./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/Ackermann01-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/recursive/Ackermann01-2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer --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 7cce1369ae77ba12caf55c599bb062630d3f3fd2 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-30 00:42:48,464 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-30 00:42:48,468 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-30 00:42:48,529 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-30 00:42:48,550 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-30 00:42:48,551 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-30 00:42:48,553 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-30 00:42:48,556 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-30 00:42:48,559 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-30 00:42:48,568 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-30 00:42:48,569 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-30 00:42:48,570 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-30 00:42:48,571 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-30 00:42:48,573 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-30 00:42:48,574 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-30 00:42:48,580 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-30 00:42:48,582 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-30 00:42:48,588 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-30 00:42:48,594 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-30 00:42:48,604 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-30 00:42:48,609 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-30 00:42:48,611 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-30 00:42:48,614 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-30 00:42:48,616 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-30 00:42:48,626 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-30 00:42:48,627 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-30 00:42:48,627 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-30 00:42:48,630 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-30 00:42:48,631 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-30 00:42:48,632 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-30 00:42:48,633 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-30 00:42:48,635 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-30 00:42:48,637 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-30 00:42:48,639 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-30 00:42:48,641 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-30 00:42:48,641 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-30 00:42:48,642 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-30 00:42:48,643 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-30 00:42:48,643 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-30 00:42:48,646 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-30 00:42:48,647 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-30 00:42:48,651 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-30 00:42:48,706 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-30 00:42:48,708 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-30 00:42:48,712 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-30 00:42:48,712 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-30 00:42:48,713 INFO L138 SettingsManager]: * Use SBE=true [2020-11-30 00:42:48,713 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-30 00:42:48,713 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-30 00:42:48,714 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-30 00:42:48,714 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-30 00:42:48,714 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-30 00:42:48,715 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-30 00:42:48,716 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-30 00:42:48,716 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-30 00:42:48,716 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-30 00:42:48,717 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-30 00:42:48,717 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-30 00:42:48,717 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-30 00:42:48,717 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-30 00:42:48,718 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-30 00:42:48,718 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-30 00:42:48,718 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-30 00:42:48,719 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 00:42:48,719 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-30 00:42:48,719 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-30 00:42:48,719 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-30 00:42:48,720 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-30 00:42:48,720 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-30 00:42:48,720 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-30 00:42:48,721 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-30 00:42:48,721 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:/tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7cce1369ae77ba12caf55c599bb062630d3f3fd2 [2020-11-30 00:42:49,142 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-30 00:42:49,187 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-30 00:42:49,191 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-30 00:42:49,192 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-30 00:42:49,194 INFO L275 PluginConnector]: CDTParser initialized [2020-11-30 00:42:49,195 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/../../sv-benchmarks/c/recursive/Ackermann01-2.c [2020-11-30 00:42:49,303 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/data/541602f40/4a26588277464d72bb96b1042e54de23/FLAG7e9f3c00d [2020-11-30 00:42:49,984 INFO L306 CDTParser]: Found 1 translation units. [2020-11-30 00:42:49,984 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/sv-benchmarks/c/recursive/Ackermann01-2.c [2020-11-30 00:42:49,998 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/data/541602f40/4a26588277464d72bb96b1042e54de23/FLAG7e9f3c00d [2020-11-30 00:42:50,356 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/data/541602f40/4a26588277464d72bb96b1042e54de23 [2020-11-30 00:42:50,360 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-30 00:42:50,368 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-30 00:42:50,373 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-30 00:42:50,374 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-30 00:42:50,377 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-30 00:42:50,379 