./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/string-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2021-10-11 02:28:53,191 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-11 02:28:53,193 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-11 02:28:53,222 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-11 02:28:53,222 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-11 02:28:53,224 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-11 02:28:53,225 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-11 02:28:53,228 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-11 02:28:53,230 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-11 02:28:53,231 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-11 02:28:53,232 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-11 02:28:53,234 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-11 02:28:53,235 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-11 02:28:53,236 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-11 02:28:53,237 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-11 02:28:53,239 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-11 02:28:53,240 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-11 02:28:53,241 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-11 02:28:53,243 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-11 02:28:53,245 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-11 02:28:53,247 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-11 02:28:53,249 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-11 02:28:53,251 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-11 02:28:53,252 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-11 02:28:53,255 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-11 02:28:53,256 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-11 02:28:53,256 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-11 02:28:53,257 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-11 02:28:53,258 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-11 02:28:53,259 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-11 02:28:53,259 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-11 02:28:53,260 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-11 02:28:53,261 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-11 02:28:53,262 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-11 02:28:53,269 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-11 02:28:53,270 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-11 02:28:53,271 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-11 02:28:53,271 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-11 02:28:53,271 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-11 02:28:53,272 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-11 02:28:53,273 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-11 02:28:53,275 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-11 02:28:53,323 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-11 02:28:53,323 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-11 02:28:53,324 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-11 02:28:53,325 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-11 02:28:53,325 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-11 02:28:53,325 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-11 02:28:53,325 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-11 02:28:53,325 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-11 02:28:53,331 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-11 02:28:53,332 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-11 02:28:53,333 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-11 02:28:53,333 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-11 02:28:53,333 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-11 02:28:53,333 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-11 02:28:53,334 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-11 02:28:53,334 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-11 02:28:53,334 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-11 02:28:53,335 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-11 02:28:53,335 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-11 02:28:53,335 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-11 02:28:53,335 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-11 02:28:53,335 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-11 02:28:53,336 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-11 02:28:53,336 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-11 02:28:53,336 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-11 02:28:53,336 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-11 02:28:53,336 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-11 02:28:53,336 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-11 02:28:53,337 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-11 02:28:53,338 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-11 02:28:53,338 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-11 02:28:53,339 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-11 02:28:53,339 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-11 02:28:53,339 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-11 02:28:53,339 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-11 02:28:53,339 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-11 02:28:53,340 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-11 02:28:53,340 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-11 02:28:53,340 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-11 02:28:53,340 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 [2021-10-11 02:28:53,613 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-11 02:28:53,637 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-11 02:28:53,639 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-11 02:28:53,641 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-11 02:28:53,642 INFO L275 PluginConnector]: CDTParser initialized [2021-10-11 02:28:53,643 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/../../sv-benchmarks/c/loops/string-2.i [2021-10-11 02:28:53,711 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/data/2d38cabc4/70ce98c6ff1a4159a3a0c896f06d3492/FLAGcfec55f98 [2021-10-11 02:28:54,164 INFO L306 CDTParser]: Found 1 translation units. [2021-10-11 02:28:54,164 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/sv-benchmarks/c/loops/string-2.i [2021-10-11 02:28:54,172 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/data/2d38cabc4/70ce98c6ff1a4159a3a0c896f06d3492/FLAGcfec55f98 [2021-10-11 02:28:54,557 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/data/2d38cabc4/70ce98c6ff1a4159a3a0c896f06d3492 [2021-10-11 02:28:54,559 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-11 02:28:54,561 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-11 02:28:54,562 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-11 02:28:54,563 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-11 02:28:54,566 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-11 02:28:54,567 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 02:28:54" (1/1) ... [2021-10-11 02:28:54,568 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@46d546ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:28:54, skipping insertion in model container [2021-10-11 02:28:54,569 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 02:28:54" (1/1) ... [2021-10-11 02:28:54,576 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-11 02:28:54,593 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-11 02:28:54,825 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/sv-benchmarks/c/loops/string-2.i[896,909] [2021-10-11 02:28:54,846 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-11 02:28:54,855 INFO L203 MainTranslator]: Completed pre-run [2021-10-11 02:28:54,868 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/sv-benchmarks/c/loops/string-2.i[896,909] [2021-10-11 02:28:54,878 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-11 02:28:54,893 INFO L208 MainTranslator]: Completed translation [2021-10-11 02:28:54,894 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:28:54 WrapperNode [2021-10-11 02:28:54,894 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-11 02:28:54,895 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-11 02:28:54,895 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-11 02:28:54,896 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-11 02:28:54,904 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:28:54" (1/1) ... [2021-10-11 02:28:54,912 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:28:54" (1/1) ... [2021-10-11 02:28:54,935 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-11 02:28:54,936 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-11 02:28:54,936 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-11 