, (15), 11 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:50,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-15 10:50:50,621 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 10:50:50,622 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-15 10:50:50,622 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 10:50:50,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 10:50:50,626 INFO L85 PathProgramCache]: Analyzing trace with hash 889937703, now seen corresponding path program 1 times [2021-12-15 10:50:50,631 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 10:50:50,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477838224] [2021-12-15 10:50:50,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 10:50:50,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 10:50:50,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 10:50:50,734 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 10:50:50,734 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 10:50:50,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477838224] [2021-12-15 10:50:50,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [477838224] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-15 10:50:50,736 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-15 10:50:50,737 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-15 10:50:50,738 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741022300] [2021-12-15 10:50:50,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-15 10:50:50,742 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-15 10:50:50,743 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 10:50:50,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-15 10:50:50,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-15 10:50:50,764 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.5) internal successors, (15), 11 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:50,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 10:50:50,779 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2021-12-15 10:50:50,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-15 10:50:50,781 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-15 10:50:50,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 10:50:50,786 INFO L225 Difference]: With dead ends: 20 [2021-12-15 10:50:50,787 INFO L226 Difference]: Without dead ends: 8 [2021-12-15 10:50:50,789 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-15 10:50:50,792 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-15 10:50:50,793 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-15 10:50:50,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-12-15 10:50:50,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2021-12-15 10:50:50,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:50,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2021-12-15 10:50:50,819 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2021-12-15 10:50:50,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 10:50:50,819 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2021-12-15 10:50:50,819 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:50,820 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2021-12-15 10:50:50,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-15 10:50:50,820 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 10:50:50,820 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-15 10:50:50,820 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-15 10:50:50,821 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 10:50:50,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 10:50:50,824 INFO L85 PathProgramCache]: Analyzing trace with hash 889639793, now seen corresponding path program 1 times [2021-12-15 10:50:50,824 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 10:50:50,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1237226149] [2021-12-15 10:50:50,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 10:50:50,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 10:50:50,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 10:50:50,939 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 10:50:50,939 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 10:50:50,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1237226149] [2021-12-15 10:50:50,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1237226149] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-15 10:50:50,940 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-15 10:50:50,940 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-15 10:50:50,940 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239128838] [2021-12-15 10:50:50,940 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-15 10:50:50,941 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-15 10:50:50,941 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 10:50:50,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-15 10:50:50,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-15 10:50:50,942 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:50,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 10:50:50,959 INFO L93 Difference]: Finished difference Result 16 states and 20 transitions. [2021-12-15 10:50:50,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-15 10:50:50,976 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-15 10:50:50,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 10:50:50,976 INFO L225 Difference]: With dead ends: 16 [2021-12-15 10:50:50,976 INFO L226 Difference]: Without dead ends: 10 [2021-12-15 10:50:50,976 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-15 10:50:50,977 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 1 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-15 10:50:50,978 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 10 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-15 10:50:50,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-12-15 10:50:50,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-12-15 10:50:50,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:50,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2021-12-15 10:50:50,980 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 6 [2021-12-15 10:50:50,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 10:50:50,980 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2021-12-15 10:50:50,980 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:50,980 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2021-12-15 10:50:50,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-12-15 10:50:50,981 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 10:50:50,981 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 10:50:50,981 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-15 10:50:50,981 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 10:50:50,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 10:50:50,982 INFO L85 PathProgramCache]: Analyzing trace with hash 295691924, now seen corresponding path program 1 times [2021-12-15 10:50:50,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 10:50:50,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093821458] [2021-12-15 10:50:50,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 10:50:50,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 10:50:50,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 10:50:51,030 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 10:50:51,031 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 10:50:51,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093821458] [2021-12-15 10:50:51,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2093821458] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 10:50:51,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [9295700] [2021-12-15 10:50:51,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 10:50:51,032 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 10:50:51,032 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 10:50:51,033 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-15 10:50:51,034 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-15 10:50:51,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 10:50:51,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-15 10:50:51,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 10:50:51,099 