./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pals_lcr.3.ufo.UNBOUNDED.pals+Problem12_label03.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6a47aea7 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.3.ufo.UNBOUNDED.pals+Problem12_label03.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl --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 eac7eb39c98aff4ef80806ab78ab5db437ac2c7b09e47bea802a0bba118466ba --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:50:03,036 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:50:03,038 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:50:03,076 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:50:03,076 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:50:03,078 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:50:03,080 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:50:03,083 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:50:03,085 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:50:03,087 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:50:03,088 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:50:03,090 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:50:03,090 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:50:03,092 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:50:03,094 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:50:03,095 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:50:03,097 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:50:03,098 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:50:03,101 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:50:03,108 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:50:03,113 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:50:03,117 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:50:03,118 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:50:03,122 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:50:03,127 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:50:03,127 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:50:03,128 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:50:03,129 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:50:03,130 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:50:03,152 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:50:03,152 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:50:03,153 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:50:03,154 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:50:03,155 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:50:03,157 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:50:03,157 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:50:03,158 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:50:03,159 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:50:03,159 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:50:03,160 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:50:03,161 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:50:03,162 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 16:50:03,207 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:50:03,208 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:50:03,208 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:50:03,208 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:50:03,209 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:50:03,209 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:50:03,210 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:50:03,210 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:50:03,210 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:50:03,210 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 16:50:03,211 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:50:03,211 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:50:03,211 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 16:50:03,211 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 16:50:03,211 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:50:03,212 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 16:50:03,212 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 16:50:03,212 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 16:50:03,213 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:50:03,213 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:50:03,214 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 16:50:03,214 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:50:03,214 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:50:03,214 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:50:03,214 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:50:03,215 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:50:03,215 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:50:03,215 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:50:03,215 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:50:03,216 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:50:03,216 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:50:03,216 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:50:03,216 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:50:03,217 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:50:03,217 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:50:03,217 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:50:03,217 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 16:50:03,218 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 16:50:03,218 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:50:03,218 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:50:03,218 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:50:03,218 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_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> eac7eb39c98aff4ef80806ab78ab5db437ac2c7b09e47bea802a0bba118466ba [2021-11-23 16:50:03,455 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:50:03,491 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:50:03,494 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:50:03,495 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:50:03,496 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:50:03,498 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.3.ufo.UNBOUNDED.pals+Problem12_label03.c [2021-11-23 16:50:03,573 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/data/8a7f05056/1fe8088bfa0a488594b6b83d418584ee/FLAGf372e6137 [2021-11-23 16:50:04,443 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:50:04,444 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/sv-benchmarks/c/combinations/pals_lcr.3.ufo.UNBOUNDED.pals+Problem12_label03.c [2021-11-23 16:50:04,473 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/data/8a7f05056/1fe8088bfa0a488594b6b83d418584ee/FLAGf372e6137 [2021-11-23 16:50:04,916 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/data/8a7f05056/1fe8088bfa0a488594b6b83d418584ee [2021-11-23 16:50:04,918 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:50:04,920 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:50:04,922 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:50:04,923 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:50:04,940 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:50:04,940 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:50:04" (1/1) ... [2021-11-23 16:50:04,945 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39585c4a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:04, skipping insertion in model container [2021-11-23 16:50:04,945 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:50:04" (1/1) ... [2021-11-23 16:50:04,953 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:50:05,135 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:50:05,437 WARN L230 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_39b86ddc-052d-4e3f-989c-edfdd2bca273/sv-benchmarks/c/combinations/pals_lcr.3.ufo.UNBOUNDED.pals+Problem12_label03.c[6450,6463] [2021-11-23 16:50:05,474 WARN L230 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_39b86ddc-052d-4e3f-989c-edfdd2bca273/sv-benchmarks/c/combinations/pals_lcr.3.ufo.UNBOUNDED.pals+Problem12_label03.c[8787,8800] [2021-11-23 16:50:06,512 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:50:06,523 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:50:06,601 WARN L230 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_39b86ddc-052d-4e3f-989c-edfdd2bca273/sv-benchmarks/c/combinations/pals_lcr.3.ufo.UNBOUNDED.pals+Problem12_label03.c[6450,6463] [2021-11-23 16:50:06,627 WARN L230 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_39b86ddc-052d-4e3f-989c-edfdd2bca273/sv-benchmarks/c/combinations/pals_lcr.3.ufo.UNBOUNDED.pals+Problem12_label03.c[8787,8800] [2021-11-23 16:50:07,253 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:50:07,287 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:50:07,288 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:07 WrapperNode [2021-11-23 16:50:07,288 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:50:07,289 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:50:07,290 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:50:07,290 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:50:07,298 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:07" (1/1) ... [2021-11-23 16:50:07,370 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:07" (1/1) ... [2021-11-23 16:50:07,728 INFO L137 Inliner]: procedures = 35, calls = 20, calls flagged for inlining = 15, calls inlined = 15, statements flattened = 4976 [2021-11-23 16:50:07,728 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:50:07,729 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:50:07,729 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:50:07,730 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:50:07,740 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:07" (1/1) ... [2021-11-23 16:50:07,740 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:07" (1/1) ... [2021-11-23 16:50:07,893 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:07" (1/1) ... [2021-11-23 16:50:07,893 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:07" (1/1) ... [2021-11-23 16:50:08,076 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:07" (1/1) ... [2021-11-23 16:50:08,169 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:07" (1/1) ... [2021-11-23 16:50:08,188 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:07" (1/1) ... [2021-11-23 16:50:08,240 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:50:08,242 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:50:08,242 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:50:08,242 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:50:08,243 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:07" (1/1) ... [2021-11-23 16:50:08,253 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:50:08,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:50:08,285 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:50:08,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:50:08,341 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:50:08,341 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 16:50:08,341 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:50:08,342 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:50:08,490 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:50:08,507 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:50:13,160 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:50:13,250 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 16:50:13,263 INFO L158 Benchmark]: Toolchain (without parser) took 8340.73ms. Allocated memory was 90.2MB in the beginning and 507.5MB in the end (delta: 417.3MB). Free memory was 50.0MB in the beginning and 302.2MB in the end (delta: -252.2MB). Peak memory consumption was 253.8MB. Max. memory is 16.1GB. [2021-11-23 16:50:13,265 INFO L158 Benchmark]: CDTParser took 0.34ms. Allocated memory is still 90.2MB. Free memory was 59.5MB in the beginning and 59.5MB in the end (delta: 40.9kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:50:13,267 INFO L158 Benchmark]: CACSL2BoogieTranslator took 2366.98ms. Allocated memory was 90.2MB in the beginning and 146.8MB in the end (delta: 56.6MB). Free memory was 49.7MB in the beginning and 74.6MB in the end (delta: -24.9MB). Peak memory consumption was 88.9MB. Max. memory is 16.1GB. [2021-11-23 16:50:13,269 INFO L158 Benchmark]: Boogie Procedure Inliner took 438.87ms. Allocated memory was 146.8MB in the beginning and 253.8MB in the end (delta: 107.0MB). Free memory was 74.6MB in the beginning and 141.0MB in the end (delta: -66.4MB). Peak memory consumption was 40.4MB. Max. memory is 16.1GB. [2021-11-23 16:50:13,270 INFO L158 Benchmark]: Boogie Preprocessor took 511.59ms. Allocated memory is still 253.8MB. Free memory was 141.0MB in the beginning and 137.9MB in the end (delta: 3.0MB). Peak memory consumption was 54.7MB. Max. memory is 16.1GB. [2021-11-23 16:50:13,272 INFO L158 Benchmark]: RCFGBuilder took 5017.95ms. Allocated memory was 253.8MB in the beginning and 507.5MB in the end (delta: 253.8MB). Free memory was 137.9MB in the beginning and 302.2MB in the end (delta: -164.3MB). Peak memory consumption was 178.9MB. Max. memory is 16.1GB. [2021-11-23 16:50:13,283 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34ms. Allocated memory is still 90.2MB. Free memory was 59.5MB in the beginning and 59.5MB in the end (delta: 40.9kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 2366.98ms. Allocated memory was 90.2MB in the beginning and 146.8MB in the end (delta: 56.6MB). Free memory was 49.7MB in the beginning and 74.6MB in the end (delta: -24.9MB). Peak memory consumption was 88.9MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 438.87ms. Allocated memory was 146.8MB in the beginning and 253.8MB in the end (delta: 107.0MB). Free memory was 74.6MB in the beginning and 141.0MB in the end (delta: -66.4MB). Peak memory consumption was 40.4MB. Max. memory is 16.1GB. * Boogie Preprocessor took 511.59ms. Allocated memory is still 253.8MB. Free memory was 141.0MB in the beginning and 137.9MB in the end (delta: 3.0MB). Peak memory consumption was 54.7MB. Max. memory is 16.1GB. * RCFGBuilder took 5017.95ms. Allocated memory was 253.8MB in the beginning and 507.5MB in the end (delta: 253.8MB). Free memory was 137.9MB in the beginning and 302.2MB in the end (delta: -164.3MB). Peak memory consumption was 178.9MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 16:50:13,326 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.3.ufo.UNBOUNDED.pals+Problem12_label03.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl --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 eac7eb39c98aff4ef80806ab78ab5db437ac2c7b09e47bea802a0bba118466ba --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:50:15,944 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:50:15,948 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:50:16,018 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:50:16,019 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:50:16,023 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:50:16,025 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:50:16,030 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:50:16,033 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:50:16,041 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:50:16,042 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:50:16,044 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:50:16,044 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:50:16,045 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:50:16,047 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:50:16,049 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:50:16,050 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:50:16,051 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:50:16,053 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:50:16,055 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:50:16,057 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:50:16,063 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:50:16,065 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:50:16,066 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:50:16,070 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:50:16,070 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:50:16,070 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:50:16,071 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:50:16,072 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:50:16,073 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:50:16,074 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:50:16,075 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:50:16,075 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:50:16,076 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:50:16,077 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:50:16,078 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:50:16,079 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:50:16,079 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:50:16,079 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:50:16,080 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:50:16,081 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:50:16,082 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 16:50:16,126 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:50:16,126 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:50:16,127 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:50:16,127 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:50:16,128 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:50:16,128 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:50:16,128 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:50:16,128 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:50:16,129 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:50:16,129 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:50:16,130 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:50:16,130 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:50:16,132 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:50:16,132 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:50:16,132 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:50:16,133 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:50:16,133 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:50:16,133 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:50:16,133 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:50:16,133 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 16:50:16,133 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 16:50:16,134 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 16:50:16,134 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:50:16,134 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:50:16,134 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:50:16,134 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:50:16,135 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:50:16,135 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 16:50:16,135 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:50:16,135 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:50:16,136 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:50:16,136 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:50:16,136 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:50:16,137 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 16:50:16,137 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 16:50:16,137 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:50:16,137 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:50:16,138 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:50:16,138 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> eac7eb39c98aff4ef80806ab78ab5db437ac2c7b09e47bea802a0bba118466ba [2021-11-23 16:50:16,540 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:50:16,571 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:50:16,574 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:50:16,575 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:50:16,577 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:50:16,579 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.3.ufo.UNBOUNDED.pals+Problem12_label03.c [2021-11-23 16:50:16,661 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/data/a1b688cc8/ee05ddc1376f4b0fb868d34baf7bcc4b/FLAGd291a68f9 [2021-11-23 16:50:17,696 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:50:17,696 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/sv-benchmarks/c/combinations/pals_lcr.3.ufo.UNBOUNDED.pals+Problem12_label03.c [2021-11-23 16:50:17,761 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/data/a1b688cc8/ee05ddc1376f4b0fb868d34baf7bcc4b/FLAGd291a68f9 [2021-11-23 16:50:18,119 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/data/a1b688cc8/ee05ddc1376f4b0fb868d34baf7bcc4b [2021-11-23 16:50:18,123 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:50:18,125 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:50:18,128 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:50:18,128 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:50:18,144 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:50:18,145 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:50:18" (1/1) ... [2021-11-23 16:50:18,146 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ce9435c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:18, skipping insertion in model container [2021-11-23 16:50:18,146 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:50:18" (1/1) ... [2021-11-23 16:50:18,154 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:50:18,311 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:50:18,693 WARN L230 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_39b86ddc-052d-4e3f-989c-edfdd2bca273/sv-benchmarks/c/combinations/pals_lcr.3.ufo.UNBOUNDED.pals+Problem12_label03.c[6450,6463] [2021-11-23 16:50:18,764 WARN L230 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_39b86ddc-052d-4e3f-989c-edfdd2bca273/sv-benchmarks/c/combinations/pals_lcr.3.ufo.UNBOUNDED.pals+Problem12_label03.c[8787,8800] [2021-11-23 16:50:20,103 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:50:20,116 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:50:20,145 WARN L230 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_39b86ddc-052d-4e3f-989c-edfdd2bca273/sv-benchmarks/c/combinations/pals_lcr.3.ufo.UNBOUNDED.pals+Problem12_label03.c[6450,6463] [2021-11-23 16:50:20,151 WARN L230 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_39b86ddc-052d-4e3f-989c-edfdd2bca273/sv-benchmarks/c/combinations/pals_lcr.3.ufo.UNBOUNDED.pals+Problem12_label03.c[8787,8800] [2021-11-23 16:50:20,857 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:50:20,891 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:50:20,892 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:20 WrapperNode [2021-11-23 16:50:20,892 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:50:20,893 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:50:20,894 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:50:20,894 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:50:20,901 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:20" (1/1) ... [2021-11-23 16:50:21,002 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:20" (1/1) ... [2021-11-23 16:50:21,272 INFO L137 Inliner]: procedures = 36, calls = 20, calls flagged for inlining = 15, calls inlined = 15, statements flattened = 4958 [2021-11-23 16:50:21,272 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:50:21,274 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:50:21,274 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:50:21,274 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:50:21,283 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:20" (1/1) ... [2021-11-23 16:50:21,284 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:20" (1/1) ... [2021-11-23 16:50:21,367 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:20" (1/1) ... [2021-11-23 16:50:21,367 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:20" (1/1) ... [2021-11-23 16:50:21,594 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:20" (1/1) ... [2021-11-23 16:50:21,637 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:20" (1/1) ... [2021-11-23 16:50:21,654 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:20" (1/1) ... [2021-11-23 16:50:21,683 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:50:21,685 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:50:21,686 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:50:21,686 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:50:21,687 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:20" (1/1) ... [2021-11-23 16:50:21,698 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:50:21,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:50:21,747 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:50:21,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:50:21,800 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:50:21,801 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 16:50:21,801 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:50:21,801 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:50:21,971 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:50:21,972 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:50:51,053 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:50:51,072 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 16:50:51,072 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 16:50:51,076 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:50:51 BoogieIcfgContainer [2021-11-23 16:50:51,076 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 16:50:51,078 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 16:50:51,079 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 16:50:51,082 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 16:50:51,082 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 04:50:18" (1/3) ... [2021-11-23 16:50:51,083 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64cf921f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:50:51, skipping insertion in model container [2021-11-23 16:50:51,083 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:20" (2/3) ... [2021-11-23 16:50:51,083 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64cf921f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:50:51, skipping insertion in model container [2021-11-23 16:50:51,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:50:51" (3/3) ... [2021-11-23 16:50:51,085 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.3.ufo.UNBOUNDED.pals+Problem12_label03.c [2021-11-23 16:50:51,091 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 16:50:51,092 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 16:50:51,150 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 16:50:51,157 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 16:50:51,158 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 16:50:51,203 INFO L276 IsEmpty]: Start isEmpty. Operand has 880 states, 877 states have (on average 1.903078677309008) internal successors, (1669), 879 states have internal predecessors, (1669), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:51,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 16:50:51,210 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:51,211 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:51,212 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:51,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:51,217 INFO L85 PathProgramCache]: Analyzing trace with hash -1503049691, now seen corresponding path program 1 times [2021-11-23 16:50:51,230 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:51,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1763568271] [2021-11-23 16:50:51,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:51,235 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:51,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:51,246 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:51,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 16:50:51,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:51,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:50:51,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:51,605 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:51,606 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:51,606 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:51,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1763568271] [2021-11-23 16:50:51,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1763568271] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:51,608 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:51,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:50:51,610 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208034204] [2021-11-23 16:50:51,611 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:51,615 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:50:51,627 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:51,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:50:51,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:50:51,686 INFO L87 Difference]: Start difference. First operand has 880 states, 877 states have (on average 1.903078677309008) internal successors, (1669), 879 states have internal predecessors, (1669), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 2 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:28,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:28,256 INFO L93 Difference]: Finished difference Result 2507 states and 4814 transitions. [2021-11-23 16:51:28,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:51:28,263 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 2 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-23 16:51:28,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:28,301 INFO L225 Difference]: With dead ends: 2507 [2021-11-23 16:51:28,301 INFO L226 Difference]: Without dead ends: 1565 [2021-11-23 16:51:28,308 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:28,313 INFO L933 BasicCegarLoop]: 613 mSDtfsCounter, 898 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 2479 mSolverCounterSat, 500 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 29.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 898 SdHoareTripleChecker+Valid, 624 SdHoareTripleChecker+Invalid, 2979 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 500 IncrementalHoareTripleChecker+Valid, 2479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 36.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:28,314 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [898 Valid, 624 Invalid, 2979 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [500 Valid, 2479 Invalid, 0 Unknown, 0 Unchecked, 36.3s Time] [2021-11-23 16:51:28,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1565 states. [2021-11-23 16:51:28,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1565 to 1565. [2021-11-23 16:51:28,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1565 states, 1563 states have (on average 1.6090850927703135) internal successors, (2515), 1564 states have internal predecessors, (2515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:28,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1565 states to 1565 states and 2515 transitions. [2021-11-23 16:51:28,451 INFO L78 Accepts]: Start accepts. Automaton has 1565 states and 2515 transitions. Word has length 20 [2021-11-23 16:51:28,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:28,455 INFO L470 AbstractCegarLoop]: Abstraction has 1565 states and 2515 transitions. [2021-11-23 16:51:28,455 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 2 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:28,455 INFO L276 IsEmpty]: Start isEmpty. Operand 1565 states and 2515 transitions. [2021-11-23 16:51:28,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 16:51:28,459 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:28,460 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:28,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:28,661 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:28,662 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:28,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:28,663 INFO L85 PathProgramCache]: Analyzing trace with hash 783737522, now seen corresponding path program 1 times [2021-11-23 16:51:28,664 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:28,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2007376204] [2021-11-23 16:51:28,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:28,665 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:28,665 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:28,666 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:28,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 16:51:28,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:28,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:51:28,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:28,844 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:28,844 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:28,844 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:28,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2007376204] [2021-11-23 16:51:28,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2007376204] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:28,845 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:28,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:51:28,845 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592833719] [2021-11-23 16:51:28,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:28,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:51:28,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:28,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:51:28,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:51:28,848 INFO L87 Difference]: Start difference. First operand 1565 states and 2515 transitions. Second operand has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:28,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:28,970 INFO L93 Difference]: Finished difference Result 1607 states and 2578 transitions. [2021-11-23 16:51:28,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:51:28,971 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-23 16:51:28,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:28,982 INFO L225 Difference]: With dead ends: 1607 [2021-11-23 16:51:28,983 INFO L226 Difference]: Without dead ends: 1565 [2021-11-23 16:51:28,984 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:51:28,986 INFO L933 BasicCegarLoop]: 1534 mSDtfsCounter, 3 mSDsluCounter, 4583 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 6117 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:28,987 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 6117 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:51:28,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1565 states. [2021-11-23 16:51:29,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1565 to 1565. [2021-11-23 16:51:29,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1565 states, 1563 states have (on average 1.598848368522073) internal successors, (2499), 1564 states have internal predecessors, (2499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:29,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1565 states to 1565 states and 2499 transitions. [2021-11-23 16:51:29,101 INFO L78 Accepts]: Start accepts. Automaton has 1565 states and 2499 transitions. Word has length 26 [2021-11-23 16:51:29,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:29,101 INFO L470 AbstractCegarLoop]: Abstraction has 1565 states and 2499 transitions. [2021-11-23 16:51:29,102 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:29,102 INFO L276 IsEmpty]: Start isEmpty. Operand 1565 states and 2499 transitions. [2021-11-23 16:51:29,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 16:51:29,108 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:29,109 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:29,132 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:29,321 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:29,321 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:29,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:29,323 INFO L85 PathProgramCache]: Analyzing trace with hash -698732182, now seen corresponding path program 1 times [2021-11-23 16:51:29,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:29,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [468887497] [2021-11-23 16:51:29,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:29,326 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:29,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:29,327 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:29,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 16:51:29,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:29,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:51:29,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:29,576 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:29,576 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:29,577 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:29,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [468887497] [2021-11-23 16:51:29,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [468887497] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:29,577 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:29,578 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:51:29,578 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767412778] [2021-11-23 16:51:29,578 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:29,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:51:29,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:29,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:51:29,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:29,580 INFO L87 Difference]: Start difference. First operand 1565 states and 2499 transitions. Second operand has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:29,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:29,633 INFO L93 Difference]: Finished difference Result 1635 states and 2607 transitions. [2021-11-23 16:51:29,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:51:29,634 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-23 16:51:29,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:29,644 INFO L225 Difference]: With dead ends: 1635 [2021-11-23 16:51:29,645 INFO L226 Difference]: Without dead ends: 1597 [2021-11-23 16:51:29,646 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:29,649 INFO L933 BasicCegarLoop]: 1549 mSDtfsCounter, 1484 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1484 SdHoareTripleChecker+Valid, 1610 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:29,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1484 Valid, 1610 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:51:29,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1597 states. [2021-11-23 16:51:29,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1597 to 1595. [2021-11-23 16:51:29,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1595 states, 1593 states have (on average 1.598242310106717) internal successors, (2546), 1594 states have internal predecessors, (2546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:29,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1595 states to 1595 states and 2546 transitions. [2021-11-23 16:51:29,713 INFO L78 Accepts]: Start accepts. Automaton has 1595 states and 2546 transitions. Word has length 41 [2021-11-23 16:51:29,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:29,714 INFO L470 AbstractCegarLoop]: Abstraction has 1595 states and 2546 transitions. [2021-11-23 16:51:29,714 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:29,715 INFO L276 IsEmpty]: Start isEmpty. Operand 1595 states and 2546 transitions. [2021-11-23 16:51:29,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 16:51:29,718 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:29,719 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:29,738 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:29,931 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:29,931 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:29,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:29,932 INFO L85 PathProgramCache]: Analyzing trace with hash -360939040, now seen corresponding path program 1 times [2021-11-23 16:51:29,932 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:29,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [480420498] [2021-11-23 16:51:29,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:29,933 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:29,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:29,934 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:29,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 16:51:30,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:30,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:51:30,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:30,152 