02:28:54,936 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-11 02:28:54,943 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:28:54" (1/1) ... [2021-10-11 02:28:54,944 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:28:54" (1/1) ... [2021-10-11 02:28:54,946 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:28:54" (1/1) ... [2021-10-11 02:28:54,946 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:28:54" (1/1) ... [2021-10-11 02:28:54,953 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:28:54" (1/1) ... [2021-10-11 02:28:54,959 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:28:54" (1/1) ... [2021-10-11 02:28:54,961 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:28:54" (1/1) ... [2021-10-11 02:28:54,963 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-11 02:28:54,964 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-11 02:28:54,965 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-11 02:28:54,965 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-11 02:28:54,966 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:28:54" (1/1) ... No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-11 02:28:55,057 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-11 02:28:55,057 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-11 02:28:55,058 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-11 02:28:55,058 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-11 02:28:55,058 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-11 02:28:55,058 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-11 02:28:55,058 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-11 02:28:55,621 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-11 02:28:55,622 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2021-10-11 02:28:55,624 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:28:55 BoogieIcfgContainer [2021-10-11 02:28:55,624 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-11 02:28:55,626 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-11 02:28:55,626 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-11 02:28:55,630 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-11 02:28:55,630 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 11.10 02:28:54" (1/3) ... [2021-10-11 02:28:55,631 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6198da2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 02:28:55, skipping insertion in model container [2021-10-11 02:28:55,631 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:28:54" (2/3) ... [2021-10-11 02:28:55,632 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6198da2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 02:28:55, skipping insertion in model container [2021-10-11 02:28:55,632 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:28:55" (3/3) ... [2021-10-11 02:28:55,634 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2021-10-11 02:28:55,648 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-11 02:28:55,651 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-10-11 02:28:55,663 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-11 02:28:55,688 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-10-11 02:28:55,688 INFO L378 AbstractCegarLoop]: Hoare is true [2021-10-11 02:28:55,688 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-10-11 02:28:55,688 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-10-11 02:28:55,689 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-10-11 02:28:55,689 INFO L382 AbstractCegarLoop]: Difference is false [2021-10-11 02:28:55,689 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-10-11 02:28:55,689 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-10-11 02:28:55,702 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2021-10-11 02:28:55,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-10-11 02:28:55,707 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:28:55,708 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:28:55,709 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:28:55,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:28:55,715 INFO L82 PathProgramCache]: Analyzing trace with hash -731561975, now seen corresponding path program 1 times [2021-10-11 02:28:55,725 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:28:55,725 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717060692] [2021-10-11 02:28:55,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:28:55,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:28:55,873 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:28:55,874 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717060692] [2021-10-11 02:28:55,875 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-11 02:28:55,875 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-11 02:28:55,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014914376] [2021-10-11 02:28:55,880 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-10-11 02:28:55,881 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:28:55,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-11 02:28:55,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-11 02:28:55,897 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 3 states. [2021-10-11 02:28:55,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:28:55,989 INFO L93 Difference]: Finished difference Result 43 states and 65 transitions. [2021-10-11 02:28:55,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-11 02:28:55,992 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2021-10-11 02:28:55,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:28:56,002 INFO L225 Difference]: With dead ends: 43 [2021-10-11 02:28:56,002 INFO L226 Difference]: Without dead ends: 21 [2021-10-11 02:28:56,005 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-11 02:28:56,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-10-11 02:28:56,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 17. [2021-10-11 02:28:56,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2021-10-11 02:28:56,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-10-11 02:28:56,040 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 12 [2021-10-11 02:28:56,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:28:56,041 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-10-11 02:28:56,041 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-10-11 02:28:56,041 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-10-11 02:28:56,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-10-11 02:28:56,042 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:28:56,042 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:28:56,042 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-11 02:28:56,043 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:28:56,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:28:56,044 INFO L82 PathProgramCache]: Analyzing trace with hash -1445692596, now seen corresponding path program 1 times [2021-10-11 02:28:56,044 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:28:56,044 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1592233628] [2021-10-11 02:28:56,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:28:56,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:28:56,121 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:28:56,122 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1592233628] [2021-10-11 02:28:56,122 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455566049] [2021-10-11 02:28:56,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:28:56,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:28:56,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-11 02:28:56,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:28:56,330 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:28:56,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:28:56,368 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:28:56,369 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1978684946] [2021-10-11 02:28:56,391 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-10-11 02:28:56,392 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:28:56,396 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-11 02:28:56,402 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-11 02:28:56,402 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-11 02:28:57,810 INFO L180 IcfgInterpreter]: Interpretation finished [2021-10-11 02:28:57,957 WARN L197 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 56 [2021-10-11 02:28:58,080 WARN L197 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 30 [2021-10-11 02:28:58,213 WARN L197 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2021-10-11 02:28:58,344 WARN L197 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2021-10-11 02:28:59,044 WARN L197 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 60 [2021-10-11 02:28:59,047 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-11 02:28:59,047 