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 12:42:50" (1/1) ... [2020-11-30 00:42:50,381 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@245f289f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:42:50, skipping insertion in model container [2020-11-30 00:42:50,382 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 12:42:50" (1/1) ... [2020-11-30 00:42:50,392 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-30 00:42:50,412 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-30 00:42:50,653 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 00:42:50,664 INFO L203 MainTranslator]: Completed pre-run [2020-11-30 00:42:50,685 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 00:42:50,703 INFO L208 MainTranslator]: Completed translation [2020-11-30 00:42:50,704 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:42:50 WrapperNode [2020-11-30 00:42:50,704 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-30 00:42:50,706 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-30 00:42:50,706 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-30 00:42:50,706 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-30 00:42:50,717 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:42:50" (1/1) ... [2020-11-30 00:42:50,725 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:42:50" (1/1) ... [2020-11-30 00:42:50,747 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-30 00:42:50,749 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-30 00:42:50,749 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-30 00:42:50,750 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-30 00:42:50,760 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:42:50" (1/1) ... [2020-11-30 00:42:50,761 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:42:50" (1/1) ... [2020-11-30 00:42:50,774 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:42:50" (1/1) ... [2020-11-30 00:42:50,774 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:42:50" (1/1) ... [2020-11-30 00:42:50,778 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:42:50" (1/1) ... [2020-11-30 00:42:50,781 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:42:50" (1/1) ... [2020-11-30 00:42:50,783 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:42:50" (1/1) ... [2020-11-30 00:42:50,785 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-30 00:42:50,786 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-30 00:42:50,786 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-30 00:42:50,787 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-30 00:42:50,795 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:42:50" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 00:42:50,892 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-30 00:42:50,892 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-30 00:42:50,892 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-11-30 00:42:50,893 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-11-30 00:42:50,893 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-30 00:42:50,894 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-30 00:42:51,294 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-30 00:42:51,295 INFO L298 CfgBuilder]: Removed 6 assume(true) statements. [2020-11-30 00:42:51,297 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 12:42:51 BoogieIcfgContainer [2020-11-30 00:42:51,297 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-30 00:42:51,299 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-30 00:42:51,299 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-30 00:42:51,319 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-30 00:42:51,320 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.11 12:42:50" (1/3) ... [2020-11-30 00:42:51,321 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@715a8bc6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 12:42:51, skipping insertion in model container [2020-11-30 00:42:51,321 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:42:50" (2/3) ... [2020-11-30 00:42:51,321 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@715a8bc6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 12:42:51, skipping insertion in model container [2020-11-30 00:42:51,321 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 12:42:51" (3/3) ... [2020-11-30 00:42:51,323 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann01-2.c [2020-11-30 00:42:51,337 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-30 00:42:51,341 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-30 00:42:51,356 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-30 00:42:51,404 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-30 00:42:51,404 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-30 00:42:51,404 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-30 00:42:51,404 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-30 00:42:51,405 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-30 00:42:51,405 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-30 00:42:51,405 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-30 00:42:51,405 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-30 00:42:51,438 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-11-30 00:42:51,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-11-30 00:42:51,446 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 00:42:51,447 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 00:42:51,448 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 00:42:51,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:42:51,466 INFO L82 PathProgramCache]: Analyzing trace with hash -1799437593, now seen corresponding path program 1 times [2020-11-30 00:42:51,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:42:51,479 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042232958] [2020-11-30 00:42:51,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:42:51,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:51,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-30 00:42:51,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:51,956 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 00:42:51,957 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042232958] [2020-11-30 00:42:51,958 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 00:42:51,959 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-11-30 00:42:51,960 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698967123] [2020-11-30 00:42:51,966 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-30 00:42:51,967 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-30 00:42:51,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-30 00:42:51,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-11-30 00:42:51,995 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 7 states. [2020-11-30 