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 10:50:51,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-15 10:50:51,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 10:50:51,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [9295700] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-15 10:50:51,133 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-15 10:50:51,133 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-12-15 10:50:51,134 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495330894] [2021-12-15 10:50:51,137 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-15 10:50:51,137 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-15 10:50:51,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 10:50:51,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-15 10:50:51,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-12-15 10:50:51,138 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:51,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 10:50:51,202 INFO L93 Difference]: Finished difference Result 20 states and 26 transitions. [2021-12-15 10:50:51,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-15 10:50:51,203 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-12-15 10:50:51,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 10:50:51,203 INFO L225 Difference]: With dead ends: 20 [2021-12-15 10:50:51,203 INFO L226 Difference]: Without dead ends: 14 [2021-12-15 10:50:51,204 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=30, Unknown=0, NotChecked=0, Total=56 [2021-12-15 10:50:51,207 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 3 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-15 10:50:51,208 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 21 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-15 10:50:51,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-12-15 10:50:51,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2021-12-15 10:50:51,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:51,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-12-15 10:50:51,216 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 8 [2021-12-15 10:50:51,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 10:50:51,216 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-12-15 10:50:51,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:51,217 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-12-15 10:50:51,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-12-15 10:50:51,217 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 10:50:51,217 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 10:50:51,257 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-15 10:50:51,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 10:50:51,432 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 10:50:51,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 10:50:51,432 INFO L85 PathProgramCache]: Analyzing trace with hash 572634524, now seen corresponding path program 1 times [2021-12-15 10:50:51,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 10:50:51,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [691683337] [2021-12-15 10:50:51,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 10:50:51,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 10:50:51,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 10:50:51,513 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 10:50:51,515 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 10:50:51,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [691683337] [2021-12-15 10:50:51,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [691683337] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 10:50:51,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [660550885] [2021-12-15 10:50:51,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 10:50:51,516 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 10:50:51,516 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 10:50:51,517 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-15 10:50:51,519 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-15 10:50:51,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 10:50:51,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-15 10:50:51,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 10:50:51,668 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 10:50:51,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-15 10:50:51,744 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-15 10:50:51,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [660550885] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-15 10:50:51,744 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-15 10:50:51,744 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 5] total 10 [2021-12-15 10:50:51,745 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117067700] [2021-12-15 10:50:51,745 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-15 10:50:51,745 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-15 10:50:51,745 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 10:50:51,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-15 10:50:51,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-12-15 10:50:51,746 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 10 states, 10 states have (on average 2.6) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:51,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 10:50:51,841 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2021-12-15 10:50:51,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-15 10:50:51,842 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-12-15 10:50:51,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 10:50:51,843 INFO L225 Difference]: With dead ends: 27 [2021-12-15 10:50:51,843 INFO L226 Difference]: Without dead ends: 18 [2021-12-15 10:50:51,845 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-12-15 10:50:51,847 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 5 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-15 10:50:51,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 23 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-15 10:50:51,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-12-15 10:50:51,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-12-15 10:50:51,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:51,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-12-15 10:50:51,857 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2021-12-15 10:50:51,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 10:50:51,858 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-12-15 10:50:51,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:51,858 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-12-15 10:50:51,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-12-15 10:50:51,858 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 10:50:51,859 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 10:50:51,880 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-15 10:50:52,075 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-12-15 10:50:52,076 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 10:50:52,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 10:50:52,076 INFO L85 PathProgramCache]: Analyzing trace with hash -1176853889, now seen corresponding path program 2 times [2021-12-15 10:50:52,076 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 10:50:52,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271486473] [2021-12-15 10:50:52,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 10:50:52,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 10:50:52,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 10:50:52,164 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 10:50:52,164 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 10:50:52,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271486473] [2021-12-15 10:50:52,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1271486473] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 10:50:52,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [966675121] [2021-12-15 10:50:52,166 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-15 10:50:52,166 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 10:50:52,166 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 10:50:52,168 