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:30,153 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:30,153 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:30,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [480420498] [2021-11-23 16:51:30,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [480420498] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:30,153 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:30,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:51:30,154 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387947171] [2021-11-23 16:51:30,154 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:30,154 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:51:30,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:30,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:51:30,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:30,155 INFO L87 Difference]: Start difference. First operand 1595 states and 2546 transitions. Second operand has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:30,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:30,207 INFO L93 Difference]: Finished difference Result 1719 states and 2738 transitions. [2021-11-23 16:51:30,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:51:30,208 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-23 16:51:30,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:30,218 INFO L225 Difference]: With dead ends: 1719 [2021-11-23 16:51:30,219 INFO L226 Difference]: Without dead ends: 1651 [2021-11-23 16:51:30,220 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:30,221 INFO L933 BasicCegarLoop]: 1544 mSDtfsCounter, 1480 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1480 SdHoareTripleChecker+Valid, 1609 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:30,221 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1480 Valid, 1609 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:51:30,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1651 states. [2021-11-23 16:51:30,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1651 to 1649. [2021-11-23 16:51:30,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1649 states, 1647 states have (on average 1.5962355798421373) internal successors, (2629), 1648 states have internal predecessors, (2629), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:30,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1649 states to 1649 states and 2629 transitions. [2021-11-23 16:51:30,272 INFO L78 Accepts]: Start accepts. Automaton has 1649 states and 2629 transitions. Word has length 41 [2021-11-23 16:51:30,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:30,272 INFO L470 AbstractCegarLoop]: Abstraction has 1649 states and 2629 transitions. [2021-11-23 16:51:30,273 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:30,273 INFO L276 IsEmpty]: Start isEmpty. Operand 1649 states and 2629 transitions. [2021-11-23 16:51:30,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 16:51:30,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:30,274 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:30,298 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:30,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:30,499 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:30,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:30,500 INFO L85 PathProgramCache]: Analyzing trace with hash 857046358, now seen corresponding path program 1 times [2021-11-23 16:51:30,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:30,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1538264808] [2021-11-23 16:51:30,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:30,501 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:30,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:30,502 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:30,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 16:51:30,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:30,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:51:30,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:31,075 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:31,076 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:31,076 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:31,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1538264808] [2021-11-23 16:51:31,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1538264808] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:31,077 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:31,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:51:31,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603545579] [2021-11-23 16:51:31,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:31,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:51:31,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:31,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:51:31,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:51:31,079 INFO L87 Difference]: Start difference. First operand 1649 states and 2629 transitions. Second operand has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:31,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:31,281 INFO L93 Difference]: Finished difference Result 2137 states and 3385 transitions. [2021-11-23 16:51:31,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:51:31,282 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-23 16:51:31,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:31,297 INFO L225 Difference]: With dead ends: 2137 [2021-11-23 16:51:31,297 INFO L226 Difference]: Without dead ends: 2015 [2021-11-23 16:51:31,298 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:51:31,299 INFO L933 BasicCegarLoop]: 1517 mSDtfsCounter, 3103 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3103 SdHoareTripleChecker+Valid, 1722 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:31,300 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3103 Valid, 1722 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:51:31,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2015 states. [2021-11-23 16:51:31,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2015 to 1889. [2021-11-23 16:51:31,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1889 states, 1887 states have (on average 1.5861155272919978) internal successors, (2993), 1888 states have internal predecessors, (2993), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:31,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1889 states to 1889 states and 2993 transitions. [2021-11-23 16:51:31,373 INFO L78 Accepts]: Start accepts. Automaton has 1889 states and 2993 transitions. Word has length 41 [2021-11-23 16:51:31,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:31,375 INFO L470 AbstractCegarLoop]: Abstraction has 1889 states and 2993 transitions. [2021-11-23 16:51:31,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:31,376 INFO L276 IsEmpty]: Start isEmpty. Operand 1889 states and 2993 transitions. [2021-11-23 16:51:31,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 16:51:31,377 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:31,377 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:31,397 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:31,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:31,598 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:31,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:31,598 INFO L85 PathProgramCache]: Analyzing trace with hash 1867096070, now seen corresponding path program 1 times [2021-11-23 16:51:31,599 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:31,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [356644460] [2021-11-23 16:51:31,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:31,599 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:31,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:31,601 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:31,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 16:51:31,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:31,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:51:31,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:31,860 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:31,860 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:31,860 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:31,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [356644460] [2021-11-23 16:51:31,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [356644460] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:31,860 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:31,861 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:51:31,861 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770320699] [2021-11-23 16:51:31,861 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:31,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:51:31,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:31,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:51:31,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:31,862 INFO L87 Difference]: Start difference. First operand 1889 states and 2993 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:31,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:31,953 INFO L93 Difference]: Finished difference Result 2549 states and 3987 transitions. [2021-11-23 16:51:31,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:51:31,954 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-23 16:51:31,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:31,967 INFO L225 Difference]: With dead ends: 2549 [2021-11-23 16:51:31,967 INFO L226 Difference]: Without dead ends: 2187 [2021-11-23 16:51:31,969 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:31,970 INFO L933 BasicCegarLoop]: 1518 mSDtfsCounter, 1471 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1471 SdHoareTripleChecker+Valid, 1570 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:31,970 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1471 Valid, 1570 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:51:31,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2187 states. [2021-11-23 16:51:32,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2187 to 2173. [2021-11-23 16:51:32,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2173 states, 2171 states have (on average 1.5610317825886688) internal successors, (3389), 2172 states have internal predecessors, (3389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:32,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2173 states to 2173 states and 3389 transitions. [2021-11-23 16:51:32,096 INFO L78 Accepts]: Start accepts. Automaton has 2173 states and 3389 transitions. Word has length 43 [2021-11-23 16:51:32,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:32,096 INFO L470 AbstractCegarLoop]: Abstraction has 2173 states and 3389 transitions. [2021-11-23 16:51:32,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:32,097 INFO L276 IsEmpty]: Start isEmpty. Operand 2173 states and 3389 transitions. [2021-11-23 16:51:32,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 16:51:32,099 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:32,099 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:32,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:32,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:32,312 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:32,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:32,312 INFO L85 PathProgramCache]: Analyzing trace with hash -602988295, now seen corresponding path program 1 times [2021-11-23 16:51:32,313 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:32,313 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [329217471] [2021-11-23 16:51:32,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:32,313 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:32,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:32,315 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:32,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 16:51:32,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:32,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:51:32,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:32,505 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:32,505 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:32,505 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:32,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [329217471] [2021-11-23 16:51:32,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [329217471] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:32,506 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:32,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:51:32,506 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877954283] [2021-11-23 16:51:32,506 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:32,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:51:32,507 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:32,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:51:32,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:51:32,508 INFO L87 Difference]: Start difference. First operand 2173 states and 3389 transitions. Second operand has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:32,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:32,712 INFO L93 Difference]: Finished difference Result 2738 states and 4193 transitions. [2021-11-23 16:51:32,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:51:32,714 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-23 16:51:32,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:32,731 INFO L225 Difference]: With dead ends: 2738 [2021-11-23 16:51:32,731 INFO L226 Difference]: Without dead ends: 2736 [2021-11-23 16:51:32,732 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:51:32,733 INFO L933 BasicCegarLoop]: 1555 mSDtfsCounter, 147 mSDsluCounter, 4562 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 6117 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:32,734 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 6117 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:51:32,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2736 states. [2021-11-23 16:51:32,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2736 to 2221. [2021-11-23 16:51:32,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2221 states, 2219 states have (on average 1.5470932852636323) internal successors, (3433), 2220 states have internal predecessors, (3433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:32,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2221 states to 2221 states and 3433 transitions. [2021-11-23 16:51:32,829 INFO L78 Accepts]: Start accepts. Automaton has 2221 states and 3433 transitions. Word has length 44 [2021-11-23 16:51:32,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:32,829 INFO L470 AbstractCegarLoop]: Abstraction has 2221 states and 3433 transitions. [2021-11-23 16:51:32,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:32,830 INFO L276 IsEmpty]: Start isEmpty. Operand 2221 states and 3433 transitions. [2021-11-23 16:51:32,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-23 16:51:32,831 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:32,831 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:32,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:33,043 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:33,044 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:33,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:33,044 INFO L85 PathProgramCache]: Analyzing trace with hash -1900121563, now seen corresponding path program 1 times [2021-11-23 16:51:33,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:33,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [996711649] [2021-11-23 16:51:33,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:33,045 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:33,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:33,046 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:33,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 16:51:33,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:33,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:51:33,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:33,266 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:33,266 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:33,266 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:33,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [996711649] [2021-11-23 16:51:33,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [996711649] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:33,266 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:33,267 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:51:33,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656118181] [2021-11-23 16:51:33,267 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:33,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:51:33,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:33,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:51:33,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:33,268 INFO L87 Difference]: Start difference. First operand 2221 states and 3433 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:33,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:33,371 INFO L93 Difference]: Finished difference Result 2924 states and 4459 transitions. [2021-11-23 16:51:33,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:51:33,372 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-23 16:51:33,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:33,388 INFO L225 Difference]: With dead ends: 2924 [2021-11-23 16:51:33,388 INFO L226 Difference]: Without dead ends: 2525 [2021-11-23 16:51:33,390 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:33,391 INFO L933 BasicCegarLoop]: 1558 mSDtfsCounter, 1485 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1485 SdHoareTripleChecker+Valid, 1615 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:33,392 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1485 Valid, 1615 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:51:33,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2525 states. [2021-11-23 16:51:33,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2525 to 2523. [2021-11-23 16:51:33,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2523 states, 2521 states have (on average 1.5291550971836574) internal successors, (3855), 2522 states have internal predecessors, (3855), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:33,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2523 states to 2523 states and 3855 transitions. [2021-11-23 16:51:33,508 INFO L78 Accepts]: Start accepts. Automaton has 2523 states and 3855 transitions. Word has length 45 [2021-11-23 16:51:33,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:33,509 INFO L470 AbstractCegarLoop]: Abstraction has 2523 states and 3855 transitions. [2021-11-23 16:51:33,509 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:33,509 INFO L276 IsEmpty]: Start isEmpty. Operand 2523 states and 3855 transitions. [2021-11-23 16:51:33,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 16:51:33,511 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:33,511 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:33,527 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:33,724 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:33,724 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:33,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:33,725 INFO L85 PathProgramCache]: Analyzing trace with hash -393288849, now seen corresponding path program 1 times [2021-11-23 16:51:33,726 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:33,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1686151694] [2021-11-23 16:51:33,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:33,726 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:33,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:33,728 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:33,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 16:51:33,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:33,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:51:33,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:33,979 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:33,979 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:33,979 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:33,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1686151694] [2021-11-23 16:51:33,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1686151694] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:33,979 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:33,979 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:51:33,980 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531778104] [2021-11-23 16:51:33,980 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:33,980 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:51:33,980 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:33,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:51:33,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:33,981 INFO L87 Difference]: Start difference. First operand 2523 states and 3855 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:34,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:34,117 INFO L93 Difference]: Finished difference Result 3245 states and 4891 transitions. [2021-11-23 16:51:34,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:51:34,118 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 16:51:34,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:34,133 INFO L225 Difference]: With dead ends: 3245 [2021-11-23 16:51:34,133 INFO L226 Difference]: Without dead ends: 2251 [2021-11-23 16:51:34,135 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:34,137 INFO L933 BasicCegarLoop]: 1544 mSDtfsCounter, 36 mSDsluCounter, 1504 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 3048 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:34,138 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 3048 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:51:34,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2251 states. [2021-11-23 16:51:34,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2251 to 2249. [2021-11-23 16:51:34,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2249 states, 2247 states have (on average 1.5416110369381397) internal successors, (3464), 2248 states have internal predecessors, (3464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:34,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2249 states to 2249 states and 3464 transitions. [2021-11-23 16:51:34,230 INFO L78 Accepts]: Start accepts. Automaton has 2249 states and 3464 transitions. Word has length 64 [2021-11-23 16:51:34,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:34,231 INFO L470 AbstractCegarLoop]: Abstraction has 2249 states and 3464 transitions. [2021-11-23 16:51:34,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:34,232 INFO L276 IsEmpty]: Start isEmpty. Operand 2249 states and 3464 transitions. [2021-11-23 16:51:34,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 16:51:34,233 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:34,234 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:34,250 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:34,446 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:34,446 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:34,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:34,447 INFO L85 PathProgramCache]: Analyzing trace with hash 270205876, now seen corresponding path program 1 times [2021-11-23 16:51:34,448 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:34,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1494145596] [2021-11-23 16:51:34,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:34,448 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:34,449 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:34,450 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:34,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 16:51:34,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:34,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:34,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:36,011 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:36,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:36,915 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:36,915 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:36,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1494145596] [2021-11-23 16:51:36,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1494145596] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:36,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [12392653] [2021-11-23 16:51:36,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:36,916 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:36,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:51:36,923 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:51:36,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-11-23 16:51:37,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:37,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:37,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:38,120 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:38,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:38,775 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:38,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [12392653] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:38,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760415070] [2021-11-23 16:51:38,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:38,775 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:38,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:51:38,785 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:51:38,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 16:51:38,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:38,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:38,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:39,915 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:39,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:40,538 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:40,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [760415070] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:40,539 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:51:40,539 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:51:40,539 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092599220] [2021-11-23 16:51:40,539 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:51:40,540 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:51:40,540 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:40,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:51:40,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:51:40,541 INFO L87 Difference]: Start difference. First operand 2249 states and 3464 transitions. Second operand has 16 states, 16 states have (on average 7.1875) internal successors, (115), 15 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:40,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:40,986 INFO L93 Difference]: Finished difference Result 2970 states and 4487 transitions. [2021-11-23 16:51:40,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:51:40,987 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.1875) internal successors, (115), 15 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-23 16:51:40,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:41,000 INFO L225 Difference]: With dead ends: 2970 [2021-11-23 16:51:41,000 INFO L226 Difference]: Without dead ends: 2272 [2021-11-23 16:51:41,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 376 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:51:41,003 INFO L933 BasicCegarLoop]: 1504 mSDtfsCounter, 4356 mSDsluCounter, 10632 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4356 SdHoareTripleChecker+Valid, 12136 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 57 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:41,004 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4356 Valid, 12136 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 49 Invalid, 0 Unknown, 57 Unchecked, 0.1s Time] [2021-11-23 16:51:41,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2272 states. [2021-11-23 16:51:41,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2272 to 2272. [2021-11-23 16:51:41,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2272 states, 2270 states have (on average 1.5370044052863436) internal successors, (3489), 2271 states have internal predecessors, (3489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:41,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2272 states to 2272 states and 3489 transitions. [2021-11-23 16:51:41,100 INFO L78 Accepts]: Start accepts. Automaton has 2272 states and 3489 transitions. Word has length 66 [2021-11-23 16:51:41,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:41,101 INFO L470 AbstractCegarLoop]: Abstraction has 2272 states and 3489 transitions. [2021-11-23 16:51:41,101 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.1875) internal successors, (115), 15 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:41,101 INFO L276 IsEmpty]: Start isEmpty. Operand 2272 states and 3489 transitions. [2021-11-23 16:51:41,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 16:51:41,102 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:41,103 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:41,116 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:41,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:41,553 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:41,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:41,717 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:41,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:41,717 INFO L85 PathProgramCache]: Analyzing trace with hash -366937100, now seen corresponding path program 1 times [2021-11-23 16:51:41,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:41,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [900684138] [2021-11-23 16:51:41,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:41,718 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:41,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:41,720 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:41,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 16:51:41,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:41,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:41,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:43,468 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:43,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:43,996 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:43,996 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:43,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [900684138] [2021-11-23 16:51:43,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [900684138] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:43,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1825673417] [2021-11-23 16:51:43,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:43,997 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:43,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:51:44,006 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:51:44,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-23 16:51:44,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:44,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:44,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:45,501 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:45,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:45,877 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:45,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1825673417] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:45,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1989642272] [2021-11-23 16:51:45,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:45,878 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:45,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:51:45,886 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:51:45,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 16:51:45,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:45,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:45,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:47,335 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:47,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:47,727 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:47,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1989642272] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:47,728 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:51:47,728 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:51:47,728 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626524168] [2021-11-23 16:51:47,728 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:51:47,729 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:51:47,729 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:47,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:51:47,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:51:47,730 INFO L87 Difference]: Start difference. First operand 2272 states and 3489 transitions. Second operand has 16 states, 16 states have (on average 7.5625) internal successors, (121), 15 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:48,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:48,212 INFO L93 Difference]: Finished difference Result 3006 states and 4530 transitions. [2021-11-23 16:51:48,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:51:48,213 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.5625) internal successors, (121), 15 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-23 16:51:48,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:48,226 INFO L225 Difference]: With dead ends: 3006 [2021-11-23 16:51:48,226 INFO L226 Difference]: Without dead ends: 2308 [2021-11-23 16:51:48,229 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 393 GetRequests, 376 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-11-23 16:51:48,229 INFO L933 BasicCegarLoop]: 1503 mSDtfsCounter, 4407 mSDsluCounter, 10508 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4407 SdHoareTripleChecker+Valid, 12011 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:48,230 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4407 Valid, 12011 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 71 Invalid, 0 Unknown, 81 Unchecked, 0.1s Time] [2021-11-23 16:51:48,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2308 states. [2021-11-23 16:51:48,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2308 to 2282. [2021-11-23 16:51:48,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2282 states, 2280 states have (on average 1.5364035087719299) internal successors, (3503), 2281 states have internal predecessors, (3503), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:48,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2282 states to 2282 states and 3503 transitions. [2021-11-23 16:51:48,346 INFO L78 Accepts]: Start accepts. Automaton has 2282 states and 3503 transitions. Word has length 66 [2021-11-23 16:51:48,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:48,346 INFO L470 AbstractCegarLoop]: Abstraction has 2282 states and 3503 transitions. [2021-11-23 16:51:48,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.5625) internal successors, (121), 15 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:48,347 INFO L276 IsEmpty]: Start isEmpty. Operand 2282 states and 3503 transitions. [2021-11-23 16:51:48,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 16:51:48,349 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:48,349 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:48,362 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:48,567 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:48,796 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:48,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:48,963 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:48,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:48,964 INFO L85 PathProgramCache]: Analyzing trace with hash -29143958, now seen corresponding path program 1 times [2021-11-23 16:51:48,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:48,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [484824429] [2021-11-23 16:51:48,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:48,965 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:48,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:48,966 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:48,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 16:51:49,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:49,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:51:49,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:49,211 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:49,212 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:49,212 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:49,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [484824429] [2021-11-23 16:51:49,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [484824429] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:49,212 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:49,212 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:51:49,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128151996] [2021-11-23 16:51:49,213 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:49,213 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:51:49,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:49,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:51:49,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:49,214 INFO L87 Difference]: Start difference. First operand 2282 states and 3503 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:49,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:49,280 INFO L93 Difference]: Finished difference Result 2634 states and 4003 transitions. [2021-11-23 16:51:49,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:51:49,281 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-23 16:51:49,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:49,301 INFO L225 Difference]: With dead ends: 2634 [2021-11-23 16:51:49,307 INFO L226 Difference]: Without dead ends: 1936 [2021-11-23 16:51:49,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:49,310 INFO L933 BasicCegarLoop]: 1537 mSDtfsCounter, 28 mSDsluCounter, 1496 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 3033 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:49,310 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 3033 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:51:49,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1936 states. [2021-11-23 16:51:49,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1936 to 1934. [2021-11-23 16:51:49,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1934 states, 1932 states have (on average 1.5512422360248448) internal successors, (2997), 1933 states have internal predecessors, (2997), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:49,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1934 states to 1934 states and 2997 transitions. [2021-11-23 16:51:49,383 INFO L78 Accepts]: Start accepts. Automaton has 1934 states and 2997 transitions. Word has length 66 [2021-11-23 16:51:49,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:49,383 INFO L470 AbstractCegarLoop]: Abstraction has 1934 states and 2997 transitions. [2021-11-23 16:51:49,384 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:49,384 INFO L276 IsEmpty]: Start isEmpty. Operand 1934 states and 2997 transitions. [2021-11-23 16:51:49,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 16:51:49,387 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:49,387 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:49,405 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:49,598 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:49,598 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:49,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:49,599 INFO L85 PathProgramCache]: Analyzing trace with hash 197819318, now seen corresponding path program 1 times [2021-11-23 16:51:49,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:49,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1053673308] [2021-11-23 16:51:49,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:49,600 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:49,600 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:49,601 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:49,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 16:51:49,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:49,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:51:49,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:50,261 