00:42:52,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 00:42:52,284 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-11-30 00:42:52,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-30 00:42:52,287 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2020-11-30 00:42:52,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 00:42:52,306 INFO L225 Difference]: With dead ends: 39 [2020-11-30 00:42:52,308 INFO L226 Difference]: Without dead ends: 22 [2020-11-30 00:42:52,315 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-11-30 00:42:52,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-11-30 00:42:52,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-11-30 00:42:52,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-11-30 00:42:52,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2020-11-30 00:42:52,379 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 12 [2020-11-30 00:42:52,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 00:42:52,379 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2020-11-30 00:42:52,380 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-30 00:42:52,380 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2020-11-30 00:42:52,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-11-30 00:42:52,384 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 00:42:52,384 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 00:42:52,385 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-30 00:42:52,386 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 00:42:52,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:42:52,387 INFO L82 PathProgramCache]: Analyzing trace with hash 335222435, now seen corresponding path program 1 times [2020-11-30 00:42:52,387 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:42:52,388 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [564684999] [2020-11-30 00:42:52,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:42:52,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:52,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-30 00:42:52,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:52,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-30 00:42:52,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:52,675 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-30 00:42:52,676 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [564684999] [2020-11-30 00:42:52,676 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 00:42:52,676 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-11-30 00:42:52,677 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768793069] [2020-11-30 00:42:52,678 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-30 00:42:52,679 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-30 00:42:52,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-30 00:42:52,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-11-30 00:42:52,681 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand 8 states. [2020-11-30 00:42:52,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 00:42:52,986 INFO L93 Difference]: Finished difference Result 29 states and 37 transitions. [2020-11-30 00:42:52,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-30 00:42:52,987 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2020-11-30 00:42:52,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 00:42:52,989 INFO L225 Difference]: With dead ends: 29 [2020-11-30 00:42:52,989 INFO L226 Difference]: Without dead ends: 25 [2020-11-30 00:42:52,991 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2020-11-30 00:42:52,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-11-30 00:42:52,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2020-11-30 00:42:52,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-11-30 00:42:53,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 29 transitions. [2020-11-30 00:42:53,000 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 29 transitions. Word has length 19 [2020-11-30 00:42:53,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 00:42:53,001 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 29 transitions. [2020-11-30 00:42:53,001 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-30 00:42:53,001 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 29 transitions. [2020-11-30 00:42:53,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-11-30 00:42:53,003 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 00:42:53,003 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 00:42:53,003 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-30 00:42:53,004 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 00:42:53,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:42:53,004 INFO L82 PathProgramCache]: Analyzing trace with hash 850378260, now seen corresponding path program 1 times [2020-11-30 00:42:53,005 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:42:53,005 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768302622] [2020-11-30 00:42:53,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:42:53,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:53,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-30 00:42:53,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:53,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-30 00:42:53,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:53,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-11-30 00:42:53,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:53,137 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-30 00:42:53,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768302622] [2020-11-30 00:42:53,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [705758120] [2020-11-30 00:42:53,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 00:42:53,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:53,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-30 00:42:53,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 00:42:53,436 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-11-30 00:42:53,437 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-30 00:42:53,437 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 10 [2020-11-30 00:42:53,438 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453564836] [2020-11-30 00:42:53,438 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-30 00:42:53,439 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-30 00:42:53,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-30 00:42:53,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-11-30 00:42:53,440 INFO L87 Difference]: Start difference. First operand 23 states and 29 transitions. Second operand 10 states. [2020-11-30 00:42:53,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 00:42:53,747 INFO L93 Difference]: Finished difference Result 48 states and 75 transitions. [2020-11-30 