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-15 10:50:52,169 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-15 10:50:52,194 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-15 10:50:52,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-15 10:50:52,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-15 10:50:52,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 10:50:52,258 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 10:50:52,259 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-15 10:50:52,326 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 10:50:52,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [966675121] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-15 10:50:52,326 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-15 10:50:52,326 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 13 [2021-12-15 10:50:52,327 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069490844] [2021-12-15 10:50:52,327 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-15 10:50:52,328 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-15 10:50:52,328 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 10:50:52,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-15 10:50:52,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=99, Unknown=0, NotChecked=0, Total=156 [2021-12-15 10:50:52,328 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:52,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 10:50:52,457 INFO L93 Difference]: Finished difference Result 37 states and 48 transitions. [2021-12-15 10:50:52,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-15 10:50:52,458 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-12-15 10:50:52,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 10:50:52,460 INFO L225 Difference]: With dead ends: 37 [2021-12-15 10:50:52,460 INFO L226 Difference]: Without dead ends: 28 [2021-12-15 10:50:52,460 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=128, Unknown=0, NotChecked=0, Total=210 [2021-12-15 10:50:52,461 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 7 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-15 10:50:52,461 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 24 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-15 10:50:52,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-12-15 10:50:52,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 23. [2021-12-15 10:50:52,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:52,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-12-15 10:50:52,464 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 14 [2021-12-15 10:50:52,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 10:50:52,464 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-12-15 10:50:52,465 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:52,465 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-12-15 10:50:52,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-12-15 10:50:52,465 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 10:50:52,465 INFO L514 BasicCegarLoop]: trace histogram [8, 5, 3, 1, 1, 1, 1, 1, 1] [2021-12-15 10:50:52,481 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-12-15 10:50:52,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 10:50:52,671 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 10:50:52,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 10:50:52,672 INFO L85 PathProgramCache]: Analyzing trace with hash -495138033, now seen corresponding path program 3 times [2021-12-15 10:50:52,672 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 10:50:52,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [374361363] [2021-12-15 10:50:52,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 10:50:52,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 10:50:52,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 10:50:52,763 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 30 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-15 10:50:52,764 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 10:50:52,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [374361363] [2021-12-15 10:50:52,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [374361363] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 10:50:52,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1603369892] [2021-12-15 10:50:52,764 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-15 10:50:52,764 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 10:50:52,765 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 10:50:52,765 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-15 10:50:52,768 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-15 10:50:52,817 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-12-15 10:50:52,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-15 10:50:52,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-15 10:50:52,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 10:50:52,909 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 35 proven. 9 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-12-15 10:50:52,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-15 10:50:53,011 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 35 proven. 9 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-12-15 10:50:53,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1603369892] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-15 10:50:53,011 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-15 10:50:53,012 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 16 [2021-12-15 10:50:53,012 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253073576] [2021-12-15 10:50:53,012 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-15 10:50:53,012 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-15 10:50:53,013 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 10:50:53,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-15 10:50:53,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2021-12-15 10:50:53,014 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 16 states, 16 states have (on average 2.4375) internal successors, (39), 16 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:53,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 10:50:53,598 INFO L93 Difference]: Finished difference Result 73 states and 104 transitions. [2021-12-15 10:50:53,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-15 10:50:53,602 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.4375) internal successors, (39), 16 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-12-15 10:50:53,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 10:50:53,603 INFO L225 Difference]: With dead ends: 73 [2021-12-15 10:50:53,603 INFO L226 Difference]: Without dead ends: 60 [2021-12-15 10:50:53,603 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=194, Invalid=358, Unknown=0, NotChecked=0, Total=552 [2021-12-15 10:50:53,604 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 17 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-15 10:50:53,604 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 18 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-15 10:50:53,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-12-15 10:50:53,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 37. [2021-12-15 10:50:53,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 36 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:53,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2021-12-15 10:50:53,608 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 22 [2021-12-15 10:50:53,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 10:50:53,609 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2021-12-15 10:50:53,609 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.4375) internal successors, (39), 16 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:53,609 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2021-12-15 10:50:53,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-12-15 10:50:53,609 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 10:50:53,610 INFO L514 BasicCegarLoop]: trace histogram [15, 8, 7, 1, 1, 1, 1, 1, 1] [2021-12-15 10:50:53,613 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-15 10:50:53,813 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 10:50:53,814 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 10:50:53,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 10:50:53,814 INFO L85 PathProgramCache]: Analyzing trace with hash 1202430414, now seen corresponding path program 4 times [2021-12-15 10:50:53,814 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 10:50:53,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610445898] [2021-12-15 10:50:53,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 10:50:53,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 10:50:53,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 10:50:53,919 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 120 proven. 