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 16:51:50,261 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:50,261 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:50,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1053673308] [2021-11-23 16:51:50,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1053673308] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:50,261 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:50,261 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:51:50,262 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514694854] [2021-11-23 16:51:50,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:50,262 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:51:50,262 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:50,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:51:50,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:51:50,263 INFO L87 Difference]: Start difference. First operand 1934 states and 2997 transitions. Second operand has 6 states, 6 states have (on average 10.5) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:50,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:50,396 INFO L93 Difference]: Finished difference Result 2297 states and 3503 transitions. [2021-11-23 16:51:50,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:51:50,397 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.5) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-23 16:51:50,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:50,409 INFO L225 Difference]: With dead ends: 2297 [2021-11-23 16:51:50,409 INFO L226 Difference]: Without dead ends: 1934 [2021-11-23 16:51:50,411 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:51:50,412 INFO L933 BasicCegarLoop]: 1509 mSDtfsCounter, 1453 mSDsluCounter, 3068 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1453 SdHoareTripleChecker+Valid, 4577 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 27 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:50,413 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1453 Valid, 4577 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 27 Unchecked, 0.0s Time] [2021-11-23 16:51:50,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1934 states. [2021-11-23 16:51:50,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1934 to 1934. [2021-11-23 16:51:50,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1934 states, 1932 states have (on average 1.5507246376811594) internal successors, (2996), 1933 states have internal predecessors, (2996), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:50,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1934 states to 1934 states and 2996 transitions. [2021-11-23 16:51:50,480 INFO L78 Accepts]: Start accepts. Automaton has 1934 states and 2996 transitions. Word has length 66 [2021-11-23 16:51:50,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:50,480 INFO L470 AbstractCegarLoop]: Abstraction has 1934 states and 2996 transitions. [2021-11-23 16:51:50,481 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.5) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:50,481 INFO L276 IsEmpty]: Start isEmpty. Operand 1934 states and 2996 transitions. [2021-11-23 16:51:50,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 16:51:50,486 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:50,486 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:50,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:50,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:50,698 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:50,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:50,699 INFO L85 PathProgramCache]: Analyzing trace with hash 929737398, now seen corresponding path program 1 times [2021-11-23 16:51:50,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:50,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [438218541] [2021-11-23 16:51:50,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:50,699 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:50,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:50,701 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:50,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 16:51:50,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:50,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:51:50,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:51,281 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:51:51,281 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:51,281 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:51,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [438218541] [2021-11-23 16:51:51,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [438218541] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:51,281 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:51,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:51:51,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38775652] [2021-11-23 16:51:51,282 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:51,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:51:51,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:51,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:51:51,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:51:51,283 INFO L87 Difference]: Start difference. First operand 1934 states and 2996 transitions. Second operand has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 5 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:51,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:51,431 INFO L93 Difference]: Finished difference Result 2301 states and 3507 transitions. [2021-11-23 16:51:51,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:51:51,432 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 5 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-23 16:51:51,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:51,437 INFO L225 Difference]: With dead ends: 2301 [2021-11-23 16:51:51,437 INFO L226 Difference]: Without dead ends: 1934 [2021-11-23 16:51:51,438 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:51:51,439 INFO L933 BasicCegarLoop]: 1512 mSDtfsCounter, 1458 mSDsluCounter, 1541 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1458 SdHoareTripleChecker+Valid, 3053 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 11 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:51,440 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1458 Valid, 3053 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 11 Unchecked, 0.1s Time] [2021-11-23 16:51:51,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1934 states. [2021-11-23 16:51:51,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1934 to 1934. [2021-11-23 16:51:51,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1934 states, 1932 states have (on average 1.550207039337474) internal successors, (2995), 1933 states have internal predecessors, (2995), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:51,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1934 states to 1934 states and 2995 transitions. [2021-11-23 16:51:51,516 INFO L78 Accepts]: Start accepts. Automaton has 1934 states and 2995 transitions. Word has length 66 [2021-11-23 16:51:51,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:51,516 INFO L470 AbstractCegarLoop]: Abstraction has 1934 states and 2995 transitions. [2021-11-23 16:51:51,517 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 5 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:51,517 INFO L276 IsEmpty]: Start isEmpty. Operand 1934 states and 2995 transitions. [2021-11-23 16:51:51,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 16:51:51,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:51,518 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:51,537 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:51,730 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:51,730 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:51,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:51,731 INFO L85 PathProgramCache]: Analyzing trace with hash 693852598, now seen corresponding path program 1 times [2021-11-23 16:51:51,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:51,732 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1360079112] [2021-11-23 16:51:51,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:51,732 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:51,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:51,733 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:51,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 16:51:51,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:51,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:51:51,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:52,262 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:51:52,262 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:52,262 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:52,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1360079112] [2021-11-23 16:51:52,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1360079112] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:52,263 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:52,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:51:52,263 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894143368] [2021-11-23 16:51:52,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:52,263 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:51:52,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:52,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:51:52,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:51:52,265 INFO L87 Difference]: Start difference. First operand 1934 states and 2995 transitions. Second operand has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:52,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:52,422 INFO L93 Difference]: Finished difference Result 2284 states and 3488 transitions. [2021-11-23 16:51:52,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:51:52,423 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-23 16:51:52,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:52,428 INFO L225 Difference]: With dead ends: 2284 [2021-11-23 16:51:52,428 INFO L226 Difference]: Without dead ends: 1913 [2021-11-23 16:51:52,431 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:51:52,432 INFO L933 BasicCegarLoop]: 1515 mSDtfsCounter, 1456 mSDsluCounter, 1575 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1456 SdHoareTripleChecker+Valid, 3090 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:52,432 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1456 Valid, 3090 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 26 Unchecked, 0.1s Time] [2021-11-23 16:51:52,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1913 states. [2021-11-23 16:51:52,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1913 to 1913. [2021-11-23 16:51:52,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1913 states, 1911 states have (on average 1.554683411826269) internal successors, (2971), 1912 states have internal predecessors, (2971), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:52,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1913 states to 1913 states and 2971 transitions. [2021-11-23 16:51:52,487 INFO L78 Accepts]: Start accepts. Automaton has 1913 states and 2971 transitions. Word has length 66 [2021-11-23 16:51:52,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:52,487 INFO L470 AbstractCegarLoop]: Abstraction has 1913 states and 2971 transitions. [2021-11-23 16:51:52,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:52,488 INFO L276 IsEmpty]: Start isEmpty. Operand 1913 states and 2971 transitions. [2021-11-23 16:51:52,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 16:51:52,489 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:52,489 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:52,505 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:52,701 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:52,702 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:52,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:52,708 INFO L85 PathProgramCache]: Analyzing trace with hash 188776423, now seen corresponding path program 1 times [2021-11-23 16:51:52,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:52,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [67238407] [2021-11-23 16:51:52,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:52,710 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:52,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:52,711 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:52,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 16:51:52,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:52,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:52,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:54,323 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:54,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:54,960 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:54,960 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:54,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [67238407] [2021-11-23 16:51:54,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [67238407] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:54,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [313939378] [2021-11-23 16:51:54,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:54,961 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:54,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:51:54,972 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:51:54,973 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-23 16:51:55,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:55,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:55,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:56,471 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:56,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:57,019 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:57,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [313939378] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:57,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1104284190] [2021-11-23 16:51:57,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:57,019 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:57,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:51:57,020 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:51:57,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 16:51:57,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:57,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:57,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:58,417 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:58,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:58,915 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:58,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1104284190] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:58,916 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:51:58,916 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:51:58,916 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933243107] [2021-11-23 16:51:58,916 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:51:58,917 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:51:58,917 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:58,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:51:58,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:51:58,917 INFO L87 Difference]: Start difference. First operand 1913 states and 2971 transitions. Second operand has 16 states, 16 states have (on average 7.9375) internal successors, (127), 15 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:59,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:59,203 INFO L93 Difference]: Finished difference Result 2277 states and 3488 transitions. [2021-11-23 16:51:59,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 16:51:59,203 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.9375) internal successors, (127), 15 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-23 16:51:59,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:59,208 INFO L225 Difference]: With dead ends: 2277 [2021-11-23 16:51:59,208 INFO L226 Difference]: Without dead ends: 1927 [2021-11-23 16:51:59,210 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 382 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-11-23 16:51:59,210 INFO L933 BasicCegarLoop]: 1503 mSDtfsCounter, 5855 mSDsluCounter, 10607 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5855 SdHoareTripleChecker+Valid, 12110 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 61 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:59,211 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5855 Valid, 12110 Invalid, 94 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [3 Valid, 30 Invalid, 0 Unknown, 61 Unchecked, 0.1s Time] [2021-11-23 16:51:59,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1927 states. [2021-11-23 16:51:59,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1927 to 1925. [2021-11-23 16:51:59,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1925 states, 1923 states have (on average 1.5543421736869474) internal successors, (2989), 1924 states have internal predecessors, (2989), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:59,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1925 states to 1925 states and 2989 transitions. [2021-11-23 16:51:59,264 INFO L78 Accepts]: Start accepts. Automaton has 1925 states and 2989 transitions. Word has length 67 [2021-11-23 16:51:59,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:59,264 INFO L470 AbstractCegarLoop]: Abstraction has 1925 states and 2989 transitions. [2021-11-23 16:51:59,265 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.9375) internal successors, (127), 15 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:59,265 INFO L276 IsEmpty]: Start isEmpty. Operand 1925 states and 2989 transitions. [2021-11-23 16:51:59,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 16:51:59,266 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:59,266 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:59,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:59,515 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:59,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:59,886 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:59,886 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:59,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:59,887 INFO L85 PathProgramCache]: Analyzing trace with hash 1406761821, now seen corresponding path program 1 times [2021-11-23 16:51:59,887 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:59,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [508258082] [2021-11-23 16:51:59,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:59,887 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:59,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:59,889 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:59,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 16:51:59,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:59,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:51:59,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:00,142 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:00,143 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:00,143 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:00,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [508258082] [2021-11-23 16:52:00,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [508258082] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:00,143 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:00,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:52:00,144 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212808528] [2021-11-23 16:52:00,144 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:00,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:52:00,144 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:00,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:52:00,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:52:00,145 INFO L87 Difference]: Start difference. First operand 1925 states and 2989 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:00,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:00,195 INFO L93 Difference]: Finished difference Result 2103 states and 3237 transitions. [2021-11-23 16:52:00,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:52:00,196 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-23 16:52:00,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:00,200 INFO L225 Difference]: With dead ends: 2103 [2021-11-23 16:52:00,200 INFO L226 Difference]: Without dead ends: 1753 [2021-11-23 16:52:00,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:52:00,203 INFO L933 BasicCegarLoop]: 1530 mSDtfsCounter, 23 mSDsluCounter, 1488 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 3018 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:00,204 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 3018 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:52:00,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1753 states. [2021-11-23 16:52:00,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1753 to 1751. [2021-11-23 16:52:00,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1751 states, 1749 states have (on average 1.5654659805603202) internal successors, (2738), 1750 states have internal predecessors, (2738), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:00,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1751 states to 1751 states and 2738 transitions. [2021-11-23 16:52:00,248 INFO L78 Accepts]: Start accepts. Automaton has 1751 states and 2738 transitions. Word has length 67 [2021-11-23 16:52:00,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:00,249 INFO L470 AbstractCegarLoop]: Abstraction has 1751 states and 2738 transitions. [2021-11-23 16:52:00,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:00,249 INFO L276 IsEmpty]: Start isEmpty. Operand 1751 states and 2738 transitions. [2021-11-23 16:52:00,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 16:52:00,250 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:00,250 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:00,266 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:00,463 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:00,463 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:00,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:00,464 INFO L85 PathProgramCache]: Analyzing trace with hash -225708405, now seen corresponding path program 1 times [2021-11-23 16:52:00,464 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:00,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1645492455] [2021-11-23 16:52:00,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:00,465 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:00,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:00,466 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:00,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 16:52:00,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:00,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:52:00,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:01,063 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:52:01,064 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:01,064 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:01,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1645492455] [2021-11-23 16:52:01,064 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1645492455] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:01,064 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:01,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:52:01,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651796121] [2021-11-23 16:52:01,065 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:01,065 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:52:01,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:01,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:52:01,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:52:01,066 INFO L87 Difference]: Start difference. First operand 1751 states and 2738 transitions. Second operand has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:01,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:01,190 INFO L93 Difference]: Finished difference Result 1995 states and 3072 transitions. [2021-11-23 16:52:01,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:52:01,190 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-23 16:52:01,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:01,193 INFO L225 Difference]: With dead ends: 1995 [2021-11-23 16:52:01,193 INFO L226 Difference]: Without dead ends: 1819 [2021-11-23 16:52:01,194 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:52:01,195 INFO L933 BasicCegarLoop]: 1576 mSDtfsCounter, 3069 mSDsluCounter, 1621 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3069 SdHoareTripleChecker+Valid, 3197 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:01,195 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3069 Valid, 3197 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:52:01,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1819 states. [2021-11-23 16:52:01,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1819 to 1751. [2021-11-23 16:52:01,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1751 states, 1749 states have (on average 1.5620354488279016) internal successors, (2732), 1750 states have internal predecessors, (2732), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:01,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1751 states to 1751 states and 2732 transitions. [2021-11-23 16:52:01,240 INFO L78 Accepts]: Start accepts. Automaton has 1751 states and 2732 transitions. Word has length 68 [2021-11-23 16:52:01,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:01,240 INFO L470 AbstractCegarLoop]: Abstraction has 1751 states and 2732 transitions. [2021-11-23 16:52:01,240 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:01,241 INFO L276 IsEmpty]: Start isEmpty. Operand 1751 states and 2732 transitions. [2021-11-23 16:52:01,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 16:52:01,242 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:01,242 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:01,254 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Ended with exit code 0 [2021-11-23 16:52:01,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:01,454 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:01,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:01,455 INFO L85 PathProgramCache]: Analyzing trace with hash 1276650702, now seen corresponding path program 1 times [2021-11-23 16:52:01,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:01,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [151588238] [2021-11-23 16:52:01,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:01,456 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:01,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:01,456 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:01,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 16:52:01,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:01,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:52:01,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:02,032 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:52:02,033 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:02,033 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:02,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [151588238] [2021-11-23 16:52:02,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [151588238] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:02,033 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:02,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:52:02,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518006434] [2021-11-23 16:52:02,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:02,034 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:52:02,034 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:02,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:52:02,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:52:02,035 INFO L87 Difference]: Start difference. First operand 1751 states and 2732 transitions. Second operand has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:02,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:02,161 INFO L93 Difference]: Finished difference Result 1937 states and 2989 transitions. [2021-11-23 16:52:02,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:52:02,162 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-23 16:52:02,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:02,164 INFO L225 Difference]: With dead ends: 1937 [2021-11-23 16:52:02,164 INFO L226 Difference]: Without dead ends: 1877 [2021-11-23 16:52:02,165 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:52:02,166 INFO L933 BasicCegarLoop]: 1583 mSDtfsCounter, 3067 mSDsluCounter, 1610 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3067 SdHoareTripleChecker+Valid, 3193 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:02,166 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3067 Valid, 3193 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:52:02,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1877 states. [2021-11-23 16:52:02,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1877 to 1813. [2021-11-23 16:52:02,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1813 states, 1811 states have (on average 1.553285477636665) internal successors, (2813), 1812 states have internal predecessors, (2813), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:02,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1813 states to 1813 states and 2813 transitions. [2021-11-23 16:52:02,213 INFO L78 Accepts]: Start accepts. Automaton has 1813 states and 2813 transitions. Word has length 68 [2021-11-23 16:52:02,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:02,214 INFO L470 AbstractCegarLoop]: Abstraction has 1813 states and 2813 transitions. [2021-11-23 16:52:02,214 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:02,214 INFO L276 IsEmpty]: Start isEmpty. Operand 1813 states and 2813 transitions. [2021-11-23 16:52:02,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 16:52:02,215 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:02,216 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:02,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:02,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:02,430 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:02,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:02,430 INFO L85 PathProgramCache]: Analyzing trace with hash -78813077, now seen corresponding path program 1 times [2021-11-23 16:52:02,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:02,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1726836240] [2021-11-23 16:52:02,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:02,431 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:02,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:02,432 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:02,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 16:52:02,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:02,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:52:02,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:02,998 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:52:02,999 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:02,999 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:02,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1726836240] [2021-11-23 16:52:02,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1726836240] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:02,999 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:02,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:52:02,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006216057] [2021-11-23 16:52:02,999 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:03,000 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:52:03,000 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:03,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:52:03,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:52:03,001 INFO L87 Difference]: Start difference. First operand 1813 states and 2813 transitions. Second operand has 5 states, 5 states have (on average 13.4) internal successors, (67), 5 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:03,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:03,119 INFO L93 Difference]: Finished difference Result 1999 states and 3070 transitions. [2021-11-23 16:52:03,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:52:03,120 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.4) internal successors, (67), 5 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-23 16:52:03,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:03,123 INFO L225 Difference]: With dead ends: 1999 [2021-11-23 16:52:03,124 INFO L226 Difference]: Without dead ends: 1939 [2021-11-23 16:52:03,125 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:52:03,125 INFO L933 BasicCegarLoop]: 1580 mSDtfsCounter, 3066 mSDsluCounter, 1610 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3066 SdHoareTripleChecker+Valid, 3190 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:03,126 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3066 Valid, 3190 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:52:03,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1939 states. [2021-11-23 16:52:03,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1939 to 1875. [2021-11-23 16:52:03,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1875 states, 1873 states have (on average 1.5451147891083823) internal successors, (2894), 1874 states have internal predecessors, (2894), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:03,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1875 states to 1875 states and 2894 transitions. [2021-11-23 16:52:03,174 INFO L78 Accepts]: Start accepts. Automaton has 1875 states and 2894 transitions. Word has length 68 [2021-11-23 16:52:03,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:03,175 INFO L470 AbstractCegarLoop]: Abstraction has 1875 states and 2894 transitions. [2021-11-23 16:52:03,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.4) internal successors, (67), 5 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:03,175 INFO L276 IsEmpty]: Start isEmpty. Operand 1875 states and 2894 transitions. [2021-11-23 16:52:03,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 16:52:03,176 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:03,176 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:03,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:03,386 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:03,386 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:03,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:03,386 INFO L85 PathProgramCache]: Analyzing trace with hash -576881103, now seen corresponding path program 1 times [2021-11-23 16:52:03,386 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:03,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [675295930] [2021-11-23 16:52:03,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:03,387 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:03,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:03,387 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:03,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 16:52:03,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:03,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:52:03,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:07,394 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:07,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:09,572 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:09,573 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:09,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [675295930] [2021-11-23 16:52:09,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [675295930] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:09,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [492845456] [2021-11-23 16:52:09,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:09,573 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:09,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:09,574 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:09,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-23 16:52:09,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:09,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 16:52:09,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:12,142 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:12,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:13,000 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:13,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [492845456] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:13,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758371082] [2021-11-23 16:52:13,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:13,001 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:13,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:13,006 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:13,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-23 16:52:13,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:13,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 16:52:13,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:16,644 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:16,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:17,786 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:17,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1758371082] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:17,787 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:17,787 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 21, 20, 18, 17] total 55 [2021-11-23 16:52:17,787 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55416598] [2021-11-23 16:52:17,787 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:17,788 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 16:52:17,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:17,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 16:52:17,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=2613, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 16:52:17,791 INFO L87 Difference]: Start difference. First operand 1875 states and 2894 transitions. Second operand has 55 states, 55 states have (on average 3.5272727272727273) internal successors, (194), 55 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:18,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:18,208 INFO L93 Difference]: Finished difference Result 2003 states and 3067 transitions. [2021-11-23 16:52:18,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 16:52:18,209 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.5272727272727273) internal successors, (194), 55 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-23 16:52:18,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:18,211 INFO L225 Difference]: With dead ends: 2003 [2021-11-23 16:52:18,212 INFO L226 Difference]: Without dead ends: 1881 [2021-11-23 16:52:18,213 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 356 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1239 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=403, Invalid=2789, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 16:52:18,214 INFO L933 BasicCegarLoop]: 1500 mSDtfsCounter, 7307 mSDsluCounter, 31385 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7307 SdHoareTripleChecker+Valid, 32885 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 172 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:18,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7307 Valid, 32885 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 61 Invalid, 0 Unknown, 172 Unchecked, 0.1s Time] [2021-11-23 16:52:18,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1881 states. [2021-11-23 16:52:18,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1881 to 1881. [2021-11-23 16:52:18,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1881 states, 1879 states have (on average 1.543906333155934) internal successors, (2901), 1880 states have internal predecessors, (2901), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:18,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1881 states to 1881 states and 2901 transitions. [2021-11-23 16:52:18,265 INFO L78 Accepts]: Start accepts. Automaton has 1881 states and 2901 transitions. Word has length 69 [2021-11-23 16:52:18,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:18,265 INFO L470 AbstractCegarLoop]: Abstraction has 1881 states and 2901 transitions. [2021-11-23 16:52:18,266 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.5272727272727273) internal successors, (194), 55 