00:42:53,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-30 00:42:53,753 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2020-11-30 00:42:53,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 00:42:53,756 INFO L225 Difference]: With dead ends: 48 [2020-11-30 00:42:53,756 INFO L226 Difference]: Without dead ends: 30 [2020-11-30 00:42:53,758 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2020-11-30 00:42:53,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-11-30 00:42:53,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-11-30 00:42:53,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-11-30 00:42:53,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2020-11-30 00:42:53,777 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 25 [2020-11-30 00:42:53,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 00:42:53,779 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2020-11-30 00:42:53,779 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-30 00:42:53,779 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2020-11-30 00:42:53,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-11-30 00:42:53,787 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 00:42:53,787 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 00:42:54,009 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-30 00:42:54,010 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 00:42:54,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:42:54,011 INFO L82 PathProgramCache]: Analyzing trace with hash -1209780356, now seen corresponding path program 1 times [2020-11-30 00:42:54,011 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:42:54,011 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942459332] [2020-11-30 00:42:54,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:42:54,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:54,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-30 00:42:54,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:54,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-30 00:42:54,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:54,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-30 00:42:54,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:54,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-11-30 00:42:54,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:54,412 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-11-30 00:42:54,414 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942459332] [2020-11-30 00:42:54,415 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460245538] [2020-11-30 00:42:54,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 00:42:54,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:54,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 14 conjunts are in the unsatisfiable core [2020-11-30 00:42:54,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 00:42:54,605 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-30 00:42:54,607 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-30 00:42:54,608 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 14 [2020-11-30 00:42:54,608 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541773686] [2020-11-30 00:42:54,609 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-11-30 00:42:54,609 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-30 00:42:54,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-11-30 00:42:54,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2020-11-30 00:42:54,611 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand 14 states. [2020-11-30 00:42:55,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 00:42:55,426 INFO L93 Difference]: Finished difference Result 51 states and 84 transitions. [2020-11-30 00:42:55,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-11-30 00:42:55,427 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-11-30 00:42:55,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 00:42:55,431 INFO L225 Difference]: With dead ends: 51 [2020-11-30 00:42:55,432 INFO L226 Difference]: Without dead ends: 47 [2020-11-30 00:42:55,433 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=124, Invalid=476, Unknown=0, NotChecked=0, Total=600 [2020-11-30 00:42:55,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-11-30 00:42:55,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 33. [2020-11-30 00:42:55,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-11-30 00:42:55,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 50 transitions. [2020-11-30 00:42:55,458 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 50 transitions. Word has length 32 [2020-11-30 00:42:55,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 00:42:55,458 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 50 transitions. [2020-11-30 00:42:55,458 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-11-30 00:42:55,459 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 50 transitions. [2020-11-30 00:42:55,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-11-30 00:42:55,461 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 00:42:55,461 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 00:42:55,676 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 00:42:55,677 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 00:42:55,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:42:55,678 INFO L82 PathProgramCache]: Analyzing trace with hash -720833458, now seen corresponding path program 2 times [2020-11-30 00:42:55,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:42:55,678 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1883254473] [2020-11-30 00:42:55,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:42:55,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:55,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-30 00:42:55,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:55,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-30 00:42:55,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:55,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-30 00:42:55,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:55,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-11-30 00:42:55,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:55,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-30 00:42:55,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:55,879 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-11-30 00:42:55,880 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1883254473] [2020-11-30 00:42:55,880 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [696645675] [2020-11-30 00:42:55,880 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 00:42:55,961 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-30 00:42:55,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 00:42:55,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 9 conjunts are in the unsatisfiable core [2020-11-30 00:42:55,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 00:42:56,150 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 17 proven. 