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:28:59,048 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-10-11 02:28:59,049 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506217842] [2021-10-11 02:28:59,051 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-10-11 02:28:59,051 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:28:59,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-11 02:28:59,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2021-10-11 02:28:59,065 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand 7 states. [2021-10-11 02:28:59,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:28:59,132 INFO L93 Difference]: Finished difference Result 41 states and 54 transitions. [2021-10-11 02:28:59,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-11 02:28:59,133 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2021-10-11 02:28:59,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:28:59,134 INFO L225 Difference]: With dead ends: 41 [2021-10-11 02:28:59,135 INFO L226 Difference]: Without dead ends: 27 [2021-10-11 02:28:59,136 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2021-10-11 02:28:59,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-10-11 02:28:59,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2021-10-11 02:28:59,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2021-10-11 02:28:59,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-10-11 02:28:59,141 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 16 [2021-10-11 02:28:59,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:28:59,141 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-10-11 02:28:59,141 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-10-11 02:28:59,141 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-10-11 02:28:59,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-11 02:28:59,142 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:28:59,142 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:28:59,367 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-10-11 02:28:59,367 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:28:59,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:28:59,368 INFO L82 PathProgramCache]: Analyzing trace with hash 1675646815, now seen corresponding path program 2 times [2021-10-11 02:28:59,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:28:59,368 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111207386] [2021-10-11 02:28:59,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:28:59,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:28:59,477 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-10-11 02:28:59,478 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111207386] [2021-10-11 02:28:59,479 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [293385439] [2021-10-11 02:28:59,479 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:28:59,560 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-11 02:28:59,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-11 02:28:59,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-11 02:28:59,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:28:59,653 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-10-11 02:28:59,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:28:59,718 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-10-11 02:28:59,719 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [433186474] [2021-10-11 02:28:59,721 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-10-11 02:28:59,722 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:28:59,722 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-11 02:28:59,722 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-11 02:28:59,722 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-11 02:29:00,419 INFO L180 IcfgInterpreter]: Interpretation finished [2021-10-11 02:29:00,552 WARN L197 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 56 [2021-10-11 02:29:00,781 WARN L197 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2021-10-11 02:29:00,905 WARN L197 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2021-10-11 02:29:01,597 WARN L197 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 60 [2021-10-11 02:29:01,598 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-11 02:29:01,599 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:29:01,599 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 7 [2021-10-11 02:29:01,599 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418469368] [2021-10-11 02:29:01,600 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-10-11 02:29:01,600 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:29:01,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-11 02:29:01,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2021-10-11 02:29:01,602 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 8 states. [2021-10-11 02:29:01,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:29:01,652 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2021-10-11 02:29:01,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-11 02:29:01,653 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2021-10-11 02:29:01,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:29:01,654 INFO L225 Difference]: With dead ends: 46 [2021-10-11 02:29:01,654 INFO L226 Difference]: Without dead ends: 29 [2021-10-11 02:29:01,655 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2021-10-11 02:29:01,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-10-11 02:29:01,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2021-10-11 02:29:01,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2021-10-11 02:29:01,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2021-10-11 02:29:01,666 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 22 [2021-10-11 02:29:01,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:29:01,667 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2021-10-11 02:29:01,667 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-10-11 02:29:01,667 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2021-10-11 02:29:01,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-10-11 02:29:01,668 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:29:01,670 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:29:01,899 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:29:01,899 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:29:01,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:29:01,900 INFO L82 PathProgramCache]: Analyzing trace with hash 159019788, now seen corresponding path program 3 times [2021-10-11 02:29:01,900 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:29:01,900 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [53774572] [2021-10-11 02:29:01,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:29:01,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-11 02:29:01,988 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-11 02:29:02,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-11 02:29:02,055 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-11 02:29:02,084 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-10-11 02:29:02,084 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-10-11 02:29:02,085 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-10-11 02:29:02,155 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 11.10 02:29:02 BoogieIcfgContainer [2021-10-11 02:29:02,156 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-11 02:29:02,156 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-11 02:29:02,157 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-11 02:29:02,157 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-11 02:29:02,157 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:28:55" (3/4) ... [2021-10-11 02:29:02,161 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-10-11 02:29:02,161 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-11 02:29:02,167 INFO L168 Benchmark]: Toolchain (without parser) took 7601.05 ms. Allocated memory was 100.7 MB in the beginning and 146.8 MB in the end (delta: 46.1 MB). Free memory was 60.7 MB in the beginning and 55.1 MB in the end (delta: 5.6 MB). Peak memory consumption was 52.5 MB. Max. memory is 16.1 GB. [2021-10-11 02:29:02,168 INFO L168 Benchmark]: CDTParser took 0.30 ms. Allocated memory is still 100.7 MB. Free memory was 77.5 MB in the beginning and 77.5 MB in the end (delta: 51.5 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 02:29:02,169 INFO L168 Benchmark]: CACSL2BoogieTranslator took 332.06 ms. Allocated memory is still 100.7 MB. Free memory was 60.5 MB in the beginning and 74.7 MB in the end (delta: -14.