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:18,266 INFO L276 IsEmpty]: Start isEmpty. Operand 1881 states and 2901 transitions. [2021-11-23 16:52:18,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 16:52:18,267 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:18,267 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:18,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:18,489 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2021-11-23 16:52:18,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:18,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:18,870 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:18,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:18,870 INFO L85 PathProgramCache]: Analyzing trace with hash 353414708, now seen corresponding path program 1 times [2021-11-23 16:52:18,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:18,870 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [793758031] [2021-11-23 16:52:18,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:18,871 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:18,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:18,871 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:18,873 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 16:52:18,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:18,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:52:18,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:21,527 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:21,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:23,023 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:23,023 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:23,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [793758031] [2021-11-23 16:52:23,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [793758031] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:23,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [628060717] [2021-11-23 16:52:23,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:23,024 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:23,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:23,030 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:23,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-23 16:52:23,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:23,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 16:52:23,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:25,134 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:25,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:25,803 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:25,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [628060717] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:25,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [985016773] [2021-11-23 16:52:25,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:25,803 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:25,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:25,810 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:25,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-23 16:52:25,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:25,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 16:52:25,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:28,934 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:28,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:30,278 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:30,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [985016773] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:30,278 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:30,279 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 20, 18, 18, 18] total 55 [2021-11-23 16:52:30,279 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628865075] [2021-11-23 16:52:30,279 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:30,280 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 16:52:30,280 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:30,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 16:52:30,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=2600, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 16:52:30,283 INFO L87 Difference]: Start difference. First operand 1881 states and 2901 transitions. Second operand has 55 states, 55 states have (on average 3.6) internal successors, (198), 55 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:30,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:30,960 INFO L93 Difference]: Finished difference Result 2017 states and 3080 transitions. [2021-11-23 16:52:30,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 16:52:30,962 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.6) internal successors, (198), 55 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-23 16:52:30,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:30,966 INFO L225 Difference]: With dead ends: 2017 [2021-11-23 16:52:30,966 INFO L226 Difference]: Without dead ends: 1885 [2021-11-23 16:52:30,968 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 410 GetRequests, 355 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1389 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=427, Invalid=2765, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 16:52:30,968 INFO L933 BasicCegarLoop]: 1503 mSDtfsCounter, 1563 mSDsluCounter, 29862 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1563 SdHoareTripleChecker+Valid, 31365 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 131 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:30,969 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1563 Valid, 31365 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 189 Invalid, 0 Unknown, 131 Unchecked, 0.3s Time] [2021-11-23 16:52:30,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1885 states. [2021-11-23 16:52:31,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1885 to 1867. [2021-11-23 16:52:31,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1867 states, 1865 states have (on average 1.5463806970509384) internal successors, (2884), 1866 states have internal predecessors, (2884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:31,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1867 states to 1867 states and 2884 transitions. [2021-11-23 16:52:31,017 INFO L78 Accepts]: Start accepts. Automaton has 1867 states and 2884 transitions. Word has length 69 [2021-11-23 16:52:31,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:31,017 INFO L470 AbstractCegarLoop]: Abstraction has 1867 states and 2884 transitions. [2021-11-23 16:52:31,017 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.6) internal successors, (198), 55 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:31,018 INFO L276 IsEmpty]: Start isEmpty. Operand 1867 states and 2884 transitions. [2021-11-23 16:52:31,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 16:52:31,019 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:31,019 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:31,031 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Ended with exit code 0 [2021-11-23 16:52:31,236 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:31,452 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2021-11-23 16:52:31,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:31,632 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:31,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:31,633 INFO L85 PathProgramCache]: Analyzing trace with hash -1947028966, now seen corresponding path program 1 times [2021-11-23 16:52:31,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:31,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1570772673] [2021-11-23 16:52:31,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:31,633 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:31,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:31,634 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:31,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 16:52:31,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:31,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:52:31,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:32,046 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:52:32,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:32,340 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:52:32,340 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:32,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1570772673] [2021-11-23 16:52:32,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1570772673] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:32,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1305930254] [2021-11-23 16:52:32,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:32,341 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:32,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:32,346 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:32,366 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-23 16:52:32,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:32,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:52:32,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:32,806 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:52:32,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:33,022 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:52:33,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1305930254] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:33,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568792345] [2021-11-23 16:52:33,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:33,023 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:33,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:33,024 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:33,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-23 16:52:33,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:33,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:52:33,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:33,378 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:52:33,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:33,742 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:33,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568792345] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:33,742 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:33,742 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 5] total 7 [2021-11-23 16:52:33,742 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177213784] [2021-11-23 16:52:33,743 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:33,743 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 16:52:33,743 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:33,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 16:52:33,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:52:33,744 INFO L87 Difference]: Start difference. First operand 1867 states and 2884 transitions. Second operand has 7 states, 7 states have (on average 23.714285714285715) internal successors, (166), 7 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:33,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:33,875 INFO L93 Difference]: Finished difference Result 2744 states and 4034 transitions. [2021-11-23 16:52:33,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 16:52:33,876 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 23.714285714285715) internal successors, (166), 7 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-23 16:52:33,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:33,880 INFO L225 Difference]: With dead ends: 2744 [2021-11-23 16:52:33,881 INFO L226 Difference]: Without dead ends: 2452 [2021-11-23 16:52:33,882 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 406 SyntacticMatches, 4 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:52:33,883 INFO L933 BasicCegarLoop]: 1538 mSDtfsCounter, 1683 mSDsluCounter, 1687 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1683 SdHoareTripleChecker+Valid, 3225 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 13 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:33,883 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1683 Valid, 3225 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 32 Invalid, 0 Unknown, 13 Unchecked, 0.1s Time] [2021-11-23 16:52:33,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2452 states. [2021-11-23 16:52:33,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2452 to 2363. [2021-11-23 16:52:33,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2363 states, 2361 states have (on average 1.4896230410842863) internal successors, (3517), 2362 states have internal predecessors, (3517), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:33,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2363 states to 2363 states and 3517 transitions. [2021-11-23 16:52:33,963 INFO L78 Accepts]: Start accepts. Automaton has 2363 states and 3517 transitions. Word has length 70 [2021-11-23 16:52:33,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:33,964 INFO L470 AbstractCegarLoop]: Abstraction has 2363 states and 3517 transitions. [2021-11-23 16:52:33,964 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 23.714285714285715) internal successors, (166), 7 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:33,964 INFO L276 IsEmpty]: Start isEmpty. Operand 2363 states and 3517 transitions. [2021-11-23 16:52:33,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 16:52:33,965 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:33,965 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:33,967 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (35)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:34,175 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Ended with exit code 0 [2021-11-23 16:52:34,387 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2021-11-23 16:52:34,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:34,567 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:34,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:34,568 INFO L85 PathProgramCache]: Analyzing trace with hash 788347971, now seen corresponding path program 1 times [2021-11-23 16:52:34,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:34,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [447372192] [2021-11-23 16:52:34,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:34,568 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:34,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:34,569 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:34,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 16:52:34,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:34,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 16:52:34,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:38,785 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:38,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:41,645 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:41,646 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:41,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [447372192] [2021-11-23 16:52:41,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [447372192] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:41,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [369899281] [2021-11-23 16:52:41,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:41,646 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:41,646 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:41,647 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:41,648 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-23 16:52:41,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:41,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:52:41,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:44,558 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:44,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:45,428 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:45,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [369899281] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:45,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2081026785] [2021-11-23 16:52:45,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:45,429 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:45,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:45,430 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:45,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-23 16:52:45,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:45,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 16:52:45,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:47,710 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:47,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:48,479 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:48,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2081026785] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:48,480 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:48,480 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18, 11, 9, 21, 18] total 51 [2021-11-23 16:52:48,480 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132930159] [2021-11-23 16:52:48,480 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:48,481 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 16:52:48,481 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:48,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 16:52:48,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=2245, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 16:52:48,483 INFO L87 Difference]: Start difference. First operand 2363 states and 3517 transitions. Second operand has 51 states, 51 states have (on average 4.411764705882353) internal successors, (225), 51 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:49,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:49,347 INFO L93 Difference]: Finished difference Result 2693 states and 3943 transitions. [2021-11-23 16:52:49,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 16:52:49,347 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 4.411764705882353) internal successors, (225), 51 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-23 16:52:49,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:49,351 INFO L225 Difference]: With dead ends: 2693 [2021-11-23 16:52:49,351 INFO L226 Difference]: Without dead ends: 2389 [2021-11-23 16:52:49,354 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 366 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 995 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=350, Invalid=2406, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 16:52:49,354 INFO L933 BasicCegarLoop]: 1497 mSDtfsCounter, 10214 mSDsluCounter, 22568 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10214 SdHoareTripleChecker+Valid, 24065 SdHoareTripleChecker+Invalid, 358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 113 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:49,355 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10214 Valid, 24065 Invalid, 358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 233 Invalid, 0 Unknown, 113 Unchecked, 0.4s Time] [2021-11-23 16:52:49,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2389 states. [2021-11-23 16:52:49,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2389 to 2369. [2021-11-23 16:52:49,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2369 states, 2367 states have (on average 1.4888043937473596) internal successors, (3524), 2368 states have internal predecessors, (3524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:49,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2369 states to 2369 states and 3524 transitions. [2021-11-23 16:52:49,433 INFO L78 Accepts]: Start accepts. Automaton has 2369 states and 3524 transitions. Word has length 70 [2021-11-23 16:52:49,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:49,433 INFO L470 AbstractCegarLoop]: Abstraction has 2369 states and 3524 transitions. [2021-11-23 16:52:49,433 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 4.411764705882353) internal successors, (225), 51 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:49,434 INFO L276 IsEmpty]: Start isEmpty. Operand 2369 states and 3524 transitions. [2021-11-23 16:52:49,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 16:52:49,435 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:49,435 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:49,447 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Ended with exit code 0 [2021-11-23 16:52:49,649 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Ended with exit code 0 [2021-11-23 16:52:49,872 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2021-11-23 16:52:50,047 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:50,048 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:50,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:50,048 INFO L85 PathProgramCache]: Analyzing trace with hash -621582234, now seen corresponding path program 1 times [2021-11-23 16:52:50,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:50,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1559031635] [2021-11-23 16:52:50,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:50,049 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:50,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:50,050 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:50,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-23 16:52:50,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:50,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 16:52:50,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:53,650 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:53,650 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:56,057 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:56,057 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:56,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1559031635] [2021-11-23 16:52:56,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1559031635] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:56,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1058172991] [2021-11-23 16:52:56,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:56,057 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:56,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:56,058 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:56,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-23 16:52:56,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:56,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 16:52:56,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:58,773 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:58,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:00,896 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:00,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1058172991] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:00,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016085082] [2021-11-23 16:53:00,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:00,897 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:00,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:53:00,897 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:53:00,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-23 16:53:00,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:00,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 16:53:00,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:04,399 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:04,399 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:05,800 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:05,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016085082] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:05,800 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:53:05,800 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 22, 20, 16, 15] total 72 [2021-11-23 16:53:05,801 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723380758] [2021-11-23 16:53:05,801 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:53:05,802 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-23 16:53:05,802 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:05,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-23 16:53:05,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=696, Invalid=4416, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 16:53:05,804 INFO L87 Difference]: Start difference. First operand 2369 states and 3524 transitions. Second operand has 72 states, 72 states have (on average 3.513888888888889) internal successors, (253), 72 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:07,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:07,447 INFO L93 Difference]: Finished difference Result 3118 states and 4457 transitions. [2021-11-23 16:53:07,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 16:53:07,448 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 3.513888888888889) internal successors, (253), 72 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-23 16:53:07,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:07,451 INFO L225 Difference]: With dead ends: 3118 [2021-11-23 16:53:07,451 INFO L226 Difference]: Without dead ends: 2607 [2021-11-23 16:53:07,453 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 344 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2566 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=822, Invalid=4728, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 16:53:07,454 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 18995 mSDsluCounter, 29042 mSDsCounter, 0 mSdLazyCounter, 601 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18995 SdHoareTripleChecker+Valid, 30571 SdHoareTripleChecker+Invalid, 880 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 601 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 242 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:07,454 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18995 Valid, 30571 Invalid, 880 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [37 Valid, 601 Invalid, 0 Unknown, 242 Unchecked, 1.0s Time] [2021-11-23 16:53:07,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2607 states. [2021-11-23 16:53:07,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2607 to 2280. [2021-11-23 16:53:07,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2280 states, 2278 states have (on average 1.4956101843722565) internal successors, (3407), 2279 states have internal predecessors, (3407), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:07,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2280 states to 2280 states and 3407 transitions. [2021-11-23 16:53:07,508 INFO L78 Accepts]: Start accepts. Automaton has 2280 states and 3407 transitions. Word has length 70 [2021-11-23 16:53:07,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:07,508 INFO L470 AbstractCegarLoop]: Abstraction has 2280 states and 3407 transitions. [2021-11-23 16:53:07,509 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 3.513888888888889) internal successors, (253), 72 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:07,509 INFO L276 IsEmpty]: Start isEmpty. Operand 2280 states and 3407 transitions. [2021-11-23 16:53:07,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 16:53:07,510 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:07,510 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:07,531 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2021-11-23 16:53:07,719 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Ended with exit code 0 [2021-11-23 16:53:07,921 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (41)] Ended with exit code 0 [2021-11-23 16:53:08,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:08,111 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:08,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:08,112 INFO L85 PathProgramCache]: Analyzing trace with hash 2076613891, now seen corresponding path program 1 times [2021-11-23 16:53:08,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:08,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1339692319] [2021-11-23 16:53:08,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:08,112 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:08,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:08,113 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:08,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-23 16:53:08,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:08,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:53:08,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:08,460 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:53:08,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:08,692 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:53:08,692 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:08,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1339692319] [2021-11-23 16:53:08,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1339692319] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:08,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1894581118] [2021-11-23 16:53:08,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:08,693 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:08,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:53:08,694 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:53:08,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-23 16:53:08,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:08,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:53:08,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:08,872 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:53:08,872 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:53:08,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1894581118] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:53:08,873 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:53:08,873 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 16:53:08,873 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633923432] [2021-11-23 16:53:08,873 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:53:08,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:53:08,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:08,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:53:08,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:53:08,874 INFO L87 Difference]: Start difference. First operand 2280 states and 3407 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:08,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:08,948 INFO L93 Difference]: Finished difference Result 2982 states and 4314 transitions. [2021-11-23 16:53:08,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:53:08,948 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-23 16:53:08,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:08,951 INFO L225 Difference]: With dead ends: 2982 [2021-11-23 16:53:08,952 INFO L226 Difference]: Without dead ends: 2305 [2021-11-23 16:53:08,953 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 205 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:53:08,954 INFO L933 BasicCegarLoop]: 1517 mSDtfsCounter, 1486 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1486 SdHoareTripleChecker+Valid, 1567 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:08,955 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1486 Valid, 1567 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:53:08,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2305 states. [2021-11-23 16:53:09,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2305 to 2281. [2021-11-23 16:53:09,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2281 states, 2279 states have (on average 1.4901272487933304) internal successors, (3396), 2280 states have internal predecessors, (3396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:09,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2281 states to 2281 states and 3396 transitions. [2021-11-23 16:53:09,035 INFO L78 Accepts]: Start accepts. Automaton has 2281 states and 3396 transitions. Word has length 71 [2021-11-23 16:53:09,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:09,035 INFO L470 AbstractCegarLoop]: Abstraction has 2281 states and 3396 transitions. [2021-11-23 16:53:09,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:09,035 INFO L276 IsEmpty]: Start isEmpty. Operand 2281 states and 3396 transitions. [2021-11-23 16:53:09,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 16:53:09,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:09,037 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:09,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:09,250 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (44)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:09,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:09,449 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:09,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:09,450 INFO L85 PathProgramCache]: Analyzing trace with hash 1592733223, now seen corresponding path program 1 times [2021-11-23 16:53:09,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:09,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1230559472] [2021-11-23 16:53:09,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:09,450 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:09,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:09,451 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:09,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-23 16:53:09,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:09,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:53:09,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:11,103 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:11,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:11,541 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:11,541 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:11,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1230559472] [2021-11-23 16:53:11,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1230559472] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:11,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1505276364] [2021-11-23 16:53:11,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:11,542 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:11,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:53:11,543 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:53:11,546 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-23 16:53:11,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:11,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:53:11,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:13,355 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:13,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:13,596 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:13,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1505276364] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:13,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [629329781] [2021-11-23 16:53:13,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:13,596 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:13,596 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:53:13,597 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:53:13,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-23 16:53:13,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:13,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:53:13,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:15,126 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:15,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:15,378 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:15,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [629329781] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:15,378 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:53:15,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 10, 9] total 18 [2021-11-23 16:53:15,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668134245] [2021-11-23 16:53:15,378 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:53:15,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 16:53:15,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:15,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 16:53:15,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 16:53:15,380 INFO L87 Difference]: Start difference. First operand 2281 states and 3396 transitions. Second operand has 18 states, 18 states have (on average 7.055555555555555) internal successors, (127), 18 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:15,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:15,582 INFO L93 Difference]: Finished difference Result 2591 states and 3798 transitions. [2021-11-23 16:53:15,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:53:15,583 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 7.055555555555555) internal successors, (127), 18 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-23 16:53:15,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:15,585 INFO L225 Difference]: With dead ends: 2591 [2021-11-23 16:53:15,585 INFO L226 Difference]: Without dead ends: 2273 [2021-11-23 16:53:15,586 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 404 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-11-23 16:53:15,587 INFO L933 BasicCegarLoop]: 1510 mSDtfsCounter, 4368 mSDsluCounter, 10673 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4368 SdHoareTripleChecker+Valid, 12183 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:15,587 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4368 Valid, 12183 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 61 Invalid, 0 Unknown, 51 Unchecked, 0.1s Time] [2021-11-23 16:53:15,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2273 states. [2021-11-23 16:53:15,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2273 to 2267. [2021-11-23 16:53:15,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2267 states, 2265 states have (on average 1.491832229580574) internal successors, (3379), 2266 states have internal predecessors, (3379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:15,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2267 states to 2267 states and 3379 transitions. [2021-11-23 16:53:15,668 INFO L78 Accepts]: Start accepts. Automaton has 2267 states and 3379 transitions. Word has length 71 [2021-11-23 16:53:15,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:15,668 INFO L470 AbstractCegarLoop]: Abstraction has 2267 states and 3379 transitions. [2021-11-23 16:53:15,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 7.055555555555555) internal successors, (127), 18 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:15,669 INFO L276 IsEmpty]: Start isEmpty. Operand 2267 states and 3379 transitions. [2021-11-23 16:53:15,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-23 16:53:15,670 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:15,670 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:15,686 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:15,885 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Ended with exit code 0 [2021-11-23 16:53:16,104 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2021-11-23 16:53:16,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:16,284 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:16,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:16,285 INFO L85 PathProgramCache]: Analyzing trace with hash -1277881614, now seen corresponding path program 1 times [2021-11-23 16:53:16,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:16,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [204788568] [2021-11-23 16:53:16,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:16,285 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:16,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:16,286 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:16,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 16:53:16,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:16,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:53:16,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:16,641 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:16,642 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:53:16,642 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:16,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [204788568] [2021-11-23 16:53:16,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [204788568] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:53:16,642 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:53:16,642 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:53:16,642 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534930774] [2021-11-23 16:53:16,642 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:53:16,643 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:53:16,643 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:16,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:53:16,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:53:16,643 INFO L87 Difference]: Start difference. First operand 2267 states and 3379 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:56,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:56,618 INFO L93 Difference]: Finished difference Result 5273 states and 8210 transitions. [2021-11-23 16:53:56,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:53:56,619 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 88 [2021-11-23 16:53:56,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:56,622 INFO L225 Difference]: With dead ends: 5273 [2021-11-23 16:53:56,622 INFO L226 Difference]: Without dead ends: 3769 [2021-11-23 16:53:56,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:53:56,624 INFO L933 BasicCegarLoop]: 689 mSDtfsCounter, 781 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2413 mSolverCounterSat, 591 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 781 SdHoareTripleChecker+Valid, 696 SdHoareTripleChecker+Invalid, 3004 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 591 IncrementalHoareTripleChecker+Valid, 2413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 39.8s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:56,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [781 Valid, 696 Invalid, 3004 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [591 Valid, 2413 Invalid, 0 Unknown, 0 Unchecked, 39.8s Time] [2021-11-23 16:53:56,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3769 states. [2021-11-23 16:53:56,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3769 to 3769. [2021-11-23 16:53:56,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3769 states, 3767 states have (on average 1.3928855853464295) internal successors, (5247), 3768 states have internal predecessors, (5247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:56,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3769 states to 3769 states and 5247 transitions. [2021-11-23 16:53:56,726 INFO L78 Accepts]: Start accepts. Automaton has 3769 states and 5247 transitions. Word has length 88 [2021-11-23 16:53:56,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:56,727 INFO L470 AbstractCegarLoop]: Abstraction has 3769 states and 5247 transitions. [2021-11-23 16:53:56,727 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:56,727 INFO L276 IsEmpty]: Start isEmpty. Operand 3769 states and 5247 transitions. [2021-11-23 16:53:56,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 16:53:56,728 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:56,729 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:56,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:56,941 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:53:56,941 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:56,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:56,942 INFO L85 PathProgramCache]: Analyzing trace with hash 1599820939, now seen corresponding path program 1 times [2021-11-23 16:53:56,942 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:56,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [837485239] [2021-11-23 16:53:56,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:56,943 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:56,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:56,944 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:56,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-23 16:53:57,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:57,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:53:57,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:57,303 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:57,304 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:53:57,304 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:57,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [837485239] [2021-11-23 16:53:57,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [837485239] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:53:57,304 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:53:57,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:53:57,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116822745] [2021-11-23 16:53:57,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:53:57,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:53:57,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:57,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:53:57,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:53:57,306 INFO L87 Difference]: Start difference. First operand 3769 states and 5247 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:39,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:39,028 INFO L93 Difference]: Finished difference Result 9781 states and 13815 transitions. [2021-11-23 16:54:39,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:54:39,029 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2021-11-23 16:54:39,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:39,035 INFO L225 Difference]: With dead ends: 9781 [2021-11-23 16:54:39,035 INFO L226 Difference]: Without dead ends: 6775 [2021-11-23 16:54:39,038 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:54:39,039 INFO L933 BasicCegarLoop]: 657 mSDtfsCounter, 996 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2595 mSolverCounterSat, 335 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 34.