56 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-12-15 10:50:53,920 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 10:50:53,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610445898] [2021-12-15 10:50:53,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610445898] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 10:50:53,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [907029088] [2021-12-15 10:50:53,920 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-15 10:50:53,920 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 10:50:53,921 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 10:50:53,921 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-15 10:50:53,923 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-15 10:50:53,951 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-15 10:50:53,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-15 10:50:53,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-15 10:50:53,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 10:50:54,043 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 120 proven. 56 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-12-15 10:50:54,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-15 10:50:54,298 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 120 proven. 56 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-12-15 10:50:54,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [907029088] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-15 10:50:54,299 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-15 10:50:54,299 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 11] total 20 [2021-12-15 10:50:54,299 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381908325] [2021-12-15 10:50:54,299 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-15 10:50:54,299 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-15 10:50:54,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 10:50:54,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-15 10:50:54,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=253, Unknown=0, NotChecked=0, Total=380 [2021-12-15 10:50:54,300 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand has 20 states, 20 states have (on average 2.2) internal successors, (44), 20 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:55,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 10:50:55,917 INFO L93 Difference]: Finished difference Result 80 states and 108 transitions. [2021-12-15 10:50:55,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-15 10:50:55,928 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.2) internal successors, (44), 20 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-12-15 10:50:55,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 10:50:55,930 INFO L225 Difference]: With dead ends: 80 [2021-12-15 10:50:55,930 INFO L226 Difference]: Without dead ends: 57 [2021-12-15 10:50:55,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=287, Invalid=469, Unknown=0, NotChecked=0, Total=756 [2021-12-15 10:50:55,932 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 40 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-15 10:50:55,932 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 22 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-15 10:50:55,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-12-15 10:50:55,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-12-15 10:50:55,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.1785714285714286) internal successors, (66), 56 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:55,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 66 transitions. [2021-12-15 10:50:55,945 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 66 transitions. Word has length 36 [2021-12-15 10:50:55,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 10:50:55,945 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 66 transitions. [2021-12-15 10:50:55,946 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.2) internal successors, (44), 20 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 10:50:55,947 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 66 transitions. [2021-12-15 10:50:55,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-12-15 10:50:55,949 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 10:50:55,950 INFO L514 BasicCegarLoop]: trace histogram [25, 17, 8, 1, 1, 1, 1, 1, 1] [2021-12-15 10:50:55,967 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-15 10:50:56,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 10:50:56,163 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 10:50:56,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 10:50:56,164 INFO L85 PathProgramCache]: Analyzing trace with hash -1703277844, now seen corresponding path program 5 times [2021-12-15 10:50:56,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 10:50:56,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004830650] [2021-12-15 10:50:56,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 10:50:56,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 10:50:56,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 10:50:56,430 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 270 proven. 306 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-12-15 10:50:56,430 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 10:50:56,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004830650] [2021-12-15 10:50:56,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2004830650] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-15 10:50:56,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538222193] [2021-12-15 10:50:56,430 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-15 10:50:56,430 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-15 10:50:56,431 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 10:50:56,432 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-15 10:50:56,433 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-15 10:50:56,805 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 26 check-sat command(s) [2021-12-15 10:50:56,806 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-15 10:50:56,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 48 conjunts are in the unsatisfiable core [2021-12-15 10:50:56,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-15 10:50:57,096 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 115 proven. 506 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-15 10:50:57,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-15 10:50:58,299 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 115 proven. 506 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-15 10:50:58,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538222193] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-15 10:50:58,299 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-15 10:50:58,299 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 25, 26] total 50 [2021-12-15 10:50:58,299 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502816880] [2021-12-15 10:50:58,300 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-15 10:50:58,300 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-12-15 10:50:58,300 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 10:50:58,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-12-15 10:50:58,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=692, Invalid=1758, Unknown=0, NotChecked=0, Total=2450 [2021-12-15 10:50:58,301 INFO L87 Difference]: Start difference. First operand 57 states and 66 transitions. Second operand has 50 states, 50 states have (on average 2.08) internal successors, (104), 50 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)