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-11 02:29:02,171 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.75 ms. Allocated memory is still 100.7 MB. Free memory was 74.7 MB in the beginning and 72.9 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-11 02:29:02,172 INFO L168 Benchmark]: Boogie Preprocessor took 28.04 ms. Allocated memory is still 100.7 MB. Free memory was 72.9 MB in the beginning and 71.6 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 02:29:02,175 INFO L168 Benchmark]: RCFGBuilder took 659.88 ms. Allocated memory is still 100.7 MB. Free memory was 71.6 MB in the beginning and 47.7 MB in the end (delta: 23.8 MB). Peak memory consumption was 25.2 MB. Max. memory is 16.1 GB. [2021-10-11 02:29:02,178 INFO L168 Benchmark]: TraceAbstraction took 6530.05 ms. Allocated memory was 100.7 MB in the beginning and 146.8 MB in the end (delta: 46.1 MB). Free memory was 47.1 MB in the beginning and 55.1 MB in the end (delta: -8.0 MB). Peak memory consumption was 40.1 MB. Max. memory is 16.1 GB. [2021-10-11 02:29:02,179 INFO L168 Benchmark]: Witness Printer took 4.73 ms. Allocated memory is still 146.8 MB. Free memory is still 55.1 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 02:29:02,187 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30 ms. Allocated memory is still 100.7 MB. Free memory was 77.5 MB in the beginning and 77.5 MB in the end (delta: 51.5 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 332.06 ms. Allocated memory is still 100.7 MB. Free memory was 60.5 MB in the beginning and 74.7 MB in the end (delta: -14.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 39.75 ms. Allocated memory is still 100.7 MB. Free memory was 74.7 MB in the beginning and 72.9 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 28.04 ms. Allocated memory is still 100.7 MB. Free memory was 72.9 MB in the beginning and 71.6 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 659.88 ms. Allocated memory is still 100.7 MB. Free memory was 71.6 MB in the beginning and 47.7 MB in the end (delta: 23.8 MB). Peak memory consumption was 25.2 MB. Max. memory is 16.1 GB. * TraceAbstraction took 6530.05 ms. Allocated memory was 100.7 MB in the beginning and 146.8 MB in the end (delta: 46.1 MB). Free memory was 47.1 MB in the beginning and 55.1 MB in the end (delta: -8.0 MB). Peak memory consumption was 40.1 MB. Max. memory is 16.1 GB. * Witness Printer took 4.73 ms. Allocated memory is still 146.8 MB. Free memory is still 55.1 MB. There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 20]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of shiftLeft at line 69. Possible FailurePath: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND FALSE !(i<5) [L37] EXPR string_A[5 -1] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND FALSE !(i<5) [L41] EXPR string_B[5 -1] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 [L44] EXPR string_A[nc_A] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 [L48] EXPR string_B[nc_B] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 [L55] COND FALSE !((inc_B-1)< main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI 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 -> Taipan 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 -> 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 [2021-10-11 02:29:05,383 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-11 02:29:05,410 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-11 02:29:05,413 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-11 02:29:05,414 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-11 02:29:05,415 INFO L275 PluginConnector]: CDTParser initialized [2021-10-11 02:29:05,417 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/../../sv-benchmarks/c/loops/string-2.i [2021-10-11 02:29:05,495 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/data/d1b2efec3/6cdd90daa10f49cfbc32d91de51fa60b/FLAG8b60c60da [2021-10-11 02:29:05,982 INFO L306 CDTParser]: Found 1 translation units. [2021-10-11 02:29:05,983 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/sv-benchmarks/c/loops/string-2.i [2021-10-11 02:29:05,989 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/data/d1b2efec3/6cdd90daa10f49cfbc32d91de51fa60b/FLAG8b60c60da [2021-10-11 02:29:06,370 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/data/d1b2efec3/6cdd90daa10f49cfbc32d91de51fa60b [2021-10-11 02:29:06,373 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-11 02:29:06,376 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-11 02:29:06,380 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-11 02:29:06,380 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-11 02:29:06,384 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-11 02:29:06,385 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 02:29:06" (1/1) ... [2021-10-11 02:29:06,387 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@760c15a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:06, skipping insertion in model container [2021-10-11 02:29:06,387 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 02:29:06" (1/1) ... [2021-10-11 02:29:06,396 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-11 02:29:06,416 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-11 02:29:06,639 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/sv-benchmarks/c/loops/string-2.i[896,909] [2021-10-11 02:29:06,685 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-11 02:29:06,698 INFO L203 MainTranslator]: Completed pre-run [2021-10-11 02:29:06,725 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/sv-benchmarks/c/loops/string-2.i[896,909] [2021-10-11 02:29:06,768 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-11 02:29:06,785 INFO L208 MainTranslator]: Completed translation [2021-10-11 02:29:06,785 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:06 WrapperNode [2021-10-11 02:29:06,785 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-11 02:29:06,787 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-11 02:29:06,787 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-11 02:29:06,787 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-11 02:29:06,794 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:06" (1/1) ... [2021-10-11 02:29:06,804 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:06" (1/1) ... [2021-10-11 02:29:06,833 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-11 02:29:06,835 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-11 02:29:06,836 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-11 02:29:06,836 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-11 02:29:06,844 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:06" (1/1) ... [2021-10-11 02:29:06,845 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:06" (1/1) ... [2021-10-11 02:29:06,854 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:06" (1/1) ... [2021-10-11 02:29:06,854 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:06" (1/1) ... [2021-10-11 02:29:06,872 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:06" (1/1) ... [2021-10-11 02:29:06,882 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:06" (1/1) ... [2021-10-11 02:29:06,890 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:06" (1/1) ... [2021-10-11 02:29:06,893 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-11 02:29:06,897 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-11 02:29:06,898 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-11 02:29:06,898 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-11 02:29:06,899 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:06" (1/1) ... No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-11 02:29:06,985 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-10-11 02:29:06,989 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-10-11 02:29:06,989 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-11 02:29:06,989 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-11 02:29:06,990 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-11 02:29:06,990 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-10-11 02:29:06,990 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-11 02:29:07,435 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-11 02:29:07,451 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2021-10-11 02:29:07,453 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:29:07 BoogieIcfgContainer [2021-10-11 02:29:07,453 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-11 02:29:07,455 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-11 02:29:07,455 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-11 02:29:07,458 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-11 02:29:07,458 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 11.10 02:29:06" (1/3) ... [2021-10-11 02:29:07,459 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f2a1d12 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 02:29:07, skipping insertion in model container [2021-10-11 02:29:07,459 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:29:06" (2/3) ... [2021-10-11 02:29:07,460 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f2a1d12 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 02:29:07, skipping insertion in model container [2021-10-11 02:29:07,460 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:29:07" (3/3) ... [2021-10-11 