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 996 SdHoareTripleChecker+Valid, 664 SdHoareTripleChecker+Invalid, 2930 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 335 IncrementalHoareTripleChecker+Valid, 2595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 41.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:39,039 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [996 Valid, 664 Invalid, 2930 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [335 Valid, 2595 Invalid, 0 Unknown, 0 Unchecked, 41.5s Time] [2021-11-23 16:54:39,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6775 states. [2021-11-23 16:54:39,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6775 to 6773. [2021-11-23 16:54:39,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6773 states, 6771 states have (on average 1.3215182395510265) internal successors, (8948), 6772 states have internal predecessors, (8948), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:39,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6773 states to 6773 states and 8948 transitions. [2021-11-23 16:54:39,190 INFO L78 Accepts]: Start accepts. Automaton has 6773 states and 8948 transitions. Word has length 95 [2021-11-23 16:54:39,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:39,190 INFO L470 AbstractCegarLoop]: Abstraction has 6773 states and 8948 transitions. [2021-11-23 16:54:39,190 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:39,190 INFO L276 IsEmpty]: Start isEmpty. Operand 6773 states and 8948 transitions. [2021-11-23 16:54:39,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-23 16:54:39,192 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:39,192 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:54:39,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (49)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:39,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:39,406 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:39,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:39,406 INFO L85 PathProgramCache]: Analyzing trace with hash 212587247, now seen corresponding path program 1 times [2021-11-23 16:54:39,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:39,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1475919877] [2021-11-23 16:54:39,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:39,406 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:39,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:39,408 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:39,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-23 16:54:39,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:39,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:54:39,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:42,101 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:42,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:43,071 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:43,072 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:43,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1475919877] [2021-11-23 16:54:43,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1475919877] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:43,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1359481934] [2021-11-23 16:54:43,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:43,072 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:54:43,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:54:43,074 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:54:43,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-11-23 16:54:43,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:43,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:54:43,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:45,413 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:45,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:45,933 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:45,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1359481934] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:45,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431071803] [2021-11-23 16:54:45,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:45,934 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:45,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:54:45,935 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:54:45,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-23 16:54:46,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:46,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:54:46,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:47,910 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 54 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:54:47,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:48,909 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 54 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:54:48,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [431071803] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:48,909 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:54:48,909 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:54:48,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44720768] [2021-11-23 16:54:48,910 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:54:48,910 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:54:48,910 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:48,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:54:48,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:54:48,912 INFO L87 Difference]: Start difference. First operand 6773 states and 8948 transitions. Second operand has 34 states, 34 states have (on average 10.382352941176471) internal successors, (353), 33 states have internal predecessors, (353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:49,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:49,881 INFO L93 Difference]: Finished difference Result 7503 states and 9878 transitions. [2021-11-23 16:54:49,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 16:54:49,882 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 10.382352941176471) internal successors, (353), 33 states have internal predecessors, (353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 115 [2021-11-23 16:54:49,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:49,886 INFO L225 Difference]: With dead ends: 7503 [2021-11-23 16:54:49,886 INFO L226 Difference]: Without dead ends: 6809 [2021-11-23 16:54:49,888 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 697 GetRequests, 655 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=251, Invalid=1641, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:54:49,889 INFO L933 BasicCegarLoop]: 1519 mSDtfsCounter, 11674 mSDsluCounter, 25734 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11674 SdHoareTripleChecker+Valid, 27253 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 101 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:49,889 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11674 Valid, 27253 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 45 Invalid, 0 Unknown, 101 Unchecked, 0.1s Time] [2021-11-23 16:54:49,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6809 states. [2021-11-23 16:54:49,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6809 to 6809. [2021-11-23 16:54:49,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6809 states, 6807 states have (on average 1.320258557367416) internal successors, (8987), 6808 states have internal predecessors, (8987), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:49,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6809 states to 6809 states and 8987 transitions. [2021-11-23 16:54:49,993 INFO L78 Accepts]: Start accepts. Automaton has 6809 states and 8987 transitions. Word has length 115 [2021-11-23 16:54:49,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:49,993 INFO L470 AbstractCegarLoop]: Abstraction has 6809 states and 8987 transitions. [2021-11-23 16:54:49,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 10.382352941176471) internal successors, (353), 33 states have internal predecessors, (353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:49,994 INFO L276 IsEmpty]: Start isEmpty. Operand 6809 states and 8987 transitions. [2021-11-23 16:54:49,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-23 16:54:49,995 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:49,996 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:54:50,019 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:50,209 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (51)] Ended with exit code 0 [2021-11-23 16:54:50,429 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2021-11-23 16:54:50,609 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:50,609 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:50,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:50,609 INFO L85 PathProgramCache]: Analyzing trace with hash 2098510639, now seen corresponding path program 1 times [2021-11-23 16:54:50,610 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:50,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [371804326] [2021-11-23 16:54:50,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:50,610 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:50,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:50,612 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:50,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-23 16:54:50,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:50,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:54:50,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:53,330 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 30 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:53,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:54,346 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 30 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:54,347 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:54,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [371804326] [2021-11-23 16:54:54,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [371804326] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:54,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [32732395] [2021-11-23 16:54:54,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:54,348 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:54:54,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:54:54,349 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:54:54,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (54)] Waiting until timeout for monitored process [2021-11-23 16:54:54,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:54,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:54:54,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:56,716 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 30 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:56,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:57,328 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 30 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:57,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [32732395] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:57,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1305330596] [2021-11-23 16:54:57,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:57,329 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:57,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:54:57,329 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:54:57,330 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-23 16:54:57,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:57,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:54:57,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:59,826 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 30 proven. 67 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:54:59,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:00,641 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 30 proven. 67 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:55:00,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1305330596] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:00,642 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:00,642 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:55:00,642 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383309259] [2021-11-23 16:55:00,643 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:00,643 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:55:00,644 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:00,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:55:00,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:55:00,645 INFO L87 Difference]: Start difference. First operand 6809 states and 8987 transitions. Second operand has 34 states, 34 states have (on average 10.676470588235293) internal successors, (363), 33 states have internal predecessors, (363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:01,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:01,518 INFO L93 Difference]: Finished difference Result 7597 states and 9984 transitions. [2021-11-23 16:55:01,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 16:55:01,519 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 10.676470588235293) internal successors, (363), 33 states have internal predecessors, (363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 115 [2021-11-23 16:55:01,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:01,525 INFO L225 Difference]: With dead ends: 7597 [2021-11-23 16:55:01,525 INFO L226 Difference]: Without dead ends: 6903 [2021-11-23 16:55:01,528 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 697 GetRequests, 655 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=256, Invalid=1636, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:55:01,529 INFO L933 BasicCegarLoop]: 1523 mSDtfsCounter, 10214 mSDsluCounter, 22733 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10214 SdHoareTripleChecker+Valid, 24256 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 137 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:01,529 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10214 Valid, 24256 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 59 Invalid, 0 Unknown, 137 Unchecked, 0.1s Time] [2021-11-23 16:55:01,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6903 states. [2021-11-23 16:55:01,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6903 to 6903. [2021-11-23 16:55:01,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6903 states, 6901 states have (on average 1.3174902188088682) internal successors, (9092), 6902 states have internal predecessors, (9092), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:01,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6903 states to 6903 states and 9092 transitions. [2021-11-23 16:55:01,702 INFO L78 Accepts]: Start accepts. Automaton has 6903 states and 9092 transitions. Word has length 115 [2021-11-23 16:55:01,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:01,702 INFO L470 AbstractCegarLoop]: Abstraction has 6903 states and 9092 transitions. [2021-11-23 16:55:01,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 10.676470588235293) internal successors, (363), 33 states have internal predecessors, (363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:01,702 INFO L276 IsEmpty]: Start isEmpty. Operand 6903 states and 9092 transitions. [2021-11-23 16:55:01,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-23 16:55:01,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:01,705 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:01,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (54)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:01,917 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Ended with exit code 0 [2021-11-23 16:55:02,132 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2021-11-23 16:55:02,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:02,307 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:02,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:02,308 INFO L85 PathProgramCache]: Analyzing trace with hash 76537569, now seen corresponding path program 1 times [2021-11-23 16:55:02,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:02,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [442287787] [2021-11-23 16:55:02,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:02,308 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:02,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:02,310 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:02,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-23 16:55:02,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:02,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:55:02,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:05,563 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:05,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:06,426 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:06,426 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:06,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [442287787] [2021-11-23 16:55:06,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [442287787] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:06,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2122055088] [2021-11-23 16:55:06,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:06,427 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:06,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:06,427 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:06,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (57)] Waiting until timeout for monitored process [2021-11-23 16:55:06,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:06,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:55:06,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:09,221 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:09,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:09,683 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:09,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2122055088] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:09,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659462169] [2021-11-23 16:55:09,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:09,684 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:09,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:55:09,686 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:55:09,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-23 16:55:09,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:09,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:55:09,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:12,009 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 74 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:55:12,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:12,928 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 74 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:55:12,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [659462169] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:12,928 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:12,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:55:12,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475649181] [2021-11-23 16:55:12,928 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:12,929 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:55:12,929 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:12,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:55:12,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:55:12,930 INFO L87 Difference]: Start difference. First operand 6903 states and 9092 transitions. Second operand has 34 states, 34 states have (on average 11.117647058823529) internal successors, (378), 33 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:13,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:13,859 INFO L93 Difference]: Finished difference Result 7719 states and 10126 transitions. [2021-11-23 16:55:13,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 16:55:13,860 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 11.117647058823529) internal successors, (378), 33 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 115 [2021-11-23 16:55:13,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:13,866 INFO L225 Difference]: With dead ends: 7719 [2021-11-23 16:55:13,866 INFO L226 Difference]: Without dead ends: 7025 [2021-11-23 16:55:13,869 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 656 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=249, Invalid=1643, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:55:13,869 INFO L933 BasicCegarLoop]: 1526 mSDtfsCounter, 8794 mSDsluCounter, 30233 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8794 SdHoareTripleChecker+Valid, 31759 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 101 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:13,870 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8794 Valid, 31759 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 23 Invalid, 0 Unknown, 101 Unchecked, 0.0s Time] [2021-11-23 16:55:13,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7025 states. [2021-11-23 16:55:14,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7025 to 7025. [2021-11-23 16:55:14,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7025 states, 7023 states have (on average 1.3145379467464047) internal successors, (9232), 7024 states have internal predecessors, (9232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:14,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7025 states to 7025 states and 9232 transitions. [2021-11-23 16:55:14,024 INFO L78 Accepts]: Start accepts. Automaton has 7025 states and 9232 transitions. Word has length 115 [2021-11-23 16:55:14,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:14,024 INFO L470 AbstractCegarLoop]: Abstraction has 7025 states and 9232 transitions. [2021-11-23 16:55:14,024 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 11.117647058823529) internal successors, (378), 33 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:14,024 INFO L276 IsEmpty]: Start isEmpty. Operand 7025 states and 9232 transitions. [2021-11-23 16:55:14,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-23 16:55:14,025 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:14,026 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:14,037 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:14,227 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (57)] Ended with exit code 0 [2021-11-23 16:55:14,446 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:14,626 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:14,627 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:14,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:14,627 INFO L85 PathProgramCache]: Analyzing trace with hash -631418255, now seen corresponding path program 1 times [2021-11-23 16:55:14,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:14,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [92301395] [2021-11-23 16:55:14,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:14,627 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:14,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:14,629 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:14,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (59)] Waiting until timeout for monitored process [2021-11-23 16:55:14,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:14,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:55:14,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:16,812 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 60 proven. 32 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:55:16,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:17,697 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 60 proven. 32 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:55:17,698 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:17,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [92301395] [2021-11-23 16:55:17,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [92301395] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:17,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1937218585] [2021-11-23 16:55:17,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:17,701 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:17,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:17,704 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:17,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (60)] Waiting until timeout for monitored process [2021-11-23 16:55:17,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:17,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:55:17,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:21,333 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 31 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:21,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:22,466 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 31 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:22,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1937218585] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:22,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [757828316] [2021-11-23 16:55:22,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:22,467 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:22,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:55:22,468 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:55:22,470 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-23 16:55:22,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:22,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:55:22,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:25,050 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 31 proven. 66 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:55:25,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:25,879 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 31 proven. 66 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:55:25,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [757828316] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:25,879 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:25,880 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 16:55:25,880 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669702652] [2021-11-23 16:55:25,880 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:25,881 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 16:55:25,881 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:25,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 16:55:25,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 16:55:25,883 INFO L87 Difference]: Start difference. First operand 7025 states and 9232 transitions. Second operand has 48 states, 48 states have (on average 10.8125) internal successors, (519), 47 states have internal predecessors, (519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:28,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:28,343 INFO L93 Difference]: Finished difference Result 7832 states and 10254 transitions. [2021-11-23 16:55:28,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 16:55:28,349 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 10.8125) internal successors, (519), 47 states have internal predecessors, (519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 115 [2021-11-23 16:55:28,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:28,382 INFO L225 Difference]: With dead ends: 7832 [2021-11-23 16:55:28,382 INFO L226 Difference]: Without dead ends: 7138 [2021-11-23 16:55:28,385 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 643 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1121 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=468, Invalid=4088, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 16:55:28,385 INFO L933 BasicCegarLoop]: 1523 mSDtfsCounter, 13146 mSDsluCounter, 36850 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13146 SdHoareTripleChecker+Valid, 38373 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 170 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:28,385 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13146 Valid, 38373 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 102 Invalid, 0 Unknown, 170 Unchecked, 0.1s Time] [2021-11-23 16:55:28,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7138 states. [2021-11-23 16:55:28,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7138 to 7134. [2021-11-23 16:55:28,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7134 states, 7132 states have (on average 1.3121144139091419) internal successors, (9358), 7133 states have internal predecessors, (9358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:28,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7134 states to 7134 states and 9358 transitions. [2021-11-23 16:55:28,547 INFO L78 Accepts]: Start accepts. Automaton has 7134 states and 9358 transitions. Word has length 115 [2021-11-23 16:55:28,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:28,548 INFO L470 AbstractCegarLoop]: Abstraction has 7134 states and 9358 transitions. [2021-11-23 16:55:28,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 10.8125) internal successors, (519), 47 states have internal predecessors, (519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:28,548 INFO L276 IsEmpty]: Start isEmpty. Operand 7134 states and 9358 transitions. [2021-11-23 16:55:28,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-23 16:55:28,550 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:28,550 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:28,577 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Ended with exit code 0 [2021-11-23 16:55:28,774 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (59)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:28,967 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (60)] Ended with exit code 0 [2021-11-23 16:55:29,166 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:29,166 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:29,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:29,167 INFO L85 PathProgramCache]: Analyzing trace with hash -1632779919, now seen corresponding path program 1 times [2021-11-23 16:55:29,167 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:29,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1014828008] [2021-11-23 16:55:29,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:29,167 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:29,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:29,168 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:29,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (62)] Waiting until timeout for monitored process [2021-11-23 16:55:29,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:29,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:55:29,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:31,245 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 64 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:55:31,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:31,989 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 64 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:55:31,989 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:31,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1014828008] [2021-11-23 16:55:31,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1014828008] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:31,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [95516027] [2021-11-23 16:55:31,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:31,990 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:31,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:31,992 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:31,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (63)] Waiting until timeout for monitored process [2021-11-23 16:55:32,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:32,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:55:32,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:36,134 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:36,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:37,276 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:37,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [95516027] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:37,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552535243] [2021-11-23 16:55:37,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:37,276 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:37,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:55:37,278 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:55:37,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-23 16:55:37,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:37,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:55:37,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:39,468 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 54 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:55:39,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:40,471 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 54 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:55:40,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1552535243] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:40,471 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:40,471 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 16:55:40,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912287086] [2021-11-23 16:55:40,472 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:40,472 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 16:55:40,472 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:40,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 16:55:40,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 16:55:40,474 INFO L87 Difference]: Start difference. First operand 7134 states and 9358 transitions. Second operand has 48 states, 48 states have (on average 10.666666666666666) internal successors, (512), 47 states have internal predecessors, (512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:42,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:42,641 INFO L93 Difference]: Finished difference Result 7965 states and 10408 transitions. [2021-11-23 16:55:42,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 16:55:42,641 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 10.666666666666666) internal successors, (512), 47 states have internal predecessors, (512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 115 [2021-11-23 16:55:42,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:42,648 INFO L225 Difference]: With dead ends: 7965 [2021-11-23 16:55:42,648 INFO L226 Difference]: Without dead ends: 7271 [2021-11-23 16:55:42,651 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 710 GetRequests, 644 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=404, Invalid=3756, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 16:55:42,652 INFO L933 BasicCegarLoop]: 1523 mSDtfsCounter, 11811 mSDsluCounter, 39700 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11811 SdHoareTripleChecker+Valid, 41223 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 233 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:42,652 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11811 Valid, 41223 Invalid, 327 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [8 Valid, 86 Invalid, 0 Unknown, 233 Unchecked, 0.1s Time] [2021-11-23 16:55:42,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7271 states. [2021-11-23 16:55:42,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7271 to 7263. [2021-11-23 