13 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-11-30 00:42:56,150 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-30 00:42:56,150 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 13 [2020-11-30 00:42:56,151 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746945974] [2020-11-30 00:42:56,151 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-30 00:42:56,152 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-30 00:42:56,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-30 00:42:56,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-11-30 00:42:56,153 INFO L87 Difference]: Start difference. First operand 33 states and 50 transitions. Second operand 13 states. [2020-11-30 00:42:56,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 00:42:56,811 INFO L93 Difference]: Finished difference Result 78 states and 155 transitions. [2020-11-30 00:42:56,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-11-30 00:42:56,816 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 39 [2020-11-30 00:42:56,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 00:42:56,818 INFO L225 Difference]: With dead ends: 78 [2020-11-30 00:42:56,818 INFO L226 Difference]: Without dead ends: 50 [2020-11-30 00:42:56,825 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=116, Invalid=390, Unknown=0, NotChecked=0, Total=506 [2020-11-30 00:42:56,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-11-30 00:42:56,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-11-30 00:42:56,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-11-30 00:42:56,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 74 transitions. [2020-11-30 00:42:56,836 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 74 transitions. Word has length 39 [2020-11-30 00:42:56,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 00:42:56,841 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 74 transitions. [2020-11-30 00:42:56,841 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-30 00:42:56,841 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 74 transitions. [2020-11-30 00:42:56,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-11-30 00:42:56,843 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 00:42:56,843 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 00:42:57,047 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 00:42:57,047 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 00:42:57,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:42:57,048 INFO L82 PathProgramCache]: Analyzing trace with hash 1845686382, now seen corresponding path program 3 times [2020-11-30 00:42:57,048 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:42:57,049 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1046562926] [2020-11-30 00:42:57,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:42:57,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:57,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-30 00:42:57,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:57,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-30 00:42:57,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:57,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-30 00:42:57,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:57,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-30 00:42:57,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:57,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-11-30 00:42:57,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:57,407 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-11-30 00:42:57,408 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1046562926] [2020-11-30 00:42:57,409 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242338221] [2020-11-30 00:42:57,409 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 00:42:57,511 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-30 00:42:57,511 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 00:42:57,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-30 00:42:57,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 00:42:57,607 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 11 proven. 12 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2020-11-30 00:42:57,607 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-30 00:42:57,607 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 15 [2020-11-30 00:42:57,608 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601371751] [2020-11-30 00:42:57,608 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-11-30 00:42:57,608 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-30 00:42:57,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-11-30 00:42:57,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=176, Unknown=0, NotChecked=0, Total=210 [2020-11-30 00:42:57,610 INFO L87 Difference]: Start difference. First operand 47 states and 74 transitions. Second operand 15 states. [2020-11-30 00:42:58,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 00:42:58,334 INFO L93 Difference]: Finished difference Result 94 states and 191 transitions. [2020-11-30 00:42:58,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-11-30 00:42:58,338 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 39 [2020-11-30 00:42:58,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 00:42:58,343 INFO L225 Difference]: With dead ends: 94 [2020-11-30 00:42:58,343 INFO L226 Difference]: Without dead ends: 90 [2020-11-30 00:42:58,345 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-11-30 00:42:58,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-11-30 00:42:58,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 47. [2020-11-30 00:42:58,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-11-30 00:42:58,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 73 transitions. [2020-11-30 00:42:58,415 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 73 transitions. Word has length 39 [2020-11-30 00:42:58,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 00:42:58,417 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 73 transitions. [2020-11-30 00:42:58,417 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-11-30 00:42:58,419 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 73 transitions. [2020-11-30 00:42:58,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-11-30 00:42:58,425 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 00:42:58,426 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 00:42:58,647 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 00:42:58,648 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 