02:29:07,461 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2021-10-11 02:29:07,487 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-11 02:29:07,491 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-10-11 02:29:07,505 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-11 02:29:07,552 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-10-11 02:29:07,552 INFO L378 AbstractCegarLoop]: Hoare is true [2021-10-11 02:29:07,553 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-10-11 02:29:07,553 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-10-11 02:29:07,553 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-10-11 02:29:07,553 INFO L382 AbstractCegarLoop]: Difference is false [2021-10-11 02:29:07,553 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-10-11 02:29:07,553 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-10-11 02:29:07,565 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2021-10-11 02:29:07,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-10-11 02:29:07,572 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:29:07,572 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:29:07,573 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:29:07,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:29:07,579 INFO L82 PathProgramCache]: Analyzing trace with hash 374782792, now seen corresponding path program 1 times [2021-10-11 02:29:07,605 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-11 02:29:07,605 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1424135726] [2021-10-11 02:29:07,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/mathsat Starting monitored process 2 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with mathsat -unsat_core_generation=3 [2021-10-11 02:29:07,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:07,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 1 conjunts are in the unsatisfiable core [2021-10-11 02:29:07,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:07,745 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:29:07,746 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-10-11 02:29:07,746 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1424135726] [2021-10-11 02:29:07,747 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-11 02:29:07,747 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-11 02:29:07,748 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282636678] [2021-10-11 02:29:07,752 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2021-10-11 02:29:07,752 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-11 02:29:07,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-10-11 02:29:07,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-11 02:29:07,768 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2021-10-11 02:29:07,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:29:07,785 INFO L93 Difference]: Finished difference Result 48 states and 74 transitions. [2021-10-11 02:29:07,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-10-11 02:29:07,786 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 16 [2021-10-11 02:29:07,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:29:07,794 INFO L225 Difference]: With dead ends: 48 [2021-10-11 02:29:07,794 INFO L226 Difference]: Without dead ends: 22 [2021-10-11 02:29:07,797 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-11 02:29:07,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-10-11 02:29:07,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-10-11 02:29:07,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2021-10-11 02:29:07,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-10-11 02:29:07,838 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 16 [2021-10-11 02:29:07,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:29:07,839 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-10-11 02:29:07,839 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2021-10-11 02:29:07,839 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-10-11 02:29:07,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-10-11 02:29:07,841 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:29:07,841 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:29:08,058 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 mathsat -unsat_core_generation=3 [2021-10-11 02:29:08,058 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:29:08,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:29:08,060 INFO L82 PathProgramCache]: Analyzing trace with hash 1602331574, now seen corresponding path program 1 times [2021-10-11 02:29:08,060 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-11 02:29:08,061 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [125112840] [2021-10-11 02:29:08,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/mathsat Starting monitored process 3 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with mathsat -unsat_core_generation=3 [2021-10-11 02:29:08,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:08,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 2 conjunts are in the unsatisfiable core [2021-10-11 02:29:08,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:08,171 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:29:08,171 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-10-11 02:29:08,171 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [125112840] [2021-10-11 02:29:08,172 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-11 02:29:08,172 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-11 02:29:08,172 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51368715] [2021-10-11 02:29:08,173 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-10-11 02:29:08,173 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-11 02:29:08,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-11 02:29:08,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-11 02:29:08,175 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand 3 states. [2021-10-11 02:29:08,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:29:08,269 INFO L93 Difference]: Finished difference Result 50 states and 62 transitions. [2021-10-11 02:29:08,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-11 02:29:08,271 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2021-10-11 02:29:08,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:29:08,274 INFO L225 Difference]: With dead ends: 50 [2021-10-11 02:29:08,275 INFO L226 Difference]: Without dead ends: 32 [2021-10-11 02:29:08,275 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-11 02:29:08,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-10-11 02:29:08,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2021-10-11 02:29:08,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2021-10-11 02:29:08,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2021-10-11 02:29:08,292 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 18 [2021-10-11 02:29:08,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:29:08,294 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2021-10-11 02:29:08,297 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-10-11 02:29:08,297 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2021-10-11 02:29:08,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-11 02:29:08,298 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:29:08,299 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:29:08,507 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 mathsat -unsat_core_generation=3 [2021-10-11 02:29:08,507 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:29:08,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:29:08,508 INFO L82 PathProgramCache]: Analyzing trace with hash 177830358, now seen corresponding path program 1 times [2021-10-11 02:29:08,510 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-11 02:29:08,510 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1930094138] [2021-10-11 02:29:08,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/mathsat Starting monitored process 4 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with mathsat -unsat_core_generation=3 [2021-10-11 02:29:08,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:08,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-11 02:29:08,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:08,622 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:29:08,622 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:29:08,671 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:29:08,672 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1930094138] [2021-10-11 02:29:08,672 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [983770217] [2021-10-11 02:29:08,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/cvc4 Starting monitored process 5 with cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --incremental --print-success --lang smt [2021-10-11 02:29:08,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:08,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-11 