16:55:42,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7263 states, 7261 states have (on average 1.3094615066795208) internal successors, (9508), 7262 states have internal predecessors, (9508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:42,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7263 states to 7263 states and 9508 transitions. [2021-11-23 16:55:42,884 INFO L78 Accepts]: Start accepts. Automaton has 7263 states and 9508 transitions. Word has length 115 [2021-11-23 16:55:42,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:42,884 INFO L470 AbstractCegarLoop]: Abstraction has 7263 states and 9508 transitions. [2021-11-23 16:55:42,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 10.666666666666666) internal successors, (512), 47 states have internal predecessors, (512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:42,885 INFO L276 IsEmpty]: Start isEmpty. Operand 7263 states and 9508 transitions. [2021-11-23 16:55:42,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-23 16:55:42,887 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:42,887 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:42,902 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (62)] Ended with exit code 0 [2021-11-23 16:55:43,121 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:43,302 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (63)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:43,501 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:43,501 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:43,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:43,501 INFO L85 PathProgramCache]: Analyzing trace with hash -684806031, now seen corresponding path program 1 times [2021-11-23 16:55:43,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:43,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [203835327] [2021-11-23 16:55:43,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:43,502 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:43,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:43,503 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:43,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Waiting until timeout for monitored process [2021-11-23 16:55:43,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:43,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:55:43,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:45,328 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 68 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:55:45,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:46,222 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 68 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:55:46,224 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:46,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [203835327] [2021-11-23 16:55:46,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [203835327] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:46,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [469232457] [2021-11-23 16:55:46,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:46,225 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:46,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:46,226 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:46,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (66)] Waiting until timeout for monitored process [2021-11-23 16:55:46,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:46,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:55:46,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:48,651 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:48,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:49,501 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:49,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [469232457] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:49,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387195800] [2021-11-23 16:55:49,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:49,501 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:49,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:55:49,502 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:55:49,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-23 16:55:49,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:49,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:55:49,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:51,467 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 54 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:55:51,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:52,438 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 54 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:55:52,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [387195800] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:52,439 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:52,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 16:55:52,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279391505] [2021-11-23 16:55:52,439 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:52,440 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 16:55:52,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:52,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 16:55:52,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 16:55:52,441 INFO L87 Difference]: Start difference. First operand 7263 states and 9508 transitions. Second operand has 39 states, 39 states have (on average 11.41025641025641) internal successors, (445), 38 states have internal predecessors, (445), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:54,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:54,019 INFO L93 Difference]: Finished difference Result 7984 states and 10427 transitions. [2021-11-23 16:55:54,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 16:55:54,019 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 11.41025641025641) internal successors, (445), 38 states have internal predecessors, (445), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 115 [2021-11-23 16:55:54,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:54,026 INFO L225 Difference]: With dead ends: 7984 [2021-11-23 16:55:54,026 INFO L226 Difference]: Without dead ends: 7290 [2021-11-23 16:55:54,028 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 706 GetRequests, 651 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=368, Invalid=2602, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 16:55:54,029 INFO L933 BasicCegarLoop]: 1508 mSDtfsCounter, 13162 mSDsluCounter, 27291 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13162 SdHoareTripleChecker+Valid, 28799 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 163 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:54,029 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13162 Valid, 28799 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 98 Invalid, 0 Unknown, 163 Unchecked, 0.1s Time] [2021-11-23 16:55:54,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7290 states. [2021-11-23 16:55:54,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7290 to 7288. [2021-11-23 16:55:54,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7288 states, 7286 states have (on average 1.3078506725226462) internal successors, (9529), 7287 states have internal predecessors, (9529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:54,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7288 states to 7288 states and 9529 transitions. [2021-11-23 16:55:54,182 INFO L78 Accepts]: Start accepts. Automaton has 7288 states and 9529 transitions. Word has length 115 [2021-11-23 16:55:54,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:54,183 INFO L470 AbstractCegarLoop]: Abstraction has 7288 states and 9529 transitions. [2021-11-23 16:55:54,183 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 11.41025641025641) internal successors, (445), 38 states have internal predecessors, (445), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:54,183 INFO L276 IsEmpty]: Start isEmpty. Operand 7288 states and 9529 transitions. [2021-11-23 16:55:54,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 16:55:54,184 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:54,184 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:54,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:54,405 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2021-11-23 16:55:54,586 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (66)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:54,785 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:54,785 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:54,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:54,786 INFO L85 PathProgramCache]: Analyzing trace with hash -340441394, now seen corresponding path program 1 times [2021-11-23 16:55:54,786 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:54,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [54076113] [2021-11-23 16:55:54,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:54,786 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:54,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:54,787 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:54,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Waiting until timeout for monitored process [2021-11-23 16:55:54,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:54,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 16:55:54,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:01,653 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 25 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:01,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:04,263 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:04,263 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:04,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [54076113] [2021-11-23 16:56:04,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [54076113] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:04,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [503925532] [2021-11-23 16:56:04,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:04,264 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:04,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:56:04,264 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:56:04,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (69)] Waiting until timeout for monitored process [2021-11-23 16:56:04,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:04,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 16:56:04,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:09,238 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 63 proven. 6 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 16:56:09,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:12,838 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:12,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [503925532] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:12,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1540132052] [2021-11-23 16:56:12,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:12,839 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:56:12,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:56:12,839 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:56:12,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-23 16:56:12,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:12,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 16:56:12,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:19,410 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 25 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:19,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:22,287 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:22,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1540132052] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:22,287 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:56:22,288 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 20, 24, 22, 21] total 99 [2021-11-23 16:56:22,288 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518065647] [2021-11-23 16:56:22,288 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:56:22,289 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2021-11-23 16:56:22,289 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:22,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2021-11-23 16:56:22,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1107, Invalid=8595, Unknown=0, NotChecked=0, Total=9702 [2021-11-23 16:56:22,292 INFO L87 Difference]: Start difference. First operand 7288 states and 9529 transitions. Second operand has 99 states, 99 states have (on average 4.848484848484849) internal successors, (480), 99 states have internal predecessors, (480), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:35,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:35,952 INFO L93 Difference]: Finished difference Result 11260 states and 14423 transitions. [2021-11-23 16:56:35,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-23 16:56:35,953 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 4.848484848484849) internal successors, (480), 99 states have internal predecessors, (480), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-23 16:56:35,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:35,960 INFO L225 Difference]: With dead ends: 11260 [2021-11-23 16:56:35,960 INFO L226 Difference]: Without dead ends: 10291 [2021-11-23 16:56:35,963 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 595 SyntacticMatches, 8 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7568 ImplicationChecksByTransitivity, 23.8s TimeCoverageRelationStatistics Valid=2064, Invalid=19106, Unknown=0, NotChecked=0, Total=21170 [2021-11-23 16:56:35,964 INFO L933 BasicCegarLoop]: 1680 mSDtfsCounter, 17890 mSDsluCounter, 54141 mSDsCounter, 0 mSdLazyCounter, 1572 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17890 SdHoareTripleChecker+Valid, 55821 SdHoareTripleChecker+Invalid, 2368 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 1572 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 759 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:35,964 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17890 Valid, 55821 Invalid, 2368 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [37 Valid, 1572 Invalid, 0 Unknown, 759 Unchecked, 3.1s Time] [2021-11-23 16:56:35,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10291 states. [2021-11-23 16:56:36,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10291 to 9202. [2021-11-23 16:56:36,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9202 states, 9200 states have (on average 1.2971739130434783) internal successors, (11934), 9201 states have internal predecessors, (11934), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:36,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9202 states to 9202 states and 11934 transitions. [2021-11-23 16:56:36,285 INFO L78 Accepts]: Start accepts. Automaton has 9202 states and 11934 transitions. Word has length 116 [2021-11-23 16:56:36,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:36,286 INFO L470 AbstractCegarLoop]: Abstraction has 9202 states and 11934 transitions. [2021-11-23 16:56:36,286 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 99 states have (on average 4.848484848484849) internal successors, (480), 99 states have internal predecessors, (480), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:36,286 INFO L276 IsEmpty]: Start isEmpty. Operand 9202 states and 11934 transitions. [2021-11-23 16:56:36,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 16:56:36,288 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:36,288 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:56:36,311 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:36,496 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Ended with exit code 0 [2021-11-23 16:56:36,690 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (69)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:36,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:36,889 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:56:36,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:56:36,889 INFO L85 PathProgramCache]: Analyzing trace with hash -395343836, now seen corresponding path program 1 times [2021-11-23 16:56:36,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:56:36,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [389222812] [2021-11-23 16:56:36,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:36,890 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:56:36,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:56:36,891 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:56:36,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (71)] Waiting until timeout for monitored process [2021-11-23 16:56:36,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:36,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:56:36,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:38,436 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 28 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:56:38,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:39,242 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 28 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:56:39,242 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:39,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [389222812] [2021-11-23 16:56:39,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [389222812] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:39,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1084182125] [2021-11-23 16:56:39,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:39,243 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:39,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:56:39,244 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:56:39,266 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (72)] Waiting until timeout for monitored process [2021-11-23 16:56:39,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:39,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:56:39,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:40,780 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 28 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:56:40,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:41,404 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 28 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:56:41,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1084182125] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:41,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1142452740] [2021-11-23 16:56:41,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:41,404 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:56:41,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:56:41,405 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:56:41,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-23 16:56:41,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:41,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:56:41,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:42,785 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 28 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:56:42,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:43,461 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 39 proven. 28 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:56:43,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1142452740] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:43,461 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:56:43,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:56:43,462 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783190691] [2021-11-23 16:56:43,462 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:56:43,463 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:56:43,463 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:43,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:56:43,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:56:43,464 INFO L87 Difference]: Start difference. First operand 9202 states and 11934 transitions. Second operand has 16 states, 16 states have (on average 10.5625) internal successors, (169), 15 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:43,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:43,981 INFO L93 Difference]: Finished difference Result 12555 states and 16168 transitions. [2021-11-23 16:56:43,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 16:56:43,981 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.5625) internal successors, (169), 15 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-23 16:56:43,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:43,991 INFO L225 Difference]: With dead ends: 12555 [2021-11-23 16:56:43,991 INFO L226 Difference]: Without dead ends: 9927 [2021-11-23 16:56:43,995 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 695 GetRequests, 677 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=80, Invalid=300, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:56:43,996 INFO L933 BasicCegarLoop]: 1520 mSDtfsCounter, 4454 mSDsluCounter, 13679 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4454 SdHoareTripleChecker+Valid, 15199 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 46 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:43,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4454 Valid, 15199 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 46 Unchecked, 0.0s Time] [2021-11-23 16:56:44,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9927 states. [2021-11-23 16:56:44,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9927 to 9903. [2021-11-23 16:56:44,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9903 states, 9901 states have (on average 1.295020704979295) internal successors, (12822), 9902 states have internal predecessors, (12822), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:44,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9903 states to 9903 states and 12822 transitions. [2021-11-23 16:56:44,404 INFO L78 Accepts]: Start accepts. Automaton has 9903 states and 12822 transitions. Word has length 116 [2021-11-23 16:56:44,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:44,404 INFO L470 AbstractCegarLoop]: Abstraction has 9903 states and 12822 transitions. [2021-11-23 16:56:44,405 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.5625) internal successors, (169), 15 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:44,405 INFO L276 IsEmpty]: Start isEmpty. Operand 9903 states and 12822 transitions. [2021-11-23 16:56:44,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 16:56:44,407 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:44,408 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:56:44,431 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (71)] Ended with exit code 0 [2021-11-23 16:56:44,641 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Ended with exit code 0 [2021-11-23 16:56:44,822 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (72)] Ended with exit code 0 [2021-11-23 16:56:45,021 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:45,021 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:56:45,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:56:45,022 INFO L85 PathProgramCache]: Analyzing trace with hash -1538156554, now seen corresponding path program 1 times [2021-11-23 16:56:45,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:56:45,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1359070201] [2021-11-23 16:56:45,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:45,023 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:56:45,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:56:45,024 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:56:45,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Waiting until timeout for monitored process [2021-11-23 16:56:45,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:45,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:56:45,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:48,290 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:48,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:49,179 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:49,180 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:49,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1359070201] [2021-11-23 16:56:49,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1359070201] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:49,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1703515014] [2021-11-23 16:56:49,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:49,180 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:49,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:56:49,181 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:56:49,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (75)] Waiting until timeout for monitored process [2021-11-23 16:56:49,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:49,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:56:49,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:52,073 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:52,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:52,565 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:52,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1703515014] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:52,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [886847974] [2021-11-23 16:56:52,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:52,565 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:56:52,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:56:52,566 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:56:52,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-23 16:56:52,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:52,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:56:52,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:54,997 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 74 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:56:54,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:55,866 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 74 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:56:55,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [886847974] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:55,867 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:56:55,867 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:56:55,867 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610478296] [2021-11-23 16:56:55,867 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:56:55,868 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:56:55,868 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:55,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:56:55,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:56:55,869 INFO L87 Difference]: Start difference. First operand 9903 states and 12822 transitions. Second operand has 34 states, 34 states have (on average 11.205882352941176) internal successors, (381), 33 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:56,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:56,818 INFO L93 Difference]: Finished difference Result 12641 states and 16265 transitions. [2021-11-23 16:56:56,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 16:56:56,818 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 11.205882352941176) internal successors, (381), 33 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-23 16:56:56,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:56,830 INFO L225 Difference]: With dead ends: 12641 [2021-11-23 16:56:56,831 INFO L226 Difference]: Without dead ends: 10017 [2021-11-23 16:56:56,836 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 702 GetRequests, 662 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 419 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=216, Invalid=1506, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 16:56:56,836 INFO L933 BasicCegarLoop]: 1527 mSDtfsCounter, 4395 mSDsluCounter, 30447 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4395 SdHoareTripleChecker+Valid, 31974 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 118 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:56,837 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4395 Valid, 31974 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 12 Invalid, 0 Unknown, 118 Unchecked, 0.0s Time] [2021-11-23 16:56:56,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10017 states. [2021-11-23 16:56:57,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10017 to 10017. [2021-11-23 16:56:57,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10017 states, 10015 states have (on average 1.2932601098352472) internal successors, (12952), 10016 states have internal predecessors, (12952), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:57,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10017 states to 10017 states and 12952 transitions. [2021-11-23 16:56:57,259 INFO L78 Accepts]: Start accepts. Automaton has 10017 states and 12952 transitions. Word has length 116 [2021-11-23 16:56:57,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:57,260 INFO L470 AbstractCegarLoop]: Abstraction has 10017 states and 12952 transitions. [2021-11-23 16:56:57,260 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 11.205882352941176) internal successors, (381), 33 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:57,260 INFO L276 IsEmpty]: Start isEmpty. Operand 10017 states and 12952 transitions. [2021-11-23 16:56:57,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 16:56:57,262 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:57,262 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:56:57,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:57,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (75)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:57,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:57,863 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:56:57,864 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:56:57,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:56:57,864 INFO L85 PathProgramCache]: Analyzing trace with hash 2048854918, now seen corresponding path program 1 times [2021-11-23 16:56:57,864 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:56:57,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [238532413] [2021-11-23 16:56:57,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:57,865 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:56:57,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:56:57,866 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:56:57,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (77)] Waiting until timeout for monitored process [2021-11-23 16:56:57,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:57,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:56:57,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:58,904 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 86 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 16:56:58,904 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:56:58,904 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:58,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [238532413] [2021-11-23 16:56:58,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [238532413] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:56:58,905 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:56:58,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:56:58,905 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037699712] [2021-11-23 16:56:58,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:56:58,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:56:58,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:58,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:56:58,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:56:58,907 INFO L87 Difference]: Start difference. First operand 10017 states and 12952 transitions. Second operand has 6 states, 6 states have (on average 18.0) internal successors, (108), 5 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:59,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:59,376 INFO L93 Difference]: Finished difference Result 13355 states and 17171 transitions. [2021-11-23 16:56:59,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:56:59,376 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.0) internal successors, (108), 5 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-23 16:56:59,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:59,389 INFO L225 Difference]: With dead ends: 13355 [2021-11-23 16:56:59,390 INFO L226 Difference]: Without dead ends: 10731 [2021-11-23 16:56:59,396 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:56:59,396 INFO L933 BasicCegarLoop]: 1518 mSDtfsCounter, 2963 mSDsluCounter, 1569 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2963 SdHoareTripleChecker+Valid, 3087 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 36 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:59,397 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2963 Valid, 3087 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 6 Invalid, 0 Unknown, 36 Unchecked, 0.0s Time] [2021-11-23 16:56:59,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10731 states. [2021-11-23 16:56:59,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10731 to 10709. [2021-11-23 16:56:59,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10709 states, 10707 states have (on average 1.2892500233492108) internal successors, (13804), 10708 states have internal predecessors, (13804), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:59,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10709 states to 10709 states and 13804 transitions. [2021-11-23 16:56:59,855 INFO L78 Accepts]: Start accepts. Automaton has 10709 states and 13804 transitions. Word has length 116 [2021-11-23 16:56:59,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:59,856 INFO L470 AbstractCegarLoop]: Abstraction has 10709 states and 13804 transitions. [2021-11-23 16:56:59,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.0) internal successors, (108), 5 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:59,856 INFO L276 IsEmpty]: Start isEmpty. Operand 10709 states and 13804 transitions. [2021-11-23 16:56:59,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 16:56:59,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:59,859 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:56:59,867 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (77)] Ended with exit code 0 [2021-11-23 16:57:00,060 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:57:00,060 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:00,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:00,061 INFO L85 PathProgramCache]: Analyzing trace with hash 1047493254, now seen corresponding path program 1 times [2021-11-23 16:57:00,061 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:00,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [345861341] [2021-11-23 16:57:00,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:00,061 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:00,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:00,062 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:00,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Waiting until timeout for monitored process [2021-11-23 16:57:00,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:00,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:57:00,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:02,244 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 65 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:57:02,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:02,954 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 65 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:57:02,954 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:02,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [345861341] [2021-11-23 16:57:02,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [345861341] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:02,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1423169885] [2021-11-23 16:57:02,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:02,955 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:57:02,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:57:02,956 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:57:02,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (79)] Waiting until timeout for monitored process [2021-11-23 16:57:03,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:03,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:57:03,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:04,825 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 40 proven. 28 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:57:04,825 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:05,776 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 40 proven. 28 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:57:05,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1423169885] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:05,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218294769] [2021-11-23 16:57:05,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:05,777 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:57:05,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:57:05,778 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:57:05,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2021-11-23 16:57:05,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:05,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:57:05,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:07,153 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 40 proven. 28 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:57:07,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:07,822 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 40 proven. 