00:42:58,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:42:58,648 INFO L82 PathProgramCache]: Analyzing trace with hash -1271175911, now seen corresponding path program 4 times [2020-11-30 00:42:58,648 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:42:58,649 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160805721] [2020-11-30 00:42:58,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:42:58,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:58,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-30 00:42:58,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:58,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-30 00:42:58,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:58,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-30 00:42:58,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:58,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-30 00:42:58,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:58,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-30 00:42:58,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:58,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-11-30 00:42:58,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:59,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2020-11-30 00:42:59,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:59,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-30 00:42:59,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:42:59,093 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 54 proven. 29 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-11-30 00:42:59,094 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160805721] [2020-11-30 00:42:59,094 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [782583178] [2020-11-30 00:42:59,094 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 00:42:59,176 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-30 00:42:59,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 00:42:59,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-30 00:42:59,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 00:42:59,310 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 40 proven. 4 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-11-30 00:42:59,310 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-30 00:42:59,310 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 9] total 20 [2020-11-30 00:42:59,311 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400455938] [2020-11-30 00:42:59,312 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-11-30 00:42:59,312 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-30 00:42:59,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-11-30 00:42:59,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=331, Unknown=0, NotChecked=0, Total=380 [2020-11-30 00:42:59,313 INFO L87 Difference]: Start difference. First operand 47 states and 73 transitions. Second operand 20 states. [2020-11-30 00:43:00,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 00:43:00,289 INFO L93 Difference]: Finished difference Result 92 states and 181 transitions. [2020-11-30 00:43:00,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-11-30 00:43:00,292 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 59 [2020-11-30 00:43:00,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 00:43:00,293 INFO L225 Difference]: With dead ends: 92 [2020-11-30 00:43:00,293 INFO L226 Difference]: Without dead ends: 0 [2020-11-30 00:43:00,300 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=258, Invalid=1148, Unknown=0, NotChecked=0, Total=1406 [2020-11-30 00:43:00,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-30 00:43:00,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-30 00:43:00,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-30 00:43:00,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-30 00:43:00,302 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 59 [2020-11-30 00:43:00,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 00:43:00,302 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-30 00:43:00,302 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-11-30 00:43:00,302 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-30 00:43:00,302 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-30 00:43:00,511 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-11-30 00:43:00,514 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-11-30 00:43:01,218 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 25 [2020-11-30 00:43:01,349 INFO L274 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-11-30 00:43:01,349 INFO L274 CegarLoopResult]: For program point L46(line 46) no Hoare annotation was computed. [2020-11-30 00:43:01,349 INFO L270 CegarLoopResult]: At program point L42(line 42) the Hoare annotation is: (<= 0 ULTIMATE.start_main_~n~0) [2020-11-30 00:43:01,349 INFO L274 CegarLoopResult]: For program point L42-1(line 42) no Hoare annotation was computed. [2020-11-30 00:43:01,350 INFO L274 CegarLoopResult]: For program point L36(lines 36 41) no Hoare annotation was computed. [2020-11-30 00:43:01,350 INFO L274 CegarLoopResult]: For program point L3(line 3) no Hoare annotation was computed. [2020-11-30 00:43:01,350 INFO L274 CegarLoopResult]: For program point L-1(line -1) no Hoare annotation was computed. [2020-11-30 00:43:01,350 INFO L274 CegarLoopResult]: For program point L30(lines 30 34) no Hoare annotation was computed. [2020-11-30 00:43:01,350 INFO L274 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-11-30 00:43:01,350 INFO L274 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-11-30 00:43:01,350 INFO L277 CegarLoopResult]: At program point L28(lines 28 48) the Hoare annotation is: true [2020-11-30 00:43:01,350 INFO L274 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 3) no Hoare annotation was computed. [2020-11-30 00:43:01,350 INFO L274 CegarLoopResult]: For program point L43(lines 43 47) no Hoare annotation was computed. [2020-11-30 00:43:01,350 INFO L274 CegarLoopResult]: For program point ackermannEXIT(lines 17 25) no Hoare annotation was computed. [2020-11-30 00:43:01,351 INFO L270 CegarLoopResult]: At program point L24(line 24) the Hoare annotation is: (and (not (= ackermann_~m 0)) (= ackermann_~m |ackermann_#in~m|) (= ackermann_~n |ackermann_#in~n|)) [2020-11-30 00:43:01,351 INFO L274 CegarLoopResult]: For program point L24-1(line 24) no Hoare annotation was computed. [2020-11-30 00:43:01,351 INFO L270 CegarLoopResult]: At program point L22(line 22) the Hoare annotation is: (and (= |ackermann_#in~n| 0) (not (= ackermann_~m 0)) (= ackermann_~m |ackermann_#in~m|) (= ackermann_~n |ackermann_#in~n|)) [2020-11-30 00:43:01,351 INFO L270 CegarLoopResult]: At program point L24-2(line 24) the Hoare annotation is: (let ((.cse0 (<= 3 |ackermann_#t~ret8|))) (and (or (= |ackermann_#in~n| 1) (and (<= 2 |ackermann_#res|) (<= (+ |ackermann_#in~n| 