02:29:08,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:08,841 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:29:08,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:29:08,870 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:29:08,870 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1802691364] [2021-10-11 02:29:08,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:29:08,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:08,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-11 02:29:08,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:08,988 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:29:08,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:29:09,028 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:29:09,030 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-11 02:29:09,030 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 6 [2021-10-11 02:29:09,030 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858307048] [2021-10-11 02:29:09,032 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-10-11 02:29:09,032 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-11 02:29:09,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-11 02:29:09,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-11 02:29:09,035 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 6 states. [2021-10-11 02:29:09,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:29:09,303 INFO L93 Difference]: Finished difference Result 79 states and 98 transitions. [2021-10-11 02:29:09,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-11 02:29:09,305 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2021-10-11 02:29:09,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:29:09,306 INFO L225 Difference]: With dead ends: 79 [2021-10-11 02:29:09,307 INFO L226 Difference]: Without dead ends: 60 [2021-10-11 02:29:09,307 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-10-11 02:29:09,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-10-11 02:29:09,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 36. [2021-10-11 02:29:09,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2021-10-11 02:29:09,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2021-10-11 02:29:09,314 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 22 [2021-10-11 02:29:09,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:29:09,314 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2021-10-11 02:29:09,314 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-10-11 02:29:09,314 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2021-10-11 02:29:09,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-10-11 02:29:09,316 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:29:09,316 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:29:09,942 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 mathsat -unsat_core_generation=3,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,5 cvc4 --incremental --print-success --lang smt [2021-10-11 02:29:09,942 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:29:09,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:29:09,943 INFO L82 PathProgramCache]: Analyzing trace with hash -583604682, now seen corresponding path program 2 times [2021-10-11 02:29:09,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-11 02:29:09,944 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1650642578] [2021-10-11 02:29:09,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/mathsat Starting monitored process 7 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with mathsat -unsat_core_generation=3 [2021-10-11 02:29:10,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:10,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-11 02:29:10,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:10,108 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-10-11 02:29:10,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:29:10,261 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-10-11 02:29:10,262 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1650642578] [2021-10-11 02:29:10,262 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1268302713] [2021-10-11 02:29:10,262 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/cvc4 Starting monitored process 8 with cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --incremental --print-success --lang smt [2021-10-11 02:29:10,373 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-10-11 02:29:10,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-11 02:29:10,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-11 02:29:10,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:10,504 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-10-11 02:29:10,505 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-10-11 02:29:10,505 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-10-11 02:29:10,505 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7, 7] total 15 [2021-10-11 02:29:10,505 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172671713] [2021-10-11 02:29:10,506 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-10-11 02:29:10,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-11 02:29:10,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-11 02:29:10,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-10-11 02:29:10,507 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 5 states. [2021-10-11 02:29:10,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:29:10,599 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2021-10-11 02:29:10,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-11 02:29:10,600 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 34 [2021-10-11 02:29:10,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:29:10,601 INFO L225 Difference]: With dead ends: 48 [2021-10-11 02:29:10,601 INFO L226 Difference]: Without dead ends: 38 [2021-10-11 02:29:10,602 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2021-10-11 02:29:10,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-10-11 02:29:10,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-10-11 02:29:10,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2021-10-11 02:29:10,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2021-10-11 02:29:10,608 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 34 [2021-10-11 02:29:10,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:29:10,608 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2021-10-11 02:29:10,608 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-10-11 02:29:10,608 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2021-10-11 02:29:10,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-10-11 02:29:10,609 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:29:10,610 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:29:11,026 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 mathsat -unsat_core_generation=3,8 cvc4 --incremental --print-success --lang smt [2021-10-11 02:29:11,026 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:29:11,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:29:11,026 INFO L82 PathProgramCache]: Analyzing trace with hash 1829932657, now seen corresponding path program 1 times [2021-10-11 02:29:11,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-11 02:29:11,027 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2110738520] [2021-10-11 02:29:11,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/mathsat Starting monitored process 9 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with mathsat -unsat_core_generation=3 [2021-10-11 02:29:11,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:11,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-11 02:29:11,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:11,177 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-10-11 02:29:11,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:29:11,318 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-10-11 02:29:11,319 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2110738520] [2021-10-11 02:29:11,320 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [886071695] [2021-10-11 02:29:11,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/cvc4 Starting monitored process 10 with cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --incremental --print-success --lang smt [2021-10-11 02:29:11,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:11,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-11 02:29:11,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:11,516 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-10-11 02:29:11,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:29:11,569 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-10-11 02:29:11,570 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [810757548] [2021-10-11 02:29:11,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:29:11,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:11,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-11 