28 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:57:07,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1218294769] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:07,822 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:57:07,822 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 16:57:07,822 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939090412] [2021-11-23 16:57:07,822 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:57:07,823 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 16:57:07,823 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:07,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 16:57:07,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 16:57:07,824 INFO L87 Difference]: Start difference. First operand 10709 states and 13804 transitions. Second operand has 32 states, 32 states have (on average 10.375) internal successors, (332), 31 states have internal predecessors, (332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:10,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:10,034 INFO L93 Difference]: Finished difference Result 15903 states and 20324 transitions. [2021-11-23 16:57:10,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 16:57:10,035 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 10.375) internal successors, (332), 31 states have internal predecessors, (332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-23 16:57:10,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:10,047 INFO L225 Difference]: With dead ends: 15903 [2021-11-23 16:57:10,047 INFO L226 Difference]: Without dead ends: 12587 [2021-11-23 16:57:10,052 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 717 GetRequests, 665 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=310, Invalid=2342, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 16:57:10,053 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 13180 mSDsluCounter, 23084 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13180 SdHoareTripleChecker+Valid, 24613 SdHoareTripleChecker+Invalid, 371 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 276 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:10,053 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13180 Valid, 24613 Invalid, 371 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 87 Invalid, 0 Unknown, 276 Unchecked, 0.1s Time] [2021-11-23 16:57:10,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12587 states. [2021-11-23 16:57:10,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12587 to 12567. [2021-11-23 16:57:10,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12567 states, 12565 states have (on average 1.2818941504178274) internal successors, (16107), 12566 states have internal predecessors, (16107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:10,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12567 states to 12567 states and 16107 transitions. [2021-11-23 16:57:10,650 INFO L78 Accepts]: Start accepts. Automaton has 12567 states and 16107 transitions. Word has length 116 [2021-11-23 16:57:10,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:10,650 INFO L470 AbstractCegarLoop]: Abstraction has 12567 states and 16107 transitions. [2021-11-23 16:57:10,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 10.375) internal successors, (332), 31 states have internal predecessors, (332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:10,650 INFO L276 IsEmpty]: Start isEmpty. Operand 12567 states and 16107 transitions. [2021-11-23 16:57:10,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 16:57:10,653 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:10,654 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:57:10,688 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Ended with exit code 0 [2021-11-23 16:57:10,871 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (79)] Ended with exit code 0 [2021-11-23 16:57:11,078 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Ended with exit code 0 [2021-11-23 16:57:11,270 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:57:11,270 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:11,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:11,271 INFO L85 PathProgramCache]: Analyzing trace with hash 1995467142, now seen corresponding path program 1 times [2021-11-23 16:57:11,271 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:11,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1359512798] [2021-11-23 16:57:11,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:11,271 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:11,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:11,272 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:11,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (81)] Waiting until timeout for monitored process [2021-11-23 16:57:11,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:11,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:57:11,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:13,108 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 69 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:57:13,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:14,018 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 69 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:57:14,018 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:14,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1359512798] [2021-11-23 16:57:14,018 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1359512798] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:14,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1332672066] [2021-11-23 16:57:14,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:14,018 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:57:14,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:57:14,019 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:57:14,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (82)] Waiting until timeout for monitored process [2021-11-23 16:57:14,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:14,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:57:14,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:15,387 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 40 proven. 28 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:57:15,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:16,055 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 40 proven. 28 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:57:16,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1332672066] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:16,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6445405] [2021-11-23 16:57:16,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:16,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:57:16,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:57:16,057 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:57:16,077 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2021-11-23 16:57:16,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:16,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:57:16,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:17,572 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 40 proven. 28 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:57:17,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:18,270 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 40 proven. 28 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:57:18,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6445405] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:18,270 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:57:18,271 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 19 [2021-11-23 16:57:18,271 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904705467] [2021-11-23 16:57:18,271 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:57:18,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 16:57:18,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:18,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 16:57:18,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:57:18,272 INFO L87 Difference]: Start difference. First operand 12567 states and 16107 transitions. Second operand has 20 states, 20 states have (on average 11.95) internal successors, (239), 19 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:19,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:19,384 INFO L93 Difference]: Finished difference Result 16209 states and 20649 transitions. [2021-11-23 16:57:19,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 16:57:19,384 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 11.95) internal successors, (239), 19 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-23 16:57:19,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:19,398 INFO L225 Difference]: With dead ends: 16209 [2021-11-23 16:57:19,398 INFO L226 Difference]: Without dead ends: 13585 [2021-11-23 16:57:19,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 702 GetRequests, 675 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=142, Invalid=670, Unknown=0, NotChecked=0, Total=812 [2021-11-23 16:57:19,403 INFO L933 BasicCegarLoop]: 1533 mSDtfsCounter, 2991 mSDsluCounter, 19866 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2991 SdHoareTripleChecker+Valid, 21399 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 105 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:19,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2991 Valid, 21399 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 105 Unchecked, 0.0s Time] [2021-11-23 16:57:19,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13585 states. [2021-11-23 16:57:20,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13585 to 13539. [2021-11-23 16:57:20,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13539 states, 13537 states have (on average 1.2750978798847603) internal successors, (17261), 13538 states have internal predecessors, (17261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:20,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13539 states to 13539 states and 17261 transitions. [2021-11-23 16:57:20,116 INFO L78 Accepts]: Start accepts. Automaton has 13539 states and 17261 transitions. Word has length 116 [2021-11-23 16:57:20,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:20,116 INFO L470 AbstractCegarLoop]: Abstraction has 13539 states and 17261 transitions. [2021-11-23 16:57:20,116 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 11.95) internal successors, (239), 19 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:20,116 INFO L276 IsEmpty]: Start isEmpty. Operand 13539 states and 17261 transitions. [2021-11-23 16:57:20,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 16:57:20,120 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:20,120 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:57:20,140 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Ended with exit code 0 [2021-11-23 16:57:20,328 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (81)] Ended with exit code 0 [2021-11-23 16:57:20,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (82)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:20,721 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:57:20,721 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:20,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:20,721 INFO L85 PathProgramCache]: Analyzing trace with hash 1124839293, now seen corresponding path program 1 times [2021-11-23 16:57:20,722 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:20,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2019798219] [2021-11-23 16:57:20,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:20,722 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:20,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:20,723 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:20,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (84)] Waiting until timeout for monitored process [2021-11-23 16:57:20,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:20,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:57:20,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:22,598 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 53 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 16:57:22,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:23,336 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 53 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 16:57:23,336 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:23,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2019798219] [2021-11-23 16:57:23,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2019798219] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:23,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [635363179] [2021-11-23 16:57:23,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:23,337 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:57:23,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:57:23,338 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:57:23,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (85)] Waiting until timeout for monitored process [2021-11-23 16:57:23,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:23,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:57:23,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:25,422 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 53 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 16:57:25,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:26,038 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 53 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 16:57:26,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [635363179] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:26,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1044216664] [2021-11-23 16:57:26,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:26,039 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:57:26,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:57:26,040 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:57:26,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2021-11-23 16:57:26,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:26,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:57:26,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:27,907 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 53 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 16:57:27,908 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:28,481 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 53 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 16:57:28,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1044216664] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:28,482 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:57:28,482 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:57:28,482 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912953330] [2021-11-23 16:57:28,482 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:57:28,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:57:28,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:28,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:57:28,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:57:28,484 INFO L87 Difference]: Start difference. First operand 13539 states and 17261 transitions. Second operand has 16 states, 16 states have (on average 11.8125) internal successors, (189), 15 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:29,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:29,606 INFO L93 Difference]: Finished difference Result 19713 states and 24987 transitions. [2021-11-23 16:57:29,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 16:57:29,618 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.8125) internal successors, (189), 15 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-23 16:57:29,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:29,636 INFO L225 Difference]: With dead ends: 19713 [2021-11-23 16:57:29,637 INFO L226 Difference]: Without dead ends: 16359 [2021-11-23 16:57:29,643 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 699 GetRequests, 678 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=106, Invalid=400, Unknown=0, NotChecked=0, Total=506 [2021-11-23 16:57:29,643 INFO L933 BasicCegarLoop]: 1526 mSDtfsCounter, 2992 mSDsluCounter, 13568 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2992 SdHoareTripleChecker+Valid, 15094 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 57 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:29,643 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2992 Valid, 15094 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 38 Invalid, 0 Unknown, 57 Unchecked, 0.1s Time] [2021-11-23 16:57:29,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16359 states. [2021-11-23 16:57:30,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16359 to 16315. [2021-11-23 16:57:30,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16315 states, 16313 states have (on average 1.2662293876049777) internal successors, (20656), 16314 states have internal predecessors, (20656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:30,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16315 states to 16315 states and 20656 transitions. [2021-11-23 16:57:30,653 INFO L78 Accepts]: Start accepts. Automaton has 16315 states and 20656 transitions. Word has length 116 [2021-11-23 16:57:30,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:30,654 INFO L470 AbstractCegarLoop]: Abstraction has 16315 states and 20656 transitions. [2021-11-23 16:57:30,654 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.8125) internal successors, (189), 15 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:30,654 INFO L276 IsEmpty]: Start isEmpty. Operand 16315 states and 20656 transitions. [2021-11-23 16:57:30,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 16:57:30,656 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:30,656 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:57:30,660 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (85)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:30,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:31,066 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (84)] Ended with exit code 0 [2021-11-23 16:57:31,258 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:57:31,258 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:31,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:31,259 INFO L85 PathProgramCache]: Analyzing trace with hash -584478195, now seen corresponding path program 1 times [2021-11-23 16:57:31,259 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:31,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2032860460] [2021-11-23 16:57:31,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:31,259 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:31,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:31,260 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:31,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (87)] Waiting until timeout for monitored process [2021-11-23 16:57:31,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:31,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:57:31,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:32,291 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 83 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 16:57:32,291 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:57:32,291 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:32,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2032860460] [2021-11-23 16:57:32,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2032860460] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:57:32,291 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:57:32,291 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:57:32,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288983867] [2021-11-23 16:57:32,292 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:57:32,292 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:57:32,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:32,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:57:32,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:57:32,293 INFO L87 Difference]: Start difference. First operand 16315 states and 20656 transitions. Second operand has 6 states, 6 states have (on average 17.833333333333332) internal successors, (107), 5 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:33,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:33,140 INFO L93 Difference]: Finished difference Result 18941 states and 23966 transitions. [2021-11-23 16:57:33,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:57:33,141 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.833333333333332) internal successors, (107), 5 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-23 16:57:33,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:33,155 INFO L225 Difference]: With dead ends: 18941 [2021-11-23 16:57:33,155 INFO L226 Difference]: Without dead ends: 16317 [2021-11-23 16:57:33,159 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:57:33,160 INFO L933 BasicCegarLoop]: 1525 mSDtfsCounter, 1497 mSDsluCounter, 3048 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1497 SdHoareTripleChecker+Valid, 4573 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:33,161 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1497 Valid, 4573 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 13 Invalid, 0 Unknown, 37 Unchecked, 0.0s Time] [2021-11-23 16:57:33,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16317 states. [2021-11-23 16:57:34,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16317 to 16315. [2021-11-23 16:57:34,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16315 states, 16313 states have (on average 1.2619383313921413) internal successors, (20586), 16314 states have internal predecessors, (20586), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:34,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16315 states to 16315 states and 20586 transitions. [2021-11-23 16:57:34,113 INFO L78 Accepts]: Start accepts. Automaton has 16315 states and 20586 transitions. Word has length 116 [2021-11-23 16:57:34,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:34,114 INFO L470 AbstractCegarLoop]: Abstraction has 16315 states and 20586 transitions. [2021-11-23 16:57:34,114 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.833333333333332) internal successors, (107), 5 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:34,114 INFO L276 IsEmpty]: Start isEmpty. Operand 16315 states and 20586 transitions. [2021-11-23 16:57:34,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 16:57:34,117 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:34,117 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:57:34,125 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (87)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:34,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:57:34,317 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:34,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:34,318 INFO L85 PathProgramCache]: Analyzing trace with hash 1726681252, now seen corresponding path program 1 times [2021-11-23 16:57:34,318 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:34,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [212786605] [2021-11-23 16:57:34,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:34,318 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:34,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:34,319 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:34,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (88)] Waiting until timeout for monitored process [2021-11-23 16:57:34,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:34,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:57:34,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:36,180 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 30 proven. 50 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 16:57:36,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:36,825 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 30 proven. 50 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 16:57:36,826 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:36,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [212786605] [2021-11-23 16:57:36,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [212786605] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:36,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [812835938] [2021-11-23 16:57:36,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:36,826 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:57:36,826 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:57:36,833 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:57:36,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (89)] Waiting until timeout for monitored process [2021-11-23 16:57:36,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:36,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:57:36,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:38,776 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 30 proven. 50 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 16:57:38,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:39,286 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 30 proven. 50 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 16:57:39,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [812835938] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:39,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1153359604] [2021-11-23 16:57:39,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:39,287 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:57:39,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:57:39,288 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:57:39,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2021-11-23 16:57:39,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:39,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:57:39,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:41,115 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 30 proven. 50 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 16:57:41,115 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:41,584 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 30 proven. 50 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 16:57:41,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1153359604] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:41,585 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:57:41,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:57:41,585 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363043656] [2021-11-23 16:57:41,585 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:57:41,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:57:41,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:41,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:57:41,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:57:41,586 INFO L87 Difference]: Start difference. First operand 16315 states and 20586 transitions. Second operand has 16 states, 16 states have (on average 11.9375) internal successors, (191), 15 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:43,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:43,334 INFO L93 Difference]: Finished difference Result 28798 states and 36105 transitions. [2021-11-23 16:57:43,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 16:57:43,334 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.9375) internal successors, (191), 15 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-23 16:57:43,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:43,359 INFO L225 Difference]: With dead ends: 28798 [2021-11-23 16:57:43,359 INFO L226 Difference]: Without dead ends: 24180 [2021-11-23 16:57:43,367 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 699 GetRequests, 679 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=98, Invalid=364, Unknown=0, NotChecked=0, Total=462 [2021-11-23 16:57:43,367 INFO L933 BasicCegarLoop]: 1532 mSDtfsCounter, 3000 mSDsluCounter, 15278 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3000 SdHoareTripleChecker+Valid, 16810 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 142 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:43,368 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3000 Valid, 16810 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 142 Unchecked, 0.0s Time] [2021-11-23 16:57:43,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24180 states. [2021-11-23 16:57:45,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24180 to 24092. [2021-11-23 16:57:45,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24092 states, 24090 states have (on average 1.2472810294728103) internal successors, (30047), 24091 states have internal predecessors, (30047), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:45,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24092 states to 24092 states and 30047 transitions. [2021-11-23 16:57:45,102 INFO L78 Accepts]: Start accepts. Automaton has 24092 states and 30047 transitions. Word has length 116 [2021-11-23 16:57:45,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:45,102 INFO L470 AbstractCegarLoop]: Abstraction has 24092 states and 30047 transitions. [2021-11-23 16:57:45,102 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.9375) internal successors, (191), 15 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:45,103 INFO L276 IsEmpty]: Start isEmpty. Operand 24092 states and 30047 transitions. [2021-11-23 16:57:45,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 16:57:45,105 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:45,105 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:57:45,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:45,314 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (88)] Ended with exit code 0 [2021-11-23 16:57:45,507 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (89)] Ended with exit code 0 [2021-11-23 16:57:45,706 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:57:45,706 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:45,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:45,706 INFO L85 PathProgramCache]: Analyzing trace with hash -1003247642, now seen corresponding path program 1 times [2021-11-23 16:57:45,707 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:45,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1240356725] [2021-11-23 16:57:45,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:45,707 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:45,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:45,708 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:45,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (91)] Waiting until timeout for monitored process [2021-11-23 16:57:45,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:45,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:57:45,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:47,890 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 60 proven. 32 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:57:47,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:48,724 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 60 proven. 32 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:57:48,724 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:48,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1240356725] [2021-11-23 16:57:48,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1240356725] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:48,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [35071569] [2021-11-23 16:57:48,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:48,724 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:57:48,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:57:48,725 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:57:48,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (92)] Waiting until timeout for monitored process [2021-11-23 16:57:48,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:48,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:57:48,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:50,961 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 31 proven. 48 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 16:57:50,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:51,717 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 31 proven. 48 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 16:57:51,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [35071569] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:51,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [902819744] [2021-11-23 16:57:51,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:51,718 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:57:51,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:57:51,719 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:57:51,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2021-11-23 16:57:51,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:51,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:57:51,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:53,480 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 31 proven. 48 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 16:57:53,480 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:54,019 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 31 proven. 48 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 16:57:54,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [902819744] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:54,019 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:57:54,020 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 16:57:54,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255290189] [2021-11-23 16:57:54,020 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:57:54,021 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 16:57:54,021 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:54,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 16:57:54,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 16:57:54,022 INFO L87 Difference]: Start difference. First operand 24092 states and 30047 transitions. Second operand has 32 states, 32 states have (on average 11.21875) internal successors, (359), 31 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:57,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:57,466 INFO L93 Difference]: Finished difference Result 30209 states and 37663 transitions. [2021-11-23 16:57:57,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 16:57:57,466 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 11.21875) internal successors, (359), 31 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-23 16:57:57,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:57,497 INFO L225 Difference]: With dead ends: 30209 [2021-11-23 16:57:57,497 INFO L226 Difference]: Without dead ends: 27478 [2021-11-23 16:57:57,509 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 669 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 604 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=326, Invalid=2430, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 16:57:57,510 INFO L933 BasicCegarLoop]: 1560 mSDtfsCounter, 10280 mSDsluCounter, 28137 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10280 SdHoareTripleChecker+Valid, 29697 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 220 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:57,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10280 Valid, 29697 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 69 Invalid, 0 Unknown, 220 Unchecked, 0.1s Time] [2021-11-23 16:57:57,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27478 states. [2021-11-23 16:57:59,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27478 to 27394. [2021-11-23 16:57:59,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27394 states, 27392 states have (on average 1.2462032710280373) internal successors, (34136), 27393 states have internal predecessors, (34136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:59,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27394 states to 27394 states and 34136 transitions. [2021-11-23 16:57:59,554 INFO L78 Accepts]: Start accepts. Automaton has 27394 states and 34136 transitions. Word has length 116 [2021-11-23 16:57:59,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:59,555 INFO L470 AbstractCegarLoop]: Abstraction has 27394 states and 34136 transitions. [2021-11-23 16:57:59,555 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 11.21875) internal successors, (359), 31 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:59,555 INFO L276 IsEmpty]: Start isEmpty. Operand 27394 states and 34136 transitions. [2021-11-23 16:57:59,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 16:57:59,557 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:59,557 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:57:59,559 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (92)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:59,778 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Ended with exit code 0 [2021-11-23 16:57:59,966 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (91)] Ended with exit code 0 [2021-11-23 16:58:00,158 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:58:00,158 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:00,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:00,159 INFO L85 PathProgramCache]: Analyzing trace with hash -1056635418, now seen corresponding path program 1 times [2021-11-23 16:58:00,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:00,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [593923393] [2021-11-23 16:58:00,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:00,159 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:00,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:00,160 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:00,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (94)] Waiting until timeout for monitored process [2021-11-23 16:58:00,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:00,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:58:00,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:01,136 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:58:01,136 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:58:01,136 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:01,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [593923393] [2021-11-23 16:58:01,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [593923393] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:58:01,137 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:58:01,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:58:01,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112405861] [2021-11-23 16:58:01,137 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:58:01,137 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:58:01,137 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:01,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:58:01,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:58:01,138 INFO L87 Difference]: Start difference. First operand 27394 states and 34136 transitions. Second operand has 6 states, 6 states have (on average 17.666666666666668) internal successors, (106), 5 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:03,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:03,278 INFO L93 Difference]: Finished difference Result 31830 states and 39716 transitions. [2021-11-23 16:58:03,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:58:03,278 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.666666666666668) internal successors, (106), 5 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-23 16:58:03,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:03,308 INFO L225 Difference]: With dead ends: 31830 [2021-11-23 16:58:03,308 INFO L226 Difference]: Without dead ends: 29206 [2021-11-23 16:58:03,314 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:58:03,314 INFO L933 BasicCegarLoop]: 1530 mSDtfsCounter, 1503 mSDsluCounter, 1615 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1503 SdHoareTripleChecker+Valid, 3145 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 48 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:03,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1503 Valid, 3145 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 48 Unchecked, 0.0s Time] [2021-11-23 16:58:03,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29206 states. [2021-11-23 16:58:05,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29206 to 29204. [2021-11-23 16:58:05,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29204 states, 29202 states have (on average 1.241593041572495) internal successors, (36257), 29203 states have internal predecessors, (36257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:05,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29204 states to 29204 states and 36257 transitions. [2021-11-23 16:58:05,405 INFO L78 Accepts]: Start accepts. Automaton has 29204 states and 36257 transitions. Word has length 116 [2021-11-23 16:58:05,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:05,405 INFO L470 AbstractCegarLoop]: Abstraction has 29204 states and 36257 transitions. [2021-11-23 16:58:05,405 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.666666666666668) internal successors, (106), 5 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:05,405 INFO L276 IsEmpty]: Start isEmpty. Operand 29204 states and 36257 transitions. [2021-11-23 16:58:05,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 16:58:05,408 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:05,408 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:58:05,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (94)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:05,608 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:58:05,608 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:05,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:05,609 INFO L85 PathProgramCache]: Analyzing trace with hash 1143648345, now seen corresponding path program 1 times [2021-11-23 16:58:05,609 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:05,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [443760145] [2021-11-23 16:58:05,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:05,609 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:05,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:05,610 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:05,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Waiting until timeout for monitored process [2021-11-23 16:58:05,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:05,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 16:58:05,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:12,840 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 26 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:12,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:15,899 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 16 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:15,899 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:15,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [443760145] [2021-11-23 16:58:15,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [443760145] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:15,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1084278122] [2021-11-23 16:58:15,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:15,899 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:58:15,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:58:15,900 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:58:15,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Waiting until timeout for monitored process [2021-11-23 16:58:16,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:16,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 16:58:16,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:25,274 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 26 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:25,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:29,294 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 16 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:29,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1084278122] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:29,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1759050655] [2021-11-23 16:58:29,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:29,294 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:58:29,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:58:29,295 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:58:29,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-23 16:58:29,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:29,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:58:29,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:39,065 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 16 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:39,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:42,061 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 16 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:42,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1759050655] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:42,062 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:58:42,062 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 30, 24, 22, 17] total 105 [2021-11-23 16:58:42,063 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218779983] [2021-11-23 16:58:42,063 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:58:42,064 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2021-11-23 16:58:42,064 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:42,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2021-11-23 16:58:42,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=980, Invalid=9940, Unknown=0, NotChecked=0, Total=10920 [2021-11-23 16:58:42,066 INFO L87 Difference]: Start difference. First operand 29204 states and 36257 transitions. Second operand has 105 states, 105 states have (on average 4.961904761904762) internal successors, (521), 105 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:54,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:54,649 INFO L93 Difference]: Finished difference Result 36482 states and 45144 transitions. [2021-11-23 16:58:54,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-23 16:58:54,650 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 4.961904761904762) internal successors, (521), 105 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2021-11-23 16:58:54,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:54,688 INFO L225 Difference]: With dead ends: 36482 [2021-11-23 16:58:54,688 INFO L226 Difference]: Without dead ends: 31741 [2021-11-23 16:58:54,699 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 733 GetRequests, 593 SyntacticMatches, 2 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7529 ImplicationChecksByTransitivity, 22.3s TimeCoverageRelationStatistics Valid=1555, Invalid=17905, Unknown=0, NotChecked=0, Total=19460 [2021-11-23 16:58:54,699 INFO L933 BasicCegarLoop]: 1651 mSDtfsCounter, 23804 mSDsluCounter, 44722 mSDsCounter, 0 mSdLazyCounter, 1864 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23804 SdHoareTripleChecker+Valid, 46373 SdHoareTripleChecker+Invalid, 2479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 1864 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 551 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:54,700 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23804 Valid, 46373 Invalid, 2479 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [64 Valid, 1864 Invalid, 0 Unknown, 551 Unchecked, 3.3s Time] [2021-11-23 16:58:54,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31741 states. [2021-11-23 16:58:56,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31741 to 29236. [2021-11-23 16:58:56,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29236 states, 29234 states have (on average 1.241568037216939) internal successors, (36296), 29235 states have internal predecessors, (36296), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:56,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29236 states to 29236 states and 36296 transitions. [2021-11-23 16:58:56,868 INFO L78 Accepts]: Start accepts. Automaton has 29236 states and 36296 transitions. Word has length 117 [2021-11-23 16:58:56,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:56,868 INFO L470 AbstractCegarLoop]: Abstraction has 29236 states and 36296 transitions. [2021-11-23 16:58:56,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 4.961904761904762) internal successors, (521), 105 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:56,868 INFO L276 IsEmpty]: Start isEmpty. Operand 29236 states and 36296 transitions. [2021-11-23 16:58:56,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 16:58:56,871 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:56,871 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:58:56,892 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Ended with exit code 0 [2021-11-23 16:58:57,079 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Ended with exit code 0 [2021-11-23 16:58:57,273 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Ended with exit code 0 [2021-11-23 16:58:57,472 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:58:57,472 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:57,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:57,472 INFO L85 PathProgramCache]: Analyzing trace with hash -1967832886, now seen corresponding path program 1 times [2021-11-23 16:58:57,472 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:57,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1863550858] [2021-11-23 16:58:57,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:57,473 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:57,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:57,474 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:57,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Waiting until timeout for monitored process [2021-11-23 16:58:57,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:57,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:58:57,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:00,689 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:00,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:01,592 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:01,592 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:01,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1863550858] [2021-11-23 16:59:01,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1863550858] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:01,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [955712147] [2021-11-23 16:59:01,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:01,593 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:01,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:59:01,593 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:59:01,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Waiting until timeout for monitored process [2021-11-23 16:59:01,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:01,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:59:01,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:04,534 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:04,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:05,031 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:05,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [955712147] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:05,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [602645476] [2021-11-23 16:59:05,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:05,031 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:05,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:59:05,032 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:59:05,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-23 16:59:05,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:05,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:59:05,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:07,541 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 74 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:59:07,542 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:08,472 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 74 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:59:08,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [602645476] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:08,473 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:59:08,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:59:08,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490745572] [2021-11-23 16:59:08,473 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:59:08,474 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:59:08,475 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:08,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:59:08,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:59:08,476 INFO L87 Difference]: Start difference. First operand 29236 states and 36296 transitions. Second operand has 34 states, 34 states have (on average 11.176470588235293) internal successors, (380), 33 states have internal predecessors, (380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:11,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:11,214 INFO L93 Difference]: Finished difference Result 40936 states and 50859 transitions. [2021-11-23 16:59:11,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 16:59:11,215 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 11.176470588235293) internal successors, (380), 33 states have internal predecessors, (380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2021-11-23 16:59:11,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:11,249 INFO L225 Difference]: With dead ends: 40936 [2021-11-23 16:59:11,249 INFO L226 Difference]: Without dead ends: 29256 [2021-11-23 16:59:11,263 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 709 GetRequests, 667 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=253, Invalid=1639, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:59:11,264 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 11692 mSDsluCounter, 24227 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11692 SdHoareTripleChecker+Valid, 25756 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 123 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:11,264 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11692 Valid, 25756 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 83 Invalid, 0 Unknown, 123 Unchecked, 0.1s Time] [2021-11-23 16:59:11,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29256 states. [2021-11-23 16:59:13,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29256 to 29256. [2021-11-23 16:59:13,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29256 states, 29254 states have (on average 1.2413003349969236) internal successors, (36313), 29255 states have internal predecessors, (36313), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:13,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29256 states to 29256 states and 36313 transitions. [2021-11-23 16:59:13,414 INFO L78 Accepts]: Start accepts. Automaton has 29256 states and 36313 transitions. Word has length 117 [2021-11-23 16:59:13,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:13,414 INFO L470 AbstractCegarLoop]: Abstraction has 29256 states and 36313 transitions. [2021-11-23 16:59:13,415 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 11.176470588235293) internal successors, (380), 33 states have internal predecessors, (380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:13,415 INFO L276 IsEmpty]: Start isEmpty. Operand 29256 states and 36313 transitions. [2021-11-23 16:59:13,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 16:59:13,417 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:13,417 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:13,422 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:13,626 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Ended with exit code 0 [2021-11-23 16:59:13,839 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:14,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:14,018 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:14,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:14,022 INFO L85 PathProgramCache]: Analyzing trace with hash 2073944156, now seen corresponding path program 1 times [2021-11-23 16:59:14,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:14,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [924893524] [2021-11-23 16:59:14,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:14,022 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:14,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:14,023 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:14,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Waiting until timeout for monitored process [2021-11-23 16:59:14,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:14,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:59:14,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:15,413 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 52 proven. 40 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:59:15,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:16,052 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 65 proven. 27 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:59:16,052 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:16,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [924893524] [2021-11-23 16:59:16,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [924893524] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:16,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1121451079] [2021-11-23 16:59:16,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:16,053 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:16,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:59:16,055 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:59:16,056 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Waiting until timeout for monitored process [2021-11-23 16:59:16,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:16,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:59:16,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:17,219 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 52 proven. 40 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:59:17,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:17,611 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 65 proven. 27 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:59:17,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1121451079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:17,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2030224215] [2021-11-23 16:59:17,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:17,612 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:17,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:59:17,613 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:59:17,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-23 16:59:17,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:17,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:59:17,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:18,656 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 54 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:59:18,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:19,071 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 65 proven. 27 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:59:19,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2030224215] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:19,072 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:59:19,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 14, 11, 12, 11] total 27 [2021-11-23 16:59:19,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469272543] [2021-11-23 16:59:19,072 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:59:19,073 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 16:59:19,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:19,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 16:59:19,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=606, Unknown=0, NotChecked=0, Total=702 [2021-11-23 16:59:19,074 INFO L87 Difference]: Start difference. First operand 29256 states and 36313 transitions. Second operand has 27 states, 27 states have (on average 9.185185185185185) internal successors, (248), 27 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:23,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:23,010 INFO L93 Difference]: Finished difference Result 53384 states and 66381 transitions. [2021-11-23 16:59:23,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 16:59:23,010 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 9.185185185185185) internal successors, (248), 27 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2021-11-23 16:59:23,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:23,062 INFO L225 Difference]: With dead ends: 53384 [2021-11-23 16:59:23,062 INFO L226 Difference]: Without dead ends: 45364 [2021-11-23 16:59:23,077 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 709 GetRequests, 674 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=185, Invalid=1147, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 16:59:23,078 INFO L933 BasicCegarLoop]: 1589 mSDtfsCounter, 6301 mSDsluCounter, 20956 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6301 SdHoareTripleChecker+Valid, 22545 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 72 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:23,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6301 Valid, 22545 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 142 Invalid, 0 Unknown, 72 Unchecked, 0.2s Time] [2021-11-23 16:59:23,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45364 states. [2021-11-23 16:59:26,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45364 to 40114. [2021-11-23 16:59:26,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40114 states, 40112 states have (on average 1.238457319505385) internal successors, (49677), 40113 states have internal predecessors, (49677), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:26,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40114 states to 40114 states and 49677 transitions. [2021-11-23 16:59:26,580 INFO L78 Accepts]: Start accepts. Automaton has 40114 states and 49677 transitions. Word has length 117 [2021-11-23 16:59:26,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:26,580 INFO L470 AbstractCegarLoop]: Abstraction has 40114 states and 49677 transitions. [2021-11-23 16:59:26,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 9.185185185185185) internal successors, (248), 27 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:26,580 INFO L276 IsEmpty]: Start isEmpty. Operand 40114 states and 49677 transitions. [2021-11-23 16:59:26,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 16:59:26,582 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:26,583 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:26,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:26,791 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Ended with exit code 0 [2021-11-23 16:59:27,004 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Ended with exit code 0 [2021-11-23 16:59:27,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:27,186 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:27,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:27,186 INFO L85 PathProgramCache]: Analyzing trace with hash 2092140978, now seen corresponding path program 1 times [2021-11-23 16:59:27,186 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:27,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [868274106] [2021-11-23 16:59:27,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:27,187 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:27,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:27,194 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:27,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Waiting until timeout for monitored process [2021-11-23 16:59:27,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:27,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:59:27,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:28,897 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 27 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:28,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:29,699 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 44 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:29,699 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:29,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [868274106] [2021-11-23 16:59:29,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [868274106] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:29,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2032207089] [2021-11-23 16:59:29,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:29,699 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:29,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:59:29,700 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:59:29,701 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (105)] Waiting until timeout for monitored process [2021-11-23 16:59:29,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:29,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:59:29,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:31,077 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 27 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:31,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:31,521 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 44 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:31,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2032207089] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:31,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58657500] [2021-11-23 16:59:31,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:31,521 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:31,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:59:31,522 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:59:31,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2021-11-23 16:59:31,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:31,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 16:59:31,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:35,944 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 16 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:35,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:37,218 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 44 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:37,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58657500] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:37,218 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:59:37,218 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 14, 11, 19, 15] total 46 [2021-11-23 16:59:37,218 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029330329] [2021-11-23 16:59:37,218 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:59:37,219 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-23 16:59:37,219 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:37,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-23 16:59:37,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=1861, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 16:59:37,220 INFO L87 Difference]: Start difference. First operand 40114 states and 49677 transitions. Second operand has 46 states, 46 states have (on average 7.565217391304348) internal successors, (348), 46 states have internal predecessors, (348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:44,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:44,709 INFO L93 Difference]: Finished difference Result 75775 states and 94076 transitions. [2021-11-23 16:59:44,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-23 16:59:44,710 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 7.565217391304348) internal successors, (348), 46 states have internal predecessors, (348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2021-11-23 16:59:44,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:44,793 INFO L225 Difference]: With dead ends: 75775 [2021-11-23 16:59:44,793 INFO L226 Difference]: Without dead ends: 63871 [2021-11-23 16:59:44,808 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 742 GetRequests, 671 SyntacticMatches, 3 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1441 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=475, Invalid=4355, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 16:59:44,809 INFO L933 BasicCegarLoop]: 1584 mSDtfsCounter, 3546 mSDsluCounter, 24373 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3546 SdHoareTripleChecker+Valid, 25957 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 244 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:44,809 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3546 Valid, 25957 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 227 Invalid, 0 Unknown, 244 Unchecked, 0.4s Time] [2021-11-23 16:59:44,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63871 states. [2021-11-23 16:59:50,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63871 to 54875. [2021-11-23 16:59:50,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54875 states, 54873 states have (on average 1.2444007070872742) internal successors, (68284), 54874 states have internal predecessors, (68284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:50,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54875 states to 54875 states and 68284 transitions. [2021-11-23 16:59:50,112 INFO L78 Accepts]: Start accepts. Automaton has 54875 states and 68284 transitions. Word has length 117 [2021-11-23 16:59:50,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:50,112 INFO L470 AbstractCegarLoop]: Abstraction has 54875 states and 68284 transitions. [2021-11-23 16:59:50,112 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 7.565217391304348) internal successors, (348), 46 states have internal predecessors, (348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:50,113 INFO L276 IsEmpty]: Start isEmpty. Operand 54875 states and 68284 transitions. [2021-11-23 16:59:50,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 16:59:50,115 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:50,115 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:50,119 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (105)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:50,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:50,536 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Ended with exit code 0 [2021-11-23 16:59:50,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:50,716 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:50,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:50,716 INFO L85 PathProgramCache]: Analyzing trace with hash 229828600, now seen corresponding path program 1 times [2021-11-23 16:59:50,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:50,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [9887051] [2021-11-23 16:59:50,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:50,717 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:50,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:50,717 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:50,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (107)] Waiting until timeout for monitored process [2021-11-23 16:59:50,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:50,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 16:59:50,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:58,828 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 35 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:58,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:03,249 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 25 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:03,249 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:03,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [9887051] [2021-11-23 17:00:03,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [9887051] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:03,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [360850705] [2021-11-23 17:00:03,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:03,250 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:03,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:00:03,251 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:00:03,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (108)] Waiting until timeout for monitored process [2021-11-23 17:00:03,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:03,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:00:03,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:12,702 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 35 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:12,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:20,990 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 21 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:20,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [360850705] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:20,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435143107] [2021-11-23 17:00:20,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:20,991 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:20,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:20,992 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:00:20,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2021-11-23 17:00:21,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:21,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:00:21,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:27,158 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 35 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:27,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:33,424 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 21 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:33,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435143107] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:33,425 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:00:33,425 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 30, 28, 24, 24] total 133 [2021-11-23 17:00:33,425 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997969612] [2021-11-23 17:00:33,425 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:00:33,426 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2021-11-23 17:00:33,426 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:33,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2021-11-23 17:00:33,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2045, Invalid=15511, Unknown=0, NotChecked=0, Total=17556 [2021-11-23 17:00:33,428 INFO L87 Difference]: Start difference. First operand 54875 states and 68284 transitions. Second operand has 133 states, 133 states have (on average 4.082706766917293) internal successors, (543), 133 states have internal predecessors, (543), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:54,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:54,933 INFO L93 Difference]: Finished difference Result 70070 states and 86750 transitions. [2021-11-23 17:00:54,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-11-23 17:00:54,934 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 4.082706766917293) internal successors, (543), 133 states have internal predecessors, (543), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2021-11-23 17:00:54,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:55,010 INFO L225 Difference]: With dead ends: 70070 [2021-11-23 17:00:55,010 INFO L226 Difference]: Without dead ends: 60875 [2021-11-23 17:00:55,023 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 758 GetRequests, 582 SyntacticMatches, 4 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11027 ImplicationChecksByTransitivity, 37.3s TimeCoverageRelationStatistics Valid=3446, Invalid=26656, Unknown=0, NotChecked=0, Total=30102 [2021-11-23 17:00:55,023 INFO L933 BasicCegarLoop]: 1577 mSDtfsCounter, 39177 mSDsluCounter, 51101 mSDsCounter, 0 mSdLazyCounter, 1743 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39177 SdHoareTripleChecker+Valid, 52678 SdHoareTripleChecker+Invalid, 2235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 1743 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 417 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:55,024 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39177 Valid, 52678 Invalid, 2235 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [75 Valid, 1743 Invalid, 0 Unknown, 417 Unchecked, 3.4s Time] [2021-11-23 17:00:55,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60875 states. [2021-11-23 17:01:00,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60875 to 54917. [2021-11-23 17:01:00,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54917 states, 54915 states have (on average 1.2444140945096969) internal successors, (68337), 54916 states have internal predecessors, (68337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:00,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54917 states to 54917 states and 68337 transitions. [2021-11-23 17:01:00,150 INFO L78 Accepts]: Start accepts. Automaton has 54917 states and 68337 transitions. Word has length 117 [2021-11-23 17:01:00,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:00,150 INFO L470 AbstractCegarLoop]: Abstraction has 54917 states and 68337 transitions. [2021-11-23 17:01:00,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 4.082706766917293) internal successors, (543), 133 states have internal predecessors, (543), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:00,151 INFO L276 IsEmpty]: Start isEmpty. Operand 54917 states and 68337 transitions. [2021-11-23 17:01:00,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 17:01:00,154 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:00,154 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:01:00,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (107)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:00,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (108)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:00,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:00,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:01:00,755 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:00,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:00,756 INFO L85 PathProgramCache]: Analyzing trace with hash 1017749497, now seen corresponding path program 1 times [2021-11-23 17:01:00,756 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:00,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [530783109] [2021-11-23 17:01:00,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:00,756 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:00,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:00,757 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:00,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (110)] Waiting until timeout for monitored process [2021-11-23 17:01:00,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:00,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:01:00,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:02,268 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 30 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:02,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:03,044 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 45 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:03,044 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:03,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [530783109] [2021-11-23 17:01:03,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [530783109] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:03,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1212470381] [2021-11-23 17:01:03,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:03,044 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:01:03,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:01:03,046 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:01:03,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (111)] Waiting until timeout for monitored process [2021-11-23 17:01:03,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:03,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-23 17:01:03,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:10,613 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 34 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:10,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:15,833 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 23 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:15,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1212470381] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:15,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309736357] [2021-11-23 17:01:15,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:15,834 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:01:15,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:01:15,834 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:01:15,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_39b86ddc-052d-4e3f-989c-edfdd2bca273/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2021-11-23 17:01:15,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:15,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:01:15,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:17,250 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 32 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:17,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:17,704 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 45 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:17,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1309736357] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:17,705 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:01:17,705 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 32, 27, 12, 11] total 82 [2021-11-23 17:01:17,705 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811210450] [2021-11-23 17:01:17,705 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:01:17,706 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-23 17:01:17,706 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:17,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-23 17:01:17,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1001, Invalid=5641, Unknown=0, NotChecked=0, Total=6642 [2021-11-23 17:01:17,707 INFO L87 Difference]: Start difference. First operand 54917 states and 68337 transitions. Second operand has 82 states, 82 states have (on average 5.463414634146342) internal successors, (448), 82 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:02,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:02,434 INFO L93 Difference]: Finished difference Result 172003 states and 212511 transitions. [2021-11-23 17:02:02,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 178 states. [2021-11-23 17:02:02,435 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 5.463414634146342) internal successors, (448), 82 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2021-11-23 17:02:02,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:02,682 INFO L225 Difference]: With dead ends: 172003 [2021-11-23 17:02:02,683 INFO L226 Difference]: Without dead ends: 153242 [2021-11-23 17:02:02,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 703 SyntacticMatches, 17 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19822 ImplicationChecksByTransitivity, 34.4s TimeCoverageRelationStatistics Valid=6062, Invalid=44338, Unknown=0, NotChecked=0, Total=50400 [2021-11-23 17:02:02,735 INFO L933 BasicCegarLoop]: 1728 mSDtfsCounter, 20485 mSDsluCounter, 43424 mSDsCounter, 0 mSdLazyCounter, 1534 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20485 SdHoareTripleChecker+Valid, 45152 SdHoareTripleChecker+Invalid, 4689 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 1534 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 3007 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:02:02,736 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20485 Valid, 45152 Invalid, 4689 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [148 Valid, 1534 Invalid, 0 Unknown, 3007 Unchecked, 3.1s Time] [2021-11-23 17:02:02,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153242 states.