1) |ackermann_#res|)) .cse0) (let ((.cse2 (<= 1 |ackermann_#in~m|)) (.cse3 (= ackermann_~m |ackermann_#in~m|)) (.cse1 (= ackermann_~n |ackermann_#in~n|))) (or (and (<= 2 |ackermann_#t~ret8|) (<= ackermann_~m 1) .cse1 .cse2 .cse3) (and .cse0 .cse2 .cse3 .cse1))))) [2020-11-30 00:43:01,351 INFO L277 CegarLoopResult]: At program point ackermannENTRY(lines 17 25) the Hoare annotation is: true [2020-11-30 00:43:01,351 INFO L274 CegarLoopResult]: For program point L21(lines 21 23) no Hoare annotation was computed. [2020-11-30 00:43:01,351 INFO L274 CegarLoopResult]: For program point L22-1(line 22) no Hoare annotation was computed. [2020-11-30 00:43:01,351 INFO L274 CegarLoopResult]: For program point L24-3(line 24) no Hoare annotation was computed. [2020-11-30 00:43:01,352 INFO L274 CegarLoopResult]: For program point L18(lines 18 20) no Hoare annotation was computed. [2020-11-30 00:43:01,352 INFO L274 CegarLoopResult]: For program point ackermannFINAL(lines 17 25) no Hoare annotation was computed. [2020-11-30 00:43:01,362 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 30.11 12:43:01 BoogieIcfgContainer [2020-11-30 00:43:01,362 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-30 00:43:01,363 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-30 00:43:01,363 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-30 00:43:01,363 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-30 00:43:01,364 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 12:42:51" (3/4) ... [2020-11-30 00:43:01,368 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-30 00:43:01,375 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ackermann [2020-11-30 00:43:01,379 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2020-11-30 00:43:01,380 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2020-11-30 00:43:01,380 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-30 00:43:01,380 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-30 00:43:01,438 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_9d800547-5444-45fa-bfcb-6f6eaf6e10ad/bin/uautomizer/witness.graphml [2020-11-30 00:43:01,439 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-30 00:43:01,440 INFO L168 Benchmark]: Toolchain (without parser) took 11071.52 ms. Allocated memory was 96.5 MB in the beginning and 163.6 MB in the end (delta: 67.1 MB). Free memory was 64.8 MB in the beginning and 140.5 MB in the end (delta: -75.8 MB). Peak memory consumption was 85.0 MB. Max. memory is 16.1 GB. [2020-11-30 00:43:01,441 INFO L168 Benchmark]: CDTParser took 0.38 ms. Allocated memory is still 69.2 MB. Free memory was 31.2 MB in the beginning and 31.1 MB in the end (delta: 33.6 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 00:43:01,441 INFO L168 Benchmark]: CACSL2BoogieTranslator took 331.59 ms. Allocated memory is still 96.5 MB. Free memory was 64.6 MB in the beginning and 74.3 MB in the end (delta: -9.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-30 00:43:01,442 INFO L168 Benchmark]: Boogie Procedure Inliner took 40.99 ms. Allocated memory is still 96.5 MB. Free memory was 74.3 MB in the beginning and 72.8 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 00:43:01,443 INFO L168 Benchmark]: Boogie Preprocessor took 36.60 ms. Allocated memory is still 96.5 MB. Free memory was 72.8 MB in the beginning and 71.8 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 00:43:01,443 INFO L168 Benchmark]: RCFGBuilder took 511.35 ms. Allocated memory is still 96.5 MB. Free memory was 71.8 MB in the beginning and 59.2 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-30 00:43:01,444 INFO L168 Benchmark]: TraceAbstraction took 10062.90 ms. Allocated memory was 96.5 MB in the beginning and 163.6 MB in the end (delta: 67.1 MB). Free memory was 58.7 MB in the beginning and 50.3 MB in the end (delta: 8.4 MB). Peak memory consumption was 80.7 MB. Max. memory is 16.1 GB. [2020-11-30 00:43:01,445 INFO L168 Benchmark]: Witness Printer took 76.04 ms. Allocated memory is still 163.6 MB. Free memory was 50.3 MB in the beginning and 140.5 MB in the end (delta: -90.2 MB). Peak memory consumption was 3.1 MB. Max. memory is 16.1 GB. [2020-11-30 00:43:01,448 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.38 ms. Allocated memory is still 69.2 MB. Free memory was 31.2 MB in the beginning and 31.1 MB in the end (delta: 33.6 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 331.59 ms. Allocated memory is still 96.5 MB. Free memory was 64.6 MB in the beginning and 74.3 MB in the end (delta: -9.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 40.99 ms. Allocated memory is still 96.5 MB. Free memory was 74.3 MB in the beginning and 72.8 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 36.60 ms. Allocated memory is still 96.5 MB. Free memory was 72.8 MB in the beginning and 71.8 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 511.35 ms. Allocated memory is still 96.5 MB. Free memory was 71.8 MB in the beginning and 59.2 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 10062.90 ms. Allocated memory was 96.5 MB in the beginning and 163.6 MB in the end (delta: 67.1 MB). Free memory was 58.7 MB in the beginning and 50.3 MB in the end (delta: 8.4 MB). Peak memory consumption was 80.7 MB. Max. memory is 16.1 GB. * Witness Printer took 76.04 ms. Allocated memory is still 163.6 MB. Free memory was 50.3 MB in the beginning and 140.5 MB in the end (delta: -90.2 MB). Peak memory consumption was 3.1 MB. Max. memory is 16.1 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: 28]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 9.1s, OverallIterations: 7, TraceHistogramMax: 8, AutomataDifference: 4.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.8s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 133 SDtfs, 218 SDslu, 657 SDs, 0 SdLazy, 1493 SolverSat, 328 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 381 GetRequests, 247 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 2.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=47occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 7 MinimizatonAttempts, 67 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 6 LocationsWithAnnotation, 98 PreInvPairs, 131 NumberOfFragments, 77 HoareAnnotationTreeSize, 98 FomulaSimplifications, 11396 FormulaSimplificationTreeSizeReduction, 0.4s HoareSimplificationTime, 6 FomulaSimplificationsInter, 507 FormulaSimplificationTreeSizeReductionInter, 0.3s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.6s InterpolantComputationTime, 419 NumberOfCodeBlocks, 411 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 407 ConstructedInterpolants, 0 QuantifiedInterpolants, 32497 SizeOfPredicates, 16 NumberOfNonLiveVariables, 703 ConjunctsInSsa, 55 ConjunctsInUnsatCore, 12 InterpolantComputations, 2 PerfectInterpolantSequences, 431/522 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...