02:29:11,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:11,882 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-10-11 02:29:11,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:29:11,930 INFO L398 QuantifierPusher]: Applying distributivity to a DISJUNCTION[3, 2, 2, 1] term [2021-10-11 02:29:11,931 INFO L639 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2021-10-11 02:29:12,085 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-10-11 02:29:12,086 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 5 imperfect interpolant sequences. [2021-10-11 02:29:12,093 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7, 7, 7, 7, 8] total 19 [2021-10-11 02:29:12,093 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413503909] [2021-10-11 02:29:12,094 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-10-11 02:29:12,094 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-11 02:29:12,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-11 02:29:12,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2021-10-11 02:29:12,095 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 4 states. [2021-10-11 02:29:12,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:29:12,285 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2021-10-11 02:29:12,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-11 02:29:12,287 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 36 [2021-10-11 02:29:12,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:29:12,288 INFO L225 Difference]: With dead ends: 43 [2021-10-11 02:29:12,288 INFO L226 Difference]: Without dead ends: 39 [2021-10-11 02:29:12,288 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 192 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2021-10-11 02:29:12,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-10-11 02:29:12,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-10-11 02:29:12,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2021-10-11 02:29:12,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2021-10-11 02:29:12,294 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 36 [2021-10-11 02:29:12,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:29:12,294 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2021-10-11 02:29:12,295 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2021-10-11 02:29:12,295 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2021-10-11 02:29:12,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-10-11 02:29:12,296 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:29:12,296 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:29:12,901 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 mathsat -unsat_core_generation=3,10 cvc4 --incremental --print-success --lang smt,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:29:12,901 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:29:12,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:29:12,901 INFO L82 PathProgramCache]: Analyzing trace with hash 1974004308, now seen corresponding path program 1 times [2021-10-11 02:29:12,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-11 02:29:12,902 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [270815663] [2021-10-11 02:29:12,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/mathsat Starting monitored process 12 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with mathsat -unsat_core_generation=3 [2021-10-11 02:29:12,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:12,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-11 02:29:12,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:13,063 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-10-11 02:29:13,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:29:13,225 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-10-11 02:29:13,225 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [270815663] [2021-10-11 02:29:13,225 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1134263305] [2021-10-11 02:29:13,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/cvc4 Starting monitored process 13 with cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --incremental --print-success --lang smt [2021-10-11 02:29:13,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:13,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-11 02:29:13,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:13,458 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-10-11 02:29:13,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:29:13,505 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-10-11 02:29:13,505 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601128290] [2021-10-11 02:29:13,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:29:13,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:13,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-11 02:29:13,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:13,671 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-10-11 02:29:13,671 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-10-11 02:29:13,671 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 4 imperfect interpolant sequences. [2021-10-11 02:29:13,672 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7, 7, 7, 7] total 14 [2021-10-11 02:29:13,672 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350732306] [2021-10-11 02:29:13,674 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-10-11 02:29:13,674 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-11 02:29:13,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-11 02:29:13,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2021-10-11 02:29:13,675 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand 4 states. [2021-10-11 02:29:13,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:29:13,749 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2021-10-11 02:29:13,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-11 02:29:13,750 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 38 [2021-10-11 02:29:13,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:29:13,756 INFO L225 Difference]: With dead ends: 54 [2021-10-11 02:29:13,756 INFO L226 Difference]: Without dead ends: 41 [2021-10-11 02:29:13,757 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 170 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2021-10-11 02:29:13,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-10-11 02:29:13,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-10-11 02:29:13,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2021-10-11 02:29:13,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2021-10-11 02:29:13,775 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 38 [2021-10-11 02:29:13,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:29:13,776 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2021-10-11 02:29:13,776 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2021-10-11 02:29:13,776 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2021-10-11 02:29:13,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-10-11 02:29:13,780 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:29:13,780 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:29:14,391 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 cvc4 --incremental --print-success --lang smt,12 mathsat -unsat_core_generation=3 [2021-10-11 02:29:14,391 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:29:14,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:29:14,392 INFO L82 PathProgramCache]: Analyzing trace with hash 420019641, now seen corresponding path program 1 times [2021-10-11 02:29:14,392 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-11 02:29:14,393 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [392797448] [2021-10-11 02:29:14,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/mathsat Starting monitored process 15 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with mathsat -unsat_core_generation=3 [2021-10-11 02:29:14,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:14,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-11 02:29:14,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:14,540 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-10-11 02:29:14,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:29:14,683 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-10-11 02:29:14,683 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [392797448] [2021-10-11 02:29:14,684 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1530397979] [2021-10-11 02:29:14,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/cvc4 Starting monitored process 16 with cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --incremental --print-success --lang smt [2021-10-11 02:29:14,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:14,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-11 02:29:14,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:14,868 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-10-11 02:29:14,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:29:14,920 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-10-11 02:29:14,921 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [505243636] [2021-10-11 02:29:14,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:29:15,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:29:15,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-11 02:29:15,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:29:15,045 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-10-11 02:29:15,046 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:29:15,102 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-10-11 02:29:15,102 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-11 02:29:15,102 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 12 [2021-10-11 02:29:15,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790739886] [2021-10-11 02:29:15,104 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-10-11 02:29:15,104 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-11 02:29:15,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-11 02:29:15,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-10-11 02:29:15,105 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand 12 states. [2021-10-11 02:29:15,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:29:15,546 INFO L93 Difference]: Finished difference Result 102 states and 118 transitions. [2021-10-11 02:29:15,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-11 02:29:15,546 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2021-10-11 02:29:15,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:29:15,547 INFO L225 Difference]: With dead ends: 102 [2021-10-11 02:29:15,547 INFO L226 Difference]: Without dead ends: 72 [2021-10-11 02:29:15,548 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 224 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-10-11 02:29:15,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-10-11 02:29:15,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 45. [2021-10-11 02:29:15,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2021-10-11 02:29:15,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2021-10-11 02:29:15,554 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 40 [2021-10-11 02:29:15,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:29:15,555 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2021-10-11 02:29:15,555 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-10-11 02:29:15,555 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2021-10-11 02:29:15,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-10-11 02:29:15,556 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:29:15,556 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:29:16,160 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 cvc4 --incremental --print-success --lang smt,15 mathsat -unsat_core_generation=3,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:29:16,160 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:29:16,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:29:16,161 INFO L82 PathProgramCache]: Analyzing trace with hash -512239655, now seen corresponding path program 2 times [2021-10-11 02:29:16,161 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-11 02:29:16,161 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2091934435] [2021-10-11 02:29:16,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/mathsat Starting monitored process 18 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with mathsat -unsat_core_generation=3 [2021-10-11 02:29:16,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-11 02:29:16,335 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-11 02:29:16,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-11 02:29:16,484 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-11 02:29:16,568 INFO L173 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2021-10-11 02:29:16,570 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-10-11 02:29:16,779 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 mathsat -unsat_core_generation=3 [2021-10-11 02:29:16,910 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 11.10 02:29:16 BoogieIcfgContainer [2021-10-11 02:29:16,927 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-11 02:29:16,927 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-11 02:29:16,927 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-11 02:29:16,928 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-11 02:29:16,928 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:29:07" (3/4) ... [2021-10-11 02:29:16,930 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-10-11 02:29:17,023 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75723a26-c57c-425a-b80a-9d7615e9bceb/bin/utaipan-WLngWcDbfI/witness.graphml [2021-10-11 02:29:17,027 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-11 02:29:17,028 INFO L168 Benchmark]: Toolchain (without parser) took 10651.59 ms. Allocated memory was 52.4 MB in the beginning and 100.7 MB in the end (delta: 48.2 MB). Free memory was 29.4 MB in the beginning and 73.0 MB in the end (delta: -43.6 MB). Peak memory consumption was 3.6 MB. Max. memory is 16.1 GB. [2021-10-11 02:29:17,033 INFO L168 Benchmark]: CDTParser took 0.33 ms. Allocated memory is still 52.4 MB. Free memory was 34.1 MB in the beginning and 34.1 MB in the end (delta: 38.1 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 02:29:17,033 INFO L168 Benchmark]: CACSL2BoogieTranslator took 406.18 ms. Allocated memory was 52.4 MB in the beginning and 69.2 MB in the end (delta: 16.8 MB). Free memory was 29.2 MB in the beginning and 51.9 MB in the end (delta: -22.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-11 02:29:17,034 INFO L168 Benchmark]: Boogie Procedure Inliner took 47.13 ms. Allocated memory is still 69.2 MB. Free memory was 51.8 MB in the beginning and 50.1 MB in the end (delta: 1.7 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 02:29:17,034 INFO L168 Benchmark]: Boogie Preprocessor took 60.95 ms. Allocated memory is still 69.2 MB. Free memory was 50.1 MB in the beginning and 48.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-11 02:29:17,034 INFO L168 Benchmark]: RCFGBuilder took 556.16 ms. Allocated memory is still 69.2 MB. Free memory was 48.6 MB in the beginning and 50.3 MB in the end (delta: -1.8 MB). Peak memory consumption was 20.5 MB. Max. memory is 16.1 GB. [2021-10-11 02:29:17,035 INFO L168 Benchmark]: TraceAbstraction took 9471.94 ms. Allocated memory was 69.2 MB in the beginning and 100.7 MB in the end (delta: 31.5 MB). Free memory was 49.8 MB in the beginning and 77.2 MB in the end (delta: -27.4 MB). Peak memory consumption was 55.1 MB. Max. memory is 16.1 GB. [2021-10-11 02:29:17,035 INFO L168 Benchmark]: Witness Printer took 99.74 ms. Allocated memory is still 100.7 MB. Free memory was 77.2 MB in the beginning and 73.0 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-10-11 02:29:17,038 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33 ms. Allocated memory is still 52.4 MB. Free memory was 34.1 MB in the beginning and 34.1 MB in the end (delta: 38.1 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 406.18 ms. Allocated memory was 52.4 MB in the beginning and 69.2 MB in the end (delta: 16.8 MB). Free memory was 29.2 MB in the beginning and 51.9 MB in the end (delta: -22.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 47.13 ms. Allocated memory is still 69.2 MB. Free memory was 51.8 MB in the beginning and 50.1 MB in the end (delta: 1.7 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 60.95 ms. Allocated memory is still 69.2 MB. Free memory was 50.1 MB in the beginning and 48.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 556.16 ms. Allocated memory is still 69.2 MB. Free memory was 48.6 MB in the beginning and 50.3 MB in the end (delta: -1.8 MB). Peak memory consumption was 20.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 9471.94 ms. Allocated memory was 69.2 MB in the beginning and 100.7 MB in the end (delta: 31.5 MB). Free memory was 49.8 MB in the beginning and 77.2 MB in the end (delta: -27.4 MB). Peak memory consumption was 55.1 MB. Max. memory is 16.1 GB. * Witness Printer took 99.74 ms. Allocated memory is still 100.7 MB. Free memory was 77.2 MB in the beginning and 73.0 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 20]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND FALSE !(i<5) [L37] EXPR string_A[5 -1] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND FALSE !(i<5) [L41] EXPR string_B[5 -1] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 [L44] EXPR string_A[nc_A] [L44] COND TRUE string_A[nc_A]!='\0' [L45] nc_A++ [L44] EXPR string_A[nc_A] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 [L48] EXPR string_B[nc_B] [L48] COND TRUE string_B[nc_B]!='\0' [L49] nc_B++ [L48] EXPR string_B[nc_B] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 [L55] COND TRUE (inc_B-1)<